Power storage cell and manufacturing method of the same

Abstract

To provide a power storage cell which can inhibit relative displacement of a cell module relative to a cell case.SOLUTION: A power storage cell includes: a cell module including a plurality of cell units 100; a cell case 300 which houses the cell module; and an adhesive member provided in the cell case. The cell case is formed in a rectangular parallelepiped shape. The cell module has opposing corner parts 12 each opposing a corner part 302 of the cell case. The adhesive member includes corner adhesive parts 510 each of which bonds the corner part 302 of the cell case and the opposing corner part 12 to each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage cell and a method for manufacturing the same. [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 is capable of suppressing relative displacement of a cell module with respect to a cell casing, and a method for manufacturing the same. [Means for solving the problem]

[0006] A storage cell according to one aspect of the present disclosure comprises a cell module including a plurality of cell units, a cell case that houses the cell module, and an adhesive member provided within the cell case, wherein the cell case is formed in a rectangular parallelepiped shape, the cell module has an opposing corner that faces a corner of the cell case, and the adhesive member includes a corner adhesive portion that bonds the corner of the cell case to the opposing corner.

[0007] A method for manufacturing a storage cell according to one aspect of the present disclosure is a method for manufacturing the above-mentioned storage cell, comprising an insertion step of inserting the cell module into the cell case, and a supply step of supplying an adhesive material that forms the adhesive member into the cell case, wherein the supply step uses a supply tool having a storage portion that can store the adhesive material and a discharge portion that is connected to the storage portion and discharges the adhesive material, and the adhesive material is supplied to the corner of the cell case by inserting the discharge portion between the corner of the cell case and the cell module. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide an energy storage cell that is capable of suppressing relative displacement of a cell module with respect to a cell casing, and a method for manufacturing the same. [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 an exploded perspective view of the storage cell shown in FIG. [Figure 3] FIG. 2 is a plan view of the storage cell. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 4 is a cross-sectional view taken along line VV in FIG. [Figure 6] 10A and 10B are cross-sectional views schematically illustrating a step of supplying an adhesive member into a cell case. [Figure 7] 10A and 10B are cross-sectional views schematically illustrating a step of supplying an adhesive member into a cell case. [Figure 8] 10A and 10B are cross-sectional views schematically showing modified examples of corner adhesive portions and intermediate adhesive portions. [Figure 9] 10A and 10B are cross-sectional views schematically showing modified examples of the upper adhesive portion and the lower adhesive portion. 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 an exploded perspective view of the storage cell shown in Fig. 1. Fig. 3 is a plan view of the storage cell. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. Fig. 5 is a cross-sectional view taken along line VV in Fig. 3. This storage cell 1 is mounted, for example, on the bottom of a vehicle.

[0012] 1 to 5, the energy storage cell 1 includes a cell module 10 (see FIG. 2), a cell case 300, an external terminal 400, and an adhesive member 500. Note that the adhesive member 500 is omitted from FIG. 2.

[0013] The cell module 10 includes a plurality of cell units 100. In this embodiment, the cell module 10 has a plurality of cell units 100 and a covering sheet 200. Note that the covering sheet 200 is not shown in Fig. 3 .

[0014] 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.

[0015] The first cell unit 101 is connected to the second cell unit 102. The third cell unit 103 is connected to the fourth cell unit 104. The first cell unit 101 and the third cell unit 103 are adjacent to each other in a second direction that is perpendicular to both the first direction in which the first cell unit 101 and the second cell unit 102 are aligned and the vertical direction. The second cell unit 102 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.

[0016] Each cell unit 100 has at least one electrode assembly 110 (see FIGS. 3 and 5), a current collecting terminal 140, and a laminate exterior body 160.

