Battery cell and battery module

Abstract

A battery cell (10) is provided with: a battery element (100); an exterior member (120) that accommodates the battery element (100); and a first protective tape (136a) that covers at least a portion of the right sealing edge (126b) of the exterior member (120).

Description

Technical Field

[0001] The present invention relates to a battery cell and a battery module. Background Art

[0002] In recent years, various structures of battery cells, such as lithium-ion secondary battery cells, have been developed. For example, as described in Patent Document 1, a battery cell includes a battery element and an exterior member. The exterior member includes an upper exterior member that covers the upper portion of the battery element and a lower exterior member that covers the lower portion of the battery element. A sealing edge is formed on the exterior member by heat-welding the upper exterior member and the lower exterior member. In the battery cell described in Patent Document 1, the sealing edge of the battery element along the longitudinal direction is bent into a given bent shape. A band is provided on the sealing edge to fix the bent shape of the sealing edge.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2018-521481 Summary of the Invention

[0006] -Problems to be solved by the invention-

[0007] (Method 1)

[0008] Sometimes, relatively high heat is generated around the seal edge of the exterior component. For example, welding of parts of the housing that hold the battery cells can generate relatively high heat. This heat can affect the sealing performance of the seal edge.

[0009] One example of the purpose of the first embodiment of the present invention is to suppress the influence of heat on the sealing performance of the seal edge. Other purposes of the first embodiment of the present invention will become clear from the description of this specification.

[0010] (Method 2)

[0011] In the battery cell described in Patent Document 1, a band that secures the bent shape of the sealing edge is provided throughout the entire sealing edge. However, when this band is provided throughout the entire sealing edge, it is sometimes difficult to ensure heat dissipation from the battery cell. On the other hand, when this band is not provided, it is sometimes difficult to maintain the bent shape of the sealing edge.

[0012] One example of the purpose of the second aspect of the present invention is to fix the bent shape of the sealing edge of the exterior member while ensuring the heat dissipation of the battery cell. Other purposes of the second aspect of the present invention will become clear from the description of this specification.

[0013] -Methods for solving the problem-

[0014] Mode 1 of the present invention is as follows. [1.1]

[0016] A battery cell includes: a battery element; an exterior member housing the battery element; and a heat-resistant member covering at least a portion of a sealing edge of the exterior member. [1.2]

[0018] The battery cell according to [1.1], wherein the sealing edge is bent into a predetermined bent shape, and the heat-resistant body fixes the bent shape of the sealing edge. [1.3]

[0020] In the battery cell according to [1.1] or [1.2], the heat-resistant member has insulating properties, and the heat-resistant member covers at least a portion of at least one of both ends of the sealing edge.

[0021] [1.4] A battery module comprising a plurality of battery cells stacked in a given direction, wherein the battery cell according to any one of [1.1] to [1.3] is arranged on at least one of both ends of the plurality of battery cells in the given direction.

[0022] A second embodiment of the present invention is as follows. [2.1]

[0024] A battery cell comprises: a battery element; an exterior member having a sealing edge bent into a predetermined bent shape and accommodating the battery element; and a first fixing body for fixing the bent shape of the sealing edge, the first fixing body being partially provided on the sealing edge.

[0025] [2.2] The battery cell according to [2.1] further comprising: a second fixing body that fixes the stacked shape of the positive electrode, the negative electrode, and the separator included in the battery element, wherein the first fixing body and the second fixing body are arranged to be staggered with respect to each other along the sealing edge. [2.3]

[0027] A battery module includes a plurality of battery cells according to [2.1] or [2.2] that are electrically connected to each other.

[0028] -Effects of the Invention-

[0029] According to the first aspect of the present invention, the influence of heat on the sealing performance of the seal edge can be suppressed.

[0030] According to the second aspect of the present invention, the bent shape of the sealing edge of the exterior member can be fixed while ensuring the heat dissipation of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is an exploded perspective view of a battery module according to the embodiment.

[0032] Figure 2 It is a plan view of a battery cell according to the embodiment.

[0033] Figure 3 It is a front view of a battery cell according to the embodiment.

