Power storage module

Abstract

The invention provides a power storage module. In a power storage module, a case accommodates a plurality of electrode bodies. The housing includes a housing main body and at least one partition wall portion. The case body surrounds the plurality of electrode bodies. The partition wall portion is located between a plurality of adjacent electrode bodies and defines an accommodation space of the case main body. The partition wall portion has a pair of resin layers and a metal layer. The pair of resin layers are integrally formed with the housing main body and are parallel to each other in the first direction. The metal layer is disposed between the pair of resin layers and extends in a direction orthogonal to the first direction.

Description

Technical Field

[0001] The present disclosure relates to a power storage module. Background Art

[0002] In the receiving portion of the battery case disclosed in Japanese Patent Publication No. 2019-106372, the lower wall is integrated with multiple (e.g., 3, 4 or more) side walls to form a space inside, and has an open surface opposite to the lower wall, and provides one or more (e.g., 2, 3, 4, 5 or more) partition walls in the space. Thus, the receiving portion includes multiple battery segment portions separated by one or more partition walls arranged in the space. Each battery segment portion can accommodate an electrode assembly. Summary of the invention

[0003] In the battery case disclosed in Japanese Patent Application Publication No. 2019-106372, heat generated from the electrode body in one section is easily transferred to other sections via the partition wall.

[0004] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a power storage module capable of suppressing the transfer of heat generated from an electrode body disposed on one side of a defined housing space to the other side of the housing space via a partition wall portion.

[0005] The storage module based on the present disclosure has a plurality of electrode bodies and a shell. The plurality of electrode bodies are arranged in parallel along a first direction. The shell accommodates the plurality of electrode bodies. The shell has a shell body and at least one partition wall portion. The shell body surrounds the plurality of electrode bodies. The partition wall portion is located between the plurality of electrode bodies adjacent to each other to define the accommodation space of the shell body. The partition wall portion has a pair of resin layers and a metal layer. The pair of resin layers are integrally formed with the shell body and are arranged in parallel along a first direction. The metal layer is arranged between the pair of resin layers and extends in a direction orthogonal to the first direction.

[0006] According to the above structure, the metal layer can suppress the transfer of heat generated by the electrode body arranged on one side of the defined receiving space to the other side of the receiving space via the partition wall portion. This is because if the heat is transferred to the metal layer, the heat diffuses in a direction orthogonal to the first direction, resulting in the heat being easily discharged to the outside of the shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when read in conjunction with the accompanying drawings.

[0008] Figure 1 It is a perspective view showing a power storage module according to one embodiment.

[0009] Figure 2This is an exploded perspective view of a power storage module according to one embodiment, in which a part of the power storage module is exploded.

[0010] Figure 3 Observe along the direction of the arrow on line III-III Figure 1 A cross-sectional view of a power storage module.

[0011] Figure 4 Observe along the direction of the arrow on line IV-IV Figure 1 A cross-sectional view of a power storage module.

[0012] Figure 5 Observe along the direction of the arrow on line VV Figure 1 A cross-sectional view of an electrode body in a power storage module. DETAILED DESCRIPTION

[0013] The embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that in the drawings referred to below, the same or equivalent components are denoted by the same reference numerals.

[0014] Figure 1 It is a perspective view showing a power storage module according to one embodiment. Figure 2 This is an exploded perspective view of a power storage module according to one embodiment, in which a part of the power storage module is exploded. Figure 3 Observe along the direction of the arrow on line III-III Figure 1 A cross-sectional view of a power storage module. Figure 4 Observe along the direction of the arrow on line IV-IV Figure 1 A cross-sectional view of a power storage module.

[0015] like Figure 1~Figure 4 As shown, a storage module 1 according to an embodiment of the present disclosure includes a plurality of electrode bodies 100, a shell 200, at least one connecting conductive member 310, and an external conductive member 320. The plurality of electrode bodies 100 are arranged along a first direction D1. The shell 200 accommodates the plurality of electrode bodies 100. The connecting conductive member 310 is arranged in parallel with the plurality of electrode bodies 100 in a third direction D3, and electrically connects the plurality of electrode bodies 100 adjacent to each other. It should be noted that the second direction D2 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.

