Patent Application
20210280934
The invention relates to an electrical device, in particular an electrical storage device, such as a micro-battery and/or a capacitor.
In the sense of the current invention, batteries are understood to be disposable batteries which are disposed of and/or recycled after their use, as well as accumulators. Accumulators, preferably lithium-ion batteries are intended for various applications, for example for portable electronic equipment, cell phones, power tools and in particular electric vehicles. The batteries can replace traditional energy sources, for example lead-acid batteries, nickel-cadmium batteries, or nickel-metal hydride batteries. Use of batteries in sensors is possible or in internet related devices.
Storage devices in the sense of the current invention are also understood to be capacitors, in particular super capacitors.
Super capacitors, also referred to as super caps are, as generally known, electrochemical energy storage devices having an especially high output density. Super capacitors, in contrast to ceramic-, film- and electrolytic capacitors are not a dielectric in the conventional sense. In particular, they actualize the storage principles of static storage of electric energy by means of charge separation in a double layer capacitance and also the electrochemical storage of electric energy by means of charge exchange with the assistance of a redox reaction in a pseudo capacity.
Super capacitors include hybrid capacitors, especially lithium-ion-capacitors. Their electrolytes are normally a solvent in which conductive salts, normally lithium salts are dissolved. Super capacitors are generally used in applications where a very high number of charge and discharge cycles are required. Super capacitors are used especially advantageously in the automotive sector in particular in the area of recuperation of braking energy. Other applications are obviously also possible and are covered by the current invention.
Lithium-ion batteries as storage devices have been known for many years. In this regard we refer you to the “Handbook of Batteries, published by David Linden, 2nd issue, McGrawhill, 1995, chapter 36 and 39”.
Various aspects of lithium-ion batteries are described in a multitude of patents.
Some examples are: U.S. Pat. Nos. 961,672 A1, 5,952,126 A1, 590,018 A1, 5,874,185 A1, 5,849,434 A1, 5,853,914 A1 as well as U.S. Pat. No. 5,773,959 A1.
Lithium-ion batteries, in particular for applications in the automobile industry generally feature a multitude of individual battery cells which are generally connected in-series. The in-series connected battery cells are usually combined into so-called battery packs and then to a battery module which is also referred to as a lithium-ion battery. Each individual battery cell has electrodes which are led out of a housing of the battery cell. The same applies to the housings of super capacitors.
In particular with the use of lithium-ion batteries in the automotive environment, a multitude of problems such as corrosion resistance, stability in accidents or vibration resistance must be solved. An additional problem is the seal, in particular the hermetic seal over an extended period of time.
The seal may be compromised, by example, by leakage in the region of the electrodes of the battery cell or the electrode feedthrough in the battery cell and/or the housing of capacitors and/or super capacitors. Such leakages may, for example, be caused by temperature change stresses and alternating mechanical stresses, for example, vibrations in the vehicle or an aging of the synthetic material.
A short-circuit or temperature change in the battery or battery cell can lead to a reduced life span of the battery or the battery cell. Equally as important is the impermeability of the seal in accident and/or emergency situations.
In order to ensure better stability in accidents, a housing for a lithium-ion battery is suggested for example in DE 101 05 877 A1, whereby the housing includes a metal jacket which is open on both sides and which is being sealed.
The power connection or respectively the electrode are insulated by plastic material. A disadvantage of the plastic insulations is the limited temperature resistance, the limited mechanical stability, aging and the unreliable dependability of the seal over the service life.
The feedthroughs in the lithium-ion batteries and capacitors according to the current state of the art are therefore not integrated hermetically sealed into the cover part of the lithium-ion battery. Thus, at a pressure difference of 1 bar a maximum helium leakage rate of 1·10−6 mbar 1 s−1 is generally reached at the current state of the art, depending on the test specifications. Moreover, the electrodes are crimped, and laser welded connecting the components with additional insulators arranged in the interior of the battery.
An alkaline battery has become known from DE 27 33 948 A1 wherein an insulator, for example glass or ceramic is joined directly by means of a fusion seal with a metal component.
One of the metal parts is connected electrically with an anode of the alkaline battery and the other is connected electrically with a cathode of the alkaline battery. The metals used in DE 27 33, 948 A1 are iron or steel. Light metals like aluminum are not described in DE 27 33 948 A1. Also, the sealing temperature of the glass or ceramic material is not specified in DE 27 33 948 A1. The alkaline battery described in DE 27 33 948 A1 is a battery with an alkaline electrolyte which, according to DE 27 33 948 A1 contains sodium hydroxide or potassium hydroxide. Li-ion batteries are not mentioned in DE 27 33 948 A1.
A method to produce asymmetrical organic carboxylic acid esters and to produce anhydrous organic electrolytes for alkali-ion batteries has become known from DE 698 04 378 T2 or respectively EP 0885 874 B1. Electrolytes for rechargeable lithium-ion cells are also described in DE 698 04 378 T2 or respectively EP 0 885 874 B1.
Materials for the cell pedestal which receives the through-connection are not described; only materials for the connecting pin which may consist of titanium, aluminum, a nickel alloy or stainless steel.
An RF feedthrough with improved electrical efficiency is described in DE 699 23 805 T2 or respectively EP 0 954 045 B1. The feedthroughs known from DE 699 23 805 T2 or respectively EP 0 954 045 B1 are not glass-metal feedthroughs. Glass-metal feedthroughs which are provided immediately inside for example the metal wall of a packing, are described in EP 0 954 045 B1 as being disadvantageous since RF feedthroughs of this type are not durable due to embrittlement of the glass.
DE 690 230 71 T2 or respectively EP 0 412 655 B1 describes a glass-metal feedthrough for batteries or other electro-chemical cells, whereby glasses having a SiO2 content of approximately 45 weight-% are being used and metals, in particular alloys are being used which contain molybdenum and/or chromium and/or nickel. The use of light metals is also insufficiently addressed in DE 690 230 71 T2, as are sealing temperatures or bonding temperatures for the used glasses. According to DE 690 230 71 T2 or respectively EP 0 412 655 B1 the materials used for the pin-shaped conductor are alloys which contain molybdenum, niobium or tantalum.
