Energy storage module

Abstract

To efficiently cool a plurality of electrode bodies, each of which is accommodated in each compartment.SOLUTION: In a power storage module 1 based on the present disclosure, a case 200 includes a case body 210 and at least one partition portion 220. The case body 210 surrounds the plurality of electrode bodies 100. The partition portion 220 is located between the electrode bodies 100 adjacent to each other to partition an accommodation space S of the case body 210. In the accommodation space S of the case body 210, there are formed, by the partition portion 220, a first compartment S1, and a second compartment S2 adjacent to the first compartment S1 via the partition portion 220. In the case 200, there are formed a first cooling path 500 extending at the inside of a portion facing the first compartment S1 without going through the second compartment S2, and a second cooling path 600 extending at the inside of a portion facing the second compartment S2 without going through the first compartment S1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage module. [Background technology]

[0002] The battery case disclosed in Patent Document 1 (JP 2019-106372 A) has an accommodating section in which a lower wall and a plurality of (e.g., three, four, or more) side walls are integrated to form an internal space, has an open surface facing the lower wall, and is provided with one or more (e.g., two, three, four, five, or more) partition walls within the space. This results in the accommodating section including a plurality of battery compartments separated by one or more partition walls disposed within the space. Each battery compartment can accommodate an electrode assembly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-106372 Summary of the Invention [Problem to be solved by the invention]

[0004] In the battery case disclosed in Patent Document 1, heat generated from the electrode assembly in one compartment is easily transferred to another compartment via the partition wall.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and has an object to provide an electricity storage module that can efficiently cool a plurality of electrode assemblies housed in each compartment. [Means for solving the problem]

[0006] An energy storage module according to the present disclosure includes a plurality of electrode assemblies and a case. The plurality of electrode assemblies are aligned in a first direction. The case houses the plurality of electrode assemblies. The case has a case body and at least one partition wall. The case body surrounds the plurality of electrode assemblies. The partition wall is located between adjacent electrode assemblies and divides the housing space of the case body. In the housing space of the case body, a first compartment and a second compartment adjacent to the first compartment via the partition wall are formed by the partition wall. The case is formed with a first cooling path extending inside a portion facing the first compartment without passing through the second compartment, and a second cooling path extending inside a portion facing the second compartment without passing through the first compartment.

[0007] According to the above configuration, the plurality of electrode assemblies housed in each of the first and second compartments can be efficiently cooled by the first and second cooling paths. [Effects of the Invention]

[0008] According to the present disclosure, the plurality of electrode assemblies housed in each compartment can be efficiently cooled. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an electricity storage module according to a first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of a part of the electricity storage module according to the first embodiment. [Figure 3] 3 is a cross-sectional view of the energy storage module of FIG. 1, taken along the line III-III. [Figure 4] 4 is a cross-sectional view of the energy storage module of FIG. 1 as viewed in the direction of the arrows along line IV-IV. [Figure 5] 2 is a cross-sectional view of an electrode body in the electricity storage module of FIG. 1, as viewed in the direction of the arrows along line VV. [Figure 6] FIG. 10 is an exploded perspective view of a part of the electricity storage module according to the second embodiment. [Figure 7]7 is a cross-sectional view of the energy storage module of FIG. 6, seen in the direction of the arrows VII-VII. DETAILED DESCRIPTION OF THE INVENTION

[0010] Each embodiment of the present disclosure will be described with reference to the drawings, in which the same or corresponding components are designated by the same reference numerals.

[0011] (Embodiment 1) Fig. 1 is a perspective view showing an energy storage module according to embodiment 1. Fig. 2 is an exploded perspective view in which the energy storage module according to embodiment 1 is partially disassembled. Fig. 3 is a cross-sectional view of the energy storage module of Fig. 1 as seen in the direction of the arrows III-III. Fig. 4 is a cross-sectional view of the energy storage module of Fig. 1 as seen in the direction of the arrows IV-IV.

