Battery cells and battery modules

Abstract

To fix a folded shape of a sealing side of an exterior material in a state of securing heat dissipation of a battery cell.SOLUTION: The battery cell 10 includes battery elements 100, an exterior material 120 having a left sealing side 126a bent in a predetermined bent shape and housing the battery elements 100, and a left bent fixing body 126a for fixing the bent shape of the left sealing side 132a. The left folding fixing body 132a is partially provided on the left sealing side 126a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[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 material. The exterior material includes an upper exterior material that covers the upper part of the battery element and a lower exterior material that covers the lower part of the battery element. A sealed edge is formed on the exterior material by thermally fusing the upper and lower exterior materials. In the battery cell described in Patent Document 1, the sealed edge that runs along the longitudinal direction of the battery element is folded into a predetermined folded shape. A tape is provided on the sealed edge to fix the folded shape of the sealed edge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2018-521481 Summary of the Invention [Problem to be solved by the invention]

[0004] In the battery cell described in Patent Document 1, a tape that fixes the folded shape of the sealed edge is provided along the entire sealed edge. However, if the tape is provided along the entire sealed edge, it may be difficult to ensure the heat dissipation of the battery cell. On the other hand, if the tape is not provided, it may be difficult to maintain the folded shape of the sealed edge.

[0005] One example of an object of the present invention is to fix the folded shape of the sealing edge of the exterior material while ensuring heat dissipation from the battery cell. Other objects of the present invention will become apparent from the description of this specification. [Means for solving the problem]

[0006] One aspect of the present invention is as follows. [1] A battery element; an exterior material having a sealing edge bent into a predetermined bent shape and accommodating the battery element; a first fixing body that fixes the bent shape of the sealing side; Equipped with The battery cell, wherein the first fixing body is partially provided on the sealing edge. [2] The battery element further includes a second fixing body that fixes the stacked shape of the positive electrode, the negative electrode, and the separator included in the battery element, The battery cell according to [1], wherein the first fixed body and the second fixed body are arranged offset from each other along the sealing edge. [3] A battery module comprising a plurality of battery cells according to [1] or [2], electrically connected to each other. [Effects of the Invention]

[0007] According to the above aspect of the present invention, the folded shape of the sealing edge of the exterior material can be fixed while ensuring heat dissipation from the battery cell. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is an exploded perspective view of the battery module according to the embodiment. [Figure 2] FIG. 2 is a top view of a battery cell according to the embodiment. [Figure 3] FIG. 2 is a front view of the battery cell according to the embodiment. [Figure 4] FIG. 2 is a perspective view of a battery element according to an embodiment. [Figure 5] FIG. 2 is a diagram illustrating a battery cell located at the rightmost end of a cell stack according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, similar components are designated by similar reference numerals, and the description thereof will be omitted as appropriate.

[0010] FIG. 1 is an exploded perspective view of a battery module 1 according to an embodiment. FIG. 2 is a top view of a battery cell 10 according to an embodiment. FIG. 3 is a front view of the battery cell 10 according to an embodiment. FIG. 4 is a perspective view of a battery element 100 according to an embodiment. FIG. 5 is a diagram for explaining the battery cell 10 located at the rightmost end of a cell stack 10S according to an embodiment. For the sake of explanation, the positive electrode tab 112 and the negative electrode tab 114 are not shown in FIG. 3.

[0011] For the sake of explanation, each figure is labeled with an X direction, a Y direction, and a Z direction.

[0012] In FIG. 1 , the X direction, Y direction, and Z direction are as follows: The X direction indicates the front-rear direction of the battery module 1. The Y direction is perpendicular to the X direction. The Y direction indicates the left-right direction of the battery module 1. The Z direction is perpendicular 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 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 rearward, leftward, and upward directions, respectively. However, the relationships between the X direction, Y direction, Z direction, front-rear direction, left-right direction, and up-down direction of the battery module 1 are not limited to this example.