[0017] At least one electrode body 110 includes two electrode bodies 110. However, the number of electrode bodies 110 is not limited to two. Each electrode body 110 is formed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, each electrode body 110 may be formed of a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The two electrode bodies 110 are adjacent to each other in the stacking direction (the vertical direction in FIG. 3) in which the positive electrode sheet and the negative electrode sheet are stacked on top of each other. Each electrode body 110 is formed in a shape that is elongated in an orthogonal direction that is orthogonal to both the stacking direction and the vertical direction. The stacking direction (thickness direction) corresponds to the second direction, and the orthogonal direction corresponds to the first direction.

[0018] The first cell unit 101 and the third cell unit 103 are adjacent to each other in the stacking direction. That is, the first cell unit 101 and the third cell unit 103 are an example of a "pair of adjacent cell units" in the present disclosure. Similarly, the second cell unit 102 and the fourth cell unit 104 are an example of a "pair of adjacent cell units" in the present disclosure.

[0019] The first cell unit 101 and the third cell unit 103 are arranged at the ends in the orthogonal direction. That is, the first cell unit 101 and the third cell unit 103 are an example of the "endmost cell unit" in this disclosure.

[0020] The current collecting terminal 140 is connected to the electrode body 110. The current collecting terminal 140 protrudes from the electrode body 110 in the perpendicular direction. The current collecting terminal 140 electrically connected to the positive electrode sheet of the electrode body 110 is made of, for example, aluminum. The current collecting terminal 140 electrically connected to the negative electrode sheet of the electrode body 110 is made of, for example, copper. The current collecting terminal 140 is formed in a flat plate shape.

[0021] As shown in Figures 2 to 4, the current collecting terminal 140 of the first cell unit 101 is connected to the current collecting terminal 140 of the second cell unit 102. Similarly, the current collecting terminal 140 of the third cell unit 103 is connected to the current collecting terminal 140 of the fourth cell unit 104. In other words, the first cell unit 101 and the second cell unit 102 are an example of a "pair of connected cell units" in the present disclosure. Similarly, the third cell unit 103 and the fourth cell unit 104 are an example of a "pair of connected cell units" in the present disclosure.

[0022] The laminated exterior body 160 houses each electrode assembly 110 and a part of the current collecting terminal 140. The laminated exterior body 160 is made of a laminated film. The current collecting terminal 140 protrudes outward in the orthogonal direction from the edge of the laminated exterior body 160.

[0023] The cover sheet 200 covers the multiple cell units 100. More specifically, the cover sheet 200 covers the multiple cell units 100 so as to surround the multiple cell units 100 collectively. The cover sheet 200 is made of an insulating material (synthetic resin, etc.). Because each electrode assembly 110 is formed as a wound body, the corners of the cover sheet 200 are curved, as shown in FIG. 5 .

[0024] The covering sheet 200 has an edge portion 202 , an upper covering portion 221 , a lower covering portion 222 , and an enclosing portion 230 .

[0025] The edges 202 are formed at the ends of the covering sheet 200 in the orthogonal direction.

[0026] The upper covering portion 221 covers the upper ends 170 (see FIG. 5) of a pair of adjacent cell units that are adjacent to each other in the stacking direction. For example, the upper covering portion 221 covers the upper ends 170 of the first cell unit 101 and the third cell unit 103. The upper covering portion 221 covers the upper ends 170 of the second cell unit 102 and the fourth cell unit 104.

[0027] The lower covering portion 222 covers the lower ends 180 (see FIG. 5) of a pair of adjacent cell units that are adjacent to each other in the stacking direction. For example, the lower covering portion 222 covers the lower ends 180 of the first cell unit 101 and the third cell unit 103. The lower covering portion 222 covers the lower ends 180 of the second cell unit 102 and the fourth cell unit 104.

[0028] The surrounding portion 230 surrounds each current collecting terminal 140 of the pair of connected cell units. For example, the surrounding portion 230 surrounds the current collecting terminal 140 of the first cell unit 101 and the current collecting terminal 140 of the second cell unit 102. The surrounding portion 230 surrounds the current collecting terminal 140 of the third cell unit 103 and the current collecting terminal 140 of the fourth cell unit 104.

