Energy storage module

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 a storage battery cell and a storage battery module including the same.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2001-093566 (Patent Document 1) discloses a cylindrical battery characterized in that the core material of the cylindrical battery is a hollow material and air can pass through the hollow portion of the hollow material. Patent Document 1 describes that with the above configuration, the heat dissipation effect can be promoted and the deterioration of the performance of the cylindrical battery can be prevented.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to increase the capacity of a storage battery module, it is required to arrange a plurality of storage battery cells as closely as possible in the storage battery module.

[0005] Here, it is described that the battery disclosed in Patent Document 1 aims to promote the heat dissipation effect. However, when arranging a plurality of storage battery cells more closely in a storage battery module, the heat dissipation effect by the hollow portion described in Patent Document 1 is not sufficient.

[0006] The present disclosure has been made in view of the above problems, and an object thereof is to provide a storage battery cell and a storage battery module including the same, which can increase the capacity of the storage battery module including the storage battery cell and improve the heat dissipation property of the storage battery cell.

Means for Solving the Problems

[0007] A storage cell according to this disclosure comprises a wound electrode body and a cell case. The cell case houses the wound electrode body. The cell case has an outer peripheral wall, a first end, a second end, and an inner peripheral wall. The outer peripheral wall is cylindrical and is located on the outside of the wound electrode body in the radial direction. The first end is connected to one side of the outer peripheral wall in the axial direction of the wound electrode body. The first end has a first hole that penetrates in the axial direction. The second end is connected to the other side of the outer peripheral wall in the axial direction. The second end has a second hole that penetrates in the axial direction. The inner peripheral wall extends from the first hole to the second hole. The inner peripheral wall is located on the inside of the wound electrode body in the radial direction. Of the outer peripheral wall, the portion that aligns with the wound electrode body in the radial direction has a rectangular cylindrical shape. Of the inner circumferential wall portion, the portion that aligns with the wound electrode body in the radial direction has a rectangular cylindrical outer shape. [Effects of the Invention]

[0008] According to this disclosure, the capacity of an energy storage module equipped with energy storage cells can be increased, and the heat dissipation performance of the energy storage cells can be improved. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of the energy storage cell according to Embodiment 1 of the present disclosure. [Figure 2] Figure 1 is a cross-sectional view of the energy storage cell as seen from the direction of the arrow on line II-II. [Figure 3] This is a schematic cross-sectional view showing an energy storage module according to Embodiment 1 of the present disclosure. [Figure 4] A perspective view showing multiple energy storage cells included in an energy storage module according to Embodiment 1 of this disclosure. [Figure 5] This is a partial cross-sectional view showing a part of the energy storage module according to Embodiment 1 of this disclosure. [Figure 6]This is a cross-sectional view showing an energy storage module according to Embodiment 2 of the present disclosure. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0011] (Embodiment 1) First, let's describe the energy storage cell according to Embodiment 1 of this disclosure. The energy storage cell described below is, for example, a lithium-ion battery installed in a vehicle. However, the applications and types of energy storage cells are not limited to the above example.

[0012] Figure 1 is a perspective view of an energy storage cell according to Embodiment 1 of this disclosure. Figure 2 is a cross-sectional view of the energy storage cell of Figure 1 taken from the direction of the arrow line II-II.

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

[0014] As shown in Figure 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 (positive electrode active material) and the negative electrode plate 120 (negative electrode active material) while allowing ions (e.g., lithium ions) to move between them. 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 together via the separator 130.

[0015] The positive electrode plate 110 includes a positive electrode current collector and a positive electrode composite material layer. The positive electrode composite material layer is coated on a part of the positive electrode current collector. That is, the positive electrode current collector includes a coated portion where the positive electrode composite material layer is coated and an uncoated portion where the positive electrode composite material layer is not coated.

[0016] For the positive electrode current collector, for example, aluminum or the like is used. The positive electrode composite material layer is formed by coating the positive electrode slurry on the surface of the positive electrode current collector and drying it. The positive electrode slurry is a slurry prepared by kneading the materials of the positive electrode composite material layer (such as positive electrode active material and binder) and a solvent. The positive electrode composite material layer is in close contact with the separator 130. The thickness of the positive electrode composite material 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 material layer. The negative electrode composite material layer is coated on a part of the negative electrode current collector. That is, the negative electrode current collector includes a coated portion where the negative electrode composite material layer is coated and an uncoated portion where the negative electrode composite material layer is not coated.

[0018] For the negative electrode current collector, for example, a copper foil or the like is used. The negative electrode composite material layer is formed by coating the negative electrode slurry on 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 composite material layer (such as negative electrode active material and binder) and a solvent. The negative electrode composite material layer is in close contact with the separator 130. The thickness of the negative electrode composite material 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 (Z1 side) in the axial direction Z.

