Patent Application
20240120625
Embodiments of the present disclosure generally relate to the field of power control circuits, and more particularly, to a cylindrical battery cell, a battery and a method for forming cylindrical battery cell.
A battery (such as an automotive battery) in general includes a plurality of battery cell. As a kind of battery cell, a cylindrical battery cell is used recently. For example, formfactors of the cylindrical battery cell may be from 21700 (diameter is 21 mm and height is 70 mm) to 50120 (diameter is 50 mm and height is 120 mm), and the cylindrical battery may include a jellyroll structure.
In general, the cylindrical battery cell exceeding 21700 formfactor need to have a special tab-design in order to ensure sufficient ampacity from foils of the jellyroll structure to a cylindrical can or a terminal. Furthermore, cylindrical battery cells are most commonly oriented vertical, usually the terminal is used as a plus (+) electrode and the cylindrical can is used as a minus (−) electrode.
This section introduces aspects that may facilitate a better understanding of the disclosure. Accordingly, the statements of this section are to be read in this light and are not to be understood as admissions about what is in the prior art or what is not in the prior art.
However, the inventors found that in some existing schemes, a current has to travel from a bottom of the jellyroll structure to a top of the jellyroll structure via the cylindrical can (cell housing). The cylindrical battery cell in terms of capacity is bigger, the resulting current is higher. This is resulting in additional heat source and electrical resistance creating heat-loss and also inefficiency.
In order to compensate for heat-loss (especially during peak performance or fast charging), a wall thickness of the cylindrical can has to be increased. This will lead to significantly worse filling ratio and loss in space, where usually the space for electrodes and jellyroll structure could be utilized. This also means cell design constantly has to be changed and updated based on rated capacity in order to have perfect balance of energy, cost and electrical resistance.
In order to solve at least part of the above problems, methods and devices are provided in the present disclosure. Features and advantages of embodiments of the present disclosure will also be understood from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the present disclosure.
In general, embodiments of the present disclosure provide a cylindrical battery cell, a battery and a method for forming cylindrical battery cell. It is expected to decrease (or shorten) a current path in a cylindrical battery cell, decrease additional heat-loss and electrical resistance and improve efficiency of the cylindrical battery cell with a simple structure.
In a first aspect, a cylindrical battery cell is provided. The cylindrical battery cell includes:
In some embodiments, the cylindrical battery cell further includes: a terminal which is arranged on the first side of the cylindrical can and is electronically connected to the cathode disk.
In some embodiments, the cylindrical battery cell further includes: a cap plate which is arranged on the first side of the cylindrical can, wherein the cap plate is arranged on the cathode disk and the anode ring, and the cap plate have a hole in which the terminal is arranged.
In some embodiments, the anode ring is arranged outside of the cathode disk in a radial direction.
In some embodiments, the anode ring further includes a flat ring in the radial direction and a wall portion in the axial direction, an insulation ring as the insulation element is arranged inside the wall portion and on the flat ring, and the cathode disk is arranged inside of the insulation ring in the radial direction.
In some embodiments, the cathode disk is an aluminum disk used as a positive electrode, and the anode ring is a copper ring used as a negative electrode.
In some embodiments, the anode foil comprises a first rectangular plate and a first additional portion protruding from the first rectangular plate in the axial direction, before the anode foil is rolled.
In some embodiments, the first additional portion is outside of the anode foil and on the first side of the cylindrical can, after the anode foil is rolled, and the first addition portion is electronically connected to the anode ring.
In some embodiments, the cathode foil comprises a second rectangular plate and a second additional portion protruding from the second rectangular plate in the axial direction, before the cathode foil is rolled.
In some embodiments, the second additional portion is inside of the cathode foil and on the first side of the cylindrical can, after the cathode foil is rolled, and the second addition portion is electronically connected to the cathode disk.
In some embodiments, a plurality of rings of the rolled anode foil on a second side of the cylindrical can are electronically connected via a conductive element.
In some embodiments, the cylindrical battery cell further includes: an injection hole which is arranged in a stop plate on a second side of the cylindrical can.
In some embodiments, the cylindrical battery cell further includes: an injection hole which is arranged in a cap plate on the first side of the cylindrical can.
In a second aspect, a method for forming cylindrical battery cell is provided. The method comprises:
In some embodiments, the method further includes: forming a terminal which is arranged on the first side of the cylindrical can and is electronically connected to the cathode disk.
