JP2019114512A - Power storage device - Google Patents

Abstract

To provide a power storage device capable of restraining cooling efficiency decline.SOLUTION: A power storage device 10 includes a power storage module 12, and a refrigeration component 14. The power storage module 12 and the refrigeration component 14 are laminated so that the refrigeration component 14 is interposed between the power storage modules 12 in a first direction D1. Outer edge C of the power storage modules 12 is formed of a frame body 50. Wen viewing from the first direction D1, the outer edge C is located on the farther outside than the refrigeration component 14. A corner 17p of the outer edge C of a pair of power storage modules 12, facing each other along the first direction D1 while sandwiching the refrigeration component 14, is bevelled.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a power storage device.

  Patent Document 1 describes a bipolar battery. The bipolar battery comprises a battery element including a plurality of stacked bipolar electrodes. The bipolar electrode has a current collector, a positive electrode layer provided on one side of the current collector, and a negative electrode layer provided on the other side of the current collector. In addition, this bipolar battery is provided with a resin group that covers the outside of the battery element. The resin group is provided to keep the battery element airtight so that the electrolyte solution and the like inside the battery do not leak to the outside.

JP 2005-005163 A

  By the way, an electric storage device may be configured by laminating a plurality of the above-mentioned bipolar batteries while interposing a cooling member. In that case, the cooling efficiency is improved by exposing the cooling member from between the bipolar batteries as viewed in the direction crossing the stacking direction. On the other hand, when the bipolar battery is deformed due to bending or the like, the exposure of the cooling member may be inhibited and the cooling efficiency may be reduced because the outer edges of the deformed bipolar battery are close to each other.

  An object of the present invention is to provide a power storage device capable of suppressing a decrease in cooling efficiency.

  An electricity storage device according to the present invention comprises at least a pair of rectangular plate-like electricity storage modules including a plurality of bipolar electrodes stacked along a first direction, and a frame provided to hold the bipolar electrodes. And a cooling member for cooling the storage module, wherein the storage module and the cooling member are stacked such that the cooling member is interposed between the storage modules along the first direction, and the outer edge portion of the storage module is And an outer edge portion of the storage battery module, the outer edge portion being located outside the cooling member, viewed from the first direction, with the cooling member interposed therebetween along the first direction. The corners of are chamfered.

  In the storage device, the storage module and the cooling member are stacked such that the cooling member is interposed between the storage modules. Each of the storage modules includes a frame that holds the bipolar electrode and forms an outer edge. And the corner part of the outer edge part of a pair of electrical storage module which mutually opposes on both sides of a cooling member along the lamination direction (1st direction) is chamfered. For this reason, even in the case where the storage module is deformed such as by bending, proximity of the outer edge portions can be avoided by the amount of chamfering of the corner portions. Thereby, the inhibition of the exposure of the cooling member is suppressed, and the decrease in the cooling efficiency is suppressed.

  In the power storage device according to the present invention, the cooling member has a pair of end faces in the second direction intersecting the first direction, and the cooling member extends in the second direction and is open in each of the pair of end faces At the same time, a refrigerant flow path for circulating the refrigerant may be formed along the second direction, and the corner in the second direction of the outer edge may be chamfered. Thus, by providing the refrigerant flow path to the cooling member, it is possible to cool the storage module more effectively. In this case, in particular, the opening of the coolant channel is formed on the end face of the cooling member in the second direction, and the corner in the same direction of the storage module is chamfered. For this reason, the exposure of the opening of the refrigerant flow path is less likely to be inhibited, and the decrease in the cooling efficiency is reliably suppressed.