[0034] Figure 4 It is a perspective view of a battery element according to an embodiment.

[0035] Figure 5 This is a diagram for explaining a battery cell located at the rightmost end of a cell stack according to the embodiment. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present invention will be described using the accompanying drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[0037] Figure 1 It is an exploded perspective view of the battery module 1 according to the embodiment. Figure 2 It is a plan view of the battery cell 10 according to the embodiment. Figure 3 It is a front view of the battery cell 10 according to the embodiment. Figure 4 It is a perspective view of a battery element 100 according to the embodiment. Figure 5 1 is a diagram for explaining the battery cell 10 located at the rightmost end of the cell stack 10S according to the embodiment. Figure 3 For the sake of explanation, the positive electrode tab 112 and the negative electrode tab 114 are not shown.

[0038] In each drawing, the X direction, the Y direction, and the Z direction are indicated for the sake of explanation.

[0039] exist Figure 1 , the X-direction, Y-direction, and Z-direction are as follows. The X-direction indicates the front-to-back direction of the battery module 1. The Y-direction is orthogonal to the X-direction. The Y-direction indicates the left-to-right direction of the battery module 1. The Z-direction is orthogonal to both the X-direction and the Y-direction. The Z-direction indicates the up-down direction of the battery module 1. The directions indicated by the arrows indicating the X-direction, the Y-direction, and the Z-direction are the rear direction, the left direction, and the up direction, respectively. However, the relationships among the X-direction, Y-direction, Z-direction, front-to-back direction, left-to-right direction, and up-down direction of the battery module 1 are not limited to this example.

[0040] exist Figures 2 to 5In FIG, the X direction, Y direction, and Z direction are as follows. The X direction indicates the front-back direction of the battery cell 10. The Y direction is perpendicular to the X direction. The Y direction indicates the up-down direction of the battery cell 10. The Z direction is perpendicular to both the X direction and the Y direction. The Z direction indicates the left-right direction of the battery cell 10. The direction indicated by the arrow indicating the X direction, the direction indicated by the arrow indicating the Y direction, and the direction indicated by the arrow indicating the Z direction are the rear direction, the downward direction, and the left direction, respectively. That is, in FIG. Figure 1 In the example, each battery cell 10 is arranged so that the left-right direction and the top-down direction of the battery cell 10 are substantially parallel to the top-down direction and the left-right direction of the battery module 1. However, the relationship among the X direction, Y direction, Z direction, front-back direction, left-right direction, and top-down direction of the battery cell 10 is not limited to this example.

[0041] In addition, a white circle with an X indicating the X direction, the Y direction, or the Z direction means that the direction from the front to the back of the paper is the direction indicated by the arrow indicating the direction.

[0042] Reference Figure 1 , refer to Figure 4 , the battery module 1 is described.

[0043] The battery module 1 includes a cell stack 10S and a housing 20 .

[0044] The cell stack 10S includes a plurality of battery cells 10 and a plurality of compression pads 12. The battery cells 10 and the compression pads 12 are alternately stacked in the Y direction. The long side of each battery cell 10 is substantially parallel to the X direction. The short side of each battery cell 10 is substantially parallel to the Z direction. The thickness of each battery cell 10 is substantially parallel to the Y direction. The shape of each battery cell 10 is not limited to this example.

[0045] like Figure 1 as well as Figure 4 As shown, each battery cell 10 includes a battery element 100 , a positive electrode tab 112 , a negative electrode tab 114 , and an exterior member 120 .

[0046] like Figure 4As shown, the battery element 100 includes a stack of multiple positive electrodes 102, multiple negative electrodes 104, and multiple separators 106. The multiple positive electrodes 102 and the multiple negative electrodes 104 are alternately stacked in the Y direction. Each separator 106 is located between the positive electrodes 102 and the negative electrodes 104 adjacent in the Y direction. However, the structure of the battery element 100 is not limited to this example. The battery element 100 can include a stack of at least one positive electrode 102, at least one negative electrode 104, and at least one separator 106. For example, a single sheet of separator 106 can be alternately folded back at both ends in the Z direction to form a zigzag shape. In this example, the portion of the separator 106 located between the folded ends in the Z direction is arranged between the positive electrodes 102 and the negative electrodes 104 adjacent in the Y direction.

