Energy 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 a power storage module.

Background Art

[0002] The accommodation part of the battery case disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2019-106372) has a lower wall and a plurality (for example, 3, 4, or more) of side walls integrated to form a space inside, has an open surface facing the lower wall, and one or more (for example, 2, 3, 4, 5, or more) partition walls are provided in the space. Thereby, the accommodation part includes a plurality of battery compartment parts separated by one or more partition walls arranged in the space. Each battery compartment part can accommodate an electrode assembly respectively.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the battery case disclosed in Patent Document 1, heat generated from the electrode body in one compartment easily transfers to other compartments through the partition wall.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a power storage module capable of suppressing heat generated from an electrode body arranged on one side of a partitioned accommodation space from transferring to the other side of the accommodation space through a partition wall part.

Means for Solving the Problems

[0006] The energy storage module according to this disclosure comprises a plurality of electrode bodies and a case. The plurality of electrode bodies are arranged 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 adjacent plurality of electrode bodies and divides the housing space of the case body. The partition wall has a pair of resin layers and a metal layer. The pair of resin layers are integrally molded with the case body and are arranged in a first direction. The metal layer is positioned 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 suppress the transfer of heat generated from the electrode body located on one side of the partitioned containment space to the other side of the containment space through the partition wall. This is because when the heat is transferred to the metal layer, it diffuses in a direction perpendicular to the first direction, and as a result, the heat is easily dissipated to the outside of the case body. [Effects of the Invention]

[0008] According to this disclosure, it is possible to suppress the transfer of heat generated from an electrode body located on one side of a partitioned containment space to the other side of the containment space through the partition wall. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing a power storage module according to one embodiment. [Figure 2] This is a partially disassembled perspective view of a battery storage module according to one embodiment. [Figure 3] Figure 1 is a cross-sectional view of the energy storage module as seen in the direction of the arrow III-III. [Figure 4] Figure 1 is a cross-sectional view of the energy storage module as seen in the direction of the IV-IV arrow. [Figure 5] Figure 1 is a cross-sectional view of the electrode body in the energy storage module, viewed in the direction of the VV arrow. [Modes for carrying out the invention]

[0010] Each embodiment of this disclosure will be described with reference to the drawings. In the drawings referred to below, the same or equivalent components are given the same number.

[0011] Figure 1 is a perspective view showing a battery storage module according to one embodiment. Figure 2 is an exploded perspective view of the battery storage module according to one embodiment, partially disassembled. Figure 3 is a cross-sectional view of the battery storage module of Figure 1, viewed in the direction of the arrow III-III. Figure 4 is a cross-sectional view of the battery storage module of Figure 1, viewed in the direction of the arrow IV-IV.

[0012] As shown in Figures 1 to 4, an energy storage module 1 according to one embodiment of the present disclosure comprises 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 houses the plurality of electrode bodies 100. The connecting conductive member 310 is arranged in a third direction D3 with the plurality of electrode bodies 100 and electrically connects adjacent electrode bodies 100 to each other. The second direction D2, which will be described later, is a direction orthogonal to the first direction D1, and the third direction D3 is a direction orthogonal to both the first direction D1 and the second direction D2.

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

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

[0015] As shown in Figure 5, the multiple electrodes 110, 120 are arranged in a line in the first direction D1. The multiple electrodes 110, 120 consist of multiple positive electrodes 110 and multiple negative electrodes 120.

[0016] Each positive electrode 110 is formed in a rectangular shape that is elongated in the third direction D3 (the direction perpendicular to the plane of the paper in Figure 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 Figures 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 elongated 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 Figures 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 insulates the positive electrode 110 and the negative electrode 120. The separator 130 is made of an insulating material and has minute voids that allow ion permeation. As shown in Figure 5, the separator 130 is formed in a zigzag shape.

[0019] Separator 130 has a rectangular shape in a state before being formed into a zigzag shape. Separator 130 is arranged while being formed into a zigzag shape between each pair of electrodes 110 and 120. Separator 130 has a plurality of intervening portions 132a, a plurality of upward folding portions 132b, a plurality of downward folding portions 132c, and an outermost covering portion 132d.

[0020] Each intervening portion 132a intervenes between a pair of electrodes 110 and 120 that are adjacent to each other in one direction. That is, each intervening portion 132a has a function of insulating between the positive electrode 110 and the negative electrode 120. Each intervening portion 132a is composed of a rectangular region.

[0021] Each upward folding portion 132b connects the upper end portion of one intervening portion 132a among the plurality of intervening portions 132a and the upper end portion of the intervening portion 132a adjacent to the one intervening portion 132a on one side in one direction among the plurality of intervening portions 132a. In the present embodiment, the upward folding portion 132b is arranged above the positive electrode 110.

