CN106953134B - Power storage device - Google Patents

Abstract

The present invention relates to a power storage device in which cooling air for supplying to ventilation passages formed between power storage elements is less likely to leak to the outside. In the present embodiment, a power storage device is characterized by including: at least one power storage element; Path; at a position facing the ventilation path and at a position near the power storage element in the cooling air flow direction in the ventilation path, the separator has an opposing portion facing the adjacent separator with the power storage element sandwiched therebetween. , one of the pair of opposing portions of the intermediate member disposed on both sides of the storage element facing each other has an extending portion extending toward the other opposing portion of the pair of opposing portions, and the extending portion is The other opposing portion is in contact with each other.

Description

Power storage device

technical field

The present invention relates to a power storage device including a power storage element.

Background technique

A large-capacity power source is required for various devices such as electric vehicles, and therefore, a power storage device including a plurality of power storage elements is used. As shown in FIGS. 13 to 15 , such a power storage device includes a power storage element 50 and a separator 51 adjacent to the power storage element 50 . The separator 51 has the storage elements 50 arranged on both sides thereof, and forms a ventilation passage 510 through which cooling air can flow between adjacent storage elements 50 . In addition, at a position facing the ventilation path 510 and at a position near the power storage element 50 in the cooling air flow direction in the ventilation path 510 formed between the adjacent power storage elements 50, the separator 51 has a space between The storage element 50 is an opposing portion facing the adjacent separator 51 .

In the storage element 5 , a gap 514 is formed between the opposing portions 511 of the separators 51 arranged on both sides of the storage element 50 , and the gap 514 extends from the end edge of the opposing portion 511 on the ventilation passage 510 side. 512 extends to the end edge 513 on the opposite side of the ventilation passage 510 . Therefore, when cooling air for cooling the power storage element 50 is supplied to the ventilation passage 510 , a part of the cooling air leaks from the ventilation passage 514 to the outside of the power storage device 5 through the gap, whereby the air in the power storage device 5 The cooling effect of the power storage element 50 decreases.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2010-157450

SUMMARY OF THE INVENTION

The problem to be solved by the invention

Therefore, in view of the above-mentioned problems, an object of the present invention is to provide a power storage device in which cooling air is less likely to leak to the outside, and the cooling air is supplied to ventilation passages formed between power storage elements.

means of solving problems

The power storage device of the present invention is characterized by having:

at least one storage element;

a separator, which is a separator adjacent to the power storage element, and forms a ventilation path through which cooling air can flow between the separator and the power storage element;

At a position facing the ventilation passage and at a position adjacent to the electricity storage element in the flow direction of the cooling air in the ventilation passage, the partition plate has a partition adjacent to the electricity storage element with the electricity storage element therebetween. the opposite part where the plates are opposed,

One of a pair of opposed portions of the separators disposed on both sides of the storage element that are opposed to each other has an extension portion extending toward the other opposed portion of the pair of opposed portions ,

The extension portion is in contact with the other opposing portion.

According to this structure, by the extending portion extending from one opposing portion to the other opposing portion between the pair of opposing portions, it is possible to prevent air from passing between the opposing portions from the end edge on the ventilation passage side of the opposing portion The flow toward the end edge on the opposite side of the ventilation passage. As a result, it is possible to prevent the cooling air from leaking to the outside of the power storage device through between the pair of opposing portions.

In the power storage device, optionally,

The other opposing portion has an inclined surface inclined with respect to a first direction and a second direction in which the pair of opposing portions face each other, and the second direction is opposite to the cooling air The flow direction is orthogonal to the direction,

The extension part is in contact with at least a part of the inclined surface.

According to this configuration, the extension portion is in contact with the inclined surface such that the contact portion between the extension portion and the inclined surface extends in a direction intersecting the second direction. Thereby, the flow of air between the opposing portions from the end edge on the ventilation passage side of the opposing portion toward the end edge on the opposite side of the ventilation passage can be more effectively inhibited.

In the power storage device, preferably,

The extension portion can be elastically deformed by contact with the inclined surface.

According to this configuration, since the extension portion can be elastically deformed along the inclined surface, even if the interval between the opposing portions is narrowed due to manufacturing errors or the like, the variation in the interval can be absorbed by the elastic deformation. That is, even if the space|interval of an opposing part becomes narrow due to a manufacturing error etc., an extension part can elastically deform along a contact surface, and can maintain the state in contact with an inclined surface.

In the power storage device, preferably,

The other opposing portion has a pair of the inclined surfaces,

The pair of inclined surfaces face each other at an interval in the second direction, and the interval becomes narrower as the pair of inclined surfaces is separated from the one opposite portion in the direction in which the pair of opposite portions face each other,

The one opposing portion has a pair of the extending portions at positions facing the pair of inclined surfaces,

The pair of extension parts are arranged at intervals in the second direction, and the distance between the front ends of the pair of extension parts is greater than the distance between the ends of the pair of inclined surfaces on the side of the one opposing part. The distance between the inclined surfaces is small, and is larger than the distance between the inclined surfaces at the end of the pair of inclined surfaces on the opposite side of the one opposing portion.

According to this configuration, the pair of extension parts are elastically deformed so that the distance between the front ends of the pair of extension parts becomes narrower as the distance between the opposing parts becomes narrower, so that the distance between the opposing parts is restored. force becomes stronger. In this way, since the adjacent separators are in a state equivalent to being connected by the elastic body, the resistance to vibration in the power storage device is improved.

In the power storage device, optionally,

The one opposing portion has a plurality of the extending portions,

The other opposing portion has the inclined surfaces in the number corresponding to the plurality of the extending portions.

According to this configuration, the plurality of extension parts can inhibit the flow of air between the pair of opposing parts from the end edge on the ventilation passage side of the opposing part toward the end edge on the opposite side of the ventilation passage. Thereby, leakage of cooling air to the outside of the power storage device through between the pair of opposing portions can be more effectively suppressed.

In the power storage device,

The extending portion has an inclined surface inclined with respect to a first direction in which the pair of opposing portions face each other and a second direction in which the pair of opposing portions face each other, and the second direction is a flow direction of the cooling air orthogonal directions,

The other opposing portion is in contact with at least a part of the inclined surface of the extending portion.

According to this configuration, the extension portion is in contact with the inclined surface such that the contact portion between the inclined surface of the extension portion and the opposing portion extends in the direction intersecting the second direction. Thereby, the flow of air between the opposing portions from the end edge on the ventilation passage side of the opposing portion toward the end edge on the opposite side of the ventilation passage can be more effectively inhibited.

In the power storage device, optionally,

The extending portion has a first inclined surface inclined with respect to a first direction and a second direction, the first direction being the direction in which the pair of opposing portions face each other, and the second direction being opposite to the cooling air The direction of flow orthogonal to the direction,

The other opposing portion has a second inclined surface inclined with respect to a first direction and a second direction, the first direction being a direction in which the pair of opposing portions face each other, and the second direction is the same as the The direction perpendicular to the flow direction of the cooling air,

The first inclined surface is in contact with at least a part of the second inclined surface.

According to this configuration, the extending portion (the first inclined surface) is in contact with the other opposing portion (the second inclined surface) so that the contact portion between the first inclined surface and the second inclined surface is along the direction intersecting the second direction. direction extension. In contrast, the flow of air between the opposing portions from the end edge on the ventilation passage side of the opposing portion toward the end edge on the opposite side of the ventilation passage can be more effectively inhibited.

In the power storage device, when the first inclined surface and the second inclined surface are provided, preferably,

The angle α of the second inclined surface with respect to the first inclined surface satisfies: 0°<α.

If the first inclined surface and the second inclined surface are parallel, a gap may be generated between the first inclined surface and the second inclined surface due to a manufacturing error in manufacturing the separator. However, as in the above configuration, if the angle α is larger than 0°, that is, the first inclined surface and the second inclined surface are not parallel to each other, it is possible to prevent the occurrence of a gap due to the manufacturing error.

In the power storage device, preferably,

The extending portion is in contact with the other opposing portion over the entire region of the other opposing portion in the flow direction of the cooling air.

According to this configuration, in the entire area between the opposing portions in the flow direction of the cooling air, it is possible to block the air between the opposing portions from the end edge on the ventilation passage side of the opposing portion toward the end on the opposite side of the ventilation passage flow of edge. Thereby, leakage of cooling air to the outside of the power storage device through between the pair of opposing portions can be more effectively suppressed.

Invention effect

As described above, according to the present invention, it is possible to provide a power storage device in which cooling air that is supplied to ventilation passages formed between power storage elements is less likely to leak to the outside.

Description of drawings

FIG. 1 is a perspective view of a power storage device according to an embodiment of the present invention.

2 is a perspective view of a power storage element of the power storage device according to the same embodiment.

3 is a front view of a power storage element of the power storage device according to the same embodiment.

FIG. 4 is an exploded perspective view of the power storage device according to the same embodiment.

5 is a perspective view of an internal separator, an external separator, and a power storage element of the power storage device according to the same embodiment.

6 is a side view of an electric storage element and a separator of the electric storage device according to the same embodiment.

FIG. 7 is an enlarged view of the power storage device according to the same embodiment, and is an enlarged view of a region VII in FIG. 6 .

FIG. 8 is an enlarged view of the power storage device according to the same embodiment, and is an enlarged view of a region VIII in FIG. 6 .

FIG. 9 is an enlarged view of the power storage device according to the same embodiment, and is an enlarged view of a region IX in FIG. 6 .

10 is an enlarged view of a power storage device according to another embodiment of the present invention.

