CN106953134B - Electricity storage device - Google Patents

Electricity storage device Download PDF

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Publication number
CN106953134B
CN106953134B CN201610908003.4A CN201610908003A CN106953134B CN 106953134 B CN106953134 B CN 106953134B CN 201610908003 A CN201610908003 A CN 201610908003A CN 106953134 B CN106953134 B CN 106953134B
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China
Prior art keywords
power storage
pair
opposing
separator
portions
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CN201610908003.4A
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Chinese (zh)
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CN106953134A (en
Inventor
西村洋介
岁冈芳昌
川田政夫
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Honda Motor Co Ltd
GS Yuasa International Ltd
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Honda Motor Co Ltd
GS Yuasa International Ltd
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Publication of CN106953134A publication Critical patent/CN106953134A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present invention relates to an electrical storage device in which cooling air for supplying to an air passage formed between electrical storage elements is less likely to leak to the outside. In the present embodiment, the power storage device includes: 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 opposing portions opposing the separator adjacent to the electricity storage element with the electricity storage element interposed therebetween, one of a pair of opposing portions of the intermediate member disposed on both sides of the electricity storage element, the opposing portion facing the other of the pair of opposing portions, and the extending portion is in contact with the other opposing portion.

Description

Electricity storage device
Technical Field
The present invention relates to an electric storage device including an electric storage element.
Background
Since a large-capacity power supply is necessary for various devices such as an electric vehicle, a power storage device including a plurality of power storage elements is used. As shown in fig. 13 to 15, this power storage device includes: an energy storage element 50, and a separator 51 adjacent to the energy storage element 50. The separators 51 are provided with the power storage elements 50 on both sides thereof, and form ventilation paths 510 through which cooling air can flow between the adjacent power storage elements 50. Moreover, at a position facing air passage 510 and at a position near power storage element 50 in the direction of flow of cooling air in air passage 510 formed between adjacent power storage elements 50, separator 51 has an opposing portion that opposes adjacent separator 51 across power storage element 50.
In this electricity storage element 5, a gap 514 is formed between facing portions 511 of the separators 51 disposed on both sides of the electricity storage element 50, and this gap 514 extends from an end edge 512 of the facing portion 511 on the side of the air passage 510 to an end edge 513 on the opposite side of the air passage 510. Therefore, when cooling air for cooling the power storage element 50 is supplied to the air passage 510, a part of the cooling air leaks from the air passage 514 to the outside of the power storage device 5 through the gap, whereby the cooling effect of the power storage element 50 in the power storage device 5 is reduced.
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent application publication No. 2010-157450
Disclosure of Invention
Problems to be solved by the invention
In view of the above problems, an object of the present invention is to provide an electric storage device in which cooling air supplied to an air passage formed between electric storage elements is less likely to leak to the outside.
Means for solving the problems
The power storage device of the present invention 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 extension portion is contiguous with the other opposing portion.
According to this configuration, the extending portion extending from the one opposing portion to the other opposing portion between the pair of opposing portions can block the flow of air from the end edge on the air passage side of the opposing portion toward the end edge on the opposite side of the air passage between the opposing portions. This can suppress leakage of cooling air to the outside of the power storage device through between the pair of opposing portions.
In the electrical storage device, optionally,
the other opposing 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 extension is contiguous with at least a portion of the inclined surface.
According to this configuration, the extending portion is in contact with the inclined surface such that a contact portion of the extending portion and the inclined surface extends in a direction intersecting the second direction. This can more effectively block the flow of air between the facing portions from the end edge on the air passage side of the facing portions toward the end edge on the opposite side of the air passage.
In the electrical storage device, it is preferable that,
the extension portion is elastically deformable by contact with the inclined surface.
According to this configuration, since the extending portion can be elastically deformed along the inclined surface, even if the interval between the opposing portions is narrowed due to a manufacturing error or the like, the variation in the interval can be absorbed by the elastic deformation. That is, even if the interval between the opposing portions becomes narrow due to a manufacturing error or the like, the extending portion can be elastically deformed along the abutting surface, and the state of contact with the inclined surface can be maintained.
In the electrical storage device, it is preferable that,
the other opposing portion has a pair of the inclined surfaces,
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.
According to this configuration, the distance between the pair of extending portions is elastically deformed so as to be narrower as the distance between the opposing portions becomes narrower, and the distance between the distal ends of the pair of extending portions is narrower by the pair of inclined surfaces, so that the urging force for restoring the distance between the opposing portions is increased. In this way, the adjacent separators are in a state equivalent to being coupled by the elastic body, and therefore resistance to vibration in the power storage device is improved.
In the electrical storage device, optionally,
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.
According to this configuration, the plurality of extending portions can block the flow of air between the pair of opposing portions from the end edge on the air passage side of the opposing portion toward the end edge on the opposite side of the air passage. This can more effectively suppress leakage of the cooling air to the outside of the power storage device through between the pair of opposing portions.
In the electrical storage device, a first electrical storage device,
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.
According to this configuration, the extending portion is in contact with the inclined surface such that a contact portion between the inclined surface of the extending portion and the opposing portion extends in a direction intersecting the second direction. This can more effectively block the flow of air between the facing portions from the end edge on the air passage side of the facing portions toward the end edge on the opposite side of the air passage.
In the electrical storage device, optionally,
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.
According to this configuration, the extending portion (first inclined surface) is in contact with the other opposing portion (second inclined surface) such that a contact portion of the first inclined surface and the second inclined surface extends in a direction intersecting the second direction. In this case, the air flow between the facing portions from the end edge on the air passage side of the facing portions to the end edge on the opposite side of the air passage can be more effectively blocked.
In the power storage device, when the first inclined surface and the second inclined surface are provided, it is preferable that,
the angle α of the second inclined surface with respect to the first inclined surface satisfies: alpha is less than 0 degree.
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, according to the above configuration, if the angle α is larger than 0 °, that is, if the first inclined surface and the second inclined surface are not parallel to each other, it is possible to prevent the generation of the gap due to the manufacturing error.
In the electrical storage device, it is preferable that,
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.
According to this configuration, the flow of air between the facing portions from the end edge on the air passage side of the facing portions toward the end edge on the opposite side of the air passage can be blocked over the entire region between the facing portions in the flow direction of the cooling air. This can more effectively suppress leakage of the cooling air to the outside of the power storage device through between the pair of opposing portions.
Effects of the invention
As described above, according to the present invention, it is possible to provide an electric storage device in which cooling air supplied to an air passage formed between electric storage elements is less likely to leak to the outside.
Drawings
Fig. 1 is a perspective view of a power storage device according to an embodiment of the present invention.
Fig. 2 is a perspective view of a power storage element of a power storage device according to the same embodiment.
Fig. 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 a power storage device according to the same embodiment.
Fig. 5 is a perspective view of an internal separator, an external separator, and an electric storage element of an electric storage device according to the same embodiment.
Fig. 6 is a side view of a power storage element and a separator of a power storage device according to the same embodiment.
Fig. 7 is an enlarged view of a 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 a 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 a power storage device according to the same embodiment, and is an enlarged view of a region IX in fig. 6.
Fig. 10 is an enlarged view of a power storage device according to another embodiment of the present invention.
Fig. 11 is a schematic diagram for explaining a state in which the 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 the duct is attached to the power storage device.
Fig. 13 is a side view of a conventional power storage device.
Fig. 14 is an enlarged view of a conventional power storage device, and is an enlarged view of a region in the vicinity of the facing portion of the separator.
