Battery cell and battery module

Abstract

To provide a battery cell capable of efficiently dissipating heat which is generated from an electrode body, and a battery module with the battery cell.SOLUTION: A battery cell comprises: an electrode body in which a plurality of multilayer structures each including a cathode, an anode and a separator interposed between the cathode and the anode are further laminated; and a battery cell case in which the electrode body is encapsulated. In the battery cell, each of the cathode and the anode includes a collector and a mixture which contains an active material and with which a surface of the collector is coated. At least one of the collector in the cathode and the collector in the anode includes a non-coated part where a peripheral edge of the surface is not coated with the mixture. In the collectors including the non-coated parts, the non-coated part in the collector with a largest distance from a surface of the battery cell case is defined as a first non-coated part, and the first non-coated part includes a first exposed portion extending to the outside of the battery cell case.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a battery cell and a battery module. [Background technology]

[0002] 2. Description of the Related Art Battery cells in which an electrode assembly, in which a positive electrode, a negative electrode, and a separator are stacked in multiple layers, is sealed inside a battery cell case have been used.

[0003] For example, Patent Document 1 discloses a battery cell in which a component for dissipating heat generated from the electrode body (e.g., heat generated during charging / discharging or when a short circuit occurs) is attached inside the electrode body, and part of the heat dissipation component is exposed to the outside. Moreover, Patent Document 2 discloses a battery cell having a structure in which a current collector arranged near the battery cell case extends to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2015-522912 [Patent Document 2] International Publication No. 2013 / 027306 Summary of the Invention [Problem to be solved by the invention]

[0005] The battery cell disclosed in Patent Document 1 has a structure in which the heat dissipation member is exposed to the outside of the battery cell to dissipate heat generated from the electrode body, while Patent Document 2 has a current collector that extends to the outside of the battery cell to provide a path for dissipating heat from the electrode body. However, there is a demand for a structure that can dissipate heat more efficiently.

[0006] The present disclosure has been made in consideration of the above-described situation, and aims to provide a battery cell capable of efficiently dissipating heat generated from an electrode body, and a battery module including such a battery cell. [Means for solving the problem]

[0007] <1> an electrode assembly in which a plurality of laminated structures each having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are laminated; a battery cell case that encloses the electrode body therein, Each of the positive electrode and the negative electrode has a current collector and a composite material containing an active material and coated on a surface of the current collector, At least one of the current collector of the positive electrode and the current collector of the negative electrode has an uncoated portion on a peripheral portion of a surface thereof that is not coated with the composite material, A battery cell, wherein the uncoated portion of the current collector having the uncoated portion that is farthest from the surface of the battery cell case is defined as a first uncoated portion, and the first uncoated portion has a first exposed portion that extends to the outside of the battery cell case. <2> The shape of the electrode surface of the electrode body is rectangular, and the first exposed portion is disposed on a long side of the rectangular shape. <1> The battery cell according to claim 1. <3> The shape of the electrode surface of the electrode body is rectangular, and the electrode having a longer side length of the rectangular shape between the positive electrode and the negative electrode has the first exposed portion. <1> or <2> The battery cell according to claim 1. <4> a second uncoated portion is an uncoated portion of a current collector that is closer to a surface of the battery cell case than the current collector having the first uncoated portion, and the second uncoated portion has a second exposed portion that extends to an outside of the battery cell case; <1> ~ <3> 13. The battery cell according to claim 12 . <5> a portion where the first uncoated portion and the second uncoated portion are joined inside the battery cell case; <4> The battery cell according to claim 1. <6> The thickness of the first uncoated portion is greater than the thickness of the second uncoated portion; <4> or <5> The battery cell according to claim 1. <7> <1> ~ <5> A battery cell according to any one of claims 1 to 5, A battery module including at least one of a cooler and a battery module case, the first exposed portion is insulated and joined to at least one of the cooler and the battery module case. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a battery cell capable of efficiently dissipating heat generated from an electrode body, and a battery module including the battery cell. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic cross-sectional view illustrating a battery cell according to an embodiment of the present disclosure; [Diagram 2] FIG. 1 is a schematic perspective view showing an electrode assembly in a battery cell according to an embodiment of the present disclosure. [Diagram 3] 1 is a schematic cross-sectional view illustrating another aspect of a battery cell according to an embodiment of the present disclosure; FIG. [Figure 4] FIG. 2 is a schematic plan view showing a main part of the vehicle. [Diagram 5] FIG. 2 is a schematic perspective view of a battery module. [Figure 6] FIG. 2 is a plan view of the battery module with the top cover removed. [Figure 7] 3 is a schematic diagram of a battery cell accommodated in a battery module as viewed from the thickness direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Battery cell> A battery cell according to an embodiment of the present disclosure includes an electrode assembly in which a laminate structure having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is stacked in multiple layers, and a battery cell case that encloses the electrode assembly. The positive electrode and the negative electrode each include a current collector and a composite material containing an active material and coated on the surface of the current collector. Furthermore, at least one of the current collector in the positive electrode and the current collector in the negative electrode has an uncoated portion on the periphery of the surface where the composite material is not coated. Among the current collectors having uncoated portions, the uncoated portion of the current collector that is farthest from the surface of the battery cell case is designated as the first uncoated portion, and the first uncoated portion has a first exposed portion that extends to the outside of the battery cell case. Note that, among the current collectors having uncoated portions, the current collector that is farthest from the surface of the battery cell case refers to, for example, in a stacked electrode assembly, the current collector that is closest to the center of the electrode assembly in the stacking direction of the electrode assembly.