11 is a schematic diagram for explaining a state in which a pipe is attached to the power storage device.

FIG. 12 is a schematic diagram for explaining the flow of cooling air in a state where a duct is attached to the power storage device.

13 is a side view of a conventional power storage device.

14 is an enlarged view of a conventional power storage device, and is an enlarged view of a region in the vicinity of the opposing portion in the separator.

15 is an exploded perspective view of a conventional power storage device.

Description of reference numerals

1...Storage element, 2...Separator, 2A...Inner spacer, 2B...Outer spacer, 3...Holding member, 4...Insulator, 5...Sealing member, 6...Pipe, 10...Case, 11...External terminal , 20...base, 20A...base, 20B...base, 21A...restricting portion, 21B...restricting portion, 22B...fitting portion, 23B...shaft portion, 30...terminal member, 31...frame, 31A...first frame, 31B ...second frame, 40...first insulating portion, 41...second insulating portion, 42...third insulating portion, 100...case body, 100a...closure portion, 100b...body portion, 100c...first wall, 100d... 2nd wall, 101...cover plate, 200A...first abutting portion, 200B...projecting portion (internal contact portion), 201A...second abutting portion, 201B...connecting portion, 202A...connecting portion, 202B...ventilation passage, 203A...ventilation passage, 210A...first restricting piece, 210B...first restricting piece, 211A...second restricting piece, 211B...second restricting piece, 212A...extension portion, 212B...extension portion, 213A...inclined surface (extension portion 213B...inclined surface (inclined surface of extension), 214A...extension surface, 214B...extension surface, 215A...contact surface, 215B...contact surface, 216A...inclined surface, 216B...inclined surface, 217A ...recess, 217B...recess, 300...crimping portion, 300a...insertion hole, 300b...through hole, 310...first connection portion, 311...second connection portion, 312...support portion, 312a...first support portion, 312b ...second support portion, 313...fixed portion, 313a...first fixed portion, 313b...second fixed portion, 313c...first hole portion, 313d...second hole portion, α...angle

Detailed ways

Hereinafter, one embodiment of the power storage device of the present invention will be described with reference to the drawings. In addition, the name of each member in this embodiment is the name in this embodiment, and may differ from the name of each member in a background art.

As shown in FIG. 1 , the power storage device includes a power storage element 1 , a separator 2 adjacent to the power storage element 1 , and a holding member 3 that integrally holds the power storage element 1 and the separator 2 . The holding member 3 is formed of a conductive material. Further, the power storage device includes an insulator 4 , and the insulator 4 is arranged between the power storage element 1 and the holding member 3 .

As shown in FIGS. 2 and 3 , the storage element 1 includes an electrode body including a positive electrode and a negative electrode, a case 10 that accommodates the electrode body, and a pair of external terminals 11 arranged on the outer surface of the case 10 .

The case 10 includes a case body 100 and a cover plate 101 , the case body 100 has an opening, the cover plate 101 closes the opening of the case body 100 , and a pair of external terminals 11 are arranged on the outer surface of the cover plate 101 .

The case body 100 includes a closing portion 100a (see FIG. 3 ) and a cylindrical main body portion 100b, and the main body portion 100b is connected to the peripheral edge of the closing portion 100a so as to surround the closing portion 100a.

The main body portion 100b includes a pair of first walls 100c and a pair of second walls 100d, the pair of first walls 100c are opposed to each other at a distance from each other, and the pair of second walls 100d are opposed to each other with the pair of first walls 100c sandwiched therebetween. .

The first wall 100c and the second wall 100d are each formed in a rectangular shape. That is, the respective surfaces of the first wall 100c and the second wall 100d are flat surfaces, and constitute a quadrangular region. The 1st wall 100c and the 2nd wall 100d are arrange|positioned adjacent to the state in which the edge edges mutually contact|abut. In addition, the end edges of the adjacent first walls 100c and the end edges of the second walls 100d are connected to each other over the entire length. Thereby, the main body part 100b is formed in a rectangular cylindrical shape. One end of the main body portion 100b is closed by the closing portion 100a. On the other hand, the other end of the main body portion 100b is open. In the housing 10 , this opening is closed by a cover plate 101 .

In this embodiment, the surface area of the first wall 100c is larger than the surface area of the second wall 100d. In addition, the main body portion 100b is formed in a flat rectangular cylindrical shape.

The power storage device according to the present embodiment includes a plurality of power storage elements 1 . The plurality of power storage elements 1 are arranged in the same direction, respectively. In the present embodiment, the plurality of power storage elements 1 are aligned with the first walls 100c of the case 10 in the same direction, respectively. The power storage device includes a bus bar that electrically connects the external terminals 11 of two adjacent power storage elements 1 to each other.

In addition, in the following description, for the sake of convenience, the arrangement direction (first direction) of the storage elements 1 is referred to as the X-axis direction. In addition, one of the two axial directions (the second direction) which are orthogonal to the arrangement direction (X-axis direction) of the power storage elements 1 and are orthogonal to each other is called the Z-axis direction, and the other one is called the Z-axis direction. as the Y-axis direction. In addition, in each drawing, three orthogonal axes (coordinate axes) corresponding to the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively, are illustrated as an aid.

The separator 2 has insulating properties. The separator 2 has a base portion adjacent to the case 10 (the first wall 100c of the main body portion 100b ) of the electrical storage element 1 and a restricting portion that prevents positional deviation of the electrical storage element 1 adjacent to the base portion .

The separator 2 will be described in more detail. As described above, the power storage device includes the plurality of power storage elements 1 . Furthermore, as shown in FIG. 4 , the power storage device includes two types of separators 2 ( 2A, 2B). That is, as the separator 2 , the power storage device includes: a separator (hereinafter referred to as an internal separator) 2A arranged between the two power storage elements 1 ; The adjacent separators (hereinafter referred to as external separators) 2B of the storage elements 1 are provided.

First, the internal partition 2A will be described. As shown in FIG. 5 , the internal separator 2A has a base portion 20A adjacent to the storage element 1 (the first wall 100 c of the case body 100 ), and a restriction portion 21A that prevents the base portion 20A from being adjacent to the base portion 20A. Positional deviation of the two storage elements 1 .

The base portion 20A of the internal separator 2A is sandwiched between the two storage elements 1 . Therefore, the base portion 20A of the separator 2A has a first surface and a second surface on the opposite side of the first surface, the first surface facing one of the two adjacent energy storage elements 1, and the first surface The two surfaces are opposed to the other of the two power storage elements 1 .

The base portion 20A of the internal separator 2A has a first end arranged at a position corresponding to the cover plate 101 of the power storage element 1 and a second end opposite to the first end, and the second end is arranged at a position corresponding to the cover plate 101 of the storage element 1 . The position corresponding to the closing portion 100 a of the storage element 1 . In addition, the base portion 20A of the internal separator 2A has a third end and a fourth end on the opposite side of the third end, the third end being arranged at a position corresponding to one second wall 100d of the power storage element 1, and the fourth end It is arranged at a position corresponding to the other second wall 100 d of the power storage element 1 .

The base portion 20A of the internal partition 2A has a first corner portion, which is a portion where the first end and the third end of the base portion 20A are connected, and a second corner portion, which is a portion where the first end and the fourth end are connected. Further, the base portion 20A of the internal partition 2A has a third corner portion, which is a portion where the second end and the third end are connected, and a fourth corner portion, which is a portion where the second end and the fourth end are connected, respectively.

Further, the first end and the second end of the base portion 20A of the internal partition 2A extend in the Y-axis direction. Furthermore, the third end and the fourth end of the base portion 20A of the internal partition 2A extend in the Z-axis direction. Therefore, the base portion 20A of the internal partition 2A is formed in a substantially rectangular shape. In addition, the base portion 20A of the internal separator 2A is formed in a size substantially equal to that of the first wall 100 c of the electrical storage element 1 .

In the power storage device of the present embodiment, between the first surface of the base portion 20A of the internal separator 2A and the power storage element 1 and between the second face of the base portion 20A of the internal separator 2A and the power storage element 1 In either of them, a ventilation passage for passing a fluid (cooling fluid) is formed.

More specifically, it demonstrates. The base portion 20A of the internal partition 2A is formed in a rectangular wave shape. In the storage element 1 of the present embodiment, the base portion 20A of the internal separator 2A has the first contact portion 200A and the second contact portion 201A, and the first contact portion 200A is only in contact with two adjacent storage elements 1 . One of the electric storage elements 1 is in contact with each other, and the second contact portion 201A is in contact with only the other electric storage element 1 of the two adjacent electric storage elements 1 . Also, the base portion 20A of the inner partition 2A has a coupling portion 202A, and the coupling portion 202A is connected to the first abutting portion 200A and the second abutting portion 201A.

The long side of the first contact portion 200A is in the Y-axis direction. The long side of the second contact portion 201A is in the Y-axis direction.

The base portion 20A of the internal partition 2A has a plurality of first abutting portions 200A and a plurality of second abutting portions 201A. Further, each of the first abutting portions 200A and each of the second abutting portions 201A are alternately arranged in the direction in which the first end and the second end of the base portion 20A of the inner partition plate 2A are arranged.

As a result, as shown in FIG. 6 , in the power storage device, the ventilation passage 203A is formed by the surface on the opposite side of the surface of the first contact portion 200A that is in contact with the power storage element 1 and the surface connected to the first contact portion 200A. A pair of coupling parts 202A are formed. In addition, in the power storage device, the ventilation passage 203A is formed by the surface on the opposite side of the surface of the second contact portion 201A that is in contact with the power storage element 1, and a pair of connecting portions 202A connected to the second contact portion 201A . Therefore, in the power storage device, cooling is formed between the first surface of the base portion 20A of the internal separator 2A and the power storage element 1 , and between the second surface of the base portion 20A of the internal separator 2A and the power storage element 1 , respectively. 203A of ventilation paths through which wind can flow.