Fig. 15 is an exploded perspective view of a conventional power storage device.
Description of the reference numerals
1 … electricity storage element, 2 … partition plate, 2a … internal partition plate, 2B … external partition plate, 3 … holding member, 4 … insulator, 5 … sealing member, 6 … duct, 10 … housing, 11 … external terminal, 20 … base, 20a … base, 20B … base, 21a … limiter, 21B … limiter, 22B … mosaic, 23B … shaft, 30 … end fitting, 31 … frame, 31a … first frame, 31B … second frame, 40 … first insulating portion, 41 … second insulating portion, 42 … third insulating portion, 100 … housing main body, 100a … closure body, 100B …, 100c … first wall, 100d … second wall, 101 … cover plate, 200a … first abutting portion, 200B … protruding portion (internal contact portion), 100a … B … second abutting portion, 2a … B … coupling portion 202a …, … B … through 36201 through air passage, 210a … first regulation piece, 210B … first regulation piece, 211a … second regulation piece, 211B … second regulation piece, 212a … extension portion, 212B … extension portion, 213a … inclined surface (inclined surface of extension portion), 213B … inclined surface (inclined surface of extension portion), 214a … extension surface, 214B … extension surface, 215a … abutment surface, 215B … abutment 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 …, 312a … first support portion, 312B … second support portion, 313 … fixing portion, 313a … first fixing portion, 313B … second fixing portion, 313c … first hole portion, 313d … second hole portion, α … angle
Detailed Description
Hereinafter, an embodiment of a power storage device according to the present invention will be described with reference to the drawings. Note that the names of the respective members in the present embodiment are the names in the present embodiment, and may be different from the names of the respective members in the background art.
As shown in fig. 1, the power storage device includes: the electric storage device 1, the separators 2 adjacent to the electric storage device 1, and the holding member 3 holding the electric storage device 1 and the separators 2 as a whole. The holding member 3 is formed of a conductive material. The power storage device further includes an insulator 4, and the insulator 4 is disposed between the power storage element 1 and the holding member 3.
As shown in fig. 2 and 3, the power storage element 1 includes: an electrode assembly including a positive electrode and a negative electrode, a case 10 housing the electrode assembly, and a pair of external terminals 11 disposed on an outer surface of the case 10.
The housing 10 includes a housing main body 100 and a cover 101, the housing main body 100 having an opening, the cover 101 closing the opening of the housing main body 100, and a pair of external terminals 11 arranged on an outer surface of the cover 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 a peripheral edge of the closing portion 100a so as to surround the closing portion 100 a.
The main body 100b includes a pair of first walls 100c and a pair of second walls 100d, the pair of first walls 100c facing each other with a gap therebetween, and the pair of second walls 100d facing each other with the pair of first walls 100c therebetween.
The first wall 100c and the second wall 100d are each formed in a rectangular shape. That is, the surfaces of the first wall 100c and the second wall 100d are flat surfaces, and constitute a quadrangular region. The first wall 100c and the second wall 100d are disposed adjacent to each other with their edges abutting each other. The end edge of the first wall 100c and the end edge of the second wall 100d adjacent to each other are connected to each other over the entire length. Thereby, the main body 100b is formed in a rectangular tube shape. One end of the body portion 100b is closed by the closing portion 100 a. On the other hand, the other end of the main body 100b is open. In the housing 10, the opening is closed by a cover plate 101.
In the present embodiment, the surface area of the first wall 100c is larger than the surface area of the second wall 100 d. The main body 100b is formed in a flat rectangular tube 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. In the present embodiment, the plurality of power storage elements 1 are arranged such that the first walls 100c of the case 10 face the same direction. 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 the following description, for convenience, the arrangement direction (first direction) of the power storage elements 1 is referred to as the X-axis direction. One of two axial directions (second direction) orthogonal to the arrangement direction (X-axis direction) of the power storage elements 1 and to each other is referred to as a Z-axis direction, and the remaining one is referred to as a Y-axis direction. In each drawing, orthogonal three axes (coordinate axes) corresponding to the X-axis direction, the Y-axis direction, and the Z-axis direction are shown as an aid.
The separator 2 has insulation properties. The separator 2 has a base portion adjacent to the case 10 (the first wall 100c of the main body portion 100 b) of the electric storage element 1, and a regulating portion that prevents positional deviation of the electric storage element 1 adjacent to the base portion.
The separator 2 will be described more specifically. As described above, the power storage device includes the plurality of power storage elements 1. As shown in fig. 4, the power storage device includes two types of separators 2(2A, 2B). That is, the power storage device includes, as the separator 2: a separator (hereinafter referred to as an internal separator) 2A disposed between the two power storage elements 1, and a separator (hereinafter referred to as an external separator) 2B adjacent to the power storage element 1 located at the end closest to the end among the plurality of power storage elements 1.
First, the inner separator 2A will be explained. As shown in fig. 5, the internal partition 2A has a base portion 20A and a regulating portion 21A, the base portion 20A is adjacent to the electric storage element 1 (the first wall 100c of the case main body 100), and the regulating portion 21A prevents positional deviation of two electric storage elements 1 adjacent to the base portion 20A.
The base portion 20A of the internal separator 2A is sandwiched between the two power storage elements 1. Therefore, the base portion 20A of the separator 2A has a first surface facing one of the two adjacent power storage elements 1 and a second surface opposite to the first surface facing the other power storage element 1 of the two adjacent power storage elements 1.
The base portion 20A of the internal separator 2A has a first end disposed at a position corresponding to the lid plate 101 of the electricity storage element 1 and a second end opposite to the first end disposed at a position corresponding to the sealing portion 100A of the electricity storage element 1. Further, base portion 20A of internal separator 2A has a third end disposed at a position corresponding to one second wall 100d of power storage element 1, and a fourth end on the opposite side of the third end disposed at a position corresponding to the other second wall 100d of 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 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 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. The third end and the fourth end of the base portion 20A of the inner 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. Further, base portion 20A of internal separator 2A is formed to have a size substantially equal to that of first wall 100c of power storage element 1.
In the power storage device of the present embodiment, a ventilation passage through which a fluid (cooling fluid) passes is formed between the first surface of the base portion 20A of the internal separator 2A and the power storage element 1, or between the second surface of the base portion 20A of the internal separator 2A and the power storage element 1.
More specifically, the description will be given. The base portion 20A of the internal partition 2A is formed in a rectangular wave shape. In the power storage element 1 of the present embodiment, the base portion 20A of the internal separator 2A includes the first contact portion 200A and the second contact portion 201A, the first contact portion 200A contacts only one power storage element 1 of the two adjacent power storage elements 1, and the second contact portion 201A contacts only the other power storage element 1 of the two adjacent power storage elements 1. Also, the base portion 20A of the internal bulkhead 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 abutment 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 bulkhead 2A has a plurality of first abutment portions 200A and a plurality of second abutment portions 201A. The first contact portions 200A and the second contact portions 201A are alternately arranged in a direction in which the first ends and the second ends of the base portion 20A of the internal separator 2A are aligned.
Thus, as shown in fig. 6, in the electrical storage device, the ventilation passage 203A is formed by a surface of the first contact portion 200A opposite to the surface of the first contact portion 200A that contacts the electrical storage element 1, and a pair of coupling portions 202A that are connected to the first contact portion 200A. In addition, in the power storage device, the ventilation passage 203A is formed by a surface of the second abutment portion 201A opposite to the surface abutting against the power storage element 1, and a pair of coupling portions 202A connected to the second abutment portion 201A. Therefore, in the power storage device, air passages 203A through which cooling air can flow are 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.
