The present invention relates to a battery module including a bent sensing unit and an electronic device including the same. More particularly, the present invention relates to a battery module including a sensing unit bent so as to be attached to a front surface and a rear surface of a housing and an electronic device including the same.
A lithium secondary battery usable as a high-energy-density, high-output energy source has been applied to medium- or large-sized products, such as an electric vehicle, a hybrid electric vehicle, or an energy storage system, as well as small-sized products, such as a portable device.
The lithium secondary battery has also attracted attention as an environmentally friendly energy source, since the lithium secondary battery is capable of remarkably reducing the use of fossil fuels, which were used as conventional energy sources, and generates no byproducts when the lithium secondary battery is used.
In order to apply the lithium secondary battery to the medium- or large-sized products, necessity for a large-capacity, high-output structure has increased. Accordingly, a plurality of lithium secondary batteries may be connected to each other in parallel and/or in series to constitute a battery module, and other structural elements may be added to one or more battery modules to constitute a battery pack.
The number of battery cells included in the battery module and the number of battery modules included in the battery pack may be set depending on output voltage and capacity required by a device in which the battery module or the battery pack is mounted.
When an energy source including a lithium secondary battery is used, shortening of charging time as well as an increase in capacity of a battery module have become a major issue in order to improve user convenience.
When fast charging is performed, however, heat is generated in the battery module, which is directly connected to safety. As a solution thereto, a structure in which the width of an electrode lead is increased may be presented as an alternative.
In a conventional battery module, however, a flexible printed circuit board (FPCB) configured to measure the voltage, current, and temperature of battery cells is added to one surface of a housing, whereby there is a limitation in increasing the width of an electrode lead.
In connection therewith,
Referring to
In the structure in which it is necessary to secure the space of the sensing unit 400 disposed so as to extend in the y-axis direction, as described above, the y-axis direction length of the electrode lead 110, i.e. the width (WL) direction size of the electrode lead, is less than 50% of the height H of the housing, and it is difficult to increase the width of the electrode lead. When the width of the electrode lead is decreased, a temperature increase rate may increase, and therefore it is difficult to solve a problem in that heat is generated in the battery module during fast charging.
As a method of solving generation of heat in the battery module, Patent Document 1 discloses a battery module having a structure in which a thermally conductive adhesive is uniformly applied to the entirety of an upper side of a battery cell assembly, wherein cooling is performed through an upper side of the battery cell assembly as well as the lower side of the battery cell assembly.
Patent Document 1 discloses the structure in which the thermally conductive adhesive is applied in order to improve cooing performance of the battery module, but does not disclose a structure capable of increasing the width of an electrode lead as an alternative for reducing heat generated during fast charging.
Therefore, there is a necessity for a battery module having a structure capable of increasing the width of an electrode lead in order to reduce heat generation encountered during fast charging of the battery module.
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a battery module including a bent sensing unit configured such that heat generated in a battery cell is reduced using an electrode lead having a large width and an electronic device including the same.
A battery module according to the present invention to accomplish the above object includes a battery cell stack constituted by stacked pouch-shaped battery cells, a busbar coupled to an electrode lead of each of the pouch-shaped battery cells, a housing configured to fix the busbar, and a sensing unit disposed at the housing, wherein the sensing unit is added to a first surface of the housing that faces the battery cell stack and to a second surface of the housing, which is an outer surface opposite to the first surface.
The sensing unit may be configured to wrap an outer periphery of one side of the housing.
The sensing unit may be electrically connected to the busbar at the second surface of the housing.
The width of the electrode lead may be 50% to 80% of the height of the housing.
The width of the electrode lead may be 60% to 80% of the overall width of the pouch-shaped battery cell.
The sensing unit may be an FPCB.
A terminal connector may be coupled to a portion added to the second surface of the housing as a part of the sensing unit.
The terminal connector may be added such that a width direction of the terminal connector is identical to a width direction of the housing.
In addition, the present invention provides an electronic device including the battery module as an energy source.
In addition, the present invention may provide possible combinations of the above solving means.
As is apparent from the above description, in the present invention, an electrode lead having a large size compared to the size of an electrode is used, whereby it is possible to remarkably reduce a heat generation phenomenon encountered during fast charging.
In addition, a terminal connector is coupled to a sensing unit in the state in which a width direction of the terminal connector is identical to a width direction of a housing, whereby it is possible to secure a large width of the electrode lead.
In addition, the sensing unit is bent such that the sensing unit is added so as to be disposed at opposite surfaces of the housing, whereby it is possible to secure a large size of the sensing unit. Consequently, it is possible to sense the state of a large number of battery cells.
As described above, the present invention proposes a structure capable of increasing the width of the electrode lead while sensing a large number of battery cells, whereby it is possible to prevent a decrease in lifespan and output of a battery module due to a heat generation phenomenon encountered during fast charging.
Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that the preferred embodiments of the present invention can be easily implemented by a person having ordinary skill in the art to which the present invention pertains. In describing the principle of operation of the preferred embodiments of the present invention in detail, however, a detailed description of known functions and configurations incorporated herein will be omitted when the same may obscure the subject matter of the present invention.
In addition, the same reference numbers will be used throughout the drawings to refer to parts that perform similar functions or operations. In the case in which one part is said to be connected to another part throughout the specification, not only may the one part be directly connected to the other part, but also, the one part may be indirectly connected to the other part via a further part. In addition, that a certain element is included does not mean that other elements are excluded, but means that such elements may be further included unless mentioned otherwise.
