JP7133151B2 - Power storage element and power storage device - Google Patents

Power storage element and power storage device Download PDF

Info

Publication number
JP7133151B2
JP7133151B2 JP2018551645A JP2018551645A JP7133151B2 JP 7133151 B2 JP7133151 B2 JP 7133151B2 JP 2018551645 A JP2018551645 A JP 2018551645A JP 2018551645 A JP2018551645 A JP 2018551645A JP 7133151 B2 JP7133151 B2 JP 7133151B2
Authority
JP
Japan
Prior art keywords
case
adhesive layer
power storage
exterior sheet
electrode body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2018551645A
Other languages
Japanese (ja)
Other versions
JPWO2018092775A1 (en
Inventor
太郎 山福
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GS Yuasa International Ltd
Original Assignee
GS Yuasa International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GS Yuasa International Ltd filed Critical GS Yuasa International Ltd
Publication of JPWO2018092775A1 publication Critical patent/JPWO2018092775A1/en
Application granted granted Critical
Publication of JP7133151B2 publication Critical patent/JP7133151B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/48—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by the material
    • H01M50/486—Organic material
    • 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
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/64—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
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • 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
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/443—Particulate material

Description

関連出願の相互参照Cross-reference to related applications

本願は、日本国特願２０１６－２２２４７３号の優先権を主張し、日本国特願２０１６－２２２４７３号の内容は、引用によって本願明細書の記載に組み込まれる。 This application claims the priority of Japanese Patent Application No. 2016-222473, and the content of Japanese Patent Application No. 2016-222473 is incorporated into the description of the present specification by reference.

本発明は、ケースと、接着層を介して前記ケースの外周面に固定される外装シートと、を備える蓄電素子、及び前記蓄電素子を備える蓄電装置に関するものである。 TECHNICAL FIELD The present invention relates to an electric storage element including a case and an exterior sheet fixed to the outer peripheral surface of the case via an adhesive layer, and an electric storage device including the electric storage element.

従来から、金属缶ケースと、金属缶ケースを被覆する絶縁外装体と、を備える電池セルが知られている（特許文献１参照）。具体的に、前記電池セルは、金属缶ケースと、前記金属缶ケースの中央部を被覆する絶縁外装体と、を備える、二次電池セルである。
前記絶縁外装体は、前記金属ケースの表面部分を被覆するように設けられる。前記絶縁外装体は、複数の材料からなる多層構造により形成されてなる。具体的には、前記絶縁外装体は、熱放射層、熱伝導層、絶縁層、及び粘着層等を有する多層シートである。前記粘着層は、前記絶縁外装体の全面において、該絶縁外装体と前記金属缶ケースとを密着させて固定する役割を果たす。従って、前記絶縁外装体は、粘着層が前記電池セル側となる向きで該電池セルを被覆し、前記粘着層と前記金属缶ケースとを接触させる。BACKGROUND ART Conventionally, a battery cell including a metal can case and an insulating outer covering covering the metal can case is known (see Patent Document 1). Specifically, the battery cell is a secondary battery cell that includes a metal can case and an insulating outer covering that covers the central portion of the metal can case.
The insulating outer covering is provided so as to cover the surface portion of the metal case. The insulating sheath is formed of a multi-layered structure made of a plurality of materials. Specifically, the insulating sheath is a multi-layer sheet having a heat emitting layer, a heat conductive layer, an insulating layer, an adhesive layer, and the like. The adhesive layer serves to adhere and fix the insulating outer covering and the metal can case over the entire surface of the insulating outer covering. Therefore, the insulating outer covering covers the battery cell with the adhesive layer facing the battery cell side, and brings the adhesive layer and the metal can case into contact with each other.

尚、前記絶縁外装体は、前記金属缶ケースとの間に塗布された粘着剤により粘着性を有することを実現してもよい。その場合に、前記絶縁外装体は、前記粘着層の代わりに当該粘着剤を前記絶縁層と前記金属缶ケースとの間に塗布する必要がある。 It should be noted that the insulating outer package may have adhesiveness due to an adhesive applied between it and the metal can case. In that case, the insulating outer package needs to apply the adhesive between the insulating layer and the metal can case instead of the adhesive layer.

上述の電池セルにおいて、粘着層や粘着剤は、熱放射層や熱伝導層等の絶縁外装体を構成する他の層よりも熱伝導率が低い。このため、前記電池セルでは、前記絶縁外装体の全面において粘着層や粘着剤が配置されているため、内部の熱が外部に十分に放出されない場合がある。 In the battery cell described above, the adhesive layer and the adhesive have a lower thermal conductivity than other layers that constitute the insulating exterior body, such as the thermal radiation layer and the thermal conductive layer. For this reason, in the battery cell, since the adhesive layer and the adhesive are arranged on the entire surface of the insulating outer casing, internal heat may not be sufficiently released to the outside.

日本国特開２００９－２９５３８１号公報Japanese Patent Application Laid-Open No. 2009-295381

そこで、本実施形態は、外装シートが接着層によってケースの外面に配置されていても、内部の熱を外部に放出させ易い蓄電素子及び蓄電装置を提供することを目的とする。 Therefore, an object of the present embodiment is to provide a power storage element and a power storage device that can easily release internal heat to the outside even if an exterior sheet is arranged on the outer surface of the case by means of an adhesive layer.

本実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する、蓄電素子。The power storage device of this embodiment is
an electrode body;
a case that accommodates the electrode body;
an exterior sheet extending along the outer surface of the case;
and an adhesive layer that fixes the exterior sheet to the outer surface of the case,
The electric storage element, wherein the exterior sheet has a portion facing the outer surface of the case via the adhesive layer and a portion directly facing the outer surface of the case.

図１は、本実施形態に係る蓄電素子の斜視図である。FIG. 1 is a perspective view of a power storage device according to this embodiment. 図２は、前記蓄電素子の分解斜視図である。FIG. 2 is an exploded perspective view of the storage element. 図３は、図１のＩＩＩ－ＩＩＩ位置における断面図である。FIG. 3 is a cross-sectional view taken along line III-III in FIG. 図４は、前記蓄電素子の電極体の斜視図である。FIG. 4 is a perspective view of an electrode body of the storage element. 図５は、図１のＶ－Ｖ位置における断面の模式図である。FIG. 5 is a schematic cross-sectional view taken along the line VV in FIG. 図６は、前記蓄電素子を含む蓄電装置の斜視図である。FIG. 6 is a perspective view of a power storage device including the power storage element. 図７は、前記蓄電装置の分解斜視図である。FIG. 7 is an exploded perspective view of the power storage device. 図８は、他実施形態に係る蓄電素子の断面の模式図である。FIG. 8 is a schematic cross-sectional view of a power storage device according to another embodiment. 図９は、他実施形態に係る蓄電素子のケース本体を外した状態における分解斜視図である。FIG. 9 is an exploded perspective view of a power storage device according to another embodiment with the case body removed. 図１０は、前記蓄電素子の斜視図である。FIG. 10 is a perspective view of the storage element. 図１１は、他実施形態に係る蓄電素子のケース本体を外した状態における分解斜視図である。FIG. 11 is an exploded perspective view of a power storage device according to another embodiment with the case main body removed. 図１２は、前記蓄電素子の斜視図である。FIG. 12 is a perspective view of the electric storage element. 図１３は、他実施形態に係る蓄電素子のケース本体を外した状態における分解斜視図である。FIG. 13 is an exploded perspective view of a power storage device according to another embodiment with the case main body removed. 図１４は、前記蓄電素子の斜視図である。FIG. 14 is a perspective view of the electric storage element. 図１５は、他実施形態に係る蓄電装置の分解斜視図である。FIG. 15 is an exploded perspective view of a power storage device according to another embodiment. 図１６は、前記蓄電装置が備える蓄電素子の外装シートを説明するための斜視図である。FIG. 16 is a perspective view for explaining an exterior sheet of a power storage element included in the power storage device. 図１７は、前記蓄電装置の冷却部材の位置を示す模式図である。FIG. 17 is a schematic diagram showing the position of the cooling member of the power storage device. 図１８は、他実施形態に係る蓄電装置の冷却部材の位置を示す模式図である。FIG. 18 is a schematic diagram showing positions of cooling members of a power storage device according to another embodiment.

本実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がる外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する。The power storage device of this embodiment is
an electrode body;
a case that accommodates the electrode body;
an exterior sheet extending along the outer surface of the case;
and an adhesive layer that fixes the exterior sheet to the outer surface of the case,
The exterior sheet has a portion that faces the outer surface of the case via the adhesive layer, and a portion that directly faces the outer surface of the case.

かかる構成によれば、接着層が外装シートの全面に配置されていないことで、ケース内部の熱が接着層を介さずにケースから外装シートに直接伝わる部分がある。このため、かかる部分において接着層を介して熱が伝わる部分より熱伝達が効率よく行われる。これにより、外装シートが接着層によってケースの外面に配置されていても、外装シートの全面に接着層が配置される場合に比べ、内部の熱を外部に放出させ易くなる。 According to such a configuration, since the adhesive layer is not arranged on the entire surface of the exterior sheet, there is a portion where the heat inside the case is directly transmitted from the case to the exterior sheet without passing through the adhesive layer. Therefore, heat transfer is more efficient in such a portion than in the portion where heat is transferred through the adhesive layer. As a result, even if the outer sheet is arranged on the outer surface of the case with the adhesive layer, internal heat can be released to the outside more easily than when the adhesive layer is arranged over the entire surface of the outer sheet.

前記蓄電素子は、
前記ケースに収容され且つ前記電極体の熱が伝わる内部部材と、
前記ケースと前記電極体との間、及び前記ケースと前記内部部材との間に配置される絶縁部材と、を備え、
前記内部部材は、前記ケースの内面の一部に前記絶縁部材を介して当接し、
前記接着層は、前記ケースの外面の所定位置であって、前記内部部材が前記絶縁部材を介して該ケースの内面に当接している位置を避けた所定位置に配置されてもよい。ここで、内部部材が絶縁部材を介してケースの内面に当接している位置を避けた所定位置とは、ケースの外面の法線方向から見て、内部部材が絶縁部材を介してケースの内面に当接している位置と重ならない位置である。The storage element is
an internal member that is housed in the case and conducts the heat of the electrode body;
an insulating member disposed between the case and the electrode body and between the case and the internal member;
The internal member contacts a portion of the inner surface of the case via the insulating member,
The adhesive layer may be arranged at a predetermined position on the outer surface of the case, avoiding a position where the inner member is in contact with the inner surface of the case via the insulating member. Here, the predetermined position avoiding the position where the internal member is in contact with the inner surface of the case via the insulating member means that the internal member is located on the inner surface of the case via the insulating member when viewed from the normal direction of the outer surface of the case. It is a position that is in contact with and a position that does not overlap.

かかる構成によれば、ケースの外面において内部部材からの熱が伝わりやすい位置を避けた位置（ケースの外面の法線方向から見て重ならない位置）に接着層が配置されるため、内部部材を通じてケースに伝わった蓄電素子の内部の熱が接着層に邪魔されずに外装シートに伝わり、外部に放出される。 According to this configuration, since the adhesive layer is arranged at a position on the outer surface of the case that avoids a position where heat from the internal member is likely to be conducted (a position that does not overlap when viewed from the normal direction of the outer surface of the case), The heat inside the electric storage element transmitted to the case is transmitted to the exterior sheet without being hindered by the adhesive layer, and released to the outside.

前記蓄電素子では、
前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されてもよい。In the storage element,
The case has a rectangular tubular peripheral wall with a plurality of corners in the circumferential direction,
The exterior sheet is fixed to the peripheral wall while straddling at least one of the corners in the circumferential direction and under tension in the circumferential direction,
The adhesive layer may be arranged at a position not overlapping the top of the corner when viewed from the thickness direction of the peripheral wall of the case.

このように、張力が加わった状態で角部を跨ぐように外装シートが周壁の外面に配置されることで、角部において外装シートがケース（周壁）と確実に接触し、これにより、ケースから空気層を介して外装シートに熱が伝わる場合に比べ、内部からケースに伝わった熱が効率よく外装シートに伝わり、その結果、前記内部の熱がより外部に放出され易くなる。 In this way, the exterior sheet is arranged on the outer surface of the peripheral wall so as to straddle the corner while tension is applied, so that the exterior sheet reliably contacts the case (peripheral wall) at the corner. The heat transferred from the inside to the case is efficiently transferred to the outer sheet compared to the case where the heat is transferred to the outer sheet through the air layer, and as a result, the heat inside the case is more easily released to the outside.

前記蓄電素子では、
前記電極体は、積層された状態で巻回される電極を有し、
前記周壁は、前記電極体の巻回中心軸方向における該電極体の両側において該巻回中心軸方向と直交する一対の第一外壁面と、該第一外壁面と直交する方向に広がり且つ前記一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面と、を有し、
前記第二外壁面は、周方向において、前記第一外壁面より長く、
前記接着層は、前記第二外壁面に配置されてもよい。In the storage element,
The electrode body has an electrode wound in a laminated state,
The peripheral wall includes a pair of first outer wall surfaces perpendicular to the winding central axis direction on both sides of the electrode body in the winding central axis direction of the electrode body, and a pair of first outer wall surfaces extending in a direction perpendicular to the first outer wall surfaces and a pair of second outer wall surfaces connecting corresponding ends of the pair of first outer wall surfaces,
The second outer wall surface is longer than the first outer wall surface in the circumferential direction,
The adhesive layer may be disposed on the second outer wall surface.

このように、角筒状の周壁において外装シートが周方向に巻き付けられたときにケースの外面から外装シートが浮きやすい長壁面（周方向の寸法の大きな外壁面：第二外壁面）に接着層が配置されることで、外装シートとケースの外面との間に隙間が生じることが好適に抑えられる。 In this way, the adhesive layer is formed on the long wall surface (outer wall surface with a large circumferential dimension: second outer wall surface) where the outer sheet tends to float from the outer surface of the case when the outer sheet is wound in the circumferential direction on the rectangular tubular peripheral wall. By arranging the , the occurrence of a gap between the exterior sheet and the outer surface of the case is preferably suppressed.

前記蓄電素子では、
前記接着層は、前記電極体の巻回中心軸方向における該電極体の端部と、該巻回中心軸方向と直交する方向に重なる位置に配置されてもよい。In the storage element,
The adhesive layer may be arranged at a position overlapping an end portion of the electrode body in the winding central axis direction of the electrode body in a direction orthogonal to the winding central axis direction.

電極体において、通常、集電体等が接続される巻回中心軸方向の端部（未塗工部等）は、充放電による膨張等によってケースの内面に接触し難い。このため、ケースの外面における前記電極体の端部と対応する位置に接着層が配置されることで、ケースの外面において電極体からの熱が伝わりやすい位置を避けた位置に接着層が配置される。これにより、電極体からケースに伝わった熱が接着層に邪魔されずに外装シートに伝わり、外部に放出される。 In the electrode body, the end portion (uncoated portion, etc.) in the winding center axis direction to which the current collector or the like is connected is usually less likely to come into contact with the inner surface of the case due to expansion due to charging/discharging or the like. Therefore, by arranging the adhesive layer at a position corresponding to the end portion of the electrode body on the outer surface of the case, the adhesive layer is arranged at a position on the outer surface of the case that avoids a position where heat from the electrode body is likely to be conducted. be. As a result, the heat transmitted from the electrode body to the case is transmitted to the exterior sheet without being hindered by the adhesive layer, and released to the outside.