[0013] 2 to 5, the X, Y, and Z directions are as follows: The X direction indicates the front-rear 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 and Y directions. The Z direction indicates the left-right direction of the battery cell 10. The directions 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 rearward, downward, and leftward, respectively. That is, in FIG. 1, each battery cell 10 is arranged such that the left-right and up-down directions of the battery cell 10 are approximately parallel to the up-down and up-down directions of the battery module 1, respectively. However, the relationships between the X direction, Y direction, Z direction, front-rear direction, left-right direction, and up-down directions of the battery cell 10 are not limited to this example.

[0014] The white circle with an X indicating the X, Y or Z direction indicates that the direction from the front of the paper to the back is the direction indicated by the arrow indicating that direction.

[0015] The battery module 1 will be described with reference to FIG. 1 and, if necessary, FIG.

[0016] The battery module 1 includes a cell stack 10S and a container 20.

[0017] The cell stack 10S includes a plurality of battery cells 10 and a plurality of compression pads 12. The plurality of battery cells 10 and the plurality of compression pads 12 are alternately stacked in the Y direction. The longitudinal direction of each battery cell 10 is approximately parallel to the X direction. The lateral direction of each battery cell 10 is approximately parallel to the Z direction. The thickness direction of each battery cell 10 is approximately parallel to the Y direction. Note that the shape of each battery cell 10 is not limited to this example.

[0018] As shown in FIGS. 1 and 4, each battery cell 10 includes a battery element 100, a positive electrode tab 112, a negative electrode tab 114, and an exterior material 120.

[0019] As shown in FIG. 4 , the battery element 100 includes a laminate of multiple positive electrodes 102, multiple negative electrodes 104, and multiple separators 106. The multiple positive electrodes 102 and multiple negative electrodes 104 are alternately stacked in the Y direction. Each separator 106 is located between adjacent positive electrodes 102 and negative electrodes 104 in the Y direction. However, the structure of the battery element 100 is not limited to this example. The battery element 100 may include a laminate of at least one positive electrode 102, at least one negative electrode 104, and at least one separator 106. For example, a single sheet-like separator 106 may be folded back alternately at both ends in the Z direction to form a zigzag shape. In this example, the portion of the separator 106 located between the folds at both ends in the Z direction is located between the positive electrodes 102 and negative electrodes 104 adjacent in the Y direction.

[0020] As shown in Fig. 4, 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 drawn from the plurality of positive electrodes 102 of the battery element 100. The negative electrode tab 114 is electrically connected to the negative electrodes 104 of the battery element 100 via a plurality of negative electrode current collectors 104a drawn from the plurality of negative electrodes 104 of the battery element 100. In the example shown in Fig. 4, the positive electrode tab 112 is drawn toward the front of the battery element 100. The negative electrode tab 114 is drawn toward the rear of the battery element 100.

[0021] The exterior material 120 accommodates the battery element 100 and an electrolyte solution (not shown).

[0022] In the 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 the embodiment, each cell group 10G includes two battery cells 10 adjacent to each other in the Y direction. Two positive electrode tabs 112 drawn from the two battery cells 10 included in each cell group 10G face the same side in the X direction. Two negative electrode tabs 114 drawn 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 the negative electrode tab 114 drawn from one of the cell groups 10G adjacent to each other in the Y direction face opposite each other in the X direction. Two cell groups 10G adjacent to each other in the Y direction include tab groups 110 located in front of or behind the two cell groups 10G. The tab groups 110 include positive electrode tabs 112 and negative electrode tabs 114 joined to each other. The positive electrode tabs 112 and negative electrode tabs 114 included in the tab groups 110 are joined to each other by, for example, laser welding. As a result, the multiple tab groups 110 located in front of the cell stack 10S and the multiple tab groups 110 located in the rear of the cell stack 10S are arranged alternately.

[0023] The configuration 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 located at one end in the Y direction to a battery cell 10 located at the other end in the Y direction.