A glass-metal feedthrough for lithium-ion batteries has become known from U.S. Pat. No. 7,687,200 A1. According to U.S. Pat. No. 7,687,200 A1 the housing was produced from high-grade steel and the pin-shaped conductor from platinum/iridium. The glass materials cited in U.S. Pat. No. 7,687,200 A1 are glasses TA23 and CABAL-12. According to U.S. Pat. No. 5,015,530 A1 these are CaO—MgO—Al2O3—B2O3 systems having sealing temperatures of 1025° C. or 800° C. Moreover, glass compositions for glass-metal feedthroughs for lithium batteries have become known from U.S. Pat. No. 5,015,530 A1 which contain CaO, Al2O3, —B2O3, SrO and BaO whose sealing temperatures are in the range of 650° C.-750° C. and which are therefore too high for use with light metals.
A feedthrough has become known from U.S. Pat. No. 4,841,101 A1 wherein an essentially pin-shaped conductor is sealed into a metal ring with a glass material. The metal ring is then inserted into an opening or bore in a housing and is joined, in particular in a material-to-material manner with the interior wall or respectively the bore through welding, for example after the interlocking of a welding ring. The metal ring consists of a metal which has essentially the same or similar thermal coefficient of expansion as the glass material in order to compensate for the high thermal coefficient of expansion of the aluminum of the battery housing. In the design variation described in U.S. Pat. No. 4,841,101 A1 the length of the metal ring is always shorter than the bore or opening in the housing.
Feedthroughs, which are passed through a housing part of a housing for a storage device have become known from WO 2012/167921 A1, from WO 2012/110242 A1, from WO 2012/110246 A1 and WO 2012/110244 A1. In the feedthroughs a cross section is passed in a glass or glass ceramic material through the opening.
In DE 27 33 948 A1 a feedthrough is shown through a housing part of a battery, wherein the housing part has at least one opening, wherein the opening includes a conductive material, as well as a glass or glass ceramic material, and wherein the conductive material is designed as a cap-shaped element. No indication is however given in DE 27 33 948 A1 as to which specific material the conductor consists of Also, no indication is provided in DE 27 33 948 A1 as to the wall thickness of the cap-shaped element.
A battery with a feedthrough which has one opening has become known from U.S. Pat. No. 6,190,798 A1 wherein the conductor is a cap-shaped element and is inserted into the opening in an insulating material, which may be glass or a resin. There is also no indication in U.S. Pat. No. 6,190,798 A1 regarding the wall thickness of the cap-shaped element.
US 2015/0364 735 A1 shows a battery with a cap-shaped cover which has areas of reduced thickness as a safety outlet in the case of a pressure overload.
A conical overpressure relief safeguard has become known from WO 2014/176 533 A1. An application for batteries is not described in WO 2014/176 533 A1.
DE 10 2007 063 188 A1 shows a battery with at least one single cell enclosed by a housing and a housing type overpressure relief safeguard in the form of one or several predetermined breaking points or one or several rupture disks.
U.S. Pat. No. 6,433,276 A1 shows a feedthrough wherein the metallic housing part, conductor, and glass material have substantially the same coefficient of expansion.
It is disadvantageous on all electrical devices, in particular on storage devices, according to the current state of the art, that the known electrical devices, in particular the storage devices, are very large and do not include compact housings. This results in large dimensions, particularly large heights in storage devices. Another problem with electrical devices that had conventional feedthroughs was the use of plastic materials for electrical insulation. Thus, Nylon, polyethylene, and polypropylene are described as insulating materials in DE 27 33 948 A1.
It is therefore the objective of the current invention to specify an electrical device, in particular a storage device, whereby the disadvantages of the state of the art are avoided.
The present invention relates to an electrical storage device, and in particular, a compact storage device.
A small housing thickness should preferably be made possible which, in addition to providing compactness also leads to material savings. Moreover, a secure electrical insulation of the conductor, in particular metal pins, are inserted into the feedthrough opening of the housing. It is herein an objective to provide a storage device which in itself is compact to the extent that as much volume as possible is available in the housing interior, resulting in the provision that the battery and/or capacitor can have the highest possible capacity. Thus, the storage device with feedthroughs according to the invention is suitable for micro-batteries. The present invention also relates to hermetically sealed micro-batteries having a feedthrough, as shown in this application.
Typical applications for micro-batteries are, for example, active RFID devices and/or medical devices, such as hearing aids, blood pressure sensors and/or wireless headphones. In this connection, the concept is often used and is thus generally known. Equally of interest are micro-batteries for internet related devices.
According to the present invention, this objective is met by an electrical device, in particular a storage device as claimed below.
The electrical device, in particular the storage device includes a feedthrough having an opening into which a conductor, which is also referred to as a contact element, is glazed.
A disadvantage with solid pins as conductors is the high material usage on the one hand. An additional disadvantage of the pins, designed as a solid component, is their rigid connection with the glass, as well as the fact that, in the case of the housing, they are used in a storage device, taking up a lot of space, whereby space, for example in the housing of the storage device, in the current case in the battery housing is lost. In particular, in the case of a transverse load, which may occur, for example, during a mechanical and/or a pressure load of the storage device the pin formed of solid material presses onto the glass which can lead to the glass breaking or cracks occurring in the glass.
Another disadvantage with storage devices, according to the current state of the art, was that a sealed connection of the feedthrough with the housing of the storage device, for example the battery, was difficult.
The electric device according to the present invention, in particular the electrical storage device or sensor housing, preferably a battery, in particular a micro-battery or a capacitor with a feedthrough through a housing part having a material thickness T of the housing of the device, consisting of a metal. The metal is in particular iron, iron alloys, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, steel, high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy or titanium or a titanium alloy. The housing part has at least one opening, wherein the opening receives a contact element made of a conductive material in a glass or glass ceramic material. The housing part has a collar in the region of the opening and thus forms an inner wall of the feedthrough opening having a height H which is greater than the material thickness T, wherein the glazing length of the glass or glass ceramic material corresponds to height H. The collar is formed preferably by a drawn-up edge of the housing part.
In order to be able to simply raise the collar, the collar is intended to be an upward bulging reshaped collar.
In an especially advantageous embodiment of the present invention, the housing part and the collar are a single component, however, they do not have to be.
Material thickness T of the housing part is preferably 0.1 mm to 0.3 mm. The length of the inner wall, which specifies the glazing length and is identified by H or EL is in the range of 0.3 mm to 1.0 mm, especially 0.3 mm to 0.5 mm and is formed by the drawn-up edge.
