Power storage module

Abstract

The utility model provides an electric 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 housing portion of the battery case disclosed in Japanese Unexamined Patent Application Publication No. 2019-106372, the lower wall is integrated with a plurality of (for example, 3, 4, or more) side walls to form a space inside, and has an open surface opposite to the lower wall, and one or more (for example, 2, 3, 4, 5, or more) partition walls are provided in the space. Thus, the housing portion includes a plurality of battery section portions separated by one or more partition walls disposed in the space. An electrode assembly can be housed in each battery section portion. Summary of the Utility Model

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

[0004] In view of the above problems, the present disclosure is made, and an object thereof 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 power storage module based on the present disclosure includes a plurality of electrode bodies and a housing. The plurality of electrode bodies are arranged in parallel in a first direction. The housing houses the plurality of electrode bodies. The housing has a housing main body and at least one partition wall portion. The housing main body surrounds the plurality of electrode bodies. The partition wall portion is located between the plurality of adjacent electrode bodies to define a housing space of the housing 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 arranged in parallel with each other in the first direction. The metal layer is disposed between the pair of resin layers and extends along a direction orthogonal to the first direction.

[0006] According to the above structure, the metal layer can suppress the transfer of heat generated from an electrode body disposed on one side of the defined housing space to the other side of the housing 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, and as a result, the heat easily discharges to the outside of the housing main body. Description of the Drawings

[0007] The above and other objects, features, aspects, and advantages of the present utility model are clearly understood from the following detailed description of the present utility model understood in association with the 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 of an embodiment, with partial disassembly.

[0010] Figure 3 This is a cross-sectional view of the power storage module viewed in the direction of the arrow along line III-III. Figure 1

[0011] Figure 4 This is a cross-sectional view of the power storage module viewed in the direction of the arrow along line IV-IV. Figure 1

[0012] Figure 5 This is a cross-sectional view of the electrode body in the power storage module viewed in the direction of the arrow along line V-V. Figure 1 Specific embodiments

[0013] Regarding each embodiment of the present disclosure, it will be described with reference to the accompanying drawings. It should be noted that in the following accompanying drawings referred to, the same reference numerals are assigned to the same or equivalent components.

[0014] Figure 1 This is a perspective view of a power storage module of an embodiment. Figure 2 This is an exploded perspective view of a power storage module of an embodiment, with partial disassembly. Figure 3 This is a cross-sectional view of the power storage module viewed in the direction of the arrow along line III-III. Figure 1 Figure 4 This is a cross-sectional view of the power storage module viewed in the direction of the arrow along line IV-IV. Figure 1

[0015] As Figures 1 to 4 shown, a power storage module 1 of an embodiment of the present disclosure includes a plurality of electrode bodies 100, a housing 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 housing 200 houses the plurality of electrode bodies 100. The connecting conductive member 310 is juxtaposed with the plurality of electrode bodies 100 in a third direction D3 and electrically connects the plurality of adjacent electrode bodies 100 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 the 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 the position closest to the end on the opposite side of 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 four or more electrode bodies.

[0017] Figure 5 is a cross-sectional view of the electrode body in the power storage module viewed in the arrow direction along line V-V. As Figure 1 shown, the plurality of electrode bodies 100 each include a plurality of electrodes 110, 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. Figure 5 shown, the plurality of electrodes 110, 120 are arranged along the first direction D1. The plurality of electrodes 110, 120 include a plurality of positive electrodes 110 and a plurality of negative electrodes 120.

[0018] As Figure 5 shown, the plurality of electrodes 110, 120 are arranged in a row along the first direction D1. Each positive electrode 110 is formed in a rectangular shape that is long in the third direction D3 (the direction orthogonal to the paper surface in

[0019] ). Each positive electrode 110 has a positive current collector foil 112 and positive active material layers 114 provided on both surfaces of the positive current collector foil 112. The positive current collector foil 112 has a positive electrode tab 112p (refer to Figure 5 and Figure 3 and Figure 4 ) where the positive active material layer 114 is not provided. 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 has a negative current collector foil 122 and negative active material layers 124 provided on both surfaces of the negative current collector foil 122. The negative current collector foil 122 has a negative electrode tab 122n (refer to Figure 3 and Figure 4 ) where the negative active material layer 124 is not provided. The negative electrode tab 122n protrudes toward the other side in the third direction D3.

[0021] The separator 130 insulates 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 Figure 5 shown, the separator 130 is formed in a meandering shape.

[0022] The separator 130 has a rectangular shape before being formed into a zigzag shape. The separator 130 is disposed in a zigzag shape between the respective electrodes 110 and 120. The separator 130 has a plurality of sandwiching portions 132a, a plurality of upper folding portions 132b, a plurality of lower folding portions 132c, and an outermost covering portion 132d.