  In the power storage device according to the present invention, the power storage module connects the first surface along the first direction, the second surface intersecting the first direction and facing the cooling member, and the first surface and the second surface. And the third surface forming the corner portion, and the corner portion is connected to the second surface in the first direction from the first position, which is a connection position between the first surface and the third surface in the first direction. The storage module may be chamfered by a third surface formed so as to shrink toward the second position, which is a connection position with the third surface. In this case, for example, when the frame is manufactured by injection molding of resin, generation of an undercut can be achieved if the dividing surfaces of the upper and lower molds are arranged at a position closer to the center than the first position of the storage module. The frame can be easily manufactured while suppressing.

  In the power storage device according to the present invention, the distance between the first position and the second position may be 1/2 or more of the thickness of the cooling member in the first direction. In this case, the inhibition of the exposure of the cooling member can be suppressed more reliably.

  According to the present invention, it is possible to provide a power storage device capable of suppressing a decrease in cooling efficiency.

It is a perspective view showing an electricity storage device concerning this embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. It is sectional drawing along the II-II line of FIG. It is sectional drawing which shows the electrical storage module shown by FIG. It is a perspective view of the cooling member shown by FIG. It is a top view which shows a pair of electrical storage module and the cooling member interposed between electrical storage modules. It is sectional drawing along the VI-VI line of FIG.

  Hereinafter, an embodiment of a power storage device will be described with reference to the drawings. In the description of the drawings, the same elements or corresponding elements may be denoted by the same reference numerals, and redundant description may be omitted. In each drawing, orthogonal coordinates S defined by a first direction D1, a second direction D2, and a third direction D3 orthogonal to each other are shown.

  FIG. 1 is a perspective view showing a power storage device according to the present embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. Power storage device 10 shown in FIGS. 1 and 2 can be used as a battery of various vehicles such as, for example, a forklift, a hybrid car, and an electric car. The power storage device 10 includes a plurality of (three in the present embodiment) power storage modules 12, a plurality (four in the present embodiment) cooling members 14, and a restraining member 16. Power storage device 10 may include at least one pair of power storage modules 12 and at least one cooling member 14.

  The storage module 12 is, for example, a bipolar battery which has a rectangular plate shape and includes a plurality of bipolar electrodes (bipolar electrodes 32 described later) stacked along the first direction D1. The storage module 12 is, for example, a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. The following description exemplifies a nickel-hydrogen secondary battery.

  The cooling member 14 cools the storage module 12 by the flow of the refrigerant. The cooling members 14 are alternately arranged (stacked) in the first direction D1 with the storage modules 12 (the stack 30 (see FIG. 3)). The cooling members 14 are disposed between the two storage modules 12 adjacent in the first direction D1, and are also disposed outside the storage modules 12 positioned at both ends in the first direction D1. That is, focusing on a part on the center side of the storage device 10, the storage module 12 and the cooling member 14 are stacked such that the cooling member 14 is interposed between the storage modules 12 along the first direction D1.

  The cooling member 14 is formed of, for example, a conductive material such as metal and has conductivity. The cooling member 14 is electrically connected to the storage modules 12 adjacent to each other along the first direction D1. Thereby, the plurality of power storage modules 12 are connected in series in the first direction D1. In the first direction D1, the positive electrode terminal 24 is connected to the cooling member 14 located at one end, and the negative electrode terminal 26 is connected to the cooling member 14 located at the other end. The positive electrode terminal 24 may be integral with the cooling member 14 to which the positive electrode terminal 24 is connected. The negative electrode terminal 26 may be integral with the cooling member 14 to which the negative electrode terminal 26 is connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend along a third direction D3 which intersects (in this case, is orthogonal to) the first direction D1. The charge and discharge of the power storage device 10 can be performed by the positive electrode terminal 24 and the negative electrode terminal 26.

  The restraining member 16 is a member for restraining the storage module 12 and the cooling member 14 in the first direction D1. The restraint member 16 includes a pair of restraint plates 16A and 16B, a bolt 18, and a nut 20. The bolt 18 and the nut 20 are connecting members that connect the restraint plates 16A and 16B. An insulating film 22 such as a resin film is disposed between the restraint plates 16A and 16B and the cooling member 14, for example. Each restraint plate 16A, 16B is made of, for example, a metal such as iron.