The housing of the electrical device has preferably a first thermal coefficient of expansion α1, the glass and/or glass ceramic material has a second thermal coefficient of expansion α2 and/or the conductor has a third thermal coefficient of expansion α3. In particular, the thermal coefficients of expansion α1, α2 and/or α3 vary essentially by 2*10−6 l/K at most, preferably by no more than 1*10−6 l/K, particularly they are substantially the same. The thermal coefficients of expansion α1, α2, α3 are in the range of 3 to 7*10−6 l/K, preferably 4.5 to 5.5*10−6 l/K or in the range of 9*10−6 l/K to 11*10−6 l/K.
In order to avoid a short circuit of the connection with the metal housing or the storage device, for example the battery or the capacitor, it may be provided that an insulating element is arranged on the glass or glass ceramic material, which can be made in particular of a plastic material or glass or glass ceramic material and in particular covers the front face of the collar. Alternatively, to the separate insulating element, a glass material protruding beyond the edge, consisting for example of a foaming glass, may also be provided. The plane of the surface of the collar is positioned preferably below the plane of the surface of the contact element, preferably of the electrical conductor which is fed through the feedthrough. It is particularly preferred that the surface of the insulating element is on one plane with the surface of the contact element or respectively the electric conductor which is inserted into the opening of the feedthrough.
According to the present invention, a feedthrough is also specified which facilitates contacting of a conductor that would provide as much assembly space in the interior of the housing as possible. The feedthrough is hermetically sealed and which, in particular during a mechanical and/or pressure load, in particular in the region between contact and sealing material, offers improved compatibility with the brittle sealing material. The feedthrough of the electrical device, in particular the battery finds application in a housing component, for example in a battery and/or capacitor cover for an electrical device. The expansion of the assembly space contributes, in particular to increasing the capacity of the storage device.
According to the present invention, the feedthrough, in particular through a housing part of the housing wherein the housing part has at least one opening, has a conductive material as well as a glass or glass ceramic material as an electrically insulating sealing material. The conductive material is inserted into the glass or glass ceramic material and in one embodiment is not a solid component, in particular not a solid pin shaped conductor, but simply a cap-shaped element. Preferred materials for the cap-shaped element are KOVAR, titanium, titanium alloys, steel, stainless steel or high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium as well as a magnesium alloy. In this embodiment a cap-shaped element is used as a conductor instead of a solid conductor.
The design as a cap-shaped element, which is inserted into the glass or glass ceramic material as a conductor, has the advantage that, on the basis of the comparatively thin side walls of the cap-shaped element, the combination of the cap-shaped element with the glass or glass ceramic material is more resistant to mechanical transverse loads, which occur during thermal stresses, but also during pressure loads in the interior of the housing. On the basis of its elasticity the cap-shaped element can thus compensate for transverse loads so that pressure onto the glass or the glass ceramic material and avoid failure of the sealing material. Moreover, on the basis of such a design, substantial material savings are achieved as compared to a solid pin. Due to the design as a cap-shaped element, additional assembly space is created inside the housing, for example the battery housing. This facilitates larger surfaces of the cap-shaped conductor and thereby the connecting area, and at the same time providing a larger available assembly space. With the design according to the present invention higher thermal resistance is also achieved compared to a feedthrough design with a solid pin. In addition, the housing assembly space is increased since conductor contacting occurs in the cap-shaped element. This makes it possible to achieve a higher battery output density at increased overall volume with the same outside dimensions. It is especially preferred if the thickness and/or wall thickness of the cap-shaped element is in the range of 0.1 mm to 0.3 mm. Such a thinly designed cap element has many advantages. If cap-shaped elements with a connection surface and side walls that are thin, have a wall thickness outside the base stamping of the cap in the region of 1.1 mm to 0.3 mm they have the advantage that, in contrast to solid pins, they can absorb transverse loads, in the event of thermal stresses. Furthermore, the thin metal, in contrast to a massive one, can yield flexibly resiliently, thus avoiding damage to the glass material.
The cap-shaped element has a connecting surface and side walls, in particular thin side walls, as well as a hollow space in the cap.
According to the present invention the cap-shaped element can be produced in the form of a drawn component. The drawn component is preferably produced by deep drawing. Deep drawing is a tensile-compression forming process and a most important sheet metal forming process, which is widely used in mass production. Deep drawing is achieved with the assistance of forming tools, impact devices and impact energy. The thereby produced cap-shaped element is especially advantageously a one-piece component.
Due to mass production the cap produced by deep drawing is cost effective, material saving and efficiently producible.
In order to electrically and/or mechanically connect a conductor with the cap-shaped element provision is made that the cap includes a tongue, which is notably connected with the connecting surface and/or the side wall facing the hollow space in the cap. In an especially preferred embodiment it is possible that the hollow space in the cap of the cap-shaped element serves to accommodate sensor devices, for example temperature and/or pressure gauges. The temperature and/or pressure gauges can be a part of safety devices.
It is moreover advantageous if the cap-shaped element has at least one base stamping, especially for pressure release. The material thickness is reduced in the region of the base stamping; the wall thickness of the cap is thus less in the area of the base stamping than in the remaining regions. Under load the base stamping acts as a predetermined breaking point. The base stamping can be introduced in the side of the cap-shaped element that is facing toward, or away from, the hollow space in the cap. Combinations of this arrangement are also conceivable and are included in the invention. By means of the base stamping, a safety valve and/or a safety outlet is created. In the sense of this description, the term “safety valve” also encompasses the concept of a safety outlet. On the basis of the selection of the remaining wall thickness in the region of the base stamping it can be preset at what load, in particular at what pressure, the safety valve is triggered. With a greater remaining wall thickness, an activation occurs at high pressures, and with a small remaining wall thickness an activation occurs at very low pressures. With the related thin sheet metals, the wall strength or thickness of the cap in the region outside the base stamping is advantageously in the range of 0.1 mm to 0.3 mm. Based on the reduced thickness, in the area of the base stamping, the cover opens very quicky on the basis of pressure loads, in particular in an overload event, so that the cap-shaped element acts as a safety valve. The thickness of the cap, in the region of the base stamping, that is the remaining wall thickness or remaining material strength is preferably in the range of 10 μm to 50 μm, depending upon at which pressure the safety valve should be triggered. Accordingly, the base stamping is a safety release in the event of a pressure overload.
Alternatively, to the design of the base stamping as a safety valve, it is also conceivable to design the side walls of the caps in such a way, for example conically, such that, in the event of failure of the battery and/or the capacitor they lead to a pressure release. Based on the size of the cone it is possible to specify at what pressure the cone opens. It generally applies that, if the cone becomes larger in the direction of the opening, the opening pressure becomes less, and vice versa.