As described above, the internal separator 2A is arranged between the two adjacent storage elements 1 . Therefore, the internal separator 2A is provided with two restricting portions 21A that should restrict the relative movement of the two energy storage elements 1 adjacent to the internal separator 2A, the two restricting portions 21A being directed toward the internal separator 2A. The restriction portion 21A extending toward the storage element 1 adjacent to the first surface of the base portion 20A of the base portion 20A extends toward the storage element 1 adjacent to the second surface of the base portion 20A of the internal separator 2A.

More specifically, it demonstrates. As shown in FIG. 5 , restricting portions 21A are formed at each corner portion of the base portion 20A of the inner partition plate 2A.

Each restricting portion 21A includes a first restricting piece 210A connected to the outer edge of the base portion 20A extending in the Z-axis direction, a second restricting piece 211A connected to the outer edge of the base portion 20A extending in the Y-axis direction, and the first restricting piece 210A extends from the base portion 20 in the X-axis direction, and the second restricting piece 211A extends from the base portion 20A in the X-axis direction.

The first restricting piece 210A of the restricting portion 21A formed in the first corner portion is connected to the third end of the base portion 20A. The second restricting piece 211A of the restricting portion 21A formed in the first corner portion is connected to the first end of the base portion 20A.

The first restricting piece 210A of the restricting portion 21A formed in the second corner portion is connected to the fourth end of the base portion 20A. The second restricting piece 211A of the restricting portion 21A formed in the second corner portion is connected to the first end of the base portion 20A.

The first restricting piece 210A of the restricting portion 21A formed in the third corner portion is connected to the third end of the base portion 20A. The second restricting piece 211A of the restricting portion 21A formed in the third corner portion is connected to the second end of the base portion 20A.

The first restricting piece 210A of the restricting portion 21A formed in the fourth corner portion is connected to the fourth end of the base portion 20A. The second restricting piece 211A of the restricting portion 21A formed in the fourth corner portion is connected to the second end of the base portion 20A.

As described above, the internal separator 2A includes the restricting portion 21A extending toward the storage element 1 adjacent to the first surface of the base portion 20A, and the storage portion 21A extending toward the second surface of the base portion 20A of the internal separator 2A. The restricting portion 21A where the element 1 extends. Therefore, in each of the inner partitions 2A, the first restricting pieces 210A of the pair of restricting portions 21A constitute opposing portions facing each other on two adjacent (Japanese: 両neighboring) partitions 2 in the X-axis direction.

The opposing portion 210A is arranged at a position facing the ventilation passage 203A and at a position adjacent to the power storage element 1 in the cooling air flow direction in the ventilation passage 203A. Moreover, 210 A of opposing parts are arrange|positioned so that it may line up in the X-axis direction.

As shown in FIG. 7 , in the internal separator 2A, the opposing portion 210A is in contact with the opposing portion 210A of the adjacent internal separator 2A on one side in the X-axis direction via the storage element 1 .

More specifically, it demonstrates. One opposing portion 210A has an extension portion 212A that extends from the opposing portion 210A to one side in the X-axis direction. The other opposing portion 210A has an inclined surface 216A formed in the opposing portion 210A, and the inclined surface 216A is in contact with the extending portion 212A of the opposing portion 210A adjacent to the other side in the X-axis direction.

The extension portion 212A is in contact with the inclined surface 216A of the opposing portion 210A adjacent to one of the X-axis directions. In addition, the extension portion 212A has a surface that is in contact with at least a part of the inclined surface 216A of the opposing portion 210A adjacent to one of the X-axis directions.

The extension portion 212A of the present embodiment has an inclined surface 213A that faces the inclined surface 216A of the opposing portion 210A adjacent to one of the X-axis directions in the Z-axis direction. In addition, the extension portion 212A has an extension surface 214A that extends straight from the inclined surface 213A in the X-axis direction.

The inclined surface 213A is a surface inclined with respect to the respective directions of the X-axis direction and the Z-axis direction. The extending surface 214A is a surface extending in the X-axis direction and the Y-axis direction.

Therefore, in the extending portion 212A of the opposing portion 210A, a surface that contacts at least a part of the inclined surface 216A of the opposing portion 210A adjacent in the X-axis direction is bent at a halfway position in the X-axis direction. In addition, in this embodiment, the following description may be made with the surface including the inclined surface 213A and the extension surface 214A as the contact surface 215A.

Furthermore, in the opposing portion 210A of the present embodiment, the pair of extension portions 212A are arranged at intervals in the Z-axis direction. In the Z-axis direction, the pair of extension portions 212A are respectively arranged so that their abutting surfaces 215A face in opposite directions. In addition, each of the pair of extension parts 212A has elasticity.

The inclined surface 216A of the opposing portion 210A is inclined with respect to the X-axis direction and the Z-axis direction (direction opposing the pair of opposing portions 210A and directions orthogonal to both directions of the cooling air flow direction). That is, the inclined surface 216A of the opposing portion 210A is formed so as to be inclined with respect to the planes extending in the X-axis direction and the Y-axis direction, and extend straight in the Y-axis direction.

The inclined surface 216A of the present embodiment is constituted by a part of the concave portion 217A formed in the other first restricting piece 210A, and the concave portion 217A is opened toward the opposing portion 210A adjacent to the X-axis direction. Therefore, the opposing portion 210A has a pair of inclined surfaces 216A that are opposed to each other at a distance in the Z-axis direction.

In the X-axis direction, the pair of inclined surfaces 216A are respectively arranged at positions aligned with the respective extension portions 212A of the pair of extension portions 212A.

The pair of inclined surfaces 216A are formed so that the distance between them becomes narrower as they move away from the opposing portion 210A adjacent to each other in the X-axis direction.

In addition, in the opposing portion 210A, the portions on the opening side of the concave portion 217A in each of the inclined surfaces 216A are spaced so that the distance between each other is larger than the distance between the front end portions of the pair of extension portions 212A (the distance between the abutting surfaces 215A). arrangement.

Further, in the opposing portion 210A, the portions on the bottom surface side of the recessed portion 217A in each of the inclined surfaces 216A of the pair of inclined surfaces 216A are spaced apart from each other smaller than the space between the end portions on the front end side of the pair of extending portions 212A ( The contact surfaces 215A are arranged so as to be spaced apart from each other).

Next, the outer separator 2B will be described. As shown in FIG. 5 , the outer separator 2B includes a base ( Hereinafter, referred to as a base portion) 20B, and a restriction portion (hereinafter referred to as a restriction portion) 21B that determines the position of the power storage element 1 adjacent to the base portion 20B.

The base portion 20B of the outer partition 2B of the present embodiment faces a terminal member 30 of the holding member 3 which will be described later. That is, the outer separator 2B is arranged between the storage element 1 and the terminal member 30 (see FIG. 4 ).

Further, the outer partition 2B has a fitting portion 22B to which the terminal member 30 is fitted at a position where the base portion 20B faces the terminal member 30 . That is, the outer partition 2B has a fitting portion 22B for determining the position of the terminal member 30 with respect to the base portion 20B, and the fitting portion 22B is formed on the second surface of the base portion 20B. In addition, the outer partition 2B has a shaft portion 23B for determining the position of the terminal member 30 with respect to the base portion 20B, and the shaft portion 23B protrudes from the second surface of the base portion 20B.

The base portion 20B of the outer partition 2B extends in the Y-axis direction and the Z-axis direction. That is, the base portion 20B is formed in a plate shape. The base portion 20B of the outer separator 2B has a first end arranged at a position corresponding to the cover plate 101 of the power storage element 1 and a second end opposite to the first end, and the second end is arranged at a position corresponding to the cover plate 101 of the power storage element 1 . The position corresponding to the closing portion 100 a of the storage element 1 . In addition, the base portion 20B of the outer separator 2B has a third end and a fourth end on the opposite side of the third end, the third end being arranged at a position corresponding to one second wall 100d of the power storage element 1, and the fourth end It is arranged at a position corresponding to the other second wall 100 d of the power storage element 1 .

The base portion 20B of the outer partition 2B has a first corner portion, which is a portion where the first end and the third end are connected, and a second corner portion, which is a portion where the first end and the fourth end are connected. Further, the base portion 20B of the outer partition 2B has a third corner portion, which is a portion where the second end and the third end are connected, and a fourth corner portion, which is two portions where the second end and the fourth end are connected, respectively.

In addition, the first end and the second end of the base portion 20B of the outer partition 2B extend in the Y-axis direction. Furthermore, the third end and the fourth end of the base portion 20B of the outer separator 2B extend in a direction orthogonal to the Z-axis direction. Therefore, the base portion 20B of the outer partition 2B has a substantially rectangular shape. In addition, the size of the base portion 20B of the external separator 2B is substantially equal to the size of the first wall 100 c of the electrical storage element 1 .

On the first surface of the base portion 20B of the outer separator 2B, a ventilation passage for passing fluid between the first surface of the base portion 20B and the storage element 1 is formed.

More specifically, it demonstrates. The outer separator 2B has a protruding portion 200B protruding from the first surface of the base portion 20B toward the power storage element 1 , and the protruding portion 200B (hereinafter referred to as an internal contact portion) is in contact with the power storage element 1 . The internal contact portion 200B extends from the first surface of the base portion 20B toward the case 10 (the first wall 100 c of the case body 100 ) of the power storage element 1 .