[0024] The housing 20 houses the cell stack 10S. The housing 20 has a front plate 210, a rear plate 220, a right plate 230, a left plate 240, a lower plate 250, and an upper plate 260. The front plate 210, the rear plate 220, the right plate 230, the left plate 240, the lower plate 250, and the upper plate 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 plate 250.

[0025] As will be described in detail later with reference to Figure 5, a first protective tape 136a and a second protective tape 136b are provided at the bottom and top ends of the exterior packaging material 120 of the rightmost battery cell 10 in the cell stack 10S. Similarly, a third protective tape 136c and a fourth protective tape 136d are provided at the bottom and top ends of the exterior packaging material 120 of the leftmost battery cell 10 in the cell stack 10S.

[0026] Next, each battery cell 10 will be described with reference to FIGS. 2 and 3, and also with reference to FIGS. 1 and 4 as necessary.

[0027] As shown in Fig. 3, the exterior material 120 has an upper exterior material 122 and a lower exterior material 124. The upper exterior material 122 covers the upper part of the battery element 100. The lower exterior material 124 covers the lower part of the battery element 100. The outer peripheral portions of the upper exterior material 122 and the lower exterior material 124 around the Y direction of the battery element 100 are joined to each other by, for example, heat fusion. As a result, as shown in Fig. 2, a left sealed edge 126a, a right sealed edge 126b, a front sealed edge 126c, and a rear sealed edge 126d are formed in the outer peripheral portions of the upper exterior material 122 and the lower exterior material 124 around the Y direction of the battery element 100.

[0028] As shown in FIG. 3 , the left sealed edge 126a is bent in a predetermined shape when viewed from the X direction. Specifically, when viewed from the X direction, the left sealed edge 126a is bent toward the left side surface of the upper exterior material 122. Furthermore, when viewed from the X direction, the tip of the left sealed edge 126a is bent toward the space created between the left sealed edge 126a and the left side surface of the upper exterior material 122 by the bending of the left sealed edge 126a. In the example shown in FIG. 3 , bending the left sealed edge 126a toward the left side surface of the upper exterior material 122 can prevent the left sealed edge 126a from protruding leftward. Furthermore, bending the tip of the left sealed edge 126a toward the above-mentioned space can prevent the tip of the left sealed edge 126a from protruding upward. However, the bent shape of the left sealed edge 126a is not limited to the example shown in FIG. 3 . The right sealing edge 126b is also bent into a predetermined shape in the same manner as the left sealing edge 126a.

[0029] The left bending fixing body 132a fixes the bending shape of the left sealing edge 126a. In the embodiment, the left bending fixing body 132a is a tape. For example, the left bending fixing body 132a can be an insulating tape such as a resin tape. In the example shown in FIG. 3, the left bending fixing body 132a extends from the left end portion of the upper exterior material 122 to the left end portion of the lower exterior material 124 so as to cover the left sealing edge 126a. Therefore, even if a restoring force acts on the left sealing edge 126a, the bending shape of the left sealing edge 126a can be prevented from returning to its original shape. The right bending fixing body 132b also fixes the bending shape of the right sealing edge 126b in the same manner as the left bending fixing body 132a.

[0030] 2, multiple left bending fixing bodies 132a are provided spaced apart from one another on the left sealing edge 126a. That is, the left bending fixing bodies 132a are provided partially on the left sealing edge 126a. This ensures better heat dissipation from the battery cells 10 than when the left bending fixing bodies 132a are provided over the entire left sealing edge 126a.

[0031] As shown in FIG. 2 , multiple right-side bend fixing bodies 132b are provided spaced apart from one another on the right sealing edge 126b. That is, the right-side bend fixing bodies 132b are provided partially on the right sealing edge 126b. Therefore, the heat dissipation of the battery cell 10 can be ensured more effectively than when the right-side bend fixing bodies 132b are provided over the entire right sealing edge 126b. For example, in the embodiment, the contact area between the right sealing edge 126b and the thermally conductive adhesive 252 can be increased more effectively than when the right-side bend fixing bodies 132b are provided over the entire right sealing edge 126b. Therefore, in the embodiment, the heat dissipation of the battery cell 10 can be improved more effectively than when the right-side bend fixing bodies 132b are provided over the entire right sealing edge 126b.