[0012] As shown in FIGS. 1 to 4, an energy storage module 1 according to a first embodiment of the present disclosure includes a plurality of electrode assemblies 100, a case 200, at least one connecting conductive member 310, and an external conductive member 320. The plurality of electrode assemblies 100 are aligned in a first direction D1. The case 200 houses the plurality of electrode assemblies 100. The connecting conductive member 310 is aligned with the plurality of electrode assemblies 100 in a second direction D2 and electrically connects adjacent plurality of electrode assemblies 100. The second direction D2 is perpendicular to the first direction D1.

[0013] In this embodiment, the multiple electrode assemblies 100 include a first electrode assembly 100A, a second electrode assembly 100B, and a third electrode assembly 100C. The third electrode assembly 100C is located opposite the second electrode assembly 100B when viewed from the first electrode assembly 100A. In this embodiment, the second electrode assembly 100B is located at the end of the multiple electrode assemblies 100 in the first direction D1. The third electrode assembly 100C is located at the end of the multiple electrode assemblies 100 on the opposite side to the second electrode assembly 100B in the first direction D1. The multiple electrode assemblies 100 may include four or more electrode assemblies.

[0014] Fig. 5 is a cross-sectional view of an electrode assembly in the energy storage module of Fig. 1, viewed in the direction of the VV arrows. As shown in Fig. 5, each of the multiple electrode assemblies 100 includes multiple electrodes 110, 120 and a separator 130. In this embodiment, the electrode assembly 100 is an electrode assembly for a secondary battery, such as a lithium-ion secondary battery.

[0015] 5, the plurality of electrodes 110, 120 are arranged to line up in a first direction D1. The plurality of electrodes 110, 120 includes a plurality of positive electrodes 110 and a plurality of negative electrodes 120.

[0016] Each positive electrode 110 is formed in a rectangular shape that is long in the second direction D2 (a direction perpendicular to the paper surface in FIG. 5). Each positive electrode 110 has a positive electrode current collector foil 112 and positive electrode active material layers 114 provided on both sides of the positive electrode current collector foil 112. The positive electrode current collector foil 112 has a positive electrode tab 112p (see FIGS. 3 and 4) on which the positive electrode active material layer 114 is not provided. The positive electrode tab 112p protrudes toward one side in the second direction D2.

[0017] Each negative electrode 120 is formed in a rectangular shape that is long in the second direction D2. Each negative electrode 120 has a negative electrode current collector foil 122 and negative electrode active material layers 124 provided on both sides of the negative electrode current collector foil 122. The negative electrode current collector foil 122 has a negative electrode tab 122n (see FIGS. 3 and 4) on which the negative electrode active material layer 124 is not provided. The negative electrode tab 122n protrudes toward the other side in the second direction D2.

[0018] The separator 130 provides insulation between the positive electrode 110 and the negative electrode 120. The separator 130 is made of an insulating material and has minute voids that allow ions to pass through. As shown in Figure 5, the separator 130 is formed in a zigzag shape.

[0019] The separator 130 has a rectangular shape before being folded in a zigzag shape. The separator 130 is disposed between the electrodes 110, 120 while being folded in a zigzag shape. The separator 130 has a plurality of intervening portions 132a, a plurality of upper folded portions 132b, a plurality of lower folded portions 132c, and an outermost covering portion 132d.

[0020] Each intervening portion 132a is interposed between a pair of electrodes 110, 120 adjacent to each other in one direction. In other words, each intervening portion 132a has the function of insulating between the positive electrode 110 and the negative electrode 120. Each intervening portion 132a is formed of a rectangular region.

[0021] Each upper folded portion 132b connects an upper end portion of one of the plurality of intervening portions 132a to an upper end portion of another intervening portion 132a adjacent to the one intervening portion 132a on one side in one direction of the plurality of intervening portions 132a. In this embodiment, the upper folded portion 132b is disposed above the positive electrode 110.

[0022] Each lower folded portion 132c connects the lower end of one of the plurality of intervening portions 132a to the lower end of another of the plurality of intervening portions 132a that is adjacent to the one intervening portion on the other side in one direction. In this embodiment, the lower folded portion 132c is disposed below the negative electrode 120. In other words, the negative electrode 120 is disposed on the lower folded portion 132c.

