WO2023190713A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2023190713A1
WO2023190713A1 PCT/JP2023/012866 JP2023012866W WO2023190713A1 WO 2023190713 A1 WO2023190713 A1 WO 2023190713A1 JP 2023012866 W JP2023012866 W JP 2023012866W WO 2023190713 A1 WO2023190713 A1 WO 2023190713A1
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WO
WIPO (PCT)
Prior art keywords
power storage
storage element
wall
axis direction
wall portion
Prior art date
Application number
PCT/JP2023/012866
Other languages
French (fr)
Japanese (ja)
Inventor
強志 飛鷹
智弘 川内
卓 森口
翔 米澤
宏樹 東
喜弘 増田
恵太 浜川
Original Assignee
株式会社Ｇｓユアサ
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Filing date
Publication date
Application filed by 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Publication of WO2023190713A1 publication Critical patent/WO2023190713A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
    • H01G11/18—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against thermal overloads, e.g. heating, cooling or ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • H01M10/6554—Rods or plates
    • 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
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • 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

Definitions

  • the present invention relates to a power storage device.
  • Patent Document 1 discloses a secondary battery device (power storage device) in which a plurality of secondary battery cells (power storage elements) are housed in a holding member (case body) having a bottom wall.
  • the heat may be transmitted to a normal power storage element through the bottom wall of the holding member and have an adverse effect.
  • An object of the present invention is to suppress the thermal influence from one power storage element to other power storage elements.
  • a power storage device includes a power storage element and a holding member that holds the power storage element, and the holding member has a bottom wall that supports the power storage element, and a bottom wall that supports the power storage element in a first direction.
  • a first wall portion disposed adjacent to the bottom wall and protruding from the bottom wall; and a second wall portion disposed at a position different from the first wall portion and protruding from the bottom wall, the second wall portion protruding from the bottom wall.
  • the one wall portion extends in a second direction intersecting the first direction, and the slope of the opposing surface of the first wall portion that faces the electricity storage element is greater than the slope of the second wall portion.
  • thermal influence from one power storage element to other power storage elements can be suppressed.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled.
  • FIG. 3 is a perspective view showing the configuration of the power storage element according to the embodiment.
  • FIG. 4 is a perspective view and a sectional view showing the structure of the holding member according to the embodiment.
  • FIG. 5 is a sectional view of the first wall portion of the holding member according to the embodiment.
  • FIG. 6 is a top view showing a configuration in which a power storage element and a spacer are arranged in a holding member according to an embodiment.
  • FIG. 7 is a sectional view showing the second wall portion according to the embodiment.
  • FIG. 8 is an explanatory diagram showing the state transition between the power storage element and the wall according to the embodiment.
  • FIG. 9 is a sectional view showing a first wall portion according to a modification.
  • FIG. 10 is a perspective view showing the configuration of the bus bar according to the embodiment.
  • a power storage device includes a power storage element and a holding member that holds the power storage element, and the holding member is connected to a bottom wall that supports the power storage element in a first direction.
  • a first wall portion disposed adjacent to the power storage element and protruding from the bottom wall; and a second wall portion disposed at a position different from the first wall portion and protruding from the bottom wall.
  • the first wall extends in a second direction intersecting the first direction, and the slope of the opposing surface of the first wall facing the electricity storage element is greater than the slope of the second wall.
  • a power storage element expands when the temperature becomes excessively high.
  • the wall portion (second wall portion) of the holding member (exterior body) that holds the power storage element usually has a draft angle. Since the slope of the opposing surface of the first wall portion disposed adjacent to the power storage element is larger than the slope of the second wall portion, the first wall portion has a slope larger than a normal draft angle.
  • the power storage element moves upward along the opposing surface and separates from the bottom wall of the holding member. This makes it difficult for the heat of the power storage element to be transferred to the bottom wall, so it is possible to suppress the heat from propagating to other power storage elements via the bottom wall of the holding member. Therefore, it is possible to suppress the thermal influence of one power storage element among the plurality of power storage elements arranged on the other power storage elements.
  • the opposing surfaces include a first surface provided at a position close to the bottom wall, and a first surface provided at a position farther from the bottom wall than the first surface. a second surface, and the slope of the second surface may be greater than the slope of the first surface.
  • the side surface of the power storage element expands in an arc shape. Therefore, in a region inside the peripheral edge of the power storage element, the amount of displacement during expansion in the normal direction of the side surface of the power storage element is large.
  • the second surface is located farther from the bottom wall than the first surface. Therefore, if the first surface is placed at a position corresponding to the periphery of the energy storage element, the second surface will correspond to the area where the amount of displacement is larger than the periphery of the energy storage element, and will absorb the expansion of the energy storage element. Cheap. Since the slope of the second surface is greater than the slope of the first surface, the expanded electricity storage element can smoothly move away from the bottom wall.
  • a power storage device includes a power storage element and a holding member that holds the power storage element, and the holding member is connected to a bottom wall that supports the power storage element in a first direction.
  • a first wall portion disposed adjacent to the power storage element and protruding from the bottom wall; the first wall portion includes an opposing surface facing the power storage element; , extending in a second direction intersecting the first direction, and the opposing surfaces include a first surface provided at a position close to the bottom wall, and a first surface provided at a position farther from the bottom wall than the first surface. and a second surface having a slope, the slope of the second surface being greater than the slope of the first surface.
  • the side surface of the power storage element expands in an arc shape. Therefore, in a region inside the peripheral edge of the power storage element, the amount of displacement during expansion in the normal direction of the side surface of the power storage element is large.
  • the second surface is located farther from the bottom wall than the first surface. Therefore, if the first surface is placed at a position corresponding to the periphery of the energy storage element, the second surface will correspond to the area where the amount of displacement is larger than the periphery of the energy storage element, and will absorb the expansion of the energy storage element. Cheap. Since the slope of the second surface is greater than the slope of the first surface, the expanded electricity storage element can smoothly move away from the bottom wall.
  • the length in the third direction intersecting the first direction and the second direction is The length may be within 1/8 of the length of the electricity storage element in the third direction.
  • the side surface of the power storage element expands in an arc shape.
  • the slope of the peripheral edge portion of the side surface of the power storage element is larger than the slope of the center portion.
  • the expanded electricity storage element is placed at a position corresponding to the peripheral edge with a large inclination. A first wall can be placed. Therefore, the peripheral edge portion of the power storage element having a large slope can be brought into contact with the opposing surface of the first wall portion. Thereby, the expanded electricity storage element can be smoothly moved in a direction away from the bottom wall.
  • the smoother the power storage element can be moved the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, the propagation of heat to other power storage elements via the bottom wall of the holding member can be further suppressed, and the influence of heat on other power storage elements can be further suppressed.
  • the first wall portion may be arranged to face a central portion of the power storage element in the second direction.
  • the opposing surface is arranged at a location where the expansion of the power storage element is large in the second direction as well.
  • the expanded electricity storage element can be smoothly moved in a direction away from the bottom wall by the opposing surface.
  • the smoother the power storage element can be moved the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, the propagation of heat to other power storage elements via the bottom wall of the holding member can be further suppressed, and the influence of heat on other power storage elements can be further suppressed.
  • a bent portion may be provided at an intermediate portion in a direction in which the adjacent power storage devices are lined up.
  • the bus bar includes a bent portion
  • the bent portion can follow stress.
  • the bus bar connected to the power storage element is subjected to stress. Since the bent portion of the bus bar can follow the stress, the expanded electricity storage element can be smoothly moved from the holding member.
  • the power storage device is arranged at a position where the power storage element is sandwiched between the power storage element and the holding member in a direction in which the power storage element and the holding member are lined up. It may also include a metal lid.
  • the electricity storage element is sandwiched between the holding member and the lid.
  • the power storage element expands and moves away from the holding member, the power storage element approaches the lid. Since the lid body is made of metal, it can effectively radiate heat from the electricity storage element. Therefore, when a power storage element expands, thermal effects on other power storage elements can be further suppressed.
  • the first wall portion may include a heat transfer member having higher thermal conductivity than the holding member.
  • the first wall includes the heat transfer member
  • the heat of the electricity storage element is transferred to the heat transfer member and is radiated. Ru. This can suppress heat from propagating from the expanded power storage element to other power storage elements, and can further suppress thermal effects on other power storage elements.
  • the directions shown in the following description and drawings will be explained.
  • the direction in which a pair of electrode terminals (positive electrode and negative electrode) in one power storage element are arranged, the opposing direction of the short sides of the container of the power storage element, or the short direction of the holding member is defined as the X-axis direction.
  • the direction in which the plurality of power storage elements are lined up, the direction in which the long sides of the container of the power storage elements face each other, the direction in which the power storage elements and spacers are lined up, or the longitudinal direction of the holding member is defined as the Y-axis direction.
  • the arrangement direction of the bottom wall of the holding member and the power storage element, the protruding direction of the electrode terminal of the power storage element, the arrangement direction of the main body and the lid (the holding member and the lid member) of the exterior body, the main body and the lid body (the first The direction in which the first support and the second support are lined up or the vertical direction is defined as the Z-axis direction.
  • These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment).
  • the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
  • the X-axis plus direction indicates the arrow direction of the X-axis
  • the X-axis minus direction indicates the opposite direction to the X-axis plus direction.
  • the X-axis direction it refers to both or one of the X-axis plus direction and the X-axis minus direction.
  • the Y-axis direction and the Z-axis direction will also be referred to as the first direction
  • the X-axis direction will also be referred to as the second direction
  • the Z-axis direction will also be referred to as the third direction.
  • the slope is the acute angle that the surface of the member constituting the power storage device makes with the Z-axis direction (third direction).
  • FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment.
  • FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the embodiment is disassembled.
  • the power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment.
  • the power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like.
  • the power storage device 1 is used for driving or starting an engine of a moving object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. Used as batteries, etc.
  • Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles.
  • Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor.
  • the power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
  • the power storage device 1 includes a power storage unit 10 and a board unit 20 attached to the power storage unit 10.
  • the power storage unit 10 has a substantially rectangular parallelepiped shape that is elongated in the Y-axis direction.
  • the board unit 20 is a device that can monitor the state of the power storage element 100 included in the power storage unit 10 and control the power storage element 100, and has a circuit board and the like inside.
  • the substrate unit 20 is a flat rectangular member that is attached to the end of the power storage unit 10 in the longitudinal direction, that is, to the side surface of the power storage unit 10 in the negative direction of the Y-axis.
  • the power storage unit 10 includes a plurality of power storage elements 100, a plurality of spacers 200, an exterior body 300, a plurality of bus bars 400, an exterior body support 500, cables 410 and 420, have.
  • the power storage element 100 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the power storage element 100 has a flat rectangular parallelepiped shape (prismatic shape), and in this embodiment, 14 power storage elements 100 are arranged in a line in the Y-axis direction.
  • the size and shape of power storage element 100, the number of power storage elements 100 arranged, etc. are not limited, and only one power storage element 100 may be arranged.
  • the power storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor.
  • the power storage element 100 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it.
  • Power storage element 100 may be a battery using a solid electrolyte.
  • the power storage element 100 may be a pouch type power storage element. A detailed description of the configuration of power storage element 100 will be described later.
  • the spacer 200 (210, 220) is a flat rectangular member that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction) and heats and/or insulates the power storage element 100 and other members. It is.
  • the spacer 200 is a heat insulating plate or an insulating plate that is arranged in the positive Y-axis direction or the negative Y-axis direction of the power storage element 100 and heats and/or insulates the power storage elements 100 from each other or the power storage element 100 and the exterior body support 500. be.
  • the spacer 200 is formed of a member having heat insulating properties such as glass wool or mica, or a member having insulating properties such as any resin material that can be used for the exterior body 300 described below. Spacer 210 and spacer 220 of spacer 200 may be made of the same material, or may be made of different materials.
  • the spacer 200 is made of glass wool that has heat insulating properties.
  • the thermal conductivity of the spacer 200 is lower than that of the holding member 310. Since the spacer 200 is arranged between adjacent power storage elements 100, when one power storage element becomes high in temperature, it is possible to suppress the heat of the high temperature power storage element from being transmitted to the adjacent power storage element.
  • the spacer 210 of the spacers 200 is a flat rectangular spacer parallel to the XZ plane that is arranged between two adjacent power storage elements 100 and insulates and/or insulates between the two power storage elements 100. (intermediate spacer). Specifically, spacer 210 is disposed between long sides 111 of containers 110, which will be described later, of the two power storage elements 100, facing the long sides 111. In this embodiment, 13 spacers 210 and 14 power storage elements 100 are arranged alternately in the Y-axis direction, but when the number of power storage elements 100 is other than 14, the spacers 210 The number is also changed as appropriate depending on the number of power storage elements 100.
  • the spacer 210 is not limited to being arranged between all of the power storage elements 100, and a configuration may be adopted in which the spacer 210 is not arranged between any of the power storage elements 100. All the spacers 210 may be made of the same material, or any of the spacers 210 may be made of different materials.
  • the spacer 220 of the spacers 200 is disposed between the power storage element 100 at the end and the side wall of the exterior body support 500, and provides insulation between the power storage element 100 at the end and the side wall of the exterior body support 500. and/or an insulating flat rectangular spacer (end spacer) parallel to the XZ plane.
  • Two spacers 220 are arranged between the power storage elements 100 located at both ends in the Y-axis direction and the side walls of the exterior body support 500 at both ends in the Y-axis direction.
  • the spacer 220 is arranged between the long side surface 111 of the container 110 of the power storage element 100 at the end in the Y-axis direction and the side wall of the exterior body support 500 facing in the Y-axis direction. It is arranged opposite to the side wall of the body support 500.
  • the two spacers 220 may be made of the same material, or may be made of different materials.
  • the exterior body 300 is a member that is arranged outside of the plurality of power storage elements 100 and the plurality of spacers 200 and forms a casing (outer shell of the power storage unit 10) that covers the plurality of power storage elements 100 and the like. Specifically, the exterior body 300 is arranged on both sides of the plurality of power storage elements 100 in the Z-axis direction so as to sandwich the plurality of power storage elements 100 and the plurality of spacers 200 in the Z-axis direction. Covers both ends in the Z-axis direction. Thereby, the exterior body 300 fixes the plurality of power storage elements 100 and the plurality of spacers 200 at predetermined positions.
  • the exterior body 300 is made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET). , polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA), ABS It is formed of an insulating member such as resin or a composite material thereof, or metal coated with an insulating coating. Exterior body 300 thereby prevents power storage element 100 and the like from coming into contact with external metal members and the like. Exterior body 300 may be formed of a conductive member such as metal, as long as the insulation of power storage element 100 and the like is maintained.
  • the exterior body 300 includes a holding member 310 that constitutes a lower member of the exterior body 300 and a lid member 320 that constitutes an upper member of the exterior body 300.
  • the holding member 310 and the lid member 320 may be made of the same material, or may be made of different materials.
  • the holding member 310 is a tray that is elongated in the Y-axis direction. Specifically, the holding member 310 is arranged in the negative Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 200, and is elongated in the Y-axis direction to hold the plurality of power storage elements 100 and the plurality of spacers 200. It is a shallow box-shaped (flat, substantially rectangular parallelepiped) tray with a shallow depth. A detailed description of the configuration of the holding member 310 will be given later.
  • the lid member 320 is arranged in the Z-axis positive direction of the plurality of power storage elements 100 and the plurality of spacers 200, and has a box shape (flat substantially rectangular parallelepiped shape) that is elongated in the Y-axis direction and supported by the plurality of power storage elements 100. It is a member of Since the lid member 320 is disposed between the second support body 520 of the exterior body support body 500 and the power storage element 100, which will be described later, it can also be said that the lid member 320 is the inner lid of the power storage unit 10.
  • the lid member 320 is a busbar frame (also referred to as a busbar holder or a busbar plate), and serves to insulate the busbar 400 from other members, regulate the position of the busbar 400, and the like.
  • the lid member 320 is disposed on the plurality of power storage elements 100 and positioned with respect to the plurality of power storage elements 100, and the plurality of bus bars 400 are positioned with respect to the lid member 320.
  • each bus bar 400 is positioned with respect to the plurality of power storage elements 100 and joined to the electrode terminal 140 that the plurality of power storage elements 100 have.
  • the bus bar 400 is a rectangular plate-like member that is arranged on the plurality of power storage elements 100 and electrically connects the electrode terminals 140 of the plurality of power storage elements 100.
  • bus bar 400 and electrode terminal 140 are connected (joined) with bolts, but they may be connected (joined) by welding or the like.
  • the bus bar 400 is formed of a metal conductive member such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal.
  • bus bar 400 connects 14 power storage elements 100 in series by connecting electrode terminals 140 of adjacent power storage elements 100, but the connection mode of power storage elements 100 is limited to the above. However, any combination of series and parallel connections may be used.
  • the bus bar 400 has a pair of connecting portions 401 that are connected to the electrode terminals 140, an intermediate portion 402, and a bent portion 403.
  • the intermediate portion 402 and the bent portion 403 are the same portion.
  • electrode terminals 140 of adjacent power storage elements 100 and bus bars 400 are connected.
  • the bus bar 400 has an intermediate portion 402 located in the middle of the range where the pair of connecting portions 401 are located side by side.
  • a bent portion 403 is further formed.
  • the bent portion 403 is formed by bending the bus bar 400, which is a metal plate-like member, into a U-shape in the Z-axis direction at the intermediate portion 402.
  • the bending portion 403 can follow the stress acting on the bus bar 400.
  • Intermediate portion 402 is also an intermediate portion of bus bar 400 in the direction in which adjacent power storage elements 100 are lined up. The bend may be formed as a groove.
  • the power storage device 1 By connecting the electrode terminals 140 of the power storage elements 100 located at both ends in the Y-axis direction of the plurality of power storage elements 100 to the cables 410 and 420, the power storage device 1 charges with electricity from the outside, It can also discharge electricity to the outside. Cables 410 and 420 are positive and negative electric wires (power cables) through which current flows for charging and discharging power storage device 1 (power storage element 100).
  • the exterior body support 500 is a member that supports and protects (reinforces) the exterior body 300.
  • the exterior support 500 is made of a metal member such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.
  • the exterior body support 500 has a first support body 510 that constitutes the main body of the exterior body support body 500 and a second support body 520 that constitutes the lid body of the exterior body support body 500.
  • the first support body 510 and the second support body 520 may be made of the same material, or may be made of different materials.
  • the first support body 510 is a member on which the holding member 310 is disposed and supports the holding member 310 from below (Z-axis negative direction), and has a bottom wall 511 and connection parts 512 and 513.
  • the bottom wall 511 is a flat, rectangular portion that constitutes the bottom wall of the power storage unit 10 and extends in the Y-axis direction and parallel to the XY plane, and is arranged in the negative Z-axis direction of the holding member 310.
  • the connecting portion 512 is a plate-shaped portion that stands upright in the Z-axis positive direction from the Y-axis negative end of the bottom wall 511 and protrudes in the Y-axis negative direction, and is connected to the second support 520. .
  • the connecting portion 513 is a plate-shaped portion that stands upright in the Z-axis positive direction from the Y-axis positive direction end of the bottom wall 511 and protrudes in the Y-axis positive direction, and is connected to the second support body 520. .
  • the second support body 520 is a member that presses and supports the lid member 320 from above (Z-axis positive direction), and has a top surface portion 521 and connection portions 522 and 523.
  • the top surface portion 521 is a flat, rectangular portion that constitutes the top surface portion (outer lid) of the power storage unit 10 and extends in the Y-axis direction and parallel to the XY plane, and is arranged in the positive Z-axis direction of the lid member 320.
  • Ru is a portion that extends in the negative Z-axis direction from the end of the top surface portion 521 in the negative Y-axis direction and projects in the negative Y-axis direction, and is connected to the connecting portion 512 of the first support body 510 .
  • the connecting portion 523 is a portion that extends from the end of the top surface portion 521 in the Y-axis positive direction in the Z-axis negative direction and projects in the Y-axis positive direction, and is connected to the connecting portion 513 of the first support body 510.
  • the second support body 520 is an example of a lid body.
  • the first support body 510 and the second support body 520 are arranged such that the connecting portions 512 and 513 and the connecting portions 522 and 523 are secured with screws or the like, with the holding member 310 and the lid member 320 being sandwiched from the Z-axis direction. It is configured to be fixed by being connected (joined) with.
  • the exterior body support body 500 supports (holds) the exterior body 300.
  • the second support body 520 sandwiches the plurality of power storage elements 100 with the holding member 310 in the direction in which the power storage elements 100 and the holding member 310 are lined up.
  • the direction in which power storage element 100 and holding member 310 are lined up is also the third direction.
  • FIG. 3 is a perspective view showing the configuration of power storage element 100 according to the embodiment.
  • FIG. 3 shows an enlarged appearance of one power storage element 100 among the plurality of power storage elements 100 shown in FIG. 2 . Since all of the plurality of power storage elements 100 have the same configuration, the configuration of one power storage element 100 will be described in detail below.
  • the power storage element 100 has a substantially rectangular parallelepiped shape.
  • the power storage element 100 includes a container 110 and a pair of electrode terminals 140 (a positive electrode and a negative electrode). Inside the container 110, an electrode body, a pair of current collectors (a positive electrode and a negative electrode), an electrolytic solution (nonaqueous electrolyte), and the like are housed, but illustration thereof is omitted.