In addition, a description to embody elements through limitation or addition may be applied to all inventions, unless particularly restricted, and does not limit a specific invention.
Also, in the description of the invention and the claims of the present application, singular forms are intended to include plural forms unless mentioned otherwise.
Also, in the description of the invention and the claims of the present application, “or” includes “and” unless mentioned otherwise. Therefore, “including A or B” means three cases, namely, the case including A, the case including B, and the case including A and B.
In addition, all numeric ranges include the lowest value, the highest value, and all intermediate values therebetween unless the context clearly indicates otherwise.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to
The housing 300 includes a first surface that faces the battery cell stack and a second surface, which is an outer surface opposite to the first surface, and the sensing unit 400 is bent so as to be added to the first surface and the second surface.
Specifically, the sensing unit 400 may be configured to wrap an outer periphery of one side of the housing 300. For example, in
When compared to the structure in which the sensing unit is arranged only at the second surface in the y-axis direction in the conventional battery module shown in
When considering the fact that the pouch-shaped battery cell has a structure in which the width of the electrode lead is maximized, the pouch-shaped battery cell may be a bidirectional battery cell configured such that a positive electrode lead and a negative electrode lead protrude in opposite directions. The electrode leads are bent so as to be coupled to the busbar in a state of extending to the outside through slits formed in the busbar.
That is, the electrode leads may be coupled to the busbar in various manners.
The sensing unit 400 may be an FPCB configured such that a circuit is printed on an electrically insulative board, and the FPCB, which is the sensing unit 400, may be electrically connected to the busbar 200 at the second surface of the housing so as to be connected to each of the plurality of pouch-shaped battery cells 100 constituting the battery module in order to sense the temperature, voltage, and current thereof.
The y-axis direction length of the electrode lead 110 according to the present invention, i.e. the width WL of the electrode lead, is greater than that of the electrode lead in the conventional battery module. For example, the width WL of the electrode lead may be 50% to 80% of the height H of the housing. Specifically, when the height H of the housing is 110 mm, an electrode lead having a width of 60 mm to 80 mm may be used. The width of the electrode lead may be increased by about 20% to 100%, compared to a conventional structure in which, when the height of the housing was 110 mm, an electrode lead having a width of 40 mm to 50 mm was used.
A terminal connector 500, as a connection portion configured to transmit data measured by the sensing unit of the battery module, may be attached to the sensing unit 400. In
Referring to
The electrode assembly may be a stacked and folded type electrode assembly, in which unit cells, each of which is constituted by a bi-cell or a monocell, are wound in a state of being disposed on a separator sheet, or a laminated and stacked type electrode assembly, in which the unit cells are stacked in the state in which a separator is interposed therebetween.
The bi-cell is configured to have a structure in which three electrode plates disposed such that adjacent electrodes have different polarities are stacked in the state in which separators are interposed therebetween, and the monocell is configured to have a structure in which two electrode plates having different polarities are stacked in the state in which a separator is interposed therebetween.
The width WT of the electrode tab 120 protruding from the electrode plate 121 is greater than the width WL of the electrode lead 110. In general, when considering the fact that the electrode tab 120 further extends by 5 mm from the electrode lead 110 in the width direction, the width of the electrode tab may be increased so as to correspond to the structure in which the width of the electrode lead is increased.
For example, when the width WL of the electrode lead 110 is 60 mm to 80 mm, the width WT of the electrode tab 120 may be 70 mm to 90 mm.
That is, in the pouch-shaped battery cell used in the present invention, an electrode tab having a size greater than the size of an electrode tab of a conventional electrode assembly is used. The electrode tab is coupled to an electrode lead having an increased width, whereby it is possible to reduce a heat generation phenomenon encountered during fast charging.
Referring to
In the pouch-shaped battery cell 100, the width WL of the electrode lead may be 60% to 80% of the overall width WC of the pouch-shaped battery cell 100. Specifically, when the overall width WC of the battery cell is 100 mm, an electrode lead having a width of 60 mm to 80 mm may be used. That is, the width of the electrode lead may be increased by about 20% to 100%, compared to a conventional structure in which, when the overall width WC of the battery cell was 100 mm, an electrode lead having a width of 40 mm to 50 mm was used.
In the present invention, as described above, the bent sensing unit may be added, and the terminal connector may be disposed in the same direction as the width direction of the housing, whereby it is possible to increase the width of the electrode lead. Consequently, it is possible to minimize a heat generation phenomenon of the battery cell during fast charging, whereby it is possible to improve performance of the battery cell.
The present invention provides an electronic device including the battery module as an energy source.
The electronic device may be an electric vehicle, a hybrid electric vehicle, an electric bicycle, an electric cart, or an energy storage system, the detailed structure of which will omitted, since the electronic device may be configured to have a known structure.
Those skilled in the art to which the present invention pertains will appreciate that various applications and modifications are possible within the category of the present invention based on the above description.
Number | Date | Country | Kind |
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10-2021-0074882 | Jun 2021 | KR | national |
The present application is a national phase entry under 35 U.S.C § of International Application No. PCT/KR2022/008109 filed Jun. 9, 2022, which claims priority from Korean Patent Application No. 10-2021-0074882 filed on Jun. 9, 2021, all of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/KR2022/008109 | 6/9/2022 | WO |