Power storage cell

Abstract

To provide a power storage cell capable of increasing the stability of each cell unit.SOLUTION: A power storage cell includes: a first cell unit group 10 including a plurality of first cell units 101; and a second cell unit group 20 including a plurality of second cell units 102. Each of the cell units 101 and 102 includes: an electrode body; a laminate exterior body 160; a positive electrode collector terminal 141; and a negative electrode collector terminal 142. The pair of first cell units 101 has a first connection part, and the pair of second cell units 102 has a second connection part 143b. In the first cell unit group 10, the plurality of first connection parts are alternately arranged in a vertical direction along a first direction. In the second cell unit group 20, the plurality of second connection parts 143b are alternately arranged in the vertical direction along the first direction, and are arranged so as not to overlap with the respective first connection parts in the second direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage cell. [Background technology]

[0002] For example, JP 2023-509216 A discloses a battery including a first electrode assembly set including a plurality of electrode assemblies connected in series along a first direction, and a second electrode assembly set including a plurality of electrode assemblies connected in series along the first direction. The second electrode assembly set is adjacent to the first electrode assembly set in a second direction that is perpendicular to both the first direction and the vertical direction.

[0003] In the first electrode body set, the electrode lead members of a pair of adjacent electrode bodies are connected to each other by a first connecting member. In the second electrode body set, the electrode lead members of a pair of adjacent electrode bodies are also connected to each other by a first connecting member. In the first electrode body set, each first connecting member is provided on the lower part of each electrode body, and in the second electrode body set, each first connecting member is provided on the upper part of each electrode body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2023-509216 Summary of the Invention [Problem to be solved by the invention]

[0005] In the battery described in JP 2023-509216 A, the stability of each electrode assembly set is low. For example, in each electrode assembly in the first electrode assembly set, the upper part of the electrode assembly tends to rotate relative to the lower part around an axis connecting the multiple first connecting members aligned along the first direction.

[0006] An object of the present disclosure is to provide a storage cell that can improve the stability of each cell unit. [Means for solving the problem]

[0007] An energy storage cell according to one aspect of the present disclosure includes a first cell unit group including a plurality of first cell units lined up in a first direction, and a second cell unit group including a plurality of second cell units lined up in the first direction and arranged adjacent to the first cell unit group in a second direction perpendicular to both the first direction and the vertical direction, wherein each of the plurality of first cell units and the plurality of second cell units has an electrode assembly, a laminated exterior body that houses the electrode assembly, a positive electrode current collector terminal that protrudes from a position of the laminated exterior body on one side in the first direction and on one side in the vertical direction, and a negative electrode current collector terminal that protrudes from a position of the laminated exterior body on the other side in the first direction and on the other side in the vertical direction, and the first cell units and the second cell units are adjacent to each other in the first direction. A pair of first cell units have a first connection portion connecting the positive electrode collector terminal of one of the first cell units in the pair to the negative electrode collector terminal of the other of the first cell units, and a pair of second cell units adjacent to each other in the first direction have a second connection portion connecting the positive electrode collector terminal of one of the second cell units in the pair to the negative electrode collector terminal of the other of the second cell units, and in the first cell unit group, the first connection portions are arranged alternately up and down along the first direction, and in the second cell unit group, the second connection portions are arranged alternately up and down along the first direction and so as not to overlap with the first connection portions in the second direction. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a storage cell that can improve the stability of each cell unit. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view schematically illustrating a storage cell according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view of a first cell unit group and a second cell unit group. [Figure 3] FIG. 2 is a front view schematically showing a part of the storage cell. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 10A and 10B are diagrams schematically showing modified examples of the connecting member. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0011] Fig. 1 is a perspective view schematically showing a storage cell according to an embodiment of the present disclosure. Fig. 2 is a perspective view of a first cell unit group and a second cell unit group shown in Fig. 1. Fig. 3 is a front view schematically showing a portion of the storage cell. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. This storage cell 1 is mounted, for example, on the bottom of a vehicle.

[0012] 1 to 4, the energy storage cell 1 includes a first cell unit group 10, a second cell unit group 20, a covering sheet 200 (see FIGS. 5 and 6), a cell case 300, an external terminal 400, a connecting member 500, and a covering member 600. Note that the covering sheet 200 is not shown in FIG. 2.

