Power storage module

Abstract

To provide a power storage module capable of preventing heat generated from an electrode body disposed on one side in a partitioned accommodation space from being transmitted to the other side in the accommodation space through a partition portion.SOLUTION: In a power storage module 1 based on the present disclosure, a case 200 accommodates a plurality of electrode bodies 100 therein. The 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. The partition portion 220 includes a pair of resin layers 220R and a metal layer 220M. The pair of resin layers 220R is formed integrally with the case body 210 and the resin layers are arranged in a first direction D1. The metal layer 220M is located between the pair of resin layers 220R and extends in a direction orthogonal to the first direction D1.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] The storage section of the battery case disclosed in Patent Document 1 (JP 2019-106372 A) has a lower wall and a plurality of (e.g., three, four, or more) side walls integrated together to form a space therein, 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. As a result, the storage section includes 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] JP 2019-106372 A 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 aims to provide an energy storage module that can prevent heat generated from an electrode body arranged on one side of a partitioned storage space from being transmitted to the other side of the storage space through a partition portion. [Means for solving the problem]

[0006] The energy storage module according to the present disclosure includes a plurality of electrode bodies and a case. The plurality of electrode bodies are aligned in a first direction. The case houses the plurality of electrode bodies. The case has a case body and at least one partition wall. The case body surrounds the plurality of electrode bodies. The partition wall is located between the plurality of adjacent electrode bodies to partition an accommodation space of the case body. The partition wall has a pair of resin layers and a metal layer. The pair of resin layers are molded integrally with the case body and aligned in the first direction. The metal layer is disposed between the pair of resin layers and extends in a direction perpendicular to the first direction.

[0007] According to the above configuration, the metal layer can prevent heat generated from the electrode body arranged on one side of the partitioned storage space from being transmitted to the other side of the storage space through the partition wall. When the heat is transmitted to the metal layer, the heat is diffused in a direction perpendicular to the first direction, and as a result, the heat is easily discharged to the outside of the case body. Effect of the Invention

[0008] According to the present disclosure, heat generated from an electrode body arranged on one side of a partitioned storage space can be prevented from being transmitted to the other side of the storage space via the partition. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view illustrating an electricity storage module according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of a part of the power storage module according to the embodiment; [Diagram 3] 3 is a cross-sectional view of the electricity storage module of FIG. 1, taken along the line III-III. [Figure 4] 4 is a cross-sectional view of the electricity storage module of FIG. 1 as viewed in the direction of the arrows IV-IV. [Diagram 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 VV line arrow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

[0012] As shown in FIGS. 1 to 4, an energy storage module 1 according to an embodiment of the present disclosure includes a plurality of electrode bodies 100, a case 200, at least one connecting conductive member 310, and an external conductive member 320. The plurality of electrode bodies 100 are arranged in a first direction D1. The case 200 accommodates the plurality of electrode bodies 100. The connecting conductive member 310 is arranged in a third direction D3 and electrically connects the plurality of electrode bodies 100 adjacent to each other. Note that a second direction D2 described later is a direction perpendicular to the first direction D1, and a third direction D3 is a direction perpendicular to both the first direction D1 and the second direction D2.

[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 as 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 body in the power storage module of Fig. 1, viewed in the direction of the VV line arrows. As shown in Fig. 5, each of the multiple electrode bodies 100 includes multiple electrodes 110, 120 and a separator 130. In this embodiment, the electrode body 100 is an electrode body for a secondary battery, such as a lithium ion secondary battery.

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

[0016] Each positive electrode 110 is formed in a rectangular shape that is long in the third direction D3 (a direction perpendicular to the paper surface in FIG. 5). Each positive electrode 110 has a positive electrode current collector foil 112 and a positive electrode active material layer 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 third direction D3.

[0017] Each negative electrode 120 is formed in a rectangular shape that is long in the third direction D3. Each negative electrode 120 has a negative electrode current collector foil 122 and a negative electrode active material layer 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 third direction D3.

[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 Fig. 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 interposed portions 132a, a plurality of upper folded portions 132b, a plurality of lower folded portions 132c, and an outermost covering portion 132d.