The existence of the safety valve has the advantage that in the event of an activation, the pressure can escape at a defined location. On the other hand the housing may tear open over a large area and/or explode, thus endangering people or objects in the vicinity due to shrapnel impact.
It is also possible that, due to reshaping, in particular deep drawing, the cap-shaped element experiences a weakening in the transitional region between the connecting surface and the side wall, so that, in the event of an overload, a tear occurs in this transitional region so that a controlled pressure release, with reduced hazard potential is facilitated.
The cap-shaped element is preferably designed to be ring-shaped with a diameter preferably in the range of 1.5 mm to 5 mm, in particular 2.0 mm to 4.00 mm.
The current feedthrough is preferably a so-called matched feedthrough. This means that the thermal coefficient of expansion of the housing (α1) and of the glass and/or glass ceramic material (α2) as well as that of the cap-shaped element (α3) is substantially the same. When using KOVAR, nickel-iron-cobalt alloys, for example, NiCo 2918 with a share of 29% Ni and 18% Co the thermal coefficient of expansion is in the range of 3 to 7*10−6 l/K, preferably 4.5 to 5.5*10−6 l/K. Alternative materials are iron, iron alloys, iron-nickel alloys, iron-nickel-cobalt alloys, steel, stainless steel, high-grade steel, titanium, titanium alloys, aluminum, aluminum alloys, AlSiC, magnesium, or magnesium alloys.
The present invention moreover provides a feedthrough, in particular through a housing part of a housing, in particular a storage device, preferably a battery or a capacitor made of a metal, in particular iron, iron alloys, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, steel, stainless steel, high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy. The housing part has at least one opening, wherein the opening accommodates a conductive material, preferably a conductor in a glass or glass ceramic material, characterized in that the housing part is drawn upward, so that an opening with a drawn-up edge is created. A collar is created by means of the drawn-up edge.
The drawn-up edge then provides a glazing length. The glazing length is herein identified with EL or H. The drawn-up edge can correspond exactly with the glazing length or may be reduced compared to the glazing length. It is also possible that the drawn-up edge is greater than the glazing length. The glazing length is for example 0.3 mm to 1.0 mm, preferably approximately 0.6 mm.
It is especially preferred if the thermal coefficient of expansion of the conductor, glass and housing is approximately the same. It is particularly preferred if the thermal coefficient of expansion of the conductor (αconductor), glass (αglass), and housing (αhousing) is in the range of 9 ppm/K to 11 ppm/K.
In one preferred embodiment the raised edge includes a flexible flange or connects to a flexible flange.
The flexible flange includes a connecting region which serves to connect the feedthrough with the conductor, which is glazed in the glass or glass ceramic material with the housing, for example the housing of the storage device. Connecting the feedthrough with the housing can be accomplished through welding, in particular laser welding, but also soldering. The connection, for example, by means of welding is such that the He leakage rate is less than 1·10−8 mbar l/s. The He-leakage rate herein is identical to that of the glazed in conductor and thus, a hermetically sealed housing is provided for a storage device, in particular a battery.
Based on the free space at the flexible flange that is created between the raised edge, which provides glazing length EL or H and the connecting region, pressures acting upon the glass material can be reliably compensated. The flexibility of the flange prevents, for example during temperature fluctuations, a breaking of the glass or compensates for the tensile stresses and compressive stresses due to welding.
In addition to the feedthrough a housing with a feedthrough of this type is also provided, as well as an electrical storage device, in particular a battery or a capacitor with a housing of this type.
The housing is in particular a housing for an electrical storage device which can be a battery as well as a capacitor. The present invention moreover also claims a storage device, in particular a battery or a capacitor with such a housing with feedthrough. A micro-battery may in particular also be used as electrical storage device.
Especially compact electrical storage devices are provided, if the electrical storage device has a total height not exceeding 5 mm, in particular not exceeding 4 mm, preferably not exceeding 3 mm, in particular in the range of 1 mm to 5 mm, preferably 1 mm to 3 mm, as is the case with micro-batteries.
It is especially preferred if the material of the storage device, at least for the housing region which is in contact with the inorganic material, in particular the glass or glass ceramic material, is a metal. The metal being iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, Kovar, steel, stainless steel, high-grade steel, ferritic high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy. In addition to the ferritic high-grade steel, KOVAR is also a possible material for a feedthrough according to the invention.
To avoid negative impacts of temperature effects such as glass breakage it is advantageous if the raised edge has a flexible flange for connection of the feedthrough to a housing, for example a battery housing.
The flange itself includes a region, a so-called connecting region, with which the feedthrough is connected to the housing part. The connection can occur through welding, in particular ultrasonic welding or soldering.
The connection between the flange and the battery housing is preferably a largely tight connection, in other words, the He leakage rate is less than 1·10−8 mbar l/s at a pressure difference of 1 bar.
Instead of the separate insulating elements it may be provided for a feedthrough through a housing part of a housing with a feedthrough opening, which accommodates a conductor, that an inorganic material, in particular a glass or glass ceramic material is used as an electrically insulating sealing material. The inorganic material, in particular the glass or glass ceramic material covers at least one area of a partial surface of the housing component. Instead of the sealing material, which is electrically insulating, a separate insulating element can also cover the area of the partial surface of the housing part.
Besides the metal pin, a cap can also be used as a conductor.
In addition, it may be provided that one plane of the housing region is arranged on the surface facing away from the housing interior outside the feedthrough opening above or below, with an offset to a plane which is formed by the surface of the conductor facing away from the housing interior. The offset describes the distance of the surface of the conductor, which is glazed into the feedthrough opening, from the surface of the upward drawn edge of the housing component and thereby the thickness of the necessary insulating glass layer, which is applied to the drawn-up edge, either directly or in the form of a separate insulating element.
The thickness of this insulating layer is preferably identical to the height of the offset and is in the range of 0.1 mm to 1.0 mm, preferably 0.1 mm to 0.7 mm, in particular 0.1 mm to 0.2 mm.
Preferred material for the conductor and/or the housing are metal, in particular iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, KOVAR, titanium, a titanium alloy, steel, stainless steel or high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium and a magnesium alloy. In particular high-grade steel and in this case ferritic high-grade steel are preferred due to the excellent adhesion of the glass or glass ceramic material. An additional advantage is that the coefficient of expansion a of the ferritic high-grade steel is in the range of 9 to 11 ppm/K which corresponds to the coefficients of expansion of the glass material which is being used.