The long side of the internal contact portion 200B is in the Y-axis direction. As shown in FIG. 6 , the base portion 20B of the external separator 2B of the present embodiment has a plurality of internal contact portions 200B. Further, the plurality of internal contact portions 200B are respectively arranged at intervals in the direction orthogonal to the longitudinal direction. Also, the base portion 20B of the outer partition 2B has coupling portions 201B which are respectively connected to the protruding portions 200B adjacent to each other in the Z-axis direction. Thereby, a plurality of ventilation passages 202B through which cooling air can flow are formed between the base portion 20B of the outer separator 2B and the power storage element 1 .

As described above, the first surface of the external separator 2B is adjacent to the storage element 1 . Therefore, the outer separator 2B includes a restricting portion 21B that should restrict the relative movement of the energy storage element 1 adjacent to the first surface, and the restricting portion 21B faces the first surface adjacent to the base portion 20B of the outer separator 2B. The storage element 1 extends.

More specifically, it demonstrates. As shown in FIG. 5, the restriction|limiting part 21B is formed in each corner|angular part of the base part 20B of the outer partition 2B.

Each restricting portion 21B has a first restricting piece 210B connected to the outer edge of the base portion 20B extending in the Z-axis direction, a second restricting piece 211B connected to the outer edge of the base portion 20B extending in the Y-axis direction, and the first restricting piece 210B extends from the base 20 in the X-axis direction, and the second restricting piece 211B extends from the base 20B in the X-axis direction.

The first restricting piece 210B of the restricting portion 21B formed in the first corner portion is connected to the third end of the base portion 20B. The second restricting piece 211B of the restricting portion 21B formed in the first corner portion is connected to the first end of the base portion 20B.

The first restricting piece 210B of the restricting portion 21B formed in the second corner portion is connected to the fourth end of the base portion 20B. The second restricting piece 211B of the restricting portion 21B formed in the second corner portion is connected to the first end of the base portion 20B.

The first restricting piece 210B of the restricting portion 21B formed in the third corner portion is connected to the third end of the base portion 20B. The second restricting piece 211B of the restricting portion 21B formed in the third corner portion is connected to the second end of the base portion 20B.

The first restricting piece 210B of the restricting portion 21B formed at the fourth corner portion is connected to the fourth end of the base portion 20B. The second restricting piece 211B of the restricting portion 21B formed in the fourth corner portion is connected to the second end of the base portion 20B.

As described above, the outer separator 2B includes the restricting portion 21B extending toward the storage element 1 adjacent to the first surface of the base portion 20B. Therefore, in the outer partition plate 2B, each of the first restricting pieces 210B of the restricting portion 21B constitutes an opposing portion 210A facing the inner partition plate 2A adjacent in the X-axis direction.

The opposing portion 210B of the outer partition 2B is arranged at a position facing the ventilation passage 202B and at a position adjacent to the storage element 1 in the cooling air flow direction in the ventilation passage 202B. Moreover, the opposing part 210B of the outer partition plate 2B is arrange|positioned so that it may line up with the opposing part 210A of each inner partition plate 2A in the X-axis direction.

As shown in FIG. 6 , in the outer separator 2B, the opposing portion 210B of the outer separator 2B is in contact with the opposing portion 210A of the inner separator 2A adjacent in the X-axis direction via the storage element 1 .

As described above, the outer separator 2B of the present embodiment is disposed adjacent to the inner separator 2A via the storage element 1 . That is, the power storage device includes a pair of external separators 2B.

Therefore, as shown in FIG. 8 , the opposing portion 210B of the one outer partition 2B has an extension portion 212B extending from the first restricting piece 210B to one side in the X-axis direction.

The extension portion 212B is in contact with the inclined surface 216A of the opposing portion 210A of the inner partition plate 2A adjacent to the X-axis direction. Therefore, the extension part 212B has a surface contacting at least a part of the inclined surface 216A of the opposing part 210A of the inner partition plate 2A adjacent to the X-axis direction.

The extension portion 212B of the present embodiment has an inclined surface 213B that faces the inclined surface 216A of the opposing portion 210A of the inner partition plate 2A adjacent in the X-axis direction in the Z-axis direction. In addition, the extension portion 212B has an extension surface 214B that extends straight from the inclined surface 213B in the X-axis direction.

The inclined surface 213B is a surface inclined with respect to the respective directions of the X-axis direction and the Z-axis direction. The extending surface 214B is a surface extending in the X-axis direction and the Y-axis direction.

Therefore, in the extending portion 212B of the opposing portion 210B, the surface in contact with at least a part of the inclined surface 216A of the opposing portion 210A of the inner partition plate 2A adjacent in the X-axis direction is bent at a halfway position in the X-axis direction. fold. In addition, in this embodiment, the following description may be made with the surface including the inclined surface 213B and the extending surface 214B as the contact surface 215B.

Furthermore, in the present embodiment, in the opposing portion 210B of the outer partition 2B, the pair of extending portions 212B are arranged at intervals in the Z-axis direction. In the Z-axis direction, the pair of extension portions 212B are respectively arranged so that their abutting surfaces 215B face in opposite directions. In addition, each of the pair of extension parts 212B has elasticity.

As shown in FIG. 9 , the opposing portion 210B of the other outer separator 2B has an inclined surface 216B in contact with the extending portion 212A of the opposing portion 210A of the inner separator 2A adjacent to the other side in the X-axis direction, The inclined surface 216B is opposed to each of the X-axis direction and the Z-axis direction (the direction in which the opposed portion 210B of the outer partition plate 2B and the opposed portion 210A of the inner partition plate 2A are opposed to each other, and the flow direction of the cooling air). Orthogonal direction) tilt.

As described above, the inclined surface 216B of the opposing portion 210B of the other outer partition 2B is inclined with respect to the respective directions of the X-axis direction and the Z-axis direction. That is, the inclined surface 216B of the opposing portion 210B of the outer partition 2B is formed so as to be inclined with respect to the planes extending in the X-axis direction and the Y-axis direction, and extend straight in the Y-axis direction.

The inclined surface 216B of the present embodiment is constituted by a part of the concave portion 217B formed in the first restricting piece 210B, and the concave portion 217B is open to the opposing portion 210A of the inner partition plate 2A adjacent in the X-axis direction. Therefore, the opposing portion 210B of the outer partition 2B has a pair of inclined surfaces 216B that are opposed to each other at a distance in the Z-axis direction.

In the X-axis direction, the pair of inclined surfaces 216B are respectively arranged at positions aligned with the respective extension portions 212A of the pair of extension portions 212A of the inner partition plate 2A.

The pair of inclined surfaces 216B are formed so that the distance between them becomes narrower as the distance from the opposing portion 210A of the inner partition plate 2A adjacent in the X-axis direction becomes smaller.

In addition, in the opposing portion 210B of the outer partition plate 2B, the portion on the opening side of the recessed portion 217B in each of the inclined surfaces 216B has a greater distance from each other than the distance (( The contact surfaces 215A are arranged so as to be spaced apart from each other).

Further, in the opposing portion 210B of the outer partition plate 2B, the portions on the bottom surface side of the recessed portion 217B in each of the inclined surfaces 216B of the pair of inclined surfaces 216B are smaller than the pair of extension portions 212A of the inner partition plate 2A at a mutual interval, respectively. It is formed so that the space|interval (the space|interval of 215 A of contact surfaces) may be formed so that the edge parts on the front-end side of 215A may be spaced.

In this embodiment, the holding member 3 is made of metal. As shown in FIG. 4 , the holding member 3 includes a pair of terminal members 30 disposed at positions adjacent to each of the outer partitions 2B, respectively, and frames 31 to which the pair of terminal members 30 are connected, respectively.

Each of the pair of terminal members 30 has a first surface facing the outer partition 2B, and a second surface on the opposite side of the first surface. Each of the pair of terminal members 30 has a crimping portion 300 that is in contact with the base portion 20B of the outer separator 2B.

The terminal member 30 has a first end arranged at a position corresponding to the cover plate 101 of the electric storage element 1 , and a second end opposite to the first end (arranged at a position corresponding to the closing portion 100 a of the electric storage element 1 ) the second end). In addition, the terminal member 30 has a third end arranged at a position corresponding to one of the second walls 100 d of the electrical storage element 1 , and a fourth end (arranged on the other side of the electrical storage element 1 on the opposite side of the third end) the fourth end of the position corresponding to the second wall 100d).

Furthermore, the terminal member 30 has a first corner portion, which is a portion connected with the first end and the third end, and a second corner portion, which is a portion connected with the first end and the fourth end. The terminal member 30 further includes a third corner portion, which is a portion to which the second end and the third end are connected, and a fourth corner portion, which is a portion to which the second end and the fourth end are respectively connected.

Further, the crimping portion 300 has an insertion hole 300a formed at a position corresponding to the shaft portion 23B of the outer partition 2B. The crimping portion 300 further includes a plurality of (four in the present embodiment) through holes 300b formed in each corner portion.

The frame 31 has a first connection portion 310 and a second connection portion 311, the first connection portion 310 extending across the pair of terminal members 30 and disposed at a position corresponding to the cover plate 101 of the power storage element 1, the The second connection portion 311 spans between the pair of terminal members 30 and is arranged at a position corresponding to the closing portion 100 a of the power storage element 1 .

In addition, the frame 31 has a support portion 312 connected to the first connection portion 310 and the second connection portion 311 .