他の実施形態の蓄電素子は、
電極体と、
前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケースと、
前記周壁の周方向に延び且つ該周壁の外面を覆う外装シートと、
周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層と、を備え、
前記積層された一方の端部及び他方の端部は、前記角部の頂部と重ならない位置に配置される。A power storage device of another embodiment includes:
an electrode body;
a case that surrounds the electrode body and has a rectangular cylindrical peripheral wall that has a plurality of corners in the circumferential direction;
an exterior sheet extending in the circumferential direction of the peripheral wall and covering the outer surface of the peripheral wall;
an adhesive layer that bonds one end and the other end of the exterior sheet in a state in which the one end and the other end are laminated in the circumferential direction,
The stacked one end and the other end are arranged at a position not overlapping the top of the corner.

張力によって外装シートがケース（周壁）の角部と確実に接触するため、この位置（角部の頂部）を避けた位置に、ケースから伝わった熱を外部に放出し難い外装シートにおける厚さ寸法の大きくなった部位（接着層を介して端部同士が積層された部位）が配置されることで、外装シートが接着層によってケースの外面に配置されていても内部の熱が外部に放出され易い。 Since the outer sheet is in contact with the corners of the case (peripheral wall) due to tension, the thickness of the outer sheet avoids this position (the top of the corner) so that the heat transferred from the case is difficult to be released to the outside. By arranging the part where the heat is increased (the part where the ends are laminated via the adhesive layer), even if the exterior sheet is placed on the outer surface of the case by the adhesive layer, the internal heat is released to the outside. easy.

上記のいずれかの蓄電素子では、
前記外装シートの熱伝導率は、０．６Ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下であってもよい。In any of the above storage elements,
The exterior sheet may have a thermal conductivity of 0.6 W/(m·K) or more and 30 W/(m·K) or less.

このような熱伝導率の外装シートが用いられることで、ケースから外装シートに伝わった熱が好適に外部に放出される。 By using the exterior sheet having such thermal conductivity, the heat transferred from the case to the exterior sheet is preferably released to the outside.

上記のいずれかの蓄電素子では、
前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置されてもよい。In any of the above storage elements,
The outer surface of the case includes a first surface on which external terminals are arranged and a second surface opposite to the first surface,
The exterior sheet covers the second surface,
The adhesive layer may be arranged at a position facing a region of the outer surface of the case other than the second surface.

蓄電素子を冷却する場合、ケースの外面における外部端子等の構造物が配置された面と反対側の面が冷却されることが多い。このため、上記の構成によれば、ケースの外面における前記冷却が行われやすい面以外の領域と対向する位置に接着層が配置されている（即ち、冷却されやすい位置を避けた位置に接着層が配置される）ことで、蓄電素子に対して前記冷却が行われる場合に十分な冷却効果が得られる。 When cooling the power storage element, the surface opposite to the surface on which structures such as external terminals are arranged on the outer surface of the case is often cooled. For this reason, according to the above configuration, the adhesive layer is arranged at a position facing a region other than the surface that is easily cooled on the outer surface of the case (i.e., the adhesive layer is arranged at a position that avoids a position that is easily cooled). are arranged), a sufficient cooling effect can be obtained when the cooling is performed on the electric storage element.

他の実施形態の蓄電装置では、
第一方向に並ぶ複数の蓄電素子であって、上記のいずれかの蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、を備える。In the power storage device of another embodiment,
a plurality of power storage elements arranged in a first direction, the plurality of power storage elements including at least one of the above power storage elements;
a holding member that holds the plurality of power storage elements.

かかる構成によれば、保持部材によって保持されていることで、蓄電素子のそれぞれに第一方向の力が加わるため、第一方向において外装シートとケースの外面とが直接対向する部分を有する蓄電素子において前記第一方向に加わる力によって外装シートとケースとが密着する。これにより、該蓄電素子においてケースから外装シートへの熱伝達が好適に行われる。その結果、複数の蓄電素子を備える蓄電装置において、外装シートが接着層によってケースの外面に配置されている蓄電素子が含まれていても、該蓄電素子において内部の熱は、外部に放出され易い。 According to such a configuration, since a force in the first direction is applied to each storage element by being held by the holding member, the storage element has a portion where the exterior sheet and the outer surface of the case directly face each other in the first direction. At , the exterior sheet and the case are brought into close contact with each other due to the force applied in the first direction. As a result, the heat transfer from the case to the outer sheet is favorably performed in the electric storage element. As a result, in a power storage device having a plurality of power storage elements, even if the power storage element includes a power storage element whose outer sheet is arranged on the outer surface of the case by means of an adhesive layer, the heat inside the power storage element is likely to be released to the outside. .

前記蓄電装置は、
前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置されてもよい。The power storage device
A cooling member arranged along the row of the plurality of power storage elements arranged in the first direction and cooling the plurality of power storage elements,
The adhesive layer may be arranged at a position facing a region other than the region cooled by the cooling member on the outer surface of the case.

このように、ケースの外面における冷却部材によって冷却される領域以外の領域と対向する位置（避けた位置）に接着層が配置されることで、各蓄電素子において十分な冷却効果が得られる。 In this way, by arranging the adhesive layer at a position (avoiding position) facing the region other than the region cooled by the cooling member on the outer surface of the case, a sufficient cooling effect can be obtained in each power storage element.

他の実施形態の蓄電素子は、
電極体と、
前記電極体を収容するケースと、
前記電極体と前記ケースとの間に配置される絶縁材と、
前記ケースの外面に配置される外装シートと、を備え、
前記絶縁材及び前記外装シートの少なくとも一方の熱伝導率は、０．６Ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下である。A power storage device of another embodiment includes:
an electrode body;
a case that accommodates the electrode body;
an insulating material disposed between the electrode body and the case;
and an exterior sheet arranged on the outer surface of the case,
At least one of the insulating material and the exterior sheet has a thermal conductivity of 0.6 W/(m·K) or more and 30 W/(m·K) or less.

このような熱伝導率の絶縁材及び外装シートの少なくとも一方が用いられることで、熱が絶縁材及び外装シートの少なくとも一方を通過し易くなる。このため、電極体で生じた熱（即ち、ケースの内部の熱）がケースの外部へ放出され易くなる。 By using at least one of the insulating material and the exterior sheet having such thermal conductivity, heat can easily pass through at least one of the insulating material and the exterior sheet. Therefore, the heat generated in the electrode body (that is, the heat inside the case) is easily released to the outside of the case.

以上の実施形態によれば、外装シートが接着層によってケースの外面に配置されていても、内部の熱を外部に放出させ易い蓄電素子及び蓄電装置を提供することができる。 According to the above-described embodiments, it is possible to provide a power storage element and power storage device that can easily release internal heat to the outside even when the outer sheet is arranged on the outer surface of the case by means of the adhesive layer.

以下、本発明に係る蓄電素子の一実施形態について、図１～図５を参照しつつ説明する。蓄電素子には、一次電池、二次電池、キャパシタ等がある。本実施形態では、蓄電素子の一例として、充放電可能な二次電池について説明する。尚、本実施形態の各構成部材（各構成要素）の名称は、本実施形態におけるものであり、背景技術における各構成部材（各構成要素）の名称と異なる場合がある。 An embodiment of a power storage device according to the present invention will be described below with reference to FIGS. 1 to 5. FIG. Electric storage elements include primary batteries, secondary batteries, capacitors, and the like. In this embodiment, a chargeable/dischargeable secondary battery will be described as an example of the storage element. The name of each component (each component) of this embodiment is the one in this embodiment, and may differ from the name of each component (each component) in the background art.

本実施形態の蓄電素子は、非水電解質二次電池である。より詳しくは、蓄電素子は、リチウムイオンの移動に伴って生じる電子移動を利用したリチウムイオン二次電池である。この種の蓄電素子は、電気エネルギーを供給する。蓄電素子は、単一又は複数で使用される。具体的に、要求される出力及び要求される電圧が小さいときには、蓄電素子は、単一で使用される。一方、要求される出力及び要求される電圧の少なくとも一方が大きいときには、蓄電素子は、他の蓄電素子と組み合わされて蓄電装置に用いられる。前記蓄電装置では、該蓄電装置に用いられる蓄電素子が電気エネルギーを供給する。 The power storage device of this embodiment is a non-aqueous electrolyte secondary battery. More specifically, the power storage element is a lithium ion secondary battery that utilizes electron transfer that accompanies movement of lithium ions. A storage element of this kind supplies electrical energy. A single power storage element or a plurality of power storage elements are used. Specifically, when the required output and required voltage are small, a single storage element is used. On the other hand, when at least one of the required output and the required voltage is large, the storage element is combined with other storage elements and used in the storage device. In the power storage device, power storage elements used in the power storage device supply electrical energy.

蓄電素子は、図１～図４に示すように、電極体２と、電極体２を収容するケース３と、ケース３の外面に沿って広がる外装シート７と、外装シート７をケース３の外面に固定する接着層８（図２及び図５参照）と、を備える。また、蓄電素子１は、ケース３の外面に配置される外部端子４と、電極体２と外部端子４とを導通させる集電体（内部部材）５と、を備える。本実施形態の蓄電素子１は、電極体２とケース３との間に配置される絶縁部材（絶縁材）６等も、備える。 As shown in FIGS. 1 to 4, the electric storage element includes an electrode body 2, a case 3 that accommodates the electrode body 2, an exterior sheet 7 extending along the outer surface of the case 3, and an exterior sheet 7 extending along the outer surface of the case 3. and an adhesive layer 8 (see FIGS. 2 and 5) for fixing to. The storage element 1 also includes an external terminal 4 arranged on the outer surface of the case 3 and a current collector (internal member) 5 that electrically connects the electrode body 2 and the external terminal 4 . The power storage device 1 of the present embodiment also includes an insulating member (insulating material) 6 and the like arranged between the electrode body 2 and the case 3 .

電極体２は、積層された状態で巻回される電極（正極２３及び負極２４）を有する。具体的に、電極体２は、巻芯２１と、正極２３と負極２４とが互いに絶縁された状態で積層された積層体２２であって、巻芯２１の周囲に巻回された積層体２２と、を備える（図３及び図４参照）。電極体２においてリチウムイオンが正極２３と負極２４との間を移動することにより、蓄電素子１が充放電する。 The electrode body 2 has electrodes (a positive electrode 23 and a negative electrode 24) that are wound in a laminated state. Specifically, the electrode body 2 is a laminate 22 in which a core 21 and a positive electrode 23 and a negative electrode 24 are laminated while being insulated from each other, and the laminate 22 is wound around the core 21. and (see FIGS. 3 and 4). When lithium ions move between the positive electrode 23 and the negative electrode 24 in the electrode body 2 , the electric storage element 1 is charged and discharged.

巻芯２１は、通常、絶縁材料によって形成される。本実施形態の巻芯２１は、筒状、より詳しくは、偏平な筒状である。この巻芯２１は、可撓性又は熱可塑性を有するシートを巻回することによって形成される。本実施形態の前記シートは、合成樹脂によって形成されている。 The winding core 21 is usually made of an insulating material. The winding core 21 of this embodiment has a cylindrical shape, more specifically, a flat cylindrical shape. The winding core 21 is formed by winding a flexible or thermoplastic sheet. The sheet of the present embodiment is made of synthetic resin.

正極２３は、帯状の金属箔２３１と、金属箔２３１に重ねられる正極活物質層２３２と、を有する。この正極活物質層２３２は、金属箔２３１における幅方向の一方の端縁部（非被覆部）を露出させた状態で、該金属箔２３１に重ねられている。本実施形態の金属箔２３１は、例えば、アルミニウム箔である。 The positive electrode 23 has a strip-shaped metal foil 231 and a positive electrode active material layer 232 overlaid on the metal foil 231 . The positive electrode active material layer 232 is superimposed on the metal foil 231 with one widthwise edge (uncovered portion) of the metal foil 231 exposed. The metal foil 231 of this embodiment is, for example, an aluminum foil.

負極２４は、帯状の金属箔２４１と、金属箔２４１に重ねられる負極活物質層２４２と、を有する。この負極活物質層２４２は、金属箔２４１における幅方向の他方（正極２３の金属箔２３１の非被覆部と反対側）の端縁部（非被覆部）を露出させた状態で、該金属箔２４１に重ねられている。本実施形態の金属箔２４１は、例えば、銅箔である。 The negative electrode 24 has a strip-shaped metal foil 241 and a negative electrode active material layer 242 overlaid on the metal foil 241 . The negative electrode active material layer 242 is formed by exposing the other edge portion (uncovered portion) of the metal foil 241 in the width direction (the side opposite to the uncovered portion of the metal foil 231 of the positive electrode 23). 241. The metal foil 241 of this embodiment is, for example, copper foil.

本実施形態の電極体２では、以上のように構成される正極２３と負極２４とがセパレータ２５によって絶縁された状態で巻回される。即ち、本実施形態の電極体２では、正極２３、負極２４、及びセパレータ２５の積層体２２が巻回されている。 In the electrode body 2 of the present embodiment, the positive electrode 23 and the negative electrode 24 configured as described above are wound while being insulated by the separator 25 . That is, in the electrode body 2 of this embodiment, the laminate 22 of the positive electrode 23, the negative electrode 24, and the separator 25 is wound.

セパレータ２５は、絶縁性を有する部材であり、正極２３と負極２４との間に配置される。これにより、電極体２（詳しくは、積層体２２）において、正極２３と負極２４とが互いに絶縁される。また、セパレータ２５は、ケース３内において、電解液を保持する。これにより、蓄電素子１の充放電時において、リチウムイオンが、セパレータ２５を挟んで交互に積層される正極２３と負極２４との間を移動可能となる。 The separator 25 is a member having insulating properties and is arranged between the positive electrode 23 and the negative electrode 24 . Thereby, the positive electrode 23 and the negative electrode 24 are insulated from each other in the electrode body 2 (specifically, the laminate 22). Moreover, the separator 25 retains the electrolytic solution inside the case 3 . This allows lithium ions to move between the positive electrode 23 and the negative electrode 24 that are alternately laminated with the separator 25 interposed therebetween during charging and discharging of the storage device 1 .

このセパレータ２５は、帯状であり、例えば、ポリエチレン、ポリプロピレン、セルロース、ポリアミドなどの多孔質膜によって構成される。本実施形態のセパレータ２５は、ＳｉＯ２粒子、Ａｌ２Ｏ３粒子、ベーマイト（アルミナ水和物）等の無機粒子を含んだ無機層が多孔質膜によって形成された基材の上に設けられることで形成されている。本実施形態のセパレータ２５の基材は、例えば、ポリエチレンによって形成される。The separator 25 is strip-shaped and is composed of a porous film of polyethylene, polypropylene, cellulose, polyamide, or the like. In the separator 25 of the present embodiment, an inorganic layer containing inorganic particles such as SiO 2 particles, Al 2 O 3 particles, and boehmite (alumina hydrate) is provided on a base material formed of a porous film. is formed by The base material of the separator 25 of this embodiment is made of polyethylene, for example.

