Power storage cell

Abstract

To provide a power storage cell capable of suppressing relative displacement of a cell unit with respect to a cell case.SOLUTION: A power storage cell 1 includes at least one cell unit 101, 102 and a cell case 300 that houses the at least one cell unit. The cell case has a case body 310 that opens upward and a lid 320 that is connected to the case body so as to close the opening of the case body. The case body 310 includes a bottom wall 312 that is located below the at least one cell unit. The lid 320 includes a pressing portion 324 that presses the at least one cell unit against the bottom wall.SELECTED DRAWING: Figure 3

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 plurality of electrode body sets and a case for housing the plurality of electrode body sets. The plurality of electrode body sets are connected in series to each other by a first connecting member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-509216 Summary of the Invention [Problem to be solved by the invention]

[0004] In the battery described in JP-A-2023-509216, the electrode body set may be displaced relative to the case due to vibration or the like.

[0005] An object of the present disclosure is to provide an energy storage cell that can suppress relative displacement of a cell unit with respect to a cell casing. [Means for solving the problem]

[0006] A storage cell according to one aspect of the present disclosure comprises at least one cell unit and a cell case that houses the at least one cell unit, wherein the cell case has a case body that opens upward and a lid connected to the case body so as to close the opening of the case body, the case body having a bottom wall located below the at least one cell unit, and the lid including a pressing portion that presses the at least one cell unit toward the bottom wall, the pressing portion having a shape that is recessed toward the at least one cell unit. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an energy storage cell that is capable of suppressing relative displacement of the cell unit with respect to the cell casing. [Brief explanation of the drawings]

[0008] [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 front view of the storage cell. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a cross-sectional view schematically showing an electrode body. [Figure 5] FIG. 10 is a cross-sectional view schematically showing a modified example of the lid. [Figure 6] FIG. 10 is a cross-sectional view schematically showing a modified example of the lid. DETAILED DESCRIPTION OF THE INVENTION

[0009] 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.

[0010] Fig. 1 is a perspective view schematically showing a storage cell according to an embodiment of the present disclosure. Fig. 2 is a front view of the storage cell. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Fig. 4 is a cross-sectional view schematically showing an electrode assembly. This storage cell 1 is mounted, for example, on the bottom of a vehicle.

[0011] As shown in FIGS. 1 to 4, the energy storage cell 1 includes a plurality of cell units 100, a covering sheet 200, a cell case 300, an external terminal 400, and an adhesive member 500.

[0012] As shown in FIG. 2 , the plurality of cell units 100 includes a first cell unit 101, a second cell unit 102, a third cell unit 103, and a fourth cell unit 104. In this embodiment, the plurality of cell units 100 includes eight cell units 100. However, the number of cell units 100 is not limited to eight. Each cell unit 100 may be, for example, a lithium-ion battery. Each cell unit 100 may be configured as a so-called all-solid-state battery including a solid electrolyte.

[0013] The first cell unit 101 is connected to the third cell unit 103. The second cell unit 102 is connected to the fourth cell unit 104. The first cell unit 101 and the second cell unit 102 are adjacent to each other in a second direction (a direction perpendicular to the paper surface in FIG. 2) that is perpendicular to both the first direction in which the first cell unit 101 and the third cell unit 103 are aligned and the vertical direction. The third cell unit 103 and the fourth cell unit 104 are adjacent to each other in the second direction. Each cell unit 100 has a shape that is longer in the first direction than in the second direction and that extends longer in the first direction than in the vertical direction. Each cell unit 100 has a shape that extends longer in the vertical direction than in the second direction.

[0014] As shown in FIGS. 2 to 4, each cell unit 100 has at least one electrode assembly 110, a current collecting terminal 140, and a laminate exterior body 160.

[0015] As shown in FIG. 3, at least one electrode assembly 110 includes two electrode assemblies 110. However, the number of electrode assemblies 110 is not limited to two. As shown in FIG. 4, each electrode assembly 110 is configured as a wound assembly in which a positive electrode sheet 112 and a negative electrode sheet 114 are wound with a separator 116 interposed therebetween. However, each electrode assembly 110 may be configured as a laminate in which the positive electrode sheet 112 and the negative electrode sheet 114 are stacked with the separator 116 interposed therebetween. The two electrode assemblies 110 are adjacent to each other in the stacking direction in which the positive electrode sheet 112 and the negative electrode sheet 114 are stacked on top of each other. Each electrode assembly 110 is formed in an elongated shape in an orthogonal direction (axial direction of the wound assembly) that is orthogonal to both the stacking direction and the up-down direction. The stacking direction (thickness direction) corresponds to the second direction, and the orthogonal direction (axial direction of the wound assembly) corresponds to the first direction.