[0022] Each downward folding portion 132c connects the lower end portion of the one intervening portion among the plurality of intervening portions 132a and the lower end portion of the intervening portion 132a adjacent to the one intervening portion on the other side in one direction among the plurality of intervening portions 132a. In the present embodiment, the downward folding portion 132c is arranged below the negative electrode 120. In other words, the negative electrode 120 is arranged on the downward folding portion 132c.

[0023] The outermost covering portion 132d covers each upper folded portion 132b and each lower folded portion 132c together. More specifically, the outermost covering portion 132d covers all electrodes 110, 120, all intervening portions 132a, all upper folded portions 132b, and all lower folded portions 132c together by winding around a central axis parallel to the third direction D3. The end portion 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 portion 132e of the outermost covering portion 132d is provided below each electrode 110, 120. Note that the circumferential 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 Figures 1 to 4, the case 200 has a case body 210 and at least one partition wall portion 220.

[0025] The case body 210 surrounds 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. The resin body portion 210R has a bottom wall portion 211, a circumferential 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. Viewed from the second direction D2, the bottom wall portion 211 has a rectangular outer shape.

[0028] The circumferential side wall portion 212 is integrally molded with the bottom wall portion 211. The circumferential side wall portion 212 rises from the circumferential end of the bottom wall portion 211 in a second direction D2. The circumferential side wall portion 212 forms an opening OP facing away from the bottom wall portion 211.

[0029] The circumferential 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 a first direction D1. The pair of first wall portions 213 extend along a third direction D3. The pair of second wall portions 214 are aligned in a third direction D3. The pair of second wall portions 214 extend along a first direction D1.

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

[0031] In this embodiment, the resin body portion 210R has a plurality of holes 215 as described above. Of the plurality of holes 215, the external conductive member 320 is exposed through one hole 215 that is different from the holes 215 described above.

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

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

[0034] The lid 210C may be a laminate comprising 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 the lid resin layer. The lid 210C may also be a plate-like member in which a metal plate such as aluminum is laminated to the lid resin layer. The barrier layer or metal plate may be placed inside the lid resin layer.

[0035] The lid 210C and the peripheral side wall portion 212 are heat-welded to each other, thereby forming a welded portion 217 on the case body 210. The lid 210C and the peripheral side wall portion 212 may be joined to each other by other known joining methods such as adhesives instead of forming the welded portion 217.

[0036] The partition wall 220 is located between a plurality of adjacent electrode bodies 100 and divides the housing space S of the case body 210. The case 200 according to this embodiment has a plurality of partition wall sections 220. The plurality of partition wall sections 220 includes a first partition wall section 220A and a second partition wall section 220B. The plurality of partition wall sections 220 may include three or more partition wall sections.

[0037] In the storage space S of the case body 210, a partition wall 220 (first partition wall 220A) forms a first section S1 and a second section S2 adjacent to the first section S1 via the partition wall 220 (first partition wall 220A). In addition, a second partition wall 220B forms a third section S3 adjacent to the first section S1 via the second partition wall 220B in the storage space S. The third section S3 is located opposite the second section S2 when 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, and third compartment S3). The electrolyte is not shown in the figure. The method of injecting the electrolyte is not particularly limited. The electrolyte may be injected through the opening OP before the opening OP is closed by the lid 210C.

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

[0040] In this embodiment, the "integrally molded" method described above includes a method in which each component is molded and joined simultaneously in a single 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 welding, bonding, or adhesive bonding.

[0041] Each partition wall 220 and lid 210C may or may not be joined to each other by heat welding.

[0042] Here, we will describe the resin compositions that can constitute the resin body portion 210R, the resin layer for the lid of the lid 210C, and the resin layer 220R of the partition wall portion 220 in this embodiment.

[0043] The above resin composition may include, 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), fluororesin, mixtures thereof, alloys thereof, or copolymers thereof. The base polymer is not limited to these.

[0044] The above resin composition may include a polyolefin, a liquid crystal polymer, or a fluororesin as the base polymer. The polyolefin may include high-density polyethylene (HDPE). High-density polyethylene, liquid crystal polymers, or fluororesins have relatively low water vapor permeability. Therefore, the case 200, which includes the resin body 210R containing these materials, has improved moisture resistance.

[0045] Liquid crystal polymers may contain structural units derived from oligomers of hydroxybenzoic acid. In addition to oligomers of hydroxybenzoic acid, liquid crystal polymers 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), copolymerized with oligomers of hydroxybenzoic acid (HBA).

