Power storage module

Abstract

The utility model provides an electric 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 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 respectively 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] The present disclosure is made in view of the above problems, and an object thereof is to provide a power storage module capable of efficiently cooling a plurality of electrode bodies respectively housed in each section.

[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 a plurality of adjacent electrode bodies to define a housing space of the housing main body. In the housing space of the housing main 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 with the partition wall portion therebetween. A first cooling path and a second cooling path are formed in the housing. The first cooling path extends inside a portion facing the first section without passing through the second section, and the second cooling path extends inside a portion facing the second section without passing through the first section.

[0006] According to the above structure, the plurality of electrode bodies respectively housed in each of the first section and the second section can be efficiently cooled by the first cooling path and the second cooling path. Brief Description of the Drawings

[0007] The above and other objects, features, aspects and advantages of the present utility model will become clearly understood from the following detailed description of the present utility model related to in association with the drawings.

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

[0009] Figure 2This is an exploded perspective view of the power storage module of Embodiment 1 with partial disassembly.

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

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

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

[0013] Figure 6 This is an exploded perspective view of the power storage module of Embodiment 2 with partial disassembly.

[0014] Figure 7 This is a cross-sectional view of the power storage module Figure 6 viewed in the direction of the arrow along line VII-VII. Specific Embodiments

[0015] 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, the same or equivalent components are labeled with the same reference numerals.

[0016] (Embodiment 1)

[0017] Figure 1 This is a perspective view showing the power storage module of Embodiment 1. Figure 2 This is an exploded perspective view of the power storage module of Embodiment 1 with partial disassembly. Figure 3 This is a cross-sectional view of the power storage module Figure 1 viewed in the direction of the arrow along line III-III. Figure 4 This is a cross-sectional view of the power storage module Figure 1 viewed in the direction of the arrow along line IV-IV.

[0018] As Figures 1 to 4 shown, the power storage module 1 of Embodiment 1 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 the 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 the second direction D2 and electrically connects the plurality of adjacent electrode bodies 100 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 in a state 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.

[0026] 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 formed of a rectangular region.

[0027] 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. In the present embodiment, the upper folding portion 132b is disposed above the positive electrode 110.

[0028] Each lower folding portion 132c connects the lower end portion of the above one sandwiching portion 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. 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.

[0029] 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 second direction D2. 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 directly connected to the housing 200.

[0030] As Figures 1 to 4 shown, the housing 200 has a housing main body 210 and at least one partition wall portion 220.

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

[0032] The housing main body 210 has a bottom wall portion 211, a peripheral side wall portion 212, a hole portion 215, a lid 216, and a welding portion 217.

[0033] The bottom wall portion 211 is made of a resin composition. In the housing main 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 outer 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 stands up from the peripheral edge of the bottom wall portion 211 in the third direction D3 to form an opening OP facing the opposite side of 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 portion 215 is provided to expose a part of the connecting conductive member 310 to the outside of the housing main body 210. 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.

[0037] In the present embodiment, the housing main body 210 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.

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

[0039] The lid 216 may be a laminate including a resin layer made of the resin composition and a barrier layer. Specifically, the lid 216 may be a laminated film in which a barrier layer made of aluminum or the like is laminated on the resin layer. The lid 216 may be a plate-like member in which a metal plate such as aluminum is laminated on the resin layer. The barrier layer or the metal plate may be disposed 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 the present embodiment, specifically, the first cooling path 500 is provided in the housing main body 210. The first cooling path 500 is juxtaposed with 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 in the second direction D2 of the bottom wall portion 211, respectively.

[0047] The plurality of second cooling paths 600 respectively extend inside the portion facing the second section S2 without passing through the first section S1. Specifically, this portion is the portion facing the second section S2 without passing through other sections (the first section S1 and the third section S3) other than the second section 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 openings on one side and the other side of the housing 200, respectively.

[0048] In the present embodiment, specifically, the second cooling path 600 is provided in the housing main body 210. The second cooling path 600 is juxtaposed with 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 in the second direction D2 of the bottom wall portion 211, respectively.

[0049] The third cooling path 700 extends inside the portion facing the third section S3 without passing through other sections (the first section S1 and the second section S2) other than the third section S3. In the present embodiment, the third cooling path 700 is juxtaposed with the third section 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 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 216.

[0051] The plurality of partition wall portions 220 are made of a resin composition and are integrally formed with the bottom wall portion 211 and the peripheral side wall portion 212. In the present embodiment, the plurality of partition wall portions 220 and the lid 216 may be joined to each other by heat fusion or may not be joined.

[0052] It should be noted that, in the present embodiment, as the above-mentioned "integrally formed" method, methods such as injection molding and other known methods for simultaneously forming and joining each constituent part in one step, or methods of joining each other by known joining methods such as welding, soldering or bonding after separately forming a plurality of constituent parts can be cited, etc.

[0053] Here, a resin composition capable of forming the bottom wall portion 211, the peripheral side wall portion 212, the lid 216 and the plurality of partition wall portions 220 in the present embodiment will be described.

[0054] The above resin composition may contain polycarbonate, polyethylene, polypropylene, polyethylene compounds, polyamides, polyesters, polyphenylene sulfide (PPS), polyphenylene ether, polystyrene, polycyclic olefin copolymers, acrylonitrile-butadiene-styrene copolymers, liquid crystal polymers (LCP), fluorine-based resins, mixtures thereof, alloys thereof, or copolymers thereof as the base polymer. The base polymer is not limited thereto.

[0055] The above resin composition may contain polyolefin, liquid crystal polymer, or fluorine-based resin as the base polymer. The polyolefin may contain high density polyethylene (HDPE: High Density Polyethylene). High density polyethylene, liquid crystal polymer, or fluorine-based resin has a relatively low water vapor transmission rate. Therefore, the moisture permeability resistance of the housing 200 containing the resin composition containing them is improved.