As described above, the internal separator 2A is disposed between two adjacent power storage elements 1. Therefore, the internal separator 2A includes two regulating portions 21A that are to regulate the relative movement of the two power storage elements 1 adjacent to the internal separator 2A, the two regulating portions 21A being a regulating portion 21A extending toward the power storage element 1 adjacent to the first surface of the base portion 20A of the internal separator 2A and a regulating portion 21A extending toward the power storage element 1 adjacent to the second surface of the base portion 20A of the internal separator 2A.
More specifically, the description will be given. As shown in fig. 5, the regulating portions 21A are formed at respective corner portions of the base portion 20A of the internal separator 2A.
Each of the restricting portions 21A has: the first regulating piece 210A is connected to an outer edge of the base 20A extending in the Z-axis direction, and the second regulating piece 211A is connected to an outer edge of the base 20A extending in the Y-axis direction, the first regulating piece 210A extends from the base 20 in the X-axis direction, and the second regulating piece 211A extends from the base 20A in the X-axis direction.
The first regulating piece 210A of the regulating portion 21A formed at the first corner is connected to the third end of the base portion 20A. The second regulating piece 211A of the regulating portion 21A formed at the first corner portion is connected to the first end of the base portion 20A.
The first regulating piece 210A of the regulating portion 21A formed at the second corner is connected to the fourth end of the base portion 20A. The second regulating piece 211A of the regulating portion 21A formed at the second corner is connected to the first end of the base portion 20A.
The first regulating piece 210A of the regulating portion 21A formed in the third corner portion is connected to the third end of the base portion 20A. The second regulating piece 211A of the regulating portion 21A formed in the third corner portion is connected to the second end of the base portion 20A.
The first regulating piece 210A of the regulating portion 21A formed at the fourth corner is connected to the fourth end of the base portion 20A. The second regulating piece 211A of the regulating portion 21A formed at the fourth corner portion is connected to the second end of the base portion 20A.
As described above, the internal separator 2A includes: a regulating portion 21A extending toward the electricity storage element 1 adjacent to the first surface of the base portion 20A thereof, and a regulating portion 21A extending toward the electricity storage element 1 adjacent to the second surface of the base portion 20A of the internal separator 2A. Therefore, in each internal separator 2A, the first restriction pieces 210A of the pair of restriction portions 21A constitute opposing portions which face each other on two adjacent (japanese translation: ) separators 2 in the X axis direction.
Opposing portion 210A is disposed at a position facing air passage 203A and adjacent to power storage element 1 in the direction of flow of cooling air in air passage 203A. The facing portions 210A are arranged in a line in the X-axis direction.
As shown in fig. 7, in the internal separator 2A, the facing portion 210A is in contact with the facing portion 210A of the adjacent internal separator 2A via the energy storage element 1 on one side in the X-axis direction.
More specifically, the description will be given. One opposing portion 210A has an extending portion 212A, and the extending portion 212A 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 on 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 extending portion 212A is in contact with the inclined surface 216A of the facing portion 210A adjacent to one side in the X-axis direction. The extending portion 212A has a surface that contacts at least a portion of the inclined surface 216A of the facing portion 210A adjacent to one side in the X-axis direction.
The extending portion 212A of the present embodiment has an inclined surface 213A, and the inclined surface 213A faces the inclined surface 216A of the facing portion 210A adjacent to one side in the X-axis direction in the Z-axis direction. The extending portion 212A has an extending surface 214A extending straight in the X-axis direction from the inclined surface 213A.
The inclined surface 213A is a surface inclined with respect to both the X-axis direction and the Z-axis direction. The extension surface 214A is a surface extending in the X-axis direction and the Y-axis direction.
Therefore, in the extending portion 212A of the facing portion 210A, a surface that is in contact with at least a part of the inclined surface 216A of the facing portion 210A adjacent in the X-axis direction is bent at a halfway position in the X-axis direction. In the present embodiment, a surface including the inclined surface 213A and the extended surface 214A may be referred to as an abutment surface 215A in the following description.
Further, in the facing portion 210A of the present embodiment, the pair of extending portions 212A are disposed with a space therebetween in the Z-axis direction. In the Z-axis direction, the pair of extending portions 212A are arranged such that the contact surfaces 215A thereof face in opposite directions. In addition, the pair of extensions 212A are elastic.
The inclined surface 216A of the opposing portion 210A is inclined with respect to the X-axis direction and the Z-axis direction (the direction orthogonal to the direction in which the pair of opposing portions 210A face each other and the direction in which the cooling air flows). That is, the inclined surface 216A of the facing portion 210A is formed to be inclined with respect to a plane extending in the X-axis direction and the Y-axis direction, and to extend straight in the Y-axis direction.
The inclined surface 216A of the present embodiment is formed by a part of a recess 217A formed in the other first regulating piece 210A, and the recess 217A opens toward the facing portion 210A adjacent to each other in the X-axis direction. Therefore, the facing portion 210A has a pair of inclined surfaces 216A facing each other with a space therebetween in the Z-axis direction.
The pair of inclined surfaces 216A are arranged at positions aligned with the extending portions 212A of the pair of extending portions 212A in the X-axis direction.
The pair of inclined surfaces 216A are formed such that the distance between each pair of inclined surfaces becomes narrower as the distance from the facing portions 210A adjacent to each other in the X axis direction becomes smaller.
In the facing portion 210A, the portions of the inclined surfaces 216A on the opening side of the recess 217A are arranged so that the distance between the portions is larger than the distance between the distal ends of the pair of extending portions 212A (the distance between the abutting surfaces 215A).
Further, in the facing portion 210A, the portions of the pair of inclined surfaces 216A on the bottom surface side of the recess portion 217A are arranged so that the distance between the inclined surfaces 216A is smaller than the distance between the ends on the tip end sides of the pair of extending portions 212A (the distance between the abutment surfaces 215A).
Next, the outer separator 2B will be explained. As shown in fig. 5, the outer partition 2B has: a base portion (hereinafter referred to as base portion) 20B having a first surface facing the power storage element 1 (first wall 100c of the case body 100) and a second surface opposite to the first surface, and a regulating portion (hereinafter referred to as regulating portion) 21B for determining a position of the power storage element 1 adjacent to the base portion 20B.
The base portion 20B of the external bulkhead 2B of the present embodiment faces an end fitting 30, described later, of the holding member 3. That is, the external separator 2B is disposed between the storage element 1 and the terminal member 30 (see fig. 4).
The external partition 2B has a fitting portion 22B to be fitted to the end fitting 30 at a position where the base portion 20B faces the end fitting 30. That is, the external spacer 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. The external 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 is expanded in the Y-axis direction and the Z-axis direction. That is, the base 20B is formed in a plate shape. The base portion 20B of the external spacer 2B has a first end disposed at a position corresponding to the cap plate 101 of the electricity storage element 1 and a second end opposite to the first end disposed at a position corresponding to the sealing portion 100a of the electricity storage element 1. Further, base portion 20B of external separator 2B has a third end disposed at a position corresponding to one second wall 100d of power storage element 1, and a fourth end on the opposite side of the third end disposed at a position corresponding to the other second wall 100d of power storage element 1.