[0011] Hereinafter, an embodiment of a battery cell according to the present disclosure will be described with reference to the drawings. The drawings shown below are schematic diagrams, and the size and shape of each part are appropriately exaggerated to make them easier to understand.

[0012] FIG. 1 is a schematic cross-sectional view illustrating a battery cell according to an embodiment of the present disclosure. The battery cell 20 shown in FIG. 1 has a positive electrode 4, a negative electrode 5, and a separator 6 interposed between the positive electrode 4 and the negative electrode 5. A plurality of laminated structures of the positive electrode 4, the negative electrode 5, and the separator 6 are further laminated to form an electrode body 8. The positive electrode 4 has a positive electrode current collector 42 and a positive electrode mixture 44 containing an active material and coated on the surface of the positive electrode current collector 42, and the negative electrode 5 has a negative electrode current collector 52 and a negative electrode mixture 54 containing an active material and coated on the surface of the negative electrode current collector 52. In the electrode body 8 shown in FIG. 1, a structure in which the negative electrode 5, the separator 6, and the positive electrode 4 are laminated in this order is laminated next to a structure in which the positive electrode 4, the separator 6, and the negative electrode 5 are laminated in this order, that is, the negative electrodes 5 are adjacent to each other, and the adjacent negative electrodes 5 share the negative electrode current collector 52. Similarly, next to a structure in which the negative electrode 5, separator 6, and positive electrode 4 are stacked in this order, a structure in which the positive electrode 4, separator 6, and negative electrode 5 are stacked in this order is stacked, that is, the positive electrodes 4 are adjacent to each other, and the adjacent positive electrodes 4 share the positive electrode current collector 42. Therefore, the electrode body 8 shown in FIG. 1 is stacked in the order of "positive electrode current collector 42, positive electrode mixture 44, separator 6, negative electrode mixture 54, negative electrode current collector 52, negative electrode mixture 54, separator 6, positive electrode mixture 44, positive electrode current collector 42, positive electrode mixture 44, separator 6, negative electrode mixture 54, negative electrode current collector 52, negative electrode mixture 54...positive electrode current collector 42".

[0013] The battery cell 20 has a battery cell case 7 that encloses an electrode body 8. The battery cell case 7 forms a housing section that encloses the electrode body 8 inside by fusing the ends of two films together.

