Power storage module

Abstract

The invention provides a power storage module. In the power storage module, a first section and a second section adjacent to the first section via a partition wall portion are formed in a housing space of a case main body by the partition wall portion. The first end portion is an end portion connected to one side of the conductive member in the first direction, and is embedded in the housing main body. The second end portion is an end portion connected to the other side of the conductive member in the first direction, and is embedded in the housing main body. The first inner surface portion is exposed to the first section and is electrically connected to a first electrode body housed in the first section among the plurality of electrode bodies. The second inner surface portion is exposed to the second section and is electrically connected to a second electrode body housed in the second section among the plurality of electrode bodies.

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 Gazette No. 2019-106372, the lower wall is integrated with multiple (for example, 3, 4 or more) side walls to form a space inside, with 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 receiving portion includes a plurality of battery section portions separated by one or more partition walls arranged in the space. Electrode assemblies can be accommodated separately in each battery section portion. Moreover, the above-mentioned battery case also includes a cover portion for sealing the open surface of the receiving portion. The cover portion may have a positive terminal and a negative terminal. Summary of the invention

[0003] As disclosed in Japanese Patent Application Publication No. 2019-106372, when multiple battery segments each accommodate an electrode assembly, the terminals protruding from the cover are connected to each other by a connecting member such as a bus bar. The connecting member is arranged outside the case, thereby increasing the size of the storage module.

[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 compact power storage module.

[0005] The storage module based on the present disclosure includes a plurality of electrode bodies, a shell and at least one connecting conductive member. The plurality of electrode bodies are arranged along a first direction. The shell accommodates the plurality of electrode bodies. The connecting conductive member is arranged in parallel with the plurality of electrode bodies in a second direction, and electrically connects the plurality of electrode bodies adjacent to each other. The second direction is orthogonal to the first direction. The shell has a shell body and at least one partition wall portion. The shell body is electrically insulating and surrounds the plurality of electrode bodies. The partition wall portion is electrically insulating and is located between the plurality of electrode bodies adjacent to each other to divide the accommodation space of the shell body. In the accommodation space of the shell body, a first section and a second section adjacent to the first section separated by the partition wall portion are formed by the partition wall portion. The connecting conductive member has a first end, a second end, a first inner surface portion and a second inner surface portion. The first end is an end on one side of the connecting conductive member in the first direction, and is buried in the shell body. The second end is an end on the other side of the connecting conductive member in the first direction, and is buried in the shell body. The first inner surface portion is exposed to the first section, and is electrically connected to the first electrode body accommodated in the first section among the plurality of electrode bodies. The second inner surface portion is exposed toward the second section and is electrically connected to a second electrode body among the plurality of electrode bodies housed in the second section.

[0006] According to the above configuration, the connecting conductive member electrically connects the first electrode body and the second electrode body and is at least partially buried in the case body in the first direction. Therefore, the power storage module can be miniaturized. 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 the power storage module according to the first embodiment.

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

[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.

[0013] Figure 6 This is an exploded perspective view of a power storage module according to Embodiment 2 with part of the module exploded.

[0014] Figure 7 This is an exploded perspective view of a power storage module according to Embodiment 3 with part of the module exploded. DETAILED DESCRIPTION

[0015] 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.

[0016] (Implementation Method 1)

[0017] Figure 1 It is a perspective view showing the power storage module according to the first embodiment. Figure 2 This is an exploded perspective view of a part of the power storage module according to the first embodiment. 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.

[0018] like Figure 1~Figure 4 As shown, the storage module 1 of the first 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 second direction D2, and electrically connects the plurality of electrode bodies 100 adjacent to each other. The second direction D2 is orthogonal to the first direction D1.

[0019] 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 observed 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.

[0020] 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.

[0021] 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.

[0022] Each positive electrode 110 is formed into a rectangular shape that is long in the second direction D2. Each positive electrode 110 includes 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 includes a positive electrode tab 112p (see Figure 3 and Figure 4 ). The positive electrode tab 112p protrudes toward one side in the second direction D2.