The base portion 20B of the external partition 2B has: the first corner portion is a portion to which the first end and the third end are connected, and the second corner portion is a portion to which the first end and the fourth end are connected. Further, the base portion 20B of the external partition 2B has: 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 connected, respectively.
Further, the first end and the second end of the base portion 20B of the outer partition 2B extend in the Y-axis direction. The third end and the fourth end of the base portion 20B of the outer diaphragm 2B extend in the direction orthogonal to the Z-axis direction. Therefore, the base portion 20B of the external partition 2B is substantially rectangular. The size of base 20B of external spacer 2B is substantially equal to first wall 100c of power storage element 1.
An air passage for passing a fluid between the first surface of the base portion 20B and the power storage element 1 is formed in the first surface of the base portion 20B of the outer separator 2B.
More specifically, the description will be given. The external 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) abuts against the power storage element 1. The internal contact portion 200B extends from the first surface of the base portion 20B toward the case 10 of the power storage element 1 (the first wall 100c of the case main body 100).
The long side of the inner contact portion 200B is in the Y-axis direction. As shown in fig. 6, the base portion 20B of the external spacer 2B of the present embodiment has a plurality of internal contact portions 200B. The plurality of internal contact portions 200B are arranged at intervals in a direction orthogonal to the longitudinal direction. Also, the base portion 20B of the outer partition 2B has coupling portions 201B, and the coupling portions 201B are connected to the adjacent protruding portions 200B in the Z-axis direction, respectively. Thus, 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 power storage element 1. Therefore, the external separator 2B includes a regulating portion 21B for regulating the relative movement of the power storage element 1 adjacent to the first surface, and the regulating portion 21B extends toward the power storage element 1 adjacent to the first surface of the base portion 20B of the external separator 2B.
More specifically, the description will be given. As shown in fig. 5, the regulating portions 21B are formed at respective corner portions of the base portion 20B of the external separator 2B.
Each of the restricting portions 21B has: the first regulating piece 210B is connected to an outer edge of the base 20B extending in the Z-axis direction, and the second regulating piece 211B is connected to an outer edge of the base 20B extending in the Y-axis direction, the first regulating piece 210B extends from the base 20 in the X-axis direction, and the second regulating piece 211B extends from the base 20B in the X-axis direction.
The first regulating piece 210B of the regulating portion 21B formed at the first corner is connected to the third end of the base portion 20B. The second regulating piece 211B of the regulating portion 21B formed at the first corner portion is connected to the first end of the base portion 20B.
The first regulating piece 210B of the regulating portion 21B formed at the second corner portion is connected to the fourth end of the base portion 20B. The second regulating piece 211B of the regulating portion 21B formed at the second corner portion is connected to the first end of the base portion 20B.
The first regulating piece 210B of the regulating portion 21B formed in the third corner portion is connected to the third end of the base portion 20B. The second regulating piece 211B of the regulating portion 21B formed in the third corner portion is connected to the second end of the base portion 20B.
The first regulating piece 210B of the regulating portion 21B formed at the fourth corner is connected to the fourth end of the base portion 20B. The second regulating piece 211B of the regulating portion 21B formed at the fourth corner portion is connected to the second end of the base portion 20B.
As described above, the external separator 2B includes the regulating portion 21B extending toward the power storage element 1 adjacent to the first surface of the base portion 20B. Therefore, in the outer separator 2B, the first regulating pieces 210B of the regulating portion 21B constitute facing portions 210A facing the inner separators 2A adjacent in the X-axis direction, respectively.
Facing portion 210B of outer separator 2B is disposed at a position facing air passage 202B and adjacent to power storage element 1 in the direction of flow of cooling air in air passage 202B. The facing portions 210B of the outer separators 2B are arranged in a row with the facing portions 210A of the inner separators 2A in the X-axis direction.
As shown in fig. 6, in the outer separator 2B, the facing portion 210B of the outer separator 2B is in contact with the facing portion 210A of the inner separator 2A adjacent in the X-axis direction via the energy storage element 1.
As described above, the outer separator 2B of the present embodiment is disposed adjacent to the inner separator 2A via the power storage element 1. That is, the power storage device includes a pair of external separators 2B.
Therefore, as shown in fig. 8, the facing portion 210B of the one outer separator 2B has an extending portion 212B extending from the first regulating piece 210B toward the one side in the X-axis direction.
The extending portion 212B is in contact with the inclined surface 216A of the facing portion 210A of the internal partition plate 2A adjacent in the X-axis direction. Therefore, the extending portion 212B has a surface that contacts at least a part of the inclined surface 216A of the facing portion 210A of the internal separator 2A adjacent in the X-axis direction.
The extending portion 212B of the present embodiment has an inclined surface 213B, and the inclined surface 213B faces the inclined surface 216A of the facing portion 210A of the internal separator 2A adjacent to the inclined surface in the X-axis direction in the Z-axis direction. The extending portion 212B has an extending surface 214B extending straight in the X-axis direction from the inclined surface 213B.
The inclined surface 213B is a surface inclined with respect to both the X-axis direction and the Z-axis direction. The extension surface 214B is a surface extending in the X-axis direction and the Y-axis direction.
Therefore, in the extending portion 212B of the facing portion 210B, a surface that is in contact with at least a part of the inclined surface 216A of the facing portion 210A of the internal separator 2A adjacent in the X-axis direction is bent at a halfway position in the X-axis direction. In the present embodiment, a surface including the inclined surface 213B and the extended surface 214B may be the contact surface 215B as described below.
Further, in the present embodiment, in the facing portion 210B of the outer partition 2B, the pair of extending portions 212B are disposed with a space in the Z-axis direction. In the Z-axis direction, the pair of extending portions 212B are arranged such that the contact surfaces 215B thereof face in opposite directions. In addition, the pair of extending portions 212B have elasticity, respectively.
As shown in fig. 9, the facing portion 210B of the other outer separator 2B has an inclined surface 216B that contacts the extending portion 212A of the facing portion 210A of the inner separator 2A adjacent to the other side in the X-axis direction, and the inclined surface 216B is inclined with respect to the X-axis direction and the Z-axis direction (a direction orthogonal to both the facing direction of the facing portion 210B of the outer separator 2B with respect to the facing portion 210A of the inner separator 2A and the flowing direction of the cooling air).
As described above, the inclined surface 216B of the facing portion 210B of the other external separator 2B is inclined with respect to both the X-axis direction and the Z-axis direction. That is, the inclined surface 216B of the facing portion 210B of the external separator 2B is formed to be inclined with respect to a plane extending in the X-axis direction and the Y-axis direction, and to extend straight in the Y-axis direction.
The inclined surface 216B of the present embodiment is formed by a part of the recess 217B formed in the first regulating piece 210B, and the recess 217B opens toward the facing portion 210A of the internal separator 2A adjacent to each other in the X-axis direction. Therefore, the facing portion 210B of the external separator 2B has a pair of inclined surfaces 216B facing each other with a space therebetween in the Z-axis direction.
The pair of inclined surfaces 216B are arranged at positions aligned with the extending portions 212A of the pair of extending portions 212A of the internal partition plate 2A in the X-axis direction.
The pair of inclined surfaces 216B are formed so that the distance between the inclined surfaces becomes narrower as the inclined surfaces are separated from the facing portions 210A of the internal separators 2A adjacent to each other in the X-axis direction.
In the facing portion 210B of the outer separator 2B, the portions of the inclined surfaces 216B on the opening side of the concave portion 217B are arranged so as to have a larger interval than the interval between the distal ends of the pair of extending portions 212A of the inner separator 2A (the interval between the abutting surfaces 215A).