[0032] From the viewpoint of fixing the bent shape of the left sealing edge 126a, it is preferable that at least one left bending fixing body 132a is provided over a length of at least 15% of the entire left sealing edge 126a in the X direction. The same applies to the right bending fixing body 132b.

[0033] From the perspective of ensuring heat dissipation from the battery cell 10, it is preferable that at least one left bending and fixing body 132a be provided over a length that is 30% or less of the entire length of the left sealing edge 126a in the X direction. The same applies to the right bending and fixing body 132b.

[0034] As shown in FIG. 4 , a plurality of left laminated fixtures 134a are provided spaced apart from one another on the left side of the battery element 100. Similarly, a plurality of right laminated fixtures 134b are provided spaced apart from one another on the right side of the battery element 100. In this embodiment, each of the left laminated fixtures 134a and each of the right laminated fixtures 134b is a tape. For example, each of the left laminated fixtures 134a and each of the right laminated fixtures 134b can be an insulating tape such as a resin tape. Each of the left laminated fixtures 134a and each of the right laminated fixtures 134b fixes the stacked shape of the positive electrode 102, the negative electrode 104, and the separator 106.

[0035] As shown in FIG. 2, the left bending fixed body 132a and the left stack fixed body 134a are arranged offset from each other along the left sealing edge 126a. In the example shown in FIG. 2, none of the left bending fixed bodies 132a overlaps with any of the left stack fixed bodies 134a in the Y direction. Therefore, the thickness of the battery cell 10 in the Y direction can be made thinner than when the left bending fixed body 132a and the right bending fixed body 132b overlap in the Y direction. However, the left bending fixed body 132a and the left stack fixed body 134a may also overlap in the Y direction. The right bending fixed body 132b and the right stack fixed body 134b are also arranged offset from each other along the right sealing edge 126b, similar to the left bending fixed body 132a and the left stack fixed body 134a.

[0036] 1, the left bending fixing bodies 132a provided on each battery cell 10 are arranged at approximately the same position 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, mass production of the battery cells 10 is improved. However, the left bending and fixing bodies 132a provided on each battery cell 10 may be arranged offset from one another in the X direction. For example, by arranging the left bending and fixing bodies 132a provided on each of the battery cells 10 adjacent to one another in the Y direction offset from one another in the X direction, the thickness of the cell stack 10S in the Y direction can be made thinner than when these left bending and fixing bodies 132a are aligned in the X direction. The matters described above regarding the left bending and fixing body 132a also apply to the right bending and fixing body 132b.

[0037] Next, the battery cell 10 located at the rightmost end of the cell stack 10S will be described with reference to Fig. 5, and if necessary, Fig. 1. In the following description, unless otherwise specified, the Z direction is the left-right direction with respect to the battery cell 10.

[0038] 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 serves as a heat-resistant body that protects the right sealing edge 126b. For example, welding of the lower end of the right plate 230 to the right end of the lower plate 250 may generate relatively high temperatures around the right sealing edge 126b. In this embodiment, the right sealing edge 126b can be protected from the heat by the first protective tape 136a. This reduces the effect of the heat on the sealing performance of the right sealing edge 126b.

[0039] The heat resistance of the first protective tape 136a is determined by, for example, the material constituting the first protective tape 136a and the thickness of the first protective tape 136a. 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 more. 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 having higher heat resistance than that of PET or PP. An example of such a resin is polyimide. In this example, the thickness of the first protective tape 136a may be less than 0.1 mm.