[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 (Z2 side) in the axial direction Z.

[0021] The cell case 200 houses the wound electrode body 100. The cell case 200 has a substantially rectangular cylindrical outer shape. Therefore, the power storage cell 10 becomes a rectangular cylindrical battery.

[0022] 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.

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

[0024] The first end portion 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 portion 220 has a first hole portion 221 that penetrates in the axial direction Z.

[0025] The first end portion 220 specifically includes an outer cap 222, an insulating layer 223, and a crimped portion 224.

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

[0027] The insulating layer 223 is positioned to cover the outer edge of the outer cap 222. The insulating layer 223 is provided to insulate the outer cap 222 from the crimped portion 224.

[0028] The crimped 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 crimped portion 224 is integrally molded with the outer peripheral wall portion 210. The crimped 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 crimped portion 224 is made of copper or aluminum or the like.

[0029] 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 portion 230 has a second hole portion 231 that penetrates in the axial direction Z.

[0030] The second end portion 230 has a rectangular plate-like outer shape. The second end portion 230 is made of copper or aluminum, or the like. The periphery of the second end portion 230 is connected to the outer peripheral wall portion 210. The second end portion 230 is integrally molded 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 peripheral wall portion 210 connected to the second end 230, and the crimped portion 224 become 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 positioned on the inside of the wound electrode body 100 in the radial direction R. Of the inner circumferential wall portion 240, the portion that aligns with the wound electrode body 100 in the radial direction R has a rectangular cylindrical 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 cylindrical outer shape. The core portion 241 is located inside the wound electrode body 100 in the radial direction R. The core portion 241 may be used as a core material when winding the electrode plate group to form the wound electrode body 100. From the viewpoint of heat dissipation, the core portion 241 is preferably made of a metal such as copper or aluminum.

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

[0036] The second insulating end 243 is located 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 comprises 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 to insulate the wound electrode body 100 (negative electrode plate 120 and separator 130) from the cell case 200. The positive side insulating plate 300 is provided 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 through the first through hole 310 and is in contact with the conductive film 510, which will be described later. As a result, the positive electrode tab lead 140 and the conductive film 510 are electrically connected. The inner peripheral wall portion 240 (core portion 241) is inserted through the second through hole 320.

[0040] The negative side insulating plate 400 is housed in the cell case 200. The negative side insulating plate 400 is provided to insulate the wound electrode body 100 (positive electrode plate 110 and separator 130) from the cell case 200. The negative side insulating plate 400 is provided 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 electrode tab lead 150 is inserted through the through hole 410. This electrically connects the negative electrode tab lead 150 to the second end 230. The inner circumferential wall portion 240 (core portion 241 and second insulating end 243) is also inserted through the through hole 410.

[0042] The CID500 is an element that interrupts the current path by utilizing the increase in internal cell pressure caused by gas generated due to overcharging of the energy storage cell 10. The CID500 is provided to seal the opening on one side (Z1 side) of the outer peripheral wall portion 210. The CID500 has a conductive film 510, a gasket 520, and a bottom disk 530.

[0043] The conductive film 510 is provided to seal the 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 outer cap 222 by a connecting member (not shown). As a result, the outer cap 222 is also positively charged.

[0044] The conductive film 510, like the outer cap 222, is provided with a weak portion 511 (thin-walled portion). The conductive film 510 is prone to breaking starting from the weak portion 511 when the internal pressure of the cell case 200 increases. When the conductive film 510 breaks due to the increase in internal pressure, 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 eliminated, and the positive charge of the outer cap 222 is also eliminated. Consequently, charging and discharging of the energy storage cell 10 is stopped.

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

[0046] The core portion 241 and the first insulating end portion 242 of the inner circumferential wall portion 240 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, a battery storage module according to Embodiment 1 of this disclosure will be described. Figure 3 is a schematic cross-sectional view showing a battery storage module according to Embodiment 1 of this disclosure. Figure 4 is a perspective view showing a plurality of battery storage cells included in the battery storage module according to Embodiment 1 of this disclosure. Figure 5 is a partial cross-sectional view showing a part of the battery storage module according to Embodiment 1 of this disclosure. In Figure 3, a schematic cross-sectional view of the battery storage cell 10 is shown.

[0048] As shown in Figures 3 to 5, the energy storage module 1 according to Embodiment 1 of the present disclosure comprises one or more energy storage cells 10 and one or more cooling members 20.

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

[0050] For each energy storage cell 10, each of the multiple cooling members 20 is positioned 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 positioned to penetrate the energy storage cell 10 in the axial direction Z.

