WO2016121416A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2016121416A1
WO2016121416A1 PCT/JP2016/050124 JP2016050124W WO2016121416A1 WO 2016121416 A1 WO2016121416 A1 WO 2016121416A1 JP 2016050124 W JP2016050124 W JP 2016050124W WO 2016121416 A1 WO2016121416 A1 WO 2016121416A1
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WO
WIPO (PCT)
Prior art keywords
layer
face
active material
storage device
electrolyte
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Application number
PCT/JP2016/050124
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French (fr)
Japanese (ja)
Inventor
広貴 堀口
法久 青木
宏 國松
上田　安彦
達弥 水嶋
Original Assignee
株式会社村田製作所
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Publication of WO2016121416A1 publication Critical patent/WO2016121416A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the 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
    • H01G11/54—Electrolytes
    • H01G11/56—Solid electrolytes, e.g. gels; Additives therein
    • 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
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/80—Gaskets; Sealings
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a power storage device.
  • Patent Document 1 describes a packageless electric double layer capacitor.
  • the power storage device described in Patent Document 1 includes a first internal electrode drawn out to a first end face, a second internal electrode drawn out to a second end face, a first internal electrode, and a second internal And a separator disposed between the electrodes.
  • a first external electrode that is electrically connected to the first internal electrode is disposed on the first end face.
  • a second external electrode electrically connected to the second internal electrode is disposed on the second end surface.
  • the electric double layer capacitor described in Patent Document 1 has an advantage that it can be mounted on a mounting board.
  • Patent Document 1 There is a desire to improve the reliability of a packageless electric double layer capacitor as described in Patent Document 1.
  • the main object of the present invention is to improve the reliability of the electric double layer capacitor.
  • the electricity storage device includes a device body, a first external electrode, and a second external electrode.
  • the device body has first and second main surfaces, first and second side surfaces, and first and second end surfaces.
  • the first and second main surfaces extend along the length direction and the width direction.
  • the first and second side surfaces extend along the length direction and the thickness direction.
  • a part of the first and second end faces extends along the width direction and the thickness direction.
  • the first external electrode is provided on the device body.
  • the second external electrode is provided on the device body.
  • the device body includes a first internal electrode, a second internal electrode, an electrolyte-containing layer, a first isolation layer, and a second isolation layer.
  • the first internal electrode includes a first current collector and a first active material layer.
  • the first active material layer is provided on at least one of both surfaces of the first current collector. At least the first current collector of the first current collector and the first active material layer is drawn out to the first end face.
  • the second internal electrode has a second current collector and a second active material layer. The second active material layer is provided on at least one of both surfaces of the second current collector. At least the second current collector of the second current collector and the second active material layer is drawn out to the second end face.
  • the electrolyte-containing layer is provided separately from the first end surface and the second end surface between the first active material layer and the second active material layer.
  • the electrolyte containing layer contains an electrolyte.
  • the first isolation layer is provided so as to isolate the electrolyte-containing layer from the first end surface.
  • the second isolation layer is provided so as to isolate the electrolyte-containing layer from the second end surface.
  • the electricity storage device according to the present invention since the first and second isolation layers are provided, the electrolyte hardly leaks from the first and second electrolyte-containing layers. Therefore, the electricity storage device according to the present invention has excellent reliability.
  • the first isolation layer is isolated from the first end surface, and the first active material layer is provided from the first isolation layer to the first end surface. It is preferable.
  • the second isolation layer is isolated from the second end surface, and the second active material layer is provided from the second isolation layer to the second end surface. It is preferable.
  • the power storage device includes a first body provided between the first internal electrode and the second internal electrode in a portion of the device body located on the first end face side of the first isolation layer. And a second filling layer provided between the first internal electrode and the second internal electrode in a portion of the device body located on the second end face side of the second isolation layer. And may be further provided.
  • a portion of the device body located on the first end face side of the first isolation layer and a position of the device body on the second end face side of the second isolation layer It is possible to suppress deformation from the portion to be performed. For this reason, disconnection of the first and second internal electrodes is unlikely to occur. Therefore, the reliability of the manufactured electricity storage device can be further improved.
  • the first and second isolation layers are preferably resin layers.
  • the “resin layer” includes a layer made of a resin composition containing a resin, a filler, and the like in addition to a layer made only of a resin.
  • the resin layer may include an acrylic resin. Since the resin layer hardly allows the electrolyte to pass therethrough, higher reliability can be realized.
  • each of the first and second external electrodes may have a sprayed film covering the first or second end face and a metal cap covering the sprayed film.
  • the electrolyte-containing layer may be composed of a gel containing an electrolyte.
  • the reliability of the electric double layer capacitor can be improved.
  • FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a schematic plan view of the first end face of the device body in the first embodiment.
  • FIG. 4 is a schematic cross-sectional view of the electricity storage device according to the second embodiment.