[0013] The first cell unit group 10 includes a plurality of first cell units 101. In this embodiment, the first cell unit group 10 includes four first cell units 101. However, the number of first cell units 101 is not limited to four. The plurality of first cell units 101 are lined up along a first direction. A pair of first cell units 101 adjacent to each other in the first direction are connected to each other.

[0014] The second cell unit group 20 includes a plurality of second cell units 102. In this embodiment, the second cell unit group 20 includes four second cell units 102. However, the number of second cell units 102 is not limited to four. The plurality of second cell units 102 are lined up along a first direction. A pair of second cell units 102 adjacent to each other in the first direction are connected to each other. The second cell unit group 20 is arranged so as to be adjacent to the first cell unit group 10 in a second direction that is perpendicular to both the first direction and the up-down direction.

[0015] The cell units 101 and 102 have the same structure. For example, a lithium ion battery can be used as each of the cell units 101 and 102. Each of the cell units 101 and 102 may be configured as a so-called all-solid-state battery that includes a solid electrolyte.

[0016] Each of the cell units 101 and 102 has a shape that is longer in the first direction than in the second direction and that is longer in the first direction than in the vertical direction. Each of the cell units 101 and 102 has a shape that is longer in the vertical direction than in the second direction.

[0017] Each of the cell units 101 and 102 has an electrode assembly 110 , a positive electrode current collector terminal 141 , a negative electrode current collector terminal 142 , and a laminate exterior body 160 .

[0018] The electrode assembly 110 is formed as a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, the electrode assembly 110 may also be formed as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The electrode assembly 110 is formed in a shape that is elongated in an orthogonal direction that is orthogonal to both the stacking direction and the up-down direction. The stacking direction corresponds to the second direction, and the orthogonal direction corresponds to the first direction.

[0019] The positive electrode current collector terminal 141 is connected to the electrode body 110. The positive electrode current collector terminal 141 is made of, for example, aluminum. The positive electrode current collector terminal 141 protrudes in the first direction from a portion of the electrode body 110 on one side in the first direction and on one side in the up-down direction.

[0020] The negative electrode current collector terminal 142 is connected to the electrode body 110. The negative electrode current collector terminal 142 is made of, for example, copper. The negative electrode current collector terminal 142 protrudes in the first direction from a portion of the electrode body 110 on the other side in the first direction and on the other side in the up-down direction.

[0021] The laminated exterior body 160 houses the electrode assembly 110 and a portion of each of the current collecting terminals 141, 142. The laminated exterior body 160 is made of a laminated film. As shown in FIGS. 2 to 4, the laminated exterior body 160 has an edge portion 162. The edge portion 162 is formed by connecting (welding) pieces of the laminated film together.

[0022] Each of the current collector terminals 141, 142 protrudes from an edge 162 of the laminated exterior body 160. The positive current collector terminal 141 protrudes from a portion of the laminated exterior body 160 on one side in the first direction and on one side in the up-down direction. The negative current collector terminal 142 protrudes from a portion of the laminated exterior body 160 on the other side in the first direction and on the other side in the up-down direction.

[0023] As shown in Figure 2, the positive electrode collector terminal 141 of the first cell unit 101 located at the end in the first direction is connected to the negative electrode collector terminal 142 of the second cell unit adjacent to the first cell unit 101 in the second direction by a bus bar 170.

[0024] As shown in Fig. 4, a pair of first cell units 101 adjacent to each other in the first direction have a first connection portion 143a that connects the positive electrode current collector terminal 141 of one first cell unit 101 to the negative electrode current collector terminal 142 of the other first cell unit 101. As shown in Fig. 2, in the first cell unit group 10, the first connection portions 143a are arranged alternately up and down along the first direction.

[0025] As shown in Fig. 4, a pair of second cell units 102 adjacent to each other in the first direction have second connection parts 143b that connect the positive electrode current collector terminal 141 of one second cell unit 102 to the negative electrode current collector terminal 142 of the other second cell unit 102. As shown in Fig. 2, in the second cell unit group 20, the second connection parts 143b are arranged alternately up and down along the first direction and do not overlap with the first connection parts 143a in the second direction.

[0026] The cover sheet 200 (see FIG. 4) covers the first cell unit group 10 and the second cell unit group 20 so as to collectively surround these cell unit groups 10, 20. The cover sheet 200 is made of an insulating material (synthetic resin, etc.).