[0016] In the present embodiment, the plurality of electrode bodies 100 include a first electrode body 100A, a second electrode body 100B, and a third electrode body 100C. When viewed from the first electrode body 100A, the third electrode body 100C is located on the opposite side of the second electrode body 100B. In the present embodiment, the second electrode body 100B is located at a position closest to the end in the first direction D1 among the plurality of electrode bodies 100. The third electrode body 100C is located at a position closest to the end on the side opposite to the second electrode body 100B in the first direction D1 among the plurality of electrode bodies 100. The plurality of electrode bodies 100 may include more than four electrode bodies.

[0017] Figure 5 Observe along the direction of the arrow on line VV Figure 1 A cross-sectional view of an electrode body in a power storage module. Figure 5 As shown, each of the plurality of electrode bodies 100 includes a plurality of electrodes 110 and 120 and a separator 130. In the present embodiment, the electrode body 100 is an electrode body for a secondary battery such as a lithium ion secondary battery.

[0018] like Figure 5 As shown, the plurality of electrodes 110 and 120 are arranged in a row along the first direction D1. The plurality of electrodes 110 and 120 include a plurality of positive electrodes 110 and a plurality of negative electrodes 120.

[0019] Each positive electrode 110 is formed in the third direction D3 (in Figure 5 Each positive electrode 110 has a positive electrode collector foil 112 and a positive electrode active material layer 114 provided on both sides of the positive electrode collector foil 112. The positive electrode collector foil 112 has a positive electrode tab 112p (see Figure 3 and Figure 4 ). The positive electrode tab 112p protrudes toward one side in the third direction D3.

[0020] Each negative electrode 120 is formed in a rectangular shape that is long in the third direction D3. Each negative electrode 120 includes a negative electrode collector foil 122 and negative electrode active material layers 124 provided on both sides of the negative electrode collector foil 122. The negative electrode collector foil 122 includes a negative electrode tab 122n (see FIG. 1 ) on which the negative electrode active material layer 124 is not provided. Figure 3 and Figure 4 ). The negative electrode tab 122n protrudes toward the other side in the third direction D3.

[0021] The separator 130 insulates the positive electrode 110 from the negative electrode 120. The separator 130 is made of an insulating material and has tiny gaps that allow ions to pass through. Figure 5 As shown, the partition 130 is formed in a zigzag shape.

[0022] The separator 130 has a rectangular shape before being formed into a zigzag shape. The separator 130 is formed into a zigzag shape and arranged between the electrodes 110 and 120. 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.

[0023] Each intervening portion 132a is interposed between a pair of electrodes 110 and 120 adjacent to each other in one direction. That is, each intervening portion 132a has a function of insulating the positive electrode 110 and the negative electrode 120. Each intervening portion 132a is composed of a rectangular region.

[0024] Each upper folded portion 132b connects the upper end of one of the plurality of sandwiching portions 132a and the upper end of a sandwiching portion 132a adjacent to the one sandwiching portion 132a on one side in one direction. In the present embodiment, the upper folded portion 132b is disposed above the positive electrode 110.

[0025] Each lower folded portion 132c connects the lower end of one of the plurality of clamping portions 132a and the lower end of the clamping portion 132a adjacent to the one of the plurality of clamping portions 132a on the other side in one direction. In the present 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.

[0026] The outermost covering portion 132d covers all the upper folded portions 132b and all the lower folded portions 132c. In more detail, the outermost covering portion 132d is wound around a central axis parallel to the third direction D3, while covering all the electrodes 110, 120, all the sandwiching portions 132a, all the upper folded portions 132b and all the lower folded portions 132c. The terminal 132e of the outermost covering portion 132d is set to 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 the present embodiment, the terminal 132e of the outermost covering portion 132d is arranged below each electrode 110, 120. It should be noted that the peripheral surface and the bottom surface of the plurality of electrodes 110, 120 and the separator 130 may be coated with an insulating film or may not be coated with an insulating film. The peripheral surfaces and bottom surfaces of the plurality of electrodes 110 and 120 and the separator 130 may be in direct contact with the housing 200 .

