Power storage cell and power storage module equipped with the same

Abstract

To increase the capacity of a power storage module equipped with a power storage cell, thereby improving the heat dissipation of the power storage cell.SOLUTION: A power storage cell 10 comprises a wound electrode body 100 and a cell case 200. The cell case 200 has an outer peripheral wall part 210, a first end 220, a second end 230, and an inner peripheral wall part 240. The first end 220 has a first hole part 221 penetrating the cell case in an axial direction Z. The second end 230 has a second hole part 231 penetrating the cell case in the axial direction Z. The inner peripheral wall part 240 extends from the first hole part 221 to the second hole part 231. The inner peripheral wall part 240 is disposed on the inner side in a radial direction R of the wound electrode body 100. A portion, of the outer peripheral wall part 210, which is aligned with the wound electrode body 100 in the radial direction R has a rectangular cylindrical outer shape. A portion, of the inner peripheral wall part 240, which is aligned with the wound electrode body 100 in the radial direction R has a rectangular cylindrical outer shape.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an energy storage cell and an energy storage module including the same. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2001-093566 (Patent Document 1) discloses a cylindrical battery characterized in that the core material of the cylindrical battery is made of a hollow material, and air can pass through the hollow part of this hollow material. Patent Document 1 states that the above configuration can promote the heat dissipation effect and prevent the performance deterioration of the cylindrical battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-093566 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order to increase the capacity of a power storage module, it is necessary to arrange a plurality of power storage cells as densely as possible within the power storage module.

[0005] Here, the battery disclosed in Patent Document 1 is described as being designed to promote heat dissipation. However, when multiple power storage cells are arranged more densely in a power storage module, the heat dissipation effect provided by the hollow portion described in Patent Document 1 cannot be said to be sufficient.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a storage cell and a storage module including the same, which can increase the capacity of a storage module including the storage cell and improve the heat dissipation properties of the storage cell. [Means for solving the problem]

[0007] The energy storage cell according to the present disclosure includes a wound electrode body and a cell case. The cell case houses the wound electrode body. The cell case has an outer peripheral wall portion, a first end portion, a second end portion, and an inner peripheral wall portion. The outer peripheral wall portion is cylindrical and is disposed on the outside in the radial direction of the wound electrode body. The first end portion is connected to one side of the outer peripheral wall portion in the axial direction of the wound electrode body. The first end portion is connected to one side of the outer peripheral wall portion in the axial direction of the wound electrode body. The first end portion has a first hole portion penetrating in the axial direction. The second end portion is connected to the other side of the outer peripheral wall portion in the axial direction. The second end portion has a second hole portion penetrating in the axial direction. The inner peripheral wall portion extends from the first hole portion to the second hole portion. The inner peripheral wall portion is disposed on the inside in the radial direction of the wound electrode body. A portion of the outer peripheral wall portion aligned with the wound electrode body in the radial direction has a rectangular cylindrical outer shape. The portion of the inner circumferential wall that is aligned with the wound electrode body in the radial direction has a rectangular tubular outer shape. Effect of the Invention

[0008] According to the present disclosure, it is possible to increase the capacity of a power storage module including power storage cells, and to improve the heat dissipation properties of the power storage cells. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a storage cell according to a first embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view of the storage cell of FIG. 1 as viewed from the direction of the arrows along line II-II. [Diagram 3] 1 is a cross-sectional view illustrating a schematic diagram of an electricity storage module according to a first embodiment of the present disclosure. [Figure 4] 1 is a perspective view showing a plurality of power storage cells included in a power storage module according to a first embodiment of the present disclosure. [Diagram 5] 1 is a partial cross-sectional view showing a part of an electricity storage module according to a first embodiment of the present disclosure. [Figure 6]FIG. 4 is a cross-sectional view showing an electricity storage module according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference characters, and the description thereof will not be repeated.

[0011] (Embodiment 1) First, a storage cell according to the first embodiment of the present disclosure will be described. The storage cell described below is, for example, a lithium ion battery mounted on a vehicle. Note that the use and type of the storage cell are not limited to the above example.