[0027] The cell case 300 houses the cell unit groups 10, 20 and the covering sheet 200. The cell case 300 is made of, for example, aluminum. The cell case 300 is formed in a rectangular parallelepiped shape that is elongated in a first direction. As shown in FIG. 1 , the cell case 300 has a case body 310 and a lid 320.

[0028] The case body 310 is formed in a rectangular tubular shape that is long in the first direction. The case body 310 surrounds the cell unit groups 10 and 20 and the cover sheet 200.

[0029] The lid 320 is connected to the case body 310 by welding or the like so as to close the opening of the case body 310 .

[0030] The external terminal 400 is provided on the lid 320. The external terminal 400 is connected to the current collecting terminals of the cell units 101, 102 of the first cell unit group 10 and the second cell unit group 20 that are arranged closest to the lid 320.

[0031] The connecting member 500 connects a pair of first cell units 101 adjacent to each other in a first direction, and also connects a pair of second cell units 102 adjacent to each other in the first direction. Specifically, the connecting member 500 connects the pair of first cell units 101 adjacent to each other in the first direction so as to restrict the pair of first cell units 101 adjacent to each other in the first direction from moving relative to each other in the second direction, and also connects the pair of second cell units 102 adjacent to each other in the first direction so as to restrict the pair of second cell units 102 adjacent to each other in the second direction from moving relative to each other in the second direction. Note that the connecting member 500 is not shown in FIG. 2.

[0032] As shown in Figures 3 and 4, the connection member 500 is provided on the upper part of each cell unit 101, 102. Specifically, the connection member 500 spans the upper parts of a pair of first cell units 101 adjacent to each other in the first direction, and the upper parts of a pair of second cell units 102 adjacent to each other in the first direction. The connection member 500 is formed in the shape of a flattened rectangular tube. As shown in Figure 3, the upper surface of the connection member 500 may be located at the same position as the upper end of each cell unit 101, 102 or slightly below that position. The connection member 500 is made of, for example, synthetic resin.

[0033] The covering member 600 covers each of the first connection portions 143a and each of the second connection portions 143b. The covering member 600 is made of an insulating material. In this embodiment, the covering member 600 is made of an adhesive member having insulating properties. The covering member 600 may be connected to the cell casing 300. For example, as shown in FIG. 3, the covering member 600 may bond the lower portion of each of the cell units 101, 102 to the cell casing 300. Similarly, the covering member 600 may bond the upper portion of each of the cell units 101, 102 to the cell casing 300.

[0034] As described above, in the energy storage cell 1 of this embodiment, the multiple first connection portions 143a and the multiple second connection portions 143b are arranged alternately above and below in the first direction, which prevents one of a pair of adjacent first cell units 101 from rotating relative to the other about the first connection portion 143a, and prevents one of a pair of adjacent second cell units 102 from rotating relative to the other about the second connection portion 143b. This improves the stability of each cell unit 101, 102. Furthermore, because the second connection portions 143b are arranged so as not to overlap with the first connection portions 143a in the second direction, the occurrence of a short circuit due to contact between the first connection portions 143a and the second connection portions 143b is suppressed.

[0035] As shown in FIG. 5, the connection member 500 may include a first member 510 and a second member 520.

[0036] The first member 510 connects a pair of first cell units 101 adjacent to each other in the first direction. The first member 510 straddles the upper portions of the pair of first cell units 101 adjacent to each other in the first direction.

[0037] The second member 520 connects a pair of second cell units 102 adjacent to each other in the first direction. The second member 520 straddles the upper portions of the pair of second cell units 102 adjacent to each other in the first direction.

[0038] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0039] [Aspect 1] a first cell unit group including a plurality of first cell units arranged in a first direction; a second cell unit group including a plurality of second cell units aligned in the first direction and arranged adjacent to the first cell unit group in a second direction perpendicular to both the first direction and the up-down direction, Each of the plurality of first cell units and the plurality of second cell units comprises: An electrode body; a laminate exterior body that houses the electrode body; a positive electrode current collector terminal protruding from a portion of the laminate exterior body on one side in the first direction and on one side in the up-down direction; a negative electrode current collecting terminal protruding from a portion of the laminate exterior body on the other side in the first direction and on the other side in the up-down direction, a pair of the first cell units adjacent to each other in the first direction have a first connection portion in which the positive electrode current collector terminal of one of the pair of first cell units is connected to the negative electrode current collector terminal of the other of the pair of first cell units, a pair of second cell units adjacent to each other in the first direction have a second connection portion in which the positive electrode current collector terminal of one of the second cell units in the pair is connected to the negative electrode current collector terminal of the other second cell unit, In the first cell unit group, the first connection portions are arranged alternately up and down along the first direction, In the second cell unit group, the second connection portions are arranged alternately up and down along the first direction and do not overlap with the first connection portions in the second direction.