[0047] like Figure 4 As shown, the positive electrode tab 112 is electrically connected to the plurality of positive electrodes 102 of the battery element 100 via a plurality of positive electrode current collectors 102a extending from the plurality of positive electrodes 102 of the battery element 100. The negative electrode tab 114 is electrically connected to the negative electrode 104 of the battery element 100 via a plurality of negative electrode current collectors 104a extending from the plurality of negative electrodes 104 of the battery element 100. Figure 4 In the example shown, the positive electrode tab 112 is led out toward the front of the battery element 100 , and the negative electrode tab 114 is led out toward the rear of the battery element 100 .

[0048] The exterior member 120 houses the battery element 100 and an electrolyte solution (not shown).

[0049] In an embodiment, a plurality of battery cells 10 are electrically connected. Specifically, a plurality of cell groups 10G are connected in series, from a cell group 10G located at one end in the Y direction to a cell group 10G located at the other end in the Y direction. Each cell group 10G includes a plurality of battery cells 10 connected in parallel. In an embodiment, each cell group 10G includes two battery cells 10 adjacent in the Y direction. The two positive electrode tabs 112 extending from the two battery cells 10 included in each cell group 10G face the same side in the X direction. The two negative electrode tabs 114 extending from the two battery cells 10 included in each cell group 10G face the same side in the X direction. The positive electrode tab 112 and negative electrode tab 114 extending from one cell group 10G adjacent in the Y direction and the positive electrode tab 112 and negative electrode tab 114 extending from the other cell group 10G adjacent in the Y direction face opposite sides in the X direction. Two adjacent cell groups 10G in the Y direction include a tab group 110 located in front of or behind the two cell groups 10G. The tab group 110 includes a positive electrode tab 112 and a negative electrode tab 114 that are joined together. The positive electrode tab 112 and the negative electrode tab 114 included in the tab group 110 are joined together, for example, by laser welding. As a result, the multiple tab groups 110 located in front of the cell stack 10S are arranged differently from the multiple tab groups 110 located in the rear of the cell stack 10S.

[0050] The structure of the cell stack 10S is not limited to the above example. For example, each cell group 10G may include three or more battery cells 10 connected in parallel. Alternatively, multiple single battery cells 10 may be connected in series, from a battery cell 10 at one end in the Y direction to a battery cell 10 at the other end in the Y direction.

[0051] The container 20 houses the cell stack 10S. The container 20 includes a front panel 210, a rear panel 220, a right panel 230, a left panel 240, a lower panel 250, and an upper panel 260. The front panel 210, the rear panel 220, the right panel 230, the left panel 240, the lower panel 250, and the upper panel 260 cover the front, rear, right, left, lower, and upper sides of the cell stack 10S, respectively. A thermally conductive adhesive 252 is disposed between the cell stack 10S and the lower panel 250.

[0052] As reference Figure 5 As described in detail later, a first protective tape 136a and a second protective tape 136b are respectively provided at the lower and upper ends of the exterior member 120 of the battery cell 10 located at the rightmost end of the cell stack 10S. Similarly, a third protective tape 136c and a fourth protective tape 136d are respectively provided at the lower and upper ends of the exterior member 120 of the battery cell 10 located at the leftmost end of the cell stack 10S.

[0053] Next, refer to Figure 2 as well as Figure 3 , refer to Figure 1 as well as Figure 4 , each battery cell 10 will be described.

[0054] like Figure 3 As shown, the exterior member 120 includes an upper exterior member 122 and a lower exterior member 124. The upper exterior member 122 covers the upper portion of the battery element 100. The lower exterior member 124 covers the lower portion of the battery element 100. The outer peripheral portions of the upper exterior member 122 and the lower exterior member 124 around the battery element 100 in the Y direction are joined to each other by, for example, heat welding. Figure 2 As shown, a left seal edge 126 a , a right seal edge 126 b , a front seal edge 126 c , and a rear seal edge 126 d are formed on the outer periphery of the upper and lower exterior members 122 and 124 around the battery element 100 in the Y direction.