Further, in the facing portion 210B of the outer separator 2B, the portions of the pair of inclined surfaces 216B on the bottom surface side of the recess 217B are formed so that the distance between them is smaller than the distance between the ends on the tip end sides of the pair of extended portions 212A of the inner separator 2A (the distance between the abutment surfaces 215A).
In the present embodiment, the holding member 3 is made of metal. As shown in fig. 4, the holding member 3 includes: a pair of end fittings 30 disposed adjacent to the respective external partition plates 2B, and a frame 31 connecting the pair of end fittings 30.
The pair of end fittings 30 each have: a first surface facing the external separator 2B, and a second surface opposite to the first surface. The pair of end fittings 30 each have a pressure contact portion 300 that contacts the base portion 20B of the external partition 2B.
The terminal member 30 has: the first end is disposed at a position corresponding to the cover plate 101 of the electricity storage element 1, and the second end (the second end disposed at a position corresponding to the sealing portion 100a of the electricity storage element 1) is opposite to the first end. In addition, the terminal member 30 has: and is disposed at a third end corresponding to one second wall 100d of the power storage element 1 and at a fourth end opposite to the third end (disposed at a fourth end corresponding to the other second wall 100d of the power storage element 1).
The terminal member 30 includes: the first corner portion is a portion to which the first end and the third end are connected, and the second corner portion is a portion to which the first end and the fourth end are connected. The terminal member 30 further has: 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 connected, respectively.
The pressure-bonding section 300 has an insertion hole 300a formed at a position corresponding to the shaft section 23B of the outer separator 2B. The pressure-bonding section 300 further has a plurality of (four in the present embodiment) through holes 300b formed in each corner portion.
The frame 31 has a first connecting portion 310 extending across the pair of end members 30 and disposed at a position corresponding to the cap plate 101 of the electric storage element 1, and a second connecting portion 311 extending across the pair of end members 30 and disposed at a position corresponding to the sealing portion 100a of the electric 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.
In the frame 31 of the present embodiment, the support portion 312 is connected to the first connection portion 310 and the second connection portion 311, and is formed in a frame shape. In the power storage device of the present embodiment, a member having the first connection portion 310, the second connection portion 311, and the support portion 312 arranged on one side of the power storage element in a direction orthogonal to the X-axis direction (hereinafter referred to as the Y-axis direction) may be described below as the first frame 31A, and a member having the first connection portion 310, the second connection portion 311, and the support portion 312 arranged on the other side of the power storage element in the Y-axis direction may be described below as the second frame 31B.
The frame 31 has a fixing portion 313 connected to the end fitting 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 boundary is disposed at a position corresponding to the cap plate 101 of the power storage element 1. In first connection portion 310, the other portion having the bent portion as the boundary is disposed at a position corresponding to second wall 100d of power storage element 1.
The second connection portion 311 has a first end and a second end opposite to 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, one portion having the bent portion as a boundary is disposed at a position corresponding to the lid plate 101 of the power storage element 1, and the other portion having the bent portion as a boundary is disposed at a position corresponding to the second wall 100d of the power storage element 1.
The support portion 312 has a first support portion 312a and a second support portion 312b, the first support portion 312a being connected to a first end of the first connection portion 310 and a first end of the second connection portion 311, the second support portion 312b being connected to a second end of the first connection portion 310 and a second end of the second connection portion 311.
The fixing portion 313 includes: a pair of first fixing portions 313a formed at first and second ends of the first connection portion 310, and a pair of second fixing portions 313b formed at first and second ends of the second connection portion 311.
The first fixing portion 313a faces a portion around the through hole 300b of the terminal member 30. The other first fixing portion 313a faces a portion around the through hole 300b of the other end fitting 30. The pair of first fixing portions 313a are formed with first hole portions 313c at positions corresponding to the through holes 300b, respectively.
Therefore, the first connecting portion 310 is connected to the end fitting 30 by screwing a bolt that inserts the through hole 300b of the end fitting 30 and the first hole portion 313c of the first fixing portion 313 a.
The second fixing portion 313b faces a portion around the through hole 300b of the terminal 30. The other second fixing portion 313b faces a portion around the through hole 300b of the other end fitting 30. The pair of second fixing portions 313b have second holes 313d formed at positions corresponding to the through holes 300b, respectively.
Therefore, the second connecting portion 311 is connected to the end fitting 30 by screwing a bolt that inserts the through hole 300b of the end fitting 30 and the second hole portion 313d of the second fixing portion 313 b.
The insulator 4 is made of an insulating material. Further, the insulator 4 has: a pair of first insulating portions 40 disposed between the respective connecting portions 310 of the pair of first connecting portions 310 and the separators 2 (inner separators 2A and outer separators 2B), and a pair of second insulating portions 41 disposed between the respective connecting portions 311 of the pair of second connecting portions 311 and the separators 2 (inner separators 2A and outer separators 2B).
The long side of the first insulating portion 40 is in the X-axis direction. The first insulating portion 40 is disposed 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. In addition, a portion of the first insulating portion 40 that is bordered by the bent portion abuts a portion of the first connecting portion 310 that is bordered by the bent portion. In addition, the other portion of the first insulating portion 40, which is bordered by the bent portion, abuts against the other portion of the first connecting portion 310, which is bordered by the bent portion.
The long side of the second insulating portion 41 is in the X-axis direction. Second insulating portion 41 is disposed between power storage element 1 and second connection portion 311 of frame 3. That is, the second insulating portion 41 is bent in a direction orthogonal to the longitudinal direction. In addition, a portion of the second insulating portion 41 having the bent portion as a boundary is in contact with a portion of the second connecting portion 311 having the bent portion as a boundary. In addition, the other portion of the second insulating portion 41 having the bent portion as a boundary is in contact with the other portion of the first connecting portion 311 having the bent portion as a boundary.
The insulator 4 of the present embodiment has two third insulating portions 42. More specifically, the description will be given. 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 are connected by the third insulating portion 42.
As described above, according to the power storage device of the present embodiment, the extension portion 212A of the facing portion 210A of the internal separator 2A extends to the facing portion 210A of the internal separator 2A adjacent in the X-axis direction or the facing portion 210B of the external separator 2B adjacent in the X-axis direction. Therefore, the extension portion 212A of the inner separator 2A is in contact with the facing portion 210A of the inner separator 2A adjacent in the X-axis direction or the facing portion 210B of the outer separator 2B adjacent in the X-axis direction.
In addition, the extending portion 212B of the facing portion 210B in the outer partition 2B extends to the facing portion 210A of the inner partition 2A adjacent in the X-axis direction. Therefore, the extending portion 212B of the facing portion 210B of the outer partition 2B is in contact with the facing portion 210A of the inner partition 2A adjacent in the X-axis direction.
Thus, the cooling air to flow between the facing portions 210A of the inner separators 2A adjacent in the X-axis direction and between the facing portions 210A of the inner separators 2A and the facing portions 210B of the outer separators 2B adjacent in the X-axis direction is blocked by the extending portions 212A of the facing portions 210A of the inner separators 2A and the extending portions 212B of the facing portions 210B of the outer separators 2B.
Therefore, in the power storage device, the flow of air from the end edge on the air passage 203A, 202B side of the facing portion 210A of each separator 2 to the end edge on the opposite side to the air passage 203A, 202B side of the facing portion 210A of each separator 2 is blocked. Thus, in the power storage device, the cooling air supplied to the air passages 203A and 202B formed between the power storage elements 1 is less likely to leak to the outside.