  When viewed from the first direction D1, the storage module 12, the cooling member 14, the restraint plates 16A and 16B, and the insulating film 22 have, for example, a rectangular shape, and the longitudinal direction thereof corresponds to the third direction D3 and the respective short sides. The direction is arranged to be the second direction D2. The second direction D2 is a direction intersecting (in this case, orthogonal to) the first direction D1 and the third direction D3. Each restraint plate 16A, 16B is larger than the storage module 12, the cooling member 14, and the insulating film 22 when viewed from the first direction D1. The storage module 12 and the insulating film 22 are larger than the cooling member 14 when viewed from the first direction D1.

  The restraint plate 16A is provided with a plurality of insertion holes 16A1 for inserting the shaft portion of the bolt 18 in the first direction D1. The plurality of insertion holes 16A1 are provided at positions outside the storage module 12 as viewed from the first direction D1 at both ends of the restraint plate 16A in the second direction D2 and at both ends of the third direction D3. Similarly, the restraint plate 16B is provided with a plurality of insertion holes 16B1 for inserting the shaft portion of the bolt 18 in the first direction D1. The plurality of insertion holes 16B1 are provided on the outer sides of the storage module 12, the cooling member 14 and the insulating film 22 as viewed from the first direction D1 at both ends of the restraint plate 16B in the second direction D2 and both ends of the third direction D3. Provided at the

  One restraint plate 16A is abutted against the cooling member 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other restraint plate 16B is used for the insulating film 22 to the cooling member 14 connected to the positive electrode terminal 24. It is hit through. The bolt 18 is, for example, sequentially passed through the insertion hole 16A1 and the insertion hole 16B1 from the one restraint plate 16A side to the other restraint plate 16B side, and the tip of the bolt 18 protruding from the other restraint plate 16B is a nut 20. Are screwed together. As a result, the insulating film 22, the cooling member 14, and the storage module 12 are sandwiched and unitized, and a restraint load is applied in the first direction D1.

  FIG. 3 is a cross-sectional view showing the storage module shown in FIG. As shown in FIG. 3, the storage module 12 includes a stack 30. The stacked body 30 has a plurality of bipolar electrodes 32 stacked via the separator 40 along the first direction D1. The bipolar electrode 32 includes an electrode plate 34, a positive electrode 36 provided on one surface of the electrode plate 34, and a negative electrode 38 provided on the other surface of the electrode plate 34. In the stacked body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one bipolar electrode 32 adjacent to the other across the separator 40 along the first direction D 1, and the negative electrode 38 of one bipolar electrode 32. And the positive electrode 36 of the other bipolar electrode 32 adjacent to each other across the separator 40 along the first direction D1.

  In the first direction D1, an electrode plate 34 (a negative electrode side termination electrode) having the negative electrode 38 disposed on the inner surface is disposed at one end of the laminate 30 and a positive electrode 36 disposed on the inner surface at the other end of the laminate 30. An electrode plate 34 (positive electrode side end electrode) is disposed. The negative electrode 38 of the negative electrode side termination electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 via the separator 40. The positive electrode 36 of the positive electrode side termination electrode faces the negative electrode 38 of the lowermost bipolar electrode 32 via the separator 40. The electrode plates 34 of these terminal electrodes are connected to the adjacent cooling members 14 (see FIG. 2).

  The storage module 12 includes a frame 50 that holds an edge 34 a of the electrode plate 34 (bipolar electrode 32) on the side surface 30 a of the stacked body 30 extending along the first direction D1. The frame 50 is configured to surround the side surface 30 a of the stacked body 30. The frame 50 includes a first resin portion 53 for holding an edge portion 34a of the electrode plate 34 (bipolar electrode 32), and a second resin portion 54 provided around the first resin portion 53 when viewed from the first direction D1. Is equipped.

