Storage battery

Abstract

The invention provides a storage battery. The storage battery includes: a first battery cell group including a plurality of first battery cells; and a second battery cell group including a plurality of second battery cells. Each battery cell includes an electrode body, a laminated outer body, a positive current collector terminal, and a negative current collector terminal. The pair of first battery cells has a first connection portion, and the pair of second battery cells has a second connection portion. In the first battery cell group, the first connection portions are arranged in the first direction so as to be alternately positioned up and down. In the second battery cell group, the second connection portions are arranged to be alternately positioned up and down along the first direction, and do not respectively overlap with the first connection portions in the second direction.

Description

Technical Field

[0001] The present disclosure relates to an electric storage battery. Background Art

[0002] For example, Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2023-509216 (JP 2023-509216 A) discloses a battery including: a first electrode body group including a plurality of electrode bodies connected in series with one another along a first direction; and a second electrode body group including a plurality of electrode bodies connected in series with one another along the first direction. The second electrode body group is adjacent to the first electrode body group in a second direction orthogonal to both the first direction and the up-down direction.

[0003] In the first electrode body group, 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 group, 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 group, each first connecting member is provided on the lower portion of each electrode body, and in the second electrode body group, each first connecting member is provided on the upper portion of each electrode body. Summary of the Invention

[0004] In the battery described in JP 2023-509216 A, the stability of each electrode body group is low. For example, for each electrode body in the first electrode body group, the upper portion of the electrode body may rotate relative to the lower portion of the electrode body about a rotation axis connecting a plurality of first connecting members arranged side by side in a first direction.

[0005] An object of the present disclosure is to provide a storage battery capable of improving the stability of each battery cell.

[0006] 18. The battery according to claim 17, wherein the plurality of first and second battery cells are aligned side by side in a first direction and are arranged adjacent to the first battery cell group in a second direction perpendicular to both the first and upper directions. on the other side of the battery pack and on the other side of the laminated external body in the up-down direction, and wherein a pair of first battery cells adjacent to each other in the first direction have a first connection portion, in which the positive collector terminal of one of the first battery cells in the pair of first battery cells is connected to the negative collector terminal of the other first battery cell in the pair of first battery cells, and a pair of second battery cells adjacent to each other in the first direction have a second connection portion, in which the positive collector terminal of one of the second battery cells in the pair of second battery cells is connected to the negative collector terminal of the other second battery cell in the pair of second battery cells; in the first battery cell group, the first connection portion is arranged to be alternately positioned up and down along the first direction; and in the second battery cell group, the second connection portion is arranged to be alternately positioned up and down along the first direction and does not overlap with the first connection portion in the second direction.

[0007] According to the present disclosure, it is possible to provide a storage battery capable of improving the stability of each battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like symbols represent like elements, and wherein:

[0009] Figure 1 is a perspective view schematically showing a storage battery according to an embodiment of the present disclosure;

[0010] Figure 2 is a perspective view of a first battery cell group and a second battery cell group;

[0011] Figure 3 is a front view schematically showing a portion of a storage battery;

[0012] Figure 4 It is along Figure 3 A cross-sectional view taken along line IV-IV in FIG.

[0013] Figure 5 is a diagram schematically showing a modification of the connecting member. DETAILED DESCRIPTION

[0014] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings to be referred to below, the same or corresponding parts are represented by the same reference numerals.

[0015] Figure 1 is a perspective view schematically showing a storage battery according to an embodiment of the present disclosure. Figure 2 yes Figure 1 A perspective view of a first battery cell group and a second battery cell group is shown. Figure 3 It is a front view schematically showing a part of the storage battery. Figure 4 It is along Figure 3 This storage battery 1 is mounted on the bottom of a vehicle, for example.

[0016] like Figures 1 to 4 As shown, the battery 1 includes a first battery cell group 10, a second battery cell group 20, and a coating sheet 200 (see Figure 4 and Figure 5 ), battery case 300, external terminal 400, connecting member 500 and coating member 600. Note that Figure 2 The coating sheet 200 is omitted in the illustration.

[0017] The first battery cell group 10 includes a plurality of first battery cells 101. In this embodiment, the first battery cell group 10 includes four first battery cells 101. However, the number of first battery cells 101 is not limited to four. The first battery cells 101 are arranged side by side along a first direction. A pair of first battery cells 101 adjacent to each other in the first direction are connected to each other.