[0020] Each interposed portion 132a is interposed between a pair of electrodes 110, 120 adjacent to each other in one direction. That is, each interposed portion 132a has a function of insulating between the positive electrode 110 and the negative electrode 120. Each interposed 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 intermediate portions 132a to an upper end portion of the intermediate portion 132a adjacent to the one intermediate portion 132a on one side in one direction among the plurality of intermediate portions 132a. In this embodiment, the upper folded portion 132b is disposed above the positive electrode 110.

[0022] Each lower folded portion 132c connects a lower end of one of the plurality of intermediate portions 132a to a lower end of another intermediate portion 132a adjacent to the one intermediate portion on the other side in one direction among the plurality of intermediate portions 132a. 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 covers each of the upper folded portions 132b and each of the lower folded portions 132c collectively. More specifically, the outermost covering portion 132d 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 collectively while being wound around a central axis parallel to the third direction D3. 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 each of 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 multiple electrodes 110 , 120 and the 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 portion 220.

[0025] The case body 210 surrounds the multiple electrode bodies 100. The case body 210 has a resin body portion 210R, multiple metal portions 210M, and a lid 210C.

[0026] The resin body portion 210R is made of a resin composition and has a bottom wall portion 211, a peripheral side wall portion 212, and a hole portion 215.

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

[0028] The peripheral side wall portion 212 is molded integrally with the bottom wall portion 211. The peripheral side wall portion 212 stands in the second direction D2 from the peripheral end of the bottom wall portion 211. The peripheral side wall portion 212 forms an opening OP facing the side opposite to the bottom wall portion 211 side.

[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 third direction D3. The pair of second wall portions 214 are aligned in the third direction D3. The pair of second wall portions 214 extend along the first direction D1.

[0030] The hole 215 is provided to expose a part of the connection conductive member 310 to the outside of the case body 210 (the resin body portion 210R). The hole 215 is closed by the connection conductive member 310. Specifically, the hole 215 is provided in the peripheral side wall portion 212, and more specifically, in the second wall portion 214.

[0031] In the present embodiment, the resin main body 210R has a plurality of holes 215 as the above-described hole 215. From one of the plurality of holes 215, which is different from the hole 215 described above, the external conductive member 320 is exposed.

[0032] The metal part 210M is disposed inside the resin main body part 210R. The details of the metal part 210M will be described later.

[0033] The lid 210C closes the opening OP. In this embodiment, at least the portion of the lid 210C that faces the peripheral side wall portion 212 is made of a resin composition. The lid 210C has a flat plate-like or film-like outer shape.

[0034] The lid 210C may be a laminate including a lid resin layer made of the resin composition and a barrier layer. Specifically, the lid 210C may be a laminate film in which a barrier layer made of aluminum or the like is laminated to a lid resin layer. The lid 210C may be a plate-like member in which a metal plate such as aluminum is laminated to a lid resin layer. The barrier layer or the metal plate may be disposed inside the lid resin layer.

[0035] The lid 210C and the peripheral side wall portion 212 are thermally welded to each other, thereby forming a welded portion 217 in the case body 210. Instead of forming the welded portion 217, the lid 210C and the peripheral side wall portion 212 may be joined to each other by another known joining method such as an adhesive.

[0036] 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 a plurality of partition wall portions 220. The plurality of partition wall portions 220 include a first partition wall portion 220A and a second partition wall portion 220B. The plurality of partition wall portions 220 may include three or more partition wall portions.

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

[0038] Of the multiple electrode bodies 100, the first electrode body 100A is housed in the first compartment S1. The second electrode body 100B is housed in the second compartment S2. The third electrode body 100C is housed in the third compartment. An electrolyte is injected into the housing space S (first compartment S1, second compartment S2, third compartment S3). Note that the electrolyte is not shown. The method of injecting the electrolyte is not particularly limited. The electrolyte may be injected from the opening OP before the opening OP is closed by the lid 210C.