If a cap-shaped element is used as the conductor in place of a solid pin, this has the advantage that, due to the comparatively thin side walls of the cap-shaped element, the combination of the cap-shaped element with the glass or glass ceramic material, is more resistant in regard to transverse loads, which occur in the event of thermal stresses, but also with compressive stresses inside the housing. The cap-shaped element can compensate for transverse loads due to its elasticity so that a pressure upon the glass or glass ceramic material and an associated failure of the sealing material is avoided. In addition, substantial material savings are achieved with such an arrangement compared to a solid pin. On the basis of the design as a cap-shaped element additional space is created in the housing, for example the battery housing. In particular, this makes larger surfaces of the cap-shaped conductor and thus of the connecting region possible and at the same time provides enlarged available assembly space. By using a cap-shaped element a higher thermal resistance is achieved in contrast to a design of a feedthrough with a solid pin. In addition, the housing assembly space is increased since conductor contacting can occur in the cap-shaped element. It is thus possible to achieve a higher battery output density at an increased overall volume with the same outside dimensions.
The cap-shaped element can in particular also be manufactured in the embodiment of a drawn component. The drawn component is preferably produced by deep drawing. Deep drawing is a tensile-compression forming process and a most important sheet metal forming process which is widely used in mass production. Deep drawing is achieved with the assistance of forming tools, impact devices and energy. The thereby produced cap-shaped element is especially advantageously a one-piece component.
Due to mass production the cap produced by deep drawing is especially cost effective, material saving and efficiently producible.
An especially compact housing for an electrical storage device is provided, if in a feedthrough the partial surface of the housing component, that is covered by an inorganic material, in particular a glass or glass ceramic material, has a wall thickness wherein the wall thickness is less than 1 mm, preferably less than 0.7 mm, in particular less than 0.5 mm and especially preferably less than 0.3 mm, in particular less than 0.2 mm, particularly preferably less than 0.1 mm. Especially preferred is a wall thickness in the range of 0.02 mm to 1 mm, in particular in the range of 0.02 mm to 0.1 mm.
In order to minimize the pressure on the side walls of the feedthrough having the thin wall thicknesses it is advantageously provided, that the housing component has a first coefficient of expansion arousing, the conductor, in particular the metal pin, preferably the contact pin has a second coefficient of expansion αpin and the glass or glass ceramic material has a third coefficient of expansion αglass and that the difference of first, second and third coefficient of expansion is 2 ppm/K maximum, preferably 1 ppm/K maximum. In a case like this we have a matched feedthrough.
It is especially preferred if the first, second and third coefficients of expansion (αpin, αglass, αhousing) are in the range of 9 ppm/K to 11 ppm/K.
The glass or glass ceramic material can also include fillers, which serve in particular to control the thermal expansion of the glass or glass ceramic material, in order to achieve an especially well-matched feedthrough.
To provide a wall for the inorganic material, in particular the glass or glass ceramic material, the housing component is raised or lowered in the region of the feedthrough opening. In this manner, a wall is provided in the region of the feedthrough into which a conductor can be glazed.
To facilitate such a glazing it is provided that the housing component outside the raised or lowered region, or respectively the drawn-up or drawn down region, has a first plane. The raised or lowered region is located in a second plane, and that the first plane is angled toward the second plane, in particular vertically angled. With a vertical angulation, that is, the raised or lower region is positioned perpendicular on the first plane of the housing component, an especially stable glazing of the conductor is possible, since in this way, the contact surface between insulator and housing component is enlarged. By raising or lowering the housing cover with assistance of bending or reshaping of the thin housing material the necessary length is provided for reliable glazing. Glazing length EL is preferably 0.3 mm to 1.0 mm, preferably approximately 0.6 mm. The drawn-up or lowered region provides the edge for the collar of the feedthrough. In particular, the plane of the housing region is arranged on the surface facing away from the housing interior outside the feedthrough opening above or below, with an offset to the plane which is formed by the surface of the contact pin facing away from the housing interior, wherein the offset is no more than 1 mm, preferably no more than 0.7 mm, and is in particular in the range of 0.1 mm to 1 mm. Such an offset ensures on the one hand secure electrical insulating of the conductor from the metallic housing, and on the other hand a compact design. A short circuit is thus safely avoided, in particular if contacting occurs from the outside. A storage device with this type of feedthrough can moreover be designed to be very flat in spite of the necessary glazing length of, for example, approximately 0.6 mm.
By means of the glass or glass ceramic material, the conductor is inserted and hermetically sealed into the feedthrough opening. Hermetically sealed is understood to have a He leakage rate of 1*10−8 mbar l/s at a pressure difference of 1 bar.
To insulate, in particular electrically insulate the glazing opening, which is formed by the raised region, it is provided that the glass or glass ceramic material covers an end surface of the raised or lowered region. Instead of protruding glass material stemming from the glazing, a separate glass ring, that is an insulating element, can also be provided.
To improve the adhesion of the glass or glass ceramic material and to ensure in the case of swelling glass or glass ceramic material that same can expand it is provided that the raised or lowered housing component includes openings and/or recesses.
Whereas the openings also serve to tolerate an expansion of the glass material, the recesses serve to improve the glass adhesion. The recesses can be introduced into the metal in various ways. A pattern may be embossed into the metal prior to bending which provides the raised or lowered region and into which the conductor is then glazed. In particular the surface, which is in contact with the glass is being enlarged by introducing recesses, which improves the glass adhesion.
To provide even better interconnecting of the glass or glass ceramic material in the region of the feedthrough opening, provisions are made that the wall of the raised or lowered region includes openings and/or recesses with a diameter and that the diameter decreases or increases in the progression of the raised or lowered region. By such progression of the diameters of the openings, interconnection and thereby better glass adhesion is achieved.
To cover the partial surface of the housing, according to the invention, with the inorganic material, in particular the glass or glass ceramic material, in the region of the raised or lowered region, a swelling glass or glass ceramic is used. The swelling glass or glass ceramic includes pores in its volume area, in particular bubble-shaped pores. In its surface region the swelling glass may, in contrast, create an unbroken surface, in particular a glass or glass ceramic skin at the boundary surface with the air. The porous glass material is obtained by adding a certain amount of a gas, which dissolves in the glass which, however, is outgassed during heating of the glass, so that the pores remain in the glass.