In some embodiments, the method further includes: forming a cap plate which is arranged on the first side of the cylindrical can, wherein the cap plate is arranged on the cathode disk and the anode ring, and the cap plate have a hole in which the terminal is arranged.
In a third aspect, a battery is provided, the battery includes a plurality of the cylindrical battery cell according to the first aspect of the embodiments.
According to various embodiments of the present disclosure, the current travels inside the cylindrical can and the current path in the cylindrical battery cell is shortened, therefore additional heat-loss and electrical resistance are decreased, furthermore, a wall thickness of the cylindrical can needn't to be increased, this will improve filling ratio and efficiency of the cylindrical battery cell.
The above and other aspects, features, and benefits of various embodiments of the disclosure will become more fully apparent, by way of example, from the following detailed description with reference to the accompanying drawings, in which like reference numerals or letters are used to designate like or equivalent elements. The drawings are illustrated for facilitating better understanding of the embodiments of the disclosure and not necessarily drawn to scale, in which:
The present disclosure will now be described with reference to several example embodiments. It should be understood that these embodiments are discussed only for the purpose of enabling those skilled persons in the art to better understand and thus implement the present disclosure, rather than suggesting any limitations on the scope of the present disclosure.
It should be understood that when an element is referred to as being “connected” or “coupled” or “contacted” to another element, it may be directly connected or coupled or contacted to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected” or “directly coupled” or “directly contacted” to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between”, “adjacent” versus “directly adjacent”, etc.).
As used herein, the terms “first” and “second” refer to different elements. The singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “has,” “having,” “includes” and/or “including” as used herein, specify the presence of stated features, elements, and/or components and the like, but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof.
The term “based on” is to be read as “based at least in part on”. The term “cover” is to be read as “at least in part cover”. The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment”. The term “another embodiment” is to be read as “at least one other embodiment”. Other definitions, explicit and implicit, may be included below.
In this disclosure, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in
In order to solve at least part of the above problems, a cylindrical battery cell, a battery and a method for forming cylindrical battery cell are provided in the present disclosure.
A cylindrical battery cell is provided in the embodiments.
As shown in
In some embodiments, the jellyroll structure 202 is arranged inside the cylindrical can 201, wherein the jellyroll structure 202 includes a rolled anode foil, a rolled cathode foil and a rolled separator between the rolled anode foil and the rolled cathode foil. As shown in
As shown in
As shown in
It should be appreciated that some components or elements are illustrated only as examples in
Therefore, the cathode disk 203 is used for cathode current collection and the anode ring 204 is used for anode current collection, while both the cathode disk 203 and the anode ring 204 are arranged on the top side of the cylindrical can 201. The current path in the cylindrical battery cell 200 is decreased, therefore additional heat-loss and electrical resistance are decreased.
Furthermore, the current will travel inside the jellyroll structure 202 and may be no longer travel via the cylindrical can 201. Therefore, a wall thickness of the cylindrical can 201 not need to be increased, this will improve filling ratio, and improve efficiency of the cylindrical battery cell.
In some embodiments, as shown in
For example, the terminal 206 is used as a positive terminal. In some embodiments, the anode ring 204 may also be electronically connected to the cylindrical can 201 and the cylindrical can 201 is used as a negative terminal, and it is not limited thereto. Therefore, the cylindrical battery cell can be designed with a simple structure.
In some embodiments, as shown in
In some embodiments, the anode ring 204 is arranged outside of the cathode disk 203 in a radial direction.
In some embodiments, as shown in
In some embodiments, the cathode disk 203 is an aluminum disk used as a positive electrode, and the anode ring 204 is a copper ring used as a negative electrode. However, it is not limited thereto, for example, other material may be adopted for the cathode disk 203 and the anode ring 204.
For example, the material of the cathode disk 203 is mainly Al and the material of the anode ring 204 is Cu. The Al disk is used as a positive electrode and the Cu ring is used as a negative electrode. However, it is not limited thereto.
In a manufacture process, the anode foil 601 can be rolled form one side to other side (see an arrow shown in the
Therefore, the anode ring 204 can be electronically connected to the first addition portion (tab) 702 with a simple structure, the space inside the cylindrical can 201 could be further saved.