[0012] Fig. 1 is a perspective view of a storage cell according to a first embodiment of the present disclosure, and Fig. 2 is a cross-sectional view of the storage cell of Fig. 1 as viewed from the direction of the arrows along line II-II.

[0013] As shown in Figures 1 and 2, the energy storage cell 10 is a rectangular cylindrical battery. In this specification, the term "rectangle" may include a square, a rectangle, and a substantially square or rectangle having rounded corners. That is, the term "rectangle" in this specification may have two sets of sides that are substantially parallel to each other. The energy storage cell 10 includes a wound electrode body 100 and a cell case 200.

[0014] 2, the wound electrode body 100 includes a positive electrode plate 110, a negative electrode plate 120, a separator 130, a positive electrode tab lead 140, and a negative electrode tab lead 150. The separator 130 is provided between the positive electrode plate 110 and the negative electrode plate 120. The separator 130 separates the positive electrode plate 110 and the negative electrode plate 120 while allowing ions (e.g., lithium ions) to move between the positive electrode plate 110 (positive electrode active material) and the negative electrode plate 120 (negative electrode active material). The wound electrode body 100 is composed of an electrode plate group in which the positive electrode plate 110 and the negative electrode plate 120 are wound with the separator 130 interposed therebetween.

[0015] The positive electrode plate 110 includes a positive electrode current collector and a positive electrode composite layer. The positive electrode composite layer is applied to a portion of the positive electrode current collector. That is, the positive electrode current collector includes a coated portion to which the positive electrode composite layer is applied and an uncoated portion to which the positive electrode composite layer is not applied.

[0016] The positive electrode current collector is made of, for example, aluminum. The positive electrode mixture layer is formed by applying a positive electrode slurry to the surface of the positive electrode current collector and drying it. The positive electrode slurry is prepared by kneading the materials for the positive electrode mixture layer (such as a positive electrode active material and a binder) with a solvent. The positive electrode mixture layer is in close contact with the separator 130. The thickness of the positive electrode mixture layer is, for example, 0.1 μm or more and 1000 μm or less.

[0017] The negative electrode plate 120 includes a negative electrode current collector and a negative electrode composite layer. The negative electrode composite layer is applied to a portion of the negative electrode current collector. That is, the negative electrode current collector includes a coated portion to which the negative electrode composite layer is applied and an uncoated portion to which the negative electrode composite layer is not applied.

[0018] The negative electrode current collector is made of, for example, copper foil. The negative electrode mixture layer is formed by applying a negative electrode slurry to the surface of the negative electrode current collector and drying it. The negative electrode slurry is a slurry prepared by kneading the materials of the negative electrode mixture layer (negative electrode active material, binder, etc.) with a solvent. The negative electrode mixture layer is in close contact with the separator 130. The thickness of the negative electrode mixture layer is, for example, 0.1 μm or more and 1000 μm or less.

[0019] The positive electrode tab lead 140 is provided so as to protrude from the positive electrode current collector of the positive electrode plate 110 to one side in the axial direction Z (the Z1 side).

[0020] The negative electrode tab lead 150 is provided so as to protrude from the negative electrode current collector of the negative electrode plate 120 to the other side in the axial direction Z (the Z2 side).

[0021] The cell case 200 houses the wound electrode assembly 100. The cell case 200 has a substantially rectangular tubular outer shape, so that the energy storage cell 10 is a rectangular tubular battery.

[0022] The cell casing 200 has an outer peripheral wall portion 210 , a first end portion 220 , a second end portion 230 , and an inner peripheral wall portion 240 .

[0023] The outer peripheral wall portion 210 is cylindrical and is disposed on the outside of the wound electrode body 100 in the radial direction R. A portion of the outer peripheral wall portion 210 aligned with the wound electrode body 100 in the radial direction R has a rectangular cylindrical outer shape. The outer peripheral wall portion 210 is formed of copper, aluminum, or the like. The outer peripheral wall portion 210 is in contact with a negative electrode current collector of the negative electrode plate 120 provided on the outermost periphery of the wound electrode body 100.