[0023] Each negative electrode 120 is formed into a rectangular shape that is long in the second direction D2. Each negative electrode 120 includes a negative electrode collector foil 122 and a negative electrode active material layer 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 Figure 3 and Figure 4 ). The negative electrode tab 122n protrudes toward the other side in the second direction D2.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 second direction D2, 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 along 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 , 120 and the separator 130 may be directly in contact with the housing 200 .

[0030] like Figure 1~Figure 4 As shown, the housing 200 includes a housing body 210 and at least one partition wall portion 220 .

[0031] The case body 210 has electrical insulation at least on the surface facing the electrode bodies 100 . The case body 210 surrounds the plurality of electrode bodies 100 .

[0032] The case body 210 includes a bottom wall portion 211 , a peripheral side wall portion 212 , a hole portion 215 , a cover 216 , and a weld portion 217 .

[0033] The bottom wall portion 211 is made of a resin composition. In the housing body 210, the bottom wall portion 211 is located on one side in the third direction D3. The third direction D3 is orthogonal to both the first direction D1 and the second direction D2. The bottom wall portion 211 extends along the first direction D1 and the second direction D2. When viewed from the third direction D3, the bottom wall portion 211 has a rectangular shape.

[0034] The peripheral side wall portion 212 is made of a resin composition and is integrally formed with the bottom wall portion 211. The peripheral side wall portion 212 rises from the peripheral end of the bottom wall portion 211 in the third direction D3 and forms an opening OP facing the side opposite to the bottom wall portion 211 side.

[0035] 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 in the second direction D2. The pair of second wall portions 214 are arranged in parallel along the second direction D2. The pair of second wall portions 214 extend in the first direction D1.

[0036] The hole 215 is provided to expose a part of the connection conductive member 310 to the outside of the housing body 210. The hole 215 is closed by the connection conductive member 310. Specifically, the hole 215 is provided in the peripheral side wall portion 212, more specifically, in the second wall portion 214.

[0037] In this embodiment, the housing body 210 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. Moreover, in this embodiment, the connecting conductive member 310 is exposed from two holes 215. These holes 215 may be provided continuously with each other.

[0038] The cover 216 closes the opening OP. In the present embodiment, at least a portion of the cover 216 facing the peripheral side wall portion 212 is made of a resin composition. The cover 216 has a flat plate or film-like outer shape.

[0039] The cover 216 may be a laminate including a resin layer and a barrier layer composed of the resin composition. Specifically, the cover 216 may be a laminated film in which a barrier layer composed of aluminum or the like is laminated on the resin layer. The cover 216 may be a plate-shaped member in which a metal plate such as aluminum is laminated on the resin layer. The barrier layer or the metal plate may be arranged inside the resin layer.

[0040] The welded portion 217 is formed by thermally welding the cover 216 and the peripheral side wall portion 212. Instead of forming the welded portion 217, the cover 216 and the peripheral side wall portion 212 may be joined to each other by other known joining methods such as adhesives.

[0041] The partition wall portion 220 has at least electrical insulation on the surface facing the electrode body 100. The partition wall portion 220 is located between a plurality of adjacent electrode bodies 100 to divide the storage space S of the shell body 210. The shell 200 of this embodiment has a plurality of partition wall portions 220. The plurality of partition wall portions 220 include a first partition wall portion 220A and a second partition wall portion 220B. The plurality of partition wall portions 220 may include three or more partition wall portions.

[0042] 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.

[0043] 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. The method of injecting the electrolyte is not particularly limited. The electrolyte can be injected from the opening OP before the opening OP is closed by the cover 216.

[0044] The plurality of partition walls 220 are made of a resin composition and are integrally formed with the bottom wall 211 and the peripheral side wall 212. In the present embodiment, the plurality of partition walls 220 and the cover 216 may be joined to each other by thermal fusion or may not be joined to each other.

[0045] 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, welding or bonding.