The preferred glass or glass ceramic material is alumoborate glass with the following main components: Al2O3, B2O3, BaO and SiO2. The coefficient of expansion of such a glass material is preferably in the range of 9.0 to 9.5 ppm/K or respectively 9.0 to 9.5 10−6/K and thus in the range of the coefficient of expansion of the metal that the housing is made of and/or the metal pin. The aforementioned coefficient of expansion is especially advantageous in the use of high-grade steel, in particular ferritic or austenitic high-grade steel or Duplex high-grade steel. Because of a similar coefficient of expansion of the high-grade steel to that of the alumoborate glass, a matched feedthrough is provided in such a case.
It is especially preferred if the share of pores in the volume of the inorganic glass or glass ceramic material is in the range of 10 volume-% to 45 volume-%, preferably 18 volume-% to 42 volume-%. The share of pores prevent the glass material, which is inserted in the opening, from breaking under stress upon the glazed conductor, especially under compressive stress. Breaking of the glass under compressive stress is due to the fact that the glass adheres very well on the wall, which is created by the raised or lowered region. Part of the glass material then breaks out of the opening under compressive stress.
In order to reach good adhesion and/or impermeability the glass or glass ceramic material forms a glass-metal bond with the end face of the raised or lowered region of the housing region, the bond being free of pores, at least in the outside circumferential region of the raised or lowered region.
The surface of the glass or glass ceramic material is positioned advantageously on the surface facing away from the interior of the housing in a plane with the surface of the conductor. In order to securely hold the conductor in the glass material the conductor, in particular the metal pin, preferably the contact pin, in particular also the cap-shaped element, includes an indentation.
An even more secure retention of the conductor in the glass material is achieved when the raised or lowered region progresses in such a way that a constriction is created. The raised or lowered region of the housing part, in particular the battery cover, provides the necessary glazing length EL or H for glazing. To avoid breakage of the glass or glass ceramic material after glazing, for example due to temperature effects, it is advantageous if the raised or lowered region includes a flexible flange to connect the feedthrough with the housing, for example a battery housing. The flange itself includes a region, a so-called connecting region with which the feedthrough is connected to the housing part. Connection can occur by means of welding, in particular ultrasonic welding or soldering.
The connection between flange and battery housing is preferably impermeable, that is, the He leakage rate is less than 1·10−8 mbar l/s at 1 bar pressure difference.
Besides the feedthrough the invention also provides an electrical storage device, in particular a battery or capacitor, having at least one feedthrough according to the present invention. As already described, the invention also includes in particular a micro-battery.
Especially compact electrical storage devices are provided if the electrical storage device having a total height not exceeding 5 mm, in particular not exceeding 4 mm, preferably not exceeding 3 mm, in particular in the range of 1 mm to 5 mm, preferably 1 mm to 3 mm.
It is especially preferred if the material of the storage device—at least for the housing region which is in contact with the inorganic material, in particular the glass or glass ceramic material—is a metal, in particular iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, Kovar, steel, stainless steel, high-grade steel, ferritic high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy. In addition to the ferritic high-grade steel, KOVAR is also a possible material for a feedthrough according to the invention.
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
Referring now to the drawings, and more particularly to
The substantially circular opening with an edge has a diameter which is identified with D2 in
Like the opening, cap-shaped element 3 in this embodiment is also essentially round and has a diameter D1. As shown in
Thin side walls 10 of cap-shaped element 3 whose thickness is coordinated with the thickness of cover 1—preferably a thickness in the range of 0.1 to 0.3 mm—have the advantage that, in contrast to solid pins, they can absorb mechanical transverse loads which occur under thermal stresses. Thus, in contrast to a solid pin the comparatively thin metal yields under transverse loads, especially advantageously in a flexibly resilient manner, whereas a solid pin presses onto the glass where it can result in damage. Another reduction in the load upon the glass is preferably achieved in that all components, namely the housing part with the opening, the glass material and the cap-shaped element 3 have substantially the same thermal coefficient of expansion, namely in the range of 3 to 7*10−6 l/K.
Preferred materials for cap 3 are KOVAR, nickel-iron-cobalt alloys but also iron, iron alloys, iron-nickel alloys, iron-nickel-cobalt alloys, titanium, titanium alloys, steel, stainless steel, high-grade steel, magnesium, magnesium alloys, aluminum, aluminum alloys, or AlSiC.
Also clearly shown in
It is especially preferred if contacting of a conductor occurs in the interior of the housing with cap 3 via tongues, which are two-dimensionally connected in particular with cap 3 in the region of the hollow space of cap 3. Contacting by means of tongues has the advantage over contacting by means of a pin, in that the contact areas are larger, along with which there is a lesser contact resistance. The connection with tongues can furthermore be permanently more resistant to shear stresses.
In the illustrated embodiment cap 3 is preferably round with a diameter D1. Diameter D1 of cap 3 is in the range of, for example 1.5 mm to 5 mm, and preferably between 2.0 mm and 4.0 mm. Exemplary diameter D2 of the opening is substantially larger and is in the range of between 8 mm and 4.0 mm, in particular around 5 mm. Glazing length H of the inventive cap 3 in the opening is preferably between 0.4 mm and 1 mm, preferably 0.6 mm. All stated dimensions are exemplary and do not represent a limitation.
Also shown in
The material thickness in the region of stamping 50 is greatly reduced and is preferably in the μm range, depending on the requirements regarding at what pressure a pressure release is to occur. Exemplary material strengths, that is the thicknesses of the metal 40 in the region of stamping 50 are in the range of 10 μm to 50 μm as used in this embodiment, however, without restriction thereto. The material thicknesses in the region of stamping 50 are thus the remaining material thicknesses.
Insulating material 200 consisting in particular of plastic or glass or ceramic is arranged on glass or glass ceramic material 2 and covers in particular the front face of collar 100 or respectively of the drawn-up region. The collar is thus electrically insulated from the conductor 3. The plane of the surface of collar 100 is preferably located below the plane of the surface of contact element 3 or respectively conductor 3. It is especially preferred if the surface of insulating element 200 is located in one plane with the surface of the contact element or respectively the conductor, in this case cap-shaped element 3.
Instead of solid conductor 400 a cap-shaped element, as shown in
The flange is hereby reduced in its thickness, in other words made thinner and has then better elasticity in particular for laser welding, which again provides better impermeability.