[0014] The positive electrode current collector 42 of the positive electrode 4 has an uncoated portion on the periphery of its surface that is not coated with the positive electrode composite material 44, and similarly, the negative electrode current collector 52 of the negative electrode 5 has an uncoated portion on the periphery of its surface that is not coated with the negative electrode composite material 54. Among the current collectors having uncoated portions, the uncoated portion (referred to as the "first uncoated portion") 52B of the negative electrode current collector 520 that corresponds to the current collector that is the farthest from the surface of the battery cell case 7 extends to the outside of the battery cell case 7 and includes a first exposed portion 52A exposed from the battery cell case 7. In other words, the first uncoated portion 52B of the negative electrode current collector 520 continues to the first exposed portion 52A disposed outside the battery cell case 7. The tip of the first exposed portion 52A is formed in a curved shape. The negative electrode current collector 520 including the first exposed portion 52A is the current collector closest to the center of the electrode body 8 in the stacking direction of the electrode body 8 (the direction of the arrow X in FIG. 1).

[0015] The battery cell according to the embodiment of the present disclosure has the above-described configuration and is therefore capable of efficiently dissipating heat generated from the electrode assembly.

[0016] In the electrode body, heat is generated during charging / discharging, short circuiting, etc. In order to dissipate the heat generated from the electrode body, in the past, for example, a structure was adopted in which a heat dissipation member was exposed to the outside of the battery cell to dissipate the heat generated from the electrode body, or a current collector was extended to the outside of the battery cell to provide a path for dissipating heat from the electrode body. However, in the former, there is a risk that the heat conduction at the joint between the electrode body and the heat dissipation member becomes the rate-limiting process depending on the joint state between the electrode body and the heat dissipation member, and in the latter, there is a risk that a rate-limiting process occurs in the heat dissipation route from the center of the electrode body having a stacked structure. Therefore, there is a demand for more efficient dissipation of the heat generated from the electrode body.

[0017] In contrast, the battery cell according to the embodiment of the present disclosure is structured so that the current collector having an uncoated portion in the electrode assembly housed in the battery cell is used as the heat dissipation member, and among the current collectors having an uncoated portion, the current collector furthest from the surface of the battery cell case is used as the heat dissipation member. Therefore, in the electrode assembly, which is the heat source, the current collector located in the center where heat is particularly likely to accumulate is used as the heat dissipation member. This allows for smooth heat dissipation without a rate-limiting process for thermal conduction, and allows the heat generated from the electrode assembly to be efficiently dissipated. Furthermore, no separate dedicated component is used for heat dissipation, which leads to a reduction in the number of parts.

[0018] Location of the first exposed part When the shape of the electrode surface of the electrode body is rectangular, the first exposed portion is preferably disposed on the long side of the rectangular shape. That is, as shown in Fig. 2, when the electrode body 8 is substantially rectangular and the electrode surface 8A is rectangular, the first exposed portion 52A of the current collector 520 is preferably disposed on the long side surface 8B rather than on the short side surface 8C of the rectangular shape of the electrode surface 8A. Note that in Fig. 2, the positive electrode current collector, positive electrode composite material, negative electrode current collector, negative electrode composite material, separator, and the like that constitute the electrode body 8 are omitted, and the electrode body is simply depicted as the electrode body 8 except for the current collector 520 having the first exposed portion 52A. With this configuration, the distance between the center of the electrode body, where heat tends to accumulate, and the first exposed portion can be reduced, and the cross-sectional area of ​​the heat dissipation path can be increased, so that heat generated from the electrode body can be dissipated more efficiently.

[0019] Electrode having a first exposed portion When the electrode surface of the electrode body is rectangular, it is preferable to provide the first exposed portion on the electrode having the longer side of the rectangular shape, either the positive electrode or the negative electrode. This increases the cross-sectional area of ​​the heat dissipation path, so that the heat generated from the electrode body can be dissipated more efficiently. It is preferable that the electrode having the longer side of the rectangular shape, either the positive electrode or the negative electrode, is the negative electrode.

[0020] ·Second exposed part FIG. 1 shows an embodiment in which the uncoated portion of the current collector has only one exposed portion that extends to the outside of the battery cell case, but this is not limited to this and the current collector may have two or more exposed portions.

[0021] Here, an embodiment having two exposed portions will be described with reference to FIG.