In the power storage device according to the present embodiment, the portion where the extended portion 212A of the internal separator 2A contacts the inclined surface 216A of the internal separator 2A and the portion where the extended portion 212A of the internal separator 2A contacts the inclined surface 216B of the external separator 2B are inclined with respect to the Z-axis direction.
Therefore, in the power storage device, the flow of air from the end edge on the air passage 203A, 202B side of the facing portion 210A of each separator 2 to the end edge on the opposite side to the air passage 203A, 202B side of the facing portion 210A of each separator 2 can be effectively blocked.
The extension 212A of the facing portion 210A of the inner partition 2 and the extension 212B of the facing portion 210B of the outer partition 2B have elasticity. Therefore, in the power storage device, even if the interval between the facing portions 210A of the inner separators 2A or the interval between the facing portions 210A of the inner separators 2A and the facing portions 210B of the outer separators 2B becomes narrower due to a manufacturing error or the like, the variation in the interval can be absorbed by the elastic deformation of the extending portions 212A of the facing portions 210A of the inner separators 2A or the elastic deformation of the extending portions 212B of the facing portions 210B of the outer separators 2B.
In this way, in the power storage device, even if the interval between the facing portions 210A of the internal separators 2A or the interval between the facing portion 210A of the internal separator 2A and the facing portion 210B of the external separator 2B becomes narrow due to a manufacturing error or the like, it is possible to maintain the state in which the extending portion 212A of the internal separator 2A is in contact with the facing portion 210A of the internal separator 2A or the facing portion 210B of the external separator 2B, and the state in which the extending portion 212B of the external separator 2B is in contact with the facing portion 210A of the internal separator 2A.
Further, in the facing portion 210A of each internal partition 2A, the pair of inclined surfaces 216A are formed so that the distance therebetween becomes narrower gradually toward the bottom surface side of the recess 217A. Therefore, the narrower the interval between the facing portion 210A of the internal separator 2A and the facing portion 210A of the other internal separator 2A adjacent to the other in the X-axis direction or the interval between the facing portion 210B of the external separator 2B, the narrower the interval between the pair of extending portions 212A of the internal separator 2A or the pair of extending portions 212B of the external separator 2B, the more the interval between the tips of the extending portions becomes.
In the facing portion 210B of the other external separator 2B, the pair of inclined surfaces 216B are formed so that the distance therebetween becomes narrower gradually toward the bottom surface side of the recess 217B. Therefore, the narrower the interval between the facing portion 210B of the other outer separator 2B and the facing portion 210A of the other inner separator 2A adjacent to the other in the X-axis direction, the more the pair of extending portions 212A of the inner separator 2A elastically deform so that the interval between the tips becomes narrower.
Therefore, in the power storage device, as the distance between the facing portion 210A of the inner separator 2A and the facing portion 210B of the outer separator 2B becomes narrower, the urging force of the extending portion 212A of the inner separator 2A and the extending portion 212B of the outer separator 2B, which restore the distance, becomes stronger. Therefore, the power storage device is in a state where the separators 2 adjacent to each other in the X-axis direction are coupled by the elastic body, and the resistance to vibration is improved.
The facing portion 210A of the internal partition 2A includes a plurality of (two in the present embodiment) extending 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 air passage 203A side toward the end edge of the opposing portion 203A on the opposite side is blocked by the two extending portions 212A of the internal partition plate 2A. This can more effectively suppress leakage of the cooling air to the outside of the power storage device through between the pair of opposing portions 210A.
The facing portion 210B of the external partition board 2B includes a plurality of (two in the present embodiment) extending portions 212B.
Therefore, in the power storage device, the flow of air from the end edge on the air passage 202B side of the facing portion 210B toward the end edge on the opposite side of the air passage 202B between the facing portion 210B of the outer separator 2B and the facing portion 210A of the inner separator 2A is blocked by the plurality of extending portions 212B of the outer separator 2B. This can more effectively suppress leakage of the cooling air to the outside of the power storage device through the space between the facing portion 210B of the outer separator 2B and the facing portion 210A of the inner separator 2A.
Further, adjacent pairs of the opposing portions 210A in each internal partition 2A define 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 along with the expansion or contraction of the power storage element 1.
The holding member 3 that integrally holds the electric storage element 1 and the internal separator 2A includes a frame 31, and the frame 31 extends in the X-axis direction in which the pair of opposing portions 210A face each other, and is disposed on one side of the electric storage element 1 in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis. The pair of opposing portions 210A is sandwiched between the electric storage element 1 and the frame 31 in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis. Further, in the direction orthogonal to the X axis (Y axis direction or Z axis direction), extending portion 212A and inclined surface 216A of opposing portion 210A are sandwiched between power storage element 1 and frame 31.
Thereby, the pair of opposing portions 210A, the extending portions 212A, and the inclined surfaces 216A are protected from physical contact from the outside. As a result, the contact state of the extension portion 212A and the inclined surface 216A can be suppressed from being released by physical contact.
The power storage device includes an insulator 4 disposed between the power storage element 1 and the frame 31, and a pair of opposing portions 210A is sandwiched between the power storage element 1 and the insulator 4 in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis direction. Further, in the direction orthogonal to the X axis (Y axis direction or Z axis direction), extending portion 212A and inclined surface 216A of opposing portion 210A are sandwiched between energy storage element 1 and insulator 4.
Thus, even if a stress is applied from the outside, the pair of opposing portions 210A, the extending portions 212A, and the inclined surfaces 216A can be buffered by the insulator. As a result, the contact state of the extending portion 212A and the inclined surface 216A can be suppressed from being released.
The power storage device of the above embodiment includes:
at least one power storage element 1 formed in a rectangular tube shape, and having a pair of first walls 100c and a pair of second walls 100d, the pair of first walls 100c facing each other in the X-axis direction, and the pair of second walls 100d facing each other with the pair of first walls 100c interposed therebetween;
a first separator (inner separator 2A or outer separator 2B) which is adjacent to the power storage element 1 in the X-axis direction and forms an air passage through which cooling air can flow between the power storage element 1 and the first separator (inner separator 2A or outer separator 2B) in the Y-axis direction orthogonal to the X-axis direction;
a second separator (inner separator 2A or outer separator 2B) adjacent to the first separator with the power storage element 1 interposed therebetween;
the first separator has a first opposed portion 210A opposed to the second separator in the X-axis direction, the second separator has a second opposed portion (opposed portion 210A of the inner separator 2A or opposed portion 210B of the outer separator 2B) opposed to the first opposed portion of the first separator (opposed portion 210A of the inner separator 2A or opposed portion 210B of the outer separator 2B) in the X-axis direction,
the first opposing portion has an extension portion (either the extension portion 212A of the inner partition plate 2A or the extension portion 212B of the outer partition plate 2B) extending toward the second opposing portion,
the extension part is connected with the second opposite part.
Thus, in the power storage device, the cooling air that is going to flow between the facing portions 210A of the inner separators 2A adjacent in the X-axis direction and between the facing portions 210A of the inner separators 2A and the facing portions 210B of the outer separators 2B adjacent in the X-axis direction is blocked by the extending portions 212A of the facing portions 210A in the inner separators 2A or the extending portions 212B of the facing portions 210B of the outer separators 2B.