[0055] like Figure 3 As shown, when viewed from the X direction, the left sealing edge 126a is bent into a predetermined bent shape. Specifically, when viewed from the X direction, the left sealing edge 126a is bent toward the left side of the upper exterior member 122. Furthermore, when viewed from the X direction, the front end of the left sealing edge 126a is bent toward the space created between the left sealing edge 126a and the left side of the upper exterior member 122 by the bending of the left sealing edge 126a. Figure 3 In the example shown, by bending the left sealing edge 126a toward the left side of the upper exterior member 122, the left sealing edge 126a can be prevented from protruding to the left. In addition, by bending the front end of the left sealing edge 126a toward the above-mentioned space, the front end of the left sealing edge 126a can be prevented from protruding upward. However, the bending shape of the left sealing edge 126a is not limited to Figure 3 In the example shown, the right seal edge 126b is also bent into a predetermined bent shape in the same manner as the left seal edge 126a.

[0056] The left-bend fixing body 132a fixes the bent shape of the left sealing edge 126a. In the embodiment, the left-bend fixing body 132a is a belt. For example, the left-bend fixing body 132a can be an insulating belt such as a resin belt. Figure 3In the example shown, left-bend fixing body 132a extends from the left end of upper exterior member 122 to the left end of lower exterior member 124, covering left seal edge 126a. Therefore, even if a restoring force acts on left seal edge 126a, the bent shape of left seal edge 126a is prevented from returning to its original shape. Similarly to left-bend fixing body 132a, right-bend fixing body 132b fixes the bent shape of right seal edge 126b.

[0057] like Figure 2 As shown, multiple left-bent fixing bodies 132a are provided separately from one another on the left sealing edge 126a. That is, the left-bent fixing bodies 132a are provided locally on the left sealing edge 126a. Therefore, compared to a case where the left-bent fixing bodies 132a are provided throughout the entire left sealing edge 126a, heat dissipation from the battery cells 10 is more effectively maintained.

[0058] like Figure 2 As shown, a plurality of right-hand bent fixing bodies 132b are provided separately from each other on the right-hand sealed edge 126b. That is, the right-hand bent fixing body 132b is provided locally on the right-hand sealed edge 126b. Therefore, compared with a case where the right-hand bent fixing body 132b is provided throughout the entire right-hand sealed edge 126b, the heat dissipation of the battery cell 10 can be ensured. For example, in the embodiment, compared with a case where the right-hand bent fixing body 132b is provided throughout the entire right-hand sealed edge 126b, the contact area between the right-hand sealed edge 126b and the thermally conductive adhesive 252 can be increased. Therefore, in the embodiment, compared with a case where the right-hand bent fixing body 132b is provided throughout the entire right-hand sealed edge 126b, the heat dissipation of the battery cell 10 can be improved.

[0059] From the perspective of fixing the bent shape of the left seal 126a, it is preferable that at least one left-bent fixing body 132a be provided with a length of 15% or more of the entire length of the left seal 126a in the X direction.

[0060] To ensure heat dissipation of the battery cell 10, it is preferable that at least one left-bent fixing body 132a be provided with a length that is 30% or less of the total length of the left sealing edge 126a in the X direction.

[0061] like Figure 4As shown, on the left side of the battery element 100, a plurality of left-side stacking fixing bodies 134a are provided, separated from each other. Similarly, on the right side of the battery element 100, a plurality of right-side stacking fixing bodies 134b are provided, separated from each other. In the embodiment, each left-side stacking fixing body 134a and each right-side stacking fixing body 134b is a tape. For example, each left-side stacking fixing body 134a and each right-side stacking fixing body 134b can be an insulating tape such as a resin tape. Each left-side stacking fixing body 134a and each right-side stacking fixing body 134b secures the stacked shape of the positive electrode 102, the negative electrode 104, and the separator 106.