[0023] The outermost covering portion 132d collectively covers the upper folded portions 132b and the lower folded portions 132c. More specifically, the outermost covering portion 132d collectively covers all of the electrodes 110, 120, all of the intervening portions 132a, all of the upper folded portions 132b, and all of the lower folded portions 132c while being wound around a central axis parallel to the second direction D2. The end 132e of the outermost covering portion 132d is set in a range that does not overlap with the positive electrode active material layer 114 and the negative electrode active material layer 124 in one direction. In this embodiment, the end 132e of the outermost covering portion 132d is provided below the electrodes 110, 120. The peripheral surfaces and bottom surfaces of the multiple electrodes 110, 120 and the separator 130 may or may not be covered with an insulating film. The peripheral and bottom surfaces of the plurality of electrodes 110 and 120 and separator 130 may be in direct contact with the case 200 .

[0024] As shown in FIGS. 1 to 4, the case 200 has a case body 210 and at least one partition wall 220.

[0025] The case body 210 has electrical insulation properties at least on the surface facing the electrode body 100. The case body 210 surrounds the multiple electrode bodies 100.

[0026] The case body 210 has a bottom wall portion 211 , a peripheral side wall portion 212 , a hole portion 215 , a lid 216 , and a welded portion 217 .

[0027] The bottom wall portion 211 is made of a resin composition. In the case body 210, the bottom wall portion 211 is located on one side in the third direction D3. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2. The bottom wall portion 211 extends along the first direction D1 and the second direction D2. When viewed from the third direction D3, the bottom wall portion 211 has a rectangular outer shape.

[0028] The peripheral side wall portion 212 is made of a resin composition and is molded integrally with the bottom wall portion 211. The peripheral side wall portion 212 stands in the third direction D3 from the peripheral edge of the bottom wall portion 211 and forms an opening OP facing away from the bottom wall portion 211.

[0029] The peripheral side wall portion 212 has a pair of first wall portions 213 and a pair of second wall portions 214. The pair of first wall portions 213 are aligned in the first direction D1. The pair of first wall portions 213 extend along the second direction D2. The pair of second wall portions 214 are aligned in the second direction D2. The pair of second wall portions 214 extend along the first direction D1. Note that the pair of second wall portions 214 do not have to be molded integrally with the bottom wall portion 211 and the pair of first wall portions 213.

[0030] Hole 215 is provided to expose a portion of connecting conductive member 310 to the outside of case body 210. Hole 215 is closed by connecting conductive member 310. Specifically, hole 215 is provided in peripheral side wall 212, and more specifically, in second wall 214.

[0031] In this embodiment, the case body 210 has a plurality of holes 215 as the above-described holes 215. Of the plurality of holes 215, the external conductive member 320 is exposed from another hole 215 different from the hole 215 described above.

[0032] The opening OP is closed by the lid 216. In this embodiment, at least the portion of the lid 216 that faces the peripheral side wall portion 212 is made of a resin composition. The lid 216 has a flat plate-like or film-like outer shape.

[0033] The lid 216 may be a laminate including a resin layer made of the resin composition and a barrier layer. Specifically, the lid 216 may be a laminate film in which a barrier layer made of aluminum or the like is laminated onto a resin layer. The lid 216 may also be a plate-like member in which a metal plate made of aluminum or the like is laminated onto a resin layer. The barrier layer or the metal plate may be disposed inside the resin layer.

[0034] The welded portion 217 is formed by thermally welding the lid 216 and the peripheral side wall portion 212. Instead of forming the welded portion 217, the lid 216 and the peripheral side wall portion 212 may be joined to each other by another known joining method, such as using an adhesive.

[0035] In addition, when the pair of second wall portions 214 are not molded integrally with other parts as described above, the lid 216 may be molded integrally with the pair of second wall portions 214 and the partition portion 220 described below.

[0036] The partition wall portions 220 are electrically insulating at least on the surface facing the electrode body 100. The partition wall portions 220 are located between adjacent electrode bodies 100 to partition the storage space S of the case body 210. The case 200 according to this embodiment has multiple partition wall portions 220. The multiple partition wall portions 220 include a first partition wall portion 220A and a second partition wall portion 220B. The multiple partition wall portions 220 may include three or more partition wall portions.