[0024] The first end 220 is connected to one side (Z1 side) of the outer peripheral wall portion 210 in the axial direction Z of the wound electrode body 100. The first end 220 is connected to one side (Z1 side) of the outer peripheral wall portion 210 in the axial direction Z of the wound electrode body 100. The first end 220 has a first hole portion 221 that penetrates in the axial direction Z.

[0025] Specifically, the first end portion 220 includes an outer cap 222 , an insulating layer 223 , and a crimping portion 224 .

[0026] The external cap 222 functions as an external terminal by being electrically connected to a bus bar (described in detail later). The external cap 222 is provided with a weak portion 225 (thin portion). When the internal pressure of the cell case 200 increases, the external cap 222 is easily broken starting from the weak portion 225. This allows gas to be quickly discharged to the outside of the cell case 200. The first hole portion 221 is provided in the external cap 222. The external cap 222 is made of copper, aluminum, or the like.

[0027] The insulating layer 223 is disposed so as to cover the outer peripheral edge of the outer cap 222. The insulating layer 223 is provided so as to insulate the outer cap 222 from the crimping portion 224.

[0028] The crimping portion 224 is connected to one side of the outer peripheral wall portion 210 in the axial direction Z of the wound electrode body 100. The crimping portion 224 is molded integrally with the outer peripheral wall portion 210. The crimping portion 224 crimps the outer peripheral edge of the outer cap 222 (and the conductive film 510 described later) via the insulating layer 223. The crimping portion 224 is formed of copper, aluminum, or the like.

[0029] The second end portion 230 is connected to the other side of the outer circumferential wall portion 210 in the axial direction Z. The second end portion 230 has a second hole portion 231 penetrating therethrough in the axial direction Z.

[0030] The second end 230 has a rectangular plate-like outer shape. The second end 230 is formed of copper, aluminum, or the like. The periphery of the second end 230 is connected to the outer peripheral wall portion 210. The second end 230 is molded integrally with the outer peripheral wall portion.

[0031] The second end 230 is in contact with the negative electrode tab lead 150. This electrically connects the negative electrode tab lead 150 and the second end 230. As a result, the second end 230, the outer circumferential wall portion 210 connected to the second end 230, and the crimped portion 224 are negatively charged.

[0032] The inner circumferential wall portion 240 extends from the first hole portion 221 to the second hole portion 231. The inner circumferential wall portion 240 is disposed on the inside in the radial direction R of the wound electrode body 100. Of the inner circumferential wall portion 240, a portion aligned with the wound electrode body 100 in the radial direction R has a rectangular tubular outer shape.

[0033] The inner circumferential wall portion 240 has a core portion 241 , a first insulating end portion 242 , and a second insulating end portion 243 .

[0034] The core portion 241 has a rectangular tubular outer shape. The core portion 241 is disposed on the inside in the radial direction R of the wound electrode body 100. The core portion 241 may be used as a core material when the electrode plate group is wound to form the wound electrode body 100. From the viewpoint of heat dissipation, the core portion 241 is preferably formed of a metal such as copper or aluminum.

[0035] The first insulating end 242 is disposed on one side (Z1 side) of the core 241. The first insulating end 242 insulates the core 241 from the first end 220 (external cap 222). The core 241 is connected to the first end 220 (external cap 222) via the first insulating end 242.

[0036] The second insulating end 243 is disposed on the other side (Z2 side) of the core 241. The second insulating end 243 insulates the core 241 from the second end 230. The core 241 is connected to the second end 230 via the second insulating end 243.

[0037] The energy storage cell 10 further includes a positive insulating plate 300, a negative insulating plate 400, and a CID (Current Interrupt Device) 500.

[0038] The positive side insulating plate 300 is housed in the cell case 200. The positive side insulating plate 300 is provided so as to insulate the wound electrode body 100 (the negative electrode plate 120 and the separator 130) from the cell case 200. The positive side insulating plate 300 is provided so as to cover the positive electrode plate 110, the negative electrode plate 120, and the separator 130 from one side (Z1 side).