セパレータ２５の幅方向の寸法は、負極活物質層２４２の幅より大きい。セパレータ２５は、正極活物質層２３２と負極活物質層２４２とが厚さ方向（積層方向）に重なるように幅方向に位置ずれした状態で重ね合わされた正極２３と負極２４との間に配置される。このとき、正極２３の非被覆部と、負極２４の非被覆部とは重なっていない。即ち、正極２３の非被覆部が、正極２３と負極２４との重なる領域から幅方向（積層方向と直交する方向）に突出し、且つ、負極２４の非被覆部が、正極２３と負極２４との重なる領域から幅方向（正極２３の非被覆部の突出方向と反対の方向）に突出する。このような状態で積層された正極２３、負極２４、及びセパレータ２５（即ち、積層体２２）が巻回されることによって、電極体２が形成される。また、本実施形態の電極体２では、正極２３の非被覆部又は負極２４の非被覆部のみが積層された部位によって、電極体２における非被覆積層部２６が構成される。 The widthwise dimension of the separator 25 is larger than the width of the negative electrode active material layer 242 . The separator 25 is arranged between the positive electrode 23 and the negative electrode 24 which are superimposed with a positional deviation in the width direction so that the positive electrode active material layer 232 and the negative electrode active material layer 242 overlap in the thickness direction (stacking direction). be. At this time, the uncovered portion of the positive electrode 23 and the uncovered portion of the negative electrode 24 do not overlap. That is, the uncovered portion of the positive electrode 23 protrudes in the width direction (direction perpendicular to the stacking direction) from the overlapping region of the positive electrode 23 and the negative electrode 24, and the uncovered portion of the negative electrode 24 extends from the area between the positive electrode 23 and the negative electrode 24. It protrudes in the width direction (the direction opposite to the direction in which the uncovered portion of the positive electrode 23 protrudes) from the overlapping region. The electrode body 2 is formed by winding the positive electrode 23, the negative electrode 24, and the separator 25 (that is, the laminated body 22) laminated in such a state. In addition, in the electrode body 2 of the present embodiment, the non-coated laminated portion 26 of the electrode body 2 is constituted by the portion where only the non-coated portion of the positive electrode 23 or the non-coated portion of the negative electrode 24 is laminated.

非被覆積層部２６は、電極体２における集電体５と導通される部位である。本実施形態の非被覆積層部２６は、巻回された正極２３、負極２４、及びセパレータ２５の巻回中心軸Ｃ方向から見て、中空部２７（図２及び図４参照）を挟んで二つの部位（二分された非被覆積層部）２６１に区分けされる。 The non-coated laminate portion 26 is a portion of the electrode body 2 that is electrically connected to the current collector 5 . The uncoated laminated portion 26 of the present embodiment has two layers with a hollow portion 27 (see FIGS. 2 and 4) interposed therebetween when viewed from the winding central axis C direction of the wound positive electrode 23, the negative electrode 24, and the separator 25. It is divided into two sections (bisected uncovered laminate sections) 261 .

以上のように構成される非被覆積層部２６は、電極体２の各極に設けられる。即ち、正極２３の非被覆部のみが積層された非被覆積層部２６が電極体２における正極の非被覆積層部を構成し、負極２４の非被覆部のみが積層された非被覆積層部２６が電極体２における負極の非被覆積層部を構成する。 The uncovered laminated portion 26 configured as described above is provided at each pole of the electrode body 2 . That is, the uncovered laminated portion 26 in which only the uncovered portion of the positive electrode 23 is laminated constitutes the uncovered laminated portion of the positive electrode in the electrode assembly 2, and the uncovered laminated portion 26 in which only the uncovered portion of the negative electrode 24 is laminated. It constitutes the non-coated laminated portion of the negative electrode in the electrode body 2 .

ケース３は、開口を有するケース本体３１と、ケース本体３１の開口を塞ぐ（閉じる）蓋板３２と、を有する。ケース３は、電極体２及び集電体５等と共に、電解液を内部空間３３（図３参照）に収容する。ケース３は、電解液に耐性を有する金属によって形成される。本実施形態のケース３は、例えば、アルミニウム、又は、アルミニウム合金等のアルミニウム系金属材料によって形成される。 The case 3 has a case body 31 having an opening and a cover plate 32 that blocks (closes) the opening of the case body 31 . The case 3 accommodates an electrolytic solution in an internal space 33 (see FIG. 3) together with the electrode assembly 2, current collector 5, and the like. The case 3 is made of metal that is resistant to the electrolyte. The case 3 of the present embodiment is made of, for example, aluminum or an aluminum-based metal material such as an aluminum alloy.

電解液は、非水溶液系電解液である。電解液は、有機溶媒に電解質塩を溶解させることによって得られる。有機溶媒は、例えば、プロピレンカーボネート及びエチレンカーボネートなどの環状炭酸エステル類、ジメチルカーボネート、ジエチルカーボネート、及びエチルメチルカーボネートなどの鎖状カーボネート類である。電解質塩は、ＬｉＣｌＯ４、ＬｉＢＦ４、及びＬｉＰＦ６等である。本実施形態の電解液は、プロピレンカーボネート、ジメチルカーボネート、及びエチルメチルカーボネートを、プロピレンカーボネート：ジメチルカーボネート：エチルメチルカーボネート＝３：２：５の割合で調整した混合溶媒に、１ｍｏｌ／ＬのＬｉＰＦ６を溶解させたものである。The electrolytic solution is a non-aqueous electrolytic solution. An electrolytic solution is obtained by dissolving an electrolytic salt in an organic solvent. Organic solvents are, for example, cyclic carbonates such as propylene carbonate and ethylene carbonate, chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. Electrolyte salts are LiClO 4 , LiBF 4 , LiPF 6 and the like. The electrolytic solution of the present embodiment is a mixed solvent of propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate adjusted to a ratio of propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5, and 1 mol / L of LiPF 6 is dissolved.

ケース３は、図１～図３に示すように、ケース本体３１の開口周縁部３４と、蓋板３２の周縁部とを重ね合わせた状態で接合することによって形成される。また、ケース３では、内部空間３３がケース本体３１と蓋板３２とによって画定されている。本実施形態のケース３では、ケース本体３１の開口周縁部３４と蓋板３２の周縁部とが溶接によって接合されている。 As shown in FIGS. 1 to 3, the case 3 is formed by joining the opening peripheral edge portion 34 of the case body 31 and the peripheral edge portion of the cover plate 32 in an overlapping state. In the case 3 , an internal space 33 is defined by the case body 31 and the cover plate 32 . In the case 3 of this embodiment, the opening peripheral edge portion 34 of the case body 31 and the peripheral edge portion of the cover plate 32 are joined by welding.

ケース本体３１は、板状の閉塞部３１１と、閉塞部３１１の周縁に接続される筒状の胴部（周壁）３１２と、を備える。 The case main body 31 includes a plate-like closing portion 311 and a cylindrical trunk portion (peripheral wall) 312 connected to the peripheral edge of the closing portion 311 .

閉塞部３１１は、ケース本体３１が開口を上に向けた姿勢で配置されたときにケース本体３１の下端に位置する（即ち、前記開口が上を向いたときのケース本体３１の底壁となる）部位である。閉塞部３１１は、該閉塞部３１１の法線方向から見て、矩形状である。 The closing part 311 is located at the lower end of the case body 31 when the case body 31 is arranged with the opening facing upward (that is, it becomes the bottom wall of the case body 31 when the opening faces upward). ) is the site. The closing portion 311 has a rectangular shape when viewed from the normal direction of the closing portion 311 .

以下では、閉塞部３１１の長辺方向を直交座標系のＸ軸方向とし、閉塞部３１１の短辺方向を直交座標系のＹ軸方向とし、閉塞部３１１の法線方向を直交座標系のＺ軸方向とする。 Hereinafter, the long side direction of the blocking portion 311 is defined as the X-axis direction of the rectangular coordinate system, the short side direction of the blocking portion 311 is defined as the Y-axis direction of the rectangular coordinate system, and the normal direction of the blocking portion 311 is defined as the Z direction of the rectangular coordinate system. Axial direction.

胴部３１２は、周方向に複数の角部を有する角筒形状である。本実施形態の胴部３１２は、周方向に四つの角部を有する角筒形状、より詳しくは、偏平な角筒形状を有する。胴部３１２は、閉塞部３１１の周縁における長辺から延びる一対の長壁部３１３と、閉塞部３１１の周縁における短辺から延びる一対の短壁部３１４とを有する。即ち、一対の長壁部３１３は、Ｙ軸方向に間隔（詳しくは、閉塞部３１１の周縁における短辺に相当する間隔）を空けて対向し、一対の短壁部３１４は、Ｘ軸方向に間隔（詳しくは、閉塞部３１１の周縁における長辺に相当する間隔）を空けて対向する。短壁部３１４が一対の長壁部３１３の対応（詳しくは、Ｙ軸方向に対向）する端部同士をそれぞれ接続することによって、角筒状の胴部３１２が形成される。 The trunk portion 312 has a rectangular tubular shape with a plurality of corners in the circumferential direction. The trunk portion 312 of the present embodiment has a square tube shape having four corners in the circumferential direction, more specifically, a flat square tube shape. The trunk portion 312 has a pair of long wall portions 313 extending from the long sides of the peripheral edge of the closing portion 311 and a pair of short wall portions 314 extending from the short sides of the peripheral edge of the closing portion 311 . That is, the pair of long wall portions 313 face each other with an interval in the Y-axis direction (specifically, an interval corresponding to the short side of the peripheral edge of the closing portion 311), and the pair of short wall portions 314 are spaced apart in the X-axis direction. (More specifically, they are opposed to each other with a space corresponding to the long side of the peripheral edge of the closing portion 311). The short wall portion 314 connects the corresponding (specifically, facing in the Y-axis direction) ends of the pair of long wall portions 313 to each other, thereby forming the trunk portion 312 in the shape of a rectangular tube.

以上のように、ケース本体３１は、開口方向（Ｚ軸方向）における一方の端部が塞がれた角筒形状（即ち、有底角筒形状）を有する。このケース本体３１には、電極体２が巻回中心軸Ｃ方向をＸ軸方向に向けた状態で収容される。この電極体２がケース本体３１に収容された状態において、胴部３１２は、電極体２の巻回中心軸Ｃ方向における該電極体２の両側において該巻回中心軸Ｃ方向と直交する一対の第一外壁面（短壁部３１４の外面）と、該第一外壁面と直交する方向に広がり且つ一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面（長壁部３１３の外面）と、を有する。 As described above, the case body 31 has a square tubular shape (that is, a bottomed square tubular shape) with one end in the opening direction (Z-axis direction) closed. The electrode body 2 is accommodated in the case body 31 with the direction of the winding central axis C facing the X-axis direction. When the electrode body 2 is accommodated in the case main body 31, the body part 312 is formed of a pair of electrodes perpendicular to the winding center axis C direction on both sides of the electrode body 2 in the winding center axis C direction of the electrode body 2. A first outer wall surface (outer surface of the short wall portion 314) and a pair of second outer wall surfaces (long wall portions) that extend in a direction orthogonal to the first outer wall surface and connect corresponding ends of the pair of first outer wall surfaces 313) and

蓋板３２は、ケース本体３１の開口を塞ぐ板状の部材である。具体的に、蓋板３２の輪郭は、Ｚ軸方向から見て、ケース本体３１の開口周縁部３４に対応した形状である。即ち、蓋板３２は、Ｚ軸方向から見て、Ｘ軸方向に長い矩形状の板材である。この蓋板３２は、ケース本体３１の開口を塞ぐように該ケース本体３１に当接する。より具体的には、蓋板３２が開口を塞ぐように、蓋板３２の周縁部がケース本体３１の開口周縁部３４に重ねられる。開口周縁部３４と蓋板３２とが重ねられた状態で、蓋板３２とケース本体３１との境界部が溶接される。これにより、ケース３が構成される。 The lid plate 32 is a plate-like member that closes the opening of the case body 31 . Specifically, the contour of the cover plate 32 has a shape corresponding to the opening peripheral portion 34 of the case body 31 when viewed from the Z-axis direction. That is, the cover plate 32 is a rectangular plate member elongated in the X-axis direction when viewed from the Z-axis direction. The cover plate 32 contacts the case body 31 so as to close the opening of the case body 31 . More specifically, the peripheral edge of the cover plate 32 overlaps the opening peripheral edge 34 of the case body 31 so that the cover plate 32 closes the opening. A boundary portion between the cover plate 32 and the case body 31 is welded while the opening peripheral edge portion 34 and the cover plate 32 are overlapped. Case 3 is thus configured.

外装シート７は、ケース３の外面と接着層８を介して対向する部分７１と、ケース３の外面と直接対向する部分７２と、を有する（図２参照）。この外装シート７は、絶縁性を有する樹脂によって形成されている。外装シート７の熱伝導率は、０．６ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下である。具体的には、例えば外装シート７は、高熱伝導性ポリカーボネート、高熱伝導性ポリフェニレンサルファイド、高熱伝導性ナイロンによって形成される。 The exterior sheet 7 has a portion 71 facing the outer surface of the case 3 via the adhesive layer 8 and a portion 72 directly facing the outer surface of the case 3 (see FIG. 2). The exterior sheet 7 is made of insulating resin. The thermal conductivity of the exterior sheet 7 is 0.6 w/(m·K) or more and 30 W/(m·K) or less. Specifically, the exterior sheet 7 is made of, for example, highly thermally conductive polycarbonate, highly thermally conductive polyphenylene sulfide, or highly thermally conductive nylon.

外装シート７は、図１～図３、及び図５に示すように、ケース３の胴部３１２の外面を覆う。この外装シート７は、胴部３１２の周方向に延びる帯状である。この外装シート７は、少なくとも一つの角部を周方向に跨ぎ且つ周方向の張力が加わっている状態で胴部３１２に固定されている。詳しくは、以下の通りである。 The outer sheet 7 covers the outer surface of the body portion 312 of the case 3, as shown in FIGS. The exterior sheet 7 has a strip shape extending in the circumferential direction of the body portion 312 . The exterior sheet 7 is fixed to the body section 312 while straddling at least one corner in the circumferential direction and being tensioned in the circumferential direction. Details are as follows.