  • the type of electrolytic solution is not particularly limited as long as it does not impair the performance of power storage element 100, and various types can be selected.
  • the power storage element 100 includes an insulating gasket that insulates and seals between the container 110, the electrode terminal 140, and the current collector, illustration of this gasket is also omitted.
  • the power storage element 100 may include a spacer placed on the side or below the electrode body, an insulating film that wraps around the electrode body, and the like.
  • An insulating film (such as a shrink tube) may be placed around the container 110 to cover the outer surface of the container 110.
  • the material of the insulating film is not particularly limited as long as it can ensure the insulation required for the power storage element 100.
  • insulating resin such as PC, PP, PE, PPS, PET, PBT or ABS resin, epoxy resin, Kapton (registered trademark), Teflon (registered trademark), silicone, polyisoprene, and polychloride can be used. Vinyl etc. are exemplified.
  • the container 110 is a rectangular parallelepiped-shaped (prismatic or box-shaped) case that includes a container body 120 with an opening formed therein and a lid portion 130 that closes the opening of the container body 120.
  • the container body 120 is a rectangular cylindrical member having a bottom and forming the main body portion of the container 110, and has an opening formed in the positive direction of the Z-axis.
  • the lid portion 130 is a rectangular plate-like member that is long in the X-axis direction and constitutes the lid of the container 110, and is arranged in the positive Z-axis direction of the container body 120.
  • the container 110 (lid 130) includes a gas discharge valve 131 that releases the pressure when the pressure inside the container 110 increases excessively, and a liquid injection valve for injecting electrolyte into the inside of the container 110. (not shown), etc. are provided.
  • the material of the container 110 (container body 120 and lid part 130) is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate, but resin may also be used. can.
  • the container 110 has a structure in which the inside is sealed by accommodating the electrode body and the like inside the container body 120, and then joining the container body 120 and the lid portion 130 by welding or the like.
  • the container 110 has a pair of long sides 111 on both sides in the Y-axis direction, a pair of short sides 112 on both sides in the X-axis direction, and a bottom surface 113 on the negative side in the Z-axis direction.
  • the long side surface 111 is a rectangular flat portion parallel to the XZ plane that forms the long side surface of the container 110, and is disposed to face the adjacent spacer 200 in the Y-axis direction.
  • the long side 111 is adjacent to the short side 112 and the bottom 113 and has a larger area than the short side 112.
  • the short side surface 112 is a rectangular flat portion parallel to the YZ plane that forms the short side surface of the container 110.
  • the short side surface 112 is adjacent to the long side surface 111 and the bottom surface 113 and has a smaller area than the long side surface 111.
  • the bottom surface 113 is a rectangular plane part parallel to the XY plane that forms the bottom surface of the container 110, and is disposed adjacent to the long side surface 111 and the short side surface 112.
  • the long side surface 111 is also the long side surface of the power storage element 100.
  • Short side 112 is also a short side of power storage element 100.
  • the electrode terminal 140 is a terminal member (a positive electrode terminal and a negative electrode terminal) of the electricity storage element 100 arranged in the lid part 130, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. There is.
  • the electrode terminal 140 is a metal member that leads the electricity stored in the electrode body to the external space of the electricity storage element 100 and introduces electricity into the internal space of the electricity storage element 100 to store electricity in the electrode body. be.
  • the electrode terminal 140 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
  • the electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.
  • the positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy.
  • the negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy.
  • the active material used for the positive electrode active material layer and the negative electrode active material layer any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions.
  • As the separator a microporous sheet made of resin, a nonwoven fabric, or the like can be used.
  • the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction.
  • the electrode body is a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating multiple flat electrode plates.
  • the electrode body may be in any form, such as a bellows-shaped electrode body in which a body or an electrode plate is folded into a bellows shape.
  • the current collector is a conductive member (a positive electrode current collector and a negative electrode current collector) that is electrically connected to the electrode terminal 140 and the electrode body.
  • the positive electrode current collector is formed of aluminum or an aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper, copper alloy, etc., like the negative electrode base material layer of the negative electrode plate. There is.
  • FIG. 4 is a perspective view and a cross-sectional view showing the configuration of the holding member 310 according to the embodiment.
  • FIG. 4(a) is an enlarged perspective view of the holding member 310 shown in FIG. 2
  • FIG. 4(b) is an enlarged perspective view of a part of FIG. 4(a).
  • FIG. 5 is a cross-sectional view of the wall portion 314 included in the holding member 310 according to the embodiment.
  • FIG. 5 is a cross-sectional view of the wall portion 314 of the holding member 310 taken along a plane parallel to the YZ plane including the line VV shown in FIG.
  • FIG. 5 also shows the power storage element 100 and spacer 210 arranged around the wall portion 314 with broken lines.
  • FIG. 6 is a top view showing a configuration when the power storage element 100 and the spacer 210 are arranged in the holding member 310 according to the embodiment. Specifically, FIG. 6 is a diagram of the configuration of a part of the holding member 310 shown in FIG. 4 when the power storage element 100 and the spacer 210 are arranged on the holding member 310, as viewed from the Z-axis plus direction. .
  • the holding member 310 is a resin molded product having a bottom wall 311, a pair of side walls 312, a pair of side walls 313, and a plurality of wall portions 314.
  • the bottom wall 311 is a part that is arranged in the negative Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 210 and supports the plurality of power storage elements 100 and the plurality of spacers 210 from below.
  • the bottom wall 311 is formed into a flat rectangular shape that extends parallel to the XY plane and in the Y-axis direction. That is, the bottom wall 311 is arranged to face the power storage element 100 in the Z-axis direction (the third direction intersecting the first direction and the second direction).
  • the bottom wall 311 is a wall portion that forms the bottom surface of the exterior body.
  • the bottom wall 311 is arranged to face the bottom surface 113 of the container 110 of the power storage element 100 in the Z-axis direction.
  • the bottom wall 311 has a pedestal portion 311a disposed at a position facing the bottom surface 113 of each power storage element 100. The pedestal portion 311a protrudes toward the bottom surface 113 and comes into contact with the bottom surface 113.
  • the pair of side walls 312 are long flat wall portions that protrude from both ends of the bottom wall 311 in the X-axis direction in the Z-axis plus direction and extend parallel to the YZ plane and in the Y-axis direction.
  • a pair of side walls 312 are arranged to face power storage element 100 in the X-axis direction (second direction).
  • the side wall 312 in the negative X-axis direction of the pair of side walls 312 is arranged to face the short side 112 in the negative X-axis direction of the container 110 of the power storage element 100 in the X-axis direction.
  • the side wall 312 in the X-axis positive direction is arranged to face the short side 112 in the X-axis positive direction of the container 110 of the power storage element 100 in the X-axis direction.
  • the side wall 312 has a facing surface (second facing surface) 312b facing the short side surface 112 of the power storage element 100.
  • the pair of side walls 312 are arranged at positions sandwiching the power storage element 100 in the X-axis direction.
  • the pair of side walls 313 are plate-shaped and rectangular walls that protrude from both ends of the bottom wall 311 in the Y-axis direction in the Z-axis plus direction, and extend parallel to the XZ plane and in the X-axis direction. 100.
  • the side wall 313 in the Y-axis negative direction of the pair of side walls 313 is connected to the long side 111 in the Y-axis negative direction of the container 110 of the power storage element 100 located at the end in the Y-axis negative direction among the plurality of power storage elements 100. They are arranged to face each other in the axial direction.
  • the side wall 313 in the positive Y-axis direction is arranged to face the long side 111 in the positive Y-axis direction of the container 110 of the power storage element 100 located at the end in the positive Y-axis direction in the Y-axis direction. In this way, the pair of side walls 313 are arranged at positions sandwiching the plurality of power storage elements 100 in the Y-axis direction.
  • the wall portion 314 is a wall portion that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction), extends toward the side wall 312, and is integrated with the bottom wall 311.
  • Wall portion 314 is arranged between two power storage elements 100 in the Y-axis direction (first direction) (see FIG. 5).
  • the wall portion 314 is disposed between two adjacent power storage elements 100 so as to face the long side surface 111 of the container 110 of the two power storage elements 100 .
  • the wall portion 314 is a long portion that continuously extends in the X-axis direction (second direction) toward the side wall 312, and is arranged to protrude from the bottom wall 311 in the Z-axis plus direction.
  • Wall portion 314 is continuously formed in a range including the length from one end to the other end of power storage element 100 in the X-axis direction (second direction). As long as the wall portion 314 does not protrude toward the long side surface 111 of the power storage element 100, a groove may be formed or the wall portion 314 may be formed discontinuously in the X-axis direction (second direction).
  • the wall portion 314 is a protruding portion that protrudes from the bottom wall 311 in a bulging shape in the positive direction of the Z-axis. That is, a wall recess 314b, which is a recess recessed toward the Z-axis positive direction, is formed on the surface of the wall 314 in the Z-axis negative direction. A wall recess 314a, which is a recess recessed toward the Z-axis minus direction, is formed at a position facing the wall recess 314b on the surface of the wall 314 in the Z-axis plus direction.
  • the wall recesses 314a and 314b are recesses that extend in the X-axis direction from one end of the wall 314 in the X-axis direction to the other end (see FIG. 5, etc.).
  • the wall portion 314 is formed with wall recesses 314a and 314b throughout, so that the wall portion 314 does not become too thick than the bottom wall 311 and has the same thickness as the bottom wall 311. In this way, the wall portion 314 is a continuous portion of the bottom wall 311, and is integrally formed (integrated) with the bottom wall 311.
  • the wall portion 314 is a pedestal that is arranged in the negative Z-axis direction of the spacer 210 and supports the spacer 210 in the Z-axis direction (third direction) (see FIG. 5). That is, the wall portion 314 supports the spacer 210 that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction).
  • the spacer 210 is placed on the wall portion 314 with the surface of the spacer 210 in the negative Z-axis direction being in contact with the center portion in the Y-axis direction of the surface of the wall portion 314 in the positive Z-axis direction.
  • a plurality of wall portions 314 are arranged in line in the Y-axis direction corresponding to all the spacers 210, and each wall portion 314 supports each spacer 210 from the negative Z-axis direction.
  • the wall portion 314 is thicker than the spacer 210 in the Y-axis direction and shorter than the spacer 210 in the X-axis direction.
  • wall portion 314 is arranged to face at least the center portion of power storage element 100 in the X-axis direction.
  • the length of wall portion 314 in the X-axis direction is preferably 1 ⁇ 3 or more of the length of power storage element 100 in the X-axis direction.
  • the central portion of the power storage element 100 in the X-axis direction is a region that includes the center position of the power storage element 100 in the X-axis direction, and has a length that includes the center and is approximately 1/3 of the length of the power storage element 100 in the X-axis direction. is within the range of
  • the wall recess 314a is formed to have a width smaller than the spacer 210 in the Y-axis direction and a length shorter than the spacer 210 in the X-axis direction so that the end of the spacer 210 does not enter the wall recess 314a. has been done.
  • the wall portion 314 is an example of a first wall portion disposed at a position adjacent to the power storage element 100 in the Y-axis direction when the bottom wall 311 is viewed from above (viewed in the Z-axis direction).
  • the side walls 312 and 313 are examples of second wall parts arranged at different positions from the wall part 314.
  • FIG. 7 is a sectional view showing the second wall portion according to the embodiment.
  • a side wall 312 is illustrated as the second wall portion.
  • an outer surface 312a that is an outer surface and an inner surface 312b that is an inner surface are each inclined at a gradient ⁇ with respect to the Z-axis direction (third direction).
  • the inner surface 312b is a facing surface (second facing surface) facing the short side surface 112 of the power storage element 100.
  • the gradient ⁇ is an acute angle between the second opposing surface 312b and the Z-axis direction.
  • the acute angle between the outer surface 312a and the Z-axis direction is also ⁇ .
  • This slope ⁇ is the draft angle of the resin molded product from the mold, and has a value of 0.5 degrees or more and less than 2 degrees.
  • the outer and inner surfaces of the side wall 313 also have a draft angle of the slope ⁇ , similar to the side wall 312.
  • the wall portion 314, which is the first wall portion, has an outer shape that tapers in the positive direction of the Z-axis.
  • the length H1 of the wall portion 314 in the Z-axis direction (third direction) is within 1/8 of the length of the power storage element 100 in the Z-axis direction.
  • the length H1 should be within 1 ⁇ 8 of the length of the power storage element 100 in the Z-axis direction in the container 110.
  • the length H1 is the length in the Z-axis direction from the top end of the wall portion 314 to the pedestal portion 311a, but the length H1 is the length in the Z-axis direction from the top end to the bottom end of the wall portion 314. It may also be H1.
  • the wall portion 314 is provided with a facing surface 315 that faces the long side surface 111 of the power storage element 100 in the Y-axis direction.
  • the opposing surface 315 of the wall portion 314 is also referred to as a first opposing surface to distinguish it from the opposing surface 312b (second opposing surface) that is the inner surface of the side wall 312.
  • a pair of opposing surfaces 315 are formed on both sides of the wall portion 314 in the Y-axis direction. Each opposing surface 315 is inclined with respect to the Z-axis direction.
  • the pair of opposing surfaces 315 differ in that they face opposite directions in the Y-axis direction, but have the same basic configuration.
  • Each opposing surface (first opposing surface) 315 is provided below the wall portion 314 in the Z-axis direction (third direction), and includes a planar first surface 315a formed at a position close to the bottom wall 311; It has a planar second surface 315b provided at a position farther from the bottom wall 311 than the first surface 315a.
  • the opposing surface (first opposing surface) 315 is a continuous plane extending in the X-axis direction (second direction).
  • the first surface 315a and the second surface 315b are continuous planes extending in the X-axis direction (second direction).
  • the opposing surfaces 315 may be discontinuous as long as they do not have a shape that protrudes in the normal direction of the plane.
  • An example of a discontinuous shape is a groove.
  • the first surface 315a and the second surface 315b are provided continuously in the Z-axis direction.
  • the first surface 315a is inclined with a gradient ⁇ with respect to the Z-axis direction
  • the second surface 315b is inclined with a gradient ⁇ with respect to the Z-axis direction.
  • the slope is an acute angle that the surfaces (first surface 315a, second surface 315b, etc.) of the members constituting power storage device 1 make with respect to the third direction (Z-axis direction).
  • the third direction is a direction that intersects the first direction (Y-axis direction) and the second direction (X-axis direction).
  • the third direction is a direction in which bottom wall 311 and power storage element 100 are lined up.
  • the third direction is also a direction that intersects the direction in which power storage element 100 and wall portion 314 face each other (first direction) and the direction in which wall portion 314 extends (second direction).
  • the relationship between the gradients ⁇ , ⁇ , and ⁇ is ⁇ . That is, the slope of the opposing surface 315 is larger than the slope ⁇ of the side wall 312 (second wall portion) as a whole. Specifically, the slope of the first opposing surface 315 is greater than the slope of the second opposing surface 312b.
  • the slope ⁇ may be 2 degrees or more and 5 degrees or less, and the slope ⁇ may be larger than 5 degrees.
  • the slopes ⁇ and ⁇ are 30 degrees or less, preferably 20 degrees or less.
  • the gradient of the second surface 315b is larger than the gradient of the first surface 315a.
  • a protrusion 316 is formed on the holding member 310.
  • the protrusion 316 is a protrusion that is arranged between the side wall 312 and the wall portion 314 in the X-axis direction and protrudes from the bottom wall 311 in the Z-axis direction (third direction).
  • the height of the protrusion 316 in the Z-axis direction is lower than the height of the wall portion 314 in the Z-axis direction.
  • the protrusion 316 is a continuous portion of the bottom wall 311 and is formed integrally with the bottom wall 311 . In FIGS. 4, 5, and 8, illustration of the protrusion 316 is omitted.
  • the protrusion 316 is a protrusion for positioning the power storage element 100. As shown in FIG. 6, the protrusions 316 are arranged at the bottom of the container 110 of each power storage element 100 on both sides in the Y-axis direction of both ends in the X-axis direction so as to sandwich both ends in the X-axis direction in the Y-axis direction. Ru. Four protrusions 316 are arranged for one power storage element 100. Although the power storage element 100 does not contact the wall portion 314, these four protrusions 316 contact the container 110 of the power storage element 100 in the Y-axis direction, thereby restricting movement of the power storage element 100 in the Y-axis direction.
  • the long side surface 111 of the power storage element 100 and the opposing surface 315 of the wall portion 314 are not in contact with each other.
  • the distance between the long side surface 111 and the opposing surface 315 is 2 mm or less, preferably 1 mm or less. This distance is the distance between the bottom (part connected to the bottom wall 311) of the opposing surface (first surface 315a) and the long side surface 111.
  • FIG. 8 is an explanatory diagram showing state transitions between power storage element 100 and wall portion 314 according to the embodiment. Specifically, (a) of FIG. 8 shows the state of the power storage element 100 and the wall part 314 before expansion, and (b) of FIG. 8 shows the state of the power storage element 100 and the wall part 314 during expansion. , FIG. 8(c) shows a state in which the electricity storage element 100 and the wall portion 314 have expanded more than in FIG. 8(b). In either state, each long side surface 111 of the container 110 of the power storage element 100 faces the wall portion 314.
  • each long side surface 111 of the container 110 comes into contact with the first surface (opposing surface) 315a of each wall portion 314, as shown in FIG. 8(b).
  • the angle C at the boundary between the first surface 315a and the second surface 315b expands. This can serve as a starting point for upward movement of power storage element 100. As the expansion of power storage element 100 further progresses, power storage element 100 is further pushed upward due to the inclination (gradient ⁇ ) of second surface 315b of each wall portion 314.
  • the heat of the power storage element 100 that has become excessively high in temperature is difficult to be transferred to the bottom wall 311. Since the slopes ⁇ and ⁇ are larger than the slope ⁇ , it is easy to push the expanded container 110 upward, so that the container 110 can be separated from the bottom wall 311 at an early stage.
  • the slope of the opposing surface 315 of the wall 314 (first wall) (the slope ⁇ of the first surface 315a, the slope ⁇ of the second surface 315b) ⁇ ) is larger than the slope ⁇ of the side walls 312 and 313 (second wall portion). Therefore, when the excessively heated power storage element 100 expands and hits the facing surface 315, the power storage element 100 moves upward along the facing surface 315 and separates from the bottom wall 311. Since opposing surfaces 315 (first surface 315a and second surface 315b) are continuous planes extending in the X-axis direction (second direction), upward movement of power storage element 100 becomes smooth.
  • opposing surface 315 may be a discontinuous plane extending in the X-axis direction (second direction). This makes it difficult for the heat of the power storage element 100 to be transferred to the bottom wall 311, so that it is possible to suppress the heat from propagating to other power storage elements 100 via the bottom wall 311. Therefore, among the plurality of power storage elements 100 arranged in a row, the thermal influence from one power storage element 100 to other power storage elements 100 can be suppressed.
  • the long side 111 of the power storage element 100 expands in an arc shape. Therefore, in a region inside the peripheral edge of power storage element 100, the amount of displacement during expansion in the normal direction of long side surface 111 of power storage element 100 is large.
  • the second surface 315b is located farther from the bottom wall 311 than the first surface 315a. Therefore, when the first surface 315a is arranged at a position corresponding to the peripheral edge of the power storage element 100, the second surface 315b corresponds to a portion where the amount of displacement is larger than the peripheral edge of the power storage element 100, It is easy to accept the expansion of 100.
  • the expanded power storage element 100 can be smoothly moved in the direction away from the bottom wall 311.
  • the long side surface 111 of the power storage element 100 expands in an arc shape.
  • the inclination of the peripheral portion of the long side surface 111 of the power storage element 100 in the Z-axis direction (third direction) is greater than the inclination of the central portion.
  • the inclination of the long side surface 111 in the Z-axis direction (third direction) is the acute angle that the long side surface 111 makes with the Z-axis direction (third direction).
  • the wall portion 314 since the length H1 of the wall portion 314 is within 1/8 of the length of the power storage element 100 in the Z-axis direction, the wall portion 314 is located at a position corresponding to the peripheral edge with a large inclination in the expanded power storage element 100. A wall 314 can be placed. Therefore, the peripheral edge portion of the power storage element 100 having a large slope can be brought into contact with the facing surface 315 of the wall portion 314 . Thereby, the expanded power storage element 100 can be smoothly moved in the direction away from the bottom wall 311. The smoother the power storage element 100 can be moved, the sooner the heat of the power storage element 100 will be less likely to be transferred to the bottom wall 311. Therefore, the propagation of heat to other power storage elements 100 via bottom wall 311 can be further suppressed, and the influence of heat on other power storage elements 100 can be further suppressed.
  • the opposing surface 315 is arranged at a location where the expansion of the power storage element 100 is large in the X-axis direction as well. Ru.
  • the expanded power storage element 100 can be smoothly moved in a direction away from the bottom wall 311 by the opposing surface 315.
  • the smoother the power storage element 100 can be moved the sooner the heat of the power storage element 100 will be less likely to be transferred to the bottom wall 311. Therefore, the propagation of heat to other power storage elements 100 via bottom wall 311 can be further suppressed, and the influence of heat on other power storage elements 100 can be further suppressed.