An arrangement is shown in
In particular, any tensile or compressive stress, which occurs, for example with laser welding, is avoided due to the flexibility of flange 310. Thus, tensile and compressive tensions can be deflected from the welded cap to the ring. Same components as in
In contrast to a solid plate as used in the current state of the art which, based on its thickness provides the necessary glazing length, an especially thin and thus compact housing part with a feedthrough opening having a sufficient glazing length EL or H of preferably 0.3 mm to 1 mm, preferably approximately 0.6 mm is provided with the inventive arrangement with a relatively thin housing component and raised or lowered regions which are for example created by reshaping. The diameter of opening 1005 is between 2 mm and 5 mm, in particular 2.5 mm to 4 mm.
In addition, also illustrated in the drawing is metal pin 1010 which is inserted in feedthrough opening 1005 and which, in the current example is in the embodiment of a solid pin. Instead of solid metal pin 1010, the conductor may also consist of a cap-shaped element (not illustrated). The cap-shaped element compared to the solid metal pin has the advantage that it is also manufactured from a comparatively thin metal which yields in the event of a transverse load, especially advantageously in a flexibly resilient manner, whereas, in contrast a solid metal pin presses on the glass where it can cause damage.
The invention provides that the conductor, in particular metal pin 1010 is glazed into the feedthrough opening which is created by the raised or lowered region 1003 of the metal, preferably in an inorganic material, in particular in a glass or a glass ceramic material. The glass or glass ceramic material of the glazing is identified with reference number 1020 in the current example. According to the present invention it is provided that the inorganic material, in particular the glass or glass ceramic material covers a partial area of the housing component outside wall 1004, which supports the glazing. This protruding section of the glass that covers the housing component or respectively the battery cover is identified in the current example with reference number 1050. The fact that the glazing covers end 1052 of the raised region with a glass or glass ceramic material ensures that metal pin 1010 is electrically insulated from the housing component that is also made of metal. Instead of the glass material protruding over the edge of the raised region, an insulation can also be provided by a separate insulating material, as shown in
The glass that is used is a swelling glass with a share of bubbles or pores in the glass. This applies especially to the volume range. The share of bubbles or respectively a pore share is preferably 18 to 42 weight percent. To create the bubbles or respectively pores 1101, gas is added to the glass, which is outgassed again during melting and results in pores 1101. The glass ceramic material is alumoborate glass with the following main components: Al2O3, B2O3, BaO and SiO2. The coefficient of expansion of the glass material is in the range αglass of 9.0 to 9.5*10−6/K.
The preferred materials for the housing component as well as for the conductor in the embodiment of a metal pin are iron, an iron alloy, an iron-nickel alloy, an iron-nickel-cobalt alloy, Kovar, steel, stainless steel, high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy. It is especially preferred if the material of the housing component, as well as of the conductor, is a high-grade steel, in particular an alloyed high-grade steel according to EN 10020, preferably a high-grade steel containing chromium, in particular a high-grade steel selected from the group of ferritic high-grade steels and/or hardened high-grade steels. It is especially preferred if AISI446 or AISI430 are used as the ferritic high-grade steel materials. The metal pins used as the conductor are made of a ferritic high-grade steel and can be furnished with a nickel and/or gold cover, so that easy contacting is provided. The chromium content of the ferritic high-grade steels is in the range of 10 weight percent chromium to 30 weight percent chromium. The thermal coefficient of expansion is preferably in the range of 9.0 to 10.0 ppm/K, for example for high-grade steel AISI443 at 9.9*10−6/K.
Based on the thin component thickness of the component housing, it is preferred that the feedthrough is not a compression seal with different coefficients of expansion for the pin material, the glass material and the housing material, but that the coefficients of expansion are substantially the same and that the feedthrough is a matched feedthrough. This means that αglass αpin αhousing show a difference in their coefficients of expansion which is maximally 2 ppm/K, preferably maximally 1 ppm/K. Based on the coefficient of expansion for the pin material αpin of 9.9 ppm/K or respectively 9.9*10−6/K for ferritic high-grade steel AISI443 it is advantageous if the alumoborate glass has a coefficient of expansion of 9.1 ppm/K or respectively 9.1*10−6/K. The thin housing material is selected in regard to the coefficient of expansion to be approximately the same as that of the glass and material of the conductor. The material of the housing component is preferably also a ferritic high-grade steel, for example AISI443. However, the material of the housing is in no way restricted thereto. Other materials as specified in the application are also possible if the coefficient of expansion does not differ greatly from that of the glass and conductor material.
As illustrated in
To improve adhesion for the glass material in feedthrough opening 1005 provision can be made that the material, in particular the metal that provides the inside wall of the feedthrough opening includes recesses and/or openings, as illustrated in
An additional improvement in the adhesion can be achieved if the conductor, in particular the metal pin, preferably the contact pin, but also the cap-shaped element has an indentation which is not illustrated in the current example. Whereas the glass has a share of 18-42% of pores in the feedthrough opening, the glass or glass ceramic material is largely pore-free at the faces 1052 of the raised or lowered region which identified with 1003. The glass or glass ceramic material which has pores 1101 in the volume region thus forms a pore-free unbroken surface in its surface area, in particular a glass or glass ceramic skin which coats the housing component in particular on the boundary surface to the air.
An embodiment is shown in
In
On the basis of the compact feedthrough, the height of the entire micro-battery is at most 5 mm, preferably at most 3 mm, in particular it is in the range of 1 mm to 5 mm. The dimensions in the region of the feedthrough with the flexible flange according to
The feedthrough according to the invention is used for housings for electrical storage devices, in particular batteries of capacitors. On the basis of the very flat inventive feedthrough for an electrical storage device an electrical storage device can be provided having a total height of at most 5 mm, in particular at most 4 mm, preferably at most 3 mm, in particular in the range of 1 mm to 5 mm, preferably 1 mm to 3 mm.
Thus, a very flat feedthrough is specified for the first time, which allows for very compact components with electrical storage devices, in particular batteries or capacitors.
In addition, a feedthrough or respectively an electrical device is provided, in particular a storage device which is characterized by greater stability in regard to mechanical and/or pressure related transverse loads. The inventive feedthrough moreover has the advantage that it can be produced efficiently, that it offers an increased inside housing volume and thus greater battery or capacitor capacities and at the same time contributes to weight reduction due to reduced material use.