外装シート７の長手方向の一方の端部（捲き始めの端部）をケース３の外面に固定する接着層８である第一接着層８１は、胴部３１２の厚さ方向において角部の頂部３１５と重ならない位置に配置されている。詳しくは、第一接着層８１は、長壁部３１３と対向する位置に配置されている。より詳しくは、第一接着層８１は、巻回中心軸Ｃ方向における電極体２の端部（非被覆積層部）２６と、Ｙ軸方向から見て重なる位置に配置される。このとき、第一接着層８１は、胴部３１２の所定位置であって、集電体５が絶縁部材６を介して胴部３１２の内面に当接している位置を避けた位置に配置されている。この位置から外装シート７が胴部３１２に巻き付けられている。このとき、外装シート７は、胴部３１２の周方向に張力を加えられつつ該胴部３１２に巻き付けられている。そして、外装シート７は、少なくとも一つの角部を周方向に跨ぎ且つ周方向の張力が加わっている状態で胴部３１２に固定されている。本実施形態の外装シート７は、胴部３１２を全周に亘って覆っている（囲っている）。具体的に、外装シート７の長手方向の他方の端部（巻き終わりの端部）をケース３の外面に固定する接着層８である第二接着層８２は、第一接着層８１と重なる位置に配置されている。即ち、外装シート７の一方（捲き始め）の端部と、他方（巻き終わり）の端部とは、第二接着層８２を介して重なっている。 The first adhesive layer 81, which is the adhesive layer 8 that fixes one end (the end of the winding start) in the longitudinal direction of the exterior sheet 7 to the outer surface of the case 3, is formed at the top of the corner in the thickness direction of the body 312. It is arranged at a position not overlapping with 315 . Specifically, the first adhesive layer 81 is arranged at a position facing the long wall portion 313 . More specifically, the first adhesive layer 81 is arranged at a position overlapping the end portion (uncovered laminate portion) 26 of the electrode body 2 in the winding central axis C direction when viewed from the Y-axis direction. At this time, the first adhesive layer 81 is arranged at a predetermined position of the trunk portion 312 , avoiding the position where the current collector 5 is in contact with the inner surface of the trunk portion 312 via the insulating member 6 . there is The exterior sheet 7 is wound around the body portion 312 from this position. At this time, the exterior sheet 7 is wound around the body portion 312 while being tensioned in the circumferential direction of the body portion 312 . The exterior sheet 7 is fixed to the body section 312 while straddling at least one corner in the circumferential direction and being tensioned in the circumferential direction. The exterior sheet 7 of the present embodiment covers (encloses) the body portion 312 over the entire circumference. Specifically, the second adhesive layer 82, which is the adhesive layer 8 that fixes the other end (end of winding) in the longitudinal direction of the exterior sheet 7 to the outer surface of the case 3, is positioned so as to overlap the first adhesive layer 81. are placed in That is, one end (the start of winding) and the other end (the end of winding) of the exterior sheet 7 overlap each other with the second adhesive layer 82 interposed therebetween.

外部端子４は、他の蓄電素子の外部端子又は外部機器等と電気的に接続される部位である。外部端子４は、導電性を有する部材によって形成される。例えば、外部端子４は、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料、銅又は銅合金等の銅系金属材料等の溶接性の高い金属材料によって形成される。本実施形態の外部端子４は、図１～図３に示す通り、バスバ等を溶接可能な面４１を有する。 The external terminal 4 is a portion electrically connected to an external terminal of another storage element or an external device. The external terminal 4 is made of a conductive member. For example, the external terminal 4 is made of a highly weldable metal material such as an aluminum-based metal material such as aluminum or an aluminum alloy, or a copper-based metal material such as copper or a copper alloy. As shown in FIGS. 1 to 3, the external terminal 4 of this embodiment has a surface 41 onto which a busbar or the like can be welded.

集電体５は、ケース３内に配置され、電極体２と通電可能に直接又は間接に接続される。本実施形態の集電体５は、クリップ部材５０を介して電極体２と通電可能に接続される。即ち、蓄電素子１は、電極体２と集電体５とを通電可能に接続するクリップ部材５０を備える。 The current collector 5 is arranged in the case 3 and electrically connected to the electrode body 2 directly or indirectly. The current collector 5 of the present embodiment is electrically connected to the electrode body 2 via the clip member 50 . That is, the storage element 1 includes a clip member 50 that electrically connects the electrode body 2 and the current collector 5 .

集電体５は、導電性を有する部材によって形成される。集電体５は、ケース３の内面に沿って配置される。本実施形態の集電体５は、外部端子４とクリップ部材５０とを通電可能に接続する。具体的に、集電体５は、外部端子４と通電可能に接続される第一接続部５１と、電極体２と通電可能に接続される第二接続部５２と、第一接続部５１と第二接続部５２とを接続する屈曲部５３と、を有する。集電体５では、屈曲部５３がケース３内の蓋板３２と短壁部３１４との境界近傍に配置され、第一接続部５１が屈曲部５３から蓋板３２に沿って延び、第二接続部５２が屈曲部５３から短壁部３１４に沿って延びる。第二接続部５２は、短壁部３１４の近傍から非被覆積層部２６に向けて延びると共に第二接続部５２と同方向に延びる接合片５５を少なくとも一つ有する。この接合片５５は、クリップ部材５０と接合される。本実施形態の接合片５５は、例えば、超音波溶接によってクリップ部材５０と接合される。 The current collector 5 is made of a conductive member. A current collector 5 is arranged along the inner surface of the case 3 . The current collector 5 of this embodiment electrically connects the external terminal 4 and the clip member 50 . Specifically, the current collector 5 includes a first connection portion 51 that is electrically connected to the external terminal 4, a second connection portion 52 that is electrically connected to the electrode body 2, and the first connection portion 51. and a bending portion 53 that connects to the second connection portion 52 . In the current collector 5, the bent portion 53 is arranged near the boundary between the lid plate 32 and the short wall portion 314 in the case 3, the first connection portion 51 extends from the bent portion 53 along the lid plate 32, and the second A connecting portion 52 extends from the bent portion 53 along the short wall portion 314 . The second connection portion 52 has at least one joint piece 55 extending from the vicinity of the short wall portion 314 toward the uncovered laminated portion 26 and extending in the same direction as the second connection portion 52 . This joining piece 55 is joined to the clip member 50 . The joining piece 55 of this embodiment is joined to the clip member 50 by, for example, ultrasonic welding.

以上のように構成される集電体５は、蓄電素子１の正極と負極とにそれぞれ配置される。本実施形態の蓄電素子１では、集電体５は、ケース３内において、電極体２の正極の非被覆積層部２６と、負極の非被覆積層部２６とにそれぞれ配置される。正極の集電体５と負極の集電体５とは、異なる素材によって形成される。具体的に、正極の集電体５は、例えば、アルミニウム又はアルミニウム合金によって形成され、負極の集電体５は、例えば、銅又は銅合金によって形成される。 The current collectors 5 configured as described above are arranged on the positive electrode and the negative electrode of the storage element 1, respectively. In the electric storage device 1 of the present embodiment, the current collector 5 is arranged in the case 3 on the positive electrode uncovered laminate portion 26 and the negative electrode uncovered laminate portion 26 of the electrode body 2 . The positive electrode current collector 5 and the negative electrode current collector 5 are made of different materials. Specifically, the positive electrode current collector 5 is made of, for example, aluminum or an aluminum alloy, and the negative electrode current collector 5 is made of, for example, copper or a copper alloy.

クリップ部材５０は、電極体２の非被覆積層部２６（詳しくは、二分された非被覆積層部２６１）において積層された正極２３又は負極２４を束ねるように挟む。これにより、クリップ部材５０は、非被覆積層部２６において積層される正極２３同士、又は負極２４同士を導通させる。本実施形態のクリップ部材５０は、断面がＵ字状となるように板状の金属材料が曲げ加工されることによって形成される。 The clip member 50 sandwiches the positive electrode 23 or the negative electrode 24 laminated in the non-coated laminated portion 26 (specifically, the bisected non-coated laminated portion 261) of the electrode body 2 so as to bundle them. Thereby, the clip member 50 electrically connects the positive electrodes 23 or the negative electrodes 24 stacked in the non-coated stacked portion 26 . The clip member 50 of the present embodiment is formed by bending a plate-like metal material so that the cross section is U-shaped.

絶縁部材６は、図２及び図３に示すように、ケース３（詳しくはケース本体３１）と電極体２との間に配置される。この絶縁部材６は、絶縁性を有する樹脂によって形成されている。絶縁部材６の熱伝導率は、０．６ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下が好ましいが、０．６ｗ／（ｍ・Ｋ）以下であってもよい。具体的に、例えば絶縁部材６は、高熱伝導性ポリカーボネート、高熱伝導性ポリフェニレンサルファイド、高熱伝導性ナイロンによって形成される。本実施形態の絶縁部材６は、所定の形状に裁断された絶縁性を有するシート状の部材が折り曲げられることによって袋状に形成されている。 The insulating member 6 is arranged between the case 3 (specifically, the case main body 31) and the electrode assembly 2, as shown in FIGS. The insulating member 6 is made of an insulating resin. The thermal conductivity of the insulating member 6 is preferably 0.6 w/(m·K) or more and 30 W/(m·K) or less, but may be 0.6 w/(m·K) or less. Specifically, the insulating member 6 is made of, for example, highly thermally conductive polycarbonate, highly thermally conductive polyphenylene sulfide, or highly thermally conductive nylon. The insulating member 6 of the present embodiment is formed into a bag-like shape by bending a sheet-like member cut into a predetermined shape and having an insulating property.

以上の蓄電素子１によれば、接着層８が外装シート７の全面に配置されていないことで、ケース３の内部の熱が接着層８を介さずにケース３から外装シート７に直接伝わる部分がある。このため、かかる部分において接着層８を介して熱が伝わる部分より熱伝達が効率よく行われる。これにより、蓄電素子１において外装シート７が接着層８によってケース３の外面に配置されていても、接着層８が外装シート７の全面に配置される場合に比べ、内部の熱が外部に放出され易い。 According to the electric storage device 1 described above, since the adhesive layer 8 is not arranged on the entire surface of the exterior sheet 7 , the heat inside the case 3 is directly transferred from the case 3 to the exterior sheet 7 without passing through the adhesive layer 8 . There is Therefore, heat transfer is more efficient in such a portion than in the portion where heat is transferred via the adhesive layer 8 . As a result, even if the exterior sheet 7 is arranged on the outer surface of the case 3 with the adhesive layer 8 in the electric storage element 1, internal heat is released to the outside compared to the case where the adhesive layer 8 is arranged over the entire surface of the exterior sheet 7. easy to be

本実施形態の蓄電素子１では、接着層８（本実施形態の例では第一接着層８１と第二接着層８２との両方）が、ケース３の外面の所定位置であって、集電体５が絶縁部材６を介して該ケース３の内面に当接している位置を避けた所定位置に配置されている（図５参照）。このように、ケース３の外面において集電体５からの熱が伝わりやすい位置を避けた位置に接着層８が配置されることで、集電体５を通じてケース３に伝わった蓄電素子１の内部の熱が接着層８に邪魔されずに外装シート７に伝わり、外部に放出される。 In the electric storage element 1 of the present embodiment, the adhesive layer 8 (both the first adhesive layer 81 and the second adhesive layer 82 in the example of the present embodiment) is a predetermined position on the outer surface of the case 3, and is a current collector. 5 is arranged at a predetermined position avoiding the position where it is in contact with the inner surface of the case 3 via the insulating member 6 (see FIG. 5). In this way, by arranging the adhesive layer 8 on the outer surface of the case 3 at a position that avoids the position where heat from the current collector 5 is likely to be conducted, the inside of the electric storage element 1 that is transferred to the case 3 through the current collector 5 heat is transmitted to the exterior sheet 7 without being hindered by the adhesive layer 8 and released to the outside.

また、本実施形態の蓄電素子１では、接着層８は、ケース３の胴部３１２の厚さ方向において角部の頂部３１５と重ならない位置に配置されている。そして、張力が加わった状態で角部を跨ぐように外装シート７が胴部３１２の外面に配置されることで、角部において外装シート７がケース３（胴部３１２）と確実に接触する。これにより、ケース３から空気層を介して外装シート７に熱が伝わる場合に比べ、内部からケース３に伝わった熱が効率よく外装シート７に伝わる。その結果、蓄電素子１において、前記内部の熱がより外部に放出され易くなる。 In addition, in the electric storage device 1 of the present embodiment, the adhesive layer 8 is arranged at a position that does not overlap with the top portion 315 of the corner portion in the thickness direction of the trunk portion 312 of the case 3 . The exterior sheet 7 is arranged on the outer surface of the trunk portion 312 so as to straddle the corner while being tensioned, so that the exterior sheet 7 reliably contacts the case 3 (body portion 312) at the corner. As a result, the heat transmitted from the inside to the case 3 is efficiently transmitted to the exterior sheet 7 as compared with the case where the heat is transmitted from the case 3 to the exterior sheet 7 via the air layer. As a result, in the electric storage element 1, the internal heat is released to the outside more easily.

また、本実施形態の蓄電素子１では、接着層８は、長壁部３１３の外面に配置されている。このように、角筒状の胴部３１２において外装シート７が周方向に巻き付けられたときにケース３の外面から外装シート７が浮きやすい長壁部３１３の外面（周方向の寸法の大きな外壁面）に接着層８が配置されることで、外装シート７とケース３の外面との間に隙間が生じることが効果的に抑えられる。 Further, in the electric storage device 1 of the present embodiment, the adhesive layer 8 is arranged on the outer surface of the long wall portion 313 . Thus, the outer surface of the long wall portion 313 (outer wall surface having a large circumferential dimension) tends to lift the outer sheet 7 from the outer surface of the case 3 when the outer sheet 7 is wound in the circumferential direction around the rectangular tube-shaped body portion 312 . By arranging the adhesive layer 8 on the outer surface of the case 3 , the formation of a gap between the exterior sheet 7 and the outer surface of the case 3 is effectively suppressed.

また、本実施形態の蓄電素子１では、接着層８が、電極体２の巻回中心軸Ｃ方向における該電極体２の端部（非被覆積層部）２６と、Ｙ軸方向から見て重なる位置に配置されている。電極体２の未塗工部（金属箔２３１、２４１において活物質層２３２、２４２が塗られていない部位：電極体２において集電体５が接続される巻回中心軸Ｃ方向の端部）は、充放電による膨張等によってケース３の内面に接触し難い。このため、ケース３の外面における前記未塗工部と対応する位置に接着層８が配置されることで、ケース３の外面において電極体２からの熱が伝わりやすい位置を避けた位置に接着層８が配置されることになる。これにより、蓄電素子１では、電極体２からケース３に伝わった熱が接着層８に邪魔されずに外装シート７に伝わり、外部に放出される。 In addition, in the electric storage element 1 of the present embodiment, the adhesive layer 8 overlaps the end portion (uncovered laminated portion) 26 of the electrode body 2 in the direction of the winding central axis C of the electrode body 2 when viewed from the Y-axis direction. placed in position. Uncoated portions of the electrode body 2 (portions of the metal foils 231 and 241 not coated with the active material layers 232 and 242: ends of the electrode body 2 in the winding central axis C direction to which the current collector 5 is connected) is difficult to come into contact with the inner surface of the case 3 due to expansion due to charging and discharging. Therefore, by arranging the adhesive layer 8 at a position corresponding to the uncoated portion on the outer surface of the case 3, the adhesive layer is arranged at a position avoiding a position on the outer surface of the case 3 where heat from the electrode body 2 is likely to be conducted. 8 will be placed. As a result, in the electric storage device 1, the heat transmitted from the electrode body 2 to the case 3 is transmitted to the exterior sheet 7 without being hindered by the adhesive layer 8, and released to the outside.