[0022] FIG. 3 is a schematic cross-sectional view illustrating another aspect of a battery cell according to an embodiment of the present disclosure. In the battery cell 20 shown in FIG. 3, a first uncoated portion 52B in a negative electrode current collector 520, which corresponds to the current collector having the greatest distance from the surface of the battery cell case 7 among the current collectors having an uncoated portion, extends to the outside of the battery cell case 7 and includes a first exposed portion 52A exposed from the battery cell case 7. Also, an uncoated portion (referred to as a "second uncoated portion") 42B in a positive electrode current collector 420, which is closer to the surface of the battery cell case 7 than the negative electrode current collector 520 having the first exposed portion 52A, includes a second exposed portion 42A extending to the outside of the battery cell case 7. In other words, the first uncoated portion 52B in the negative electrode current collector 520 continues to the first exposed portion 52A arranged outside the battery cell case 7, and the second uncoated portion 42B in the positive electrode current collector 420 continues to the second exposed portion 42A arranged outside the battery cell case 7. The tip ends of the first exposed portion 52A and the second exposed portion 42A are both formed in a curved shape. The negative electrode current collector 520 having the first exposed portion 52A is the current collector closest to the center of the electrode body 8 in the stacking direction of the electrode body 8, and the positive electrode current collector 420 having the second exposed portion 42A is the current collector farther from the center of the electrode body 8 than the negative electrode current collector 520 in the stacking direction of the electrode body 8.

[0023] With this configuration, the cross-sectional area of ​​the heat dissipation path can be increased, so that the heat generated from the electrode body can be dissipated more efficiently.

[0024] It is preferable that the second uncoated portion is joined to the first uncoated portion inside the battery cell case. By providing a portion inside the battery cell case where the first uncoated portion and the second uncoated portion are joined, heat from the entire stacked electrode body can be dissipated efficiently.

[0025] In addition, it is preferable that the thickness of the first uncoated portion (the thickness of uncoated portion 52B in positive electrode current collector 420 in FIG. 2) is greater than the thickness of the second uncoated portion (the thickness of uncoated portion 42B in negative electrode current collector 520 in FIG. 2). Note that the thickness refers to the average thickness, and means the arithmetic mean value of thicknesses at 10 points arbitrarily selected from among the relevant points. Because the thickness of the first uncoated area is greater, heat can be dissipated preferentially from the center, where heat tends to build up.

[0026] In the battery cell 20 shown in Fig. 1, the first uncoated portion 52B of the negative electrode current collector 520 is exposed to the outside through a fusion portion where the ends of two films are fused together. In the battery cell 20 shown in Fig. 3, the first uncoated portion 52B of the negative electrode current collector 520 and the second uncoated portion 42B of the positive electrode current collector 420 are exposed to the outside through a fusion portion where the ends of two films are fused together. In order to improve fusion and airtightness, it is preferable that the surfaces of the first uncoated portion 52B and the second uncoated portion 42B that pass through the fusion portion of the battery cell case 7 are subjected to at least one of roughening treatment and carbon coating treatment.

[0027] 1 and 3 show the configuration of stacked electrode assemblies, the battery cell according to the embodiment of the present disclosure is not limited to this configuration. For example, the battery cell may have a structure of a wound electrode body cell including a wound electrode body therein.

[0028] Next, a battery module, a battery pack, and a vehicle including a battery cell according to an embodiment of the present disclosure will be described with reference to the drawings.

[0029] (Overall configuration of vehicle 100) Fig. 4 is a schematic plan view showing a main part of a vehicle 100 to which a battery pack 10 according to an embodiment is applied. As shown in Fig. 4, the vehicle 100 is an electric vehicle (BEV: Battery Electric Vehicle) in which the battery pack 10 is mounted under the floor. Note that the arrows UP, FR, and LH in each figure indicate the upper side in the vehicle vertical direction, the front side in the vehicle front-rear direction, and the left side in the vehicle width direction, respectively. When describing using the front-rear, left-right, up-down directions, they refer to the front-rear in the vehicle front-rear direction, the left-right in the vehicle width direction, and the up-down in the vehicle vertical direction, unless otherwise specified.

[0030] As an example, in the vehicle 100 of this embodiment, a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 are disposed on the vehicle front side of the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are disposed on the vehicle rear side of the battery pack 10.