In addition the feedthrough can be designed in such a manner that the cap provides a safety function, in particular in regard to the battery or capacitor internal pressure.
In an alternative embodiment of the invention a feedthrough for a housing component or respectively a housing component is provided which includes a flange and which is characterized in that the feedthrough, or respectively the housing component can be tightly sealed with the housing, for example a storage device and it absorbs tensile and compressive stresses.
The invention comprises aspects which are recorded in the following propositions, which are part of the description, but which are not claims
1. Feedthrough, in particular through a housing part (1) of a housing, in particular a storage device, preferably a battery or a capacitor, consisting of metal, in particular iron, iron alloys, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, steel, stainless steel, high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy, wherein the housing part has at least one opening, wherein the opening receives a conductive material in a glass or glass ceramic material (2), characterized in that
2. Feedthrough according to proposition 1,
3. Feedthrough according to one of the propositions 1 to 2,
4. Feedthrough according to one of the propositions 1 to 3,
5. Feedthrough according to proposition 3,
6. Feedthrough according to one of the propositions 1 to 5,
7. Feedthrough according to one of the propositions 1 to 6,
8. Feedthrough according to one of the propositions 1 to 7,
9. Feedthrough according to one of the propositions 1 to 8,
10. A housing, in particular a housing for an electrical storage device, in particular a battery or capacitor having a feedthrough according to one of the propositions 1 to 9.
11. A storage device, in particular a battery or capacitor with a housing or housing part according to proposition 10.
12. A feedthrough, in particular through a housing part (1001) of a housing, in particular of a housing, in particular a storage device, preferably a battery or a capacitor, made of metal, in particular iron, iron alloy, iron-nickel alloy, iron-nickel-cobalt alloy, KOVAR, steel, stainless steel, high-grade steel, aluminum, an aluminum alloy, AlSiC, magnesium, a magnesium alloy, titanium or a titanium alloy, wherein the housing part has at least one opening, wherein the opening receives a conductive material, preferably a conductor in a glass or glass ceramic material,
13. Feedthrough according to proposition 12,
14. Feedthrough according to one of the propositions 12 to 13,
15. Feedthrough according to one of the propositions 12 to 14,
16. Feedthrough according to one of the propositions 12 to 14,
17. Feedthrough according to one of the propositions 12 to 16,
18. Feedthrough according to one of the propositions 12 to 17,
19. Feedthrough according to one of the propositions 12 to 18,
20. Feedthrough according to one of the propositions 12 to 19,
21. Feedthrough according to one of the propositions 12 to 20,
22. Feedthrough according to one of the propositions 12 to 21,
23. Housing, in particular a housing for an electrical storage device, in particular a battery or capacitor with a feedthrough according one of the propositions 12 to 22.
24. Storage device, in particular a battery or capacitor, with a housing or housing part according to proposition 23.
25. Storage device, in particular electrical storage device according to proposition 24,
26. Electrical storage device according to one of the propositions 24 to 25,
27. Electrical storage device according to one of the propositions 24 to 26,
28. Electrical storage device according to proposition 27,
29. Electrical storage device according to proposition 28,
30. Feedthrough (1001) through a housing component (1002), preferably an annular housing component with a feedthrough opening (1005) of an electrical storage device, preferably a battery or a capacitor, with at least one conductor (1010), in particular a metal pin, preferably a contact pin, in particular preferably a cap-shaped element which, by means of an inorganic material, in particular a glass or glass ceramic material (1020) is insulated in the housing feedthrough opening (1005), preferably electrically insulated from the housing component,
31. Feedthrough according to proposition 30,
32. Feedthrough according to one of the proposition 30 or 31,
33. Feedthrough according to one of the propositions 30 to 32,
34. Feedthrough according to one of the proposition 30 to 33,
35. Feedthrough according to one of the proposition 30 to 34,
36. Feedthrough according to one of the proposition 30 to 35,
37. Feedthrough according to one of the proposition 30 to 36,
38. Feedthrough according to one of the proposition 30 to 37,
39. Feedthrough according to one of the proposition 30 to 38,
40. Feedthrough according to proposition 39,
41. Feedthrough according to one of the proposition 30 to 40,
42. Feedthrough according to proposition 41,
43. Feedthrough according to one of the proposition 30 to 42,
44. Feedthrough according to one of the proposition 30 to 43,
45. Feedthrough according to one of the proposition 30 to 44,
46. Feedthrough according to one of the proposition 30 to 45,
47. Feedthrough according to one of the proposition 30 to 46,
48. Feedthrough according to one of the proposition 30 to 47,
49. Feedthrough according to proposition 48,
50. Electrical storage device, in particular a battery or capacitor, in particular a micro-battery, comprising at least one feedthrough according to one of the propositions 30 to 49.
51. Electrical storage device according to proposition 50,
52. Electrical storage device according to one of the propositions 50 to 51,
53. Electrical storage device according to one of the propositions 50 to 52,
54. Electrical storage device according to proposition 53,
55. Electrical storage device according to one of the propositions 50 to 54,
56. Electrical storage device according to proposition 55,
57. Electrical storage device according to proposition 56,
58. Electrical storage device according to one of the propositions 50 to 57,
While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2018 220 118.8 | Nov 2018 | DE | national |
| 10 2019 213 901.9 | Sep 2019 | DE | national |
| 19000469.7 | Oct 2019 | EP | regional |
This is a continuation of PCT application no. PCT/EP2019/082032, entitled “ELECTRICAL FEEDTHROUGH GLASS-METAL ELECTRODES”, filed Nov. 21, 2019, which is incorporated herein by reference. PCT application no. PCT/EP2019/082032 claims the priority of German patent application no. 10 2018 220 118.8 entitled “ELECTRICAL FEEDTHROUGH GLASS-METAL ELECTRODES”, filed on Nov. 23, 2018, which is incorporated herein by reference. PCT application no. PCT/EP2019/082032 claims the priority of German patent application no. 10 2019 213 901.9 entitled “ELECTRICAL FEEDTHROUGH GLASS-METAL ELECTRODES”, filed on Sep. 19, 2019, which is incorporated herein by reference. PCT application no. PCT/EP2019/082032 claims the priority of European patent application no. 19000469.7 entitled “ELECTRICAL FEEDTHROUGH GLASS-METAL ELECTRODES”, filed on Oct. 15, 2019, which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2019/082032 | Nov 2019 | US |
| Child | 17328746 | US |