  The first resin portion 53 constituting the inner wall of the frame 50 is provided from one surface (surface on which the positive electrode 36 is formed) of the electrode plate 34 of each bipolar electrode 32 to the end surface of the electrode plate 34 at the edge 34 a There is. When viewed from the first direction D 1, each first resin portion 53 is provided over the entire circumference of the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32. Adjacent first resin portions 53 are welded on a surface extending to the outside of the other surface (surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, in the first resin portion 53, the edge 34a of the electrode plate 34 of each bipolar electrode 32 is buried and held.

  Similar to the edge 34 a of the electrode plate 34 of each bipolar electrode 32, the edge 34 a of the electrode plate 34 disposed at both ends of the laminated body 30 is also buried in the first resin portion 53 and held. Thus, an internal space (space) V airtightly partitioned by the electrode plate 34 and the first resin portion 53 is formed between the electrode plates 34 adjacent in the first direction D1. In the internal space V, an electrolytic solution (not shown) made of an alkaline solution such as a potassium hydroxide aqueous solution is accommodated.

  The second resin portion 54 constituting the outer wall of the frame 50 is a cylindrical portion extending with the first direction D1 as an axial direction. The second resin portion 54 extends over the entire length of the laminate 30 in the first direction D1. The second resin portion 54 covers the outer side surface of the first resin portion 53 extending in the first direction D1. The second resin portion 54 is welded to the first resin portion 53 on the inner side when viewed from the first direction D1.

  The electrode plate 34 is made of metal such as nickel or nickel plated steel plate. As an example, the electrode plate 34 is a rectangular metal foil made of nickel. The edge 34 a of the electrode plate 34 is an uncoated region on which the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is buried in the first resin portion 53 constituting the inner wall of the frame 50. It is an area to be held. As a positive electrode active material which comprises the positive electrode 36, nickel hydroxide is mentioned, for example. As a negative electrode active material which comprises the negative electrode 38, a hydrogen storage alloy is mentioned, for example. The formation region of the negative electrode 38 on the other surface of the electrode plate 34 is larger than the formation region of the positive electrode 36 on one surface of the electrode plate 34.

  The separator 40 is formed, for example, in a sheet shape. Examples of materials for forming the separator 40 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), and woven or non-woven fabrics made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like. . In addition, the separator 40 may be reinforced with a vinylidene fluoride resin compound. The separator 40 is not limited to a sheet but may be a bag.

  The frame 50 (the first resin portion 53 and the second resin portion 54) is formed in a rectangular cylindrical shape, for example, by injection molding using an insulating resin. As a resin material which comprises the frame 50, a polypropylene (PP), polyphenylene sulfide (PPS), or modified polyphenylene ether (modified PPE) etc. are mentioned, for example. The formation of the first resin portion 53 may be performed, for example, before the bipolar electrode 32 is stacked via the separator 40 and the stacked body 30 is formed, or is performed after the stacked body 30 is formed. It is also good. The formation of the second resin portion 54 is performed, for example, after the formation of the first resin portion 53 and the laminate 30. Thus, the frame 50 is a sealing body that forms the internal space V for containing the electrolytic solution in the storage module 12 and seals the internal space V as a whole.

  FIG. 4 is a perspective view of the cooling member shown in FIGS. FIG. 5 is a plan view showing a pair of storage modules and a cooling member interposed between the storage modules. The cooling member 14 shown in FIGS. 4 and 5 efficiently distributes the heat from the storage module 12 (see FIG. 1) to the outside by circulating the refrigerant inside the cooling member 14, thereby cooling the storage module 12. Do. The refrigerant has, for example, an insulating property, and is a gas such as air or ammonia, or a liquid such as LLC.