  • the expanded power storage element 100 can come into contact with the facing surface 315 of the wall portion 314 over a wide range. Therefore, the expanded power storage element 100 can be moved smoothly.
  • bus bar 400 When a plurality of power storage elements 100 are connected by bus bar 400 and used, since bus bar 400 includes a bent portion, the bent portion can follow stress.
  • the bus bar connected to the power storage element 100 receives stress that tends to shift from its normal position. Since the bent portion of the bus bar can flexibly follow the stress, the expanded electricity storage element can be smoothly moved from the holding member.
  • the plurality of power storage elements 100 are sandwiched between the holding member 310 and the second support body 520 (lid body).
  • the power storage element 100 expands and moves away from the holding member 310, the power storage element 100 approaches the second support 520 (lid). Since the second support body 520 (lid body) is made of metal, it can effectively radiate the heat of the electricity storage element 100. Therefore, when a power storage element expands, thermal effects on other power storage elements can be further suppressed.
  • the wall recesses 314a and 314b are formed in the wall 314, but at least one of the wall recesses 314a and 314b may not be formed.
  • a configuration will be described in which a wall portion does not have a wall recessed portion and the wall portion includes a heat transfer member.
  • FIG. 9 is a cross-sectional view showing a wall portion 314C according to a modification.
  • a heat transfer member 350 is disposed inside the wall portion 314C.
  • the heat transfer member 350 is made of a metal material having higher thermal conductivity than the holding member 310, such as copper, aluminum, or nickel.
  • the heat transfer member 350 integrally includes a heat transfer wall 351 and a heat transfer bottom 352.
  • the heat transfer wall 351 is a long flat wall extending parallel to the XZ plane and in the X-axis direction, and is disposed as a whole within the wall 314C. Thereby, the heat transfer wall 351 is arranged at a position corresponding to the opposing surface 315 of the wall portion 314C.
  • the heat transfer bottom 352 is a flat wall portion parallel to the XY plane, and is provided to support the bottom wall 311 of the holding member 310 from below.
  • the heat transfer wall 351 of the heat transfer member 350 is disposed on the wall portion 314C at a position corresponding to the opposing surface 315, when the expanded electricity storage element 100 comes into contact with the opposing surface 315 of the wall portion 314C, The heat of the electricity storage element 100 is transmitted to the heat transfer wall 351 and is radiated from the heat transfer bottom 352. Thereby, heat can be suppressed from propagating from expanded and overheated electricity storage element 100 to other electricity storage elements 100, and thermal effects on other electricity storage elements 100 can be further suppressed.
  • the opposing surface 315 of the wall portion 314 has the first surface 315a and the second surface 315b with mutually different slopes is illustrated, but the opposing surface is a flat plane as a whole.
  • the slope of the opposing surface may be greater than the slope of the inner surface 312b of the second wall portion.
  • the slope of the opposing surface may be at least 2 degrees, preferably at least 5 degrees.
  • the slope of the second surface 315b may be made larger than the slope of the first surface 315a without using the inner surface 312b of the second wall portion 312 as a comparison target. A similar effect can be obtained.
  • the slope of the second surface 315b may be at least 2 degrees, preferably at least 5 degrees.
  • the slopes of the first and second surfaces are 30 degrees or less, preferably 20 degrees or less.
  • the protrusion 316 of the holding member 310 restricts the movement of the power storage element 100 in the Y-axis direction, but the holding member 310 does not need to have the protrusion 316. Even if the electricity storage element 100 before expansion and the wall portion 314 are not in contact with each other, in the expanded state of the electricity storage element 100, the pair of long sides 111 of the electricity storage element 100 are connected to two opposing walls on both sides in the Y-axis direction. Each opposing surface 315 of 314 is contacted in the same manner.
  • the holding member 310 may not have the protrusion 316, and the power storage element 100 may be in contact with the bottom of the opposing surface 315 of the wall portion 314 (the portion connected to the bottom wall 311).
  • Wall portion 314 also functions as a positioning member for power storage element 100 in the Y-axis direction. In this case, when the power storage element 100 becomes hot and expands, the time until the long side surface 111 contacts the opposing surface 315 (first surface 315a, second surface 315b) becomes shorter, and the power storage element 100 can move upward more quickly. .
  • first surface 315a and the second surface 315b are each flat. At least one of the first surface and the second surface may be curved. If it is curved, the slope is an acute angle formed by the Z-axis direction and the virtual line connecting the starting point and the ending point when viewed in the X-axis direction.
  • the case where the first surface 315a is tilted with respect to the Z-axis direction is illustrated, but the first surface 315a does not need to be tilted with respect to the Z-axis direction.
  • the length H1 of the wall portion 314 is within 1/8 of the length of the power storage element 100 in the Z-axis direction, but the length of the first wall portion in the Z-axis direction is , may be larger than 1/8 of the length of the power storage element 100 in the Z-axis direction.
  • the length of the wall portion 314 in the X-axis direction is 1/3 or more of the length of the power storage element 100 in the X-axis direction, but the length of the wall portion 314 in the X-axis direction is The length may be less than 1 ⁇ 3 of the length of power storage element 100 in the X-axis direction.
  • the wall portion 314 is a continuous portion of the bottom wall 311, so that the wall portion 314 is integrated with the bottom wall 311, but the present invention is not limited thereto.
  • the wall portion 314 is formed by joining the bottom wall 311 and a separate wall portion 314 to the bottom wall 311 by bonding with an adhesive, heat welding, laser welding, etc. It may be integrated with the wall 311.
  • the wall portion 314 is arranged between the two power storage elements 100, but not between the two power storage elements 100 but on the side (outside) of the power storage element 100 at the end. may be placed.
  • the wall 314 supports the spacer 210 in the Z-axis direction, but the spacer 210 is arranged in the Y-axis direction of the wall 314, and the wall 314 supports the spacer 210 in the Y-axis direction. 210 may be supported. The spacer 210 may not be arranged around the wall portion 314, and the wall portion 314 may not support the spacer 210.
  • the cross-sectional shape of the wall portion 314 in the YZ plane may be any shape, such as a semicircle, a semiellipse, a semiellipse, a triangle, or another polygon.
  • the spacer 200 is made of glass wool that has insulation and heat insulation properties, but the spacer may just have insulation properties.
  • the exterior body 300 (the holding member 310 and the lid member 320) is a tray and a busbar frame that sandwich the plurality of power storage elements 100 and the plurality of spacers 200 in the Z-axis direction.
  • the lid member 320 may be an insulating member or the like on which electrical equipment (electrical components) such as a board, relay, fuse, thermistor, or harness is placed, instead of a busbar frame.
  • the exterior body 300 is not configured to sandwich a plurality of power storage elements 100, etc., but is a box having a holding member 310 as a housing that accommodates a plurality of power storage elements 100, etc., and a lid member 320 as a lid body that closes an opening of the housing. It may also be a shaped container (module case).
  • the power storage element 100 is arranged with the electrode terminal 140 facing in the Z-axis positive direction, but it is arranged in an orientation with the electrode terminal 140 facing in the X-axis direction, the Y-axis direction, or the Z-axis negative direction. It may be placed in
  • the present invention can be applied to a power storage device, etc. equipped with a power storage element such as a lithium ion secondary battery.
  • Power storage device 100 Power storage element 110 Containers 200, 210, 220 Spacer 300 Exterior body 310 Holding member 311 Bottom wall 311a Projections 312, 313 Side wall (second wall) 312a Outer surface 312b Inner surface (opposing surface, second opposing surface) 314, 314C Wall part (first wall part) 314a, 314b Wall recess 315 Opposing surface (first opposing surface) 315a First surface 315b Second surface 350 Heat transfer member 351 Heat transfer wall 352 Heat transfer bottom H1 Length ⁇ , ⁇ , ⁇ Gradient

Abstract

A power storage device (1) comprises a power storage element (100) and a holding member (310) that holds the power storage element (100). The holding member (310) comprises: a bottom wall (311) that supports the power storage element (100); a first wall portion (wall portion (314)) that is disposed at a position adjacent to the power storage element (100) in a first direction and that protrudes from the bottom wall (311); and second wall portions (side walls (312) and (313)) that are disposed at positions different from that of the first wall portion and that protrude from the bottom wall (311). The first wall portion extends in a second direction (X-axis direction) that intersects the first direction (Y-axis direction). The gradient of an opposing face (315), of the first wall portion, opposite to the power storage element (100) is greater than the gradient α of the second wall portion.

Description

蓄電装置Power storage device
　本発明は、蓄電装置に関する。 The present invention relates to a power storage device.
　特許文献１には、底壁を有する保持部材（ケース本体）に対して、複数の二次電池セル（蓄電素子）が収容された二次電池装置（蓄電装置）が開示されている。 Patent Document 1 discloses a secondary battery device (power storage device) in which a plurality of secondary battery cells (power storage elements) are housed in a holding member (case body) having a bottom wall.
国際公開第２０１６／１５８３９５号International Publication No. 2016/158395
　一つの蓄電素子が過剰に高温化してしまうと、その熱が保持部材の底壁を介して、正常な蓄電素子まで伝わって悪影響を及ぼすおそれがある。 If one power storage element becomes excessively high in temperature, the heat may be transmitted to a normal power storage element through the bottom wall of the holding member and have an adverse effect.
　本発明の目的は、一つの蓄電素子から他の蓄電素子に対する熱影響を抑制することである。 An object of the present invention is to suppress the thermal influence from one power storage element to other power storage elements.
　本発明の一態様に係る蓄電装置は、蓄電素子と、前記蓄電素子を保持する保持部材と、を備え、前記保持部材は、前記蓄電素子を支持する底壁と、第一方向において前記蓄電素子に隣り合う位置に配置され、前記底壁から突出した第一壁部と、前記第一壁部とは異なる位置に配置され、前記底壁から突出した第二壁部と、を備え、前記第一壁部は、前記第一方向に交差する第二方向に延びており、前記第一壁部において前記蓄電素子に対向する対向面の勾配は、前記第二壁部の勾配よりも大きい。 A power storage device according to one aspect of the present invention includes a power storage element and a holding member that holds the power storage element, and the holding member has a bottom wall that supports the power storage element, and a bottom wall that supports the power storage element in a first direction. a first wall portion disposed adjacent to the bottom wall and protruding from the bottom wall; and a second wall portion disposed at a position different from the first wall portion and protruding from the bottom wall, the second wall portion protruding from the bottom wall. The one wall portion extends in a second direction intersecting the first direction, and the slope of the opposing surface of the first wall portion that faces the electricity storage element is greater than the slope of the second wall portion.
　本発明における蓄電装置によれば、一つの蓄電素子から他の蓄電素子に対する熱影響を抑制できる。 According to the power storage device of the present invention, thermal influence from one power storage element to other power storage elements can be suppressed.
図１は、実施の形態に係る蓄電装置の外観を示す斜視図である。FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. 図２は、実施の形態に係る蓄電装置を分解した場合の各構成要素を示す分解斜視図である。FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. 図３は、実施の形態に係る蓄電素子の構成を示す斜視図である。FIG. 3 is a perspective view showing the configuration of the power storage element according to the embodiment. 図４は、実施の形態に係る保持部材の構成を示す斜視図及び断面図である。FIG. 4 is a perspective view and a sectional view showing the structure of the holding member according to the embodiment. 図５は、実施の形態に係る保持部材が有する第一壁部の断面図である。FIG. 5 is a sectional view of the first wall portion of the holding member according to the embodiment. 図６は、実施の形態に係る保持部材に、蓄電素子及びスペーサを配置した場合の構成を示す上面図である。FIG. 6 is a top view showing a configuration in which a power storage element and a spacer are arranged in a holding member according to an embodiment. 図７は、実施の形態に係る第二壁部を示す断面図である。FIG. 7 is a sectional view showing the second wall portion according to the embodiment. 図８は、実施の形態に係る蓄電素子と壁部との状態遷移を示す説明図である。FIG. 8 is an explanatory diagram showing the state transition between the power storage element and the wall according to the embodiment. 図９は、変形例に係る第一壁部を示す断面図である。FIG. 9 is a sectional view showing a first wall portion according to a modification. 図１０は、実施の形態にかかるバスバーの構成を示す斜視図である。FIG. 10 is a perspective view showing the configuration of the bus bar according to the embodiment.
　（１）本発明の一態様に係る蓄電装置は、蓄電素子と、前記蓄電素子を保持する保持部材と、を備え、前記保持部材は、前記蓄電素子を支持する底壁と、第一方向において前記蓄電素子に隣り合う位置に配置され、前記底壁から突出した第一壁部と、前記第一壁部とは異なる位置に配置され、前記底壁から突出した第二壁部と、を備え、前記第一壁部は、前記第一方向に交差する第二方向に延びており、前記第一壁部において前記蓄電素子に対向する対向面の勾配は、前記第二壁部の勾配よりも大きい。 (1) A power storage device according to one aspect of the present invention includes a power storage element and a holding member that holds the power storage element, and the holding member is connected to a bottom wall that supports the power storage element in a first direction. A first wall portion disposed adjacent to the power storage element and protruding from the bottom wall; and a second wall portion disposed at a position different from the first wall portion and protruding from the bottom wall. , the first wall extends in a second direction intersecting the first direction, and the slope of the opposing surface of the first wall facing the electricity storage element is greater than the slope of the second wall. big.
　蓄電素子は、過剰に高温化した場合などに膨張する。蓄電素子を保持する保持部材（外装体）の壁部（第二壁部）は通常、抜き勾配を有している。蓄電素子と隣り合う位置に配置される第一壁部の対向面の勾配は第二壁部の勾配よりも大きいので、第一壁部は通常の抜き勾配よりも大きい勾配を有する。上記態様によれば、膨張した蓄電素子は、対向面に当たるとこの対向面に沿って蓄電素子が上方に移動し、保持部材の底壁から離れる。これにより、蓄電素子の熱が底壁に伝達されにくくなるため、保持部材の底壁を経由して他の蓄電素子へと熱が伝播することを抑制できる。したがって、複数並べられた蓄電素子のうち、一つの蓄電素子から他の蓄電素子に対する熱影響を抑制できる。 A power storage element expands when the temperature becomes excessively high. The wall portion (second wall portion) of the holding member (exterior body) that holds the power storage element usually has a draft angle. Since the slope of the opposing surface of the first wall portion disposed adjacent to the power storage element is larger than the slope of the second wall portion, the first wall portion has a slope larger than a normal draft angle. According to the above aspect, when the expanded power storage element hits the opposing surface, the power storage element moves upward along the opposing surface and separates from the bottom wall of the holding member. This makes it difficult for the heat of the power storage element to be transferred to the bottom wall, so it is possible to suppress the heat from propagating to other power storage elements via the bottom wall of the holding member. Therefore, it is possible to suppress the thermal influence of one power storage element among the plurality of power storage elements arranged on the other power storage elements.
　（２）上記（１）に記載の蓄電装置において、前記対向面は、前記底壁に近い位置に設けられた第一面と、前記第一面よりも前記底壁から遠い位置に設けられた第二面とを備え、前記第二面の勾配は、前記第一面の勾配よりも大きくてもよい。 (2) In the power storage device according to (1) above, the opposing surfaces include a first surface provided at a position close to the bottom wall, and a first surface provided at a position farther from the bottom wall than the first surface. a second surface, and the slope of the second surface may be greater than the slope of the first surface.
　蓄電素子が膨張する際には、蓄電素子の側面が弧状に膨らむ。このため蓄電素子の周縁部よりも内側の領域では、蓄電素子側面の法線方向における膨張時の変位量が大きい。本態様では、第二面は、第一面よりも底壁から遠い位置に配置されている。このため、第一面を蓄電素子の周縁部に対応させた位置に配置すると、第二面は、蓄電素子の周縁部よりも変位量が大きい部位に対応することとなり、蓄電素子の膨張を受け止めやすい。第二面の勾配は、第一面の勾配よりも大きいため、膨張した蓄電素子は、底壁から離れる方向にスムーズに移動できる。膨張した蓄電素子が底壁から離れる方向に移動できれば、それだけ早期に蓄電素子の熱が底壁に伝達されにくくなる。したがって、保持部材の底壁を経由して他の蓄電素子へと熱が伝播することをより抑制でき、他の蓄電素子に対する熱影響をより抑制できる。 When the power storage element expands, the side surface of the power storage element expands in an arc shape. Therefore, in a region inside the peripheral edge of the power storage element, the amount of displacement during expansion in the normal direction of the side surface of the power storage element is large. In this aspect, the second surface is located farther from the bottom wall than the first surface. Therefore, if the first surface is placed at a position corresponding to the periphery of the energy storage element, the second surface will correspond to the area where the amount of displacement is larger than the periphery of the energy storage element, and will absorb the expansion of the energy storage element. Cheap. Since the slope of the second surface is greater than the slope of the first surface, the expanded electricity storage element can smoothly move away from the bottom wall. The sooner the expanded power storage element can move away from the bottom wall, the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, the propagation of heat to other power storage elements via the bottom wall of the holding member can be further suppressed, and the influence of heat on other power storage elements can be further suppressed.
　（３）本発明の一態様に係る蓄電装置は、蓄電素子と、前記蓄電素子を保持する保持部材と、を備え、前記保持部材は、前記蓄電素子を支持する底壁と、第一方向において前記蓄電素子に隣り合う位置に配置され、前記底壁から突出した第一壁部と、を備え、前記第一壁部は、前記蓄電素子に対向する対向面を備え、前記第一壁部は、前記第一方向に交差する第二方向に延びており、前記対向面は、前記底壁に近い位置に設けられた第一面と、前記第一面よりも前記底壁から遠い位置に設けられた第二面とを備え、前記第二面の勾配は、前記第一面の勾配よりも大きい。 (3) A power storage device according to one aspect of the present invention includes a power storage element and a holding member that holds the power storage element, and the holding member is connected to a bottom wall that supports the power storage element in a first direction. a first wall portion disposed adjacent to the power storage element and protruding from the bottom wall; the first wall portion includes an opposing surface facing the power storage element; , extending in a second direction intersecting the first direction, and the opposing surfaces include a first surface provided at a position close to the bottom wall, and a first surface provided at a position farther from the bottom wall than the first surface. and a second surface having a slope, the slope of the second surface being greater than the slope of the first surface.
　蓄電素子が過剰に高温化して膨張する際には、蓄電素子の側面が弧状に膨らむ。このため蓄電素子の周縁部よりも内側の領域では、蓄電素子側面の法線方向における膨張時の変位量が大きい。本態様では、第二面は、第一面よりも底壁から遠い位置に配置されている。このため、第一面を蓄電素子の周縁部に対応させた位置に配置すると、第二面は、蓄電素子の周縁部よりも変位量が大きい部位に対応することとなり、蓄電素子の膨張を受け止めやすい。第二面の勾配は、第一面の勾配よりも大きいため、膨張した蓄電素子は、底壁から離れる方向にスムーズに移動できる。膨張した蓄電素子が底壁から離れる方向に移動できれば、それだけ早期に蓄電素子の熱が底壁に伝達されにくくなる。したがって、保持部材の底壁を経由して他の蓄電素子へと熱が伝播することを抑制でき、他の蓄電素子に対する熱影響を抑制できる。 When the power storage element becomes excessively hot and expands, the side surface of the power storage element expands in an arc shape. Therefore, in a region inside the peripheral edge of the power storage element, the amount of displacement during expansion in the normal direction of the side surface of the power storage element is large. In this aspect, the second surface is located farther from the bottom wall than the first surface. Therefore, if the first surface is placed at a position corresponding to the periphery of the energy storage element, the second surface will correspond to the area where the amount of displacement is larger than the periphery of the energy storage element, and will absorb the expansion of the energy storage element. Cheap. Since the slope of the second surface is greater than the slope of the first surface, the expanded electricity storage element can smoothly move away from the bottom wall. The sooner the expanded power storage element can move away from the bottom wall, the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, it is possible to suppress heat from propagating to other power storage elements via the bottom wall of the holding member, and it is possible to suppress thermal effects on other power storage elements.
　（４）上記（１）～（３）のいずれかひとつに記載の蓄電装置において、前記第一壁部において、前記第一方向及び前記第二方向に交差する第三方向の長さは、前記蓄電素子における前記第三方向の長さの１／８以内であってもよい。 (4) In the power storage device according to any one of (1) to (3) above, in the first wall portion, the length in the third direction intersecting the first direction and the second direction is The length may be within 1/8 of the length of the electricity storage element in the third direction.
　上述したように、蓄電素子が膨張する際には、蓄電素子の側面が弧状に膨らむ。このとき、蓄電素子の側面の周縁部の傾斜は、中央部の傾斜よりも大きくなる。本態様では、第一壁部において第三方向の長さが、蓄電素子における第三方向の長さの１／８以内であるので、膨張した蓄電素子において傾斜の大きい周縁部に対応した位置に第一壁部を配置できる。このため、第一壁部の対向面に対し、蓄電素子の傾斜の大きい周縁部を接触させられる。これにより、膨張した蓄電素子を、底壁から離れる方向にスムーズに移動できる。スムーズに蓄電素子を移動できれば、それだけ早期に蓄電素子の熱が底壁に伝達されにくくなる。したがって、保持部材の底壁を経由して他の蓄電素子へと熱が伝播することをより抑制でき、他の蓄電素子に対する熱影響をより抑制できる。 As described above, when the power storage element expands, the side surface of the power storage element expands in an arc shape. At this time, the slope of the peripheral edge portion of the side surface of the power storage element is larger than the slope of the center portion. In this aspect, since the length of the first wall in the third direction is within 1/8 of the length of the electricity storage element in the third direction, the expanded electricity storage element is placed at a position corresponding to the peripheral edge with a large inclination. A first wall can be placed. Therefore, the peripheral edge portion of the power storage element having a large slope can be brought into contact with the opposing surface of the first wall portion. Thereby, the expanded electricity storage element can be smoothly moved in a direction away from the bottom wall. The smoother the power storage element can be moved, the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, the propagation of heat to other power storage elements via the bottom wall of the holding member can be further suppressed, and the influence of heat on other power storage elements can be further suppressed.