  • FIG. 5 is a schematic cross-sectional view of the electricity storage device according to the third embodiment.
  • FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a schematic plan view of the first end face of the device body in the present embodiment.
  • the power storage device 1 shown in FIGS. 1 to 3 is, for example, an electric double layer capacitor or a device constituting a secondary battery.
  • the electricity storage device 1 includes a device body 10.
  • the device body 10 has first and second main surfaces 10a and 10b, first and second side surfaces 10c and 10d, and first and second end surfaces 10e and 10f.
  • the first and second main surfaces 10a and 10b extend along the length direction L and the width direction W, respectively.
  • the first main surface 10a and the second main surface 10b face each other in the thickness direction T.
  • the first and second side surfaces 10c and 10d extend along the length direction L and the thickness direction T, respectively.
  • the first side surface 10c and the second side surface 10d face each other in the width direction W.
  • Part of each of the first and second end faces 10e, 10f extends along the width direction W and the thickness direction T.
  • the first end surface 10e and the second end surface 10f face each other in the length direction L.
  • the device body 10 is provided in a substantially rectangular parallelepiped shape.
  • the first end face 10e has a first portion 10e1 and a second portion 10e2.
  • the first portion 10 e 1 extends along the width direction W and the thickness direction T.
  • the second portion 10e2 is located outside the first portion 10e1.
  • the second portion 10e2 connects the first portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d.
  • the second portion 10e2 is inclined with respect to the first portion 10e1. Specifically, the second portion 10e2 extends toward the center in the length direction L of the device body 10 as it goes outward from the first portion 10e1 side.
  • the second end surface 10f also has a third portion 10f1 and a fourth portion 10f2 in the same manner as the first end surface 10e.
  • the third portion 10f1 extends along the width direction W and the thickness direction T.
  • the fourth portion 10f2 is located outside the third portion 10f1.
  • the fourth portion 10f2 connects the third portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d.
  • the fourth portion 102 is inclined with respect to the third portion 10f1. Specifically, the fourth portion 10f2 extends toward the center side in the length direction L of the device body 10 as it goes outward from the third portion 10f1 side.
  • the device body 10 has a plurality of first internal electrodes 11 and a plurality of second internal electrodes 12.
  • the first and second internal electrodes 11 and 12 are alternately provided along the thickness direction T.
  • the first internal electrode 11 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the first internal electrode 11 is drawn out to the first end face 10e. The first internal electrode 11 is not drawn out to the second end face 10f and the first and second side faces 10c, 10d.
  • the first internal electrode 11 has a first current collector 11a and first active material layers 11b and 11c.
  • the first active material layers 11b and 11c are provided on at least one of the first current collectors 11a.
  • first active material layers 11b and 11c are provided on both surfaces of the first current collector 11a.
  • the first current collector 11a can be made of a metal foil made of at least one metal such as aluminum or copper.
  • a first active material layer 11b is provided on one surface of the first current collector 11a, and a first active material layer 11c is provided on the other surface.
  • the first active material layers 11b and 11c are members that constitute a polarizable electrode when the electricity storage device 1 constitutes an electric double layer capacitor.
  • the first active material layers 11b and 11c include a carbon material such as activated carbon.
  • the second internal electrode 12 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the second internal electrode 12 is drawn out to the second end face 10f. The second internal electrode 12 is not drawn out to the first end face 10e and the first and second side faces 10c, 10d.
  • the second internal electrode 12 has a second current collector 12a and second active material layers 12b and 12c.
  • the second active material layers 12b and 12c are provided on the surface of at least one side of the second current collector 12a.
  • second active material layers 12b and 12c are provided on both surfaces of the second current collector 12a.
  • the second current collector 12a can be made of a metal foil made of at least one metal such as aluminum or copper.
  • the second active material layer 12b is provided on one surface of the second current collector 12a, and the second active material layer 12c is provided on the other surface.
  • the second active material layers 12b and 12c are members constituting a polarizable electrode when the electricity storage device 1 constitutes an electric double layer capacitor.
  • the second active material layers 12b and 12c include a carbon material such as activated carbon.
  • the second active material layer 12c is opposed to the first active material layer 11b.
  • the second active material layer 12b is opposed to the first active material layer 11c.
  • the first electrolyte containing layer 13a is provided on the first active material layer 11b.
  • a first electrolyte-containing layer 13b is provided on the first active material layer 11c.
  • the first electrolyte containing layers 13 a and 13 b are provided on the first internal electrode 11.
  • the first electrolyte-containing layers 13a and 13b are provided separately from the second end face 10f.
  • a second electrolyte-containing layer 13c is provided on the second active material layer 12b.
  • a second electrolyte-containing layer 13d is provided on the second active material layer 12c.
  • the second electrolyte containing layers 13 c and 13 d are provided on the second internal electrode 12.