[0040] The heat resistance temperature of the first protective tape 136a may be lower than the heat resistance temperature of the outermost layer of the exterior packaging material 120. The outermost layer of the exterior packaging material 120 may be made of, for example, PET or nylon. For example, even if relatively high temperatures are generated around the right sealing edge 126b due to the above-mentioned welding, the time period for which this heat is generated is relatively short. Therefore, it is sufficient for the first protective tape 136a to be able to withstand the heat for that short period of time. Therefore, the heat resistance temperature of the first protective tape 136a does not necessarily need to be higher than the heat resistance temperature of the outermost layer of the exterior packaging material 120. However, the heat resistance temperature of the first protective tape 136a may be higher than the heat resistance temperature of the outermost layer of the exterior packaging material 120.

[0041] The front end of the first protective tape 136a is located forward of the front end of the right sealing edge 126b. As a result, 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 heat by the first protective tape 136a. The first protective tape 136a may be insulating. A conductor, such as an aluminum sheet, included in the exterior packaging material 120 may be exposed from the front end of the right sealing edge 126b. Covering at least a portion of the front end of the right sealing edge 126b with the insulating first protective tape 136a can prevent a short circuit between the conductor of the exterior packaging material 120 and the housing body 20, such as the right plate 230.

[0042] The rear end of the first protective tape 136a is located rearward of the rear end of the right sealing edge 126b. This allows the rear end of the first protective tape 136a to cover 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 heat by the first protective tape 136a. The second protective tape 136b may be insulating. A conductor, such as an aluminum sheet, included in the exterior packaging material 120 may be exposed from the rear end of the right sealing edge 126b. Covering at least a portion of the rear end of the right sealing edge 126b with the insulating second protective tape 136b can prevent a short circuit between the conductor of the exterior packaging material 120 and the housing body 20, such as the right plate 230.

[0043] The first protective tape 136a fixes the bent shape of the right sealing edge 126b in the same manner as the right bending fixing body 132b, and therefore the first protective tape 136a also serves as a fixing body that fixes the bent shape of the right sealing edge 126b.

[0044] The shape of the first protective tape 136a is not limited to the example shown in Fig. 5. For example, the position where the first protective tape 136a is provided can be changed as appropriate depending on the function of the first protective tape 136a.

[0045] For example, a case will be described in which the first protective tape 136a has heat resistance. In this example, if multiple welds between the lower end of the right plate 230 and the right end of the lower plate 250 are arranged intermittently along the X direction, multiple first protective tapes 136a may be arranged intermittently along the right sealing edge 126b to correspond to the multiple welds. This allows the right sealing edge 126b to be protected from heat generated at each weld by each first protective tape 136a. In this example, the first protective tape 136a may have not only heat resistance but also insulation, as described above.

[0046] A case where the first protective tape 136a has insulating properties will be described. 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 makes it possible to prevent a short circuit between the conductors of the exterior material 120 and the housing 20, such as the right plate 230, as described above. In these examples, the first protective tape 136a may have not only insulating properties but also heat resistance, as described above.

[0047] The second protective tape 136b, like the first protective tape 136a, covers the entire left sealing edge 126a. The front end of the second protective tape 136b protrudes forward from the front end of the left sealing edge 126a, like the front 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, like the rear end of the first protective tape 136a. For example, welding the upper end of the right plate 230 to the right end of the upper plate 260 may generate relatively high heat around the left sealing edge 126a. In this embodiment, the second protective tape 136b can protect the left sealing edge 126a from the heat. This reduces the impact of the heat on the sealing performance of the left sealing edge 126a. However, like the shape of the first protective tape 136a, the shape of the second protective tape 136b is not limited to this example.