[0018] The second battery cell group 20 includes a plurality of second battery cells 102. In this embodiment, the second battery cell group 20 includes four second battery cells 102. However, the number of second battery cells 102 is not limited to four. The second battery cells 102 are arranged side by side along a first direction. A pair of second battery cells 102 adjacent to each other in the first direction are connected to each other. The second battery cell group 20 is arranged adjacent to the first battery cell group 10 in a second direction that is orthogonal to both the first direction and the up-down direction.

[0019] The battery cells 101 and 102 have the same structure. An example of each of the battery cells 101 and 102 includes a lithium-ion battery. Each of the battery cells 101 and 102 may be formed of a so-called all-solid-state battery including a solid electrolyte.

[0020] Each battery cell 101, 102 has a shape extending longer in the first direction than in the second direction and extending longer in the first direction than in the up-down direction. Each battery cell 101, 102 has a shape extending longer in the up-down direction than in the second direction.

[0021] Each of the battery cells 101 , 102 includes an electrode body 110 , a positive electrode current collecting terminal 141 , a negative electrode current collecting terminal 142 , and a laminated exterior body 160 .

[0022] The electrode body 110 is composed of a wound body in which the positive electrode sheet and the negative electrode sheet are wound with a separator interposed therebetween. However, the electrode body 110 may be composed of a laminated body in which the positive electrode sheet and the negative electrode sheet are laminated with a separator interposed therebetween. The electrode body 110 is formed into a shape that is longer in a direction perpendicular to both the lamination direction and the vertical direction. The lamination direction corresponds to the second direction, and the orthogonal direction corresponds to the first direction.

[0023] Positive electrode collector terminal 141 is connected to electrode body 110. Positive electrode collector terminal 141 is made of, for example, aluminum. Positive electrode collector terminal 141 protrudes in the first direction from a portion of electrode body 110 located on one side of electrode body 110 in the first direction and on one side of electrode body 110 in the vertical direction.

[0024] A 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 located on the other side of the electrode body 110 in the first direction and on the other side of the electrode body 110 in the vertical direction.

[0025] The laminated outer body 160 accommodates a portion of the electrode body 110 and each of the current collecting terminals 141, 142. The laminated outer body 160 is made of a laminate film. Figures 2 to 4 As shown, the laminated outer body 160 has an edge portion 162. The edge portion 162 is formed by connecting (welding) laminated films to each other.

[0026] Each current collector terminal 141, 142 protrudes from an edge portion 162 of the laminated external body 160. The positive current collector terminal 141 protrudes from a portion of the laminated external body 160 that is located on one side of the laminated external body 160 in the first direction and on one side of the laminated external body 160 in the up-down direction. The negative current collector terminal 142 protrudes from a portion of the laminated external body 160 that is located on the other side of the laminated external body 160 in the first direction and on the other side of the laminated external body 160 in the up-down direction.

[0027] like Figure 2 As shown, the positive collector terminal 141 of the first battery cell 101 arranged at the end in the first direction is connected to the negative collector terminal 142 of the second battery cell adjacent to the first battery cell 101 in the second direction via the bus bar 170 .

[0028] like Figure 4 As shown, a pair of first battery cells 101 adjacent to each other in the first direction have a first connection portion 143a in which the positive collector terminal 141 of one first battery cell 101 is connected to the negative collector terminal 142 of the other first battery cell 101. Figure 2 As shown, in the first battery cell group 10 , the first connection portions 143 a are arranged side by side along the first direction so as to be alternately positioned up and down.

[0029] like Figure 4 As shown, a pair of second battery cells 102 adjacent to each other in the first direction have a second connection portion 143b in which the positive collector terminal 141 of one second battery cell 102 is connected to the negative collector terminal 142 of the other second battery cell 102. Figure 2 As shown, in the second battery cell group 20 , the second connection portions 143 b are arranged side by side in the first direction so as to be alternately positioned up and down and do not overlap with the first connection portions 143 a in the second direction.

[0030] Coated sheet 200 (see Figure 4 ) covers the first battery cell group 10 and the second battery cell group 20 so as to collectively surround these battery cell groups 10, 20. The coating sheet 200 is made of an insulating material (synthetic resin, etc.).

[0031] The battery case 300 accommodates each of the battery cell groups 10 and 20 and the coating sheet 200. The battery case 300 is made of, for example, aluminum. The battery case 300 is formed in a rectangular parallelepiped shape elongated in the first direction. Figure 1 As shown, the battery housing 300 includes a housing body 310 and a cover 320 .

[0032] The case body 310 is formed in a rectangular tubular shape elongated in a first direction and surrounds each of the battery cell groups 10 and 20 and the coating sheet 200 .