　（５）上記（１）～（４）のいずれかひとつに記載の蓄電装置において、前記第一壁部は、前記蓄電素子における前記第二方向の中央部に対向して配置されていてもよい。 (5) In the power storage device according to any one of (1) to (4) above, the first wall portion may be arranged to face a central portion of the power storage element in the second direction. .
　これによれば、第一壁部が、蓄電素子における第二方向の中央部に対向して配置されているので、第二方向においても蓄電素子の膨張の大きい箇所に対向面が配置される。これにより、膨張した蓄電素子を、対向面によって底壁から離れる方向にスムーズに移動できる。スムーズに蓄電素子を移動できれば、それだけ早期に蓄電素子の熱が底壁に伝達されにくくなる。したがって、保持部材の底壁を経由して他の蓄電素子へと熱が伝播することをより抑制でき、他の蓄電素子に対する熱影響をより抑制できる。 According to this, since the first wall portion is arranged to face the central part of the power storage element in the second direction, the opposing surface is arranged at a location where the expansion of the power storage element is large in the second direction as well. Thereby, the expanded electricity storage element can be smoothly moved in a direction away from the bottom wall by the opposing surface. The smoother the power storage element can be moved, the sooner the heat of the power storage element will be less likely to be transferred to the bottom wall. Therefore, the propagation of heat to other power storage elements via the bottom wall of the holding member can be further suppressed, and the influence of heat on other power storage elements can be further suppressed.
　（６）上記（１）～（５）のいずれかひとつに記載の蓄電装置において、複数の前記蓄電素子と、隣り合う前記蓄電素子同士を接続するバスバーとを備え、前記バスバーは、前記バスバーの、隣り合う前記蓄電装置が並ぶ方向における中間部に曲げ部を備えてもよい。 (6) The power storage device according to any one of (1) to (5) above, including a plurality of the power storage elements and a bus bar that connects the adjacent power storage elements, and the bus bar is connected to the bus bar. , a bent portion may be provided at an intermediate portion in a direction in which the adjacent power storage devices are lined up.
　これによれば、複数の蓄電素子がバスバーで接続されて使用される際に、バスバーが曲げ部を備えるため、当該曲げ部が応力に追従できる。膨張した蓄電素子が保持部材から離れる方向に移動した際には、当該蓄電素子に接続されたバスバーは応力を受ける。バスバーの曲げ部が当該応力に追従できるため、膨張した蓄電素子が保持部材からスムーズに移動できる。 According to this, when a plurality of power storage elements are connected by a bus bar and used, since the bus bar includes a bent portion, the bent portion can follow stress. When the expanded power storage element moves in a direction away from the holding member, the bus bar connected to the power storage element is subjected to stress. Since the bent portion of the bus bar can follow the stress, the expanded electricity storage element can be smoothly moved from the holding member.
　（７）上記（１）～（６）のいずれかひとつに記載の蓄電装置において、前記蓄電素子と前記保持部材とが並ぶ方向において、前記保持部材とで前記蓄電素子を挟む位置に配置される金属製の蓋体を備えてもよい。 (7) In the power storage device according to any one of (1) to (6) above, the power storage device is arranged at a position where the power storage element is sandwiched between the power storage element and the holding member in a direction in which the power storage element and the holding member are lined up. It may also include a metal lid.
　これによれば、蓄電素子は、保持部材と蓋体とで挟まれている。蓄電素子が膨張して、保持部材から離れる方向に移動すると、当該蓄電素子は蓋体に接近する。蓋体は金属製であるため、当該蓄電素子の熱を効果的に放熱できる。よって、蓄電素子が膨張した際に、他の蓄電素子に対する熱影響をより抑制できる。 According to this, the electricity storage element is sandwiched between the holding member and the lid. When the power storage element expands and moves away from the holding member, the power storage element approaches the lid. Since the lid body is made of metal, it can effectively radiate heat from the electricity storage element. Therefore, when a power storage element expands, thermal effects on other power storage elements can be further suppressed.
　（８）上記（１）～（７）のいずれかひとつに記載の蓄電装置において、前記第一壁部は、前記保持部材よりも熱伝導率の高い伝熱部材を含んでもよい。 (8) In the power storage device according to any one of (1) to (7) above, the first wall portion may include a heat transfer member having higher thermal conductivity than the holding member.
　これによれば、第一壁部は、伝熱部材を含んでいるので、膨張した蓄電素子が第一壁部の対向面に接触すると、当該蓄電素子の熱が伝熱部材に伝わり、放熱される。これにより膨張した蓄電素子から、他の蓄電素子へと熱が伝播することを抑制でき、他の蓄電素子に対する熱影響をより抑制できる。 According to this, since the first wall includes the heat transfer member, when the expanded electricity storage element contacts the opposing surface of the first wall, the heat of the electricity storage element is transferred to the heat transfer member and is radiated. Ru. This can suppress heat from propagating from the expanded power storage element to other power storage elements, and can further suppress thermal effects on other power storage elements.
　（実施の形態）
　以下、図面を参照しながら、本発明の実施の形態（その変形例も含む）に係る蓄電装置について説明する。以下で説明する実施の形態は、いずれも包括的または具体的な例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、製造工程、製造工程の順序等は、一例であり、本発明を限定する主旨ではない。各図において、寸法等は厳密に図示したものではない。各図において、同一または同様な構成要素については同じ符号を付している。 (Embodiment)
Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing steps, order of manufacturing steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. In each figure, dimensions etc. are not strictly illustrated. In each figure, the same or similar components are designated by the same reference numerals.
　以下の記述及び図面中に示される方向について説明する。１つの蓄電素子における一対（正極及び負極）の電極端子の並び方向、蓄電素子の容器の短側面の対向方向、または、保持部材の短手方向を、Ｘ軸方向と定義する。複数の蓄電素子の並び方向、蓄電素子の容器の長側面の対向方向、蓄電素子及びスペーサの並び方向、または、保持部材の長手方向を、Ｙ軸方向と定義する。保持部材の底壁及び蓄電素子の並び方向、蓄電素子の電極端子の突出方向、外装体の本体及び蓋体（保持部材及び蓋部材）の並び方向、外装体支持体の本体及び蓋体（第一支持体及び第二支持体）の並び方向、または、上下方向を、Ｚ軸方向と定義する。これらＸ軸方向、Ｙ軸方向及びＺ軸方向は、互いに交差（本実施の形態では直交）する方向である。使用態様によってはＺ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Ｚ軸方向を上下方向として説明する。 The directions shown in the following description and drawings will be explained. The direction in which a pair of electrode terminals (positive electrode and negative electrode) in one power storage element are arranged, the opposing direction of the short sides of the container of the power storage element, or the short direction of the holding member is defined as the X-axis direction. The direction in which the plurality of power storage elements are lined up, the direction in which the long sides of the container of the power storage elements face each other, the direction in which the power storage elements and spacers are lined up, or the longitudinal direction of the holding member is defined as the Y-axis direction. The arrangement direction of the bottom wall of the holding member and the power storage element, the protruding direction of the electrode terminal of the power storage element, the arrangement direction of the main body and the lid (the holding member and the lid member) of the exterior body, the main body and the lid body (the first The direction in which the first support and the second support are lined up or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Depending on the usage mode, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
　以下の説明において、Ｘ軸プラス方向とは、Ｘ軸の矢印方向を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対方向を示す。単にＸ軸方向という場合は、Ｘ軸プラス方向及びＸ軸マイナス方向の双方向またはいずれか一方の方向を示す。Ｙ軸方向及びＺ軸方向についても同様である。以下では、Ｙ軸方向を第一方向とも呼び、Ｘ軸方向を第二方向とも呼び、Ｚ軸方向を第三方向とも呼ぶ。平行及び直交などの、相対的な方向または姿勢を示す表現は、厳密には、その方向または姿勢ではない場合も含む。２つの方向が平行であるとは、当該２つの方向が完全に平行であることを意味するだけでなく、実質的に平行であること、すなわち、数％程度の差異を含むことも意味する。以下の説明において、「絶縁」と表現する場合、「電気的な絶縁」を意味する。 In the following description, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction to the X-axis plus direction. When simply referred to as the X-axis direction, it refers to both or one of the X-axis plus direction and the X-axis minus direction. The same applies to the Y-axis direction and the Z-axis direction. Hereinafter, the Y-axis direction will also be referred to as the first direction, the X-axis direction will also be referred to as the second direction, and the Z-axis direction will also be referred to as the third direction. Expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. When two directions are parallel, it does not only mean that the two directions are completely parallel, but also that they are substantially parallel, that is, there is a difference of several percent. In the following description, when the expression "insulation" is used, it means "electrical insulation".
　以下の説明において、勾配とは、蓄電装置を構成する部材の面がＺ軸方向（第三方向）となす鋭角側の角度である。 In the following description, the slope is the acute angle that the surface of the member constituting the power storage device makes with the Z-axis direction (third direction).
　［１　蓄電装置１の全般的な説明］
　まず、本実施の形態における蓄電装置１の全般的な説明を行う。図１は、実施の形態に係る蓄電装置１の外観を示す斜視図である。図２は、実施の形態に係る蓄電装置１を分解した場合の各構成要素を示す分解斜視図である。 [1 General description of power storage device 1]
First, a general description of power storage device 1 in this embodiment will be given. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the embodiment is disassembled.
　蓄電装置１は、外部からの電気を充電し、また外部へ電気を放電できる装置であり、本実施の形態では、略直方体形状を有している。蓄電装置１は、電力貯蔵用途または電源用途等に使用される電池モジュール（組電池）である。具体的には、蓄電装置１は、自動車、自動二輪車、ウォータークラフト、船舶、スノーモービル、農業機械、建設機械、または、電気鉄道用の鉄道車両等の移動体の駆動用またはエンジン始動用等のバッテリ等として用いられる。上記の自動車としては、電気自動車（ＥＶ）、ハイブリッド電気自動車（ＨＥＶ）、プラグインハイブリッド電気自動車（ＰＨＥＶ）、及び、化石燃料（ガソリン、軽油、液化天然ガス等）自動車が例示される。上記の電気鉄道用の鉄道車両としては、電車、モノレール、リニアモーターカー、並びに、ディーゼル機関及び電気モーターの両方を備えるハイブリッド電車が例示される。蓄電装置１は、家庭用または事業用等に使用される定置用のバッテリ等としても用いることができる。 The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. The power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like. Specifically, the power storage device 1 is used for driving or starting an engine of a moving object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. Used as batteries, etc. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
　図１に示すように、蓄電装置１は、蓄電ユニット１０と、蓄電ユニット１０に取り付けられる基板ユニット２０と、を備えている。蓄電ユニット１０は、Ｙ軸方向に長尺の略直方体形状を有している。基板ユニット２０は、蓄電ユニット１０が有する蓄電素子１００の状態の監視、及び、蓄電素子１００の制御を行うことができる機器であり、内方に回路基板等を有している。本実施の形態では、基板ユニット２０は、蓄電ユニット１０の長手方向の端部、つまり、蓄電ユニット１０のＹ軸マイナス方向の側面に取り付けられる扁平な矩形状の部材である。 As shown in FIG. 1, the power storage device 1 includes a power storage unit 10 and a board unit 20 attached to the power storage unit 10. The power storage unit 10 has a substantially rectangular parallelepiped shape that is elongated in the Y-axis direction. The board unit 20 is a device that can monitor the state of the power storage element 100 included in the power storage unit 10 and control the power storage element 100, and has a circuit board and the like inside. In the present embodiment, the substrate unit 20 is a flat rectangular member that is attached to the end of the power storage unit 10 in the longitudinal direction, that is, to the side surface of the power storage unit 10 in the negative direction of the Y-axis.
　さらに図２に示すように、蓄電ユニット１０は、複数の蓄電素子１００と、複数のスペーサ２００と、外装体３００と、複数のバスバー４００と、外装体支持体５００と、ケーブル４１０及び４２０と、を有している。 Further, as shown in FIG. 2, the power storage unit 10 includes a plurality of power storage elements 100, a plurality of spacers 200, an exterior body 300, a plurality of bus bars 400, an exterior body support 500, cables 410 and 420, have.
　蓄電素子１００は、電気を充電し、電気を放電できる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池等の非水電解質二次電池である。蓄電素子１００は、扁平な直方体形状（角形）を有しており、本実施の形態では、１４個の蓄電素子１００がＹ軸方向に並んで配列されている。蓄電素子１００の大きさ、形状、及び、配列される蓄電素子１００の個数等は限定されず、１つの蓄電素子１００しか配置されていなくてもよい。蓄電素子１００は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子１００は、二次電池ではなく、使用者が充電をしなくても蓄えられている電気を使用できる一次電池であってもよい。蓄電素子１００は、固体電解質を用いた電池であってもよい。蓄電素子１００は、パウチタイプの蓄電素子であってもよい。蓄電素子１００の構成の詳細な説明については、後述する。 The power storage element 100 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 100 has a flat rectangular parallelepiped shape (prismatic shape), and in this embodiment, 14 power storage elements 100 are arranged in a line in the Y-axis direction. The size and shape of power storage element 100, the number of power storage elements 100 arranged, etc. are not limited, and only one power storage element 100 may be arranged. The power storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor. The power storage element 100 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. Power storage element 100 may be a battery using a solid electrolyte. The power storage element 100 may be a pouch type power storage element. A detailed description of the configuration of power storage element 100 will be described later.
　スペーサ２００（２１０、２２０）は、Ｙ軸方向（第一方向）において蓄電素子１００と隣り合って配置され、蓄電素子１００と他の部材とを断熱及び／又は絶縁する平板状かつ矩形状の部材である。スペーサ２００は、蓄電素子１００のＹ軸プラス方向またはＹ軸マイナス方向に配置されて、蓄電素子１００同士または蓄電素子１００と外装体支持体５００とを断熱及び／又は絶縁する断熱板または絶縁板である。スペーサ２００は、グラスウールまたはマイカ等の断熱性を有する部材、または、後述の外装体３００に使用可能ないずれかの樹脂材料等の絶縁性を有する部材等で形成されている。スペーサ２００のうちのスペーサ２１０とスペーサ２２０とは、同じ材質の部材で形成されていてもよいし、異なる材質の部材で形成されていてもよい。 The spacer 200 (210, 220) is a flat rectangular member that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction) and heats and/or insulates the power storage element 100 and other members. It is. The spacer 200 is a heat insulating plate or an insulating plate that is arranged in the positive Y-axis direction or the negative Y-axis direction of the power storage element 100 and heats and/or insulates the power storage elements 100 from each other or the power storage element 100 and the exterior body support 500. be. The spacer 200 is formed of a member having heat insulating properties such as glass wool or mica, or a member having insulating properties such as any resin material that can be used for the exterior body 300 described below. Spacer 210 and spacer 220 of spacer 200 may be made of the same material, or may be made of different materials.
　本実施の形態では、スペーサ２００は、断熱性を有するグラスウールで形成されている。スペーサ２００の熱伝導率は、保持部材３１０の熱伝導率よりも小さい。隣り合う蓄電素子１００の間にスペーサ２００が配置されるので、一つの蓄電素子が高温化した場合に、隣の蓄電素子に高温化した蓄電素子の熱が伝わることを抑制できる。 In this embodiment, the spacer 200 is made of glass wool that has heat insulating properties. The thermal conductivity of the spacer 200 is lower than that of the holding member 310. Since the spacer 200 is arranged between adjacent power storage elements 100, when one power storage element becomes high in temperature, it is possible to suppress the heat of the high temperature power storage element from being transmitted to the adjacent power storage element.
　スペーサ２００のうちのスペーサ２１０は、隣り合う２つの蓄電素子１００の間に配置され、当該２つの蓄電素子１００の間を断熱及び／又は絶縁する、ＸＺ平面に平行な平板状かつ矩形状のスペーサ（中間スペーサ）である。具体的には、スペーサ２１０は、当該２つの蓄電素子１００が有する後述の容器１１０の長側面１１１同士の間において、当該長側面１１１と対向して配置される。本実施の形態では、１３枚のスペーサ２１０が１４個の蓄電素子１００とＹ軸方向に交互に並んで配置されているが、蓄電素子１００の数が１４個以外の場合には、スペーサ２１０の数も蓄電素子１００の数に応じて適宜変更される。スペーサ２１０は、全ての蓄電素子１００同士の間に配置されることには限定されず、いずれかの蓄電素子１００同士の間にはスペーサ２１０が配置されない構成でもよい。全てのスペーサ２１０が同じ材質の部材で形成されていてもよいし、いずれかのスペーサ２１０が異なる材質の部材で形成されていてもよい。 The spacer 210 of the spacers 200 is a flat rectangular spacer parallel to the XZ plane that is arranged between two adjacent power storage elements 100 and insulates and/or insulates between the two power storage elements 100. (intermediate spacer). Specifically, spacer 210 is disposed between long sides 111 of containers 110, which will be described later, of the two power storage elements 100, facing the long sides 111. In this embodiment, 13 spacers 210 and 14 power storage elements 100 are arranged alternately in the Y-axis direction, but when the number of power storage elements 100 is other than 14, the spacers 210 The number is also changed as appropriate depending on the number of power storage elements 100. The spacer 210 is not limited to being arranged between all of the power storage elements 100, and a configuration may be adopted in which the spacer 210 is not arranged between any of the power storage elements 100. All the spacers 210 may be made of the same material, or any of the spacers 210 may be made of different materials.
　スペーサ２００のうちのスペーサ２２０は、端部の蓄電素子１００と外装体支持体５００の側壁との間に配置され、当該端部の蓄電素子１００と外装体支持体５００の側壁との間を断熱及び／又は絶縁する、ＸＺ平面に平行な平板状かつ矩形状のスペーサ（エンドスペーサ）である。Ｙ軸方向両端部に位置する蓄電素子１００と外装体支持体５００のＹ軸方向両端部の側壁との間に、２つのスペーサ２２０が配置される。具体的には、スペーサ２２０は、Ｙ軸方向端部の蓄電素子１００の容器１１０の長側面１１１と外装体支持体５００のＹ軸方向に対向する側壁との間において、当該長側面１１１及び外装体支持体５００の当該側壁と対向して配置される。２つのスペーサ２２０は、同じ材質の部材で形成されていてもよいし、異なる材質の部材で形成されていてもよい。 The spacer 220 of the spacers 200 is disposed between the power storage element 100 at the end and the side wall of the exterior body support 500, and provides insulation between the power storage element 100 at the end and the side wall of the exterior body support 500. and/or an insulating flat rectangular spacer (end spacer) parallel to the XZ plane. Two spacers 220 are arranged between the power storage elements 100 located at both ends in the Y-axis direction and the side walls of the exterior body support 500 at both ends in the Y-axis direction. Specifically, the spacer 220 is arranged between the long side surface 111 of the container 110 of the power storage element 100 at the end in the Y-axis direction and the side wall of the exterior body support 500 facing in the Y-axis direction. It is arranged opposite to the side wall of the body support 500. The two spacers 220 may be made of the same material, or may be made of different materials.
　外装体３００は、複数の蓄電素子１００及び複数のスペーサ２００の外方に配置され、当該複数の蓄電素子１００等を覆う筐体（蓄電ユニット１０の外殻）を構成する部材である。具体的には、外装体３００は、複数の蓄電素子１００及び複数のスペーサ２００をＺ軸方向で挟むように、当該複数の蓄電素子１００のＺ軸方向両側に配置され、当該複数の蓄電素子１００等のＺ軸方向両端部を覆う。これにより、外装体３００は、複数の蓄電素子１００及び複数のスペーサ２００を所定の位置で固定する。 The exterior body 300 is a member that is arranged outside of the plurality of power storage elements 100 and the plurality of spacers 200 and forms a casing (outer shell of the power storage unit 10) that covers the plurality of power storage elements 100 and the like. Specifically, the exterior body 300 is arranged on both sides of the plurality of power storage elements 100 in the Z-axis direction so as to sandwich the plurality of power storage elements 100 and the plurality of spacers 200 in the Z-axis direction. Covers both ends in the Z-axis direction. Thereby, the exterior body 300 fixes the plurality of power storage elements 100 and the plurality of spacers 200 at predetermined positions.
　外装体３００は、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタラート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ポリアミド（ＰＡ）、ＡＢＳ樹脂、若しくは、それらの複合材料等の絶縁部材、または、絶縁塗装をした金属等により形成されている。外装体３００は、これにより、蓄電素子１００等が外部の金属部材等に接触することを回避する。蓄電素子１００等の絶縁性が保たれる構成であれば、外装体３００は、金属等の導電部材で形成されてもよい。 The exterior body 300 is made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET). , polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA), ABS It is formed of an insulating member such as resin or a composite material thereof, or metal coated with an insulating coating. Exterior body 300 thereby prevents power storage element 100 and the like from coming into contact with external metal members and the like. Exterior body 300 may be formed of a conductive member such as metal, as long as the insulation of power storage element 100 and the like is maintained.