[0039] The positive-side insulating plate 300 has a first through hole 310 and a second through hole 320. The positive electrode tab lead 140 is inserted into the first through hole 310, and is thereby in contact with a conductive film 510, which will be described later. This electrically connects the positive electrode tab lead 140 and the conductive film 510. The inner circumferential wall portion 240 (core portion 241) is inserted into the second through hole 320.

[0040] The negative insulating plate 400 is housed in the cell case 200. The negative insulating plate 400 is provided so as to insulate the wound electrode body 100 (the positive electrode plate 110 and the separator 130) from the cell case 200. The negative insulating plate 400 is provided so as to cover the positive electrode plate 110, the negative electrode plate 120, and the separator 130 from the other side (Z2 side).

[0041] The negative insulating plate 400 has a through hole 410. The negative tab lead 150 is inserted into the through hole 410. This electrically connects the negative tab lead 150 and the second end 230. The inner circumferential wall portion 240 (the core portion 241 and the second insulating end portion 243) is also inserted into the through hole 410.

[0042] The CID 500 is an element that cuts off a current path by utilizing an increase in cell internal pressure caused by gas generated due to overcharging of the storage cell 10. The CID 500 is provided so as to seal an opening on one side (Z1 side) of the outer circumferential wall portion 210. The CID 500 has a conductive film 510, a gasket 520, and a bottom disk 530.

[0043] The conductive film 510 is provided so as to seal an opening on one side (Z1 side) of the outer peripheral wall portion 210. The conductive film 510 is in contact with the positive electrode tab lead 140. As a result, the conductive film 510 is positively charged. The conductive film 510 is also electrically connected to the external cap 222 by a connection member (not shown). As a result, the external cap 222 is also positively charged.

[0044] The conductive film 510 has a weak portion 511 (thin portion) similar to the external cap 222. When the internal pressure of the cell case 200 increases, the conductive film 510 is easily broken from the weak portion 511. When the conductive film 510 breaks due to the increase in internal pressure, the contact between the conductive film 510 and the positive electrode tab lead 140 is released. As a result, the positive charge of the conductive film 510 is released, and the positive charge of the external cap 222 is also released. As a result, charging and discharging of the energy storage cell 10 is stopped.

[0045] The gasket 520 is located on the wound electrode body 100 side of the conductive film 510. The bottom disk 530 is connected to the conductive film 510 via the gasket 520.

[0046] Of the inner circumferential wall portion 240, the core portion 241 and the first insulating end portion 242 penetrate the CID 500. Specifically, the core portion 241 and the first insulating end portion 242 penetrate the conductive film 510, the gasket 520, and the bottom disk 530.

[0047] Next, the energy storage module according to the first embodiment of the present disclosure will be described. Fig. 3 is a cross-sectional view that shows a schematic diagram of the energy storage module according to the first embodiment of the present disclosure. Fig. 4 is a perspective view that shows a plurality of energy storage cells included in the energy storage module according to the first embodiment of the present disclosure. Fig. 5 is a partial cross-sectional view that shows a part of the energy storage module according to the first embodiment of the present disclosure. In Fig. 3, the cross-sectional view of the energy storage cell 10 is shown typically.

[0048] As shown in FIGS. 3 to 5, the power storage module 1 according to the first embodiment of the present disclosure includes one or more power storage cells 10 and one or more cooling members 20.

[0049] The energy storage module 1 according to this embodiment includes a plurality of energy storage cells 10. The plurality of energy storage cells 10 are arranged such that the axial directions Z of the wound electrode bodies 100 in the respective energy storage cells 10 are parallel to one another. In each of the plurality of energy storage cells 10, a flat portion of the outer peripheral wall portion 210 faces a flat portion of the outer peripheral wall portion 210 of the other adjacent energy storage cell 10. The plurality of energy storage cells 10 are arranged such that these flat portions are parallel to one another.