[0033] The cover 320 is connected to the case body 310 by welding or the like so as to block the opening of the case body 310 .

[0034] The external terminal 400 is provided on the cover 320. The external terminal 400 is connected to the collector terminals of the battery cells 101 and 102 located at positions closest to the cover 320 in the first and second battery cell groups 10 and 20.

[0035] The connecting member 500 connects a pair of first battery cells 101 adjacent to each other in the first direction, and also connects a pair of second battery cells 102 adjacent to each other in the first direction. Specifically, the connecting member 500 connects a pair of first battery cells 101 adjacent to each other in the first direction so as to restrict the displacement of the pair of first battery cells 101 relative to each other in the second direction, and connects a pair of second battery cells 102 adjacent to each other in the first direction so as to restrict the displacement of the pair of second battery cells 102 relative to each other in the second direction. Note that Figure 2 The connecting member 500 is omitted in the illustration.

[0036] like Figure 3 and Figure 4 As shown, the connecting member 500 is provided on the upper portion of each battery cell 101, 102. Specifically, the connecting member 500 spans the upper portions of a pair of first battery cells 101 adjacent to each other in the first direction, and spans the upper portions of a pair of second battery cells 102 adjacent to each other in the first direction. The connecting member 500 is formed in a flat rectangular tube shape. Figure 3 As shown, the upper surface of the connection member 500 may be located at the same position as or slightly lower than the upper end portion of each of the battery cells 101, 102. The connection member 500 is made of, for example, a synthetic resin.

[0037] The coating member 600 covers each first connection portion 143a and each second connection portion 143b. The coating member 600 is made of an insulating material. In this embodiment, the coating member 600 is made of an adhesive member having insulating properties. The coating member 600 can be connected to the battery case 300. For example, Figure 3 As shown, the coating member 600 may couple the lower portion of each battery cell 101 , 102 to the battery case 300 . Similarly, the coating member 600 may couple the upper portion of each battery cell 101 , 102 to the battery case 300 .

[0038] As described above, in the storage battery 1 of this embodiment, the plurality of first connecting portions 143a and the plurality of second connecting portions 143b are arranged in the first direction so as to be alternately positioned up and down. This prevents one of a pair of adjacent first battery cells 101 from rotating relative to the other first battery cell 101 about the first connecting portion 143a, and prevents one of a pair of adjacent second battery cells 102 from rotating relative to the other second battery cell 102 about the second connecting portion 143b. As a result, the stability of each battery cell 101, 102 is enhanced. Furthermore, since the second connecting portions 143b are arranged side by side so as not to overlap with the first connecting portion 143a in the second direction, the occurrence of a short circuit caused by contact between the first connecting portion 143a and the second connecting portion 143b is suppressed.

[0039] like Figure 5 As shown, the connection member 500 may have a first member 510 and a second member 520 .

[0040] The first member 510 connects a pair of first battery cells 101 adjacent to each other in the first direction. The first member 510 spans over upper portions of the pair of first battery cells 101 adjacent to each other in the first direction.

[0041] The second member 520 connects a pair of second battery cells 102 adjacent to each other in the first direction. The second member 520 spans over upper portions of the pair of second battery cells 102 adjacent to each other in the first direction.

[0042] Those skilled in the art will appreciate that the above-described exemplary embodiments are specific examples in the following aspects.

[0043] Aspect 1

[0044] A storage battery, comprising:

[0045] a first battery cell group including a plurality of first battery cells arranged side by side along a first direction; and

[0046] a second battery cell group, the second battery cell group including a plurality of second battery cells arranged side by side in the first direction and arranged adjacent to the first battery cell group in a second direction orthogonal to both the first direction and the up-down direction, wherein each of the first battery cell and the second battery cell includes:

[0047] Electrode body;

[0048] a laminated outer body housing the electrode body;

[0049] a positive electrode current collector terminal protruding from a portion of the laminated external body, the portion being located on one side of the laminated external body in the first direction and on one side of the laminated external body in the up-down direction; and

[0050] a negative electrode current collecting terminal protruding from a portion of the laminated external body, the portion being located on the other side of the laminated external body in the first direction and on the other side of the laminated external body in the up-down direction, and

[0051] in:

[0052] A pair of first battery cells adjacent to each other in the first direction have a first connection portion in which a positive collector terminal of one first battery cell of the pair of first battery cells is connected to a negative collector terminal of the other first battery cell of the pair of first battery cells;

[0053] A pair of second battery cells adjacent to each other in the first direction have a second connection portion in which the positive collector terminal of one of the pair of second battery cells is connected to the negative collector terminal of the other of the pair of second battery cells;

[0054] In the first battery cell group, the first connection portions are arranged along the first direction to be alternately positioned up and down; and

[0055] In the second battery cell group, the second connection portions are arranged along the first direction to be alternately positioned up and down and respectively not overlap with the first connection portions in the second direction.