[0037] In the storage space S of the case body 210, a partition wall 220 (first partition wall 220A) defines a first compartment S1 and a second compartment S2 adjacent to the first compartment S1 via the partition wall 220 (first partition wall 220A). In addition, in the storage space S, a second partition wall 220B defines a third compartment S3 adjacent to the first compartment S1 via the first compartment S1 and the second partition wall 220B. The third compartment S3 is located opposite the second compartment S2 when viewed from the first compartment S1.

[0038] The case 200 is further formed with a plurality of first cooling paths 500, a plurality of second cooling paths 600, and a plurality of third cooling paths 700. These cooling paths are configured to allow a refrigerant to flow therethrough. The refrigerant may be a liquid or a gas such as air. A system including the power storage module 1 according to this embodiment may further include a cooler. The cooler may cool the refrigerant flowing through these cooling paths. The above system may be a battery cooling system provided in a vehicle.

[0039] Each of the multiple first cooling paths 500 extends within a portion facing the first section S1 without passing through the second section S2. Specifically, this portion is a portion facing the first section S1 without passing through any sections other than the first section S1 (the second section S2 and the third section S3). Each first cooling path 500 extends along the second direction D2. Each first cooling path 500 extends from one side to the other side of the case 200. Each first cooling path 500 is a through hole. Each first cooling path 500 has an opening on each of the one side and the other side of the case 200.

[0040] In this embodiment, the first cooling path 500 is specifically provided in the case body 210. The first cooling path 500 is aligned with the first section S1 in the third direction D3. More specifically, the first cooling path 500 is located inside the bottom wall portion 211 in the first direction D1 and the third direction D3. The first cooling path 500 has openings on both sides of the bottom wall portion 211 in the second direction D2.

[0041] Each of the multiple second cooling paths 600 extends within a portion facing the second section S2 without passing through the first section S1. Specifically, this portion is a portion facing the second section S2 without passing through any sections other than the second section S2 (the first section S1 and the third section S3). Each second cooling path 600 extends along the second direction D2. Each second cooling path 600 extends from one side to the other side of the case 200. Each second cooling path 600 is a through hole. Each second cooling path 600 has an opening on each of the one side and the other side of the case 200.

[0042] In this embodiment, the second cooling path 600 is specifically provided in the case body 210. The second cooling path 600 is aligned with the second section S2 in the third direction D3. More specifically, the second cooling path 600 is located inside the bottom wall portion 211 in the first direction D1 and the third direction D3. The second cooling path 600 has openings on both sides of the bottom wall portion 211 in the second direction D2.

[0043] The third cooling path 700 extends within the portion facing the third section S3 without passing through any sections other than the third section S3 (the first section S1 and the second section S2). In this embodiment, the third cooling path 700 is aligned with the third section S3 in the third direction D3. Except for these configurations, the third cooling path 700 may have the same configuration as the first cooling path 500 or the second cooling path 600.

[0044] Of the multiple electrode assemblies 100, the first electrode assembly 100A is housed in the first compartment S1. The second electrode assembly 100B is housed in the second compartment S2. The third electrode assembly 100C is housed in the third compartment. An electrolyte solution is poured into the housing space S (first compartment S1, second compartment S2, third compartment S3). Note that the electrolyte solution is not shown. The method for pouring the electrolyte solution is not particularly limited. The electrolyte solution may be poured through the opening OP before the opening OP is closed by the lid 216.

[0045] The plurality of partition walls 220 are made of a resin composition and are integrally molded with the bottom wall 211 and the peripheral side wall 212. In this embodiment, the plurality of partition walls 220 and the lid 216 may or may not be joined to each other by thermal welding.

[0046] In this embodiment, the above-mentioned "integrally molded" method may include a method in which each component is molded and joined simultaneously in one step by a known method such as injection molding, or a method in which multiple components are molded separately and then joined together by a known joining method such as welding, adhesion, or the like.

[0047] Here, a resin composition that can form the bottom wall portion 211, the peripheral side wall portion 212, the lid 216, and the plurality of partition portions 220 in this embodiment will be described.