[0046] Examples of fluororesins include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), or 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% by weight or less, about 15% by weight or less, about 10% by weight or less, about 3% to about 10% by weight, or about 5% to about 10% by weight of fluororesin. When the fluororesin content is within the above ranges, it is considered that a molded article made from the resin composition has the 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 and the base polymer of the resin composition constituting each pair of resin layers 220R of the resin body portion 210R and the plurality of partition portions 220 are the same. This allows these components to be easily welded to each other, thereby easily forming the welded portion 217. From the viewpoint of performing heat welding, it is also preferable that the base polymer be polyethylene or polypropylene.

[0048] The above resin composition may further contain an inorganic desiccant or graphite from the viewpoint of suppressing water vapor transmission. In addition, the above resin composition may further contain substances known as existing moisture barrier materials, in addition to graphite.

[0049] The metal layer 220M in the partition wall 220 is positioned 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, we will describe in detail the multiple metal parts 210M located inside the resin body 210R. Each of the multiple metal parts 210M is connected to the metal layer 220M of the partition wall 220 (see Figures 1 and 2, etc.). Each of the multiple metal parts 210M is exposed to the external space of the case body 210. The metal parts 210M and the metal layer 220M are made of a metal such as stainless steel, aluminum, or copper.

[0051] Multiple metal parts 210M include a bottom exposed portion 218 and a pair of lateral exposed portions 219. The bottom exposed portion 218 is located inside the bottom wall portion 211. The bottom exposed portion 218 is exposed from the bottom wall portion 211.

[0052] The pair of lateral exposed portions 219 are located inside the circumferential side wall portion 212. The pair of lateral exposed portions 219 are exposed from the circumferential side wall portion 212. Specifically, each of the pair of lateral exposed portions 219 is located inside the pair of second wall portions 214. Each of the pair of lateral exposed portions 219 is exposed from the pair of second wall portions 214.

[0053] Next, the connecting conductive member 310 and the external conductive member 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 includes 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. In addition, 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.

[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 connecting conductive member 310A, the first end portion 311A ​​is one end portion of the first connecting conductive member 310A in the first direction D1 and is embedded in the circumferential side wall portion 212 (one second wall portion 214) of the resin main body portion 210R. The second end portion 311B is the other end portion of the first connecting conductive member 310A in the first direction D1 and is embedded in the circumferential side wall portion 212 (one second wall portion 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 compartment 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 compartment S2 and is electrically connected to the electrode tab (positive electrode tab 112p) of the second electrode body 100B.

[0057] In the second connecting conductive member 310B, the first end portion 311A ​​is one end portion of the second connecting conductive member 310B in the first direction D1 and is embedded in the circumferential side wall portion 212 (the other second wall portion 214) of the resin main body portion 210R. The second end portion 311B is the other end portion of the second connecting conductive member 310B in the first direction D1 and is embedded in the circumferential side wall portion 212 (the other second wall portion 214) of the resin main body portion 210R.

[0058] In the second connecting conductive member 310B, the first inner surface portion 312A is exposed to the first compartment 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 compartment 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 of the first inner surface portion 312A and is exposed to the outside of the case body 210 through the hole 215. Each connecting conductive member 310 is provided with a pressure relief valve 314 that can release the pressure from 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 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 relief valve 315 that can release the pressure from 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 an embedded end portion 323.

[0063] In the first external conductive member 320A, the third inner surface portion 321 is exposed to the housing space S (third compartment 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 housing space S (second compartment 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 embedded end portion 323 is the end opposite to the external connection surface portion 322 side in the first direction D1, and is embedded 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 of 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) through one of a plurality of holes 215. Each external conductive member 320 is provided with another pressure relief valve 325 that can release the pressure from the third inner surface portion 321 side to the third outer surface portion 324 side.

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

[0067] In this embodiment, the energy storage module 1 further comprises a plurality of current collectors 400. Each of the plurality of current collectors 400 is positioned between the positive electrode tab 112p of each electrode body 100 and the connecting conductive member 310 or external conductive member 320, and between the negative electrode tab 122n of each electrode body 100 and the connecting conductive member 310 or external conductive member 320. Each current collector 400 is joined to each positive electrode tab 112p or each negative electrode tab 122n by welding. Each current collector 400 is joined to an adjacent first inner surface portion 312A, second inner surface portion 312B, or third inner surface portion 321 by welding.

[0068] The multiple current collectors 400 may include, for example, a metallic material such as aluminum or copper. Note that the energy storage module 1 does not necessarily include the current collectors 400. If the current collectors 400 are not included, 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.