[0039] Each of the partition walls 220 has a pair of resin layers 220R and a metal layer 220M (see FIG. 4). The pair of resin layers 220R are arranged in the first direction D1. The pair of resin layers 220R are made of a resin composition. The pair of resin layers 220R are molded integrally with the case body 210. Specifically, the pair of resin layers 220R are molded integrally with the resin body portion 210R. More specifically, each of the pair of resin layers 220R is molded integrally with both the bottom wall portion 211 and the pair of second wall portions 214 in the peripheral side wall portion 212.

[0040] In this embodiment, the above-mentioned method of "integrally molding" 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 to each other by a known joining method such as fusing, welding, or adhesive.

[0041] The partitions 220 and the lid 210C may or may not be joined to each other by thermal welding.

[0042] Here, a resin composition that can form the resin body portion 210R, the lid resin layer of the lid 210C, and the resin layer 220R of the partition portion 220 in this embodiment will be described.

[0043] 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, mixtures thereof, alloys thereof, or copolymers thereof. The base polymer is not limited to these.

[0044] 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 transmission rate. Therefore, the case 200 including the resin body 210R containing these has improved moisture transmission resistance.

[0045] The liquid crystal polymer may contain structural units derived from an oligomer of hydroxybenzoic acid. The liquid crystal polymer may further contain two or more selected from the group consisting of HNA (2,6-hydroxynaphthoic acid), TPA (terephthalic acid), IPA (isophthalic acid), HQ (hydroquinone), BP (biphenol), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate) in addition to the oligomer of hydroxybenzoic acid, and may be copolymerized with the oligomer of hydroxybenzoic acid (HBA).

[0046] Examples of the fluororesin include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), or mixtures or copolymers thereof. The fluororesin is hydrophobic. Therefore, based on the total weight of the resin composition, the resin composition may contain, for example, about 20% by weight or less, about 15% by weight or less, about 10% by weight or less, about 3% by weight to about 10% by weight, or about 5% by weight to about 10% by weight of the fluororesin. When the content of the fluororesin is within the above range, it is considered that the molded article made of the resin composition has an effect of blocking moisture from the surface of the molded article that comes into contact with the outside air.

[0047] In this embodiment, it is preferable that the base polymer of the resin composition constituting the lid 210C is the same as the base polymer of the resin composition constituting the resin body portion 210R and each pair of resin layers 220R of the plurality of partition portions 220. This allows these components to be easily welded to each other. In turn, it is possible to easily form the welded portion 217. From the viewpoint of performing thermal welding, it is also preferable that the base polymer is polyethylene or polypropylene.

[0048] 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.

[0049] The metal layer 220M in the partition portion 220 is disposed between a pair of resin layers 220R. The metal layer 220M extends in a direction perpendicular to the first direction D1. Specifically, the metal layer 220M extends in both the second direction D2 and the third direction D3.

[0050] Here, the multiple metal parts 210M disposed inside the resin main body part 210R will be described in detail. Each of the multiple metal parts 210M is continuous with the metal layer 220M of the partition part 220 (see Figs. 1 and 2, etc.). Each of the multiple metal parts 210M is exposed to the external space of the case main body 210. The metal parts 210M and the metal layer 220M are made of a metal such as stainless steel, aluminum, or copper.

[0051] The multiple metal portions 210M include a bottom exposed portion 218 and a pair of side exposed portions 219. The bottom exposed portion 218 is disposed inside the bottom wall portion 211. The bottom exposed portion 218 is exposed from the bottom wall portion 211.

[0052] The pair of side exposed portions 219 are disposed inside the peripheral side wall portion 212. The pair of side exposed portions 219 are exposed from the peripheral side wall portion 212. Specifically, the pair of side exposed portions 219 are disposed inside the pair of second wall portions 214, respectively. The pair of side exposed portions 219 are exposed from the pair of second wall portions 214, respectively.

[0053] 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, as the external conductive member 320, a first external conductive member 320A and a second external conductive member 320B.

[0054] 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.

[0055] In the first connection conductive member 310A, the first end 311A ​​is an end on one side of the first connection conductive member 310A in the first direction D1 and is embedded in the circumferential side wall 212 (one of the second wall portions 214) of the resin main body portion 210R. The second end 311B is an end on the other side of the first connection conductive member 310A in the first direction D1 and is embedded in the circumferential side wall 212 (one of the second wall portions 214) of the resin main body portion 210R.