[0046] Here, the resin composition that can constitute the bottom wall portion 211 , the peripheral side wall portion 212 , the cover 216 , and the plurality of partition wall portions 220 in the present embodiment will be described.

[0047] 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.

[0048] 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 composition containing them has improved moisture permeability resistance.

[0049] 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.

[0050] 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.

[0051] In this embodiment, the base polymer of the resin composition constituting the cover 216 and the base polymer of the resin composition constituting the peripheral side wall portion 212 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 perspective of thermal welding, the base polymer is also preferably polyethylene or polypropylene.

[0052] 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 an existing moisture barrier substance in addition to graphite.

[0053] 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.

[0054] 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.

[0055] 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 (one second wall portion 214) of the housing body 210. The second end portion 311B is an end portion on the other side of the first connection conductive member 310A in the first direction D1, and is buried in the peripheral side wall portion 212 (one second wall portion 214) of the housing body 210.

[0056] 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.

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

[0058] In the second connection 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.

[0059] 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.

[0060] 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.

[0061] The first external conductive member 320A is parallel to the third electrode body 100C in the second direction D2 and is electrically connected to the third electrode body 100C. The second external conductive member 320B is parallel to the second electrode body 100B in the second direction D2 and is electrically connected to the second electrode body 100B.

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

[0063] In the first external conductive member 320A, the third inner surface portion 321 is exposed to the receiving 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 receiving space S (second section S2) and is electrically connected to the electrode tab (negative 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 housing body 210 in the first direction D1 . The buried end portion 323 is an end portion on the opposite side to the external connection surface portion 322 in the first direction D1 and is buried in the housing body 210 .

[0065] 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 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.

[0066] Each of the connecting conductive members 310 and each of the external conductive members 320 is made of metal such as stainless steel, aluminum, or copper. In addition, the method of partially burying each of the connecting conductive members 310 and each of the external conductive members 320 in the peripheral side wall portion 212 (second wall portion 214) of the housing body 210 is not particularly limited. For example, the resin composition that is the material of the peripheral side wall portion 212 (second wall portion 214) of the housing body 210 can be injection molded so as to cover a portion of each of the connecting conductive members 310 and each of the external conductive members 320.

[0067] 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, the second inner surface portion 312B or the third inner surface portion 321 by welding.

[0068] 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.

[0069] As described above, the power storage module 1 of the first embodiment of the present disclosure includes a plurality of electrode bodies 100, a case 200, and at least one connecting conductive member 310. The connecting conductive member 310 includes a first end 311A, a second end 311B, a first inner surface portion 312A, and a second inner surface portion 312B. The first end 311A ​​is an end on one side of the connecting conductive member 310 in the first direction D1, and is buried in the case body 210. The second end 311B is an end on the other side of the connecting conductive member 310 in the first direction D1, and is buried in the case body 210. The first inner surface portion 312A is exposed to the first section S1, and is electrically connected to the first electrode body 100A accommodated in the first section S1 among the plurality of electrode bodies 100. The second inner surface portion 312B is exposed to the second section S2, and is electrically connected to the second electrode body 100B accommodated in the second section S2 among the plurality of electrode bodies 100.

[0070] According to the above configuration, the connecting conductive member 310 electrically connects the first electrode body 100A and the second electrode body 100B, and is at least partially buried in the case body 210 in the first direction D1. Therefore, the power storage module 1 can be miniaturized.

[0071] In the first embodiment of the present disclosure, the housing body 210 has a hole 215 provided to expose a part of the connection conductive member 310 to the outside of the housing body 210 and blocked by the connection conductive member 310. The connection conductive member 310 also has a first outer surface portion 313A located on the opposite side of the first inner surface portion 312A and exposed to the outside of the housing body 210 from the hole 215. The 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.

[0072] According to the above configuration, since the pressure relief valve 314 is provided on the connection conductive member 310 , the safety of the power storage module 1 can be further improved. In addition, the pressure relief valve can be provided on the power storage module 1 more easily than when the pressure relief valve is provided on the case body 210 having electrical insulation.