  • the second electrolyte-containing layers 13c and 13d are provided separately from the first end face 10e.
  • first electrolyte-containing layer and the second electrolyte-containing layer may be provided integrally. That is, the first electrolyte-containing layer and the second electrolyte-containing layer that are adjacent to each other may be provided integrally.
  • Electrolyte-containing layers 13a, 13b, 13c, and 13d each contain an electrolyte.
  • the electrolyte-containing layers 13a, 13b, 13c, and 13d are each preferably composed of a gel containing an electrolyte.
  • a gel for example, a high molecular polyethylene oxide resin or the like can be used.
  • the first active material layer 11b and the second active material layer 12c are opposed to each other via the first electrolyte-containing layer 13a and the second electrolyte-containing layer 13d.
  • the first active material layer 11c and the second active material layer 12b are opposed to each other via the first electrolyte-containing layer 13b and the second electrolyte-containing layer 13c.
  • the device body 10 includes a functional unit 10A and an exterior body 10B.
  • 10 A of functional parts are parts which express the function as an electrical storage device.
  • the functional unit 10A includes the first and second internal electrodes 11 and 12 and the electrolyte-containing layers 13a, 13b, 13c, and 13d described above.
  • the exterior body 10B covers a part of the outer surface of the functional unit 10A. Specifically, the exterior body 10B covers the first and second main surfaces and the first and second side surfaces of the functional unit 10A. The first and second end faces of the functional unit 10A are exposed from the exterior body 10B. Accordingly, the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d are constituted by the exterior body 10B. The first and second end faces 10e, 10f are configured by a functional unit 10A and an exterior body 10B.
  • the first external electrode 18 is provided on the first end face 10e.
  • the first external electrode 18 is electrically connected to the first internal electrode 11.
  • the first external electrode 18 includes a first electrode film 18a and a first metal cap 18b.
  • the first electrode film 18 a is connected to the first internal electrode 11.
  • the first electrode film 18a is provided so as to cover the first end face 10e. Specifically, the first electrode film 18a covers substantially the entire first end face 10e.
  • the first electrode film 18a is provided so as to extend from the first portion 10e1 to the second portion 10e2. The end portion of the first electrode film 18a is located on the second portion 10e2.
  • the first electrode film 18a is not located on the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d.
  • the first metal cap 18b covers a portion of the device body 10 on the first end face 10e side. Specifically, the first metal cap 18b includes the first end face 10e, the first end faces 10e of the first and second main faces 10a and 10b, and the first and second side faces 10c and 10d. Covers the side part.
  • the first metal cap 18b is electrically connected to the first electrode film 18a.
  • a second external electrode 19 is provided on the second end face 10f.
  • the second external electrode 19 is electrically connected to the second internal electrode 12.
  • the second external electrode 19 includes a second electrode film 19a and a second metal cap 19b.
  • the second electrode film 19 a is connected to the second internal electrode 12.
  • the second electrode film 19a is provided so as to cover the second end face 10f.
  • the second electrode film 19a is provided so as to cover substantially the entire second end face 10f.
  • the second electrode film 19a is provided so as to extend from the top of the third portion 10f1 to the top of the fourth portion 10f2.
  • the end portion of the second electrode film 19a is located on the fourth portion 10f2.
  • the second electrode film 19a is not located on the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d.
  • the second metal cap 19b covers the portion of the device body 10 on the second end face 10f side.
  • the second metal cap 19b includes the second end face 10e, the first and second main faces 10a and 10b, and the second end faces 10f of the first and second side faces 10c and 10d. Covers the side part.
  • the second metal cap 19b is electrically connected to the second electrode film 19a.
  • the first and second electrode films 18a and 19a are each formed of a sprayed film.
  • the first and second electrode films 18a and 19a can be made of, for example, Al or an Al alloy.
  • the first and second metal caps 18b and 19b can be made of, for example, a Fe—Ni alloy, a Cu—Zn alloy, a Cu—Zn—Ni alloy, Al, or the like.
  • Plating films may be provided on the outer surfaces of the first and second metal caps 18b and 19b.
  • the plating film may be, for example, a Ni / Ag plating film, a Ni / Au plating film, a Ni / Sn plating film, or the like.
  • the first and second electrolyte-containing layers in a large area.
  • the electrolyte contained in the first electrolyte-containing layer may leak from the first end face.
  • the electrolyte contained in the second electrolyte-containing layer may leak from the second end face.
  • first isolation layers 14a and 14b that isolate the first electrolyte-containing layers 13a and 13b and the first end face 10e are provided.
  • Second isolation layers 15a and 15b are provided to isolate the second electrolyte-containing layers 13c and 13d from the second end face 10f. Since these isolation layers 14a, 14b, 15a, and 15b are provided, the electrolyte contained in the electrolyte-containing layers 13a, 13b, 13c, and 13d is unlikely to leak from the end faces 10e and 10f. Therefore, the electricity storage device 1 has excellent reliability.