[0048] The resin composition may contain, as a base polymer, polycarbonate, polyethylene, polypropylene, polyvinyl, polyamide, polyester, polyphenylene sulfide (PPS), polyphenylene ether, polystyrene, polycyclic olefin copolymer, acrylonitrile-butadiene-styrene copolymer, liquid crystal polymer (LCP), fluorine-based resin, a mixture thereof, an alloy thereof, or a copolymer thereof, but the base polymer is not limited to these.

[0049] The resin composition may contain polyolefin, liquid crystal polymer, or fluororesin as a base polymer. The polyolefin may contain high density polyethylene (HDPE). High density polyethylene, liquid crystal polymer, or fluororesin has a relatively low water vapor permeability. Therefore, case 200 containing a resin composition containing these has improved moisture permeability resistance.

[0050] The liquid crystal polymer may contain structural units derived from an oligomer of hydroxybenzoic acid. The liquid crystal polymer may further contain, in addition to the oligomer of hydroxybenzoic acid, two or more selected from the group consisting of 2,6-hydroxynaphthoic acid (HNA), terephthalic acid (TPA), isophthalic acid (IPA), hydroquinone (HQ), biphenol (BP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), copolymerized with the oligomer of hydroxybenzoic acid (HBA).

[0051] Examples of fluororesins include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), and mixtures or copolymers thereof. Fluororesins are hydrophobic. Therefore, based on the total weight of the resin composition, the resin composition may contain, for example, about 20 wt % or less, about 15 wt % or less, about 10 wt % or less, about 3 wt % to about 10 wt %, or about 5 wt % to about 10 wt % of the fluororesin. When the content of the fluororesin is within the above range, a molded article made from the resin composition is considered to have the effect of blocking moisture from the surface of the molded article that comes into contact with the outside air.

[0052] In this embodiment, it is preferable that the base polymer of the resin composition constituting the lid 216 and the base polymer of the resin composition constituting the peripheral side wall portion 212 and the plurality of partitions 220 are the same. This allows these components to be easily welded to each other. This in turn makes it easy to form the welded portion 217. From the viewpoint of performing thermal welding, it is also preferable that the base polymer be polyethylene or polypropylene.

[0053] The resin composition may further contain an inorganic moisture absorbent or graphite from the viewpoint of suppressing water vapor transmission rate. In addition, the resin composition may further contain a substance other than graphite that is known as an existing moisture barrier substance.

[0054] The bottom wall 211, the peripheral side wall 212, the lid 216, and the partitions 220 may be made of metal. In this case, it is preferable that the portions facing the storage space S are covered with an insulating material. In this case, it is also preferable that an insulating member be disposed between the peripheral side wall 212 and the connecting conductive member 310 and the external conductive member 320.

[0055] Next, the connecting conductive members 310 and the external conductive members 320 will be described. In this embodiment, the energy storage module 1 includes a plurality of connecting conductive members 310. The plurality of connecting conductive members 310 include a first connecting conductive member 310A and a second connecting conductive member 310B. The plurality of connecting conductive members 310 may include three or more connecting conductive members. Furthermore, in this embodiment, the energy storage module 1 includes a first external conductive member 320A and a second external conductive member 320B as the external conductive member 320.

[0056] The connecting conductive member 310 (first connecting conductive member 310A, second connecting conductive member 310B) has a first end portion 311A, a second end portion 311B, a first inner surface portion 312A, a second inner surface portion 312B, a first outer surface portion 313A, and a second outer surface portion 313B.

[0057] In the first connection conductive member 310A, the first end portion 311A ​​is an end portion on one side of the first connection conductive member 310A in the first direction D1, and is embedded in the peripheral side wall portion 212 (one of the second wall portions 214) of the case body 210. The second end portion 311B is an end portion on the other side of the first connection conductive member 310A in the first direction D1, and is embedded in the peripheral side wall portion 212 (one of the second wall portions 214) of the case body 210.

[0058] In the first connecting conductive member 310A, the first inner surface portion 312A is exposed to the first section S1 and is electrically connected to the electrode tab (negative electrode tab 122n) of the first electrode body 100A. The second inner surface portion 312B is exposed to the second section S2 and is electrically connected to the electrode tab (positive electrode tab 112p) of the second electrode body 100B.