[0031] The direct current output from the battery pack 10 has its voltage adjusted by a DC / DC converter 102, and is then supplied to an electric compressor 104, a PTC heater 106, an inverter 112, etc. In addition, power is supplied to a motor 108 via the inverter 112, causing the rear wheels to rotate and causing the vehicle 100 to run.

[0032] A charging port 116 is provided on the right side at the rear of the vehicle 100, and by connecting a charging plug of an external charging device (not shown) to the charging port 116, power can be stored in the battery pack 10 via the on-board charger 114.

[0033] The arrangement and structure of each component constituting the vehicle 100 are not limited to the above-mentioned configuration. For example, the present invention may be applied to a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine or a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle). In addition, in the present embodiment, the vehicle is a rear-wheel drive vehicle in which the motor 108 is mounted at the rear of the vehicle, but the present invention is not limited to this. The vehicle may be a front-wheel drive vehicle in which the motor 108 is mounted at the front of the vehicle, or a pair of motors 108 may be mounted at the front and rear of the vehicle. Furthermore, the vehicle may be equipped with an in-wheel motor on each wheel.

[0034] Here, the battery pack 10 is configured to include a plurality of battery modules 11. As an example in this embodiment, ten battery modules 11 are provided. Specifically, five battery modules 11 are arranged on the right side of the vehicle 100 in the vehicle front-rear direction, and five battery modules 11 are arranged on the left side of the vehicle 100 in the vehicle front-rear direction. In addition, each battery module 11 is electrically connected.

[0035] Fig. 5 is a schematic perspective view of the battery module 11. As shown in Fig. 5, the battery module 11 is formed in a substantially rectangular parallelepiped shape with the vehicle width direction as the longitudinal direction. The outer shell of the battery module 11 is formed of an aluminum alloy. For example, the outer shell of the battery module 11 is formed by joining aluminum die castings to both ends of an aluminum alloy extrusion material by laser welding or the like.

[0036] A pair of voltage terminals 12 and a connector 14 are provided at both ends of the battery module 11 in the vehicle width direction. A flexible printed circuit board 22, which will be described later, is connected to the connector 14. In addition, bus bars (not shown) are welded to both ends of the battery module 11 in the vehicle width direction.

[0037] The length MW of the battery module 11 in the vehicle width direction is, for example, 350 mm to 600 mm, the length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle up-down direction is, for example, 80 mm to 110 mm.

[0038] Fig. 6 is a plan view of the battery module 11 with the top cover removed. As shown in Fig. 6, a plurality of battery cells 20 are housed in an arranged state inside the battery module 11. In this embodiment, as an example, 24 battery cells 20 are arranged in the front-rear direction of the vehicle and bonded to one another.

[0039] A flexible printed circuit (FPC) 22 is disposed on the battery cells 20. The flexible printed circuit 22 is formed in a strip shape with the vehicle width direction as the longitudinal direction, and a thermistor 24 is provided on each of both ends of the flexible printed circuit 22. The thermistor 24 is not bonded to the battery cells 20, and is configured to be pressed towards the battery cells 20 by the upper lid of the battery module 11.

[0040] One or more cushioning materials (not shown) are housed inside the battery module 11. For example, the cushioning materials are elastically deformable thin plate-like members, and are arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 being the thickness direction. As an example in this embodiment, cushioning materials are arranged at both ends of the battery module 11 in the longitudinal direction and in the central portion in the longitudinal direction.

[0041] Fig. 7 is a schematic diagram of a battery cell 20 housed in a battery module 11, viewed from the thickness direction. As shown in Fig. 7, the battery cell 20 is formed in a substantially rectangular plate shape, and houses an electrode body (not shown) inside. The electrode body is configured by laminating a positive electrode, a negative electrode, and a separator, and is sealed with a laminate film 28.

[0042] In this embodiment, as an example, the housing portion for the electrode body is formed by folding and pasting an embossed sheet-like laminate film 28. Note that although both a single cup embossed structure in which embossing is performed at one place and a double cup embossed structure in which embossing is performed at two places can be adopted, the present embodiment adopts a single cup embossed structure with a drawing depth of about 8 mm to 10 mm.