The frame 31 of the present embodiment is formed in a frame shape by connecting the support portion 312 to the first connection portion 310 and the second connection portion 311 . Further, in the power storage device of the present embodiment, there are the first connection portion 310 and the second connection portion 310 on one side of the power storage element arranged in the direction orthogonal to the X-axis direction (hereinafter referred to as the Y-axis direction). The components of the connection part 311 and the support part 312 are used as the first frame 31A, and the parts including the first connection part 310 , the second connection part 311 , and the support part 312 on the other side of the storage element arranged in the Y-axis direction are used as the parts The second frame 31B performs the case described below.

Further, the frame 31 has a fixing portion 313 coupled to the terminal member 30 .

The first connection portion 310 has a first end and a second end opposite to the first end in the longitudinal direction.

In addition, the first connection portion 310 is bent in a direction orthogonal to the longitudinal direction. In the first connection portion 310 , a portion having the bent portion as one of the boundaries is arranged at a position corresponding to the cover plate 101 of the energy storage element 1 . In the first connection portion 310 , a portion having the bent portion as the other boundary is arranged at a position corresponding to the second wall 100 d of the power storage element 1 .

The second connection portion 311 has a first end and a second end on the opposite side of the first end in the longitudinal direction.

The second connection portion 311 is bent in a direction orthogonal to the longitudinal direction. In the second connection portion 311 , a portion with the folded portion serving as one boundary is arranged at a position corresponding to the cover plate 101 of the electric storage element 1 , and the other portion having the folded portion serving as a boundary is arranged at a position corresponding to the electric storage element. The position corresponding to the second wall 100d of 1.

The support part 312 has a first support part 312a and a second support part 312b, the first support part 312a is connected to the first end of the first connection part 310 and the first end of the second connection part 311, the second support part 312b It is connected to the second end of the first connection part 310 and the second end of the second connection part 311 .

The fixing portion 313 includes a pair of first fixing portions 313 a formed at the first and second ends of the first connecting portion 310 , and a pair of second fixing portions 313 b formed at the first and second ends of the second connecting portion 311 . .

One of the first fixing portions 313 a is opposed to the portion around the through hole 300 b of the one of the terminal members 30 . The other first fixing portion 313a faces a portion around the through hole 300b of the other terminal member 30 . Furthermore, the pair of first fixing portions 313a have first hole portions 313c formed at positions corresponding to the through holes 300b, respectively.

Therefore, the first connection portion 310 is connected to the terminal member 30 by screwing the bolt through which the through hole 300b of the terminal member 30 and the first hole portion 313c of the first fixing portion 313a are inserted.

The one second fixing portion 313b faces the portion around the through hole 300b of the one terminal member 30 . The other second fixing portion 313b faces a portion around the through hole 300b of the other terminal member 30 . Furthermore, the pair of second fixing portions 313b are respectively formed with second hole portions 313d at positions corresponding to the through holes 300b.

Therefore, the second connection portion 311 is connected to the terminal member 30 by screwing a bolt through which the through hole 300b of the terminal member 30 and the second hole portion 313d of the second fixing portion 313b are inserted.

The insulator 4 is made of an insulating material. In addition, the insulator 4 includes a pair of first insulating portions 40 arranged between each of the connecting portions 310 of the pair of first connecting portions 310 and the separator 2 (the inner separator 2A and the outer separator 2B), a pair of first insulating portions 40 arranged between the pair of A pair of second insulating portions 41 between each connecting portion 311 of the second connecting portion 311 and the separator 2 (the inner separator 2A and the outer separator 2B).

The long side of the first insulating portion 40 is in the X-axis direction. In addition, the first insulating portion 40 is arranged between the power storage element 1 and the first connection portion 310 of the frame 3 . That is, the first insulating portion 40 is bent in a direction orthogonal to the longitudinal direction. Then, a portion of the first insulating portion 40 whose boundary is the bent portion is in contact with a portion of the first connection portion 310 whose boundary is the bent portion. In addition, in the first insulating portion 40 , a portion of the first insulating portion 40 whose boundary is the folded portion is in contact with the other portion of the first connecting portion 310 whose boundary is the folded portion.

The long side of the second insulating portion 41 is in the X-axis direction. In addition, the second insulating portion 41 is arranged between the power storage element 1 and the second connection portion 311 of the frame 3 . That is, the second insulating portion 41 is bent in a direction orthogonal to the longitudinal direction. In addition, the portion of the second insulating portion 41 having the bent portion as one of the boundaries is in contact with the portion of the second connection portion 311 with the bent portion as one of the boundaries. In addition, in the second insulating portion 41 , a portion of the second insulating portion 41 whose boundary is the folded portion is in contact with the other portion of the first connecting portion 311 whose boundary is the folded portion.

The insulator 4 of this embodiment has two third insulating portions 42 . More specifically, it demonstrates. In the insulator 4, the first end of the first insulating portion 40 and the first end of the second insulating portion 41, and the second end of the first insulating portion 40 and the second end of the second insulating portion 41 pass through the third insulating portion 42 are connected.

As described above, according to the power storage device of the present embodiment, the extending portion 212A of the opposing portion 210A of the internal separator 2A extends to the opposing portion 210A of the internal separator 2A adjacent in the X-axis direction or is opposite to the opposing portion 210A of the internal separator 2A in the X-axis direction. The opposing portion 210B of the adjacent outer partition 2B. Therefore, the extending portion 212A of the inner partition 2A is in contact with the opposing portion 210A of the inner partition 2A adjacent in the X-axis direction or the opposing portion 210B of the outer partition 2B adjacent in the X-axis direction.

In addition, the extending portion 212B of the opposing portion 210B in the outer partition plate 2B extends to the opposing portion 210A of the inner partition plate 2A adjacent in the X-axis direction. Therefore, the extending part 212B of the opposing part 210B of the outer partition plate 2B is in contact with the opposing part 210A of the inner partition plate 2A adjacent in the X-axis direction.

As a result, the flow will flow between the opposing portions 210A of the inner separators 2A adjacent in the X-axis direction, and between the opposing portions 210A of the inner separators 2A and the outer separators 2B that are adjacent in the X-axis direction. The cooling air between 210B is blocked by the extending portion 212A of the opposing portion 210A of the inner partition plate 2A and the extending portion 212B of the opposing portion 210B of the outer partition plate 2B.

Therefore, in the power storage device, the air moves from the end edge on the side of the ventilation passages 203A and 202B of the opposing portion 210A of each separator 2 to the side opposite to the side of the ventilation passages 203A and 202B of the opposing portion 210A of each separator 2 . The flow of the end edge is obstructed. Accordingly, in the power storage device, the cooling air supplied to the ventilation passages 203A and 202B formed between the power storage elements 1 is less likely to leak to the outside.

In addition, in the power storage device of the present embodiment, the extension portion 212A of the inner separator 2A and the inclined surface 216A of the inner separator 2A are in contact with each other, and the inclination of the extension portion 212A of the inner separator 2A and the outer separator 2B The portions where the surfaces 216B meet are inclined with respect to the Z-axis direction, respectively.

Therefore, in the power storage device, air can be effectively blocked from the end edges on the ventilation passages 203A and 202B side of the opposing portion 210A of each separator 2 toward the ventilation passages 203A and 202B of the opposing portion 210A of each separator 2 . The flow of the edge on the opposite side of the side.

Moreover, the extension part 212A of the opposing part 210A of the inner partition plate 2 and the extension part 212B of the opposing part 210B of the outer partition plate 2B have elasticity. Therefore, in the power storage device, even if the interval between the opposing portions 210A of the internal separator 2A or the interval between the opposing portions 210A of the internal separator 2A and the opposing portion 210B of the external separator 2B changes due to manufacturing errors or the like If it is narrow, the fluctuation of the interval can be absorbed by elastic deformation of the extending portion 212A of the opposing portion 210A of the inner separator 2A or elastic deformation of the extending portion 212B of the opposing portion 210B of the outer separator 2B.

In this way, in the power storage device, even if the interval between the opposing portions 210A of the internal separator 2A or the interval between the opposing portions 210A of the internal separator 2A and the opposing portion 210B of the external separator 2B changes due to manufacturing errors or the like Narrow, the extended portion 212A of the internal partition 2A and the opposing portion 210A of the internal partition 2A or the opposing portion 210B of the external partition 2B can be maintained, and the extended portion 212B of the external partition 2B and the internal partition can be maintained. The state in which the opposing portion 210A of 2A is in contact with each other.

Furthermore, in the opposing portion 210A of each internal partition 2A, the pair of inclined surfaces 216A are formed so that the distance between them becomes narrower as they gradually become the bottom surface side of the recessed portion 217A. Therefore, the distance between the opposing portion 210A of the inner partition plate 2A and the opposing portion 210A of the other inner partition plate 2A adjacent to the other side in the X-axis direction, or the distance between the opposing portion 210B of the outer partition plate 2B, is changed. The narrower it is, the more the pair of extension parts 212A of the inner partition plate 2A or the pair of extension parts 212B of the outer partition plate 2B are elastically deformed so that the distance between the front ends of each other is narrowed.

In addition, in the opposing portion 210B of the other outer partition 2B, the pair of inclined surfaces 216B is formed so that the distance between each other becomes narrower as it gradually becomes the bottom surface side of the recessed portion 217B. Therefore, as the interval between the opposing portion 210B of the other outer partition 2B and the opposing portion 210A of the other inner partition 2A adjacent to the other in the X-axis direction becomes narrower, a pair of inner partitions 2A The extension parts 212A are elastically deformed so that the distance between the front ends of each other becomes narrower.