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

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

[0025] Each lower folding portion 132c connects the lower end portion of the above one sandwiching portion 132a among the plurality of sandwiching portions 132a and the lower end portion of the sandwiching portion 132a adjacent to the above one sandwiching portion on the other side in one direction among the plurality of sandwiching portions 132a. In the present embodiment, the lower folding portion 132c is disposed below the negative electrode 120. In other words, the negative electrode 120 is disposed on the lower folding portion 132c.

[0026] The outermost covering portion 132d covers the respective upper folding portions 132b and the respective lower folding portions 132c together. More specifically, the outermost covering portion 132d covers all the electrodes 110, 120, all the sandwiching portions 132a, all the upper folding portions 132b, and all the lower folding portions 132c together while winding around a central axis parallel to the third direction D3. 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 disposed below the respective electrodes 110 and 120. It should be noted that an insulating film may or may not be covered on the circumferential surface and the bottom surface of the plurality of electrodes 110, 120, and the separator 130. The circumferential surface and the bottom surface of the plurality of electrodes 110, 120, and the separator 130 may be in direct contact with the housing 200.

[0027] As Figures 1 to 4 shown, the housing 200 has a housing main body 210 and at least one partition wall portion 220.

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

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

[0030] In the housing main body 210 (resin main body 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.

[0031] The peripheral side wall portion 212 is integrally formed with the bottom wall portion 211. The peripheral side wall portion 212 stands up from the peripheral edge of the bottom wall portion 211 in the second direction D2. The peripheral side wall portion 212 forms an opening OP facing the opposite side 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 side by side 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 arranged side by side along the third direction D3. The pair of second wall portions 214 extend along the first direction D1.

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

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

[0035] The metal portion 210M is disposed inside the resin main body 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 composed of a resin composition. The cover 210C has a flat plate shape or a film shape.

[0037] The cover 210C may be a laminate including a cover resin layer made of the resin composition and a shielding layer. Specifically, the cover 210C may be a laminated film in which a shielding layer made of aluminum or the like is laminated on the cover resin layer. The cover 210C may be a plate-like 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 disposed inside the cover resin layer.

[0038] The welded portion 217 is formed in the housing body 210 by heat-sealing the lid 210C and the peripheral side wall portion 212 to each other. Instead of forming the welded portion 217, the lid 210C and the peripheral side wall portion 212 can be joined to each other by other known joining methods such as an adhesive.

[0039] The partition wall portions 220 are located between the plurality of electrode bodies 100 adjacent to each other to define the accommodation space S of the housing body 210. The housing 200 of the present 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.

[0040] In the accommodation space S of the housing body 210, a first section S1 is formed by the partition wall portion 220 (the first partition wall portion 220A), and a second section S2 adjacent to the first section S1 across the partition wall portion 220 (the first partition wall portion 220A). Further, in the accommodation space S, a first section S1 is formed by the second partition wall portion 220B, and a third section S3 adjacent to the first section S1 across 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 accommodated in the first section S1. The second electrode body 100B is accommodated in the second section S2. The third electrode body 100C is accommodated in the third section. An electrolytic solution is injected into the accommodation space S (the first section S1, the second section S2, the third section S3). It should be noted that the electrolytic solution is not shown. The method of injecting the electrolytic solution is not particularly limited. The electrolytic solution can be injected from the opening OP before closing the opening OP with the lid 210C.

[0042] Each of the plurality of partition wall portions 220 has a pair of resin layers 220R and a metal layer 220M (refer to Figure 4 ). The pair of resin layers 220R are juxtaposed 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 main body portion 210R. More specifically, the pair of resin layers 220R are integrally formed with both the bottom wall portion 211 and a pair of second wall portions 214 of the peripheral side wall portion 212.

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

[0044] It should be noted that each partition wall portion 220 and the lid 210C can be joined to each other by heat fusion, or they may not be.

[0045] Here, the resin compositions of the resin main body portion 210R, the lid resin layer of the lid 210C, and the resin layer 220R of the partition wall portion 220 that can form the present embodiment will be described.

[0046] The above resin composition may contain polycarbonate, polyethylene, polypropylene, polyethylene compounds, polyamide, polyester, polyphenylene sulfide (PPS), polyphenylene ether, polystyrene, polycycloolefin copolymer, acrylonitrile-butadiene-styrene copolymer, liquid crystal polymer (LCP), fluororesin, their mixtures, their alloys, or their copolymers as base polymers. The base polymer is not limited to this.

[0047] The above 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). High-density polyethylene, liquid crystal polymer, or fluororesin has a relatively low water vapor transmission rate. Therefore, the moisture resistance of the housing 200 including the resin main body portion 210R containing them is improved.

[0048] The liquid crystal polymer may contain a structural unit derived from an oligomer of hydroxybenzoic acid. The liquid crystal polymer may be a structure in which, in addition to the oligomer of hydroxybenzoic acid, it contains 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), and is copolymerized with the oligomer of hydroxybenzoic acid (HBA).