また、胴部３１２における電極体２の塗工部（金属箔２３１、２４１において活物質層２３２、２４２が塗られている部位）とＹ軸方向から見て重なる位置では、充放電による電極体２の膨張によって胴部３１２が膨らむため、胴部３１２と外装シート７とが密接しやすい。このため、かかる位置（即ち、前記塗工部とＹ軸方向から見て重なる位置）に接着層８が配置されないことで、電極体２からケース３に伝わった熱が接着層８に邪魔されずに外装シート７に伝わり易くなる。 In addition, at a position overlapping the coated portion of the electrode body 2 (the portion of the metal foils 231 and 241 where the active material layers 232 and 242 are coated) of the body portion 312 when viewed from the Y-axis direction, the electrode body 2 Since the body portion 312 expands due to the expansion of the body portion 312, the body portion 312 and the exterior sheet 7 are likely to come into close contact with each other. Therefore, since the adhesive layer 8 is not arranged at such a position (that is, a position overlapping the coating portion when viewed from the Y-axis direction), the heat transmitted from the electrode body 2 to the case 3 is not hindered by the adhesive layer 8. It becomes easy to be transmitted to the exterior sheet 7.

本実施形態の蓄電素子１では、外装シート７の熱伝導率が、０．６Ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下が好ましいが、０．６ｗ／（ｍ・Ｋ）以下であってもよい。このような熱伝導率の外装シート７が用いられることで、ケース３から外装シート７に伝わった熱が好適に外部に放出される。また、本実施形態の蓄電素子１では、絶縁部材６の熱伝導率も、０．６Ｗ／（ｍ・Ｋ）以上、且つ、３０Ｗ／（ｍ・Ｋ）以下が好ましいが、０．６ｗ／（ｍ・Ｋ）以下であってもよい。このような絶縁部材６が用いられることで、熱が絶縁部材６を通過し易くなるため、電極体２で生じた熱（即ち、ケース３の内部の熱）がケース３の外部へ放出され易くなる。 In the electric storage device 1 of the present embodiment, the thermal conductivity of the exterior sheet 7 is preferably 0.6 W/(m·K) or more and 30 W/(m·K) or less, but 0.6 w/(m·K) or less. K) may be less than or equal to By using the exterior sheet 7 having such thermal conductivity, the heat transmitted from the case 3 to the exterior sheet 7 is preferably released to the outside. In addition, in the electric storage device 1 of the present embodiment, the thermal conductivity of the insulating member 6 is preferably 0.6 W/(mK) or more and 30 W/(mK) or less, but 0.6 W/(mK) or less. m·K) or less. The use of such an insulating member 6 makes it easier for heat to pass through the insulating member 6, so that the heat generated in the electrode body 2 (that is, the heat inside the case 3) is easily released to the outside of the case 3. Become.

次に、本発明に係る蓄電装置の一実施形態について図６及び図７も参照しつつ説明するが、上述の実施形態と同様の構成には同一符号を用いると共に詳細な説明を省略し、異なる構成についてのみ詳細に説明する。 Next, an embodiment of a power storage device according to the present invention will be described with reference to FIGS. Only the configuration will be described in detail.

蓄電装置１０は、Ｙ軸方向に並ぶ複数の蓄電素子１と、蓄電素子１と隣り合う複数の隣接部材２００と、複数の蓄電素子１と複数の隣接部材２００とをひとまとめに保持する保持部材４００と、を備える。また、蓄電装置１０は、複数の蓄電素子１と保持部材４００との間に配置されるインシュレータ５００と、蓄電素子１の外部端子４に接続される複数のバスバ６００と、を備える。 The power storage device 10 includes a plurality of power storage elements 1 arranged in the Y-axis direction, a plurality of adjacent members 200 adjacent to the power storage elements 1, and a holding member 400 that collectively holds the plurality of power storage elements 1 and the plurality of adjacent members 200. And prepare. The power storage device 10 also includes an insulator 500 arranged between the plurality of power storage elements 1 and the holding member 400 , and a plurality of bus bars 600 connected to the external terminals 4 of the power storage elements 1 .

複数の蓄電素子１のそれぞれでは、上記の実施形態と同様に、外装シート７が、ケース３の外面と接着層８を介して対向する部分と、ケース３の外面と直接対向する部分と、を有している。 In each of the plurality of power storage elements 1, the exterior sheet 7 has a portion that faces the outer surface of the case 3 via the adhesive layer 8 and a portion that directly faces the outer surface of the case 3, as in the above embodiment. have.

隣接部材２００は、Ｘ軸方向に並ぶ蓄電素子１の間、又は蓄電素子１と該蓄電素子１に対してＹ軸方向に並ぶ部材（本実施形態の例では、保持部材４００の一部）との間に配置される。この隣接部材２００は、複数種の隣接部材を含む。本実施形態の隣接部材２００は、蓄電装置１０のＹ軸方向の途中位置に配置される蓄電素子１と隣り合う第一隣接部材（隣接部材）２１０と、Ｙ軸方向に並ぶ複数の蓄電素子１のうちの最も端にある蓄電素子１と隣り合う第二隣接部材２２０と、を有する。 The adjacent member 200 is between the energy storage elements 1 aligned in the X-axis direction, or between the energy storage elements 1 and a member aligned in the Y-axis direction with respect to the energy storage elements 1 (part of the holding member 400 in the example of this embodiment). is placed between This adjacent member 200 includes multiple types of adjacent members. The adjacent member 200 of the present embodiment includes a first adjacent member (adjacent member) 210 adjacent to the energy storage element 1 arranged in the middle of the power storage device 10 in the Y-axis direction, and a plurality of energy storage elements 1 arranged in the Y-axis direction. and a second adjacent member 220 that is adjacent to the storage element 1 at the end of them.

第一隣接部材２１０は、蓄電装置１０のＹ軸方向の途中位置において、Ｙ軸方向に隣り合う蓄電素子１の間に配置される。これにより、第一隣接部材２１０を介してＹ軸方向に並ぶ蓄電素子１の間に、所定の間隔（沿面距離等）が確保される。 The first adjacent member 210 is arranged between the energy storage elements 1 adjacent to each other in the Y-axis direction at a midway position of the energy storage device 10 in the Y-axis direction. As a result, a predetermined interval (creeping distance, etc.) is ensured between the storage elements 1 arranged in the Y-axis direction via the first adjacent member 210 .

具体的に、第一隣接部材２１０は、蓄電素子１（ケース本体３１）と隣り合う第一本体部２１１と、第一本体部２１１と隣り合う蓄電素子１の該第一本体部２１１に対する移動を規制する第一規制部２１２と、を有する。 Specifically, the first adjacent member 210 is configured to move the first body portion 211 adjacent to the storage element 1 (case body 31 ) and the movement of the storage element 1 adjacent to the first body portion 211 with respect to the first body portion 211 . and a first regulation portion 212 for regulation.

第一本体部２１１の輪郭は、Ｙ軸方向から見て隣り合う蓄電素子１（ケース３）の輪郭に対応する矩形である。また、第一本体部２１１は、Ｙ軸方向に隣り合う蓄電素子１との間に温度調整用の流体（本実施形態の例では空気）を通過させる通風路２１５を形成する。詳しくは、第一本体部２１１は、矩形波形の断面形状を有する。これにより、第一本体部２１１が隣り合う蓄電素子１と当接することで、該蓄電素子１との間に通風路２１５が形成される。 The outline of the first main body portion 211 is a rectangle corresponding to the outline of the adjacent storage element 1 (case 3) when viewed in the Y-axis direction. In addition, the first main body portion 211 forms a ventilation passage 215 through which a fluid for temperature adjustment (air in the example of the present embodiment) passes between the storage elements 1 adjacent in the Y-axis direction. Specifically, the first main body portion 211 has a rectangular waveform cross-sectional shape. As a result, the first main body portion 211 abuts on the adjacent storage element 1 , thereby forming a ventilation passage 215 between the storage element 1 and the storage element 1 .

第一規制部２１２は、第一本体部２１１からＹ軸方向に延び、第一本体部２１１と隣り合う蓄電素子１（詳しくはケース３）とＸ－Ｚ面方向の外側から当接することによって該蓄電素子１の第一本体部２１１に対するＸ－Ｚ面方向への相対移動を規制する。この第一規制部２１２は、第一本体部２１１の少なくとも各角部からＹ軸方向に延び、第一本体部２１１と隣り合う蓄電素子１（ケース３）の角部にＸ－Ｚ面方向の外側から当接する。 The first restricting portion 212 extends from the first main body portion 211 in the Y-axis direction, and contacts the storage element 1 (specifically, the case 3) adjacent to the first main body portion 211 from the outside in the XZ plane direction. It restricts the relative movement of the storage element 1 with respect to the first body portion 211 in the XZ plane direction. The first restricting portion 212 extends in the Y-axis direction from at least each corner of the first main body portion 211, and extends in the XZ plane direction at the corner of the storage element 1 (case 3) adjacent to the first main body portion 211. Abut from the outside.

第二隣接部材２２０は、Ｙ軸方向において蓄電素子１と保持部材４００との間に配置される。これにより、第二隣接部材２２０を介してＹ軸方向に並ぶ蓄電素子１と保持部材４００との間に、所定の間隔（沿面距離等）が確保される。 The second adjacent member 220 is arranged between the storage element 1 and the holding member 400 in the Y-axis direction. As a result, a predetermined gap (e.g. creepage distance) is secured between the storage element 1 and the holding member 400 which are arranged in the Y-axis direction via the second adjacent member 220 .

具体的に、第二隣接部材２２０は、蓄電素子１と保持部材４００との間において該蓄電素子１（ケース本体３１）と隣り合う第二本体部２２１と、第二本体部２２１と隣り合う蓄電素子１の該第二本体部２２１に対する移動を規制する第二規制部２２２と、を有する。 Specifically, the second adjacent member 220 includes a second body portion 221 adjacent to the storage element 1 (case body 31) between the storage element 1 and the holding member 400, and a storage body portion 221 adjacent to the second body portion 221. and a second restricting portion 222 that restricts movement of the element 1 with respect to the second body portion 221 .

第二本体部２２１の輪郭は、Ｙ軸方向から見て隣り合う蓄電素子１（ケース３）の輪郭に対応する矩形である。また、第二本体部２２１は、Ｙ軸方向に隣り合う蓄電素子１との間に温度調整用の流体（本実施形態の例では空気）を通過させる通風路２２５を形成する。詳しくは、第二本体部２２１では、隣り合う蓄電素子１に向けて（Ｙ軸方向に）突出すると共にＸ軸方向に延びる複数の凸部２２６が、Ｚ軸方向に間隔をあけて並ぶ。これにより、凸部２２６の先端（突出方向の先端）が隣り合う蓄電素子１と当接することで、第二隣接部材２２０と蓄電素子１との間に通風路２２５が形成される。 The outline of the second body portion 221 is a rectangle corresponding to the outline of the adjacent storage element 1 (case 3) when viewed from the Y-axis direction. In addition, the second body portion 221 forms a ventilation passage 225 for passing a fluid for temperature adjustment (air in the example of the present embodiment) between the storage elements 1 adjacent in the Y-axis direction. Specifically, in the second main body portion 221, a plurality of convex portions 226 that protrude toward adjacent power storage elements 1 (in the Y-axis direction) and extend in the X-axis direction are arranged at intervals in the Z-axis direction. As a result, the tip of the protrusion 226 (the tip in the projecting direction) abuts against the adjacent power storage element 1 , thereby forming the ventilation path 225 between the second adjacent member 220 and the power storage element 1 .

第二規制部２２２は、第二本体部２２１からＹ軸方向に延び、第二本体部２２１と隣り合う蓄電素子１（詳しくはケース３）とＸ－Ｚ面方向の外側から当接することによって該蓄電素子１の第二本体部２２１に対するＸ－Ｚ面方向への相対移動を規制する。この第二規制部２２２は、第二本体部２２１の少なくとも各角部からＹ軸方向に延び、第二本体部２２１と隣り合う蓄電素子１（ケース３）の角部にＸ－Ｚ面方向の外側から当接する。 The second restricting portion 222 extends from the second main body portion 221 in the Y-axis direction, and contacts the storage element 1 (specifically, the case 3) adjacent to the second main body portion 221 from the outside in the XZ plane direction. It restricts the relative movement of the storage element 1 with respect to the second body portion 221 in the XZ plane direction. The second restricting portion 222 extends in the Y-axis direction from at least each corner of the second main body portion 221, and extends in the XZ plane direction at the corner of the storage element 1 (case 3) adjacent to the second main body portion 221. Abut from the outside.

保持部材４００は、複数の蓄電素子１と複数の隣接部材２００との周囲を囲むことで、これら複数の蓄電素子１と複数の隣接部材２００とをひとまとめに保持する。この保持部材４００は、金属等の導電性を有する部材によって構成される。具体的に、保持部材４００は、Ｙ軸方向において複数の蓄電素子１が間に位置するように配置される一対の終端部材４１０と、複数の蓄電素子１とＸ軸方向に対向した状態で一対の終端部材４１０同士を接続する対向部材４２０と、を備える。本実施形態の蓄電装置１０では、一対の終端部材４１０が、Ｙ軸方向の端に配置された蓄電素子１との間に第二隣接部材２２０を挟み込んだ状態で配置される。また、一対の対向部材４２０がＹ軸方向に並ぶ複数の蓄電素子１のＸ軸方向の両側に配置される。 The holding member 400 surrounds the plurality of power storage elements 1 and the plurality of adjacent members 200 to collectively hold the plurality of power storage elements 1 and the plurality of adjacent members 200 . The holding member 400 is made of a conductive member such as metal. Specifically, the holding member 400 includes a pair of terminal members 410 arranged so that the plurality of storage elements 1 are positioned between them in the Y-axis direction, and a pair of end members 410 facing the plurality of storage elements 1 in the X-axis direction. and a facing member 420 that connects the terminal members 410 of each other. In the power storage device 10 of the present embodiment, the pair of end members 410 are arranged with the second adjacent member 220 sandwiched between the pair of end members 410 and the power storage elements 1 arranged at the ends in the Y-axis direction. A pair of opposing members 420 are arranged on both sides in the X-axis direction of the plurality of power storage elements 1 arranged in the Y-axis direction.

一対の終端部材４１０のそれぞれは、Ｘ－Ｚ面方向に広がる。具体的に、一対の終端部材４１０のそれぞれは、蓄電素子１と対応する輪郭（本実施形態では矩形状の輪郭）を有する本体４１１と、本体４１１から第二隣接部材２２０の第二本体部２２１に向けて突出し且つ該第二隣接部材２２０に当接する圧接部４１２と、を有する。 Each of the pair of termination members 410 extends in the XZ plane. Specifically, each of the pair of end members 410 includes a main body 411 having a contour (rectangular contour in this embodiment) corresponding to the energy storage device 1, and a second main body portion 221 extending from the main body 411 to the second adjacent member 220. and a pressure contact portion 412 that protrudes toward and contacts the second adjacent member 220 .

一対の対向部材４２０のそれぞれは、Ｙ軸方向に延び且つＺ軸方向に間隔をあけて配置される一対の梁部４２１と、一対の梁部４２１の端部同士を連結する一対の第一連結部４２２と、Ｙ軸方向における途中位置（本実施形態の例では、Ｙ軸方向に並ぶ複数の蓄電素子１のうちの途中位置に配置された蓄電素子１とＸ軸方向から見て重なる位置）において一対の梁部４２１同士を連結する第二連結部４２３と、を有する。 Each of the pair of opposing members 420 includes a pair of beams 421 extending in the Y-axis direction and arranged with a gap in the Z-axis direction, and a pair of first couplings connecting the ends of the pair of beams 421 . part 422 and a midway position in the Y-axis direction (in the example of the present embodiment, a position overlapping a power storage element 1 arranged in a midway position among the plurality of power storage elements 1 arranged in the Y-axis direction when viewed from the X-axis direction). and a second connecting portion 423 that connects the pair of beam portions 421 to each other.