[0029] The cell case 300 houses the cell module 10. In this embodiment, the cell case 300 houses a plurality of cell units 100 and a 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. The cell case 300 has eight corner portions 302. As shown in FIGS. 1 and 2, the cell case 300 has a case body 310 and a lid 320.

[0030] The case body 310 is formed in the shape of a rectangular tube that is long in the first direction. The case body 310 surrounds the multiple cell units 100 and the cover sheet 200.

[0031] 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 .

[0032] In this embodiment, each corner 302 is formed by three surfaces: two adjacent surfaces of the case body 310 and the lid 320. However, the corner 302 may be formed by a curved surface or the like, as long as it contacts the three surfaces of the two adjacent surfaces of the case body 310 and the lid 320. The "rectangular parallelepiped shape" that describes the outer shape of the cell case 300 also includes a shape in which the corner 302 is formed by a curved surface or the like as described above.

[0033] The external terminal 400 is provided on the lid 320. The external terminal 400 is connected to the current collecting terminal 140 of the endmost cell units 101, 103 that are located closest to the lid 320 among the multiple cell units 100.

[0034] The cell module 10 has an opposing corner 12 that faces the corner 302 of the cell casing 300. The opposing corner 12 includes the edge 202 of the covering sheet 200 in the orthogonal direction. The opposing corner 12 may include a corner of the endmost cell unit. The corner of the endmost cell unit refers to the corner of the endmost cell unit that faces the corner 302 of the cell casing 300. In this embodiment, the corner of the endmost cell unit is formed by the corner 162 of the laminate exterior body 160.

[0035] The adhesive member 500 is provided inside the cell casing 300. The adhesive member 500 is made of an insulating material. The adhesive member 500 may be made of a thermally conductive adhesive. The adhesive member 500 has corner adhesive portions 510, an upper adhesive portion 521, a lower adhesive portion 522, and a middle adhesive portion 530.

[0036] The corner adhesive portion 510 adheres the corner 302 of the cell casing 300 to the opposing corner 12. In this embodiment, the corner adhesive portion 510 adheres the corner 302 of the cell casing 300 to the edge 202 of the cover sheet 200.

[0037] The upper adhesive portion 521 bonds the cell case 300 and the upper covering portion 221. As shown in FIG. 5, the upper adhesive portion 521 is provided between the inner surface of the upper portion of the case body 310 and the upper surface of the upper covering portion 221. The upper adhesive portion 521 extends long in the orthogonal direction. The length of the upper adhesive portion 521 in the orthogonal direction may be the same as or shorter than the length of each cell unit 100 in the orthogonal direction. As shown in FIG. 3, the upper adhesive portion 521 is spaced apart from the corner adhesive portions 510.

[0038] 3 and 5, the upper adhesive portion 521 spans the upper ends of a pair of adjacent cell units adjacent to each other in the stacking direction. As shown in Fig. 5, the upper adhesive portion 521 may have a shape that convex toward the boundary (downward) between the pair of adjacent cell units adjacent to each other in the stacking direction. As shown in Fig. 5, the upper adhesive portion 521 is spaced from the corner between the top and side of the case body 310.

[0039] The lower adhesive portion 522 bonds the cell casing 300 and the lower covering portion 222. As shown in FIG. 5, the lower adhesive portion 522 is provided between the inner surface of the lower portion of the case body 310 and the lower surface of the lower covering portion 222. The lower adhesive portion 522 extends long in the orthogonal direction. The length of the lower adhesive portion 522 in the orthogonal direction may be the same as or shorter than the length of each cell unit 100 in the orthogonal direction. As shown in FIG. 3, the lower adhesive portion 522 is spaced apart from the corner adhesive portion 510.