[0051] The cooling member 20 has a metal part 21, a first insulating coating part 22, and a second insulating coating part 23.

[0052] The metal portion 21 is made of a metal such as aluminum or copper. The metal portion 21 extends along the axial direction Z of the corresponding energy storage cell 10 from the inside of the first hole 221 to the inside of the second hole 231. The portion of the metal portion 21 that aligns radially 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 covers a portion of the outer surface of the metal portion 21 in the radial direction R. The first insulating coating portion 22 is in contact with the 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 covers another portion of the outer surface of the metal portion 21 in the radial direction R. The second insulating coating portion 23 is in contact with the 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 busbars 30 and a second busbar 40. The first busbar and / or the second busbar 40 electrically connect two or more energy storage cells 10.

[0056] One or more first busbars 30 are electrically connected to the first ends 220 of multiple energy storage cells 10. One or more second busbars 40 are electrically connected to the second ends 230 of multiple energy storage cells 10. If the energy storage module 1 includes multiple first busbars 30 and multiple second busbars 40, a first busbar 30 may be electrically connected to other first busbars 30. A second busbar 40 may be electrically connected to other second busbars 40. A first busbar 30 may be electrically connected to a second busbar 40 connected to an energy storage cell 10 to which that first busbar 30 is not connected.

[0057] The energy storage module 1 further comprises 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 part 21). The second heat transfer section 60 is connected to the other end of each cooling member 20 (metal part 21). The first heat transfer section 50 and the second heat transfer section 60 function to help dissipate the heat transferred from the energy storage cell 10 to each cooling member 20 (metal part 21) to the outside of the energy 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 energy storage module 1 may further include a first insulating plate 70 and a second insulating plate 80. The first insulating plate 70 is positioned between the first busbar 30 and the first heat transfer unit 50, electrically insulating them. The second insulating plate 80 is positioned between the second busbar 40 and the second heat transfer unit 60, electrically insulating them.

[0059] The energy storage module 1 further comprises a module case 90. The module case 90 houses a plurality of energy storage cells 10, a plurality of cooling members 20, a first busbar 30, a second busbar 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] The specific configuration of the module case 90 is not particularly limited. In the example shown in Figure 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 an upper case 92. In this case, the opening of the lower case 91 may be sealed by a first heat transfer section 50 or a first insulating plate 70.

[0061] As described above, the energy storage cell 10 according to Embodiment 1 of the present disclosure comprises a wound electrode body 100 and a 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 located on the outside of the wound electrode body 100 in the radial direction R. 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 that penetrates 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 portion 230 has a second hole portion 231 that penetrates in the axial direction Z. 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 located on the inside of the wound electrode body 100 in the radial direction R. Of the outer circumferential wall portion 210, the portion that aligns with the wound electrode body 100 in the radial direction R has a rectangular cylindrical outer shape. Of the inner circumferential wall portion 240, the portion that aligns with the wound electrode body 100 in the radial direction R has a rectangular cylindrical outer shape.

[0062] According to the above configuration, the portion of the outer peripheral wall 210 has a rectangular cylindrical shape, which allows multiple energy storage cells 10 to be densely arranged in the energy storage module 1 (see Figure 4). Because the energy storage cells 10 can be densely arranged, the space within the cell case 200 for each energy storage cell 10 can be made wider in the energy storage module 1. Therefore, the size of the wound electrode body 100 for each energy storage cell 10 can be increased in the energy storage module 1, and the overall capacity of the energy storage module 1 can be increased.

[0063] Furthermore, with the above configuration, the portion of the inner circumferential wall 240 has a rectangular cylindrical outer shape, which allows the wound electrode body 100 to easily conform to the shape of the outer circumferential wall 210. Also, the portion of the inner circumferential wall 240 has a rectangular cylindrical outer shape, which relatively increases the outer surface area of ​​the inner circumferential wall 240. Therefore, even when multiple energy storage cells 10 are densely arranged, heat dissipation from the inner circumferential wall 240 can be improved.

[0064] Therefore, a storage cell 10 having the above configuration can increase the capacity of the storage module 1 equipped with it, and can also improve the heat dissipation performance of the storage cell 10.

[0065] Furthermore, the energy storage module 1 according to Embodiment 1 of the present disclosure comprises one or more energy storage cells 10 and a cooling member 20. The cooling member 20 is located further inside the inner peripheral 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 along the axial direction Z of the corresponding energy storage cell 10 from the inside of the first hole portion 221 to the inside of the second hole portion 231. The portion of the metal portion 21 that aligns radially 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] With the above configuration, the heat emitted from the energy storage cell 10 is more easily released through the metal part 21. Therefore, the cooling efficiency of the energy storage cell 10 in the energy storage module 1 can be further improved.