一対の梁部４２１のそれぞれは、Ｙ軸方向に並ぶ複数の蓄電素子１（ケース３）の各角部に沿って延びる。第一連結部４２２は、Ｚ軸方向に延び、終端部材４１０と連結される。これにより、終端部材４１０と対向部材４２０とが接続（連結）される。第二連結部４２３は、Ｙ軸方向において蓄電素子１と重なる位置においてＺ軸方向に延びる。 Each of the pair of beams 421 extends along each corner of the plurality of power storage elements 1 (case 3) aligned in the Y-axis direction. The first connecting portion 422 extends in the Z-axis direction and is connected to the terminal member 410 . Thereby, the terminating member 410 and the opposing member 420 are connected (coupled). The second connecting portion 423 extends in the Z-axis direction at a position overlapping the power storage element 1 in the Y-axis direction.

インシュレータ５００は、絶縁性を有する。このインシュレータ５００は、対向部材４２０と、Ｙ軸方向に並ぶ複数の蓄電素子１と、の間に配置される。具体的に、インシュレータ５００は、保持部材４００における少なくとも複数の蓄電素子１と対向する領域を覆う。これにより、インシュレータ５００は、保持部材４００と、Ｙ軸方向に並ぶ複数の蓄電素子１と、の間を絶縁する。 Insulator 500 has insulating properties. This insulator 500 is arranged between the facing member 420 and the plurality of power storage elements 1 arranged in the Y-axis direction. Specifically, the insulator 500 covers at least a region of the holding member 400 facing the plurality of power storage elements 1 . Thereby, the insulator 500 insulates between the holding member 400 and the plurality of power storage elements 1 arranged in the Y-axis direction.

バスバ６００は、金属等の導電性を有する板状の部材によって構成され、蓄電素子１の外部端子４同士を導通させる。バスバ６００は、蓄電装置１０において複数（複数の蓄電素子１と対応する数）設けられる。本実施形態の複数のバスバ６００は、蓄電装置１０に含まれる複数の蓄電素子１の全てを直列に接続する（導通させる）。 The bus bar 600 is made of a conductive plate-like member such as metal, and electrically connects the external terminals 4 of the storage elements 1 to each other. A plurality of busbars 600 (a number corresponding to the plurality of storage elements 1) are provided in the power storage device 10 . The plurality of busbars 600 of the present embodiment connect (make conductive) all of the plurality of power storage elements 1 included in the power storage device 10 in series.

以上の蓄電装置１０によれば、保持部材４００によって保持されていることで、蓄電素子１のそれぞれにＹ軸方向の力が加わる。このため、蓄電装置１０では、Ｙ軸方向において外装シート７とケース３の外面とが直接対向する部分７２を有する外装シート７を備えた蓄電素子１において、Ｙ軸方向に加わる力によって外装シート７とケース３とが密着する。これにより、該蓄電素子１においてケース３から外装シート７への熱伝達が好適に行われる。その結果、複数の蓄電素子１を備える蓄電装置１０において、外装シート７が接着層８によってケース３の外面に配置されている蓄電素子１を含んでいても、該蓄電素子１において内部の熱が外部に放出され易い。 According to the power storage device 10 described above, a force in the Y-axis direction is applied to each of the power storage elements 1 by being held by the holding member 400 . Therefore, in the power storage device 10, the power storage element 1 including the exterior sheet 7 having the portion 72 where the exterior sheet 7 and the outer surface of the case 3 directly face each other in the Y-axis direction causes the exterior sheet 7 to collapse due to the force applied in the Y-axis direction. and the case 3 are in close contact with each other. As a result, the heat transfer from the case 3 to the outer sheet 7 is favorably performed in the electric storage element 1 . As a result, in the power storage device 10 having a plurality of power storage elements 1 , even if the exterior sheet 7 includes the power storage elements 1 arranged on the outer surface of the case 3 with the adhesive layer 8 , the heat inside the power storage elements 1 is It is easily released to the outside.

尚、本発明の蓄電素子１及び蓄電装置１０は、上述の各実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。 The storage element 1 and the storage device 10 of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, some of the configurations of certain embodiments can be deleted.

上記実施形態の蓄電素子１では、外装シート７は、胴部３１２を全周に亘って連続して囲っているが、この構成に限定されない。複数の外装シート７によって、胴部３１２を囲うように覆う構成であってもよい。即ち、各外装シート７が、長壁部３１３のみや、短壁部３１４のみ等のケース３の一部を覆う形状であってもよい。この場合でも、各外装シート７は、ケース３の外面と接着層８を介して対向する部分７１と、ケース３の外面と直接対向する部分７２と、を有する。 In the electric storage device 1 of the above embodiment, the exterior sheet 7 continuously surrounds the body portion 312 over the entire circumference, but the configuration is not limited to this. A plurality of exterior sheets 7 may be configured to cover the body portion 312 so as to surround it. That is, each exterior sheet 7 may have a shape that covers a part of the case 3 such as only the long wall portion 313 or only the short wall portion 314 . Even in this case, each exterior sheet 7 has a portion 71 facing the outer surface of the case 3 via the adhesive layer 8 and a portion 72 directly facing the outer surface of the case 3 .

上記実施形態の蓄電素子１では、外装シート７の厚さ方向において第一接着層８１と第二接着層８２とが重なっているが、この構成に限定されない。第一接着層８１と第二接着層８２とが互いに重ならない位置にそれぞれ配置されてもよい。 In the electric storage device 1 of the above embodiment, the first adhesive layer 81 and the second adhesive layer 82 overlap in the thickness direction of the exterior sheet 7, but the configuration is not limited to this. The first adhesive layer 81 and the second adhesive layer 82 may be arranged at positions that do not overlap each other.

また、上記実施形態の蓄電素子１では、外装シート７の長手方向の端部のみに接着層８が配置されているが、他の部位に接着層８が配置されてもよい。即ち、外装シート７の全面に接着層８が配置されていなければよい。 In addition, in the electric storage device 1 of the above-described embodiment, the adhesive layer 8 is arranged only at the ends of the exterior sheet 7 in the longitudinal direction, but the adhesive layer 8 may be arranged at another portion. That is, it is sufficient that the adhesive layer 8 is not arranged on the entire surface of the exterior sheet 7 .

また、上記実施形態の蓄電素子１では、外装シート７の少なくとも一部（上記実施形態の例では、長手方向の一方の端部）がケース３に接着層８（詳しくは、第一接着層８１）を介して固定されているが、この構成に限定されない。例えば、図８に示すように、外装シート７が胴部３１２を周方向に囲い且つ周方向における外装シート７の一方の端部と他方の端部とが積層された状態で互いに接着層８によって接着された構成であってもよい。即ち、外装シート７とケース３とが、接着層８によって接着されていない構成でもよい。このとき、外装シート７には、周方向の張力が加わった状態で、胴部３１２に巻き付けられている。 In addition, in the electric storage device 1 of the above embodiment, at least part of the exterior sheet 7 (in the example of the above embodiment, one end in the longitudinal direction) is attached to the case 3 by the adhesive layer 8 (specifically, the first adhesive layer 81). ), but is not limited to this configuration. For example, as shown in FIG. 8 , the exterior sheet 7 surrounds the body portion 312 in the circumferential direction, and one end and the other end of the exterior sheet 7 in the circumferential direction are laminated together by the adhesive layer 8 . It may also be a glued configuration. That is, the exterior sheet 7 and the case 3 may be configured so that they are not bonded together by the adhesive layer 8 . At this time, the exterior sheet 7 is wound around the trunk portion 312 while tension is applied in the circumferential direction.

この場合、接着層８を介して積層された前記一方の端部及び前記他方の端部は、胴部３１２の角部における頂部３１５と重ならない位置に配位置されることが好ましい。また、接着層８を介して積層された前記一方の端部及び前記他方の端部は、電極体２の非被覆積層部２６（未塗工部）とＹ軸方向から見て重なる位置に配置されることがより好ましい。 In this case, the one end portion and the other end portion laminated via the adhesive layer 8 are preferably arranged at a position not overlapping the top portion 315 at the corner portion of the trunk portion 312 . In addition, the one end and the other end laminated via the adhesive layer 8 are arranged at positions overlapping the non-coated laminated portion 26 (uncoated portion) of the electrode body 2 when viewed from the Y-axis direction. more preferably.

かかる構成によれば、張力によって外装シート７がケース３（胴部３１２）の角部（詳しくは、頂部３１５）と確実に接触するため、この位置（角部の頂部３１５）を避けた位置に、ケース３から伝わった熱を外部に放出し難い外装シート７における厚さ寸法の大きくなった部位（接着層８を介して端部同士が積層された部位）を配置することで、外装シート７が接着層８によってケース３の外面に配置されていても蓄電素子１の内部の熱を外部に放出させ易い。 According to such a configuration, the exterior sheet 7 is reliably brought into contact with the corner (specifically, the top 315) of the case 3 (body 312) due to the tension. By arranging a portion of the exterior sheet 7 having a large thickness dimension (a portion where the ends are laminated via the adhesive layer 8) in the exterior sheet 7 that is difficult to release the heat transmitted from the case 3 to the outside, the exterior sheet 7 is arranged on the outer surface of the case 3 by the adhesive layer 8, the heat inside the electric storage element 1 can be easily released to the outside.

また、上記実施形態の蓄電素子１における集電体５では、第二部位（電極体２に接続される部位）５２が巻回中心軸Ｃ方向から電極体２（詳しくは、非被覆積層部２６）に当接するように配置されているが、この構成に限定されない。例えば図９に示すように、集電体５が、Ｙ軸方向に間隔をあけた一対の第二部位５２Ａを有し、これら一対の第二部位５２Ａが電極体２の非被覆積層部２６をＹ軸方向に挟み込むように接続されてもよい。この場合も、上記実施形態の蓄電素子１と同様に、接着層８は、集電体５が絶縁部材６を介して胴部３１２の内面に当接している位置を避けた位置に配置される。例えば具体的には、図１０に示すように、接着層８は、外装シート７における短壁部３１４と対向する位置に配置される。 In addition, in the current collector 5 in the storage element 1 of the above embodiment, the second portion (the portion connected to the electrode body 2) 52 extends from the winding center axis C direction to the electrode body 2 (specifically, the uncoated laminated portion 26). ), but is not limited to this configuration. For example, as shown in FIG. 9, the current collector 5 has a pair of second portions 52A spaced apart in the Y-axis direction, and the pair of second portions 52A cover the uncovered laminated portion 26 of the electrode body 2. It may be connected so as to be sandwiched in the Y-axis direction. Also in this case, similarly to the electric storage element 1 of the above embodiment, the adhesive layer 8 is arranged at a position avoiding the position where the current collector 5 is in contact with the inner surface of the body portion 312 via the insulating member 6. . Specifically, for example, as shown in FIG. 10 , the adhesive layer 8 is arranged at a position facing the short wall portion 314 in the exterior sheet 7 .

また、図１１に示すように、集電体５が一つの第二部位５２Ｂを有し、この第二部位５２ＢがＹ軸方向の一方側のみから電極体２の非被覆積層部２６に接続される構成でもよい。この場合も、接着層８は、集電体５が絶縁部材６を介して胴部３１２の内面に当接している位置を避けた位置に配置される。例えば具体的には、図１２に示すように、接着層８Ａは、外装シート７において、Ｙ軸方向の他方側の長壁部３１３における非被覆積層部２６と重なる領域と対向する位置に配置に配置される。また、接着層８Ｂは、短壁部３１４と対向する位置に配置されてもよい。 Further, as shown in FIG. 11, the current collector 5 has one second portion 52B, and this second portion 52B is connected to the uncoated laminated portion 26 of the electrode body 2 from only one side in the Y-axis direction. It may be a configuration that Also in this case, the adhesive layer 8 is arranged at a position avoiding the position where the current collector 5 is in contact with the inner surface of the body portion 312 with the insulating member 6 interposed therebetween. Specifically, for example, as shown in FIG. 12, the adhesive layer 8A is arranged in the exterior sheet 7 at a position facing the region of the long wall portion 313 on the other side in the Y-axis direction that overlaps the uncovered laminated portion 26. be done. Also, the adhesive layer 8B may be arranged at a position facing the short wall portion 314 .

上記実施形態の電極体２は、長尺な電極（正極２３及び負極２４）が巻回された、いわゆる巻回型であるが、この構成に限定されない。例えば図１３に示すように、電極体２Ａは、枚葉状または短冊状の電極（正極及び負極）が積層された、いわゆる積層型でもよい。この場合、例えば図１４に示すように、接着層８は、外装シート７における短壁部３１４と対向する位置に配置される。これは、短壁部３１４が胴部３１２において内部からの熱が伝わり難い部位であるため、この位置に接着層８が配置されることで、内部からの熱が伝わりやすい長壁部３１３と対向する位置に接着層８が配置されることによって長壁部３１３を通じたケース３内部の熱の外部への放熱性が低下する場合に比べ、蓄電素子１の放熱性の低下が抑えられるからである。詳しくは、以下の通りである。 The electrode body 2 of the above embodiment is a so-called wound type in which long electrodes (positive electrode 23 and negative electrode 24) are wound, but is not limited to this configuration. For example, as shown in FIG. 13, the electrode body 2A may be a so-called laminated type in which leaf-shaped or strip-shaped electrodes (positive electrode and negative electrode) are laminated. In this case, for example, as shown in FIG. 14, the adhesive layer 8 is arranged at a position facing the short wall portion 314 of the exterior sheet 7 . This is because the short wall portion 314 is a portion of the trunk portion 312 to which heat from the inside is difficult to be conducted, so that the adhesive layer 8 is arranged at this position so that it faces the long wall portion 313 to which heat is easily conducted from the inside. This is because the deterioration of the heat dissipation of the electric storage element 1 can be suppressed compared to the case where the heat dissipation of the heat inside the case 3 through the long wall portion 313 is lowered by arranging the adhesive layer 8 at the position. Details are as follows.