[0040] 3 and 5, the lower adhesive portion 522 spans the lower ends of a pair of adjacent cell units adjacent to each other in the stacking direction. As shown in Fig. 5, the lower adhesive portion 522 may have a shape that convex toward the boundary (upward) between the pair of adjacent cell units adjacent to each other in the stacking direction. As shown in Fig. 5, the lower adhesive portion 522 is spaced from the corner between the bottom and side of the case body 310.

[0041] The intermediate adhesive portion 530 bonds the cell casing 300 and the surrounding portion 230. As shown in Figures 3 and 4, the intermediate adhesive portion 530 is provided between the inner surface of the case body 310 and the outer surface of the surrounding portion 230. As shown in Figures 3 and 4, the intermediate adhesive portion 530 is spaced apart from the upper adhesive portion 521. The intermediate adhesive portion 530 may also be spaced apart from the lower adhesive portion 522.

[0042] In this embodiment, adhesive member 500 has only corner adhesive portions 510, upper adhesive portion 521, lower adhesive portion 522, and intermediate adhesive portion 530. In other words, no adhesive member is provided on any portion of the inner surface of cell casing 300 other than the portions in contact with corner adhesive portion 510, upper adhesive portion 521, lower adhesive portion 522, and intermediate adhesive portion 530.

[0043] Next, a description will be given of a method for manufacturing the above-mentioned energy storage cell 1. This manufacturing method includes a covering step, an inserting step, and a supplying step.

[0044] In the covering step, a plurality of cell units 100 are covered with a covering sheet 200 .

[0045] In the insertion step, the cell module 10 is inserted into the case body 310 along the first direction.

[0046] Next, the supplying step will be described with reference to FIGS. 6 and 7. In the supplying step, adhesive material 501 that forms adhesive member 500 is supplied into cell casing 300. In the supplying step, a supplying tool 50 that can supply adhesive material 501 is used. Supplying tool 50 has a storage section 52 that can store adhesive material 501, and a discharge section 54 that discharges adhesive material 501. An example of the storage section 52 is a syringe. Discharge section 54 is formed in a cylindrical shape. A base end of discharge section 54 is connected to storage section 52. The length of discharge section 54 in the first direction is approximately the same as the length of case body 310 in the first direction.

[0047] In the supplying step, the discharge part 54 is inserted into the gap between the case body 310 and the cell module 10 arranged inside the case body 310. At this time, as shown in FIG. 7 , the discharge part 54 may be inserted between a corner of the case body 310 and a corner 250 of the covering sheet 200. Then, the adhesive material 501 stored in the storage part 52 is discharged from the discharge part 54 onto, for example, a corner 302 of the cell case 300. In this way, the corner adhesive part 510 is formed. The upper adhesive part 521, the lower adhesive part 522, and the middle adhesive part 530 are also formed by the same operation as above.

[0048] Then, the lid 320 is welded to the case body 310 to form the storage cell 1.

[0049] As described above, in the energy storage cell 1 of this embodiment, the corner portion 302 of the cell case 300 and the opposing corner portion 12 of the cell module 10 are bonded at the corner bonding portion 510, thereby effectively suppressing relative displacement of the cell module 10 with respect to the cell case 300.

[0050] Furthermore, since the upper covering portion 221 is adhered to the cell case 300 by the upper adhesive portion 521 and the lower covering portion 222 is adhered to the cell case 300 by the lower adhesive portion 522, relative displacement of the cell module 10 with respect to the cell case 300 is further suppressed.

[0051] In addition, since the surrounding portion 230 is bonded to the cell casing 300 by the intermediate adhesive portion 530, the relative displacement of the cell module 10 with respect to the cell casing 300 is further suppressed.

[0052] Modifications of the above embodiment will now be described.

[0053] <First Modification> As shown in FIG. 8, the corner adhesive portion 510 may adhere the corner 302 of the cell casing 300 to the edge 202 of the cover sheet 200 and the corner 162 of the endmost cell unit.