Therefore, in the power storage device, as the interval between the opposing portion 210A of the inner separator 2A and the opposing portion 210B of the outer separator 2B narrows, the extending portion 212A of the inner separator 2A, the outer separator 212A of the inner separator 2A and the outer separator are restored to the interval as the interval becomes narrower. The force of the extension 212B of the plate 2B becomes stronger. Therefore, the power storage device is in a state corresponding to the state where the separators 2 adjacent to each other in the X-axis direction are connected by the elastic body, and the resistance to vibration is improved.

Furthermore, the opposing portion 210A of the internal partition 2A includes a plurality of (two in the present embodiment) extension portions 212A.

Therefore, in the power storage device, the flow of air between the pair of opposing portions 210A from the end edge of the opposing portion 210A on the side of the ventilation passage 203A toward the end edge on the opposite side of the ventilation passage 203A is blocked by the flow of the internal separator 2A. Two extensions 212A get in the way. Thereby, leakage of the cooling air to the outside of the power storage device through the pair of opposing portions 210A can be more effectively suppressed.

In addition, the opposing portion 210B of the outer partition 2B includes a plurality of (two in the present embodiment) extension portions 212B.

Therefore, in the power storage device, air travels between the opposing portion 210B of the outer separator 2B and the opposing portion 210A of the inner separator 2A from the end edge of the opposing portion 210B on the ventilation passage 202B side toward the air passage 202B. The flow of the end edge on the opposite side is blocked by the plurality of extension portions 212B of the outer partition 2B. This can more effectively prevent the cooling air from leaking to the outside of the power storage device through between the opposing portion 210B of the outer separator 2B and the opposing portion 210A of the inner separator 2A.

Further, a pair of adjacent opposing portions 210A in each of the inner partition plates 2A defines a gap extending in the Z-axis direction.

Thereby, the relative position of the pair of opposing portions 210A in the X-axis direction can be changed in accordance with the expansion or contraction of the electrical storage element 1 .

In addition, the holding member 3 that holds the storage element 1 and the internal separator 2A as a whole has a frame 31 extending in the X-axis direction in which the pair of opposing portions 210A face each other, and is arranged at right angles to the X-axis One side of the power storage element 1 in the direction (Y-axis direction or Z-axis direction). The pair of opposing portions 210A are sandwiched between the storage element 1 and the frame 31 in a direction orthogonal to the X axis (the Y axis direction or the Z axis direction). Furthermore, the extending portion 212A and the inclined surface 216A of the opposing portion 210A are sandwiched between the storage element 1 and the frame 31 in the direction orthogonal to the X axis (the Y axis direction or the Z axis direction).

As a result, the pair of opposing portions 210A, the extending portion 212A, and the inclined surface 216A are protected from physical contact from the outside. As a result, it is possible to suppress the release of the contact state between the extension portion 212A and the inclined surface 216A due to physical contact.

In addition, the power storage device includes the insulator 4 disposed between the power storage element 1 and the frame 31, and the pair of opposing portions 210A are sandwiched between the power storage element 1 and the frame 31 in a direction orthogonal to the X-axis direction (the Y-axis direction or the Z-axis direction). Between the electrical element 1 and the insulator 4 . Further, the extending portion 212A and the inclined surface 216A of the opposing portion 210A are sandwiched between the storage element 1 and the insulator 4 in a direction orthogonal to the X axis (the Y axis direction or the Z axis direction).

Accordingly, even if stress is applied from the outside, the pair of opposing portions 210A, the extending portion 212A, and the inclined surface 216A can be buffered by the insulator. As a result, it is possible to suppress the release of the contact state between the extension portion 212A and the inclined surface 216A.

The power storage device of the above-described embodiment includes:

At least one electric storage element 1 is formed in a rectangular cylindrical shape, and has a pair of first walls 100c and a pair of second walls 100d, the pair of first walls 100c are opposed to each other in the X-axis direction, and the pair of second walls 100d sandwiches opposite to a pair of first walls 100c;

The first separator (internal separator 2A or external separator 2B), which is a first separator (internal separator 2A or external separator 2B) adjacent to the storage element 1 in the X-axis direction, and which is adjacent to the X-axis direction In the orthogonal Y-axis direction, a ventilation path through which cooling air can flow is formed between it and the storage element 1;

the second separator (the inner separator 2A or the outer separator 2B), which adjoins the first separator with the storage element 1 sandwiched therebetween;

The first separator has a first opposing portion 210A facing the second separator in the X-axis direction, and the second separator has a first opposing portion (the inner separator 2A of the inner separator 2A) facing the first separator in the X-axis direction. the opposing portion 210A or the opposing portion 210B of the outer partition 2B) opposing the second opposing portion (the opposing portion 210A of the inner partition 2A or the opposing portion 210B of the outer partition 2B),

The first opposing portion has an extension extending toward the second opposing portion (the extension 212A of the inner partition 2A or the extension 212B of the outer partition 2B),

The extending portion is in contact with the second opposing portion.

As a result, in the power storage device, between the opposing portions 210A of the inner separators 2A adjacent in the X-axis direction, the opposing portions 210A of the inner separators 2A adjacent to the X-axis direction are separated from the outside. The cooling air between the opposing portions 210B of the plate 2B is blocked by the extending portion 212A of the opposing portion 210A of the inner partition 2A or the extending portion 212B of the opposing portion 210B of the outer partition 2B.

FIG. 11 and FIG. 12 show a state in which the duct 6 is attached to the power storage device 1 . In the power storage device 1 of the present embodiment, since an exhaust fan (not shown) is installed in the duct 6 , the cooling air flows between the adjacent power storage elements 1 through the paths indicated by the arrows in FIG. 11 . Here, when the extension portion and the second opposing portion are not in contact with each other, the cooling air may flow between the pair of opposing portions through the path indicated by the arrow in FIG. 12 . Specifically, in the above-described embodiment, since the sealing member 5 is arranged between the frame 31 and the duct 6 , there is almost no cooling air passing between the frame 31 and the duct 6 . On the other hand, when the extension part and the second opposing part are not in contact with each other, as shown by the arrow in FIG. 12 , the cooling air may pass through the pair of opposing parts sandwiched between the power storage element 1 and the frame 31 . flow between. Therefore, it is possible to obtain a state in which a part of the fluid taken in by the exhaust fan does not pass between the power storage elements 1 . In the above-described embodiment, when the extension portion is in contact with the second opposing portion, the cooling air that can flow between the pair of opposing portions can be blocked.

In addition, the second opposing portion has a concave portion, and the extension portion only needs to be in contact with the inner surface of the concave portion. The power storage device of the present embodiment has a recessed portion 217A formed in each of the inner separators 2A, and a recessed portion 217B formed in the other outer separator 2B. As shown in FIG. 7 , the concave portion 217A of the inner partition 2A is defined by a pair of inclined surfaces 216A and a bottom portion connecting the pair of inclined surfaces 216A. As shown in FIG. 9 , the concave portion 217B of the outer partition 2B is defined by a pair of inclined surfaces 216B and a bottom portion connecting the pair of inclined surfaces 216B.

Thereby, the part where the extension part contacts is accommodated in the recessed part, and therefore it is possible to suppress the release of the contact state between the extension part and the inner surface of the recessed part due to physical contact from the outside.

In this case, the extension portion may be in contact with the inner surface of the recessed portion in the Z-axis direction.

Accordingly, even when the pair of opposing portions is displaced in the X-axis direction due to expansion or contraction of the storage element 1, it is possible to suppress a change in the contact state between the extension portion and the inner surface of the recessed portion.

In addition, the first opposing portion has a plurality of extension portions, and each of the plurality of extension portions may be in contact with the inner surface of the recessed portion.

Thereby, the cooling air which can flow through between a pair of opposing parts can be blocked effectively.

The plurality of extension parts are arranged at intervals in the Z-axis direction, and define a gap extending in the X-axis direction.

In the power storage device of the present embodiment, each of the inner separators 2A has a pair of extension portions 212A, and one of the outer separators 2B has a pair of extension portions 212B. The pair of extension parts 212A are arranged at intervals in the Z-axis direction, and define a gap along the X-axis direction. In addition, among the pair of extension parts 212A, the extension part 212A arranged on the upper side in the Z-axis direction is in contact with the inner surface of the recessed part on the upper side of the extension part 212A, and the extension part 212A of the pair of extension parts 212A is arranged on the lower side in the Z-axis direction. The side extension portion 212A is in contact with the inner surface of the concave portion on the lower side of the extension portion 212A. The pair of extension parts 212A define a gap extending in the X-axis direction, and when the pair of extension parts 212A contact the inner surface of the recess in the Z-axis direction, displacement can be generated in the defined gap. As a result, the stress generated in the pair of extension portions 212A can be relieved by the gap. The same effect can be obtained even in the pair of extension parts 212B of the outer partition 2B.

In addition, in the X-axis direction, a gap may be defined between the front end portion of the extending portion and the inner surface of the recessed portion.

Thereby, the relative positions of the extending portion and the recessed portion in the X-axis direction can be changed in accordance with the expansion or contraction of the electrical storage element 1 .

Further, the first opposing portion and the second opposing portion may define a gap extending in the Z-axis direction.

Thereby, the relative positions of the first opposing portion and the second opposing portion in the X-axis direction can be changed in accordance with the expansion or contraction of the electrical storage element 1 .

In addition, the holding member that holds the storage element, the first separator, and the second separator as a whole extends in the X-axis direction and is arranged in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis direction. on the frame on one side of the storage element,

In the direction orthogonal to the X-axis direction (the Y-axis direction or the Z-axis direction), the first opposing portion and the second opposing portion may be sandwiched between the storage element and the frame.