[0056] 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.

[0057] 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 resin body portion 210R. 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 resin body portion 210R.

[0058] In the second connection 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.

[0059] In each connecting conductive member 310, the first outer surface portion 313A is located on the opposite side to the first inner surface portion 312A, and is exposed to the outside of the case body 210 through the hole portion 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.

[0060] In each connecting conductive member 310, the second outer surface portion 313B is located on the opposite side to the second inner surface portion 312B and is exposed to the outside of the case body 210 from another hole portion 215. Each connecting conductive member 310 is provided with another pressure release valve 315 capable of releasing pressure on the second inner surface portion 312B side to the first outer surface portion 313A side.

[0061] The first external conductive member 320A is aligned with the third electrode body 100C in the third direction D3 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 third direction D3 and is electrically connected to the second electrode body 100B.

[0062] Each external conductive member 320 has a third inner surface portion 321 , an external connection surface portion 322 , and a buried end portion 323 .

[0063] 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.

[0064] In each external conductive member 320, the external connection surface portion 322 is exposed to the outside of the case body 210 (resin body portion 210R) in the first direction D1. The buried end portion 323 is an end portion on the opposite side to the external connection surface portion 322 side in the first direction D1, and is buried in the resin body portion 210R.

[0065] Each external conductive member 320 further has a third outer surface portion 324. The third outer surface portion 324 is located on the opposite side to the third inner surface portion 321. The third outer surface portion 324 is exposed to the outside of the case body 210 (resin body portion 210R) from one of the multiple holes 215. Each external conductive member 320 is provided with a further pressure release valve 325 capable of releasing pressure on the third inner surface portion 321 side to the third outer surface portion 324 side.

[0066] Each connecting conductive member 310 and each outer conductive member 320 is made of a metal such as, for example, stainless steel, aluminum, or copper.

[0067] In this embodiment, the power storage module 1 further includes a plurality of current collecting members 400. The plurality of current collecting members 400 are disposed between the positive electrode tab 112p of each electrode body 100 and the connection conductive member 310 or the external conductive member 320, and between the negative electrode tab 122n of each electrode body 100 and the connection conductive member 310 or the external conductive member 320. Each current collecting member 400 is joined to each positive electrode tab 112p or each 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.

[0068] The multiple current collecting members 400 may include a metal material such as aluminum or copper. The power storage module 1 does not necessarily need to include the current collecting members 400. When the power storage module 1 does not include the current collecting members 400, each of the positive electrode tabs 112p and each of the negative electrode tabs 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.

[0069] As described above, the energy storage module 1 according to an embodiment of the present disclosure includes a plurality of electrode bodies 100 and a case 200. The plurality of electrode bodies 100 are arranged in a first direction D1. The case 200 accommodates the plurality of electrode bodies 100. The case 200 includes a case body 210 and at least one partition wall portion 220. The case body 210 surrounds the plurality of electrode bodies 100. The partition wall portion 220 is located between the plurality of electrode bodies 100 adjacent to each other to partition the accommodation space S of the case body 210. The partition wall portion 220 includes a pair of resin layers 220R and a metal layer 220M. The pair of resin layers 220R are integrally formed with the case body 210 and are arranged in the first direction D1. The metal layer 220M is disposed between the pair of resin layers 220R and extends in a direction perpendicular to the first direction D1.

[0070] According to the above configuration, the metal layer 220M can prevent heat generated by the electrode body 100 arranged on one side of the partitioned storage space S from being transmitted to the other side of the storage space S via the partition portion 220. When the heat is transmitted to the metal layer 220M, the heat is diffused in a direction perpendicular to the first direction D1, and as a result, the heat is easily discharged to the outside of the case body 210.

[0071] In this embodiment, case body 210 has resin body portion 210R and metal portion 210M. Resin body portion 210R is molded integrally with partition portion 220. Metal portion 210M is disposed inside resin body portion 210R, is continuous with metal layer 220M, and has metal portion 210M that is exposed to the external space of case body 210.