[0054] In this embodiment, since both the covering sheet 200 and the endmost cell unit are adhered to the cell casing 300 by the corner adhesive parts 510, the relative displacement of the cell module 10 with respect to the cell casing 300 is more reliably suppressed.

[0055] <Second Modification> 9, the upper adhesive portion 521 may bond the cell casing 300 to the upper covering portion 221 and each upper end portion 170 of the pair of adjacent cell units. In this example, a through hole h21 is provided in the upper covering portion 221. Therefore, the adhesive material supplied between the cell casing 300 and the upper covering portion 221 in the supplying step comes into contact with each upper end portion 170 of the pair of adjacent cell units through the through hole h21.

[0056] In this embodiment, since both the covering sheet 200 and the pair of adjacent cell units are adhered to the cell casing 300 by the upper adhesive parts 521, the relative displacement of the cell module 10 with respect to the cell casing 300 is more reliably suppressed.

[0057] <Third Modification> As in the second modified example, the lower adhesive portion 522 may adhere the cell casing 300 to the lower covering portion 222 and each lower end portion 180 of the pair of adjacent cell units. In this example, a through hole h22 is provided in the lower covering portion 222. Therefore, the adhesive material supplied between the cell casing 300 and the lower covering portion 222 in the supplying step comes into contact with each lower end portion 180 of the pair of adjacent cell units through the through hole h22.

[0058] <Fourth Modification> 8, the intermediate adhesive portion 530 may bond the cell casing 300 to the surrounding portion 230 and each current collecting terminal 140 in a pair of connected cell units. In this example, a through hole h23 is provided in the surrounding portion 230. Therefore, the adhesive material supplied between the cell casing 300 and the surrounding portion 230 in the supplying step covers each current collecting terminal 140 through the through hole h23.

[0059] In this embodiment, peeling of the current collecting terminals 140 due to vibration, etc. is suppressed. Furthermore, because the adhesive member 500 is made of an insulating material, the occurrence of a short circuit caused by the connection between the current collecting terminal 140 of the first cell unit 101 and the current collecting terminal 140 of the second cell unit 102 coming into contact with the connection between the current collecting terminal 140 of the third cell unit 103 and the current collecting terminal 140 of the fourth cell unit 104 is suppressed.

[0060] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0061] [Aspect 1] a cell module including a plurality of cell units; a cell case that houses the cell module; an adhesive member provided within the cell casing; The cell case is formed in a rectangular parallelepiped shape, the cell module has an opposing corner portion that faces a corner portion of the cell casing, The adhesive member includes a corner adhesive portion that adheres the corner portion and the opposing corner portion of the cell case.

[0062] In this energy storage cell, the corners of the cell case and the opposing corners of the cell module are bonded together at corner bonding sections, so that relative displacement of the cell module with respect to the cell case is effectively suppressed.

[0063] [Aspect 2] the cell module further includes a covering sheet that collectively covers the plurality of cell units, Each of the plurality of cell units comprises: The electrode body; a current collecting terminal protruding from the electrode body in a direction perpendicular to both the stacking direction and the up-down direction of the electrode body, 2. The energy storage cell according to claim 1, wherein the opposing corners include edges of the cover sheet in the orthogonal direction.

[0064] [Aspect 3] the plurality of cell units includes an endmost cell unit arranged at an end in the orthogonal direction, the endmost cell unit has a corner portion that faces the corner portion of the cell casing, the opposing corner portions further include the corner portions of the endmost cell units, The energy storage cell according to aspect 2, wherein the corner adhesive bonds the corner of the cell casing to the edge of the covering sheet and the corner of the endmost cell unit.

[0065] In this embodiment, since both the cover sheet and the endmost cell unit are adhered to the cell casing by the corner adhesive parts, the relative displacement of the cell module with respect to the cell casing is more reliably suppressed.