[0040] In this energy storage cell, the multiple first connection portions and multiple second connection portions are arranged alternately above and below along the first direction, preventing one of a pair of adjacent first cell units from rotating relative to the other around the first connection portion, and preventing one of a pair of adjacent second cell units from rotating relative to the other around the second connection portion. This increases the stability of each cell unit. Furthermore, because the second connection portions are arranged so as not to overlap with the first connection portions in the second direction, the occurrence of short circuits due to contact between the first connection portions and the second connection portions is suppressed.

[0041] [Aspect 2] The storage cell of aspect 1 further includes a connecting member that connects a pair of first cell units adjacent to each other in the first direction so as to restrict relative displacement of the pair of first cell units in the second direction, and that connects a pair of second cell units adjacent to each other in the first direction so as to restrict relative displacement of the pair of second cell units in the second direction.

[0042] In this embodiment, relative displacement in the second direction between a pair of adjacent first cell units and relative displacement in the second direction between a pair of adjacent second cell units are suppressed, thereby suppressing peeling of the first connecting portion and the second connecting portion.

[0043] [Aspect 3] The energy storage cell according to aspect 1 or 2, further comprising a covering member made of an insulating material that covers each of the first connection portions and each of the second connection portions.

[0044] In this embodiment, the occurrence of a short circuit due to the first connecting portion coming into contact with the second connecting portion is suppressed.

[0045] [Aspect 4] a cell case that houses the first cell unit group and the second cell unit group; 4. The energy storage cell according to claim 3, wherein the covering member is made of an insulating adhesive member and is connected to the cell casing.

[0046] In this embodiment, relative displacement of each cell unit group with respect to the cell case is suppressed, thereby reducing stresses occurring at the connections between the first cell units and the connections between the second cell units.

[0047] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0048] 1 storage cell, 10 first cell unit group, 20 second cell unit group, 101 first cell unit, 102 second cell unit, 110 electrode body, 141 positive electrode current collecting terminal, 142 negative electrode current collecting terminal, 160 laminated outer casing, 162 edge portion, 200 covering sheet, 300 cell case, 310 case body, 320 lid, 400 external terminal, 500 connecting member, 510 first member, 520 second member, 600 covering member.

Claims

1. a first cell unit group including a plurality of first cell units arranged in a first direction; a second cell unit group including a plurality of second cell units aligned in the first direction and arranged adjacent to the first cell unit group in a second direction perpendicular to both the first direction and the up-down direction, Each of the plurality of first cell units and the plurality of second cell units comprises: An electrode body; a laminate exterior body that houses the electrode body; a positive electrode current collector terminal protruding from a portion of the laminate exterior body on one side in the first direction and on one side in the up-down direction; a negative electrode current collector terminal protruding from a portion of the laminate exterior body on the other side in the first direction and on the other side in the up-down direction, a pair of the first cell units adjacent to each other in the first direction have a first connection portion at which the positive electrode current collector terminal of one of the pair of first cell units is connected to the negative electrode current collector terminal of the other of the pair of first cell units, a pair of the second cell units adjacent to each other in the first direction have a second connection portion at which the positive electrode current collector terminal of one of the second cell units in the pair is connected to the negative electrode current collector terminal of the other of the second cell units, In the first cell unit group, the first connection portions are arranged alternately up and down along the first direction, In the second cell unit group, the second connection portions are arranged alternately up and down along the first direction and do not overlap with the first connection portions in the second direction.

2. 2. The storage cell of claim 1, further comprising a connecting member that connects a pair of first cell units adjacent to each other in the first direction so as to restrict relative displacement of the pair of first cell units in the second direction, and that connects a pair of second cell units adjacent to each other in the first direction so as to restrict relative displacement of the pair of second cell units in the second direction.

3. The energy storage cell according to claim 2 , further comprising a covering member made of an insulating material that covers each of the first connection portions and each of the second connection portions.

4. a cell case that houses the first cell unit group and the second cell unit group; The energy storage cell according to claim 3 , wherein the covering member is made of an adhesive member having insulating properties and is connected to the cell casing.

Images