積層型の電極体２Ａの場合、通常、電極体２ＡのＸ軸方向の端部では、正極と負極との絶縁を図るために、セパレータの端部が正極の端縁及び負極の端縁から突出している。このため、電極体２Ａがケース３内に収容される際に電極体２Ａがケース本体３１に押し込まれる（圧入される）ことで、このセパレータの突出している部位が折れ曲がったり複数重なったりした状態となる。即ち、電極体２Ａの電極とケース３の短壁部３１４との間に折れ曲がったり複数重なったりしたセパレータが位置した状態となっている。これにより、胴部３１２において、短壁部３１４は、長壁部３１３よりも内部からの熱（電極体２Ａ（電極）で生じた熱等）が伝わり難くなっている。しかも、この蓄電素子１では、電極体２Ａがケース３内に収納される際のガイドとしても使用されるサイドスペーサ９が短壁部３１４と電極体２Ａとの間に配置されているため、内部の熱が短壁部３１４へ、より伝わり難くなっている。よって、この内部からの熱が伝わり難くなっている短壁部３１４と対向する位置に接着層８が配置されることで、上述のように、内部からの熱が伝わりやすい長壁部３１３と対向する位置に接着層８が配置されることによって長壁部３１３を通じたケース３内部の熱の外部への放熱性が低下する場合に比べ、蓄電素子１の放熱性の低下が抑えられる。即ち、この蓄電素子１では、放熱性の高い位置に接着層８を配置せずに、放熱性の低い位置に接着層８を配置することによって、蓄電素子１全体としての放熱性の低下が抑えられる。 In the case of the laminated electrode body 2A, generally, at the ends of the electrode body 2A in the X-axis direction, the ends of the separator protrude from the edges of the positive and negative electrodes in order to insulate the positive and negative electrodes. ing. Therefore, when the electrode assembly 2A is housed in the case 3, the electrode assembly 2A is pushed (press-fitted) into the case main body 31, causing the protruding portions of the separator to bend or overlap. Become. In other words, a bent or multiple separator is positioned between the electrode of the electrode body 2A and the short wall portion 314 of the case 3 . As a result, in the body portion 312 , the short wall portion 314 is less likely to transmit heat from the inside (such as heat generated in the electrode assembly 2</b>A (electrode)) than the long wall portion 313 . Moreover, in this electric storage element 1, the side spacer 9, which is also used as a guide when the electrode body 2A is accommodated in the case 3, is disposed between the short wall portion 314 and the electrode body 2A. heat is more difficult to be transmitted to the short wall portion 314 . Therefore, by arranging the adhesive layer 8 at a position facing the short wall portion 314 to which heat from the inside is difficult to be conducted, as described above, the adhesive layer 8 faces the long wall portion 313 to which heat is easily conducted from the inside. By arranging the adhesive layer 8 at the position, the deterioration of the heat dissipation of the electric storage element 1 is suppressed compared to the case where the heat dissipation of the heat inside the case 3 through the long wall portion 313 is lowered. That is, in the electric storage element 1, by arranging the adhesive layer 8 at a position with low heat dissipation rather than at a position with high heat dissipation, deterioration in the heat dissipation of the electric storage element 1 as a whole is suppressed. be done.

ここで、図１３に示すサイドスペーサ９は、絶縁性を有し、樹脂によって形成されている。このサイドスペーサ９は、Ｚ軸方向から見て略円弧状であり、電極体２をＸ軸方向から挟み込むように一対配置されている。この一対のサイドスペーサ９は、ケース本体３１に電極体２Ａが挿入（圧入）される際に、ガイドとして働き、ケース３内に電極体２Ａが収納された状態では、ケース３内での電極体２Ａの動き（位置ズレ等）を規制する。尚、積層型の電極体２Ａを備えた蓄電素子１は、サイドスペーサ９を備えない構成でもよい。 Here, the side spacers 9 shown in FIG. 13 have insulating properties and are made of resin. The side spacers 9 are substantially arc-shaped when viewed from the Z-axis direction, and are arranged in pairs so as to sandwich the electrode body 2 from the X-axis direction. The pair of side spacers 9 serve as guides when the electrode body 2A is inserted (press-fitted) into the case body 31, and when the electrode body 2A is accommodated in the case 3, the electrode body 2A is positioned within the case 3. Restrict the movement of 2A (displacement, etc.). Note that the electric storage element 1 including the laminated electrode body 2A may be configured without the side spacers 9 .

上記実施形態の蓄電装置１０では、温度調整用の流体（例えば、空気）が蓄電素子１と隣接部材２００との間に形成される通風路２１５、２２５を通過することで蓄電素子１の温度調整が行われるが、この構成に限定されない。例えば図１５に示すように、蓄電装置１０Ａは、Ｘ軸方向に並ぶ複数の蓄電素子１に沿って配置され、該複数の蓄電素子１を冷却する冷却部材７０を備えていてもよい。この冷却部材７０は、例えばヒートシンクである。そして、この冷却部材７０がＸ軸方向に並ぶ蓄電素子１と接していることで、各蓄電素子１の温度が調整される。図１５に示す例では、冷却部材７０は、水冷式のヒートシンクである。この蓄電装置１０Ａでは、上記実施形態の蓄電装置１０のように隣り合う蓄電素子１同士の間に通風路がなくても各蓄電素子１の温度調整が可能であるため、隣接部材が蓄電素子１間に配置されていない。即ち、蓄電装置１０Ａの各蓄電素子１では、隣接する蓄電素子１間の絶縁が外装シート７Ａによって図られている。尚、冷却部材７０を備える蓄電装置１０Ａにおいても、隣り合う蓄電素子１間に隣接部材２００が配置され、通風路２１５、２２５が形成されていてもよい。 In the power storage device 10 of the above-described embodiment, the fluid for temperature adjustment (for example, air) passes through the ventilation paths 215 and 225 formed between the power storage element 1 and the adjacent member 200, thereby adjusting the temperature of the power storage element 1. is performed, but is not limited to this configuration. For example, as shown in FIG. 15 , the power storage device 10A may include a cooling member 70 arranged along the plurality of power storage elements 1 arranged in the X-axis direction and cooling the plurality of power storage elements 1 . This cooling member 70 is, for example, a heat sink. Since the cooling member 70 is in contact with the storage elements 1 arranged in the X-axis direction, the temperature of each storage element 1 is adjusted. In the example shown in FIG. 15, the cooling member 70 is a water-cooled heat sink. In this power storage device 10A, the temperature of each power storage device 1 can be adjusted without a ventilation path between adjacent power storage devices 1 as in the power storage device 10 of the above-described embodiment. not placed in between. That is, in each storage element 1 of the storage device 10A, insulation between adjacent storage elements 1 is achieved by the outer sheet 7A. Incidentally, in the power storage device 10A including the cooling member 70 as well, the adjacent member 200 may be arranged between the adjacent power storage elements 1 to form the ventilation paths 215 and 225 .

図１６に示すように、蓄電装置１０Ａの各蓄電素子１における外装シート７Ａでは、接着層８が、ケース３の外面における冷却部材７０によって冷却される領域以外の領域と対向する位置に配置される。また、この外装シート７Ａは、ケース３の閉塞部３１１も覆うことにより、各蓄電素子１と冷却部材７０との間を絶縁している。 As shown in FIG. 16, in the exterior sheet 7A of each power storage element 1 of the power storage device 10A, the adhesive layer 8 is arranged at a position facing the region other than the region cooled by the cooling member 70 on the outer surface of the case 3. . In addition, the exterior sheet 7A also covers the closed portion 311 of the case 3, thereby insulating each storage element 1 and the cooling member 70 from each other.

具体的に、外装シート７Ａは、ケース３の閉塞部３１１と対応する矩形状の第一部位７１Ａと、第一部位７１Ａの一対の長辺のそれぞれから延び且つケース３の長壁部３１３と対応する矩形状の一対の第二部位７２Ａと、第一部位７１Ａの一対の短辺のそれぞれから延びる一対の第三部位７３Ａと、を有する。第三部位７３Ａは、短壁部３１４と対応する矩形状の本体７３１Ａと、本体７３１Ａの一対の長辺のそれぞれから延びる矩形状の延設部７３２Ａと、を有する。第一部７１Ａは、閉塞部３１１を覆い、一対の第二部位７２Ａのそれぞれは、長壁部３１３を覆い、一対の第三部位７３Ａの本体７３１Ａのそれぞれは、短壁部３１４を覆う。また、第三部位７３Ａの一対の延設部７３２Ａのそれぞれは、本体７３１Ａから延びて長壁部３１３の一部（Ｘ軸方向の端部）を覆うことにより、第二部位７２Ａと本体７３１Ａとの間（長壁部３１３と短壁部３１４との角部の位置）に外装シートの隙間が生じることが防がれる。 Specifically, the exterior sheet 7A extends from a rectangular first portion 71A corresponding to the closing portion 311 of the case 3 and a pair of long sides of the first portion 71A and corresponding to the long wall portions 313 of the case 3 . It has a pair of rectangular second portions 72A and a pair of third portions 73A extending from each of the pair of short sides of the first portion 71A. The third portion 73A has a rectangular main body 731A corresponding to the short wall portion 314, and rectangular extensions 732A extending from each of the pair of long sides of the main body 731A. The first portion 71A covers the closing portion 311, each of the pair of second portions 72A covers the long wall portion 313, and each of the main bodies 731A of the pair of third portions 73A covers the short wall portion 314. Moreover, each of the pair of extension portions 732A of the third portion 73A extends from the main body 731A and covers a part (the end portion in the X-axis direction) of the long wall portion 313, so that the second portion 72A and the main body 731A are separated from each other. It is possible to prevent a gap between the exterior sheets from being formed between them (the position of the corner between the long wall portion 313 and the short wall portion 314).

以上の外装シート７Ａにおいて、接着層８は、第二部位７２Ａの先端部と第三部位７３Ａの先端部とに配置されている。即ち、接着層８は、外装シート７Ａにおいて、長壁部３１３及び短壁部３１４の端部（ケース本体３１の胴部３１２における開口側の端部）と対向する位置に配置されている。このように、冷却部材７０によって冷却される閉塞部３１１以外の位置に接着層８が配置されることで、冷却部材７０による蓄電素子１の冷却効率の低下が防がれる。しかも、胴部３１２の開口側（蓋板３２側）の端部の内側には、通常、外部端子４と集電体５との接続部等が配置されているため、ケース３内の他の領域（電極体２が収容されている領域）に比べて空間（隙間）が多く、且つ、ケース３内に配置された部材（集電体５等）とケース３の内面との接触部位が少なく（接触面積が小さく）、これにより、前記開口側の端部は、胴部３１２において電極体２等で生じた熱の伝わり難い部位（即ち、冷却部材７０等によって冷却してもケース３の内部が冷却され難い部位）となっている。従って、この胴部３１２の開口側の端部位置に接着層８が配置されることで、内部からの熱が伝わりやすい胴部３１２の他の領域（部位）と対向する位置に接着層８が配置されることによって胴部３１２の前記他の領域を通じたケース３内部の冷却効率が低下する場合に比べ、蓄電素子１の冷却効率の低下が抑えられる。 In the exterior sheet 7A described above, the adhesive layer 8 is arranged at the tip of the second portion 72A and the tip of the third portion 73A. That is, the adhesive layer 8 is arranged in the exterior sheet 7A at a position facing the end portions of the long wall portion 313 and the short wall portion 314 (end portions on the opening side of the trunk portion 312 of the case body 31). By arranging the adhesive layer 8 at a position other than the closed portion 311 cooled by the cooling member 70 in this way, the cooling efficiency of the power storage element 1 by the cooling member 70 is prevented from decreasing. Moreover, since the connecting portion between the external terminal 4 and the current collector 5 is normally arranged inside the end portion on the opening side (cover plate 32 side) of the body portion 312 , other parts in the case 3 There is more space (gap) than the area (the area where the electrode body 2 is accommodated), and the contact portion between the members (current collector 5 etc.) arranged in the case 3 and the inner surface of the case 3 is small. (The contact area is small.) As a result, the end portion on the opening side is a portion of the trunk portion 312 where the heat generated by the electrode body 2 and the like is difficult to conduct (that is, even if it is cooled by the cooling member 70 and the like, the inside of the case 3 is is a portion that is difficult to cool). Therefore, by arranging the adhesive layer 8 at the end position on the opening side of the trunk portion 312, the adhesive layer 8 is placed at a position facing another region (part) of the trunk portion 312 to which heat is easily transmitted from the inside. The lowering of the cooling efficiency of the electric storage element 1 can be suppressed compared to the case where the cooling efficiency inside the case 3 through the other region of the trunk portion 312 is lowered by the arrangement.

尚、蓄電装置１０Ａでは、各蓄電素子１において、接着層８が長壁部３１３の全域と対向するように第二部位７２Ａに配置されてもよい。かかる構成によれば、隣接する二つの蓄電素子１のケース３同士の間に接着層８（長壁部３１３の全域に広がる接着層８）が介在することとなるため、前記接着層８がない場合に比べ、一方の蓄電素子１のケース３から他方の蓄電素子１のケース３に熱が伝わり難くなる。これにより、例えば、前記隣接する二つの蓄電素子１のうちの一方の蓄電素子１の温度が上昇したときに、前記一方の蓄電素子１から他方の蓄電素子１への熱の影響が抑えられる。即ち、前記一方の蓄電素子１からの熱に起因する前記他方の蓄電素子１での温度上昇が抑えられる。 In addition, in the power storage device 10A, in each power storage element 1, the adhesive layer 8 may be arranged in the second portion 72A so as to face the entire length of the long wall portion 313. As shown in FIG. According to such a configuration, the adhesive layer 8 (the adhesive layer 8 extending over the entire long wall portion 313) is interposed between the cases 3 of the two adjacent storage elements 1. Heat is less likely to be conducted from the case 3 of one storage element 1 to the case 3 of the other storage element 1 than in the case of the other storage element 1 . As a result, for example, when the temperature of one storage element 1 of the two adjacent storage elements 1 rises, the influence of heat from the one storage element 1 to the other storage element 1 can be suppressed. That is, the temperature rise in the other storage element 1 caused by the heat from the one storage element 1 is suppressed.

また、図１５に示す蓄電装置１０Ａでは、冷却部材７０は、各蓄電素子１を閉塞部３１１側から冷却するがこの構成に限定されない。図１７に示すように、蓄電装置１０Ａでは、蓄電素子１のＸ軸方向の寸法がＺ軸方向の寸法より大きいため、冷却面積が十分に確保できる閉塞部３１１側に冷却部材７０が配置されている。しかし、図１８に示すように、蓄電素子１ＡのＺ軸方向の寸法がＸ軸方向の寸法より大きい場合には、冷却面積が十分に確保されるよう、短壁部３１４側に冷却部材７０が配置されるのが好ましい。この場合、接着層８は、外装シート７において、ケース３の外面における冷却部材７０によって冷却される領域以外の領域と対向する位置（図１８に示す例では、ケース３の各長壁部３１３、冷却部材７０と対向していない短壁部（図１８における右側の短壁部）３１４、閉塞部３１１等の少なくとも一つ）と対向する位置に配置される。 In the power storage device 10A shown in FIG. 15, the cooling member 70 cools each power storage element 1 from the closed portion 311 side, but the configuration is not limited to this. As shown in FIG. 17, in the power storage device 10A, the dimension of the power storage element 1 in the X-axis direction is larger than the dimension in the Z-axis direction. there is However, as shown in FIG. 18, when the dimension of the power storage element 1A in the Z-axis direction is larger than the dimension in the X-axis direction, the cooling member 70 is provided on the side of the short wall portion 314 so as to ensure a sufficient cooling area. is preferably located. In this case, the adhesive layer 8 is positioned on the exterior sheet 7 so as to face a region other than the region cooled by the cooling member 70 on the outer surface of the case 3 (in the example shown in FIG. It is arranged at a position facing the short wall portion (at least one of the short wall portion 314 on the right side in FIG. 18, the blocking portion 311, etc.) that does not face the member 70 .