[0027] like Figure 1~Figure 4 As shown, the housing 200 includes a housing body 210 and at least one partition wall portion 220 .

[0028] The case body 210 surrounds the plurality of electrode bodies 100. The case body 210 includes a resin body portion 210R, a plurality of metal portions 210M, and a lid 210C.

[0029] The resin body portion 210R is made of a resin composition and includes a bottom wall portion 211 , a peripheral side wall portion 212 , and a hole portion 215 .

[0030] In the case body 210 (resin body 210R), the bottom wall 211 is located on one side in the second direction D2. The bottom wall 211 extends along the first direction D1 and the third direction D3. When viewed from the second direction D2, the bottom wall 211 has a rectangular shape.

[0031] The peripheral side wall portion 212 is formed 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.

[0032] 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 arranged in parallel along 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 arranged in parallel along the third direction D3. The pair of second wall portions 214 extend along the first direction D1.

[0033] The hole 215 is provided to expose a part of the connection conductive member 310 to the outside of the housing body 210 (resin body 210R). The hole 215 is closed by the connection conductive member 310. Specifically, the hole 215 is provided in the peripheral side wall 212, more specifically, in the second wall 214.

[0034] In the present embodiment, the resin body portion 210R has a plurality of holes 215 as the above-described holes 215. The external conductive member 320 is exposed from another hole 215 different from the above-described hole 215 among the plurality of holes 215.

[0035] The metal portion 210M is disposed inside the resin main body portion 210R. Details of the metal portion 210M will be described later.

[0036] The cover 210C closes the opening OP. In the present embodiment, at least a portion of the cover 210C facing the peripheral side wall portion 212 is made of a resin composition. The cover 210C has a flat plate-like or film-like outer shape.

[0037] The cover 210C may be a laminate including a cover resin layer and a shielding layer composed of the resin composition. Specifically, the cover 210C may be a laminated film in which a shielding layer composed of aluminum or the like is laminated on the cover resin layer. The cover 210C may be a plate-shaped member in which a metal plate such as aluminum is laminated on the cover resin layer. The shielding layer or the metal plate may be arranged inside the cover resin layer.

[0038] The cover 210C and the peripheral side wall 212 are thermally welded to form the welded portion 217 in the case body 210. Instead of forming the welded portion 217, the cover 210C and the peripheral side wall 212 may be joined to each other by other known joining methods such as adhesives.

[0039] The partition wall 220 is located between the adjacent electrode bodies 100 to define the housing space S of the case body 210. The case 200 of this embodiment has a plurality of partition walls 220. The plurality of partition walls 220 include a first partition wall 220A and a second partition wall 220B. The plurality of partition walls 220 may include three or more partition walls.

[0040] In the housing space S of the housing body 210, the partition wall portion 220 (first partition wall portion 220A) forms a first section S1 and a second section S2 adjacent to the first section S1 via the partition wall portion 220 (first partition wall portion 220A). In addition, in the housing space S, the first section S1 and a third section S3 adjacent to the first section S1 via the second partition wall portion 220B are formed by the second partition wall portion 220B. When viewed from the first section S1, the third section S3 is located on the opposite side of the second section S2.

[0041] The first electrode body 100A among the plurality of electrode bodies 100 is housed in the first section S1. The second electrode body 100B is housed in the second section S2. The third electrode body 100C is housed in the third section. An electrolyte is injected into the housing space S (the first section S1, the second section S2, and the third section S3). It should be noted that the electrolyte is not shown in the figure. There is no particular limitation on the method of injecting the electrolyte. The electrolyte may be injected from the opening OP before the opening OP is closed by the cover 210C.

[0042] Each of the plurality of partition walls 220 includes a pair of resin layers 220R and a metal layer 220M (see Figure 4 ). The pair of resin layers 220R are arranged in parallel along the first direction D1. The pair of resin layers 220R are made of a resin composition. The pair of resin layers 220R are integrally formed with the housing body 210. Specifically, the pair of resin layers 220R are integrally formed with the resin body portion 210R. More specifically, the pair of resin layers 220R are integrally formed with the bottom wall portion 211 and the pair of second wall portions 214 of the peripheral side wall portion 212, respectively.