[0073] In addition, the storage module 1 of the first embodiment of the present disclosure further includes an external conductive member 320. The external conductive member 320 is arranged in parallel with the third electrode body 100C, which is located closest to the end in the first direction D1 among the plurality of electrode bodies 100, in the second direction D2, and is electrically connected to the third electrode body 100C. The external conductive member 320 has a third inner surface portion 321, an external connection surface portion 322, and a buried end portion 323. The third inner surface portion 321 is exposed to the storage space S and is electrically connected to the third electrode body 100C. The external connection surface portion 322 is exposed to the outside of the shell body 210 in the first direction D1. The buried end portion 323 is an end portion on the opposite side of the external connection surface portion 322 side in the first direction D1, and is buried in the shell body 210.

[0074] According to the above structure, the external connection surface 322 facilitates connection with another conductive member (for example, an external connection surface of another storage module) in the first direction D1. In addition, since the external conductive member 320 is partially buried in the case body 210, the storage module 1 can be further miniaturized.

[0075] In addition, in the first embodiment of the present disclosure, the shell body 210 has a bottom wall portion 211, a peripheral side wall portion 212, a cover 216, and a welding portion 217. The bottom wall portion 211 is made of a resin composition and is located on one side in the third direction D3. The third direction D3 is orthogonal to both the first direction D1 and the second direction D2. The peripheral side wall portion 212 is made of a resin composition and is integrally formed with the bottom wall portion 211, rising from the peripheral end of the bottom wall portion 211 toward the third direction D3 to form an opening OP on the opposite side of the bottom wall portion 211. The cover 216 closes the opening OP, and at least the portion opposite to the peripheral side wall portion 212 is made of a resin composition. The welding portion 217 is formed by thermally welding the cover 216 and the peripheral side wall portion 212 to each other.

[0076] According to the above-mentioned structure, since both the case body 210 and the cover 216 are made of the resin composition, the welded portion 217 can be easily formed. Furthermore, the opening OP can be easily sealed.

[0077] (Implementation Method 2)

[0078] The following describes a storage module according to a second embodiment of the present disclosure. The storage module according to the second embodiment of the present disclosure is mainly different from the storage module according to the first embodiment of the present disclosure in terms of the structure of the cover. Therefore, in the storage module according to the second embodiment of the present disclosure, descriptions of the same structures and effects as those in the first embodiment are omitted.

[0079] Figure 6 FIG. 2 is an exploded perspective view of a power storage module according to Embodiment 2 that is partially exploded. Figure 6 As shown, in the second embodiment of the present disclosure, the cover 216a includes a cover body 218 and a gasket 219. The gasket 219 is sandwiched between the cover body 218 and the peripheral side wall 212a. Thus, the airtightness of the housing body 210 can be improved by a relatively simple method.

[0080] The cover body 218 may have the same structure as the cover 216 in Embodiment 1. From the viewpoint of improving rigidity, the cover body 218 is preferably a plate-like member including a metal plate. The gasket 219 may be a plate-like member or a linear member such as an O-ring. The gasket 219 may also be arranged between the cover body 218 and each partition wall portion 220. The portion of the peripheral side wall portion 212a that is in contact with the gasket 219 may have a shape along the outer shape of the gasket 219 (e.g., a groove-like outer shape).

[0081] The cover 216a may further include a plurality of fastening members 250. The fastening members 250 are, for example, bolts. The cover body 218 and the peripheral side wall 212a are fixed to each other by the plurality of fastening members 250.

[0082] (Implementation 3)

[0083] The following describes a storage module according to a third embodiment of the present disclosure. The storage module according to the third embodiment of the present disclosure is mainly different from the storage module according to the second embodiment of the present disclosure in the structure of the cover body. Therefore, in the storage module according to the third embodiment of the present disclosure, the description of the same structure and effects as those in the second embodiment is omitted.