Fig. 11 and 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, cooling air flows between the adjacent power storage elements 1 through a path indicated by an arrow in fig. 11. Here, in the case where the extension portion and the second opposing portion are not in contact with each other, the cooling air can flow between the pair of opposing portions through a path shown by an arrow in fig. 12. Specifically, in the above embodiment, since the seal member 5 is disposed between the frame 31 and the duct 6, almost no cooling air passes between the frame 31 and the duct 6. On the other hand, in the case where the extending portion and the second opposing portion are not in contact, as shown by the arrows in fig. 12, cooling wind may flow between the pair of opposing portions sandwiched between the power storage element 1 and the frame 31. Therefore, a state can be obtained in which a part of the fluid sucked by the exhaust fan does not pass between the power storage elements 1. In the above embodiment, the extension portion is in contact with the second opposing portion, and thereby the cooling air that can flow between the pair of opposing portions can be blocked.
In addition, the second opposing portion may have a recess, and the extension portion may be in contact with an inner surface of the recess. The power storage device of the present embodiment includes a recess 217A formed in each of the inner separators 2A and a recess 217B formed in the other outer separator 2B. As shown in fig. 7, the recess 217A of the internal partition 2A is defined by the pair of inclined surfaces 216A and the bottom portion connecting the pair of inclined surfaces 216A. As shown in fig. 9, the concave portion 217B of the external separator 2B is defined by the pair of inclined surfaces 216B and the bottom portion connecting the pair of inclined surfaces 216B.
Thus, the portion where the extended portion contacts is housed in the recess, and thus the contact state between the extended portion and the inner surface of the recess can be suppressed from being released by physical contact from the outside.
In this case, the extending portion may be in contact with the inner surface of the recess in the Z-axis direction.
Thus, even when the pair of opposing portions are displaced in the X-axis direction by expansion or contraction of the power storage element 1, the contact state between the extension portions and the inner surface of the recess can be suppressed from changing.
The first opposing portion may have a plurality of extending portions, and the plurality of extending portions may be in contact with the inner surface of the recess.
This makes it possible to effectively shield the cooling air that can flow between the pair of opposing portions.
The plurality of extending portions 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 inner separator 2A has a pair of extending portions 212A, and one outer separator 2B has a pair of extending portions 212B. The pair of extending portions 212A are disposed at intervals in the Z-axis direction, and define a gap in the X-axis direction. Further, of the pair of extending portions 212A, the extending portion 212A disposed on the upper side in the Z axis direction is in contact with the inner surface of the recess on the upper side of the extending portion 212A, and of the pair of extending portions 212A, the extending portion 212A disposed on the lower side in the Z axis direction is in contact with the inner surface of the recess on the lower side of the extending portion 212A. The pair of extending portions 212A define a gap extending in the X-axis direction, and when the pair of extending portions 212A contact the inner surface of the recess in the Z-axis direction, the defined gap can be displaced. As a result, the stress generated in the pair of extending portions 212A can be relaxed by the gap. The same effect can be obtained even with the pair of extension portions 212B of the outer partition 2B.
Further, the tip end of the extension portion may define a gap with the inner surface of the recess portion in the X-axis direction.
Thereby, the relative positions of the extending portion and the recessed portion in the X-axis direction can be changed along with the expansion or contraction of the power 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 along with the expansion or contraction of the power storage element 1.
The holding member that holds the power storage element, the first separator, and the second separator as a whole has a frame that extends in the X-axis direction and is disposed on one side of the power storage element in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis direction,
the first and second opposing portions may be sandwiched between the electric storage element and the frame in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis direction.
Thereby, the first and second opposing portions are protected from physical contact from the outside. As a result, the contact state of the extension portion and the second opposing portion can be suppressed from being released by physical contact.
The power storage device of the present embodiment may further include an insulator disposed between the power storage element and the frame, and the first and second opposing portions may be sandwiched between the power storage element and the insulator in a direction (Y-axis direction or Z-axis direction) orthogonal to the X-axis direction.
Thus, even if stress is applied from the outside, the first and second opposing portions can be buffered by the insulator. As a result, the contact state of the extension portion and the second opposing portion can be suppressed from being released.
The power storage device of the present invention is not limited to the above-described embodiment, and it is apparent that various modifications can be made without departing from the scope of the present invention.
In the above embodiment, the base portion 20A of the internal separator 2A has a substantially rectangular shape, and the size thereof is substantially equal to the first wall 100c of the power 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 be adapted to the posture of each of the two adjacent power storage elements 1, and is not limited to a size substantially equal to the first wall 100c of the power storage element 1.
In the above embodiment, the base portion 20A of the internal separator 2A has a rectangular wave shape, and thus the ventilation passage 203A is formed between the base portion 20A and the power storage element 1. However, the shape of the base portion 20A of the internal separator 2A is not limited to the rectangular wave shape as long as the fluid can pass between the first surface and the power storage element 1 (between the second surface and the power storage element 1). When air passage 203A may not be formed between base portion 20A of internal separator 2A and power storage device 1, base portion 20A of internal separator 2A may be formed in a flat plate shape.
In the above embodiment, each of the regulating portions 21A of the internal partition 2A is formed as each corner portion of the base portion 20A. However, the restriction 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 power storage element 1 with respect to the base portion 20A can be determined.
In the above embodiment, the base portion 20B of the external separator 2B has a substantially rectangular shape, and the size thereof is substantially equal to the first wall 100c of the power storage element 1. However, the base portion 20B is not limited to a substantially rectangular shape, and is not limited to a size substantially equal to the first wall 100c of the power storage element 1, as long as the base portion 20B can correspond to the posture of the adjacent power storage element 1 and the posture of the terminal member 30.
In the above embodiment, the regulating portion 21B is formed at each corner 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 it can determine the position where the power storage element 1 is arranged with respect to the base portion 20B.
In the above embodiment, the facing portion 210A of the internal partition 2A includes the pair of extending portions 212A, but is not limited thereto. For example, the facing portion 210A of the internal partition 2A may include one extending portion 212A or three or more extending portions 212A. The facing portion 210A of the internal partition 2A may further include a plurality of pairs of extending portions 212A.
The facing portion 210B of the outer partition 2B includes a pair of extending portions 212B, but is not limited thereto. For example, the facing portion 210B of the outer partition 2B may include one extending portion 212B or three or more extending portions 212B. The facing portion 210B of the external partition 2B may further include a plurality of pairs of extending portions 212B.
In the above embodiment, the inclined surface 216A of the internal partition 2A is inclined with respect to both the X-axis direction and the Z-axis direction, but is not limited thereto. The inclined surface 216A of the internal separator 2A is not particularly limited as long as it can be in contact with the extended portion 212A of the internal separator 2A or the extended portion 212B of the external separator 2B.
In the above embodiment, the inclined surface 216B of the external separator 2B is inclined with respect to both the X-axis direction and the Z-axis direction, but the present invention is not limited thereto. The inclined surface 216B of the outer separator 2B is not particularly limited as long as it can contact the extended portion 212A of the inner separator 2A.
In the above embodiment, the extension portion 212A of the internal partition plate 2A is configured to abut against the inclined surface 216A of the internal partition plate 2A, but is not limited thereto. For example, the extending portion 212A of the internal partition plate 2A may be configured such that the distal end thereof contacts the facing portion 210A (the bottom surface of the recess 217A) of the internal partition plate 2A in the X-axis direction.
Even in this case, since the extending portion 212A of the internal separator 2A abuts against the facing portion 210A, the cooling air is less likely to leak from between the facing portions 210A of the internal separators 2A adjacent in the X axis direction.