[0050] For each energy storage cell 10, each of the multiple cooling members 20 is arranged further inside the inner circumferential wall portion 240 in the radial direction R of the energy storage cell 10. The cooling members 20 are in contact with the inner circumferential wall portion 240 of the energy storage cell 10. The cooling members 20 extend from the inside of the first hole portion 221 to the inside of the second hole portion 231 along the axial direction Z of the corresponding energy storage cell 10. The cooling members 20 are arranged so as to penetrate the energy storage cell 10 in the axial direction Z.

[0051] The cooling member 20 has a metal portion 21, a first insulating coating portion 22, and a second insulating coating portion .

[0052] The metal portion 21 is made of a metal such as aluminum or copper. The metal portion 21 extends from the inside of the first hole portion 221 to the inside of the second hole portion 231 along the axial direction Z of the corresponding energy storage cell 10. A portion of the metal portion 21 aligned in the radial direction R with the wound electrode body 100 of the corresponding energy storage cell 10 constitutes at least a part of the outer surface of the cooling member 20. The metal portion 21 is in contact only with the core portion 241 of the inner circumferential wall portion 240.

[0053] The first insulating coating portion 22 coats a part of the outer surface of the metal portion 21 in the radial direction R. The first insulating coating portion 22 contacts a first end portion 220 of the corresponding energy storage cell 10. The first insulating coating portion 22 electrically insulates the first end portion 220 and the metal portion 21 from each other.

[0054] The second insulating coating portion 23 coats another part of the outer surface of the metal portion 21 in the radial direction R. The second insulating coating portion 23 contacts a second end portion 230 of the corresponding energy storage cell 10. The second insulating coating portion 23 electrically insulates the second end portion 230 and the metal portion 21 from each other.

[0055] The energy storage module 1 may further include one or more first bus bars 30 and a second bus bar 40. The first bus bar and / or the second bus bar 40 electrically connect two or more energy storage cells 10 together.

[0056] The one or more first bus bars 30 are electrically connected to first ends 220 of the multiple storage cells 10. The one or more second bus bars 40 are electrically connected to second ends 230 of the multiple storage cells 10. When the energy storage module 1 includes multiple first bus bars 30 and multiple second bus bars 40, the first bus bars 30 may be electrically connected to other first bus bars 30. The second bus bars 40 may be electrically connected to other second bus bars 40. The first bus bars 30 may be electrically connected to the second bus bars 40 connected to the energy storage cells 10 to which the first bus bars 30 are not connected.

[0057] The power storage module 1 further includes a first heat transfer section 50 and a second heat transfer section 60. The first heat transfer section 50 is connected to one end of each cooling member 20 (metal section 21). The second heat transfer section 60 is connected to the other end of each cooling member 20 (metal section 21). The first heat transfer section 50 and the second heat transfer section 60 function to help dissipate heat transferred from the power storage cells 10 to each cooling member 20 (metal section 21) to the outside of the power storage module 1. The first heat transfer section 50 and the second heat transfer section 60 may also be made of a metal such as aluminum or copper.

[0058] The power storage module 1 may further include a first insulating plate 70 and a second insulating plate 80. The first insulating plate 70 is disposed between the first bus bar 30 and the first heat transfer section 50, and electrically insulates them. The second insulating plate 80 is disposed between the second bus bar 40 and the second heat transfer section 60, and electrically insulates them.

[0059] The energy storage module 1 further includes a module case 90. The module case 90 houses a plurality of energy storage cells 10, a plurality of cooling members 20, a first bus bar 30, a second bus bar 40, a first heat transfer section 50, a second heat transfer section 60, a first insulating plate 70, and a second insulating plate 80.

[0060] 3, the module case 90 has a lower case 91 having an opening, and an upper case 92 that seals the opening of the lower case 91. However, the module case 90 does not have to have the upper case 92. In this case, the opening of the lower case 91 may be sealed by the first heat transfer section 50 or the first insulating plate 70.