[0072] According to the above configuration, heat transferred to metal layer 220M is easily dissipated to the outside of case body 210 via metal portion 210M.

[0073] In this embodiment, the metal portion 210M includes a bottom exposed portion 218. The bottom exposed portion 218 is disposed inside the bottom wall portion 211 and is exposed from the bottom wall portion 211.

[0074] According to the above configuration, heat transferred to the metal layer 220M is easily dissipated to the outside of the case body 210 via the bottom exposed portion 218.

[0075] In this embodiment, the metal portion 210M includes a lateral exposed portion 219. The metal portion 210M is disposed inside the peripheral side wall portion 212 and is exposed therefrom.

[0076] According to the above configuration, heat transferred to metal layer 220M is easily dissipated to the outside of case body 210 via side exposed portion 219.

[0077] The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims rather than the description of the embodiments above, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0078] 1 Energy storage module, 100 Electrode body, 100A First electrode body, 100B Second electrode body, 100C Third electrode body, 110 Positive electrode, 112 Positive electrode current collector foil, 112p Positive electrode tab, 114 Positive electrode active material layer, 120 Negative electrode, 122 Negative electrode 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, 210C Lid, 210M Metal portion, 210R Resin body portion, 211 Bottom wall portion, 212 Peripheral side wall portion, 213 First wall portion, 214 Second wall portion, 215 Hole portion, 217 welding portion, 218 bottom exposed portion, 219 side exposed portion, 220 partition portion, 220A first partition portion, 220B second partition portion, 220M metal layer, 220R resin layer, 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 external conductive member, 320B second external 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, OP opening, S Containment space, S1 section 1, S2 section 2, S3 section 3.

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 that surrounds the plurality of electrode bodies; at least one partition wall portion located between the adjacent electrode bodies to divide an accommodation space of the case body; The partition portion has a pair of resin layers and a metal layer, the pair of resin layers are integrally formed with the case body and are aligned in the first direction, The metal layer is disposed between the pair of resin layers and extends in a direction perpendicular to the first direction.

2. The case body includes: a resin main body portion integrally formed with the partition wall; The energy storage module according to claim 1 , further comprising a metal portion that is disposed inside the resin body, is continuous with the metal layer, and is exposed to an external space of the case body.

3. the resin body portion has a bottom wall portion located on one side in a second direction perpendicular to the first direction, and a peripheral side wall portion that is molded integrally with the bottom wall portion, stands in the second direction from a peripheral end of the bottom wall portion, and forms an opening facing the opposite side to the bottom wall portion, The case body further includes a lid that closes the opening and at least a portion of the lid that faces the peripheral side wall portion is made of a resin composition, The energy storage module according to claim 2 , wherein the metal portion includes a bottom exposed portion that is disposed inside the bottom wall portion and exposed from the bottom wall portion.

4. the resin body portion has a bottom wall portion located on one side in a second direction perpendicular to the first direction, and a peripheral side wall portion that is molded integrally with the bottom wall portion, stands in the second direction from a peripheral end of the bottom wall portion, and forms an opening facing the opposite side to the bottom wall portion, The case body further includes a lid that closes the opening and at least a portion of the lid that faces the peripheral side wall portion is made of a resin composition, The energy storage module according to claim 2 , wherein the metal portion includes a side exposed portion that is disposed inside the peripheral side wall portion and is exposed from the peripheral side wall portion.

5. the resin body portion has a bottom wall portion located on one side in a second direction perpendicular to the first direction, and a peripheral side wall portion that is molded integrally with the bottom wall portion, stands in the second direction from a peripheral end of the bottom wall portion, and forms an opening facing the opposite side to the bottom wall portion, The case body further includes a lid that closes the opening and at least a portion of the lid that faces the peripheral side wall portion is made of a resin composition, 3. The energy storage module according to claim 2, wherein the metal portion includes a bottom exposed portion disposed inside the bottom wall portion and exposed from the bottom wall portion, and a side exposed portion disposed inside the peripheral side wall portion and exposed from the peripheral side wall portion.

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