[0049] Examples of the fluororesin include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), or their mixtures or copolymers. The fluororesin has hydrophobicity. 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 the fluororesin. When the content of the fluororesin is within the above range, it is considered that the molded product made of this resin composition has the effect of blocking moisture from the surface of the molded product in contact with the external air.

[0050] In the present embodiment, the base polymers of the resin compositions constituting the lid 210C, the resin compositions of the pair of resin layers 220R constituting the resin main body portion 210R and the plurality of partition wall portions 220 are preferably of the same structure. Thus, these constituent members are easily welded to each other. Further, the welded portion 217 can be easily formed. From the viewpoint of performing hot welding, the base polymer is also preferably polyethylene or polypropylene.

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

[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 orthogonal to the first direction D1. Specifically, the metal layer 220M extends in both the second direction D2 and the third direction D3.

[0053] Here, details of the plurality of metal portions 210M disposed inside the resin main body portion 210R will be described. The plurality of metal portions 210M are respectively connected to the metal layer 220M of the partition wall portion 220 (see Figure 1 and Figure 2 etc.). The plurality of metal portions 210M are respectively exposed to the external space of the housing main body 210. The metal portions 210M and the metal layer 220M are made of a 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 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 respectively disposed inside the pair of second wall portions 214. The pair of side exposed portions 219 are respectively exposed from the pair of second wall portions 214.

[0056] Next, connection of the conductive member 310 and the external conductive member 320 will be 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. Moreover, 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 311A, a second end 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 connecting conductive member 310A, the first end 311A is the end on one side in the first direction D1 of the first connecting conductive member 310A, and is buried in the peripheral side wall portion 212 (one second wall portion 214) of the resin main body portion 210R. The second end 311B is the end on the other side in the first direction D1 of the first connecting conductive member 310A, and is buried in the peripheral side wall portion 212 (one second wall portion 214) of the resin main 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 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.

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

[0062] 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 housing main body 210 from the hole portion 215. 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 is provided in each connecting conductive member 310.

[0063] 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 housing body 210 from the other hole portion 215. 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 is provided in each connecting conductive member 310.

[0064] The first external conductive member 320A is juxtaposed 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 juxtaposed with 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 an embedded end portion 323.

[0066] 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.

[0067] In each external conductive member 320, the external connection surface portion 322 is exposed to the outside of the housing body 210 (resin main body portion 210R) in the first direction D1. The embedded end portion 323 is the end portion on the opposite side of the external connection surface portion 322 side in the first direction D1 and is embedded in the resin main body portion 210R.

[0068] 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 housing body 210 (resin main body portion 210R) from one of the plurality of hole portions 215. Another pressure relief valve 325 capable of releasing the pressure on the third inner surface portion 321 side to the third outer surface portion 324 side is provided in each external conductive member 320.

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

[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 disposed between the positive electrode tabs 112p of the respective electrode bodies 100 and the connection conductive member 310 or the external conductive member 320, and between the negative electrode tabs 122n of the respective electrode bodies 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.

[0071] The plurality of current collecting members 400 may contain a metal material such as aluminum or copper, for example. 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 power storage module 1 according to an embodiment of the present disclosure includes a plurality of electrode bodies 100 and a housing 200. The plurality of electrode bodies 100 are arranged in parallel along the first direction D1. The housing 200 houses the plurality of electrode bodies 100. The housing 200 has a housing main body 210 and at least one partition wall portion 220. The housing main body 210 surrounds the plurality of electrode bodies 100. The partition wall portion 220 is located between the plurality of adjacent electrode bodies 100 and defines the accommodation space S of the housing main 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 housing main body 210 and are arranged in parallel with each other along the first direction D1. The metal layer 220M is disposed between the pair of resin layers 220R and extends along a direction orthogonal to the first direction D1.

[0073] According to the above structure, the heat generated by the heat generation of the electrode body 100 disposed on one side of the defined accommodation space S can be suppressed from being transferred to the other side of the accommodation space S through 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 housing main body 210.

[0074] In addition, in the present embodiment, the housing main body 210 has a resin main body portion 210R and a metal portion 210M. The resin main body portion 210R is integrally formed with the partition wall portion 220. The metal portion 210M is disposed inside the resin main body portion 210R, is connected to the metal layer 220M, and is exposed to the external space of the housing main 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 housing main body 210 via the metal part 210M.

[0076] In addition, in the present embodiment, the metal part 210M includes a bottom exposed part 218. The bottom exposed part 218 is disposed inside the bottom wall part 211 and exposed from the bottom wall part 211.

[0077] According to the above structure, the heat transferred to the metal layer 220M is more easily discharged to the outside of the housing main body 210 via the bottom exposed part 218.

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

[0079] According to the above structure, the heat transferred to the metal layer 220M is more easily discharged to the outside of the housing main body 210 via the side exposed part 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 respects and not restrictive. The scope of the present invention is defined by the claims and includes all modifications within the meaning and scope equivalent to the claims.

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.

Images