[0084] Figure 7 FIG. 2 is an exploded perspective view of a power storage module according to Embodiment 3 that is partially exploded. Figure 7As shown, in this embodiment, the cover body 218b has a claw portion 260 provided along the peripheral end. The peripheral side wall portion 212b has a groove portion 270 provided along the outer surface of the peripheral side wall portion 212b. The cover body 218b is fixed by fitting the claw portion 260 into the groove portion 270. Moreover, in this embodiment, a weight formed of other components can be provided on the central portion of the cover body 218b. Thus, it is possible to suppress the central portion of the cover body 218b from being deformed with the fitting portion between the claw portion 260 and the groove portion 270 as a fulcrum.

[0085] 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; a housing for housing the plurality of electrode bodies; and at least one connecting conductive member is arranged in parallel with the plurality of electrode bodies in a second direction to electrically connect the plurality of electrode bodies adjacent to each other, the second direction being orthogonal to the first direction, The housing has: A shell body having electrical insulation properties and surrounding the plurality of electrode bodies; and at least one partition wall portion has electrical insulation properties and is located between the plurality of electrode bodies adjacent to each other to divide the housing space of the housing body. In the accommodation space of the housing body, a first section and a second section are formed by the partition wall, and the second section is adjacent to the first section across the partition wall. The connecting conductive member has a first end, a second end, a first inner surface portion and a second inner surface portion, The first end portion is an end portion on one side in the first direction connected to the conductive member and is buried in the housing body. The second end portion is an end portion on the other side in the first direction connected to the conductive member and is buried in the housing body. The first inner surface portion is exposed to the first section and is electrically connected to a first electrode body among the plurality of electrode bodies housed in the first section. The second inner surface portion is exposed toward the second section and is electrically connected to a second electrode body among the plurality of electrode bodies housed in the second section.

2. The power storage module according to claim 1, wherein: The housing body has a hole portion, which is provided to expose a part of the connecting conductive member to the outside of the housing body and is closed by the connecting conductive member. The connecting conductive member further includes a first outer surface portion, the first outer surface portion being located on the opposite side of the first inner surface portion and exposed from the hole portion to the outside of the housing body. The connecting conductive member is provided with a pressure relief valve capable of releasing the pressure on the first inner surface portion side toward the first outer surface portion side.

3. The power storage module according to claim 1, wherein: The power storage module further includes an external conductive member arranged in parallel with a third electrode body located closest to the end in the first direction among the plurality of electrode bodies in the second direction and electrically connected to the third electrode body. The external conductive member has a third inner surface portion, an external connection surface portion and a buried end portion, The third inner surface portion is exposed to the receiving space and is electrically connected to the third electrode body. The external connection surface is exposed to the outside of the housing body in the first direction, The buried end portion is an end portion on the opposite side to the external connection surface portion in the first direction, and is buried in the housing body.

4. The power storage module according to any one of claims 1 to 3, wherein: The housing body has: A bottom wall portion, made of a resin composition, located on one side in a third direction, the third direction being orthogonal to both the first direction and the second direction; A peripheral side wall portion, which is made of a resin composition and is integrally formed with the bottom wall portion, rises from a peripheral end of the bottom wall portion in the third direction to form an opening facing the side opposite to the bottom wall portion; a cover that closes the opening, wherein at least a portion facing the peripheral side wall portion is formed of a resin composition; and The welded portion is formed by thermally welding the cover and the peripheral side wall portion to each other.

5. The power storage module according to any one of claims 1 to 3, wherein: The housing body has: A bottom wall portion located on one side in a third direction, wherein the third direction is orthogonal to both the first direction and the second direction; A peripheral side wall portion, formed integrally with the bottom wall portion, rising from a peripheral end of the bottom wall portion toward the third direction to form an opening facing the side opposite to the bottom wall portion; and A cover is provided to close the opening, The cover has: Cover the main body; and A gasket is sandwiched between the cover body and the peripheral side wall.

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