The extension portion 212B of the outer separator 2B is also configured to abut against the inclined surface 216A of the inner separator 2A, but is not limited thereto. For example, the extending portion 212B of the outer separator 2B may be configured such that the distal end thereof contacts the facing portion 210A (the bottom surface of the recess 217A) of the inner separator 2A in the X-axis direction.
Even in this case, since the extension portion 212B of the outer partition 2B abuts against the facing portion 210A of the inner partition 2A, the cooling air is less likely to leak from between the facing portion 210B of the outer partition 2B and the facing portion 210A of the inner partition 2A.
In the above embodiment, the inclined surface 216A of the internal partition 2A is inclined with respect to the X-axis direction and the Z-axis direction, respectively, but is not limited thereto. For example, the inclined surface 216A of the inner separator 2A may be formed of a flat surface whose portion contacting the extended portion 212A of the inner separator 2A or the extended portion 212B of the outer separator 2B is extended in the X-axis direction and the Y-axis direction.
That is, the inclined surface 216A of the inner separator 2A may be orthogonal to the Z-axis direction as long as it can contact the extended portion 212A of the inner separator 2A or the extended portion 212B of the outer separator 2B.
Further, in the above embodiment, the inclined surface 216B of the external separator 2B is inclined with respect to the X-axis direction and the Z-axis direction, respectively, but is not limited thereto. For example, the inclined surface 216B of the outer separator 2B may be a flat surface extending in the X-axis direction and the Y-axis direction at a portion in contact with the extension portion 212A of the inner separator 2A.
That is, the inclined surface 216A of the internal partition plate 2A may be in contact with the extended portion 212A of the internal partition plate 2A, and may not be inclined with respect to the X-axis direction and the Z-axis direction.
In the above embodiment, the extension 212A of the internal partition 2A has elasticity, but is not limited thereto. For example, the extension 212A of the inner partition 2A may not have elasticity.
In the above embodiment, the contact surface 215A of the extending portion 212A of the internal separator 2A is bent at a halfway position in the X-axis direction, but the present invention is not limited thereto. For example, the extension portion 212A of the internal partition plate 2A may be inclined with respect to the X-axis direction and the Z-axis direction, respectively, across the entire structure. That is, the contact surface 215A of the extended portion 212A of the internal partition 2A may be formed only by the inclined surface 216A.
In the above embodiment, the contact surface 215B is bent at a halfway position in the X-axis direction in the extending portion 212B of the outer separator 2B, but the present invention is not limited thereto. For example, the extension portion 212B of the outer partition 2B may be inclined with respect to the X-axis direction and the Z-axis direction, respectively, across the entire structure. That is, the abutment surface 215B of the extended portion 212B of the external separator 2B may be formed only by the inclined surface 216B.
Although not particularly mentioned in the above embodiment, the facing portion 210A of the internal partition 2A may be configured to contact the inclined surface 213A of the extending portion 212A. The facing portion 210A of the inner separator 2A is preferably configured such that the inclined surface 213A of the extending portion 212A and the inclined surface 216A of the inner separator 2A adjacent in the X-axis direction (or the inclined surface 216B of the outer separator 2B adjacent in the X-axis direction) are in contact with each other.
The facing portion 210B of the external separator 2B may be configured to contact the inclined surface 213B of the extending portion 212B. The facing portion 210B of the outer separator 2B is preferably configured such that the inclined surface 213B of the extending portion 212B and the inclined surface 216A of the inner separator 2A adjacent to each other in the X-axis direction are in contact with each other.
In this way, the extending portion 212B of the outer separator 2B is in contact with the inclined surface 216A, so that the contact portion between the inclined surface 213B of the extending portion 212B and the facing portion 210A of the inner separator 2A extends in the direction intersecting the Z-axis direction. This can more effectively block the flow of air between the facing portions 212B and 210A from the end of the facing portion 210A on the air passage 203A side toward the end on the opposite side from the air passage 203A.
When the inclined surface 213A of the extending portion 212A and the inclined surface 216A of the inner separator 2A adjacent to each other in the X-axis direction (or the inclined surface 216B of the outer separator 2B adjacent to each other in the X-axis direction) are brought into contact with each other, and the inclined surface 216B of the extending portion 212B and the inclined surface 216A of the inner separator 2A adjacent to each other in the X-axis direction in the facing portion 210B of the outer separator 2B are brought into contact with each other, the extending portion (first inclined surface) and the other facing portion 210A (second inclined surface) are brought into contact so that contact portions of the inclined surfaces 213A and 216B and the inclined surface 216A extend in a direction intersecting the second direction. This can more effectively block the flow of air between the facing portions 210A from the end edge of the facing portion 210A on the side of the air passage 203A toward the end edge on the opposite side of the air passage 203A.
In this case, as shown in fig. 10, the angle α formed by the inclined surface 213A of the extending portion 212A of the internal separator 2A and the inclined surface 216A of the internal separator 2A adjacent in the X-axis direction (or the inclined surface 216B of the external separator 2B adjacent in the X-axis direction) is preferably set to 0 ° < α.
The angle α formed by the inclined surface 213B of the extending portion 212B of the outer separator 2B and the inclined surface 216A of the inner separator 2A adjacent to each other in the X-axis direction is preferably set to 0 ° < α.
When the inclined surfaces 212A and 213B are parallel to the inclined surface 216A, a gap may be formed between the inclined surfaces 212A and 213B and the inclined surface 216A due to a manufacturing error in manufacturing the separator. However, with the above configuration, if the angle α is greater than 0 °, that is, if the first inclined surfaces 212A and 213B are not parallel to the inclined surface 216A, it is possible to prevent the occurrence of a gap due to the manufacturing error.
Further, the angle α formed by the inclined surface 213A of the extended portion 212A of the inner separator 2A and the inclined surface 216A of the inner separator 2A adjacent in the X-axis direction (or the inclined surface 216B of the outer separator 2B adjacent in the X-axis direction) is more preferably set to 0 ° < α ≦ 15 °.
Further, the angle α formed by the inclined surface 213B of the extension 212B of the outer separator 2B and the inclined surface 216A of the inner separator 2A adjacent to each other in the X-axis direction is preferably set to 0 ° < α ≦ 15 °.
In the above embodiment, although not particularly mentioned, it is preferable that the extension portion 212A of the inner separator 2A is in contact from one end of the inclined surface 216A of the inner separator 2A or the inclined surface 216B of the outer separator 2B in the Y-axis direction to the other end opposite to the one end.
Further, the extending portion 212B of the outer separator 2B preferably extends from one end of the inclined surface 216A of the inner separator 2A in the Y axis direction across the other end opposite to the one end and contacts the other end.
In the above embodiment, the extension 212A of the internal partition plate 2A is in contact with a part of the inclined surface 216A of the internal partition plate 2A or a part of the inclined surface 216B of the external partition plate 2B, but is not limited thereto. For example, the extension 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, the air flow between the facing portions 210A from the end edge of the facing portion 210A on the air passage 203A side toward the end edge on the opposite side from the air passage 203A can be blocked in the entire region between the facing portions 210A in the flow direction of the cooling air. This can more effectively suppress leakage of the cooling air to the outside of the power storage device through between the pair of opposing portions 210A.
In the above embodiment, the exhaust fan that generates the flow of the fluid by reducing the pressure in the duct 6 is attached, but the intake fan that generates the flow of the fluid by increasing the pressure in the duct 6 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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