[0043] The upper ends of the battery cells 20 at both ends in the longitudinal direction are bent to form corners. The upper end of the battery cells 20 is also bent, and a fixing tape 30 is wound around the upper end of the battery cells 20 along the longitudinal direction.

[0044] Here, terminals (tabs) 26 are provided at both longitudinal ends of the battery cell 20. In this embodiment, as an example, the terminals 26 are provided at positions offset downward from the vertical center of the battery cell 20. The terminals 26 are joined to a bus bar (not shown) by laser welding or the like.

[0045] The length CW1 of the battery cell 20 in the vehicle width direction is, for example, 530 mm to 600 mm, the length CW2 of the area in which the electrode body is housed is, for example, 500 mm to 520 mm, and the height CH of the battery cell 20 is, for example, 80 mm to 110 mm. The thickness of the battery cell 20 is 7.0 mm to 9.0 mm, and the height TH of the terminal 26 is 40 mm to 50 mm.

[0046] Module case for battery modules The battery module may further be housed in a battery module case. In this case, it is preferable that the first exposed portion of the battery cell (preferably the first exposed portion and the second exposed portion, more preferably all exposed portions) is insulated and joined to the battery module case. By insulating and joining the exposed portions to the battery module case, heat generated from the electrode body can be dissipated more efficiently.

[0047] - Cooling device for battery modules The battery module may further include a cooler. In this case, it is preferable that the first exposed portion of the battery cell (preferably the first exposed portion and the second exposed portion, more preferably all exposed portions) are insulated and joined to the cooler. By insulating and joining the exposed portions to the cooler, heat generated from the electrode body can be dissipated more efficiently. Examples of the insulating joining method include potting and joining using alumina. [Explanation of symbols]

[0048] 4 positive electrode, 42, 420 positive electrode collector, 42A second exposed portion, 44 positive electrode composite material, 5 negative electrode, 52, 520 negative electrode collector, 52A first exposed portion, 54 negative electrode composite material, 6 separator, 7 battery cell case, 8 electrode body, 10 battery pack, 11 battery module, 12 voltage terminal, 14 connector, 20 battery cell, 22 flexible printed circuit board, 24 thermistor, 26 terminal, 28 laminate film, 30 fixing tape, 100 vehicle, 102 converter, 104 electric compressor, 106 heater, 108 motor, 110 gearbox, 112 inverter, 114 on-board charger, 114 charger, 116 charging port

Claims

1. an electrode assembly in which a plurality of laminated structures each having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are laminated; a battery cell case that encloses the electrode body therein, Each of the positive electrode and the negative electrode has a current collector and a composite material containing an active material and coated on a surface of the current collector, At least one of the current collector of the positive electrode and the current collector of the negative electrode has an uncoated portion on a peripheral portion of a surface thereof that is not coated with the composite material, A battery cell, wherein the uncoated portion of the current collector having the uncoated portion that is farthest from the surface of the battery cell case is defined as a first uncoated portion, and the first uncoated portion has a first exposed portion that extends to the outside of the battery cell case.

2. The battery cell according to claim 1 , wherein the electrode surface of the electrode body has a rectangular shape, and the first exposed portion is disposed on a long side of the rectangular shape.

3. The battery cell according to claim 1 , wherein the electrode surface of the electrode body has a rectangular shape, and the electrode having a longer side length of the rectangular shape out of the positive electrode and the negative electrode has the first exposed portion.

4. 2. The battery cell according to claim 1, wherein the uncoated portion in the current collector that is closer to the surface of the battery cell case than the current collector having the first uncoated portion is a second uncoated portion, and the second uncoated portion has a second exposed portion that extends to the outside of the battery cell case.

5. The battery cell according to claim 4 , further comprising a portion inside the battery cell case where the first uncoated portion and the second uncoated portion are joined.

6. The battery cell according to claim 4 , wherein a sheet thickness of the first uncoated portion is greater than a sheet thickness of the second uncoated portion.

7. A battery cell according to any one of claims 1 to 6, A battery module including at least one of a cooler and a battery module case, the first exposed portion is insulated and joined to at least one of the cooler and the battery module case.

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