[0066] [Aspect 4] the plurality of cell units include a pair of adjacent cell units adjacent to each other in the stacking direction, the covering sheet includes upper covering portions that cover upper ends of the pair of adjacent cell units, 4. The energy storage cell according to claim 2, wherein the adhesive member includes an upper adhesive portion that adheres the cell casing and the upper cover portion to each other.

[0067] In this embodiment, the upper covering portion is adhered to the cell case by the upper adhesive portion, so that the relative displacement of the cell module with respect to the cell case is suppressed.

[0068] [Aspect 5] a through hole is provided in the upper covering portion, The energy storage cell according to aspect 4, wherein the upper adhesive portion bonds the cell casing to the upper covering portion and to the upper end portions of the pair of adjacent cell units.

[0069] In this embodiment, since both the upper covering portion and the pair of adjacent cell units are adhered to the cell case by the upper adhesive portion, the relative displacement of the cell module with respect to the cell case is more reliably suppressed.

[0070] [Aspect 6] the plurality of cell units include a pair of adjacent cell units adjacent to each other in the stacking direction, the covering sheet includes a lower covering portion that covers lower ends of the pair of adjacent cell units, 6. The energy storage cell according to any one of aspects 2 to 5, wherein the adhesive member includes a lower adhesive portion that bonds the cell casing and the lower covering portion together.

[0071] In this embodiment, the lower covering portion is adhered to the cell case by the lower adhesive portion, so that the relative displacement of the cell module with respect to the cell case is suppressed.

[0072] [Aspect 7] a through hole is provided in the lower covering portion, 7. The energy storage cell according to claim 6, wherein the lower adhesive portion bonds the cell casing to the lower covering portion and to the lower end portions of the pair of adjacent cell units.

[0073] In this embodiment, since both the lower covering portion and the pair of adjacent cell units are adhered to the cell case by the lower adhesive portion, the relative displacement of the cell module with respect to the cell case is more reliably suppressed.

[0074] [Aspect 8] the plurality of cell units includes a pair of connected cell units connected to each other in the orthogonal direction, the current collecting terminal of one of the pair of connected cell units is connected to the current collecting terminal of the other of the pair of connected cell units, the covering sheet includes an enclosing portion that encloses each of the current collecting terminals in the pair of connected cell units, 8. The energy storage cell according to any one of aspects 2 to 7, wherein the adhesive member includes an intermediate adhesive portion that bonds the cell casing and the surrounding portion together.

[0075] In this aspect, since the surrounding portion is bonded to the cell case by the intermediate adhesive portion, relative displacement of the cell module with respect to the cell case is suppressed.

[0076] [Aspect 9] The surrounding portion is provided with a through hole, 9. The energy storage cell according to aspect 8, wherein the intermediate adhesive portion bonds the cell casing to the surrounding portion and to each of the current collecting terminals in the pair of connected cell units.

[0077] In this embodiment, separation of the current collecting terminals from each other due to vibration or the like is suppressed.

[0078] [Aspect 10] 10. The energy storage cell according to any one of aspects 1 to 9, wherein the adhesive member is made of a thermally conductive adhesive.

[0079] In this embodiment, the cell unit is effectively cooled by cooling the cell case.

[0080] [Aspect 11] A method for producing the energy storage cell according to any one of aspects 1 to 10, comprising: an insertion step of inserting the cell module into the cell case; a supplying step of supplying an adhesive material that forms the adhesive member into the cell casing, In the supplying step, a supply tool is used that has a storage portion capable of storing the adhesive material and a discharge portion connected to the storage portion that discharges the adhesive material, and the adhesive material is supplied to the corner of the cell case by inserting the discharge portion between the corner of the cell case and the cell module.