[0056] 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, 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) are copolymerized with the oligomer of hydroxybenzoic acid (HBA).

[0057] Examples of the fluororesin include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), or a mixture or copolymer thereof. The fluororesin has hydrophobicity. Therefore, based on the total weight of the resin composition, the resin composition may contain, for example, 20% by weight or less, 15% by weight or less, 10% by weight or less, 3% to 10% by weight, or 5% to 10% by weight of the fluororesin. When the content of the fluororesin is within the above range, it is considered that the molded article formed of the resin composition has the effect of blocking moisture from the surface of the molded article in contact with the external air.

[0058] In the present embodiment, the base polymers of the resin compositions constituting the lid 216 and the resin compositions constituting the peripheral side wall portion 212 and the plurality of partition wall portions 220 are preferably of the same constitution. Thereby, these constituent members are easily welded to each other. Further, the welded portion 217 can be easily formed. From the viewpoint of performing heat welding, the base polymer is also preferably polyethylene or polypropylene.

[0059] From the viewpoint of suppressing the water vapor transmission rate, the above resin composition may further contain an inorganic hygroscopic agent and graphite. Moreover, in addition to graphite, the above resin composition may further contain known substances as existing moisture barrier substances.

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

[0061] Next, the connecting 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 connecting conductive members 310. The plurality of connecting conductive members 310 include a first connecting conductive member 310A and a second connecting conductive member 310B. The plurality of connecting conductive members 310 may include three or more connecting conductive members. 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.

[0062] The connecting conductive member 310 (the first connecting conductive member 310A, 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 connecting conductive member 310A, the first end portion 311A is an end portion 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 housing main body 210. The second end portion 311B is an end portion 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 housing main body 210.

[0064] 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.

[0065] In the second connecting conductive member 310B, the first end portion 311A is an end portion 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 housing main body 210. The second end portion 311B is an end portion 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 housing main body 210.

[0066] 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.

[0067] 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.

[0068] 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 main 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.

[0069] The first external conductive member 320A is juxtaposed with 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 juxtaposed with 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 an embedded end portion 323.

[0071] In the first external conductive member 320A, the third inner surface portion 321 is exposed to the accommodation space S (the third section S3) and is electrically connected to the electrode tab (the 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 (the second section S2) and is electrically connected to the electrode tab (the negative electrode 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 main body 210 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 in the first direction D1 and is embedded in the housing main body 210.

[0073] 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 main body 210 through one of the plurality of hole portions 215. In each external conductive member 320, another pressure relief valve 325 is provided that can release the pressure on the third inner surface portion 321 side to the third outer surface portion 324 side.

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

[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 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.

[0076] 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.

[0077] As described above, the power storage module 1 according to Embodiment 1 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. In the accommodation space S of the housing main body 210, a first section S1 and a second section S2 adjacent to the first section S1 with the partition wall portion 220 interposed therebetween are formed by the partition wall portion 220. In the housing 200, 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 are formed.

[0078] According to the above structure, the plurality of electrode bodies 100 accommodated 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. Moreover, 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 addition, in the present embodiment, the first cooling path 500 and the second cooling path 600 are provided in the housing main body 210. Thus, the first cooling path 500 and the second cooling path 600 are provided in the housing main body 210 that is relatively close to the external space of the housing 200, whereby the management of the states of the respective cooling paths becomes relatively easy.

[0080] (Embodiment 2)

[0081] Hereinafter, the power storage module according to Embodiment 2 of the present disclosure will be described. In the power storage module according to Embodiment 2 of the present disclosure, the portions forming the respective cooling paths are different from those of the power storage module according to Embodiment 1 of the present disclosure. Therefore, in the power storage module according to Embodiment 2 of the present disclosure, the same structures and effects as those in Embodiment 1 will not be repeatedly described.

[0082] Figure 6 is an exploded perspective view of the power storage module according to Embodiment 2 with partial decomposition. Figure 7 is a cross-sectional view of the power storage module viewed in the arrow direction along line VII-VII Figure 6 of.

[0083] As Figure 6 and Figure 7As shown, in the power storage module 1a of Embodiment 2 of the present disclosure, the first cooling path 500a and the second cooling path 600a are integrally formed inside a partition wall portion 220 (first partition wall portion 220A) that defines a first section S1 and a second section S2.

[0084] According to the above structure, even when one of the first electrode body 100A accommodated in the first section S1 and the second electrode body 100B accommodated in the second section S2 overheats, heat generated by the overheating can be further suppressed from being transferred to the other electrode body through the cooling path formed in the partition wall portion 220.

[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, hereinafter, this one cooling path will be described as the second cooling path 600a.

[0086] In the present embodiment, the second cooling path 600a is juxtaposed with 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 in the second direction D2 of the first partition wall portion 220A. A plurality of first hole portions 218a are formed in a pair of second wall portions 214a corresponding to these openings. These first hole portions 218a respectively communicate 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, hereinafter, this one cooling path will be described as the third cooling path 700a.

[0089] In the present embodiment, the third cooling passage 700a is juxtaposed with 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 passage 700a is located inside the second partition wall portion 220B. The third cooling passage 700a has openings on one side and the other side in the second direction D2 of the second partition wall portion 220B. A plurality of second hole portions 219a corresponding to these openings are formed in the pair of second wall portions 214a. These second hole portions 219a respectively communicate the third cooling passage 700a with the external space of the housing 200.

[0090] Although embodiments of the present disclosure have been described, it should be considered that the embodiments disclosed this time are illustrative in all respects and are not limited. The scope of the present utility model is disclosed by the claims and includes all changes 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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