[0056] In this storage battery, the first and second connecting portions are arranged along a first direction so as to be alternately positioned up and down. This prevents one of a pair of adjacent first battery cells from rotating about the first connecting portion relative to the other first battery cell, and also prevents one of a pair of adjacent second battery cells from rotating about the second connecting portion relative to the other second battery cell. This enhances the stability of each battery cell. Furthermore, since the second connecting portions are arranged side by side so as not to overlap with the first connecting portions in the second direction, short circuits caused by contact between the first and second connecting portions are prevented.

[0057] Aspect 2

[0058] The storage battery according to aspect 1 also includes a connecting member, which connects a pair of first battery cells adjacent to each other in the first direction to each other so as to limit the displacement of the pair of first battery cells relative to each other in the second direction, and connects a pair of second battery cells adjacent to each other in the first direction to each other so as to limit the displacement of the pair of second battery cells relative to each other in the second direction.

[0059] In this aspect, relative displacement between a pair of adjacent first battery cells and a pair of adjacent second battery cells in the second direction is restricted, thereby suppressing peeling of the first connecting portion and the second connecting portion.

[0060] Aspect 3

[0061] The storage battery according to aspect 1 or 2 further includes a coating member made of an insulating material and coating each of the first connecting portions and each of the second connecting portions.

[0062] In this aspect, the occurrence of a short circuit caused by the first connection portion contacting the second connection portion is suppressed.

[0063] Aspect 4

[0064] The storage battery according to aspect 3 further includes a battery case accommodating the first battery cell group and the second battery cell group, wherein the coating member is made of an insulating adhesive member and is connected to the battery case.

[0065] In this regard, relative displacement of each battery cell group with respect to the battery case is suppressed, thereby reducing stress occurring at the connection portion between the first battery cells and the connection portion between the second battery cells.

[0066] Note that the embodiments disclosed herein are illustrative in all aspects and should not be considered as restrictive. The scope of the present disclosure is indicated by the claims, rather than by the description of the embodiments, and also includes all modifications within the scope of the claims and meanings equivalent to the scope of the claims.

Claims

1. A storage battery comprising: a first battery cell group including a plurality of first battery cells arranged side by side in a first direction; as well as a second battery cell group, the second battery cell group including a plurality of second battery cells arranged side by side in the first direction and arranged adjacent to the first battery cell group in a second direction orthogonal to both the first direction and the up-down direction, wherein each of the first battery cell and the second battery cell includes: Electrode body; a laminated outer body housing the electrode body; a positive electrode current collector terminal protruding from a portion of the laminated external body located on one side of the laminated external body in the first direction and on one side of the laminated external body in the up-down direction; and a negative electrode current collector terminal protruding from a portion of the laminated external body located on the other side of the laminated external body in the first direction and on the other side of the laminated external body in the up-down direction, and wherein: A pair of first battery cells adjacent to each other in the first direction have a first connection portion in which a positive collector terminal of one first battery cell of the pair of first battery cells is connected to a negative collector terminal of the other first battery cell of the pair of first battery cells; A pair of second battery cells adjacent to each other in the first direction have a second connection portion in which the positive collector terminal of one second battery cell of the pair of second battery cells is connected to the negative collector terminal of the other second battery cell of the pair of second battery cells; In the first battery cell group, the first connection portions are arranged along the first direction to be alternately positioned up and down; and In the second battery cell group, the second connection portions are arranged along the first direction to be alternately positioned up and down and respectively do not overlap with the first connection portions in the second direction.

2. The storage battery according to claim 1 further includes a connecting member, which connects the pair of first battery cells adjacent to each other in the first direction to each other so as to limit the displacement of the pair of first battery cells relative to each other in the second direction, and connects the pair of second battery cells adjacent to each other in the first direction to each other so as to limit the displacement of the pair of second battery cells relative to each other in the second direction. 3 . The storage battery according to claim 2 , further comprising a coating member made of an insulating material and coating each of the first connecting portions and each of the second connecting portions.

4. The storage battery according to claim 3, further comprising a battery case that houses the first battery cell group and the second battery cell group, wherein The coating member is made of an insulating adhesive member and is connected to the battery case.

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