　外装体３００は、外装体３００の下側部材を構成する保持部材３１０と、外装体３００の上側部材を構成する蓋部材３２０と、を有している。保持部材３１０及び蓋部材３２０は、同じ材質の部材で形成されていてもよいし、異なる材質の部材で形成されていてもよい。 The exterior body 300 includes a holding member 310 that constitutes a lower member of the exterior body 300 and a lid member 320 that constitutes an upper member of the exterior body 300. The holding member 310 and the lid member 320 may be made of the same material, or may be made of different materials.
　保持部材３１０は、Ｙ軸方向に長尺なトレイである。具体的には、保持部材３１０は、複数の蓄電素子１００及び複数のスペーサ２００のＺ軸マイナス方向に配置されて、当該複数の蓄電素子１００及び複数のスペーサ２００を保持するＹ軸方向に長尺かつ深さが浅い浅箱状（扁平な略直方体形状）のトレイである。保持部材３１０の構成の詳細な説明については、後述する。 The holding member 310 is a tray that is elongated in the Y-axis direction. Specifically, the holding member 310 is arranged in the negative Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 200, and is elongated in the Y-axis direction to hold the plurality of power storage elements 100 and the plurality of spacers 200. It is a shallow box-shaped (flat, substantially rectangular parallelepiped) tray with a shallow depth. A detailed description of the configuration of the holding member 310 will be given later.
　蓋部材３２０は、複数の蓄電素子１００及び複数のスペーサ２００のＺ軸プラス方向に配置されて、複数の蓄電素子１００に支持されるＹ軸方向に長尺な箱形（扁平な略直方体形状）の部材である。蓋部材３２０は、後述の外装体支持体５００の第二支持体５２０と蓄電素子１００との間に配置されるため、蓄電ユニット１０の内蓋であるとも言える。本実施の形態では、蓋部材３２０は、バスバーフレーム（バスバーホルダまたはバスバープレートとも言う）であり、バスバー４００と他の部材との絶縁、及び、バスバー４００の位置規制等を行う。具体的には、蓋部材３２０が、複数の蓄電素子１００上に配置されて複数の蓄電素子１００に対して位置決めされ、かつ、複数のバスバー４００が、蓋部材３２０に対して位置決めされる。これにより、各バスバー４００は、複数の蓄電素子１００に対して位置決めされて、当該複数の蓄電素子１００が有する電極端子１４０に接合される。 The lid member 320 is arranged in the Z-axis positive direction of the plurality of power storage elements 100 and the plurality of spacers 200, and has a box shape (flat substantially rectangular parallelepiped shape) that is elongated in the Y-axis direction and supported by the plurality of power storage elements 100. It is a member of Since the lid member 320 is disposed between the second support body 520 of the exterior body support body 500 and the power storage element 100, which will be described later, it can also be said that the lid member 320 is the inner lid of the power storage unit 10. In this embodiment, the lid member 320 is a busbar frame (also referred to as a busbar holder or a busbar plate), and serves to insulate the busbar 400 from other members, regulate the position of the busbar 400, and the like. Specifically, the lid member 320 is disposed on the plurality of power storage elements 100 and positioned with respect to the plurality of power storage elements 100, and the plurality of bus bars 400 are positioned with respect to the lid member 320. Thereby, each bus bar 400 is positioned with respect to the plurality of power storage elements 100 and joined to the electrode terminal 140 that the plurality of power storage elements 100 have.
　バスバー４００は、複数の蓄電素子１００上に配置され、複数の蓄電素子１００の電極端子１４０同士を電気的に接続する矩形状の板状部材である。本実施の形態では、バスバー４００と電極端子１４０とは、ボルト接続（接合）されるが、溶接等で接続（接合）されてもよい。バスバー４００は、アルミニウム、アルミニウム合金、銅、銅合金、ニッケル等の金属製の導電部材若しくはそれらの組み合わせ、または、金属以外の導電性の部材等で形成されている。本実施の形態では、バスバー４００は、隣り合う蓄電素子１００の電極端子１４０同士を接続することで、１４個の蓄電素子１００を直列に接続するが、蓄電素子１００の接続態様は上記には限定されず、直列接続及び並列接続がどのように組み合わされてもよい。 The bus bar 400 is a rectangular plate-like member that is arranged on the plurality of power storage elements 100 and electrically connects the electrode terminals 140 of the plurality of power storage elements 100. In this embodiment, bus bar 400 and electrode terminal 140 are connected (joined) with bolts, but they may be connected (joined) by welding or the like. The bus bar 400 is formed of a metal conductive member such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal. In the present embodiment, bus bar 400 connects 14 power storage elements 100 in series by connecting electrode terminals 140 of adjacent power storage elements 100, but the connection mode of power storage elements 100 is limited to the above. However, any combination of series and parallel connections may be used.
　図２、図１０に示すように、バスバー４００は、電極端子１４０と接続される一対の接続部４０１と、中間部４０２と、曲げ部４０３とを有している。中間部４０２と曲げ部４０３とは、同一の部位である。一対の接続部４０１において、隣り合う蓄電素子１００の電極端子１４０とバスバー４００とが接続される。バスバー４００は、一対の接続部４０１が並んで位置する範囲の中間位置に中間部４０２を有している。中間部４０２では、さらに曲げ部４０３が形成されている。曲げ部４０３は、金属製の板状部材であるバスバー４００を中間部４０２でＺ軸方向にＵ字状に曲げて形成されている。曲げ部４０３は、バスバー４００に作用する応力に追従できる。中間部４０２は、バスバー４００の、隣り合う蓄電素子１００が並ぶ方向における中間部でもある。曲げ部は溝として形成されてもよい。 As shown in FIGS. 2 and 10, the bus bar 400 has a pair of connecting portions 401 that are connected to the electrode terminals 140, an intermediate portion 402, and a bent portion 403. The intermediate portion 402 and the bent portion 403 are the same portion. At a pair of connecting portions 401, electrode terminals 140 of adjacent power storage elements 100 and bus bars 400 are connected. The bus bar 400 has an intermediate portion 402 located in the middle of the range where the pair of connecting portions 401 are located side by side. In the intermediate portion 402, a bent portion 403 is further formed. The bent portion 403 is formed by bending the bus bar 400, which is a metal plate-like member, into a U-shape in the Z-axis direction at the intermediate portion 402. The bending portion 403 can follow the stress acting on the bus bar 400. Intermediate portion 402 is also an intermediate portion of bus bar 400 in the direction in which adjacent power storage elements 100 are lined up. The bend may be formed as a groove.
　複数の蓄電素子１００のうちのＹ軸方向両端部に位置する蓄電素子１００が有する電極端子１４０が、ケーブル４１０及び４２０に接続されることにより、蓄電装置１が、外部からの電気を充電し、また外部へ電気を放電できる。ケーブル４１０及び４２０は、蓄電装置１（蓄電素子１００）を充放電するための電流が流れる正極及び負極の電線（電源ケーブル）である。 By connecting the electrode terminals 140 of the power storage elements 100 located at both ends in the Y-axis direction of the plurality of power storage elements 100 to the cables 410 and 420, the power storage device 1 charges with electricity from the outside, It can also discharge electricity to the outside. Cables 410 and 420 are positive and negative electric wires (power cables) through which current flows for charging and discharging power storage device 1 (power storage element 100).
　外装体支持体５００は、外装体３００を支持し、保護（補強）する部材である。外装体支持体５００は、ステンレス鋼、アルミニウム、アルミニウム合金、鉄、メッキ鋼板等の金属製の部材等により形成されている。外装体支持体５００は、外装体支持体５００の本体を構成する第一支持体５１０と、外装体支持体５００の蓋体を構成する第二支持体５２０と、を有している。第一支持体５１０及び第二支持体５２０は、同じ材質の部材で形成されていてもよいし、異なる材質の部材で形成されていてもよい。 The exterior body support 500 is a member that supports and protects (reinforces) the exterior body 300. The exterior support 500 is made of a metal member such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. The exterior body support 500 has a first support body 510 that constitutes the main body of the exterior body support body 500 and a second support body 520 that constitutes the lid body of the exterior body support body 500. The first support body 510 and the second support body 520 may be made of the same material, or may be made of different materials.
　第一支持体５１０は、保持部材３１０が配置されて保持部材３１０を下方（Ｚ軸マイナス方向）から支持する部材であり、底壁５１１と、接続部５１２及び５１３と、を有している。底壁５１１は、蓄電ユニット１０の底壁を構成する、ＸＹ平面に平行かつＹ軸方向に延びる平板状かつ矩形状の部位であり、保持部材３１０のＺ軸マイナス方向に配置される。接続部５１２は、底壁５１１のＹ軸マイナス方向端部からＺ軸プラス方向に立設され、かつ、Ｙ軸マイナス方向に突出する板状の部位であり、第二支持体５２０と接続される。接続部５１３は、底壁５１１のＹ軸プラス方向端部からＺ軸プラス方向に立設され、かつ、Ｙ軸プラス方向に突出する板状の部位であり、第二支持体５２０と接続される。 The first support body 510 is a member on which the holding member 310 is disposed and supports the holding member 310 from below (Z-axis negative direction), and has a bottom wall 511 and connection parts 512 and 513. The bottom wall 511 is a flat, rectangular portion that constitutes the bottom wall of the power storage unit 10 and extends in the Y-axis direction and parallel to the XY plane, and is arranged in the negative Z-axis direction of the holding member 310. The connecting portion 512 is a plate-shaped portion that stands upright in the Z-axis positive direction from the Y-axis negative end of the bottom wall 511 and protrudes in the Y-axis negative direction, and is connected to the second support 520. . The connecting portion 513 is a plate-shaped portion that stands upright in the Z-axis positive direction from the Y-axis positive direction end of the bottom wall 511 and protrudes in the Y-axis positive direction, and is connected to the second support body 520. .
　第二支持体５２０は、蓋部材３２０の上方（Ｚ軸プラス方向）から蓋部材３２０を押圧して支持する部材であり、天面部５２１と、接続部５２２及び５２３と、を有している。天面部５２１は、蓄電ユニット１０の上面部（外蓋）を構成する、ＸＹ平面に平行かつＹ軸方向に延びる平板状かつ矩形状の部位であり、蓋部材３２０のＺ軸プラス方向に配置される。接続部５２２は、天面部５２１のＹ軸マイナス方向端部からＺ軸マイナス方向に延び、かつ、Ｙ軸マイナス方向に突出する部位であり、第一支持体５１０の接続部５１２と接続される。接続部５２３は、天面部５２１のＹ軸プラス方向端部からＺ軸マイナス方向に延び、かつ、Ｙ軸プラス方向に突出する部位であり、第一支持体５１０の接続部５１３と接続される。第二支持体５２０は、蓋体の一例である。 The second support body 520 is a member that presses and supports the lid member 320 from above (Z-axis positive direction), and has a top surface portion 521 and connection portions 522 and 523. The top surface portion 521 is a flat, rectangular portion that constitutes the top surface portion (outer lid) of the power storage unit 10 and extends in the Y-axis direction and parallel to the XY plane, and is arranged in the positive Z-axis direction of the lid member 320. Ru. The connecting portion 522 is a portion that extends in the negative Z-axis direction from the end of the top surface portion 521 in the negative Y-axis direction and projects in the negative Y-axis direction, and is connected to the connecting portion 512 of the first support body 510 . The connecting portion 523 is a portion that extends from the end of the top surface portion 521 in the Y-axis positive direction in the Z-axis negative direction and projects in the Y-axis positive direction, and is connected to the connecting portion 513 of the first support body 510. The second support body 520 is an example of a lid body.
　このように、第一支持体５１０及び第二支持体５２０は、保持部材３１０及び蓋部材３２０をＺ軸方向から挟み込んだ状態で、接続部５１２及び５１３と接続部５２２及び５２３とがネジ止め等で接続（接合）されることで固定される構成となっている。これにより、外装体支持体５００は、外装体３００を支持（保持）する。第二支持体５２０は、蓄電素子１００と保持部材３１０とが並ぶ方向において、保持部材３１０とで複数の蓄電素子１００を挟んでいる。蓄電素子１００と保持部材３１０とが並ぶ方向は第三方向でもある。 In this way, the first support body 510 and the second support body 520 are arranged such that the connecting portions 512 and 513 and the connecting portions 522 and 523 are secured with screws or the like, with the holding member 310 and the lid member 320 being sandwiched from the Z-axis direction. It is configured to be fixed by being connected (joined) with. Thereby, the exterior body support body 500 supports (holds) the exterior body 300. The second support body 520 sandwiches the plurality of power storage elements 100 with the holding member 310 in the direction in which the power storage elements 100 and the holding member 310 are lined up. The direction in which power storage element 100 and holding member 310 are lined up is also the third direction.
　［２　蓄電素子１００の説明］
　次に、蓄電素子１００の構成について、詳細に説明する。図３は、実施の形態に係る蓄電素子１００の構成を示す斜視図である。図３は、図２に示した複数の蓄電素子１００のうちの１つの蓄電素子１００の外観を拡大して示している。当該複数の蓄電素子１００は、全て同様の構成を有しているため、以下では、１つの蓄電素子１００の構成について詳細に説明する。 [2 Description of power storage element 100]
Next, the configuration of power storage element 100 will be described in detail. FIG. 3 is a perspective view showing the configuration of power storage element 100 according to the embodiment. FIG. 3 shows an enlarged appearance of one power storage element 100 among the plurality of power storage elements 100 shown in FIG. 2 . Since all of the plurality of power storage elements 100 have the same configuration, the configuration of one power storage element 100 will be described in detail below.
　図３に示すように、蓄電素子１００は、略直方体の形状を有している。蓄電素子１００は、容器１１０と、一対（正極及び負極）の電極端子１４０と、を備えている。容器１１０の内方には、電極体、一対（正極及び負極）の集電体、及び、電解液（非水電解質）等が収容されているが、これらの図示は省略する。当該電解液としては、蓄電素子１００の性能を損なうものでなければその種類に特に制限はなく、様々なものを選択できる。蓄電素子１００は、容器１１０と電極端子１４０及び集電体との間を絶縁し、かつ封止する絶縁性のガスケットを備えているが、この図示も省略する。 As shown in FIG. 3, the power storage element 100 has a substantially rectangular parallelepiped shape. The power storage element 100 includes a container 110 and a pair of electrode terminals 140 (a positive electrode and a negative electrode). Inside the container 110, an electrode body, a pair of current collectors (a positive electrode and a negative electrode), an electrolytic solution (nonaqueous electrolyte), and the like are housed, but illustration thereof is omitted. The type of electrolytic solution is not particularly limited as long as it does not impair the performance of power storage element 100, and various types can be selected. Although the power storage element 100 includes an insulating gasket that insulates and seals between the container 110, the electrode terminal 140, and the current collector, illustration of this gasket is also omitted.
　蓄電素子１００は、上記の構成要素の他、電極体の側方または下方等に配置されるスペーサ、及び、電極体等を包み込む絶縁フィルム等を有してもよい。容器１１０の周囲には、容器１１０の外面を覆う絶縁フィルム（シュリンクチューブ等）が配置されていてもよい。当該絶縁フィルムの材質は、蓄電素子１００に必要な絶縁性を確保できるものであれば特に限定されない。が、絶縁フィルムとして、ＰＣ、ＰＰ、ＰＥ、ＰＰＳ、ＰＥＴ、ＰＢＴまたはＡＢＳ樹脂等の絶縁性の樹脂、エポキシ樹脂、カプトン（登録商標）、テフロン（登録商標）、シリコン、ポリイソプレン、及びポリ塩化ビニル等が例示される。 In addition to the above-mentioned components, the power storage element 100 may include a spacer placed on the side or below the electrode body, an insulating film that wraps around the electrode body, and the like. An insulating film (such as a shrink tube) may be placed around the container 110 to cover the outer surface of the container 110. The material of the insulating film is not particularly limited as long as it can ensure the insulation required for the power storage element 100. However, as an insulating film, insulating resin such as PC, PP, PE, PPS, PET, PBT or ABS resin, epoxy resin, Kapton (registered trademark), Teflon (registered trademark), silicone, polyisoprene, and polychloride can be used. Vinyl etc. are exemplified.
　容器１１０は、開口が形成された容器本体１２０と、容器本体１２０の当該開口を閉塞する蓋部１３０と、を有する直方体形状（角形または箱形）のケースである。容器本体１２０は、容器１１０の本体部を構成する矩形筒状で底を備える部材であり、Ｚ軸プラス方向側に開口が形成されている。蓋部１３０は、容器１１０の蓋体を構成するＸ軸方向に長い矩形状の板状部材であり、容器本体１２０のＺ軸プラス方向に配置されている。容器１１０（蓋部１３０）には、容器１１０内方の圧力が過度に上昇した場合に当該圧力を開放するガス排出弁１３１、及び、容器１１０内方に電解液を注液するための注液部（図示せず）等が設けられている。容器１１０（容器本体１２０及び蓋部１３０）の材質は、特に限定されず、ステンレス鋼、アルミニウム、アルミニウム合金、鉄、メッキ鋼板など溶接可能（接合可能）な金属とできるが、樹脂を用いることもできる。 The container 110 is a rectangular parallelepiped-shaped (prismatic or box-shaped) case that includes a container body 120 with an opening formed therein and a lid portion 130 that closes the opening of the container body 120. The container body 120 is a rectangular cylindrical member having a bottom and forming the main body portion of the container 110, and has an opening formed in the positive direction of the Z-axis. The lid portion 130 is a rectangular plate-like member that is long in the X-axis direction and constitutes the lid of the container 110, and is arranged in the positive Z-axis direction of the container body 120. The container 110 (lid 130) includes a gas discharge valve 131 that releases the pressure when the pressure inside the container 110 increases excessively, and a liquid injection valve for injecting electrolyte into the inside of the container 110. (not shown), etc. are provided. The material of the container 110 (container body 120 and lid part 130) is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate, but resin may also be used. can.
　容器１１０は、電極体等を容器本体１２０の内方に収容後、容器本体１２０と蓋部１３０とが溶接等によって接合されることにより、内部が密封される構造となっている。容器１１０は、Ｙ軸方向両側の側面に一対の長側面１１１を有し、Ｘ軸方向両側の側面に一対の短側面１１２を有し、Ｚ軸マイナス方向側に底面１１３を有している。長側面１１１は、容器１１０の長側面を形成するＸＺ平面に平行な矩形状の平面部であり、隣り合うスペーサ２００とＹ軸方向において対向して配置される。長側面１１１は、短側面１１２及び底面１１３に隣接し、短側面１１２よりも面積が大きい。短側面１１２は、容器１１０の短側面を形成するＹＺ平面に平行な矩形状の平面部である。短側面１１２は、長側面１１１及び底面１１３に隣接し、長側面１１１よりも面積が小さい。底面１１３は、容器１１０の底面を形成するＸＹ平面に平行な矩形状の平面部であり、長側面１１１及び短側面１１２に隣接して配置される。長側面１１１は蓄電素子１００の長側面でもある。短側面１１２は蓄電素子１００の短側面でもある。 The container 110 has a structure in which the inside is sealed by accommodating the electrode body and the like inside the container body 120, and then joining the container body 120 and the lid portion 130 by welding or the like. The container 110 has a pair of long sides 111 on both sides in the Y-axis direction, a pair of short sides 112 on both sides in the X-axis direction, and a bottom surface 113 on the negative side in the Z-axis direction. The long side surface 111 is a rectangular flat portion parallel to the XZ plane that forms the long side surface of the container 110, and is disposed to face the adjacent spacer 200 in the Y-axis direction. The long side 111 is adjacent to the short side 112 and the bottom 113 and has a larger area than the short side 112. The short side surface 112 is a rectangular flat portion parallel to the YZ plane that forms the short side surface of the container 110. The short side surface 112 is adjacent to the long side surface 111 and the bottom surface 113 and has a smaller area than the long side surface 111. The bottom surface 113 is a rectangular plane part parallel to the XY plane that forms the bottom surface of the container 110, and is disposed adjacent to the long side surface 111 and the short side surface 112. The long side surface 111 is also the long side surface of the power storage element 100. Short side 112 is also a short side of power storage element 100.