[0043] It should be noted that in this embodiment, as the above-mentioned "integrated molding" method, there can be listed a method of simultaneously forming and joining each component in one step by a well-known method such as injection molding, or a method of separately forming a plurality of components and then joining them to each other by a well-known joining method such as welding, soldering or bonding.

[0044] It should be noted that the partition wall portions 220 and the cover 210C may or may not be joined to each other by thermal welding.

[0045] Here, the resin composition which can constitute the resin body portion 210R, the cover resin layer of the cover 210C, and the resin layer 220R of the partition wall portion 220 according to the present embodiment will be described.

[0046] The resin composition may include polycarbonate, polyethylene, polypropylene, polyethylene compound, polyamide, polyester, polyphenylene sulfide (PPS), polyphenylene oxide, polystyrene, polycyclic olefin copolymer, acrylonitrile-butadiene-styrene copolymer, liquid crystal polymer (LCP), fluorine resin, mixtures thereof, alloys thereof, or copolymers thereof as base polymers. The base polymer is not limited thereto.

[0047] The resin composition may include polyolefin, liquid crystal polymer, or fluorine resin as a base polymer. Polyolefin may include high-density polyethylene (HDPE). High-density polyethylene, liquid crystal polymer, or fluorine resin has a relatively low water vapor permeability. Therefore, the housing 200 including the resin main body 210R containing them has improved moisture permeability resistance.

[0048] The liquid crystal polymer may include a structural unit derived from a hydroxybenzoic acid oligomer. The liquid crystal polymer may include, in addition to the hydroxybenzoic acid oligomer, 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 a hydroxybenzoic acid (HBA) oligomer.

[0049] As fluorine resin, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE) or their mixture or copolymer etc. can be listed. Fluorine resin is hydrophobic. Therefore, based on the gross weight of resin composition, resin composition can contain, for example, about 20 weight % or less, about 15 weight % or less, about 10 weight % or less, about 3 weight % to about 10 weight %, about 5 weight % to about 10 weight % of fluorine resin. In the case where the content of fluorine resin is within the above-mentioned range, it can be considered that the molded product consisting of the resin composition has the effect of blocking moisture from the surface of the molded product in contact with the external air.

[0050] In this embodiment, the base polymer of the resin composition constituting the cover 210C and the base polymer of the resin composition constituting the pair of resin layers 220R of each of the resin body portion 210R and the plurality of partition wall portions 220 are preferably of the same structure. As a result, these components are easily welded to each other. Furthermore, the welded portion 217 can be easily formed. From the viewpoint of performing heat welding, the base polymer is also preferably polyethylene or polypropylene.

[0051] From the viewpoint of suppressing water vapor transmission rate, the resin composition may further contain an inorganic moisture absorbent or graphite. Furthermore, the resin composition may contain a known substance as a conventional moisture barrier substance in addition to graphite.

[0052] The metal layer 220M of the partition wall portion 220 is disposed between the 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.

[0053] Here, the details of the plurality of metal parts 210M disposed inside the resin main body part 210R are described. The plurality of metal parts 210M are respectively connected to the metal layer 220M of the partition wall part 220 (see Figure 1 and Figure 2 The plurality of metal parts 210M are respectively exposed to the external space of the housing body 210. The metal part 210M and the metal layer 220M are made of metal such as stainless steel, aluminum or copper.

[0054] The plurality of 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.

[0055] The pair of lateral exposed portions 219 are disposed inside the peripheral side wall portion 212. The pair of lateral exposed portions 219 are exposed from the peripheral side wall portion 212. Specifically, the pair of lateral exposed portions 219 are disposed inside the pair of second wall portions 214, respectively. The pair of lateral exposed portions 219 are exposed from the pair of second wall portions 214, respectively.

[0056] Next, the connection conductive member 310 and the external conductive member 320 are described. In the present embodiment, the power storage module 1 includes a plurality of connection conductive members 310. The plurality of connection conductive members 310 include a first connection conductive member 310A and a second connection conductive member 310B. The plurality of connection conductive members 310 may include three or more connection conductive members. Furthermore, in the present embodiment, the power storage module 1 includes a first external conductive member 320A and a second external conductive member 320B as the external conductive member 320.