[0062] like Figure 2 As shown, the left bent fixing body 132a and the left stacked fixing body 134a are staggered along the left sealing edge 126a. Figure 2 In the example shown, neither left-bent fixing body 132a nor left-stack fixing body 134a overlaps in the Y direction. Therefore, the Y-direction thickness of the battery cell 10 can be reduced compared to a case where the left-bent fixing body 132a and the right-bent fixing body 132b overlap in the Y direction. However, the left-bent fixing body 132a and the left-stack fixing body 134a may also overlap in the Y direction. Similarly to the left-bent fixing body 132a and the left-stack fixing body 134a, the right-bent fixing body 132b and the right-stack fixing body 134b are also staggered along the right sealing edge 126b.

[0063] exist Figure 1 In the example shown, the left-bending fixing bodies 132a provided on each battery cell 10 are arranged at positions that are substantially consistent in the X direction. Therefore, compared to a case where the left-bending fixing bodies 132a are provided at different positions for each battery cell 10, the mass production of the battery cells 10 can be improved. However, the left-bending fixing bodies 132a provided on each battery cell 10 may also be arranged staggered in the X direction. For example, by staggering the left-bending fixing bodies 132a provided on battery cells 10 adjacent to each other in the Y direction in the X direction, the thickness of the cell stack 10S in the Y direction can be reduced compared to a case where these left-bending fixing bodies 132a are aligned in the X direction. The above-mentioned matters regarding the left-bending fixing bodies 132a also apply to the right-bending fixing bodies 132b.

[0064] Next, refer to Figure 5 , refer to Figure 1 The battery cell 10 located at the rightmost end of the cell stack 10S will be described. In the following description, unless otherwise specified, the Z direction with respect to the battery cell 10 is the left-right direction.

[0065] The first protective tape 136a covers the entire right sealing edge 126b. The first protective tape 136a is heat-resistant. Therefore, the first protective tape 136a acts as a heat-resistant body to protect the right sealing edge 126b. For example, the welding of the lower end of the right plate 230 and the right end of the lower plate 250 may generate relatively high temperatures around the right sealing edge 126b. In this embodiment, the first protective tape 136a protects the right sealing edge 126b from the effects of this heat. Thus, the effects of this heat on the sealing performance of the right sealing edge 126b can be suppressed.

[0066] The heat resistance of the first protective tape 136a is determined, for example, by the material it is made of and its thickness. For example, the first protective tape 136a is made of a resin such as PET (polyethylene terephthalate) or PP (polypropylene). In this example, the first protective tape 136a has a thickness of, for example, 0.1 mm or greater. In this case, the first protective tape 136a can function as a heat-resistant material. Alternatively, the first protective tape 136a may be made of a resin with a higher heat resistance than PET or PP. For example, polyimide can be used as such. In this example, the thickness of the first protective tape 136a may also be less than 0.1 mm.

[0067] Furthermore, the heat-resistant temperature of the first protective tape 136a can be lower than the heat-resistant temperature of the outermost layer of the exterior member 120. The outermost layer of the exterior member 120 may contain, for example, PET or nylon. For example, even if relatively high temperatures are generated around the right sealing edge 126b due to the aforementioned welding, this heat generation lasts for a relatively short period of time. Therefore, the first protective tape 136a only needs to be able to withstand this short period of heat. Therefore, the heat-resistant temperature of the first protective tape 136a does not necessarily need to be higher than the heat-resistant temperature of the outermost layer of the exterior member 120. However, the heat-resistant temperature of the first protective tape 136a may also be higher than the heat-resistant temperature of the outermost layer of the exterior member 120.

[0068] The front end of the first protective tape 136a is located further forward than the front end of the right sealing edge 126b. Thus, the front end of the first protective tape 136a covers at least a portion of the front end of the right sealing edge 126b. Therefore, the front end of the right sealing edge 126b can be protected from the aforementioned heat by the first protective tape 136a. The first protective tape 136a may also have insulating properties. Sometimes, a conductor such as an aluminum sheet included in the exterior component 120 is exposed from the front end of the right sealing edge 126b. By covering at least a portion of the front end of the right sealing edge 126b with the insulating first protective tape 136a, a short circuit between the conductor of the exterior component 120 and the container 20, such as the right plate 230, can be suppressed.