　電極端子１４０は、蓋部１３０に配置される蓄電素子１００の端子部材（正極端子及び負極端子）であり、集電体を介して、電極体の正極板及び負極板に電気的に接続されている。電極端子１４０は、電極体に蓄えられている電気を蓄電素子１００の外部空間に導出し、電極体に電気を蓄えるために蓄電素子１００の内部空間に電気を導入するための金属製の部材である。電極端子１４０は、アルミニウム、アルミニウム合金、銅、銅合金等で形成されている。 The electrode terminal 140 is a terminal member (a positive electrode terminal and a negative electrode terminal) of the electricity storage element 100 arranged in the lid part 130, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. There is. The electrode terminal 140 is a metal member that leads the electricity stored in the electrode body to the external space of the electricity storage element 100 and introduces electricity into the internal space of the electricity storage element 100 to store electricity in the electrode body. be. The electrode terminal 140 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
　電極体は、正極板と負極板とセパレータとが積層されて形成された蓄電要素（発電要素）である。正極板は、アルミニウムまたはアルミニウム合金等の金属からなる集電箔である正極基材層上に正極活物質層が形成されたものである。負極板は、銅または銅合金等の金属からなる集電箔である負極基材層上に負極活物質層が形成されたものである。正極活物質層及び負極活物質層に用いられる活物質としては、リチウムイオンを吸蔵放出可能なものであれば、適宜公知の材料を使用できる。セパレータは、樹脂からなる微多孔性のシートまたは不織布等を用いることができる。本実施の形態では、電極体は、極板（正極板及び負極板）がＹ軸方向に積層されて形成されている。電極体は、極板（正極板及び負極板）が巻回されて形成された巻回型の電極体、複数の平板状の極板が積層されて形成された積層型（スタック型）の電極体、または、極板を蛇腹状に折り畳んだ蛇腹型の電極体等、どのような形態の電極体でもよい。 The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction. The electrode body is a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating multiple flat electrode plates. The electrode body may be in any form, such as a bellows-shaped electrode body in which a body or an electrode plate is folded into a bellows shape.
　集電体は、電極端子１４０と電極体とに電気的に接続される導電性の部材（正極集電体及び負極集電体）である。正極集電体は、正極板の正極基材層と同様、アルミニウムまたはアルミニウム合金等で形成され、負極集電体は、負極板の負極基材層と同様、銅または銅合金等で形成されている。 The current collector is a conductive member (a positive electrode current collector and a negative electrode current collector) that is electrically connected to the electrode terminal 140 and the electrode body. The positive electrode current collector is formed of aluminum or an aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper, copper alloy, etc., like the negative electrode base material layer of the negative electrode plate. There is.
　［３　保持部材３１０の説明］
　次に、保持部材３１０の構成について、詳細に説明する。図４は、実施の形態に係る保持部材３１０の構成を示す斜視図及び断面図である。具体的には、図４の（ａ）は、図２に示した保持部材３１０を拡大して示す斜視図であり、図４の（ｂ）は、図４の（ａ）の一部をさらに拡大して示す斜視図である。図５は、実施の形態に係る保持部材３１０が有する壁部３１４の断面図である。具体的には、図５は、保持部材３１０が有する壁部３１４を、図４の（ｂ）に示したＶ－Ｖ線を含みＹＺ平面に平行な面で切断した場合の断面図である。図５は、壁部３１４の周囲に配置される蓄電素子１００及びスペーサ２１０も破線で示している。図６は、実施の形態に係る保持部材３１０に、蓄電素子１００及びスペーサ２１０を配置した場合の構成を示す上面図である。具体的には、図６は、図４に示した保持部材３１０の一部について、保持部材３１０に蓄電素子１００及びスペーサ２１０を配置した場合の構成を、Ｚ軸プラス方向から見た図である。 [3 Description of holding member 310]
Next, the configuration of the holding member 310 will be explained in detail. FIG. 4 is a perspective view and a cross-sectional view showing the configuration of the holding member 310 according to the embodiment. Specifically, FIG. 4(a) is an enlarged perspective view of the holding member 310 shown in FIG. 2, and FIG. 4(b) is an enlarged perspective view of a part of FIG. 4(a). It is an enlarged perspective view. FIG. 5 is a cross-sectional view of the wall portion 314 included in the holding member 310 according to the embodiment. Specifically, FIG. 5 is a cross-sectional view of the wall portion 314 of the holding member 310 taken along a plane parallel to the YZ plane including the line VV shown in FIG. 4(b). FIG. 5 also shows the power storage element 100 and spacer 210 arranged around the wall portion 314 with broken lines. FIG. 6 is a top view showing a configuration when the power storage element 100 and the spacer 210 are arranged in the holding member 310 according to the embodiment. Specifically, FIG. 6 is a diagram of the configuration of a part of the holding member 310 shown in FIG. 4 when the power storage element 100 and the spacer 210 are arranged on the holding member 310, as viewed from the Z-axis plus direction. .
　これらの図に示すように、保持部材３１０は、底壁３１１と、一対の側壁３１２及び一対の側壁３１３と、複数の壁部３１４と、を有した樹脂成形品である。 As shown in these figures, the holding member 310 is a resin molded product having a bottom wall 311, a pair of side walls 312, a pair of side walls 313, and a plurality of wall portions 314.
　底壁３１１は、複数の蓄電素子１００及び複数のスペーサ２１０のＺ軸マイナス方向に配置され、複数の蓄電素子１００及び複数のスペーサ２１０を下方から支持する部位である。底壁３１１は、ＸＹ平面に平行かつＹ軸方向に延びる平板状かつ矩形状に形成されている。つまり、底壁３１１は、Ｚ軸方向（第一方向及び第二方向に交差する第三方向）において蓄電素子１００と対向して配置される。具体的には、底壁３１１は、外装体の底面を形成する壁部である。底壁３１１は、蓄電素子１００の容器１１０の底面１１３とＺ軸方向において対向して配置されている。底壁３１１は、それぞれの蓄電素子１００の底面１１３と対向する位置に配置された台座部３１１ａを有している。台座部３１１ａは、底面１１３に向けて突出して当該底面１１３に接触する。 The bottom wall 311 is a part that is arranged in the negative Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 210 and supports the plurality of power storage elements 100 and the plurality of spacers 210 from below. The bottom wall 311 is formed into a flat rectangular shape that extends parallel to the XY plane and in the Y-axis direction. That is, the bottom wall 311 is arranged to face the power storage element 100 in the Z-axis direction (the third direction intersecting the first direction and the second direction). Specifically, the bottom wall 311 is a wall portion that forms the bottom surface of the exterior body. The bottom wall 311 is arranged to face the bottom surface 113 of the container 110 of the power storage element 100 in the Z-axis direction. The bottom wall 311 has a pedestal portion 311a disposed at a position facing the bottom surface 113 of each power storage element 100. The pedestal portion 311a protrudes toward the bottom surface 113 and comes into contact with the bottom surface 113.
　一対の側壁３１２は、底壁３１１のＸ軸方向両端部からＺ軸プラス方向に突出し、ＹＺ平面に平行かつＹ軸方向に延びる長尺な平板状の壁部である。一対の側壁３１２は、Ｘ軸方向（第二方向）において蓄電素子１００と対向して配置される。一対の側壁３１２のうちのＸ軸マイナス方向の側壁３１２は、蓄電素子１００の容器１１０のＸ軸マイナス方向の短側面１１２とＸ軸方向において対向して配置される。Ｘ軸プラス方向の側壁３１２は、蓄電素子１００の容器１１０のＸ軸プラス方向の短側面１１２とＸ軸方向において対向して配置される。具体的には、側壁３１２は、蓄電素子１００の短側面１１２に対向する対向面（第二対向面）３１２ｂを有している。このように、一対の側壁３１２は、Ｘ軸方向において蓄電素子１００を挟む位置に配置される。 The pair of side walls 312 are long flat wall portions that protrude from both ends of the bottom wall 311 in the X-axis direction in the Z-axis plus direction and extend parallel to the YZ plane and in the Y-axis direction. A pair of side walls 312 are arranged to face power storage element 100 in the X-axis direction (second direction). The side wall 312 in the negative X-axis direction of the pair of side walls 312 is arranged to face the short side 112 in the negative X-axis direction of the container 110 of the power storage element 100 in the X-axis direction. The side wall 312 in the X-axis positive direction is arranged to face the short side 112 in the X-axis positive direction of the container 110 of the power storage element 100 in the X-axis direction. Specifically, the side wall 312 has a facing surface (second facing surface) 312b facing the short side surface 112 of the power storage element 100. In this way, the pair of side walls 312 are arranged at positions sandwiching the power storage element 100 in the X-axis direction.
　一対の側壁３１３は、底壁３１１のＹ軸方向両端部からＺ軸プラス方向に突出し、ＸＺ平面に平行かつＸ軸方向に延びる平板状かつ矩形状の壁部であり、Ｙ軸方向において蓄電素子１００と対向して配置される。一対の側壁３１３のうちのＹ軸マイナス方向の側壁３１３は、複数の蓄電素子１００のうちのＹ軸マイナス方向端部に位置する蓄電素子１００の容器１１０のＹ軸マイナス方向の長側面１１１とＹ軸方向において対向して配置される。Ｙ軸プラス方向の側壁３１３は、Ｙ軸プラス方向端部に位置する蓄電素子１００の容器１１０のＹ軸プラス方向の長側面１１１とＹ軸方向において対向して配置される。このように、一対の側壁３１３は、Ｙ軸方向において複数の蓄電素子１００を挟む位置に配置される。 The pair of side walls 313 are plate-shaped and rectangular walls that protrude from both ends of the bottom wall 311 in the Y-axis direction in the Z-axis plus direction, and extend parallel to the XZ plane and in the X-axis direction. 100. The side wall 313 in the Y-axis negative direction of the pair of side walls 313 is connected to the long side 111 in the Y-axis negative direction of the container 110 of the power storage element 100 located at the end in the Y-axis negative direction among the plurality of power storage elements 100. They are arranged to face each other in the axial direction. The side wall 313 in the positive Y-axis direction is arranged to face the long side 111 in the positive Y-axis direction of the container 110 of the power storage element 100 located at the end in the positive Y-axis direction in the Y-axis direction. In this way, the pair of side walls 313 are arranged at positions sandwiching the plurality of power storage elements 100 in the Y-axis direction.
　壁部３１４は、Ｙ軸方向（第一方向）において蓄電素子１００と隣り合って配置され、側壁３１２に向けて延び、かつ、底壁３１１と一体化された壁部である。壁部３１４は、Ｙ軸方向（第一方向）において２つの蓄電素子１００の間に配置される（図５参照）。具体的には、壁部３１４は、隣り合う２つの蓄電素子１００の間において、当該２つの蓄電素子１００の容器１１０の長側面１１１に対向して配置される。壁部３１４は、側壁３１２に向けてＸ軸方向（第二方向）に連続して延びる長尺な部位であり、底壁３１１からＺ軸プラス方向に突出して配置される。壁部３１４は、蓄電素子１００のＸ軸方向（第二方向）における一端から他端までの長さを含む範囲において連続して形成されている。壁部３１４は、蓄電素子１００の長側面１１１に向けて突出しないのであれば、溝が形成されていたり、Ｘ軸方向（第二方向）に不連続に形成されていてもよい。 The wall portion 314 is a wall portion that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction), extends toward the side wall 312, and is integrated with the bottom wall 311. Wall portion 314 is arranged between two power storage elements 100 in the Y-axis direction (first direction) (see FIG. 5). Specifically, the wall portion 314 is disposed between two adjacent power storage elements 100 so as to face the long side surface 111 of the container 110 of the two power storage elements 100 . The wall portion 314 is a long portion that continuously extends in the X-axis direction (second direction) toward the side wall 312, and is arranged to protrude from the bottom wall 311 in the Z-axis plus direction. Wall portion 314 is continuously formed in a range including the length from one end to the other end of power storage element 100 in the X-axis direction (second direction). As long as the wall portion 314 does not protrude toward the long side surface 111 of the power storage element 100, a groove may be formed or the wall portion 314 may be formed discontinuously in the X-axis direction (second direction).
　本実施の形態では、壁部３１４は、底壁３１１からＺ軸プラス方向に膨出状に突出する突出部である。つまり、壁部３１４のＺ軸マイナス方向の面には、Ｚ軸プラス方向に向けて凹んだ凹部である壁部凹部３１４ｂが形成されている。壁部３１４のＺ軸プラス方向の面の壁部凹部３１４ｂと対向する位置には、Ｚ軸マイナス方向に向けて凹んだ凹部である壁部凹部３１４ａが形成されている。壁部凹部３１４ａ及び３１４ｂは、壁部３１４のＸ軸方向の一端部から他端部までに亘ってＸ軸方向に延びる凹部である（図５等参照）。壁部３１４は、全体に壁部凹部３１４ａ及び３１４ｂが形成されることで、底壁３１１よりも厚みが厚くなり過ぎることなく、底壁３１１と厚みが同等の部位となっている。このように、壁部３１４は、底壁３１１と連続した部位であり、底壁３１１と一体的に形成（一体化）されている。 In the present embodiment, the wall portion 314 is a protruding portion that protrudes from the bottom wall 311 in a bulging shape in the positive direction of the Z-axis. That is, a wall recess 314b, which is a recess recessed toward the Z-axis positive direction, is formed on the surface of the wall 314 in the Z-axis negative direction. A wall recess 314a, which is a recess recessed toward the Z-axis minus direction, is formed at a position facing the wall recess 314b on the surface of the wall 314 in the Z-axis plus direction. The wall recesses 314a and 314b are recesses that extend in the X-axis direction from one end of the wall 314 in the X-axis direction to the other end (see FIG. 5, etc.). The wall portion 314 is formed with wall recesses 314a and 314b throughout, so that the wall portion 314 does not become too thick than the bottom wall 311 and has the same thickness as the bottom wall 311. In this way, the wall portion 314 is a continuous portion of the bottom wall 311, and is integrally formed (integrated) with the bottom wall 311.
　壁部３１４は、スペーサ２１０のＺ軸マイナス方向に配置され、Ｚ軸方向（第三方向）においてスペーサ２１０を支持する台座である（図５参照）。つまり、壁部３１４は、Ｙ軸方向（第一方向）において蓄電素子１００と隣り合って配置されるスペーサ２１０を支持する。壁部３１４のＺ軸プラス方向の面のＹ軸方向中央部に、スペーサ２１０のＺ軸マイナス方向の面が接触した状態で、壁部３１４上にスペーサ２１０が載せられる。本実施の形態では、全てのスペーサ２１０に対応して、複数の壁部３１４がＹ軸方向に並んで配置され、それぞれの壁部３１４がそれぞれのスペーサ２１０をＺ軸マイナス方向から支持する。図６に示すように、壁部３１４は、Ｙ軸方向においてはスペーサ２１０よりも厚みが厚く、Ｘ軸方向においてはスペーサ２１０よりも長さが短い。具体的には、壁部３１４は、蓄電素子１００におけるＸ軸方向の少なくとも中央部に対向して配置されている。壁部３１４のＸ軸方向の長さは、蓄電素子１００のＸ軸方向の長さの１／３以上であると好ましい。蓄電素子１００におけるＸ軸方向の中央部とは、蓄電素子１００のＸ軸方向の中心位置を含む部位であり、中心を含み蓄電素子１００のＸ軸方向の長さの約１／３の長さの範囲である。 The wall portion 314 is a pedestal that is arranged in the negative Z-axis direction of the spacer 210 and supports the spacer 210 in the Z-axis direction (third direction) (see FIG. 5). That is, the wall portion 314 supports the spacer 210 that is arranged adjacent to the power storage element 100 in the Y-axis direction (first direction). The spacer 210 is placed on the wall portion 314 with the surface of the spacer 210 in the negative Z-axis direction being in contact with the center portion in the Y-axis direction of the surface of the wall portion 314 in the positive Z-axis direction. In this embodiment, a plurality of wall portions 314 are arranged in line in the Y-axis direction corresponding to all the spacers 210, and each wall portion 314 supports each spacer 210 from the negative Z-axis direction. As shown in FIG. 6, the wall portion 314 is thicker than the spacer 210 in the Y-axis direction and shorter than the spacer 210 in the X-axis direction. Specifically, wall portion 314 is arranged to face at least the center portion of power storage element 100 in the X-axis direction. The length of wall portion 314 in the X-axis direction is preferably ⅓ or more of the length of power storage element 100 in the X-axis direction. The central portion of the power storage element 100 in the X-axis direction is a region that includes the center position of the power storage element 100 in the X-axis direction, and has a length that includes the center and is approximately 1/3 of the length of the power storage element 100 in the X-axis direction. is within the range of
　壁部凹部３１４ａは、壁部凹部３１４ａ内にスペーサ２１０の端部が入らないように、Ｙ軸方向においてはスペーサ２１０よりも幅が小さく、Ｘ軸方向においてはスペーサ２１０よりも長さが短く形成されている。 The wall recess 314a is formed to have a width smaller than the spacer 210 in the Y-axis direction and a length shorter than the spacer 210 in the X-axis direction so that the end of the spacer 210 does not enter the wall recess 314a. has been done.
　壁部３１４は、底壁３１１を平面視（Ｚ軸方向視）した場合に、蓄電素子１００とＹ軸方向で隣り合う位置に配置された第一壁部の一例である。側壁３１２及び３１３は、壁部３１４とは異なる位置で配置された第二壁部の一例である。 The wall portion 314 is an example of a first wall portion disposed at a position adjacent to the power storage element 100 in the Y-axis direction when the bottom wall 311 is viewed from above (viewed in the Z-axis direction). The side walls 312 and 313 are examples of second wall parts arranged at different positions from the wall part 314.
　図７は、実施の形態に係る第二壁部を示す断面図である。図７では、第二壁部として側壁３１２を例示している。図７に示すように、第二壁部である側壁３１２では、外側の面である外面３１２ａ及び内側の面である内面３１２ｂのそれぞれがＺ軸方向（第三方向）に対して勾配αで傾いている。内面３１２ｂは、蓄電素子１００の短側面１１２に対向する対向面（第二対向面）である。勾配αは、第二対向面３１２ｂとＺ軸方向とがなす鋭角側の角度である。外面３１２ａとＺ軸方向とがなす鋭角側の角度もαとなっている。この勾配αは、樹脂成形品の金型からの抜き勾配であり、０．５度以上２度未満の値となっている。側壁３１３の外面および内面も、側壁３１２と同様に勾配αの抜き勾配を有している。 FIG. 7 is a sectional view showing the second wall portion according to the embodiment. In FIG. 7, a side wall 312 is illustrated as the second wall portion. As shown in FIG. 7, in the side wall 312 that is the second wall portion, an outer surface 312a that is an outer surface and an inner surface 312b that is an inner surface are each inclined at a gradient α with respect to the Z-axis direction (third direction). ing. The inner surface 312b is a facing surface (second facing surface) facing the short side surface 112 of the power storage element 100. The gradient α is an acute angle between the second opposing surface 312b and the Z-axis direction. The acute angle between the outer surface 312a and the Z-axis direction is also α. This slope α is the draft angle of the resin molded product from the mold, and has a value of 0.5 degrees or more and less than 2 degrees. The outer and inner surfaces of the side wall 313 also have a draft angle of the slope α, similar to the side wall 312.
　一方、図５に示すように、第一壁部である壁部３１４は、Ｚ軸プラス方向に向けて先細る外形を有している。壁部３１４においてＺ軸方向（第三方向）の長さＨ１は、蓄電素子１００におけるＺ軸方向の長さの１／８以内である。好ましくは、長さＨ１は、蓄電素子１００の容器１１０におけるＺ軸方向の長さの１／８以内であればよい。本実施の形態では、長さＨ１は、壁部３１４の上端から台座部３１１ａまでのＺ軸方向の長さとしているが、壁部３１４の上端から下端までのＺ軸方向の長さを長さＨ１としてもよい。 On the other hand, as shown in FIG. 5, the wall portion 314, which is the first wall portion, has an outer shape that tapers in the positive direction of the Z-axis. The length H1 of the wall portion 314 in the Z-axis direction (third direction) is within 1/8 of the length of the power storage element 100 in the Z-axis direction. Preferably, the length H1 should be within ⅛ of the length of the power storage element 100 in the Z-axis direction in the container 110. In this embodiment, the length H1 is the length in the Z-axis direction from the top end of the wall portion 314 to the pedestal portion 311a, but the length H1 is the length in the Z-axis direction from the top end to the bottom end of the wall portion 314. It may also be H1.
　壁部３１４には、Ｙ軸方向において蓄電素子１００の長側面１１１に対向する対向面３１５が設けられている。壁部３１４の対向面３１５は、側壁３１２の内面である対向面３１２ｂ（第二対向面）と区別するために、第一対向面とも呼ぶ。対向面３１５（第一対向面）は、壁部３１４のＹ軸方向の両側に一対形成されている。各対向面３１５はＺ軸方向に対して傾いている。一対の対向面３１５は、互いにＹ軸方向で相反する向きを向いている点で異なるが、基本的な構成は同様である。 The wall portion 314 is provided with a facing surface 315 that faces the long side surface 111 of the power storage element 100 in the Y-axis direction. The opposing surface 315 of the wall portion 314 is also referred to as a first opposing surface to distinguish it from the opposing surface 312b (second opposing surface) that is the inner surface of the side wall 312. A pair of opposing surfaces 315 (first opposing surfaces) are formed on both sides of the wall portion 314 in the Y-axis direction. Each opposing surface 315 is inclined with respect to the Z-axis direction. The pair of opposing surfaces 315 differ in that they face opposite directions in the Y-axis direction, but have the same basic configuration.
