Power storage module

Abstract

The invention provides a power storage module. In a power storage module, a case has a case 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. A first section and a second section adjacent to the first section via a partition wall portion are formed in the housing space of the housing main body by the partition wall portion. A first cooling path extending inside a portion facing the first section without passing through the second section and a second cooling path extending inside a portion facing the second section without passing through the first section are formed in the housing.

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 efficiently cooling a plurality of electrode bodies housed in respective sections.

[0005] The storage module based on the present disclosure includes 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. In the accommodation space of the shell body, a first section and a second section are formed by the partition wall portion, and the second section is adjacent to the first section across the partition wall portion. A first cooling path and a second cooling path are formed in the shell, the first cooling path does not pass through the second section but extends inside the portion facing the first section, and the second cooling path does not pass through the first section but extends inside the portion facing the second section.

[0006] According to the above configuration, the plurality of electrode bodies housed in each of the first segment and the second segment can be efficiently cooled by the first cooling path and the second cooling path. 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 Observe along the arrow direction of line VII-VII Figure 6 A cross-sectional view of a power storage module. 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 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.

[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 in the second direction D2 (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 second direction D2.

[0023] Each negative electrode 120 is formed in a rectangular shape that is long in the second direction D2. 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 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 connected to 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 along 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 along the first direction D1. It should be noted that the pair of second wall portions 214 may not be integrally formed with the bottom wall portion 211 and the pair of first wall portions 213.

[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 the present embodiment, the case 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.

[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] It should be noted that, when the pair of second wall portions 214 are not integrally formed with other parts as described above, the cover 216 may be integrally formed with the pair of second wall portions 214 and the partition wall portion 220 described later.

[0042] 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 electrode bodies 100 adjacent to each other to define the accommodation 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.

[0043] 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.

[0044] The housing 200 is also provided with a plurality of first cooling paths 500, a plurality of second cooling paths 600, and a plurality of third cooling paths 700. These cooling paths are configured to allow a cooling medium to flow therein. The cooling medium may be a liquid or a gas such as air. A system having the power storage module 1 of this embodiment may further include a cooler. The cooler may cool the cooling medium flowing in these cooling paths. The above system may be a battery cooling system provided in a vehicle.

[0045] The plurality of first cooling paths 500 extend inside the portion facing the first segment S1 without passing through the second segment S2. Specifically, the portion is a portion facing the first segment S1 without passing through other segments (the second segment S2 and the third segment S3) other than the first segment S1. Each first cooling path 500 extends along the second direction D2. Each first cooling path 500 extends from one side of the housing 200 to the other side. Each first cooling path 500 is a through hole. Each first cooling path 500 has an opening on one side and the other side of the housing 200.

[0046] In this embodiment, specifically, the first cooling path 500 is provided in the housing body 210. The first cooling path 500 is parallel to the first section S1 in the third direction D3. More specifically, in the first direction D1 and the third direction D3, the first cooling path 500 is located inside the bottom wall portion 211. The first cooling path 500 has openings on one side and the other side of the bottom wall portion 211 in the second direction D2, respectively.

[0047] The plurality of second cooling paths 600 extend inside the portion facing the second segment S2 without passing through the first segment S1. Specifically, the portion is a portion facing the second segment S2 without passing through other segments (the first segment S1 and the third segment S3) other than the second segment S2. Each second cooling path 600 extends along the second direction D2. Each second cooling path 600 extends from one side of the housing 200 to the other side. Each second cooling path 600 is a through hole. Each second cooling path 600 has an opening on one side and the other side of the housing 200.

[0048] In this embodiment, specifically, the second cooling path 600 is provided in the housing body 210. The second cooling path 600 is parallel to the second section S2 in the third direction D3. More specifically, in the first direction D1 and the third direction D3, the second cooling path 600 is located inside the bottom wall portion 211. The second cooling path 600 has openings on one side and the other side of the bottom wall portion 211 in the second direction D2.

[0049] The third cooling path 700 does not pass through other segments (the first segment S1 and the second segment S2) other than the third segment S3, but extends inside the portion facing the third segment S3. In this embodiment, the third cooling path 700 is parallel to the third segment S3 in the third direction D3. In addition to these structures, the third cooling path 700 may have the same structure as the first cooling path 500 or the same structure as the second cooling path 600.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 composition. 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.

[0059] 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.

[0060] It should be noted that the bottom wall portion 211, the peripheral side wall portion 212, the cover 216 and the plurality of partition wall portions 220 may be made of metal. In this case, it is preferred that an insulating material be coated on the portion facing the accommodation space S. Moreover, in this case, it is also preferred that an insulating member be disposed between the peripheral side wall portion 212 and the connecting conductive member 310 and the external conductive member 320.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Each external conductive member 320 has a third inner surface portion 321 , an external connection surface portion 322 , and a buried end portion 323 .