  The cooling member 14 has, for example, a rectangular plate shape, and is disposed such that the thickness direction is the first direction D1. The cooling member 14 has a pair of main surfaces 14a, a pair of first side surfaces 14b, and a pair of second side surfaces (end surfaces) 14c. The main surface 14a intersects (orthogonalizes) the first direction D1 and is substantially parallel. The first side surfaces 14b intersect (orthogonal) the third direction D3 and are substantially parallel to one another. The second side surfaces 14 c intersect (orthogonal) in the second direction and are substantially parallel to one another. The second side surface 14 c is an end surface of the cooling member 14 in the second direction D2.

  The cooling member 14 is formed with a plurality of flow paths (refrigerant flow paths) 15a for circulating the refrigerant along the second direction D2. The plurality of flow paths 15a extend linearly along the second direction D2 and open to the second side surface 14c (that is, form an opening 15d). The flow channels 15a are arranged along the third direction D3. The flow path 15a has a rectangular parallelepiped shape in the illustrated example, but may have another shape such as, for example, a cylindrical shape.

  The cooling member 14 includes a pair of flat plate-like flat portions 15 b intersecting in the first direction D 1 and a plurality of connection portions 15 c connecting the flat portions 15 b to each other. The connection parts 15c are arranged to be separated from each other along the third direction D3. Thus, the flow path 15a is formed so as to be surrounded by the flat plate portion 15b and the connection portion 15c.

  As described above, the opening 15 d of the flow passage 15 a is formed in the second side surface 14 c. The openings 15 d are used to flow the refrigerant into the flow path 15 a or to flow the refrigerant out of the flow path 15 a. The refrigerant flows into the inside of the flow path 15a through the opening 15d on one end side of the flow path 15a, for example, and then flows out from the inside of the flow path 15a through the opening 15d on the other end side of the flow path 15a. As described above, the cooling member 14 is provided with a through hole that penetrates the cooling member 14 along the second direction D2 as the flow path 15a.

  The cooling member 14 is smaller than the storage module 12 when viewed from the first direction D1, and is disposed on the inner side of the frame 50 of the storage module 12 so that the main surface 14a entirely abuts the electrode plate 34 There is. In other words, the outer edge C of the storage module 12 is located outside the cooling member 14 when viewed in the first direction D1. Here, the outer peripheral portion C of the rectangular annular shape of the storage module 12 protrudes from the cooling member 14 when viewed from the first direction D1.

  6 is a cross-sectional view taken along the line VI-VI of FIG. (B) of FIG. 6 is a partially enlarged view of (a) of FIG. As shown in FIGS. 5 and 6, the corner portions of the outer edge portion C of the storage module 12 opposed to each other across the cooling member 14 in the first direction D1 are chamfered in an R shape. This point will be described more specifically. When focusing on a cross section taken along the first direction D1 and the second direction D2 (hereinafter sometimes referred to simply as “in cross section”), the storage module 12 has a pair of first surfaces 17a along the first direction D1, And a pair of second surfaces 17b intersecting the first direction D1. The second surface 17 b is a surface facing the cooling member 14 (that is, a surface on the cooling member 14 side).

  Further, in the cross section, the storage module 12 includes a third surface 17 c connecting the first surface 17 a and the second surface 17 b. The third surface 17c forms a corner 17p. As an example, the first surface 17 a, the second surface 17 b, and the third surface 17 c are the outer surface of the second resin portion 54 of the frame 50. Here, the corner portion 17 p is chamfered by the third surface 17 c being a partial cylindrical surface which is convex to the outside of the storage module 12. In particular, the corner 17p of the outer edge C in the second direction D2 is chamfered. That is, in the storage module 12, the corner portion 17 p in the same direction as the direction in which the opening 15 d of the flow path 15 a of the cooling member 14 is formed is chamfered. However, here, the corner in the third direction D3 of the outer edge C is also chamfered in the same manner.