Thereby, the first opposing portion and the second opposing portion are protected from physical contact from the outside. As a result, it is possible to suppress the release of the contact state between the extension portion and the second opposing portion due to physical contact.

The power storage device of the present embodiment further includes an insulator disposed between the power storage element and the frame, and the first opposing portion and the second opposing portion are arranged in a direction orthogonal to the X-axis direction (Y-axis direction or Z-axis direction). The portion may be sandwiched between the storage element and the insulator.

Thereby, even if stress is applied from the outside, the first opposing portion and the second opposing portion can be buffered by the insulator. As a result, it is possible to suppress the release of the contact state between the extension portion and the second opposing portion.

In addition, the power storage device of the present invention is not limited to the above-described one embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

In the above-described embodiment, the base portion 20A of the internal separator 2A has a substantially rectangular shape, and its size is substantially the same as that of the first wall 100 c of the electric storage element 1 . However, the base portion 20A of the internal separator 2A is not limited to a substantially rectangular shape as long as it can correspond to the respective postures of the two adjacent power storage elements 1 , and is not limited to a substantially rectangular shape, nor is it limited to be substantially in line with the first wall 100 c of the power storage element 1 . equivalent size.

In the above-described embodiment, the base portion 20A of the internal separator 2A has a rectangular wave shape to form the ventilation passage 203A between the base portion 20A and the storage element 1 . However, as long as the base portion 20A of the internal separator 2A can pass the fluid between the first surface and the storage element 1 (between the second surface and the storage element 1 ), the shape of the base portion 20A is not limited to a rectangular wave shape. . In addition, when the ventilation passage 203A does not need to be formed between the base 20A of the internal separator 2A and the storage element 1 , the base 20A of the internal separator 2A may be formed in a flat plate shape.

In the above-described embodiment, each restricting portion 21A of the internal partition 2A is formed as each corner portion of the base portion 20A. However, the restricting portion 21A of the internal separator 2A is not limited to the position formed in the base portion 20A as long as the position of the storage element 1 relative to the base portion 20A can be determined.

In the above-described embodiment, the base portion 20B of the outer separator 2B has a substantially rectangular shape, and its size is substantially equal to that of the first wall 100 c of the electrical storage element 1 . However, the base portion 20B only needs to be able to correspond to the posture of the adjacent electric storage element 1 and the posture of the termination member 30 , and the base portion 20B is not limited to a substantially rectangular shape, nor is it limited to a substantially rectangular shape, nor is it limited to be substantially in line with the first wall 100 c of the electric storage element 1 . equivalent size.

In the above-described embodiment, the restricting portion 21B is formed at each corner portion of the base portion 20B of the outer partition 2B. However, the restricting portion 21B is not limited to the position formed in the base portion 20B as long as the position where the storage element 1 is arranged relative to the base portion 20B can be determined.

In the above-described embodiment, the opposing portion 210A of the internal partition 2A includes the pair of extending portions 212A, but the present invention is not limited to this. For example, the opposing portion 210A of the internal partition 2A may include one extension portion 212A or three or more extension portions 212A. The opposing portion 210A of the internal partition 2A may further include a plurality of pairs of extension portions 212A.

Moreover, although the opposing part 210B of the outer partition 2B is provided with a pair of extension part 212B, it is not limited to this. For example, the opposing portion 210B of the outer partition 2B may include one extension portion 212B or three or more extension portions 212B. The opposing portion 210B of the outer partition 2B may further include a plurality of pairs of extension portions 212B.

In the above-described embodiment, the inclined surface 216A of the inner partition plate 2A is inclined with respect to the respective directions of the X-axis direction and the Z-axis direction, but the present invention is not limited thereto. The inclined direction of the inclined surface 216A of the inner partition plate 2A is not particularly limited as long as it can contact the extension part 212A of the inner partition plate 2A or the extension part 212B of the outer partition plate 2B.

In addition, in the above-described embodiment, the inclined surface 216B of the outer partition 2B is inclined with respect to the respective directions of the X-axis direction and the Z-axis direction, but the present invention is not limited to this. The inclined direction of the inclined surface 216B of the outer partition plate 2B is not particularly limited as long as it can contact the extension portion 212A of the inner partition plate 2A.

In the above-described embodiment, the extension portion 212A of the inner partition plate 2A is configured to abut on the inclined surface 216A of the inner partition plate 2A, but the present invention is not limited thereto. For example, the extension portion 212A of the inner partition plate 2A may be configured such that its front end portion contacts the opposing portion 210A (the bottom surface of the recessed portion 217A) of the inner partition plate 2A in the X-axis direction.

Even in this case, since the extending portion 212A of the inner partition plate 2A is in contact with the opposing portion 210A, cooling air is less likely to leak from between the opposing portions 210A of the inner partition plate 2A adjacent in the X-axis direction.

Moreover, although the extension part 212B of the outer partition 2B is also comprised so that it may contact|abut with the inclined surface 216A of 2 A of inner partitions, it is not limited to this. For example, the extending portion 212B of the outer partition 2B may be configured such that its front end portion contacts the opposing portion 210A (the bottom surface of the recess 217A) of the inner partition 2A in the X-axis direction.

Even so, since the extending portion 212B of the outer partition 2B is in contact with the opposing portion 210A of the inner partition 2A, it is difficult for cooling air to pass from the opposing portion 210B of the outer partition 2B and the opposing portion 210A of the inner partition 2A. leaks.

In the above-described embodiment, the inclined surfaces 216A of the internal partitions 2A are inclined with respect to the X-axis direction and the Z-axis direction, respectively, but the present invention is not limited thereto. For example, the inclined surface 216A of the inner partition 2A may be constituted by a flat surface extending in the X-axis direction and the Y-axis direction at the part contacting the extension 212A of the inner partition 2A or the extension 212B of the outer partition 2B.

That is, the inclined surface 216A of the inner separator 2A may be in contact with the extension portion 212A of the inner separator 2A or the extension portion 212B of the outer separator 2B, and may be orthogonal to the Z-axis direction.

Furthermore, in the above-described embodiment, the inclined surfaces 216B of the outer partition 2B are inclined with respect to the X-axis direction and the Z-axis direction, respectively, but the present invention is not limited thereto. For example, the inclined surface 216B of the outer partition 2B may be formed of a flat surface extending in the X-axis direction and the Y-axis direction at the portion in contact with the extension portion 212A of the inner partition 2A.

That is, the inclined surface 216A of the inner partition plate 2A only needs to be in contact with the extension portion 212A of the inner partition plate 2A, and may not be inclined with respect to the X-axis direction and the Z-axis direction.

In the above-described embodiment, the extension portion 212A of the inner partition 2A has elasticity, but it is not limited thereto. For example, the extension portion 212A of the inner partition 2A may not have elasticity.

In the above-described embodiment, the contact surface 215A of the extension portion 212A of the inner partition plate 2A is bent at the halfway position in the X-axis direction, but the present invention is not limited to this. For example, the extension portion 212A of the internal partition 2A may be inclined with respect to the X-axis direction and the Z-axis direction, respectively, over the entirety. That is, the contact surface 215A of the extension part 212A of the internal partition 2A may be constituted only by the inclined surface 216A.

In the above-described embodiment, in the extension portion 212B of the outer partition plate 2B, the contact surface 215B is bent at an intermediate position in the X-axis direction, but the present invention is not limited to this. For example, the extension part 212B of the outer partition 2B may be inclined with respect to the X-axis direction and the Z-axis direction, respectively, over the entirety. That is, the contact surface 215B of the extension part 212B of the outer partition 2B may be constituted only by the inclined surface 216B.

In the above-described embodiment, although not particularly mentioned, the opposing portion 210A of the internal partition 2A may be configured to be in contact with the inclined surface 213A of the extending portion 212A. In addition, the opposing portion 210A of the inner partition 2A is preferably configured such that the inclined surface 213A of the extending portion 212A and the inclined surface 216A of the inner partition 2A adjacent in the X-axis direction (or the outer partition 2B adjacent in the X-axis direction) The inclined surfaces 216B) of the two parts meet each other.

In addition, the opposing portion 210B of the outer partition 2B may be configured to be in contact with the inclined surface 213B of the extending portion 212B. Moreover, it is preferable that the opposing part 210B of the outer partition plate 2B is comprised so that the inclined surface 213B of the extension part 212B and the inclined surface 216A of 2 A of inner partition plates adjacent in the X-axis direction mutually contact.

In this way, the extending portion 212B of the outer partition 2B is in contact with the inclined surface 216A so that the contact portion of the inclined surface 213B of the extending portion 212B and the opposing portion 210A of the internal partition 2A extends in a direction intersecting the Z-axis direction. Thereby, the flow of air between the opposing portions 212B and 210A from the end edge on the ventilation passage 203A side of the opposing portion 210A toward the end edge on the opposite side of the ventilation passage 203A can be more effectively inhibited.

In addition, the inclined surface 213A of the extension portion 212A and the inclined surface 216A of the inner partition plate 2A adjacent in the X-axis direction (or the inclined surface 216B of the outer partition plate 2B adjacent in the X-axis direction) are brought into contact with each other, so that When the inclined surface 216B of the extending portion 212B in the opposing portion 210B of the outer partition 2B and the inclined surface 216A of the inner partition 2A adjacent in the X-axis direction are in contact with each other, the inclined surfaces 213A, 216B and the inclined surfaces The extension portion (first inclined surface) is in contact with the other opposing portion 210A (second inclined surface) so that the contact portion of 216A extends in a direction intersecting the second direction. Thereby, the flow of air between the opposing portions 210A from the end edge on the ventilation passage 203A side of the opposing portion 210A toward the end edge on the opposite side of the ventilation passage 203A can be more effectively inhibited.