[0069] The rear end of the first protective tape 136a is located further back than the rear end of the right sealing edge 126b. Thus, the rear end of the first protective tape 136a covers at least a portion of the rear end of the right sealing edge 126b. Therefore, the rear end of the right sealing edge 126b can be protected from the aforementioned heat by the first protective tape 136a. The second protective tape 136b may also have insulating properties. Sometimes, a conductor such as an aluminum sheet included in the exterior component 120 is exposed from the rear end of the right sealing edge 126b. By covering at least a portion of the rear end of the right sealing edge 126b with the insulating second protective tape 136b, a short circuit between the conductor of the exterior component 120 and the container 20 such as the right plate 230 can be suppressed.

[0070] The first protective tape 136a fixes the bent shape of the right seal 126b in the same manner as the right bent fixing body 132b. Therefore, the first protective tape 136a also serves as a fixing body for fixing the bent shape of the right seal 126b.

[0071] The shape of the first protective tape 136a is not limited to Figure 5 For example, the position where the first guard band 136a is provided can be changed as appropriate depending on the function of the first guard band 136a.

[0072] For example, let's describe the case where the first protective tape 136a has heat resistance. In this example, if multiple welds are intermittently arranged along the X-direction between the lower end of the right plate 230 and the right end of the lower plate 250, multiple first protective tapes 136a can be intermittently arranged along the right sealing edge 126b to correspond to these welds. This allows the first protective tapes 136a to protect the right sealing edge 126b from the heat generated by the welds. In this example, as described above, the first protective tape 136a not only has heat resistance but also has insulating properties.

[0073] The following describes a case where the first protective tape 136a has insulating properties. In this example, the first protective tape 136a may cover only the front end of the right sealing edge 126b. Alternatively, the first protective tape 136a may cover only the rear end of the right sealing edge 126b. Alternatively, the first protective tape 136a may cover only the front and rear ends of the right sealing edge 126b. This, as described above, can prevent short circuits between the conductors of the exterior component 120 and the housing 20, such as the right plate 230. In these examples, as described above, the first protective tape 136a may not only have insulating properties but also be heat-resistant.

[0074] The second protective tape 136b, like the first protective tape 136a, covers the entire left sealing edge 126a. Like the front end of the first protective tape 136a, the front end of the second protective tape 136b protrudes forward from the front end of the left sealing edge 126a. Like the rear end of the first protective tape 136a, the rear end of the second protective tape 136b protrudes rearward from the rear end of the left sealing edge 126a. For example, welding the upper end of the right plate 230 to the right end of the upper plate 260 may generate relatively high temperatures around the left sealing edge 126a. In an embodiment, the second protective tape 136b can protect the left sealing edge 126a from the effects of this heat. Therefore, the effects of this heat on the sealing properties of the left sealing edge 126a can be suppressed. However, like the shape of the first protective tape 136a, the shape of the second protective tape 136b is not limited to this example.

[0075] The above-described structure of the battery cell 10 located at the rightmost end of the cell stack 10S can also be applied to the structure of the battery cell 10 located at the leftmost end of the cell stack 10S. For example, due to the welding of the lower end of the left plate 240 and the left end of the lower plate 250, relatively high temperatures may be generated around the right sealed edge 126b of the battery cell 10 located at the leftmost end of the cell stack 10S. In an embodiment, the right sealed edge 126b of this battery cell 10 can be protected from this heat by the third protective tape 136c. Similarly, for example, due to the welding of the upper end of the left plate 240 and the left end of the upper plate 260, relatively high temperatures may be generated around the left sealed edge 126a of the battery cell 10 located at the leftmost end of the cell stack 10S. In an embodiment, the left sealed edge 126a of this battery cell 10 can be protected from this heat by the fourth protective tape 136d.