[0016] The current collecting terminal 140 is connected to the electrode body 110. The current collecting terminal 140 protrudes from the electrode body 110 in a first direction. The current collecting terminal 140 electrically connected to the positive electrode sheet 112 of the electrode body 110 is made of, for example, aluminum. The current collecting terminal 140 electrically connected to the negative electrode sheet 114 of the electrode body 110 is made of, for example, copper. The current collecting terminal 140 is formed in a flat plate shape.

[0017] The laminated exterior body 160 houses the electrode assembly 110. The laminated exterior body 160 is made of a laminated film. The current collecting terminal 140 protrudes from the edge of the laminated exterior body 160 in a first direction.

[0018] The covering sheet 200 covers the multiple cell units 100. More specifically, the covering sheet 200 covers the multiple cell units 100 so as to surround the multiple cell units 100 collectively. The covering sheet 200 is made of an insulating material (synthetic resin, etc.). Note that the covering sheet 200 may be omitted.

[0019] The cell case 300 houses a plurality of cell units 100. The cell case 300 is made of, for example, aluminum. The cell case 300 is formed in a rectangular parallelepiped shape. Each cell unit 100 is housed in the cell case 300 with the central axis of the electrode assembly 110 parallel to the first direction. As shown in FIGS. 1 to 3, the cell case 300 has a case body 310 and a lid 320.

[0020] The case body 310 has a shape that opens upward and includes a bottom wall 312 and a peripheral wall 314.

[0021] The bottom wall 312 is located below the plurality of cell units 100. The bottom wall 312 supports the plurality of cell units 100. The bottom wall 312 may be formed in a flat plate shape.

[0022] The peripheral wall 314 stands upright from the outer edge of the bottom wall 312. The peripheral wall 314 surrounds the periphery of the multiple cell units 100. The peripheral wall 314 is formed in a rectangular cylindrical shape. A pair of external terminals 400 are provided on the sides of the peripheral wall 314 in the first direction.

[0023] 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. The lid 320 has a pair of base portions 322 and a pressing portion 324.

[0024] The pair of base portions 322 are spaced apart from each other in the second direction. Each base portion 322 is connected to the upper end portion of the peripheral wall 314. Each base portion 322 is formed flat. Each base portion 322 extends along the first direction.

[0025] The pressing portion 324 is provided between the pair of base portions 322. The pressing portion 324 connects the pair of base portions 322 together. The pressing portion 324 presses the cell unit 100 toward the bottom wall 312. The pressing portion 324 presses both of a pair of cell units adjacent in the second direction (e.g., the first cell unit 101 and the second cell unit 102) toward the bottom wall 312. The pressing portion 324 has a shape that is recessed from the pair of base portions 322 toward the cell unit 100. The pressing portion 324 extends along the first direction. As shown in Figures 1 and 3, the pressing portion 324 has a pair of inclined portions 324a and a pressing portion 324b.

[0026] Each inclined portion 324a is connected to an inner end portion in the second direction of the base portion 322. Each inclined portion 324a is gradually inclined toward the cell unit 100 as it moves from the inner end portion in the second direction of the base portion 322 toward the inside in the second direction.

[0027] The pressing portion 324b connects the pair of inclined portions 324a together. The pressing portion 324b straddles a pair of cell units 100 adjacent in the second direction. The pressing portion 324b presses both of the pair of cell units 100 adjacent in the second direction downward. The pressing portion 324b is formed in a flat plate shape.

[0028] The pressing portion 324 may be formed on the lid 320 by pressing or the like before the lid 320 is connected to the case body 310, or may be formed on the lid 320 after the lid 320 is connected to the case body 310.

[0029] The bottom wall 312 of the case body 310 may also be formed to have the same structure as the lid 320 .

[0030] The adhesive member 500 secures each cell unit 100 to the cell casing 300. In this embodiment, the adhesive member 500 secures each cell unit 100 to the cell casing 300 via the cover sheet 200. The adhesive member 500 may be made of a thermally conductive adhesive. As shown in FIG. 3 , the adhesive member 500 is provided between each of a pair of cell units 100 adjacent in the second direction and the pressing portion 324b. The adhesive member 500 has a central adhesive portion 510 that fits between the pair of cell units 100 adjacent in the second direction. Note that the adhesive member 500 may also be provided between each of a pair of cell units 100 adjacent in the second direction and the bottom wall 312.

[0031] As described above, in the energy storage cell 1 of this embodiment, the cell unit 100 is pressed against the bottom wall 312 by the pressing portion 324, so that relative displacement of the cell unit 100 with respect to the cell case 300 is suppressed.