[0059] In the second connection conductive member 310B, the first end 311A ​​is an end on one side of the second connection conductive member 310B in the first direction D1 and is embedded in the circumferential side wall 212 (the other second wall 214) of the case body 210. The second end 311B is an end on the other side of the second connection conductive member 310B in the first direction D1 and is embedded in the circumferential side wall 212 (the other second wall 214) of the case body 210.

[0060] In the second connecting conductive member 310B, the first inner surface portion 312A is exposed to the first section S1 and is electrically connected to the electrode tab (positive electrode tab 112p) of the first electrode body 100A. The second inner surface portion 312B is exposed to the third section S3 and is electrically connected to the electrode tab (negative electrode tab 122n) of the third electrode body 100C.

[0061] In each connecting conductive member 310, first outer surface portion 313A is located on the opposite side to first inner surface portion 312A and is exposed to the outside of case body 210 through hole 215. Each connecting conductive member 310 is provided with a pressure release valve 314 that can release pressure on the first inner surface portion 312A side to the first outer surface portion 313A side.

[0062] In each connecting conductive member 310, the second outer surface portion 313B is located on the opposite side of the second inner surface portion 312B and is exposed to the outside of the case body 210 through another hole 215. Each connecting conductive member 310 is provided with another pressure release valve 315 that can release pressure on the second inner surface portion 312B side to the first outer surface portion 313A side.

[0063] The first external conductive member 320A is aligned with the third electrode body 100C in the second direction D2 and is electrically connected to the third electrode body 100C. The second external conductive member 320B is aligned with the second electrode body 100B in the second direction D2 and is electrically connected to the second electrode body 100B.

[0064] Each external conductive member 320 has a third inner surface portion 321 , an external connection surface portion 322 , and a buried end portion 323 .

[0065] In the first external conductive member 320A, the third inner surface portion 321 is exposed to the accommodation space S (third section S3) and is electrically connected to the electrode tab (positive electrode tab 112p) of the third electrode body 100C. In the second external conductive member 320B, the third inner surface portion 321 is exposed to the accommodation space S (second section S2) and is electrically connected to the electrode tab (negative electrode tab 122n) of the second electrode body 100B.

[0066] In each external conductive member 320, the external connection surface portion 322 is exposed to the outside of the case body 210 in the first direction D1. The buried end portion 323 is an end portion opposite to the external connection surface portion 322 side in the first direction D1, and is buried in the case body 210.

[0067] Each external conductive member 320 further has a third outer surface portion 324. The third outer surface portion 324 is located opposite the third inner surface portion 321. The third outer surface portion 324 is exposed to the outside of the case body 210 through one of the plurality of holes 215. Each external conductive member 320 is provided with a further pressure release valve 325 that can release pressure on the third inner surface portion 321 side to the third outer surface portion 324 side.

[0068] Each connecting conductive member 310 and each external conductive member 320 is made of a metal such as stainless steel, aluminum, or copper.

[0069] In this embodiment, the energy storage module 1 further includes a plurality of current collecting members 400. The plurality of current collecting members 400 are respectively arranged between the positive electrode tab 112p of each electrode assembly 100 and the connecting conductive member 310 or the external conductive member 320, and between the negative electrode tab 122n of each electrode assembly 100 and the connecting conductive member 310 or the external conductive member 320. Each current collecting member 400 is joined to its respective positive electrode tab 112p or negative electrode tab 122n by welding. Each current collecting member 400 is joined to the adjacent first inner surface portion 312A, second inner surface portion 312B, or third inner surface portion 321 by welding.

[0070] The multiple current collecting members 400 may include a metal material such as aluminum or copper. The power storage module 1 does not necessarily include a current collecting member 400. If the power storage module 1 does not include a current collecting member 400, each positive electrode tab 112p and each negative electrode tab 122n may be directly joined to the adjacent first inner surface portion 312A, second inner surface portion 312B, or third inner surface portion 321 by welding.