[0057] The connecting conductive member 310 (the first connecting conductive member 310A and the 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.

[0058] 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 buried in the peripheral side wall portion 212 (the second wall portion 214 on one side) of the resin body portion 210R. 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 buried in the peripheral side wall portion 212 (the second wall portion 214 on one side) of the resin body portion 210R.

[0059] In the first connecting conductive member 310A, the first inner surface portion 312A is exposed to the first section S1 and electrically connected to the electrode tab (negative tab 122n) of the first electrode body 100A. The second inner surface portion 312B is exposed to the second section S2 and electrically connected to the electrode tab (positive tab 112p) of the second electrode body 100B.

[0060] In the second connection conductive member 310B, the first end portion 311A ​​is an end portion on one side in the first direction D1 of the second connection conductive member 310B, and is buried in the peripheral side wall portion 212 (the other second wall portion 214) of the resin body portion 210R. The second end portion 311B is an end portion on the other side in the first direction D1 of the second connection conductive member 310B, and is buried in the peripheral side wall portion 212 (the other second wall portion 214) of the resin body portion 210R.

[0061] In the second connecting conductive member 310B, the first inner surface portion 312A is exposed to the first section S1 and electrically connected to the electrode tab (positive tab 112p) of the first electrode body 100A. The second inner surface portion 312B is exposed to the third section S3 and electrically connected to the electrode tab (negative tab 122n) of the third electrode body 100C.

[0062] In each connection 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 housing body 210 through the hole portion 215. Each connection conductive member 310 is provided with a pressure relief valve 314 capable of releasing the pressure on the first inner surface portion 312A side to the first outer surface portion 313A side.

[0063] In each connection 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 housing body 210 from the other hole portion 215. Each connection conductive member 310 is provided with another pressure relief valve 315 capable of releasing the pressure on the second inner surface portion 312B side to the first outer surface portion 313A side.

[0064] The first external conductive member 320A is parallel to 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 parallel to the second electrode body 100B in the third direction D3 and is electrically connected to the second electrode body 100B.

[0065] Each external conductive member 320 has a third inner surface portion 321 , an external connection surface portion 322 , and a buried end portion 323 .

[0066] In the first external conductive member 320A, the third inner surface portion 321 is exposed to the housing space S (third section S3) and is electrically connected to the electrode tab (positive 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 section S2) and is electrically connected to the electrode tab (negative tab 122n) of the second electrode body 100B.

[0067] 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 opposite to the external connection surface portion 322 in the first direction D1 and is buried in the resin body portion 210R.

[0068] Each external conductive member 320 further includes a third external surface portion 324. The third external surface portion 324 is located on the opposite side of the third inner surface portion 321. The third external surface portion 324 is exposed to the outside of the housing body 210 (resin body portion 210R) from one of the plurality of holes 215. Each external conductive member 320 is provided with another pressure relief valve 325 capable of releasing the pressure on the third inner surface portion 321 side to the third external surface portion 324 side.

[0069] Each connection conductive member 310 and each external conductive member 320 are made of metal such as stainless steel, aluminum, or copper.

[0070] In the present embodiment, the power 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 body 100 and the connecting conductive member 310 or the external conductive member 320, and between the negative electrode tab 122n of each electrode body 100 and the connecting conductive member 310 or the external conductive member 320. Each current collecting member 400 is respectively 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.

[0071] The plurality of current collecting members 400 may contain metal materials such as aluminum or copper. It should be noted that the power storage module 1 may not include the current collecting members 400. In the case where the current collecting members 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.

[0072] As described above, the storage module 1 of one embodiment of the present disclosure includes a plurality of electrode bodies 100 and a shell 200. The plurality of electrode bodies 100 are arranged in parallel along the first direction D1. The shell 200 accommodates the plurality of electrode bodies 100. The shell 200 has a shell body 210 and at least one partition wall portion 220. The shell 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 and defines the accommodation space S of the shell 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 formed with the shell body 210 and are arranged in parallel with each other in the first direction D1. The metal layer 220M is arranged between the pair of resin layers 220R and extends in a direction orthogonal to the first direction D1.