[0069] As described above, an energy storage module 1 according to one embodiment of the present disclosure comprises 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 houses the plurality of electrode bodies 100. The case 200 has 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 adjacent plurality of electrode bodies 100 and partitions the housing space S of the case body 210. The partition wall portion 220 has a pair of resin layers 220R and a metal layer 220M. The pair of resin layers 220R are integrally molded with the case body 210 and are arranged in a first direction D1. The metal layer 220M is positioned 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 suppress the transfer of heat generated by the electrode body 100, which is located on one side of the partitioned housing space S, to the other side of the housing space S via the partition wall 220. This is because when the heat is transferred 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 dissipated to the outside of the case body 210.

[0071] Furthermore, in this embodiment, the case body 210 has a resin body portion 210R and a metal portion 210M. The resin body portion 210R is integrally molded with the partition portion 220. The metal portion 210M is located inside the resin body portion 210R, is connected to the metal layer 220M, and is exposed to the external space of the case body 210.

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

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

[0074] With the above configuration, the 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] Furthermore, in this embodiment, the metal portion 210M includes a lateral exposed portion 219. The metal portion 210M is positioned inside the circumferential side wall portion 212 and is exposed from the circumferential side wall portion 212.

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

[0077] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments above, and further includes all modifications within the meaning and scope equivalent to 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 Intervening part, 132b Upper folded part, 132c Lower folded part, 132d Outermost covering part, 132e Termination, 200 Case, 210 Case body, 210C Lid, 210M Metal part, 210R Resin body part, 211 Bottom wall part, 212 Peripheral side wall part, 213 First wall part, 214 Second wall part, 215 Hole, 217 Welded part, 218 Bottom exposed part, 219 Side exposed part, 220 Partition wall part, 220A First partition wall part, 220B Second partition wall part, 220M Metal layer, 220R Resin layer, 310 Connecting conductive member, 310A First connecting conductive member, 310B Second connecting conductive member, 311A ​​First end, 311B Second end, 312A First inner surface part, 312B Second inner surface part, 313A First outer surface part, 313B Second outer surface part, 314, 315, 325 Pressure relief valve, 320 External conductive member, 320A First external conductive member, 320B Second external conductive member, 321 Third inner surface part, 322 External connecting surface part, 323 Embedded end, 324 Third outer surface part, 400 Current collector member, OP Opening, S Containment space, S1 Section 1, S2 Section 2, S3 Section 3.

Claims

1. Multiple electrode bodies arranged in the first direction, The system comprises a case for housing the plurality of electrode bodies, The aforementioned case is, A case body surrounding the aforementioned multiple electrode bodies, It has at least one partition wall that is located between the plurality of adjacent electrode bodies and divides the housing space of the case body, The partition wall portion has a pair of resin layers and a metal layer. The pair of resin layers are integrally molded with the case body and are arranged relative to each other in the first direction. The metal layer is positioned between the pair of resin layers and extends in a direction perpendicular to the first direction. The aforementioned case body is A resin body portion molded integrally with the partition wall portion, It has a metal part that is disposed inside the resin body, connected to the metal layer, and exposed to the external space of the case body. The resin body portion has a bottom wall portion located on one side in a second direction perpendicular to the first direction, and a circumferential wall portion integrally molded with the bottom wall portion, which rises from the circumferential end of the bottom wall portion in the second direction and forms an opening facing the opposite side from the bottom wall portion. The aforementioned metal part includes a laterally exposed portion, The lateral exposed portion extends from the metal layer in a third direction perpendicular to both the first and second directions, penetrates the circumferential wall portion, and is exposed from the circumferential wall portion. The energy storage module comprises a single plate-shaped member formed integrally with the metal layer and the metal portion, extending along both the second and third directions.

2. The energy storage module according to claim 1, wherein the case body further has a lid that closes the opening and at least the portion facing the peripheral side wall is made of a resin composition.

3. The energy storage module according to claim 1, wherein the metal portion further includes a bottom exposed portion that is disposed inside the bottom wall portion and exposed from the bottom wall portion.

4. The aforementioned metal part further includes a bottom exposed portion, The energy storage module according to claim 1, wherein the bottom exposed portion extends from the metal layer in the second direction, penetrates the bottom wall portion, and is exposed from the bottom wall portion.

5. The metal portion further includes a second lateral exposed portion, The energy storage module according to any one of claims 1 to 4, wherein the second lateral exposed portion extends from the metal layer in the third direction on the opposite side of the lateral exposed portion, penetrates the circumferential side wall portion, and is exposed from the circumferential side wall portion.

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