[0061] As described above, the energy storage cell 10 according to the first embodiment of the present disclosure includes the wound electrode body 100 and the cell case 200. The cell case 200 houses the wound electrode body 100. The cell case 200 has an outer peripheral wall portion 210, a first end portion 220, a second end portion 230, and an inner peripheral wall portion 240. The outer peripheral wall portion 210 is cylindrical and is disposed on the outside in the radial direction R of the wound electrode body 100. The first end portion 220 is connected to one side of the outer peripheral wall portion 210 in the axial direction Z of the wound electrode body 100. The first end portion 220 is connected to one side of the outer peripheral wall portion 210 in the axial direction Z of the wound electrode body 100. The first end portion 220 has a first hole portion 221 penetrating in the axial direction Z. The second end portion 230 is connected to the other side of the outer peripheral wall portion 210 in the axial direction Z. The second end 230 has a second hole 231 penetrating in the axial direction Z. The inner circumferential wall 240 extends from the first hole 221 to the second hole 231. The inner circumferential wall 240 is disposed on the inside in the radial direction R of the wound electrode body 100. Of the outer circumferential wall 210, a portion aligned with the wound electrode body 100 in the radial direction R has a rectangular tubular outer shape. Of the inner circumferential wall 240, a portion aligned with the wound electrode body 100 in the radial direction R has a rectangular tubular outer shape.

[0062] According to the above configuration, the portion of the outer peripheral wall portion 210 has a rectangular tubular outer shape, so that the plurality of storage cells 10 can be densely arranged in the energy storage module 1 (see FIG. 4). Since the energy storage cells 10 can be densely arranged, the space within the cell case 200 per storage cell 10 can be made large in the energy storage module 1. Therefore, in the energy storage module 1, the size of the wound electrode body 100 per storage cell 10 can be increased, and the capacity of the entire energy storage module 1 can be increased.

[0063] Furthermore, according to the above configuration, since the above-mentioned portion of the inner circumferential wall portion 240 has a rectangular tubular outer shape, the wound electrode body 100 can easily be shaped to fit the outer circumferential wall portion 210. Also, since the above-mentioned portion of the inner circumferential wall portion 240 has a rectangular tubular outer shape, the outer surface area of ​​the inner circumferential wall portion 240 is relatively increased. Therefore, even when a plurality of energy storage cells 10 are densely arranged, the heat dissipation from the inner circumferential wall portion 240 can be improved.

[0064] Therefore, the energy storage cell 10 having the above-described configuration can increase the capacity of the energy storage module 1 including the energy storage cell 10, and can improve the heat dissipation performance of the energy storage cell 10.

[0065] Moreover, the energy storage module 1 according to the first embodiment of the present disclosure includes one or more energy storage cells 10 and a cooling member 20. The cooling member 20 is disposed further inside the inner circumferential wall portion 240 in the radial direction R of the energy storage cell 10. The cooling member 20 has a metal portion 21. The metal portion 21 is made of metal. The metal portion 21 extends from the inside of the first hole portion 221 to the inside of the second hole portion 231 along the axial direction Z of the corresponding energy storage cell 10. A portion of the metal portion 21 aligned in the radial direction R with the wound electrode body 100 of the corresponding energy storage cell 10 constitutes at least a part of the outer surface of the cooling member 20.

[0066] According to the above configuration, heat generated from the power storage cells 10 is easily released via the metal part 21. Therefore, the cooling efficiency of the power storage cells 10 in the power storage module 1 can be further improved.

[0067] (Embodiment 2) Hereinafter, a description will be given of an electricity storage module according to a second embodiment of the present disclosure. The electricity storage module according to the second embodiment of the present disclosure differs from the electricity storage module 1 according to the first embodiment of the present disclosure mainly in the configuration of the cooling member. Therefore, the description of the same configuration as the electricity storage module 1 according to the first embodiment of the present disclosure and its effects will not be repeated.

[0068] Fig. 6 is a cross-sectional view showing an electricity storage module according to embodiment 2 of the present disclosure. In Fig. 6, the electricity storage module according to embodiment 2 is shown in a cross-sectional view similar to that of the electricity storage module 1 of embodiment 1 in Fig. 3.