In a manufacture process, the cathode foil 602 can be rolled form one side to other side (see an arrow shown in the
Therefore, the cathode disk 203 can be electronically connected to the second addition portion (tab) 802 with a simple structure, the space inside the cylindrical can 201 could be further saved.
As shown in
Therefore, the anode foil may still electrically connect through a flattening process on the bottom of the jellyroll structure. This will ensure a very even and homogenous current distribution on the anode side to minimize negative impact towards accelerated aging.
In some embodiments, as shown in
In some embodiments, cylindrical battery cell may further include: an injection hole which is arranged in a cap plate on the first side of the cylindrical can.
As shown in
It should be appreciated that some components or elements are illustrated only as examples in
Furthermore, there are some other elements in some embodiments, such as a positive insulation 301, a sealing 302, an insulation ring 303, a seal 304 and a seal nail 305 in
It is to be understood that, the above examples or embodiments are discussed for illustration, rather than limitation. Those skilled in the art would appreciate that there may be many other embodiments or examples within the scope of the present disclosure.
It can be seen from the above embodiments, the current travels inside the cylindrical can and the current path in the cylindrical battery cell is shortened, therefore additional heat-loss and electrical resistance are decreased, furthermore, a wall thickness of the cylindrical can needn't to be increased, this will improve filling ratio and efficiency of the cylindrical battery cell.
A method for forming cylindrical battery cell is provided in the embodiments. The corresponding devices 200 or 900 are illustrated in the first aspect of embodiments, and the same contents as those in the first aspect of embodiments are omitted.
It should be appreciated that
In some embodiments, the method further includes: forming a terminal which is arranged on the first side of the cylindrical can and is electronically connected to the cathode disk.
In some embodiments, the method further includes: forming a cap plate which is arranged on the first side of the cylindrical can, wherein the cap plate is arranged on the cathode disk and the anode ring, and the cap plate have a hole in which the terminal is arranged.
In some embodiments, the anode foil includes a first rectangular plate and a first additional portion protruding from the first rectangular plate in the axial direction, before the anode foil is rolled; the first additional portion is outside of the anode foil and on the first side of the cylindrical can, after the anode foil is rolled, and the first addition portion is electronically connected to the anode ring.
In some embodiments, the cathode foil includes a second rectangular plate and a second additional portion protruding from the second rectangular plate in the axial direction, before the cathode foil is rolled; the second additional portion inside of the cathode foil and on the first side of the cylindrical can, after the cathode foil is rolled, and the second addition portion is electronically connected to the cathode disk.
In some embodiments, the anode ring is arranged outside of the cathode disk in a radial direction; and a plurality of rings of the rolled anode foil on a second side of the cylindrical can are electronically connected via a conductive element.
It can be seen from the above embodiments, the current travels inside the cylindrical can and the current path in a cylindrical battery cell is shortened, therefore additional heat-loss and electrical resistance are decreased, furthermore, a wall thickness of the cylindrical can needn't to be increased, this will improve filling ratio and efficiency of the cylindrical battery cell.
A battery is provided in the embodiments. The corresponding devices 200 or 900 and the method 1200 are illustrated in the first and second aspects of embodiments, and the same contents as those in the first and second aspects of embodiments are omitted.
In some embodiments, the battery includes a plurality of the cylindrical battery cell according to the first aspects of embodiments.
In some embodiments, a current path is dramatically shortened from an anode side to a cylindrical can and/or a busbar connector. It also enables a significant increase in jellyroll height which will lead to more energy. Also, a height of the cylindrical battery cell and a resulting capacity could easily be scaled for customer needs and application without significant changes on the cell design.
For example, compared to traditional cylindrical battery cell such as 4680 cells, some estimates of the cylindrical battery cell in the present application include: 5-6% energy (due to better filling ratio) is added with the same chemistry condition; 6-8% heat loss on system level is decreased as there is no current via cell-can; there are 5-6% less weight and less cost.
Further, it is expected that one of ordinary skill, notwithstanding possibly significant effort and many design choices motivated by, for example, available time, current technology, and economic considerations, when guided by the concepts and principles disclosed herein will be readily capable of generating such software instructions and programs and integrated circuits (ICs) with minimal experimentation.
Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device.
While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.
Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
Although the present disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
The present disclosure is a national stage application of International Patent Application No. PCT/CN2021/076580, which is filed on Feb. 10, 2021.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/076580 | 2/10/2021 | WO |