[0071] As described above, the energy storage module 1 according to the first embodiment of the present disclosure includes a plurality of electrode assemblies 100 and a case 200. The plurality of electrode assemblies 100 are arranged in a first direction D1. The case 200 houses the plurality of electrode assemblies 100. The case 200 has a case body 210 and at least one partition wall 220. The case body 210 surrounds the plurality of electrode assemblies 100. The partition wall 220 is located between adjacent pairs of electrode assemblies 100 to define an accommodation space S of the case body 210. In the accommodation space S of the case body 210, the partition wall 220 defines a first compartment S1 and a second compartment S2 adjacent to the first compartment S1 via the partition wall 220. The case 200 is formed with a first cooling path 500 extending inside the portion facing the first section S1 without passing through the second section S2, and a second cooling path 600 extending inside the portion facing the second section S2 without passing through the first section S1.

[0072] According to the above configuration, the plurality of electrode assemblies 100 housed in the first compartment S1 and the second compartment S2 can be efficiently cooled by the first cooling path 500 and the second cooling path 600. Furthermore, since the first cooling path 500 and the second cooling path 600 are formed inside the case 200, the number of parts of the energy storage module 1 can be reduced.

[0073] In this embodiment, the first cooling path 500 and the second cooling path 600 are provided in the case body 210. In this way, by providing the first cooling path 500 and the second cooling path 600 in the case body 210, which is relatively close to the external space of the case 200, it becomes relatively easy to manage the state of each cooling path.

[0074] (Embodiment 2) Hereinafter, a description will be given of an electric storage module according to a second embodiment of the present disclosure. In the electric storage module according to the second embodiment of the present disclosure, the portions where the cooling paths are formed differ from those of the electric storage module according to the first embodiment of the present disclosure. Therefore, the description of the configuration and effects of the electric storage module according to the second embodiment of the present disclosure that are similar to those of the first embodiment will not be repeated.

[0075] Fig. 6 is a partially exploded perspective view of the energy storage module according to embodiment 2. Fig. 7 is a cross-sectional view of the energy storage module of Fig. 6 as viewed in the direction of the arrows VII-VII.

[0076] As shown in Figures 6 and 7, in the energy storage module 1a according to the second embodiment of the present disclosure, the first cooling path 500a and the second cooling path 600a are integrally formed inside the partition wall portion 220 (first partition wall portion 220A) that separates the first compartment S1 and the second compartment S2.

[0077] With the above configuration, even if either the first electrode body 100A housed in the first compartment S1 or the second electrode body 100B housed in the second compartment S2 generates excessive heat, the cooling path formed in the partition portion 220 can further prevent the heat from the excessive heat from being transferred to the other electrode body.

[0078] Specifically, one cooling path formed inside the first partition wall portion 220A functions as both the first cooling path 500a and the second cooling path 600a. For convenience, this one cooling path will be described below as the second cooling path 600a.

[0079] In this embodiment, the second cooling path 600a is aligned with the second section S2 and the first section S1 in the first direction D1. Specifically, the second cooling path 600a is located inside the first partition wall portion 220A in the first direction D1 and the third direction D3. The second cooling path 600a has openings on both sides of the first partition wall portion 220A in the second direction D2. A plurality of first holes 218a are formed in the pair of second walls 214a to correspond to these openings. Each of these first holes 218a connects the second cooling path 600a to the external space of the case 200.

[0080] Furthermore, the first cooling path 500a is also formed inside the second partition wall portion 220B. Specifically, the first cooling path 500a and the third cooling path 700a are integrally formed inside the second partition wall portion 220B.

[0081] Specifically, one cooling path formed inside the second partition wall portion 220B functions as both the first cooling path 500a and the third cooling path 700a. For convenience, this one cooling path will be described below as the third cooling path 700a.

[0082] In this embodiment, the third cooling path 700a is aligned with the third section S3 and the first section S1 in the first direction D1. Specifically, the third cooling path 700a is located inside the second partition wall portion 220B in the first direction D1 and the third direction D3. The third cooling path 700a has openings on one side and the other side of the second partition wall portion 220B in the second direction D2. A plurality of second holes 219a corresponding to these openings are formed in the pair of second wall portions 214a. Each of these second holes 219a connects the third cooling path 700a to the external space of the case 200.