[0032] 5, the lid 320 may have an intermediate portion 326 formed between the base portion 322 and the pressing portion 324. The intermediate portion 326 protrudes upward from the base portion 322 and the pressing portion 324b. In other words, the intermediate portion 326 protrudes in a direction away from the cell unit 100.

[0033] 6, the base 322 may be formed in a flat plate shape that closes the opening of the case body 310, and the pressing portion 324 may have a plurality of protrusions 324c provided at positions spaced apart from one another in the perpendicular direction. The plurality of protrusions 324c are aligned in the perpendicular direction above each electrode body 110. Each protrusion 324c has a shape that protrudes from the base 322 toward the electrode body 110. Each protrusion 324c may be formed by pressing the base 322.

[0034] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0035] [Aspect 1] at least one cell unit; a cell case that houses the at least one cell unit; The cell casing is A case body that opens upward; a lid connected to the case body so as to close the opening of the case body, the case body has a bottom wall located below the at least one cell unit, the lid includes a pressing portion that presses the at least one cell unit toward the bottom wall, The pressing portion has a shape that is recessed toward the at least one cell unit.

[0036] In this energy storage cell, the cell unit is pressed against the bottom wall by the pressing portion, so that relative displacement of the cell unit with respect to the cell case is suppressed.

[0037] [Aspect 2] The at least one cell unit comprises: a first cell unit; a second cell unit disposed adjacent to the first cell unit, Each of the first cell unit and the second cell unit comprises: At least one electrode body; a laminate exterior body covering the at least one electrode body, the first cell unit and the second cell unit are adjacent to each other in the stacking direction of the electrode body, 2. The energy storage cell according to aspect 1, wherein the pressing portion presses both the first cell unit and the second cell unit against the bottom wall.

[0038] In this embodiment, both the first cell unit and the second cell unit are prevented from being displaced relative to the cell casing.

[0039] [Aspect 3] further comprising an adhesive member that fixes the first cell unit and the second cell unit to the cell case; The electrode body is formed of a wound body, the first cell unit and the second cell unit are housed in the cell case in such a manner that the central axis of the electrode body is perpendicular to a direction connecting the bottom wall and the lid, 3. The energy storage cell according to aspect 2, wherein the adhesive member is provided between the pressing portion and both the first cell unit and the second cell unit.

[0040] In this embodiment, the relative displacement of each cell unit with respect to the cell case is more reliably suppressed.

[0041] [Aspect 4] 4. The energy storage cell according to aspect 3, wherein the adhesive member has an intermediate adhesive portion that is inserted between the first cell unit and the second cell unit.

[0042] In this embodiment, it is possible to suppress relative displacement of each cell unit with respect to the cell case while maintaining the volumetric efficiency of the storage cells.

[0043] 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]

[0044] 1 storage cell, 100 cell unit, 110 electrode body, 112 positive electrode sheet, 114 negative electrode sheet, 116 separator, 160 laminate exterior body, 200 covering sheet, 300 cell case, 310 case body, 320 lid, 322 base, 324 pressing portion, 324a inclined portion, 324b pressing portion, 324c protrusion portion, 326 middle portion, 400 external terminal, 500 adhesive member, 510 central adhesive portion.

Claims

1. at least one cell unit; a cell case that houses the at least one cell unit; The cell casing is A case body that opens upward; a lid connected to the case body so as to close the opening of the case body, the case body has a bottom wall located below the at least one cell unit, the lid includes a pressing portion that presses the at least one cell unit toward the bottom wall, The pressing portion has a shape that is recessed toward the at least one cell unit.

2. The at least one cell unit comprises: a first cell unit; a second cell unit disposed adjacent to the first cell unit, Each of the first cell unit and the second cell unit At least one electrode body; a laminate exterior body covering the at least one electrode body, the first cell unit and the second cell unit are adjacent to each other in the stacking direction of the electrode body, The energy storage cell according to claim 1 , wherein the pressing portion presses both the first cell unit and the second cell unit against the bottom wall.

3. an adhesive member that fixes the first cell unit and the second cell unit to the cell case; The electrode body is formed of a wound body, the first cell unit and the second cell unit are housed in the cell case in such a manner that the central axis of the electrode body is perpendicular to a direction connecting the bottom wall and the lid, The energy storage cell according to claim 2 , wherein the adhesive member is provided between the pressing portion and both the first cell unit and the second cell unit.

4. The energy storage cell according to claim 3 , wherein the adhesive member has an intermediate adhesive portion that is inserted between the first cell unit and the second cell unit.

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