[0071] 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.

[0072] 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 .

[0073] 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.

[0074] Each connection conductive member 310 and each external conductive member 320 are made of metal such as stainless steel, aluminum, or copper.

[0075] 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.

[0076] 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.

[0077] As described above, the storage module 1 of the first 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. In the accommodation space S of the shell body 210, the partition wall portion 220 forms a first section S1 and a second section S2 adjacent to the first section S1 across the partition wall portion 220. The shell 200 is formed with: a first cooling path 500 extending inside a portion facing the first section S1 without passing through the second section S2; and a second cooling path 600 extending inside a portion facing the second section S2 without passing through the first section S1.

[0078] According to the above structure, the plurality of electrode bodies 100 housed in each of the first section S1 and the second section S2 can be efficiently cooled by the first cooling path 500 and the second cooling path 600. Furthermore, since the first cooling path 500 and the second cooling path 600 are formed inside the housing 200, the number of components of the power storage module 1 can be reduced.

[0079] In this embodiment, the first cooling path 500 and the second cooling path 600 are provided in the housing body 210. Thus, the first cooling path 500 and the second cooling path 600 are provided in the housing body 210 relatively close to the external space of the housing 200, thereby making it easier to manage the state of each cooling path.

[0080] (Implementation Method 2)

[0081] The following describes a storage module according to a second embodiment of the present disclosure. In the storage module according to the second embodiment of the present disclosure, the portion in which each cooling path is formed is different from that in the storage module according to the first embodiment of the present disclosure. Therefore, in the storage module according to the second embodiment of the present disclosure, the same structure and effects as those in the first embodiment will not be described repeatedly.

[0082] Figure 6 This is an exploded perspective view of a power storage module according to Embodiment 2 with part of the module exploded. Figure 7 Observe along the arrow direction of line VII-VII Figure 6 A cross-sectional view of a power storage module.

[0083] like Figure 6 and Figure 7As shown, in the power storage module 1a according to the second embodiment of the present disclosure, the first cooling path 500a and the second cooling path 600a are integrally formed inside the partition wall portion 220 (first partition wall portion 220A) that defines the first section S1 and the second section S2.

[0084] According to the above structure, even if one of the first electrode body 100A accommodated in the first segment S1 and the second electrode body 100B accommodated in the second segment S2 is overheated, the cooling path formed in the partition wall portion 220 can further suppress the transfer of heat generated by the above-mentioned excessive heating to the other electrode body.

[0085] Specifically, one cooling path formed inside the first partition wall portion 220A also functions as either the first cooling path 500a or the second cooling path 600a. For simplicity, the following description will refer to this one cooling path as the second cooling path 600a.

[0086] In the present embodiment, the second cooling path 600a is parallel to the second section S2 and the first section S1 in the first direction D1. Specifically, in the first direction D1 and the third direction D3, the second cooling path 600a is located inside the first partition wall portion 220A. The second cooling path 600a has openings on one side and the other side of the first partition wall portion 220A in the second direction D2. A plurality of first holes 218a are formed in a pair of second wall portions 214a in a manner corresponding to these openings. These first holes 218a respectively connect the second cooling path 600a with the external space of the housing 200.

[0087] In addition, the first cooling path 500a is also formed inside the second partition wall portion 220B. Specifically, the first cooling path 500a and the third cooling path 700a are integrally formed inside the second partition wall portion 220B.

[0088] Specifically, one cooling path formed inside the second partition wall portion 220B also functions as either the first cooling path 500a or the third cooling path 700a. For simplicity, the following description will refer to this one cooling path as the third cooling path 700a.

[0089] In the present embodiment, the third cooling path 700a is parallel to the third section S3 and the first section S1 in the first direction D1. Specifically, in the first direction D1 and the third direction D3, the third cooling path 700a is located inside the second partition wall portion 220B. The third cooling path 700a has openings on one side and the other side of the second partition wall portion 220B in the second direction D2. A plurality of second holes 219a corresponding to these openings are formed in a pair of second wall portions 214a. These second holes 219a respectively connect the third cooling path 700a with the external space of the housing 200.

[0090] Although the embodiments of the present disclosure 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 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, 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 via the partition wall. The housing includes a first cooling path and a second cooling path. The first cooling path extends inside a portion facing the first segment without passing through the second segment. The second cooling path extends inside a portion facing the second segment without passing through the first segment.

2. The power storage module according to claim 1, wherein: The first cooling path and the second cooling path are provided in the housing body.

3. The power storage module according to claim 1, wherein: The first cooling path and the second cooling path are integrally formed inside the partition wall portion that defines the first section and the second section.

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