In this case, as shown in FIG. 10 , the inclined surface 213A in the extended portion 212A of the inner partition plate 2A and the inclined surface 216A of the inner partition plate 2A adjacent in the X-axis direction (or the outside adjacent in the X-axis direction) The angle α formed by the inclined surfaces 216B) of the separator 2B is preferably configured to be 0°<α.

In addition, the angle α formed by the inclined surface 213B of the extension portion 212B of the outer partition plate 2B and the inclined surface 216A of the inner partition plate 2A adjacent in the X-axis direction is preferably configured to be 0°<α.

When the inclined surfaces 212A and 213B are parallel to the inclined surface 216A, there is a possibility that a gap may be generated between the inclined surfaces 212A and 213B and the inclined surface 216A due to a manufacturing error at the time of manufacturing the separator. However, as long as the angle α is larger than 0° as described above, that is, the first inclined surfaces 212A and 213B and the inclined surface 216A are not parallel to each other, it is possible to prevent the occurrence of the gap due to the manufacturing error.

Further, the inclined surface 213A in the extension portion 212A of the inner partition plate 2A and the inclined surface 216A of the inner partition plate 2A adjacent in the X-axis direction (or the inclined surface 216B of the outer partition plate 2B adjacent in the X-axis direction) The formed angle α is more preferably configured to satisfy 0°<α≦15°.

Further, the angle α formed by the inclined surface 213B of the extension portion 212B of the outer partition 2B and the inclined surface 216A of the inner partition 2A adjacent to the X-axis direction is more preferably 0°<α≦15°.

In the above-described embodiment, although not particularly mentioned, preferably, the extending portion 212A of the inner partition 2A extends from one end in the Y-axis direction of the inclined surface 216A of the inner partition 2A or the inclined surface 216B of the outer partition 2B to The other end on the opposite side of the one end is in contact with each other.

In addition, it is preferable that the extension part 212B of the outer partition 2B spans the other end on the opposite side of the one end from one end in the Y-axis direction of the inclined surface 216A of the inner partition 2A and is in contact with the other end.

In the above-described embodiment, the extending portion 212A of the inner partition 2A is in contact with a part of the inclined surface 216A of the inner partition 2A or a part of the inclined surface 216B of the outer partition 2B, but it is not limited thereto. For example, the extended portion 212A of the inner partition 2A may be in contact with the entire area of the inclined surface 216A of the inner partition 2A or the entire area of the inclined surface 216B of the outer partition 2B.

In this way, in the entire area between the opposing portions 210A in the flow direction of the cooling air, it is possible to prevent air from passing between the opposing portions 210A from the edge of the opposing portion 210A on the ventilation passage 203A side toward the ventilation passage 203A the flow of the end edge on the opposite side. Thereby, leakage of cooling air to the outside of the power storage device through between the pair of opposing portions 210A can be more effectively suppressed.

In the above-described embodiment, the exhaust fan that reduces the pressure in the duct 6 to generate the flow of the fluid is attached, but an intake fan that increases the pressure in the duct 6 to generate the flow of the fluid may be attached.

Claims (18)

1. An electricity storage device is characterized by comprising:

at least one electric storage element;

a separator that is adjacent to the power storage element and forms an air passage through which cooling air can flow between the separator and the power storage element;

the separator has an opposing portion that faces the air passage and is adjacent to the power storage element in a direction in which the cooling air flows in the air passage, the opposing portion facing the separator adjacent to the power storage element with the power storage element interposed therebetween,

one opposing portion of a pair of opposing portions of the separators disposed on both sides of the electricity storage element that oppose each other has an extending portion that extends toward the other opposing portion of the pair of opposing portions,

the other opposing portion has a pair of inclined surfaces inclined with respect to a first direction in which the pair of opposing portions face each other and a second direction orthogonal to a flow direction of the cooling air,

the extension part is connected with at least one part of the inclined surface,

the extension portion is elastically deformable by contact with the inclined surface,

the pair of inclined surfaces are opposed to each other with a space therebetween in the second direction, and the space is narrowed as being apart from the one opposed portion in a direction in which the pair of opposed portions are opposed to each other,

the one opposing portion has a pair of the extending portions at positions opposing the pair of inclined surfaces,

the pair of extending portions are arranged at an interval in the second direction, and the interval between the leading ends of the pair of extending portions is smaller than the interval between the inclined surfaces at the end portion of the pair of inclined surfaces on the one opposing portion side and is larger than the interval between the inclined surfaces at the end portion of the pair of inclined surfaces on the opposite side of the one opposing portion side.

2. The power storage device according to claim 1,

the one opposing portion has a plurality of the extension portions,

the other opposing portion has the inclined surfaces in a number corresponding to the plurality of the extending portions.

3. The power storage device according to claim 1,

the extension portion has an inclined surface inclined with respect to a first direction in which the pair of opposing portions face each other and a second direction orthogonal to a flow direction of the cooling air,

the other opposing portion is in contact with at least a part of the inclined surface of the extending portion.

4. The power storage device according to claim 1,

the extension portion has a first inclined surface inclined with respect to a first direction in which the pair of opposing portions face each other and a second direction orthogonal to a flow direction of the cooling air,

the other opposing portion has a second inclined surface inclined with respect to a first direction in which the pair of opposing portions oppose each other and a second direction orthogonal to the flow direction of the cooling air,

the first inclined surface is connected to at least a part of the second inclined surface.

5. The power storage device according to claim 4,

the angle α of the second inclined surface with respect to the first inclined surface is: alpha is less than 0 degree.

6. The power storage device according to any one of claims 1 to 5,

the extension portion is in contact with the other opposing portion over an entire region of the other opposing portion in a flow direction of the cooling air.

7. The power storage device according to any one of claims 1 to 5,

the pair of opposing portions define a gap extending in a first direction in which the pair of opposing portions face each other and a second direction orthogonal to a flow direction of the cooling air.

8. The power storage device according to any one of claims 1 to 5, comprising:

a holding member that integrally holds the electricity storage element and the separator,

the holding member has a frame extending in a first direction in which the pair of opposing portions face each other and arranged on one side of the power storage element in a direction orthogonal to the first direction,

the pair of opposing portions are sandwiched between the electrical storage element and the frame in a direction orthogonal to the first direction.

9. The power storage device according to claim 8, comprising:

an insulator disposed between the electricity storage element and the frame,

the pair of opposing portions is sandwiched between the power storage element and the insulator in a direction orthogonal to the first direction.

10. An electricity storage device is characterized by comprising:

at least one electricity storage element formed in a rectangular tube shape, the electricity storage element having a pair of first walls facing each other in a first direction and a pair of second walls facing each other with the pair of first walls interposed therebetween;

a first separator that is adjacent to the power storage element in the first direction and forms an air passage through which cooling air can flow between the power storage element and the first separator in a second direction orthogonal to the first direction;

a second separator adjacent to the first separator with the power storage element interposed therebetween;

the first separator has a first opposing portion opposing the second separator in the first direction, the second separator has a second opposing portion opposing the first opposing portion of the first separator in the first direction,

the first opposing portion has an extension portion extending toward the second opposing portion,

the second opposing portion has a pair of inclined surfaces inclined with respect to a first direction in which the first opposing portion and the second opposing portion are opposed to each other and a second direction orthogonal to a flow direction of the cooling air,

the extension part is connected with at least one part of the inclined surface,

the extension portion is elastically deformable by contact with the inclined surface,

the pair of inclined surfaces are opposed to each other with a gap therebetween in the second direction, and the gap is narrowed with the distance from the first opposed portion in the first direction,

the first opposing portion has a pair of the extending portions at positions opposing the pair of inclined surfaces,

the pair of extending portions are arranged at an interval in the second direction, and the interval between the leading ends of the pair of extending portions is smaller than the interval between the inclined surfaces at the end portions of the pair of inclined surfaces on the first opposing portion side and is larger than the interval between the inclined surfaces at the end portions of the pair of inclined surfaces on the opposite side of the first opposing portion side.

11. The power storage device according to claim 10,

the second opposing portion has a concave portion,

the extension portion meets an inner surface of the recess portion.

12. The power storage device according to claim 11,

the extension portion is in contact with an inner surface of the recess portion in a third direction orthogonal to the first direction and the second direction.

13. The power storage device according to claim 11,

the first opposing portion has a plurality of the extension portions,

the plurality of extending portions are respectively in contact with the inner surfaces of the recessed portions.

14. The power storage device according to claim 13,

the plurality of extending portions are arranged at intervals in a third direction orthogonal to the first direction and the second direction, and define a gap extending in the first direction.

15. The power storage device according to any one of claims 11 to 14,

in the first direction, a front end portion of the extension portion and an inner surface of the recess define a gap.

16. The power storage device according to any one of claims 10 to 14,

the first and second opposing portions define a gap extending in a third direction orthogonal to the first and second directions.

17. The power storage device according to any one of claims 10 to 14, comprising:

a holding member that holds the electricity storage elements, the first separator, and the second separator as a whole,

the holding member has a frame extending in the first direction and disposed on one side of the power storage element in a direction orthogonal to the first direction,

the first and second opposing portions are sandwiched between the power storage element and the frame in a direction orthogonal to the first direction.

18. The power storage device according to claim 17, comprising:

an insulator disposed between the electricity storage element and the frame,

the first and second opposing portions are sandwiched between the power storage element and the insulator in a direction orthogonal to the first direction.

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