[0073] According to the above structure, the heat generated by the electrode body 100 arranged on one side of the defined accommodation space S can be suppressed from being transferred to the other side of the accommodation space S via the partition wall portion 220 by the metal layer 220M. This is because when the heat is transferred to the metal layer 220M, the heat diffuses in a direction orthogonal to the first direction D1, and as a result, the heat is easily discharged to the outside of the case body 210.

[0074] In this embodiment, the case body 210 includes a resin body 210R and a metal part 210M. The resin body 210R is integrally formed with the partition wall 220. The metal part 210M is disposed inside the resin body 210R, connected to the metal layer 220M, and exposed to the outside space of the case body 210.

[0075] According to the above structure, the heat transferred to the metal layer 220M is more easily discharged to the outside of the case body 210 via the metal portion 210M.

[0076] In addition, in the present 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 .

[0077] According to the above structure, the heat transferred to the metal layer 220M can be more easily discharged to the outside of the case body 210 through the bottom exposed portion 218 .

[0078] In addition, in the present embodiment, the metal portion 210M includes the side exposed portion 219 . The metal portion 210M is disposed inside the peripheral side wall portion 212 and is exposed from the peripheral side wall portion 212 .

[0079] According to the above-described structure, the heat transferred to the metal layer 220M can be more easily discharged to the outside of the case body 210 through the side exposed portion 219 .

[0080] Although the embodiments of the present invention have been described, it should be considered that the embodiments disclosed this time are illustrative in all points and are not restrictive. The scope of the present invention is disclosed by the claims, and all modifications within the meaning and scope equivalent to the claims are included.

Claims

1. A power storage module comprising: A plurality of electrode bodies are arranged in parallel along a first direction; and a shell, accommodating the plurality of electrode bodies, The housing has: a shell body, surrounding the plurality of electrode bodies; and at least one partition wall portion is located between the plurality of electrode bodies adjacent to each other to define a receiving space of the housing body, The partition wall portion includes a pair of resin layers and a metal layer, The pair of resin layers are integrally formed with the housing body and are arranged side by side along 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 power storage module according to claim 1, wherein: The housing body has: A resin main body portion formed integrally with the partition wall portion; and The metal portion is disposed inside the resin main body portion, connected to the metal layer, and exposed to the external space of the case main body.

3. The power storage module according to claim 2, wherein: The resin body has a bottom wall and a peripheral side wall, the bottom wall is located on one side in a second direction orthogonal to the first direction, the peripheral side wall is integrally formed with the bottom wall and rises from a peripheral end of the bottom wall toward the second direction to form an opening facing the opposite side of the bottom wall. The housing body further includes a cover, the cover closes the opening, and at least a portion of the cover facing the peripheral side wall portion is made of a resin composition. The metal portion includes a bottom exposed portion that is arranged inside the bottom wall portion and exposed from the bottom wall portion.

4. The power storage module according to claim 2, wherein: The resin body has a bottom wall and a peripheral side wall, the bottom wall is located on one side in a second direction orthogonal to the first direction, the peripheral side wall is integrally formed with the bottom wall and rises from a peripheral end of the bottom wall toward the second direction to form an opening facing the opposite side of the bottom wall. The housing body further includes a cover, the cover closes the opening, and at least a portion of the cover facing the peripheral side wall portion is made of a resin composition. The metal portion includes a lateral exposed portion that is disposed inside the peripheral side wall portion and exposed from the peripheral side wall portion.

5. The power storage module according to claim 2, wherein: The resin body has a bottom wall and a peripheral side wall, the bottom wall is located on one side in a second direction orthogonal to the first direction, the peripheral side wall is integrally formed with the bottom wall and rises from a peripheral end of the bottom wall toward the second direction to form an opening facing the opposite side of the bottom wall. The housing body further includes a cover, the cover closes the opening, and at least a portion of the cover facing the peripheral side wall portion is made of a resin composition. The metal portion includes a bottom exposed portion and a side exposed portion. The bottom exposed portion is arranged inside the bottom wall portion and exposed from the bottom wall portion. The side exposed portion is arranged inside the peripheral side wall portion and exposed from the peripheral side wall portion.

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