[0083] The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0084] 1, 1a Energy storage module, 100 Electrode body, 100A First electrode body, 100B Second electrode body, 100C Third electrode body, 110 Positive electrode, 112 Positive current collector foil, 112p Positive electrode tab, 114 Positive electrode active material layer, 120 Negative electrode, 122 Negative current collector foil, 122n Negative electrode tab, 124 Negative electrode active material layer, 130 Separator, 132a Interposition portion, 132b Upper folded portion, 132c Lower folded portion, 132d Outermost coating portion, 132e End, 200 Case, 210 Case body, 211 Bottom wall portion, 212 Peripheral side wall portion, 213 First wall portion, 214, 214a Second wall portion, 215 Hole portion, 216 Lid, 217 Welding portion, 218a, first hole portion, 219a, second hole portion, 220, partition portion, 220A, first partition portion, 220B, second partition portion, 310, connecting conductive member, 310A, first connecting conductive member, 310B, second connecting conductive member, 311A, first end portion, 311B, second end portion, 312A, first inner surface portion, 312B, second inner surface portion, 313A, first outer surface portion, 313B, second outer surface portion, 314, 315, 325, pressure release valve, 320, external conductive member, 320A, first outer conductive member, 320B, second outer conductive member, 321, third inner surface portion, 322, external connection surface portion, 323, buried end portion, 324, third outer surface portion, 400, current collecting member, 500, 500a, first cooling path, 600, 600a Second cooling passage, 700, 700a third cooling passage, OP opening, S storage space, S1 first compartment, S2 second compartment, S3 third compartment.

Claims

1. A plurality of electrode bodies arranged in a first direction; a case that houses the plurality of electrode bodies; The case is a case body surrounding the plurality of electrode bodies; at least one partition wall portion positioned between the plurality of electrode bodies adjacent to each other to divide the storage space of the case body; a first compartment and a second compartment adjacent to the first compartment via the partition wall portion are formed in the storage space of the case body by the partition wall portion, the case is formed with a first cooling path extending inside a portion facing the first compartment without passing through the second compartment, and a second cooling path extending inside a portion facing the second compartment without passing through the first compartment, the first cooling path and the second cooling path are provided in the case main body, The first cooling path extends along a second direction perpendicular to the first direction, The second cooling path extends along the second direction, The case body has a bottom wall portion and a peripheral side wall portion, In the case main body, the bottom wall portion is located on one side in a third direction perpendicular to both the first direction and the second direction, the peripheral side wall portion is made of a resin composition and is integrally molded with the bottom wall portion, the peripheral side wall portion rises in the third direction from a peripheral end of the bottom wall portion and forms an opening facing away from the bottom wall portion, the partition wall portion is made of the resin composition and is integrally molded with the bottom wall portion and the peripheral side wall portion, the first cooling passage is aligned with the first section in the third direction; the first cooling passage has an opening on each of one side and the other side of the bottom wall portion in the second direction, the second cooling passage is aligned with the second section in the third direction; The second cooling passage has an opening on each of one side and the other side of the bottom wall portion in the second direction.

2. Further comprising a connecting conductive member, The connecting conductive member is a first end portion that is an end portion on one side in the first direction and is embedded in the peripheral side wall portion; a second end portion that is an end portion on the other side in the first direction and is embedded in the peripheral side wall portion; a first inner surface portion exposed to the first compartment and electrically connected to an electrode body of the plurality of electrode bodies housed in the first compartment; 2. The energy storage module according to claim 1, further comprising: a second inner surface portion exposed to the second compartment and electrically connected to an electrode body of the plurality of electrode bodies housed in the second compartment.

3. The case body further includes a plurality of holes provided in the peripheral wall portion to expose a portion of the connecting conductive member to the outside of the case body; The connecting conductive member is a first outer surface portion located on the opposite side of the first inner surface portion and exposed to the outside of the case body through one of the plurality of holes; a pressure release valve configured to release pressure on the first inner surface portion side to the first outer surface portion side; a second outer surface portion located on the opposite side of the second inner surface portion and exposed to the outside of the case body through another one of the plurality of holes; The energy storage module according to claim 2 , further comprising: another pressure release valve capable of releasing pressure on the second inner surface side to the second outer surface side.

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