[0081] 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]

[0082] 1 storage cell, 10 cell module, 12 opposing corner portion, 50 supply tool, 52 storage portion, 54 discharge portion, 100 cell unit, 101 first cell unit, 102 second cell unit, 103 third cell unit, 104 fourth cell unit, 110 electrode body, 140 current collecting terminal, 160 laminated outer casing, 162 corner portion, 170 upper end portion, 180 lower end portion, 200 covering sheet, 202 edge portion, 221 upper covering portion, 222 lower covering portion, 230 surrounding portion, 300 cell case, 302 corner portion, 310 case body, 320 lid, 400 external terminal, 500 adhesive member, 510 corner adhesive portion, 521 upper adhesive portion, 522 lower adhesive portion, 530 intermediate adhesive portion.

Claims

1. a cell module including a plurality of cell units; a cell case that houses the cell module; an adhesive member provided within the cell casing; The cell case is formed in a rectangular parallelepiped shape, the cell module has an opposing corner portion that faces a corner portion of the cell casing, The adhesive member includes a corner adhesive portion that adheres the corner portion and the opposing corner portion of the cell case.

2. the cell module further includes a covering sheet that collectively covers the plurality of cell units, Each of the plurality of cell units comprises: An electrode body; a current collecting terminal protruding from the electrode body in a direction perpendicular to both the stacking direction and the up-down direction of the electrode body, The energy storage cell according to claim 1 , wherein the opposing corners include edges of the cover sheet in the orthogonal direction.

3. the plurality of cell units includes an endmost cell unit arranged at an end in the orthogonal direction, the endmost cell unit has a corner portion that faces the corner portion of the cell casing, the opposing corner portions further include the corner portions of the endmost cell units, The energy storage cell according to claim 2 , wherein the corner adhesive portion bonds the corner of the cell casing to the edge of the covering sheet and the corner of the endmost cell unit.

4. the plurality of cell units include a pair of adjacent cell units adjacent to each other in the stacking direction, the covering sheet includes upper covering portions that cover upper ends of the pair of adjacent cell units, The energy storage cell according to claim 2 , wherein the adhesive member includes an upper adhesive portion that adheres the cell casing and the upper covering portion together.

5. a through hole is provided in the upper covering portion, The energy storage cell according to claim 4 , wherein the upper adhesive portion bonds the cell casing to the upper covering portion and to the upper end portions of the pair of adjacent cell units.

6. the plurality of cell units include a pair of adjacent cell units adjacent to each other in the stacking direction, the covering sheet includes a lower covering portion that covers lower ends of the pair of adjacent cell units, The energy storage cell according to claim 2 , wherein the adhesive member includes a lower adhesive portion that adheres the cell casing and the lower covering portion together.

7. a through hole is provided in the lower covering portion, The energy storage cell according to claim 6 , wherein the lower adhesive portion bonds the cell casing to the lower covering portion and to the lower end portions of the pair of adjacent cell units.

8. the plurality of cell units includes a pair of connected cell units connected to each other in the orthogonal direction, the current collecting terminal of one of the pair of connected cell units is connected to the current collecting terminal of the other of the pair of connected cell units, the covering sheet includes an enclosing portion that encloses each of the current collecting terminals in the pair of connected cell units, The energy storage cell according to claim 2 , wherein the adhesive member includes an intermediate adhesive portion that bonds the cell casing and the surrounding portion together.

9. The surrounding portion is provided with a through hole, The energy storage cell according to claim 8 , wherein the intermediate adhesive portion bonds the cell casing to the surrounding portion and to each of the current collecting terminals in the pair of connected cell units.

10. The energy storage cell according to claim 1 , wherein the adhesive member is made of a thermally conductive adhesive.

11. A method for manufacturing the storage cell according to claim 1, an insertion step of inserting the cell module into the cell case; a supplying step of supplying an adhesive material that forms the adhesive member into the cell casing, In the supplying step, a supply tool is used that has a storage portion capable of storing the adhesive material and a discharge portion connected to the storage portion that discharges the adhesive material, and the adhesive material is supplied to the corner of the cell case by inserting the discharge portion between the corner of the cell case and the cell module.

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