　各対向面（第一対向面）３１５は、Ｚ軸方向（第三方向）において、壁部３１４の下方に設けられ、底壁３１１に近い位置に形成された平面状の第一面３１５ａと、第一面３１５ａよりも底壁３１１から遠い位置に設けられた平面状の第二面３１５ｂとを有している。対向面（第一対向面）３１５は、Ｘ軸方向（第二方向）に延びる連続した平面である。第一面３１５ａおよび第二面３１５ｂとは、Ｘ軸方向（第二方向）に延びる連続した平面である。対向面３１５（第一面３１５ａと第二面３１５ｂ）は、平面の法線方向に突出する形状がなければ、不連続であってもよい。不連続な形状の一例としては溝を例示できる。第一面３１５ａと第二面３１５ｂとはＺ軸方向で連続して設けられている。 Each opposing surface (first opposing surface) 315 is provided below the wall portion 314 in the Z-axis direction (third direction), and includes a planar first surface 315a formed at a position close to the bottom wall 311; It has a planar second surface 315b provided at a position farther from the bottom wall 311 than the first surface 315a. The opposing surface (first opposing surface) 315 is a continuous plane extending in the X-axis direction (second direction). The first surface 315a and the second surface 315b are continuous planes extending in the X-axis direction (second direction). The opposing surfaces 315 (first surface 315a and second surface 315b) may be discontinuous as long as they do not have a shape that protrudes in the normal direction of the plane. An example of a discontinuous shape is a groove. The first surface 315a and the second surface 315b are provided continuously in the Z-axis direction.
　第一面３１５ａはＺ軸方向に対して勾配βで傾いており、第二面３１５ｂはＺ軸方向に対して勾配γで傾いている。勾配とは、蓄電装置１を構成する部材の表面（第一面３１５ａ、第二面３１５ｂなど）が第三方向（Ｚ軸方向）に対してなす鋭角側の角度である。第三方向とは、第一方向（Ｙ軸方向）および第二方向（Ｘ軸方向）に交差する方向である。第三方向とは、底壁３１１と蓄電素子１００が並ぶ方向である。第三方向とは、蓄電素子１００と壁部３１４とが対向する方向（第一方向）、および、壁部３１４が延びる方向（第二方向）に交差する方向でもある。各勾配α、β、γの関係性は、α＜β＜γとなっている。つまり、対向面３１５の勾配は、全体として側壁３１２（第二壁部）の勾配αよりも大きい。具体的には、第一対向面３１５の勾配は、第二対向面３１２ｂの勾配よりも大きい。勾配βは２度以上、５度以下であればよく、勾配γは５度よりも大きければよい。勾配β、γは、３０度以下であり、２０度以下が好ましい。 The first surface 315a is inclined with a gradient β with respect to the Z-axis direction, and the second surface 315b is inclined with a gradient γ with respect to the Z-axis direction. The slope is an acute angle that the surfaces (first surface 315a, second surface 315b, etc.) of the members constituting power storage device 1 make with respect to the third direction (Z-axis direction). The third direction is a direction that intersects the first direction (Y-axis direction) and the second direction (X-axis direction). The third direction is a direction in which bottom wall 311 and power storage element 100 are lined up. The third direction is also a direction that intersects the direction in which power storage element 100 and wall portion 314 face each other (first direction) and the direction in which wall portion 314 extends (second direction). The relationship between the gradients α, β, and γ is α<β<γ. That is, the slope of the opposing surface 315 is larger than the slope α of the side wall 312 (second wall portion) as a whole. Specifically, the slope of the first opposing surface 315 is greater than the slope of the second opposing surface 312b. The slope β may be 2 degrees or more and 5 degrees or less, and the slope γ may be larger than 5 degrees. The slopes β and γ are 30 degrees or less, preferably 20 degrees or less.
　上記勾配β、γの関係性より、本実施の形態では、第二面３１５ｂの勾配は、第一面３１５ａの勾配よりも大きい。 According to the relationship between the gradients β and γ, in this embodiment, the gradient of the second surface 315b is larger than the gradient of the first surface 315a.
　図６に示すように、保持部材３１０には突起３１６が形成されている。突起３１６は、Ｘ軸方向において、側壁３１２と壁部３１４との間に配置され、底壁３１１からＺ軸方向（第三方向）に突出する突起である。突起３１６のＺ軸方向の高さは、壁部３１４のＺ軸方の高さよりも低い。突起３１６は、底壁３１１と連続した部位であり、底壁３１１と一体的に形成されている。図４、図５、図８では突起３１６の図示を省略している。 As shown in FIG. 6, a protrusion 316 is formed on the holding member 310. The protrusion 316 is a protrusion that is arranged between the side wall 312 and the wall portion 314 in the X-axis direction and protrudes from the bottom wall 311 in the Z-axis direction (third direction). The height of the protrusion 316 in the Z-axis direction is lower than the height of the wall portion 314 in the Z-axis direction. The protrusion 316 is a continuous portion of the bottom wall 311 and is formed integrally with the bottom wall 311 . In FIGS. 4, 5, and 8, illustration of the protrusion 316 is omitted.
　本実施の形態では、突起３１６は、蓄電素子１００の位置決め用の突起である。図６に示すように、突起３１６は、それぞれの蓄電素子１００の容器１１０の底部において、Ｘ軸方向両端部をＹ軸方向で挟むように、Ｘ軸方向両端部のＹ軸方向両側に配置される。１つの蓄電素子１００に対して、４つの突起３１６が配置される。蓄電素子１００は壁部３１４に接触していないが、この４つの突起３１６が、蓄電素子１００の容器１１０とＹ軸方向で接触し、蓄電素子１００のＹ軸方向への移動を制限する。 In this embodiment, the protrusion 316 is a protrusion for positioning the power storage element 100. As shown in FIG. 6, the protrusions 316 are arranged at the bottom of the container 110 of each power storage element 100 on both sides in the Y-axis direction of both ends in the X-axis direction so as to sandwich both ends in the X-axis direction in the Y-axis direction. Ru. Four protrusions 316 are arranged for one power storage element 100. Although the power storage element 100 does not contact the wall portion 314, these four protrusions 316 contact the container 110 of the power storage element 100 in the Y-axis direction, thereby restricting movement of the power storage element 100 in the Y-axis direction.
　蓄電素子１００は、突起３１６で位置決めされるため、蓄電素子１００の長側面１１１と壁部３１４の対向面３１５とは接触していない。長側面１１１と対向面３１５との距離は２ｍｍ以下となっており、１ｍｍ以下が好ましい。この距離は、対向面（第一面３１５ａ）の底部（底壁３１１に接続する部位）と長側面１１１との距離である。 Since the power storage element 100 is positioned by the protrusion 316, the long side surface 111 of the power storage element 100 and the opposing surface 315 of the wall portion 314 are not in contact with each other. The distance between the long side surface 111 and the opposing surface 315 is 2 mm or less, preferably 1 mm or less. This distance is the distance between the bottom (part connected to the bottom wall 311) of the opposing surface (first surface 315a) and the long side surface 111.
　［４　蓄電素子１００と壁部３１４との状態遷移について］
　次に、蓄電素子１００と壁部３１４との状態遷移について説明する。図８は、実施の形態に係る蓄電素子１００と壁部３１４との状態遷移を示す説明図である。具体的には、図８の（ａ）は膨張前の蓄電素子１００と壁部３１４との状態を示し、図８の（ｂ）は膨張中の蓄電素子１００と壁部３１４との状態を示し、図８の（ｃ）は、図８の（ｂ）よりも膨張が進んだ蓄電素子１００と壁部３１４との状態を示している。いずれの状態においても、蓄電素子１００の容器１１０の各長側面１１１が、壁部３１４に対向している。 [4 Regarding state transition between power storage element 100 and wall portion 314]
Next, state transition between power storage element 100 and wall portion 314 will be described. FIG. 8 is an explanatory diagram showing state transitions between power storage element 100 and wall portion 314 according to the embodiment. Specifically, (a) of FIG. 8 shows the state of the power storage element 100 and the wall part 314 before expansion, and (b) of FIG. 8 shows the state of the power storage element 100 and the wall part 314 during expansion. , FIG. 8(c) shows a state in which the electricity storage element 100 and the wall portion 314 have expanded more than in FIG. 8(b). In either state, each long side surface 111 of the container 110 of the power storage element 100 faces the wall portion 314.
　図８の（ａ）に示すように、膨張前において、蓄電素子１００の一対の長側面１１１は、当該蓄電素子１００を挟む二つの壁部３１４の各対向面３１５に接していない。その後、蓄電素子１００が過剰に高温化すると蓄電素子１００内にガスが発生して、容器１１０の各長側面１１１が膨張する。これにより、図８の（ｂ）に示すように、容器１１０の各長側面１１１が各壁部３１４の第一面（対向面）３１５ａに接触する。 As shown in FIG. 8(a), before expansion, the pair of long sides 111 of the power storage element 100 are not in contact with the opposing surfaces 315 of the two walls 314 that sandwich the power storage element 100 therebetween. Thereafter, when power storage element 100 becomes excessively hot, gas is generated within power storage element 100, and each long side surface 111 of container 110 expands. As a result, each long side surface 111 of the container 110 comes into contact with the first surface (opposing surface) 315a of each wall portion 314, as shown in FIG. 8(b).
　蓄電素子１００の膨張が更に進行すると、各壁部３１４の第一面３１５ａの傾き（勾配β）によって容器１１０が上方へと押し出される。よって、図８の（ｃ）に示すように、蓄電素子１００は、底壁３１１から離れることになる。 As the expansion of power storage element 100 further progresses, container 110 is pushed upward due to the inclination (gradient β) of first surface 315a of each wall portion 314. Therefore, as shown in FIG. 8(c), power storage element 100 is separated from bottom wall 311.
　本実施の形態では、第一面３１５ａの上方に、第一面３１５ａよりも勾配が大きい第二面３１５ｂがあるために、第一面３１５ａと第二面３１５ｂの境界の角Ｃが、膨張した蓄電素子１００の上方への移動の起点となり得る。蓄電素子１００の膨張が更に進行すると、各壁部３１４の第二面３１５ｂの傾き（勾配γ）によって蓄電素子１００が更に上方へと押し出される。 In this embodiment, since there is a second surface 315b having a larger slope than the first surface 315a above the first surface 315a, the angle C at the boundary between the first surface 315a and the second surface 315b expands. This can serve as a starting point for upward movement of power storage element 100. As the expansion of power storage element 100 further progresses, power storage element 100 is further pushed upward due to the inclination (gradient γ) of second surface 315b of each wall portion 314.
　したがって、過剰に高温化した蓄電素子１００の熱が底壁３１１に伝達されにくくなる。勾配β、γは、勾配αよりも大きいので、膨張した容器１１０を上方へと押し出しやすいため、早期に容器１１０を底壁３１１から離すことが可能である。 Therefore, the heat of the power storage element 100 that has become excessively high in temperature is difficult to be transferred to the bottom wall 311. Since the slopes β and γ are larger than the slope α, it is easy to push the expanded container 110 upward, so that the container 110 can be separated from the bottom wall 311 at an early stage.
　［５　効果の説明］
　以上のように、本発明の実施の形態に係る蓄電装置１によれば、壁部３１４（第一壁部）の対向面３１５の勾配（第一面３１５ａの勾配β、第二面３１５ｂの勾配γのそれぞれ）が側壁３１２及び３１３（第二壁部）の勾配αよりも大きい。このため、過剰に高温化した蓄電素子１００が膨張して、対向面３１５に当たるとこの対向面３１５に沿って蓄電素子１００が上方に移動し、底壁３１１から離れる。対向面３１５（第一面３１５ａと第二面３１５ｂ）は、Ｘ軸方向（第二方向）に延びる連続した平面であるため、蓄電素子１００の上方への移動がスムーズとなる。蓄電素子１００の上方への移動が阻害されなければ、対向面３１５（第一面３１５ａと第二面３１５ｂ）は、Ｘ軸方向（第二方向）に延びる不連続な平面であってもよい。これにより、蓄電素子１００の熱が底壁３１１に伝達されにくくなるため、底壁３１１を経由して他の蓄電素子１００へと熱が伝播することを抑制できる。したがって、複数並べられた蓄電素子１００のうち、一つの蓄電素子１００から他の蓄電素子１００に対する熱影響を抑制できる。 [5 Explanation of effects]
As described above, according to the power storage device 1 according to the embodiment of the present invention, the slope of the opposing surface 315 of the wall 314 (first wall) (the slope β of the first surface 315a, the slope β of the second surface 315b) γ) is larger than the slope α of the side walls 312 and 313 (second wall portion). Therefore, when the excessively heated power storage element 100 expands and hits the facing surface 315, the power storage element 100 moves upward along the facing surface 315 and separates from the bottom wall 311. Since opposing surfaces 315 (first surface 315a and second surface 315b) are continuous planes extending in the X-axis direction (second direction), upward movement of power storage element 100 becomes smooth. As long as upward movement of power storage element 100 is not inhibited, opposing surface 315 (first surface 315a and second surface 315b) may be a discontinuous plane extending in the X-axis direction (second direction). This makes it difficult for the heat of the power storage element 100 to be transferred to the bottom wall 311, so that it is possible to suppress the heat from propagating to other power storage elements 100 via the bottom wall 311. Therefore, among the plurality of power storage elements 100 arranged in a row, the thermal influence from one power storage element 100 to other power storage elements 100 can be suppressed.
　勾配αを比較対象としなくとも、対向面３１５の勾配がＺ軸方向に対して２度以上であれば、同様の効果を得ることが可能である。 Even if the slope α is not used for comparison, it is possible to obtain the same effect as long as the slope of the opposing surface 315 is 2 degrees or more with respect to the Z-axis direction.
　蓄電素子１００が膨張する際には、蓄電素子１００の長側面１１１が弧状に膨らむ。このため、蓄電素子１００の周縁部よりも内側の領域では、蓄電素子１００の長側面１１１の法線方向における膨張時の変位量が大きい。本実施の形態では、第二面３１５ｂは、第一面３１５ａよりも底壁３１１から遠い位置に配置されている。このため、第一面３１５ａを蓄電素子１００の周縁部に対応させた位置に配置すると、第二面３１５ｂは、蓄電素子１００の周縁部よりも変位量が大きい部位に対応することとなり、蓄電素子１００の膨張を受け止めやすい。第二面３１５ｂの勾配γは、第一面３１５ａの勾配βよりも大きいので、膨張した蓄電素子１００を、底壁３１１から離れる方向にスムーズに移動できる。底壁３１１から離れる方向にスムーズに蓄電素子１００を移動できれば、それだけ早期に蓄電素子１００の熱が底壁３１１に伝達されにくくなる。したがって、底壁３１１を経由して他の蓄電素子１００へと熱が伝播することをより抑制でき、他の蓄電素子１００に対する熱影響をより抑制できる。 When the power storage element 100 expands, the long side 111 of the power storage element 100 expands in an arc shape. Therefore, in a region inside the peripheral edge of power storage element 100, the amount of displacement during expansion in the normal direction of long side surface 111 of power storage element 100 is large. In this embodiment, the second surface 315b is located farther from the bottom wall 311 than the first surface 315a. Therefore, when the first surface 315a is arranged at a position corresponding to the peripheral edge of the power storage element 100, the second surface 315b corresponds to a portion where the amount of displacement is larger than the peripheral edge of the power storage element 100, It is easy to accept the expansion of 100. Since the slope γ of the second surface 315b is larger than the slope β of the first surface 315a, the expanded power storage element 100 can be smoothly moved in the direction away from the bottom wall 311. The smoother the power storage element 100 can be moved in the direction away from the bottom wall 311, the sooner the heat of the power storage element 100 becomes less likely to be transferred to the bottom wall 311. Therefore, the propagation of heat to other power storage elements 100 via bottom wall 311 can be further suppressed, and the influence of heat on other power storage elements 100 can be further suppressed.
　上述したように、蓄電素子１００が膨張する際には、蓄電素子１００の長側面１１１が弧状に膨らむ。このとき、蓄電素子１００の長側面１１１の、Ｚ軸方向（第三方向）における周縁部の傾斜は、中央部の傾斜よりも大きくなる。長側面１１１の、Ｚ軸方向（第三方向）における傾斜とは、長側面１１１がＺ軸方向（第三方向）となす鋭角側の角度である。本実施の形態では、壁部３１４の長さＨ１が、蓄電素子１００におけるＺ軸方向の長さの１／８以内であるので、膨張した蓄電素子１００において傾斜の大きい周縁部に対応した位置に壁部３１４を配置できる。このため、壁部３１４の対向面３１５に対し、蓄電素子１００の傾斜の大きい周縁部を接触できる。これにより、膨張した蓄電素子１００を、底壁３１１から離れる方向にスムーズに移動できる。スムーズに蓄電素子１００を移動できれば、それだけ早期に蓄電素子１００の熱が底壁３１１に伝達されにくくなる。したがって、底壁３１１を経由して他の蓄電素子１００へと熱が伝播することをより抑制でき、他の蓄電素子１００に対する熱影響をより抑制できる。 As described above, when the power storage element 100 expands, the long side surface 111 of the power storage element 100 expands in an arc shape. At this time, the inclination of the peripheral portion of the long side surface 111 of the power storage element 100 in the Z-axis direction (third direction) is greater than the inclination of the central portion. The inclination of the long side surface 111 in the Z-axis direction (third direction) is the acute angle that the long side surface 111 makes with the Z-axis direction (third direction). In the present embodiment, since the length H1 of the wall portion 314 is within 1/8 of the length of the power storage element 100 in the Z-axis direction, the wall portion 314 is located at a position corresponding to the peripheral edge with a large inclination in the expanded power storage element 100. A wall 314 can be placed. Therefore, the peripheral edge portion of the power storage element 100 having a large slope can be brought into contact with the facing surface 315 of the wall portion 314 . Thereby, the expanded power storage element 100 can be smoothly moved in the direction away from the bottom wall 311. The smoother the power storage element 100 can be moved, the sooner the heat of the power storage element 100 will be less likely to be transferred to the bottom wall 311. Therefore, the propagation of heat to other power storage elements 100 via bottom wall 311 can be further suppressed, and the influence of heat on other power storage elements 100 can be further suppressed.
　壁部３１４が、蓄電素子１００におけるＸ軸方向（第二方向）の中央部に対向して配置されているので、Ｘ軸方向においても蓄電素子１００の膨張の大きい箇所に対向面３１５が配置される。これにより、膨張した蓄電素子１００を、対向面３１５によって底壁３１１から離れる方向にスムーズに移動できる。スムーズに蓄電素子１００を移動できれば、それだけ早期に蓄電素子１００の熱が底壁３１１に伝達されにくくなる。したがって、底壁３１１を経由して他の蓄電素子１００へと熱が伝播することをより抑制でき、他の蓄電素子１００に対する熱影響をより抑制できる。 Since the wall portion 314 is arranged to face the central part of the power storage element 100 in the X-axis direction (second direction), the opposing surface 315 is arranged at a location where the expansion of the power storage element 100 is large in the X-axis direction as well. Ru. Thereby, the expanded power storage element 100 can be smoothly moved in a direction away from the bottom wall 311 by the opposing surface 315. The smoother the power storage element 100 can be moved, the sooner the heat of the power storage element 100 will be less likely to be transferred to the bottom wall 311. Therefore, the propagation of heat to other power storage elements 100 via bottom wall 311 can be further suppressed, and the influence of heat on other power storage elements 100 can be further suppressed.
　壁部３１４のＸ軸方向の長さが、蓄電素子１００のＸ軸方向の長さの１／３以上であるので、膨張した蓄電素子１００を広範囲にわたって壁部３１４の対向面３１５に接触できる。このため、膨張した蓄電素子１００をスムーズに移動できる。 Since the length of the wall portion 314 in the X-axis direction is 1/3 or more of the length of the power storage element 100 in the X-axis direction, the expanded power storage element 100 can come into contact with the facing surface 315 of the wall portion 314 over a wide range. Therefore, the expanded power storage element 100 can be moved smoothly.
　複数の蓄電素子１００がバスバー４００で接続されて使用される際に、バスバー４００が曲げ部を備えるため、当該曲げ部が応力に追従できる。膨張した蓄電素子１００が保持部材３１０から離れる方向（Ｚ軸プラス方向）に移動した際には、当該蓄電素子１００に接続されたバスバーは正規の位置からずれようとする応力を受ける。バスバーの曲げ部が当該応力に柔軟に追従できるため、膨張した蓄電素子が保持部材からスムーズに移動できる。 When a plurality of power storage elements 100 are connected by bus bar 400 and used, since bus bar 400 includes a bent portion, the bent portion can follow stress. When the expanded power storage element 100 moves in the direction away from the holding member 310 (Z-axis positive direction), the bus bar connected to the power storage element 100 receives stress that tends to shift from its normal position. Since the bent portion of the bus bar can flexibly follow the stress, the expanded electricity storage element can be smoothly moved from the holding member.
　複数の蓄電素子１００は、保持部材３１０と第二支持体５２０（蓋体）とで挟まれている。蓄電素子１００が膨張して、保持部材３１０から離れる方向に移動すると、当該蓄電素子１００は第二支持体５２０（蓋体）に接近する。第二支持体５２０（蓋体）は金属製であるため、当該蓄電素子１００の熱を効果的に放熱できる。よって、蓄電素子が膨張した際に、他の蓄電素子に対する熱影響をより抑制できる。 The plurality of power storage elements 100 are sandwiched between the holding member 310 and the second support body 520 (lid body). When the power storage element 100 expands and moves away from the holding member 310, the power storage element 100 approaches the second support 520 (lid). Since the second support body 520 (lid body) is made of metal, it can effectively radiate the heat of the electricity storage element 100. Therefore, when a power storage element expands, thermal effects on other power storage elements can be further suppressed.