また、上記実施形態においては、蓄電素子が充放電可能な非水電解質二次電池（例えばリチウムイオン二次電池）として用いられる場合について説明したが、蓄電素子の種類や大きさ（容量）は任意である。また、上記実施形態において、蓄電素子の一例として、リチウムイオン二次電池について説明したが、これに限定されるものではない。例えば、本発明は、種々の二次電池、その他、一次電池や、電気二重層キャパシタ等のキャパシタの蓄電素子にも適用可能である。 In addition, in the above embodiment, the storage element is used as a chargeable/dischargeable non-aqueous electrolyte secondary battery (for example, a lithium-ion secondary battery), but the type and size (capacity) of the storage element are arbitrary. is. Also, in the above embodiments, a lithium ion secondary battery has been described as an example of a storage element, but the storage element is not limited to this. For example, the present invention can be applied to various secondary batteries, primary batteries, and electric storage elements of capacitors such as electric double layer capacitors.

Claims (12)

電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がると共に該ケースの周方向に延び、且つ該ケースを周方向にのみ囲う一つの外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有する、蓄電素子。 an electrode body;
a case that accommodates the electrode body;
an exterior sheet that spreads along the outer surface of the case, extends in the circumferential direction of the case, and surrounds the case only in the circumferential direction;
and an adhesive layer that fixes the exterior sheet to the outer surface of the case,
The electric storage element, wherein the exterior sheet has a portion facing the outer surface of the case via the adhesive layer and a portion directly facing the outer surface of the case. 電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がり且つ該ケースを周方向に囲う一つの外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、
前記ケースに収容され且つ前記電極体の熱が伝わる内部部材と、
前記ケースと前記電極体との間、及び前記ケースと前記内部部材との間に配置される絶縁部材と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有し、
前記内部部材は、前記ケースの内面の一部に前記絶縁部材を介して当接し、
前記接着層は、前記ケースの外面の所定位置であって、前記内部部材が前記絶縁部材を介して該ケースの内面に当接している位置を避けた所定位置に配置される、蓄電素子。 an electrode body;
a case that accommodates the electrode body;
an exterior sheet that extends along the outer surface of the case and surrounds the case in the circumferential direction;
an adhesive layer for fixing the outer sheet to the outer surface of the case;
an internal member that is housed in the case and conducts the heat of the electrode body;
an insulating member disposed between the case and the electrode body and between the case and the internal member ;
The exterior sheet has a portion facing the outer surface of the case via the adhesive layer and a portion directly facing the outer surface of the case ,
The internal member contacts a portion of the inner surface of the case via the insulating member,
The electric storage element , wherein the adhesive layer is arranged at a predetermined position on the outer surface of the case, avoiding a position where the inner member is in contact with the inner surface of the case via the insulating member . 電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がり且つ該ケースを周方向に囲う一つの外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有すると共に、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されている、蓄電素子。 an electrode body;
a case that accommodates the electrode body;
an exterior sheet that extends along the outer surface of the case and surrounds the case in the circumferential direction;
and an adhesive layer that fixes the exterior sheet to the outer surface of the case,
The case has a rectangular tubular peripheral wall with a plurality of corners in the circumferential direction,
The exterior sheet has a portion that faces the outer surface of the case via the adhesive layer and a portion that directly faces the outer surface of the case , straddles at least one corner in the circumferential direction, fixed to the peripheral wall under tension in the circumferential direction;
The electric storage element , wherein the adhesive layer is arranged at a position not overlapping the top of the corner when viewed from the thickness direction of the peripheral wall of the case . 前記ケースは、周方向に複数の角部を有する角筒状の周壁を有し、
前記外装シートは、少なくとも一つの前記角部を前記周方向に跨ぎ且つ前記周方向の張力が加わっている状態で前記周壁に固定され、
前記接着層は、前記ケースの周壁の厚さ方向から見て前記角部の頂部と重ならない位置に配置されている、請求項２に記載の蓄電素子。 The case has a rectangular tubular peripheral wall with a plurality of corners in the circumferential direction,
The exterior sheet is fixed to the peripheral wall while straddling at least one of the corners in the circumferential direction and under tension in the circumferential direction,
3. The electric storage device according to claim 2 , wherein said adhesive layer is arranged at a position not overlapping the top of said corner when viewed from the thickness direction of said peripheral wall of said case. 前記電極体は、積層された状態で巻回される電極を有し、
前記周壁は、前記電極体の巻回中心軸方向における該電極体の両側において該巻回中心軸方向と直交する一対の第一外壁面と、該第一外壁面と直交する方向に広がり且つ前記一対の第一外壁面の対応する端部同士を接続する一対の第二外壁面と、を有し、
前記第二外壁面は、周方向において、前記第一外壁面より長く、
前記接着層は、前記第二外壁面に配置される、請求項３又は４に記載の蓄電素子。 The electrode body has an electrode wound in a laminated state,
The peripheral wall includes a pair of first outer wall surfaces perpendicular to the winding central axis direction on both sides of the electrode body in the winding central axis direction of the electrode body, and a pair of first outer wall surfaces extending in a direction perpendicular to the first outer wall surfaces and a pair of second outer wall surfaces connecting corresponding ends of the pair of first outer wall surfaces,
The second outer wall surface is longer than the first outer wall surface in the circumferential direction,
5. The electric storage device according to claim 3 , wherein said adhesive layer is arranged on said second outer wall surface. 前記接着層は、前記電極体の巻回中心軸方向における該電極体の端部と、該巻回中心軸方向と直交する方向に重なる位置に配置される、請求項５に記載の蓄電素子。 The electric storage element according to claim 5 , wherein the adhesive layer is arranged at a position overlapping an end of the electrode body in the winding central axis direction of the electrode body in a direction orthogonal to the winding central axis direction. 電極体と、
前記電極体を収容するケースと、
前記ケースの外面に沿って広がり且つ該ケースを周方向に囲う一つの外装シートと、
前記外装シートを前記ケースの外面に固定する接着層と、を備え、
前記外装シートは、前記ケースの外面と前記接着層を介して対向する部分と、前記ケースの外面と直接対向する部分と、を有し、
前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置される、蓄電素子。 an electrode body;
a case that accommodates the electrode body;
an exterior sheet that extends along the outer surface of the case and surrounds the case in the circumferential direction;
and an adhesive layer that fixes the exterior sheet to the outer surface of the case,
The exterior sheet has a portion facing the outer surface of the case via the adhesive layer and a portion directly facing the outer surface of the case ,
The outer surface of the case includes a first surface on which external terminals are arranged and a second surface opposite to the first surface,
The exterior sheet covers the second surface,
The electric storage element , wherein the adhesive layer is arranged at a position facing a region of the outer surface of the case other than the second surface . 電極体と、
前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケースと、
前記周壁の周方向に延び且つ該周壁の外面を覆う一つの外装シートと、
周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層と、を備え、
前記積層された一方の端部及び他方の端部は、前記角部の頂部と重ならない位置に配置され、
前記ケースの外面は、外部端子が配置される第一の面と、前記第一の面と反対側の第二の面と、を含み、
前記外装シートは、前記第二の面を覆い、
前記接着層は、前記ケースの外面のうちの前記第二の面以外の領域と対向する位置に配置される、蓄電素子。 an electrode body;
a case that surrounds the electrode body and has a rectangular cylindrical peripheral wall that has a plurality of corners in the circumferential direction;
an exterior sheet extending in the circumferential direction of the peripheral wall and covering the outer surface of the peripheral wall;
an adhesive layer that bonds one end and the other end of the exterior sheet in a state in which the one end and the other end are laminated in the circumferential direction,
The stacked one end and the other end are arranged at a position that does not overlap the top of the corner ,
The outer surface of the case includes a first surface on which external terminals are arranged and a second surface opposite to the first surface,
The exterior sheet covers the second surface,
The electric storage element , wherein the adhesive layer is arranged at a position facing a region of the outer surface of the case other than the second surface . 第一方向に並ぶ複数の蓄電素子であって、請求項１～８のいずれか１項に記載の蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、を備える、蓄電装置。 a plurality of storage elements arranged in a first direction, the plurality of storage elements including at least one storage element according to any one of claims 1 to 8;
and a holding member that holds the plurality of power storage elements. 前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置される、請求項９に記載の蓄電装置。 A cooling member arranged along the row of the plurality of power storage elements arranged in the first direction and cooling the plurality of power storage elements,
10. The power storage device according to claim 9, wherein said adhesive layer is arranged at a position facing a region other than a region cooled by said cooling member on the outer surface of said case. 第一方向に並ぶ複数の蓄電素子であって、電極体、前記電極体を収容するケース、前記ケースの外面に沿って広がり且つ該ケースを周方向に囲う一つの外装シート、及び、前記外装シートを前記ケースの外面に固定する接着層、を有し、前記外装シートが、前記ケースの外面と前記接着層を介して対向する部分、及び前記ケースの外面と直接対向する部分、を有する蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、
前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材と、を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置される、蓄電装置。 A plurality of power storage elements arranged in a first direction, comprising: an electrode body; a case containing the electrode body; one exterior sheet extending along the outer surface of the case and surrounding the case in the circumferential direction; to the outer surface of the case, and the exterior sheet has a portion facing the outer surface of the case via the adhesive layer and a portion directly facing the outer surface of the case. a plurality of storage elements including at least one of
a holding member that holds the plurality of power storage elements;
a cooling member arranged along the row of the plurality of power storage elements arranged in the first direction and cooling the plurality of power storage elements ;
The power storage device , wherein the adhesive layer is arranged at a position facing a region other than the region cooled by the cooling member on the outer surface of the case . 第一方向に並ぶ複数の蓄電素子であって、電極体、前記電極体を囲い且つ周方向に複数の角部を有する角筒状の周壁を有するケース、前記周壁の周方向に延び且つ該周壁の外面を覆う一つの外装シート、及び、周方向における前記外装シートの一方の端部と他方の端部とが積層された状態で、該一方の端部と該他方の端部とを接着する接着層、を有し、前記積層された一方の端部及び他方の端部が前記角部の頂部と重ならない位置に配置される蓄電素子を少なくとも一つ含む複数の蓄電素子と、
前記複数の蓄電素子を保持する保持部材と、
前記第一方向に並ぶ複数の蓄電素子の列に沿って配置され、前記複数の蓄電素子を冷却する冷却部材と、を備え、
前記接着層は、前記ケースの外面における前記冷却部材によって冷却される領域以外の領域と対向する位置に配置される、蓄電装置。 A plurality of power storage elements arranged in a first direction, comprising: an electrode body; a case having a rectangular tubular peripheral wall surrounding the electrode body and having a plurality of corners in the circumferential direction; and one end and the other end of the exterior sheet in the circumferential direction are laminated, and the one end and the other end are bonded a plurality of power storage elements having an adhesive layer, and including at least one power storage element arranged at a position where one end and the other end of the stacked layers do not overlap the top of the corner ;
a holding member that holds the plurality of power storage elements;
a cooling member arranged along the row of the plurality of power storage elements arranged in the first direction and cooling the plurality of power storage elements ;
The power storage device , wherein the adhesive layer is arranged at a position facing a region other than the region cooled by the cooling member on the outer surface of the case .
JP2018551645A 2016-11-15 2017-11-14 Power storage element and power storage device Active JP7133151B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016222473 2016-11-15
JP2016222473 2016-11-15
PCT/JP2017/040961 WO2018092775A1 (en) 2016-11-15 2017-11-14 Power storage element, and power storage device

Publications (2)

Publication Number Publication Date
JPWO2018092775A1 JPWO2018092775A1 (en) 2019-10-17
JP7133151B2 true JP7133151B2 (en) 2022-09-08

Family

ID=62145555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2018551645A Active JP7133151B2 (en) 2016-11-15 2017-11-14 Power storage element and power storage device

Country Status (2)

Country Link
JP (1) JP7133151B2 (en)
WO (1) WO2018092775A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115803945B (en) 2021-01-28 2024-01-12 宁德时代新能源科技股份有限公司 Insulating film, battery cell, battery and electric equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001307784A (en) 2000-04-20 2001-11-02 Japan Storage Battery Co Ltd Battery set
JP2013012441A (en) 2011-06-30 2013-01-17 Sanyo Electric Co Ltd Electric power source device and vehicle including the same
JP2013541152A (en) 2010-09-21 2013-11-07 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Housing for galvanic elements
JP2014197467A (en) 2013-03-29 2014-10-16 株式会社Ｇｓユアサ Storage element and cover method of the same
WO2016035395A1 (en) 2014-09-03 2016-03-10 日立オートモティブシステムズ株式会社 Prismatic secondary battery
JP2016152118A (en) 2015-02-17 2016-08-22 株式会社Ｇｓユアサ Winding core for electrode body, power storage element, and method of manufacturing power storage element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001307784A (en) 2000-04-20 2001-11-02 Japan Storage Battery Co Ltd Battery set
JP2013541152A (en) 2010-09-21 2013-11-07 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Housing for galvanic elements
JP2013012441A (en) 2011-06-30 2013-01-17 Sanyo Electric Co Ltd Electric power source device and vehicle including the same
JP2014197467A (en) 2013-03-29 2014-10-16 株式会社Ｇｓユアサ Storage element and cover method of the same
WO2016035395A1 (en) 2014-09-03 2016-03-10 日立オートモティブシステムズ株式会社 Prismatic secondary battery
JP2016152118A (en) 2015-02-17 2016-08-22 株式会社Ｇｓユアサ Winding core for electrode body, power storage element, and method of manufacturing power storage element

Also Published As

Publication number Publication date
WO2018092775A1 (en) 2018-05-24
JPWO2018092775A1 (en) 2019-10-17

Similar Documents

Publication Publication Date Title
KR102382525B1 (en) Secondary battery and secondary battery array
KR101885908B1 (en) Rechargeable battery pack
KR102468657B1 (en) Battery element having a heat conducting member
KR20130053000A (en) Rechargeable battery pack
JP7049603B2 (en) A power storage element, a power storage device including a power storage element, a mobile body including a power storage element, and a power storage system including a power storage element.
KR101261243B1 (en) Battery Cell Containing Protection Type of Modified Structure And Battery Module Employed with the Same
JP2006172870A (en) Battery and battery pack
US11411256B2 (en) Battery pack
JP7133151B2 (en) Power storage element and power storage device
WO2021060008A1 (en) Secondary battery
US20120208076A1 (en) Electrochemical cell
US10930979B2 (en) Energy storage device and method of manufacturing energy storage device
JP6827646B2 (en) Power storage element
JPWO2020059297A1 (en) Battery module
JP6936397B2 (en) Connection structure and battery module
US10320035B2 (en) Battery pack
JP2019106256A (en) Power storage element
US11664525B2 (en) Method for manufacturing energy storage device and energy storage device
JP6341026B2 (en) Power storage device
JP7405687B2 (en) Energy storage element
US11495843B2 (en) Battery pack
JP2022122116A (en) Electrode body and power storage element
US20230118792A1 (en) Secondary battery
JP7116905B2 (en) Storage element
WO2021014704A1 (en) Rectangular secondary battery

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20201008

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20210910

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20211109

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20220408

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20220603

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20220729

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20220811

R150 Certificate of patent or registration of utility model

Ref document number: 7133151

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150