[0069] 6, in an energy storage module 1a according to embodiment 2 of the present disclosure, the cooling member 20a extends from the inside of the first hole 221 to the inside of the second hole 231 along the axial direction (Z) of the corresponding energy storage cell 10. The cooling member 20a is configured to allow a refrigerant C to flow therethrough in the axial direction (Z).

[0070] According to the above configuration, by flowing the refrigerant C through the cooling member 20a, heat generated from the power storage cells 10 is easily released through the cooling member 20a. This makes it possible to further improve the cooling efficiency of the power storage cells 10 in the power storage module 1a.

[0071] More specifically, in each cooling member 20a, the metal part 21a is configured to allow the refrigerant C to flow therethrough in the axial direction Z. The first heat transfer part 50a and the second heat transfer part 60a may be configured to allow the refrigerant C to be accommodated therein. The first heat transfer part 50a and the second heat transfer part 60a may be configured to allow the refrigerant C to flow in and out of the interiors of the first heat transfer part 50a and the second heat transfer part 60a and the interior of the cooling member 20a (metal part 21a). The first heat transfer part 50a and the second heat transfer part 60a may further have a function as a cooler for cooling the refrigerant C.

[0072] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0073] REFERENCE SIGNS LIST 1, 1a Energy storage module, 10 Energy storage cell, 20, 20a Cooling member, 21, 21a Metal portion, 22 First insulating covering portion, 23 Second insulating covering portion, 30 First bus bar, 40 Second bus bar, 50, 50a First heat transfer portion, 60, 60a Second heat transfer portion, 70 First insulating plate, 80 Second insulating plate, 90 Module case, 91 Lower case, 92 Upper case, 100 Wound electrode body, 110 Positive electrode plate, 120 Negative electrode plate, 130 Separator, 140 Positive electrode tab lead, 150 Negative electrode tab lead, 200 Cell case, 210 Outer peripheral wall portion, 220 First end portion, 221 First hole portion, 222 Outer cap, 223 Insulating layer, 224 Crimping portion, 230 Second end portion, 231 Second hole portion, 240 Inner peripheral wall portion, 241 core portion, 242 first insulating end portion, 243 second insulating end portion, 300 positive side insulating plate, 310 first through hole, 320 second through hole, 400 negative side insulating plate, 410 through hole, 500 CID, 510 conductive film, 520 gasket, 530 bottom disk, C refrigerant.

Claims

1. A wound electrode body; A cell case that houses the wound electrode body, The cell casing comprises: A cylindrical outer circumferential wall portion disposed radially outward of the wound electrode body; a first end portion connected to one side of the outer peripheral wall portion in the axial direction of the wound electrode body and having a first hole portion penetrating in the axial direction; a second end portion connected to the other side of the outer circumferential wall portion in the axial direction and having a second hole portion penetrating in the axial direction; an inner circumferential wall portion extending from the first hole portion to the second hole portion and disposed on the inside in the radial direction of the wound electrode body, A portion of the outer peripheral wall portion aligned with the wound electrode body in the radial direction has a rectangular tubular outer shape, The energy storage cell, wherein a portion of the inner circumferential wall portion aligned with the wound electrode body in the radial direction has an outer shape of a rectangular tube.

2. One or more of the storage cells according to claim 1; a cooling member disposed further inside the inner circumferential wall portion of the power storage cell in the radial direction of the power storage cell, the cooling member has a metal portion made of a metal, the metal portion extends from an inside of the first hole portion to an inside of the second hole portion along the axial direction of the corresponding energy storage cell, a portion of the metal portion that is aligned in the radial direction with the wound electrode body of the corresponding energy storage cell constitutes at least a part of an outer surface of the cooling member.

3. One or more of the storage cells according to claim 1; a cooling member disposed further inside the inner circumferential wall portion in the radial direction of the power storage cell, The cooling member extends from the inside of the first hole portion to the inside of the second hole portion along the axial direction of the corresponding energy storage cell, and is configured to allow a coolant to flow therethrough in the axial direction.

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