[0067] (Embodiment 2) The following describes the energy storage module according to Embodiment 2 of this disclosure. The energy storage module according to Embodiment 2 of this disclosure differs from the energy storage module 1 according to Embodiment 1 of this disclosure mainly in the configuration of the cooling member. For this reason, the same configuration and effects as those of the energy storage module 1 according to Embodiment 1 of this disclosure will not be repeated in this description.

[0068] Figure 6 is a cross-sectional view showing an energy storage module according to Embodiment 2 of this disclosure. In Figure 6, the energy storage module according to Embodiment 2 is shown in a cross-sectional view similar to that of the energy storage module 1 of Embodiment 1 in Figure 3.

[0069] As shown in Figure 6, in the 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 the refrigerant C to flow through it in the axial direction (Z) within it.

[0070] According to the above configuration, by passing the refrigerant C through the cooling member 20a, the heat emitted from the energy storage cell 10 is more easily released through the cooling member 20a. Therefore, the cooling efficiency of the energy storage cell 10 in the energy storage module 1a can be further improved.

[0071] More specifically, in each cooling member 20a, the metal part 21a is configured to allow the refrigerant C to flow through it in the axial direction Z. Furthermore, the first heat transfer section 50a and the second heat transfer section 60a may be configured to accommodate the refrigerant C within them. The interiors of the first heat transfer section 50a and the second heat transfer section 60a and the interior of the cooling member 20a (metal part 21a) may be configured to allow the refrigerant C to move in and out of each other. The first heat transfer section 50a and the second heat transfer section 60a may further function as coolers for cooling the refrigerant C.

[0072] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0073] 1,1a Energy storage module, 10 Energy storage cell, 20,20a Cooling member, 21,21a Metal part, 22 First insulating coating part, 23 Second insulating coating part, 30 First busbar, 40 Second busbar, 50,50a First heat transfer part, 60,60a Second heat transfer part, 70 First insulating plate, 80 Second insulating plate, 90 Module case, 91 Lower case, 92 Upper case, 100 Winding 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 part, 220 First end part, 221 First hole part, 222 Outer cap, 223 Insulating layer, 224 Crimping part, 230 Second end part, 231 Second hole part, 240 Inner circumferential wall portion, 241 core portion, 242 first insulating end portion, 243 second insulating end portion, 300 positive insulating plate, 310 first through hole, 320 second through hole, 400 negative insulating plate, 410 through hole, 500 CID, 510 conductive film, 520 gasket, 530 bottom disc, C refrigerant.

Claims

1. One or more energy storage cells, Equipped with a cooling element, The aforementioned energy storage cell is A wound electrode body and The cell case includes the aforementioned wound electrode body, The aforementioned cell case is A cylindrical outer peripheral wall portion is positioned radially outward 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 and has a first hole portion that penetrates in the axial direction, A second end portion is connected to the other side of the outer peripheral wall portion in the axial direction and has a second hole portion that penetrates in the axial direction, It has an inner circumferential wall portion that extends from the first hole to the second hole and is located on the inside in the radial direction of the wound electrode body, Of the outer peripheral wall portion, the portion that aligns with the wound electrode body in the radial direction has a rectangular cylindrical shape. Of the inner circumferential wall portion, the portion adjacent to the wound electrode body in the radial direction has a rectangular cylindrical outer shape. The cooling member is positioned further inside the inner peripheral wall portion of the energy storage cell in the radial direction of the energy storage cell. The cooling member has a metal part made of metal, The metal portion extends along the axial direction of the corresponding energy storage cell from the inside of the first hole to the inside of the second hole, The metal portion, in which the portion aligned radially with the wound electrode body of the corresponding energy storage cell, constitutes at least a part of the outer surface of the cooling member and is in contact with the inner circumferential wall portion. The cooling member further comprises a first insulating coating portion and a second insulating coating portion. The first insulating coating portion covers a part of the outer surface of the metal portion in the radial direction, and is in contact with the first end of the corresponding energy storage cell. A storage module wherein the second insulating coating covers another portion of the radial outer surface of the metal portion and is in contact with the second end of the corresponding energy storage cell.

2. The energy storage module according to claim 1, wherein the cooling member is configured to allow a refrigerant to flow through it in the axial direction.

3. The inner circumferential wall portion has a core portion, a first insulating end portion, and a second insulating end portion. The core portion is made of metal, The first insulating end is positioned on one side of the core in the axial direction and insulates the core from the first end. The energy storage module according to claim 1 or claim 2, wherein the second insulating end is located on the other side of the core in the axial direction and insulates the core from the second end.

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