  The aspect of chamfering of the corner 17p and the thickness of the cooling member 14 in the first direction D1 have a fixed relationship. That is, the distance L1 between the start position and the end position of the chamfering in the first direction D1 is 1/2 or more of the thickness of the cooling member 14 in the first direction D1. Here, the start position of the chamfering is the first position P1 which is the connection position between the first surface 17a and the third surface 17c in the first direction D1. Further, the end position of the chamfering is a second position P2 which is a connection position of the second surface 17b and the third surface 17c in the first direction D1. Therefore, the distance L1 between the first position P1 and the second position P2 is 1/2 or more of the thickness L2 of the cooling member 14. Furthermore, here, the storage module 12 is chamfered by the third surface 17 c formed in a cylindrical shape as described above so as to reduce in size toward the second position P 2 from the first position P 1.

  Here, the cooling member 14 is partially buried in the storage module 12 as viewed in the second direction D2 (and the third direction D3) intersecting the first direction D1. More specifically, the second resin portion 54 of the frame 50 has the overlapping portion P where the stacked body 30 overlaps along the first direction D1, whereby the first direction D1 of the storage module 12 is obtained. The thickness along is relatively thin in the portion where there is no overlap P. The cooling member 14 is disposed in the relatively thin portion to be in contact with the stacked body 30. Accordingly, the cooling member 14 is buried in the storage module 12 by the thickness of the overlapping portion P when viewed in the second direction D2 (and the third direction D3) intersecting the first direction D1. In other words, the cooling member 14 is exposed to the outside at a portion not overlapping the overlapping portion P when viewed from the first direction D1.

  Here, the thickness L2 of the cooling member 14 described above is the thickness of a portion (a portion not overlapping the overlapping portion P) exposed to the outside of the cooling member 14. On the other hand, the second surface 17 b of the storage module 12 is the outer surface of the overlapping portion P here. Therefore, the thickness L2 of the cooling member 14 here is also a distance between the second surfaces 17b opposed to each other along the first direction D1. When the overlapping portion P is not provided to the second resin portion 54 of the frame 50, the thickness L2 of the cooling member 14 is simply the dimension of the cooling member 14 in the first direction D1. Good.

  As described above, in the storage device 10, the storage module 12 and the cooling member 14 are stacked such that the cooling member 14 is interposed between the storage modules 12 except for at least both end portions in the first direction D1. ing. Each of the storage modules 12 includes a frame 50 that holds the bipolar electrode 32 and forms an outer edge C. Then, corner portions 17p of the outer edge portion C of the pair of storage modules 12 facing each other across the cooling member 14 along the stacking direction (first direction D1) are chamfered. For this reason, even in the case where the storage module 12 is deformed such as being bent, the proximity of the outer edge portions C to each other can be avoided by the amount of chamfering of the corner portion 17p. Thereby, the inhibition of the exposure of the cooling member 14 is suppressed, and the reduction of the cooling efficiency is suppressed.

  Further, in power storage device 10, cooling member 14 has a pair of second side surfaces 14c in second direction D2 intersecting with first direction D1. Further, the cooling member 14 is formed with a flow path 15a which extends in the second direction D2 and is opened in each of the pair of second side surfaces 14c, and which circulates the refrigerant along the second direction D2. The corner 17p of the outer edge C in the second direction D2 is chamfered. Thus, by providing the flow path 15 a to the cooling member 14, the storage module 12 can be cooled more effectively. In this case, particularly, the opening 15d of the flow path 15a is formed in the second side surface 14c which is the end surface of the cooling member 14 in the second direction D2, and the corner 17p of the storage module 12 in the same direction is chamfered. It is done. Therefore, the exposure of the opening 15d of the flow path 15a is less likely to be inhibited, and the decrease in the cooling efficiency is reliably suppressed.