　［６　変形例の説明］
　以上、本実施の形態に係る蓄電装置１について説明したが、本発明は、上記実施の形態には限定されない。今回開示された実施の形態は、全ての点で例示であって制限的なものではなく、本発明の範囲には、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれる。 [6 Description of modification]
Although the power storage device 1 according to the present embodiment has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all changes within the meaning and scope equivalent to the scope of the claims. .
　上記実施の形態では、壁部３１４には、壁部凹部３１４ａ及び３１４ｂが形成されていることとしたが、壁部凹部３１４ａ及び３１４ｂのうちの少なくとも一方の凹部が形成されていなくてもよい。この変形例では、壁部には壁部凹部が形成されておらず、壁部が伝熱部材を含む形態について説明する。 In the embodiment described above, the wall recesses 314a and 314b are formed in the wall 314, but at least one of the wall recesses 314a and 314b may not be formed. In this modification, a configuration will be described in which a wall portion does not have a wall recessed portion and the wall portion includes a heat transfer member.
　図９は、変形例に係る壁部３１４Ｃを示す断面図である。図に示すように壁部３１４Ｃには、その内部に伝熱部材３５０が配置されている。伝熱部材３５０は、保持部材３１０よりも熱伝導率の高い、銅、アルミニウム、ニッケルなどの金属材料から形成されている。伝熱部材３５０は、伝熱壁３５１と、伝熱底３５２とを一体的に有している。伝熱壁３５１は、ＸＺ平面に平行かつＸ軸方向に延びる長尺な平板状の壁部であり、全体として壁部３１４Ｃ内に配置されている。これにより伝熱壁３５１は、壁部３１４Ｃの対向面３１５に対応する位置に配置されている。伝熱底３５２は、ＸＹ平面に平行な平板状の壁部であり、保持部材３１０の底壁３１１を下方から支えるように設けられている。 FIG. 9 is a cross-sectional view showing a wall portion 314C according to a modification. As shown in the figure, a heat transfer member 350 is disposed inside the wall portion 314C. The heat transfer member 350 is made of a metal material having higher thermal conductivity than the holding member 310, such as copper, aluminum, or nickel. The heat transfer member 350 integrally includes a heat transfer wall 351 and a heat transfer bottom 352. The heat transfer wall 351 is a long flat wall extending parallel to the XZ plane and in the X-axis direction, and is disposed as a whole within the wall 314C. Thereby, the heat transfer wall 351 is arranged at a position corresponding to the opposing surface 315 of the wall portion 314C. The heat transfer bottom 352 is a flat wall portion parallel to the XY plane, and is provided to support the bottom wall 311 of the holding member 310 from below.
　このように、壁部３１４Ｃには、伝熱部材３５０の伝熱壁３５１が対向面３１５に対応する位置に配置されているので、膨張した蓄電素子１００が壁部３１４Ｃの対向面３１５に接触すると、当該蓄電素子１００の熱が伝熱壁３５１に伝わり、伝熱底３５２から放熱される。これにより膨張および過熱した蓄電素子１００から、他の蓄電素子１００へと熱が伝播することを抑制でき、他の蓄電素子１００に対する熱影響をより抑制できる。 In this way, since the heat transfer wall 351 of the heat transfer member 350 is disposed on the wall portion 314C at a position corresponding to the opposing surface 315, when the expanded electricity storage element 100 comes into contact with the opposing surface 315 of the wall portion 314C, The heat of the electricity storage element 100 is transmitted to the heat transfer wall 351 and is radiated from the heat transfer bottom 352. Thereby, heat can be suppressed from propagating from expanded and overheated electricity storage element 100 to other electricity storage elements 100, and thermal effects on other electricity storage elements 100 can be further suppressed.
　（その他の変形例）
　（ａ）上記実施の形態では、壁部３１４の対向面３１５が、互いに勾配の異なる第一面３１５ａと第二面３１５ｂと有する場合を例示したが、対向面が全体として平坦な平面であってもよく、この場合、対向面の勾配が、第二壁部の内面３１２ｂの勾配よりも大きければよい。この場合、対向面の勾配は、２度以上であればよく、５度以上であれば好ましい。 (Other variations)
(a) In the above embodiment, the case where the opposing surface 315 of the wall portion 314 has the first surface 315a and the second surface 315b with mutually different slopes is illustrated, but the opposing surface is a flat plane as a whole. In this case, the slope of the opposing surface may be greater than the slope of the inner surface 312b of the second wall portion. In this case, the slope of the opposing surface may be at least 2 degrees, preferably at least 5 degrees.
　（ｂ）第二壁部３１２の内面３１２ｂを比較対象とせずに、第二面３１５ｂの勾配を第一面３１５ａの勾配よりも大きくするだけでもよい。同様な効果が得られる。この場合、第二面３１５ｂの勾配は、２度以上であればよく、５度以上であれば好ましい。第一面および第二面の勾配は、３０度以下であり、２０度以下が好ましい。 (b) The slope of the second surface 315b may be made larger than the slope of the first surface 315a without using the inner surface 312b of the second wall portion 312 as a comparison target. A similar effect can be obtained. In this case, the slope of the second surface 315b may be at least 2 degrees, preferably at least 5 degrees. The slopes of the first and second surfaces are 30 degrees or less, preferably 20 degrees or less.
　（ｃ）上記実施の形態では、保持部材３１０の突起３１６が、蓄電素子１００のＹ軸方向の移動を制限したが、保持部材３１０は、突起３１６を有していなくてもよい。膨張前の蓄電素子１００と壁部３１４が接触していなくても、蓄電素子１００が膨張した状態では、蓄電素子１００の一対の長側面１１１は、Ｙ軸方向の両側で対向する二つの壁部３１４の各対向面３１５に同じように接触する。 (c) In the above embodiment, the protrusion 316 of the holding member 310 restricts the movement of the power storage element 100 in the Y-axis direction, but the holding member 310 does not need to have the protrusion 316. Even if the electricity storage element 100 before expansion and the wall portion 314 are not in contact with each other, in the expanded state of the electricity storage element 100, the pair of long sides 111 of the electricity storage element 100 are connected to two opposing walls on both sides in the Y-axis direction. Each opposing surface 315 of 314 is contacted in the same manner.
　（ｄ）保持部材３１０は突起３１６を有さず、蓄電素子１００は、壁部３１４の対向面３１５の底部（底壁３１１に接続する部位）に接触していてもよい。壁部３１４が蓄電素子１００のＹ軸方向の位置決め部材としても機能する。この場合、蓄電素子１００が高温化して膨張すると、長側面１１１が対向面３１５（第一面３１５ａ、第二面３１５ｂ）接触するまでの時間が短くなり、より早く蓄電素子１００が上方に移動できる。 (d) The holding member 310 may not have the protrusion 316, and the power storage element 100 may be in contact with the bottom of the opposing surface 315 of the wall portion 314 (the portion connected to the bottom wall 311). Wall portion 314 also functions as a positioning member for power storage element 100 in the Y-axis direction. In this case, when the power storage element 100 becomes hot and expands, the time until the long side surface 111 contacts the opposing surface 315 (first surface 315a, second surface 315b) becomes shorter, and the power storage element 100 can move upward more quickly. .
（その他）
　上記実施の形態では、第一面３１５ａ及び第二面３１５ｂのそれぞれが平面である場合を例示した。第一面及び第二面の少なくとも一方が湾曲してもよい。湾曲している場合には、Ｘ軸方向視においてその起点と終点とを結ぶ仮想線とＺ軸方向とからなる鋭角が勾配となる。 (others)
In the embodiment described above, the first surface 315a and the second surface 315b are each flat. At least one of the first surface and the second surface may be curved. If it is curved, the slope is an acute angle formed by the Z-axis direction and the virtual line connecting the starting point and the ending point when viewed in the X-axis direction.
　上記実施の形態では、第一面３１５ａがＺ軸方向に対して傾いている場合を例示したが、第一面３１５ａがＺ軸方向に対して傾いていなくてもよい。 In the above embodiment, the case where the first surface 315a is tilted with respect to the Z-axis direction is illustrated, but the first surface 315a does not need to be tilted with respect to the Z-axis direction.
　上記実施の形態では、壁部３１４の長さＨ１が、蓄電素子１００におけるＺ軸方向の長さの１／８以内である場合を例示したが、第一壁部においてＺ軸方向の長さは、蓄電素子１００におけるＺ軸方向の長さの１／８よりも大きくてもよい。 In the above embodiment, the length H1 of the wall portion 314 is within 1/8 of the length of the power storage element 100 in the Z-axis direction, but the length of the first wall portion in the Z-axis direction is , may be larger than 1/8 of the length of the power storage element 100 in the Z-axis direction.
　上記実施の形態では、壁部３１４のＸ軸方向の長さが、蓄電素子１００のＸ軸方向の長さの１／３以上である場合を例示したが、壁部３１４のＸ軸方向の長さは、蓄電素子１００のＸ軸方向の長さの１／３未満であってもよい。 In the above embodiment, the length of the wall portion 314 in the X-axis direction is 1/3 or more of the length of the power storage element 100 in the X-axis direction, but the length of the wall portion 314 in the X-axis direction is The length may be less than ⅓ of the length of power storage element 100 in the X-axis direction.
　上記実施の形態では、保持部材３１０において、壁部３１４は、底壁３１１と連続した部位であることで、底壁３１１と一体化されていることとしたが、これには限定されない。壁部３１４は、底壁３１１と別体の壁部３１４が、接着剤等による接着、熱溶着等による溶着、または、レーザ溶接等による溶接等で、底壁３１１に接合されることで、底壁３１１と一体化されていてもよい。 In the embodiment described above, in the holding member 310, the wall portion 314 is a continuous portion of the bottom wall 311, so that the wall portion 314 is integrated with the bottom wall 311, but the present invention is not limited thereto. The wall portion 314 is formed by joining the bottom wall 311 and a separate wall portion 314 to the bottom wall 311 by bonding with an adhesive, heat welding, laser welding, etc. It may be integrated with the wall 311.
　上記実施の形態では、壁部３１４は、２つの蓄電素子１００の間に配置されることとしたが、２つの蓄電素子１００の間ではなく、端部の蓄電素子１００の側方（外側）に配置されてもよい。 In the embodiment described above, the wall portion 314 is arranged between the two power storage elements 100, but not between the two power storage elements 100 but on the side (outside) of the power storage element 100 at the end. may be placed.
　上記実施の形態では、壁部３１４は、Ｚ軸方向においてスペーサ２１０を支持することとしたが、壁部３１４のＹ軸方向にスペーサ２１０が配置されて、壁部３１４が、Ｙ軸方向においてスペーサ２１０を支持してもよい。壁部３１４の周囲にはスペーサ２１０が配置されず、壁部３１４がスペーサ２１０を支持しない構成でもよい。 In the above embodiment, the wall 314 supports the spacer 210 in the Z-axis direction, but the spacer 210 is arranged in the Y-axis direction of the wall 314, and the wall 314 supports the spacer 210 in the Y-axis direction. 210 may be supported. The spacer 210 may not be arranged around the wall portion 314, and the wall portion 314 may not support the spacer 210.
　壁部３１４のＹＺ平面での断面形状は、半円形状、半楕円形状、半長円形状、三角形状、その他の多角形状等、どのような形状でもよい。 The cross-sectional shape of the wall portion 314 in the YZ plane may be any shape, such as a semicircle, a semiellipse, a semiellipse, a triangle, or another polygon.
　上記実施の形態では、スペーサ２００は絶縁性および断熱性を有するグラスウールとしたが、スペーサは絶縁性を有するだけでもよい。 In the above embodiment, the spacer 200 is made of glass wool that has insulation and heat insulation properties, but the spacer may just have insulation properties.
　上記実施の形態では、外装体３００（保持部材３１０及び蓋部材３２０）は、複数の蓄電素子１００及び複数のスペーサ２００をＺ軸方向で挟むトレイ及びバスバーフレームであることとしたが、これには限定されない。蓋部材３２０は、バスバーフレームではなく、基板、リレー、ヒューズ、サーミスタまたはハーネス等の電気機器（電気部品）を配置する絶縁部材等でもよい。外装体３００は、複数の蓄電素子１００等を挟む構成ではなく、複数の蓄電素子１００等を収容するハウジングとしての保持部材３１０と、ハウジングの開口を塞ぐ蓋体としての蓋部材３２０とを有する箱形の容器（モジュールケース）であってもよい。 In the above embodiment, the exterior body 300 (the holding member 310 and the lid member 320) is a tray and a busbar frame that sandwich the plurality of power storage elements 100 and the plurality of spacers 200 in the Z-axis direction. Not limited. The lid member 320 may be an insulating member or the like on which electrical equipment (electrical components) such as a board, relay, fuse, thermistor, or harness is placed, instead of a busbar frame. The exterior body 300 is not configured to sandwich a plurality of power storage elements 100, etc., but is a box having a holding member 310 as a housing that accommodates a plurality of power storage elements 100, etc., and a lid member 320 as a lid body that closes an opening of the housing. It may also be a shaped container (module case).
　上記実施の形態では、蓄電素子１００は、電極端子１４０がＺ軸プラス方向に向く姿勢で配置されることとしたが、電極端子１４０がＸ軸方向、Ｙ軸方向またはＺ軸マイナス方向に向く姿勢で配置されてもよい。 In the embodiment described above, the power storage element 100 is arranged with the electrode terminal 140 facing in the Z-axis positive direction, but it is arranged in an orientation with the electrode terminal 140 facing in the X-axis direction, the Y-axis direction, or the Z-axis negative direction. It may be placed in
　上記実施の形態及びその変形例に含まれる構成要素を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。 Embodiments constructed by arbitrarily combining the components included in the above embodiments and their modifications are also included within the scope of the present invention.
　本発明は、リチウムイオン二次電池等の蓄電素子を備えた蓄電装置等に適用できる。 The present invention can be applied to a power storage device, etc. equipped with a power storage element such as a lithium ion secondary battery.
１　蓄電装置
１００　蓄電素子
１１０　容器
２００、２１０、２２０　スペーサ
３００　外装体
３１０　保持部材
３１１　底壁
３１１ａ　突出部
３１２、３１３　側壁（第二壁部）
３１２ａ　外面
３１２ｂ　内面（対向面、第二対向面）
３１４、３１４Ｃ　壁部（第一壁部）
３１４ａ、３１４ｂ　壁部凹部
３１５　対向面（第一対向面）
３１５ａ　第一面
３１５ｂ　第二面
３５０　伝熱部材
３５１　伝熱壁
３５２　伝熱底
Ｈ１　長さ
α、β、γ　勾配 1 Power storage device 100 Power storage element 110 Containers 200, 210, 220 Spacer 300 Exterior body 310 Holding member 311 Bottom wall 311a Projections 312, 313 Side wall (second wall)
312a Outer surface 312b Inner surface (opposing surface, second opposing surface)
314, 314C Wall part (first wall part)
314a, 314b Wall recess 315 Opposing surface (first opposing surface)
315a First surface 315b Second surface 350 Heat transfer member 351 Heat transfer wall 352 Heat transfer bottom H1 Length α, β, γ Gradient

Claims (8)

  1. 　蓄電素子と、
    　前記蓄電素子を保持する保持部材と、を備え、
    　前記保持部材は、
    　前記蓄電素子を支持する底壁と、
    　第一方向において前記蓄電素子に隣り合う位置に配置され、前記底壁から突出した第一壁部と、
    　前記第一壁部とは異なる位置に配置され、前記底壁から突出した第二壁部と、を備え、
    　前記第一壁部は、前記第一方向に交差する第二方向に延びており、
    　前記第一壁部において前記蓄電素子に対向する対向面の勾配は、前記第二壁部の勾配よりも大きい
    　蓄電装置。     A power storage element,
    A holding member that holds the electricity storage element,
    The holding member is
    a bottom wall that supports the electricity storage element;
    a first wall portion located adjacent to the power storage element in a first direction and protruding from the bottom wall;
    a second wall portion located at a different position from the first wall portion and protruding from the bottom wall;
    The first wall extends in a second direction intersecting the first direction,
    The slope of the opposing surface facing the power storage element in the first wall part is larger than the slope of the second wall part. The power storage device.
  2. 　前記対向面は、前記底壁に近い位置に設けられた第一面と、前記第一面よりも前記底壁から遠い位置に設けられた第二面とを備え、
    　前記第二面の勾配は、前記第一面の勾配よりも大きい
    　請求項１に記載の蓄電装置。     The opposing surface includes a first surface provided at a position close to the bottom wall, and a second surface provided at a position farther from the bottom wall than the first surface,
    The power storage device according to claim 1 , wherein the slope of the second surface is greater than the slope of the first surface.
  3. 　蓄電素子と、
    　前記蓄電素子を保持する保持部材と、を備え、
    　前記保持部材は、
    　前記蓄電素子を支持する底壁と、
    　第一方向において前記蓄電素子に隣り合う位置に配置され、前記底壁から突出した第一壁部と、を備え、
    　前記第一壁部は、前記蓄電素子に対向する対向面を備え、
    　前記第一壁部は、前記第一方向に交差する第二方向に延びており、
    　前記対向面は、前記底壁に近い位置に設けられた第一面と、前記第一面よりも前記底壁から遠い位置に設けられた第二面とを備え、
    　前記第二面の勾配は、前記第一面の勾配よりも大きい
    　蓄電装置。     A power storage element,
    A holding member that holds the electricity storage element,
    The holding member is
    a bottom wall that supports the electricity storage element;
    a first wall portion disposed adjacent to the power storage element in a first direction and protruding from the bottom wall;
    The first wall portion includes a facing surface facing the power storage element,
    The first wall extends in a second direction intersecting the first direction,
    The opposing surface includes a first surface provided at a position close to the bottom wall, and a second surface provided at a position farther from the bottom wall than the first surface,
    The slope of the second surface is greater than the slope of the first surface. Power storage device.
  4. 　前記第一壁部において、前記第一方向及び前記第二方向に交差する第三方向の長さは、前記蓄電素子における前記第三方向の長さの１／８以内である
    　請求項１～３のいずれか一項に記載の蓄電装置。     The length of the first wall portion in a third direction intersecting the first direction and the second direction is within ⅛ of the length of the electricity storage element in the third direction. The power storage device according to any one of .
  5. 　前記第一壁部は、前記蓄電素子における前記第二方向の中央部に対向して配置されている
    　請求項１～３のいずれか一項に記載の蓄電装置。     The power storage device according to any one of claims 1 to 3, wherein the first wall portion is arranged to face a central portion of the power storage element in the second direction.
  6. 　複数の前記蓄電素子と、隣り合う前記蓄電素子同士を接続するバスバーとを備え、
    　前記バスバーは、前記バスバーの、隣り合う前記蓄電装置が並ぶ方向における中間部に曲げ部を備える
    　請求項１～３のいずれか一項に記載の蓄電装置。     comprising a plurality of the power storage elements and a bus bar connecting the adjacent power storage elements,
    The power storage device according to any one of claims 1 to 3, wherein the bus bar includes a bent portion at an intermediate portion of the bus bar in a direction in which the adjacent power storage devices are lined up.
  7. 　前記蓄電素子と前記保持部材とが並ぶ方向において、前記保持部材とで前記蓄電素子を挟む位置に配置される金属製の蓋体を備える
    　請求項１～３のいずれか一項に記載の蓄電装置。     The power storage device according to any one of claims 1 to 3, comprising a metal lid body disposed at a position where the power storage element is sandwiched between the power storage element and the holding member in a direction in which the power storage element and the holding member are lined up. .
  8. 　前記第一壁部は、前記保持部材よりも熱伝導率の高い伝熱部材を含む
    　請求項１～３のいずれか一項に記載の蓄電装置。     The power storage device according to any one of claims 1 to 3, wherein the first wall portion includes a heat transfer member having a higher thermal conductivity than the holding member.
PCT/JP2023/012866 2022-03-31 2023-03-29 Power storage device WO2023190713A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JP2015185463A (en) * 2014-03-25 2015-10-22 株式会社Ｇｓユアサ Power supply module
JP2015211013A (en) * 2014-04-30 2015-11-24 株式会社Ｇｓユアサ Power storage device
JP2018006058A (en) * 2016-06-29 2018-01-11 トヨタ自動車株式会社 Battery module
JP2019197661A (en) * 2018-05-09 2019-11-14 株式会社Ｇｓユアサ Power storage device
WO2020111042A1 (en) * 2018-11-29 2020-06-04 パナソニックＩｐマネジメント株式会社 Electric power storage module

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012067045A1 (en) * 2010-11-18 2012-05-24 三洋電機株式会社 Battery assembly, separator for battery assembly, and vehicle provided with same
JP2015185463A (en) * 2014-03-25 2015-10-22 株式会社Ｇｓユアサ Power supply module
JP2015211013A (en) * 2014-04-30 2015-11-24 株式会社Ｇｓユアサ Power storage device
JP2018006058A (en) * 2016-06-29 2018-01-11 トヨタ自動車株式会社 Battery module
JP2019197661A (en) * 2018-05-09 2019-11-14 株式会社Ｇｓユアサ Power storage device
WO2020111042A1 (en) * 2018-11-29 2020-06-04 パナソニックＩｐマネジメント株式会社 Electric power storage module

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