[0048] 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, welding the lower end of the left plate 240 to the left end of the lower plate 250 can generate relatively high heat around the right sealing edge 126b of the battery cell 10 located at the leftmost end of the cell stack 10S. In this embodiment, the third protective tape 136c can protect the right sealing edge 126b of the battery cell 10 from this heat. Similarly, welding the upper end of the left plate 240 to the left end of the upper plate 260 can generate relatively high heat around the left sealing edge 126a of the battery cell 10 located at the leftmost end of the cell stack 10S. In this embodiment, the fourth protective tape 136d can protect the left sealing edge 126a of the battery cell 10 from this heat.

[0049] The protective tape can also be applied to battery cells 10 other than the battery cells 10 located at the leftmost and rightmost ends of the cell stack 10S. In other words, the protective tape may be applied to at least one of the left sealing edge 126a and the right sealing edge 126b of the exterior packaging material 120 of at least one battery cell 10 included in the cell stack 10S.

[0050] The heat-resistant material covering at least a portion of the sealing edge of the exterior material 120 is not limited to protective tape. The heat-resistant material may be, for example, a liquid or gel-like material having heat resistance and insulating properties. In this example, the material may be applied to at least a portion of the sealing edge and then solidified. Alternatively, the heat-resistant material may be a foam such as a sponge.

[0051] In the embodiment, the protective tape protects the sealed edge of the outer casing 120 from heat generated by welding together the portions of the housing 20. However, the protective tape may also protect the sealed edge of the outer casing 120 from heat different from the heat generated by welding together the portions of the housing 20.

[0052] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0053] For example, in the embodiment, the exterior material 120 is formed by thermally fusing two exterior materials, an upper exterior material 122 and a lower exterior material 124. However, a single sheet-like exterior material 120 may be wrapped around the battery element 100 in the X direction. In this case, a sealed edge of the exterior material 120 is formed on the left or right side of the battery element 100. In this example, as in the embodiment, a fixing member that fixes the folded shape of the sealed edge may be partially provided on the sealed edge. [Explanation of symbols]

[0054] 1 Battery Module 10 battery cells 10G cell cluster 10S cell stack 12 compression pads 20 Containment Unit 100 Battery Elements 102 Positive electrode 102a Positive electrode current collector 104 Negative electrode 104a Negative electrode current collector 106 Separator 110 Tabs 112 Positive electrode tab 114 Negative electrode tab 120 Exterior materials 122 Upper exterior material 124 Lower exterior material 126a Left sealing side 126b Right sealing side 126c Front sealing side 126d Rear sealing side 132a Left bent fixed body 132b Right bent fixed body 134a Left laminated fixed body 134b Right laminated fixed body 136a First protective tape 136b Second protective tape 136c Third protective tape 136d 4th 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 element having a positive electrode, a negative electrode and a separator, An exterior material having a sealing edge folded into a predetermined folded shape, which houses the battery element, A first fixing body for fixing the folded shape of the sealing edge, A second fixing body that fixes the stacked shape of the positive electrode, the negative electrode, and the separator of the battery element, Equipped with, A battery cell in which the first and second fixing bodies are arranged so as not to overlap each other, but offset from each other along the sealing edge.

2. The battery cell according to claim 1, wherein the plurality of first fixing bodies and the plurality of second fixing bodies are arranged offset from each other along the sealing edge without overlapping each other.

3. The battery cell according to claim 1, wherein the first fixing body is partially provided on the sealing edge.

4. The sealing edge is located on one side of the battery element, The exterior material has another sealing edge that is bent into a predetermined folded shape on the other side opposite to the one side of the battery element. Another first fixing body for fixing the folded shape of the other sealing edge, A second fixing body that fixes the stacked shape of the positive electrode, negative electrode, and separator of the battery element, Furthermore, The battery cell according to claim 1, wherein the other first fixing body and the other second fixing body are arranged so as not to overlap with each other, but offset from each other along the other sealing edge.

5. The battery cell according to claim 1, wherein the first and second fixing bodies are tapes.

6. The battery cell according to claim 1, wherein the first and second fixing bodies are resin tapes.

7. A battery module comprising a plurality of battery cells according to any one of claims 1 to 6, which are electrically connected to one another.

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