  Further, in the storage device 10, the storage module 12 includes a first surface 17a along the first direction D1, a second surface 17b that intersects the first direction D1 and faces the cooling member 14, and the first surface 17a. And a third surface 17c that forms the corner 17p by connecting the second surface 17b. The corner 17p is chamfered by a third surface 17c (in the form of a cylindrical surface in this case) formed so that the storage module 12 shrinks toward the second position P2 from the first position P1. Therefore, for example, when the frame 50 is manufactured by injection molding of a resin, if the division surfaces of the upper and lower molds are arranged at the center side position also at the first position P1 of the storage module 12, undercut The frame 50 can be easily manufactured while suppressing the occurrence of

  Furthermore, in power storage device 10, distance L1 between first position P1 and second position P2 is 1/2 or more of thickness L2 of cooling member 14 in first direction D1. For this reason, inhibition of the exposure of the cooling member 14 can be suppressed more reliably.

  The above embodiment describes one embodiment of the power storage device according to the present invention. Therefore, the power storage device according to the present invention is not limited to the above-described power storage device 10, and can be arbitrarily changed.

  For example, in the embodiment, the case where the flow path 15a is provided in the cooling member 14 and the storage module 12 is cooled by the flow of the refrigerant has been described. However, the cooling member 14 may be a solidly formed member. Also in this case, for the same reason, the inhibition of the exposure of the cooling member 14 is suppressed, and the reduction of the cooling efficiency is suppressed.

  Further, not only the corner portion 17p in the second direction D2 of the storage module 12 but also the corner portion in the third direction D3 are chamfered in the same manner, whereby inhibition of exposure of the cooling member 14 in the same direction is suppressed. The reduction in efficiency can be suppressed more reliably.

  Further, the chamfering of the corner 17p is not limited to the aspect in which the third surface 17c is formed in a cylindrical surface shape. For example, the corner portion 17p may be chamfered by forming the third surface 17c in a planar shape inclined such that the storage module 12 shrinks toward the second position P2 from the first position P1. Furthermore, the third surface 17 c is not limited to a single plane, and may be a surface formed by connecting a plurality of planes, or may be a curved surface other than a cylindrical surface. That is, the corner 17 p may be chamfered by the third surface 17 c formed so that the storage module 12 is reduced as it goes from the first position P 1 to the second position P 2.

  DESCRIPTION OF SYMBOLS 10 ... Storage device, 12 ... Storage module, 14 ... Cooling member, 14c ... 2nd side surface (end surface), 15a ... Flow path (refrigerant flow path), 15d ... Opening, 17a ... 1st surface, 17b ... 2nd surface, 17c: 3rd surface, 17p: corner portion, 32: bipolar electrode, 50: frame, C: outer edge portion, P1: first position, P2: second position, L1: distance, L2: thickness.

Claims (4)

At least a pair of rectangular plate-like storage modules including: a plurality of bipolar electrodes stacked along a first direction; and a frame provided to hold the bipolar electrodes;
And a cooling member for cooling the storage module.
The storage module and the cooling member are stacked such that the cooling member is interposed between the storage modules along the first direction,
An outer edge portion of the storage module is formed by the frame body,
When viewed from the first direction, the outer edge portion is located outside the cooling member,
The corners of the outer edge of the pair of storage modules facing each other across the cooling member in the first direction are chamfered.
Power storage device. The cooling member has a pair of end faces in a second direction intersecting the first direction,
The cooling member is formed with a refrigerant flow path which extends in the second direction and opens at each of the pair of end faces, and which circulates the refrigerant along the second direction,
The corner of the outer edge in the second direction is chamfered;
The power storage device according to claim 1. The storage module connects a first surface along the first direction, a second surface intersecting the first direction and facing the cooling member, and connecting the first surface and the second surface. And a third surface forming the corner portion,
The corner portion is a connection position of the second surface and the third surface in the first direction from a first position which is a connection position of the first surface and the third surface in the first direction. The electric storage module is chamfered by the third surface, which is formed so as to shrink toward the second position,
The power storage device according to claim 1. The distance between the first position and the second position is 1⁄2 or more of the thickness of the cooling member in the first direction.
The power storage device according to claim 3.

Images