[0076] The protective tape can also be applied to battery cells 10 other than the leftmost and rightmost battery cells 10 in the battery stack 10S. Specifically, the protective tape can be applied to at least one of the left sealing edge 126a and the right sealing edge 126b of the exterior member 120 of at least one battery cell 10 included in the battery stack 10S.

[0077] The heat-resistant material covering at least a portion of the sealing edge of exterior member 120 is not limited to a protective tape. The heat-resistant material may also be, for example, a liquid or gel-like substance having both heat resistance and insulating properties. In this example, the material may be applied to at least a portion of the sealing edge and allowed to solidify. Alternatively, the heat-resistant material may be a foam such as sponge.

[0078] In the embodiment, the protective tape protects the sealed edge of the exterior member 120 from heat generated by welding portions of the container 20. However, the protective tape may also protect the sealed edge of the exterior member 120 from heat different from heat generated by welding portions of the container 20.

[0079] As mentioned above, although embodiment of this invention was described with reference to drawings, these are illustrations of this invention, and various structures other than the above-mentioned can also be adopted.

[0080] For example, in the embodiment, the exterior member 120 is formed by thermally fusing two exterior members, an upper exterior member 122 and a lower exterior member 124. However, a single sheet of exterior member 120 may be wrapped around the battery element 100 in the X direction. In this case, a sealed edge of the exterior member 120 is formed on the left or right side of the battery element 100. In this example, a bent fixing body for securing the sealed edge may be partially provided on the sealed edge, similar to the embodiment.

[0081] This application claims the benefit of priority based on Japanese Patent Application No. 2022-113839, filed on July 15, 2022, and Japanese Patent Application No. 2022-113840, filed on July 15, 2022, the disclosures of which are incorporated herein by reference in their entirety.

[0082] -Description of Reference Numerals-

[0083] 1: Battery module, 10: Battery cell, 10G: Cell group, 10S: Cell stack, 12: Compression pad, 20: Container, 100: Battery element, 102: Positive electrode, 102a: Positive electrode current collector, 104: Negative electrode, 104a: Negative electrode current collector, 106: Separator, 110: Tab group, 112: Positive electrode tab, 114: Negative electrode tab, 120: External component, 122: Upper external component, 124: Lower external component, 126a: Left sealing edge, 126b: Right sealing edge, 126c: front sealing edge, 126d: rear sealing edge, 132a: left bent fixing body, 132b: right bent fixing body, 134a: left stacking fixing body, 134b: right stacking fixing body, 136a: first protective tape, 136b: second protective tape, 136c: third protective tape, 136d: fourth protective tape, 210: front plate, 220: rear plate, 230: right plate, 240: left plate, 250: lower plate, 252: thermally conductive adhesive, 260: upper plate.

Claims

1. A battery cell, characterized in that: have: Battery elements; an exterior component that houses the battery element; and The heat-resistant body covers at least a portion of the sealing edge of the exterior member.

2. The battery cell according to claim 1, wherein: The sealing edge is bent into a given bending shape, The heat-resistant body fixes the bent shape of the sealing edge.

3. The battery cell according to claim 1, wherein: The heat-resistant body has insulating properties, The heat-resistant body covers at least a portion of at least one of the two ends of the sealing edge.

4. The battery cell according to claim 2, wherein: The heat-resistant body has insulating properties, The heat-resistant body covers at least a portion of at least one of the two ends of the sealing edge.

5. A battery module, characterized in that: A plurality of battery cells are stacked in a given direction. The battery cell according to any one of claims 1 to 4 is arranged at least on one of both ends of the plurality of battery cells in the given direction.

6. A battery cell, characterized in that: have: Battery elements; an exterior member having a sealing edge bent into a given bent shape and accommodating the battery element; and a first fixing body, fixing the bending shape of the sealing edge, The first fixing body is partially disposed on the sealing edge.

7. The battery cell according to claim 6, wherein: The device further comprises: a second fixing body for fixing the stacked shape of the positive electrode, the negative electrode and the separator included in the battery element; The first fixing body and the second fixing body are arranged staggered with each other along the sealing edge.

8. A battery module, characterized in that: A battery cell according to claim 6 or 7 is provided which is electrically connected to each other.

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