  • third isolation layers 16a and 16b that isolate the first electrolyte-containing layers 13a and 13b and the second end face 10f are provided.
  • the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a material that does not allow electrolyte to permeate.
  • the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably constituted by, for example, a resin layer.
  • the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a resin composition containing, for example, an acrylic resin and a filler such as silica.
  • the first current collector layer 11a reaches the first end face 10e without being divided by the first isolation layers 14a and 14b.
  • the first active material layers 11b and 11c are divided into a portion on the first end face 10e side and a portion on the second end face 10f side by the first isolation layers 14a and 14b. Portions on the first end face 10e side of the first active material layers 11b and 11c reach the first end face 10e.
  • the first active material layers 11b and 11c are made of activated carbon or the like, the adhesion strength between the first active material layers 11b and 11c and the sprayed film 18a is high. For this reason, by providing the first active material layers 11b and 11c on the first end face 10e side so as to reach the first end face 10e, the first inner electrode 11 and the first outer electrode 18 The adhesion strength can be increased.
  • the second current collector layer 12a reaches the second end face 10f without being divided by the second isolation layers 15a and 15b.
  • the second active material layers 12b and 12c are divided by the second isolation layers 15a and 15b into a part on the first end face 10e side and a part on the second end face 10f side. Portions on the second end face 10f side of the second active material layers 12b and 12c reach the second end face 10f.
  • the adhesion strength between the second active material layers 12b and 12c and the sprayed film 18a is high. Therefore, by providing the second active material layers 12b and 12c on the second end face 10f side so as to reach the second end face 10f, the second internal electrode 12 and the second external electrode 19 The adhesion strength can be increased.
  • the electricity storage device 1 a part of the device body 10 that is located closer to the first end face 10e side than the first isolation layers 14a and 14b in the length direction L, and a second level than the second isolation layers 15a and 15b.
  • a filling layer 20 is provided between the first internal electrode 11 and the second internal electrode 12 in each of the portions located on the end face 10 f side. Therefore, a part of the device body 10 that is located on the first end surface 10e side with respect to the first isolation layers 14a and 14b in the length direction L, and a second end surface with respect to the second isolation layers 15a and 15b.
  • the difference between the thickness of each part located on the 10f side and the thickness of the other part of the device body 10 is reduced. For this reason, in the manufacturing process of the electrical storage device 1, disconnection etc. of the collectors 11a and 12a etc. are hard to occur. Further, it is difficult for foreign matter to enter the device body 10. Therefore, the electricity storage device 1 having excellent reliability can be easily manufactured.
  • FIG. 4 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
  • the third isolation layers 16a and 16b reach the first end face 10e
  • the fourth isolation layers 17a and 17b reach the second end face 10f
  • the filling layer It differs from the electrical storage device 1 according to the first embodiment in that 20 is not provided.
  • the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are provided, leakage of the electrolyte from the device body 10 can be effectively suppressed.
  • first isolation layers 14a and 14b do not reach the first end face 10e and the second isolation layers 15a and 15b do not reach the second end face 10f will be described.
  • One isolation layer 14a, 14b may reach the first end face 10e, and the second isolation layer 15a, 15b may reach the second end face 10f.
  • FIG. 5 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
  • the power storage device 1b according to the present embodiment is different from the power storage device 1a according to the second embodiment in that the filling layer 20 is provided.
  • the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are provided, leakage of the electrolyte from the device body 10 can be effectively suppressed.
  • the power storage device 1b is provided with the filling layer 20, it is possible to effectively suppress disconnection of the current collector layers 11a and 12a at the time of manufacture. Accordingly, it is possible to efficiently manufacture the electricity storage device 1b having excellent reliability.
  • Power storage device 10 Device body 10A Functional unit 10B Exterior body 10a First main surface 10b Second main surface 10c First side surface 10d Second side surface 10e First end surface 10e1 First portion 10e2 First Second portion 10f second end face 10f1 third portion 10f2 fourth portion 11 first internal electrode 11a first current collector 11b, 11c first active material layer 12 second internal electrode 12a second Current collectors 12b, 12c Second active material layers 13a, 13b First electrolyte-containing layers 13c, 13d Second electrolyte-containing layers 14a, 14b First isolation layers 15a, 15b Second isolation layers 16a, 16b 3rd isolation layer 17a, 17b 4th isolation layer 18 1st external electrode 18a 1st electrode film 18b 1st metal cap 19 2nd external electrode 19a 2nd electrode film 19b 2nd metal key -Up 20 filling layer

Abstract

The present invention improves the reliability of a power storage device. First separation layers 14a, 14b are provided so as to separate first electrolyte-containing layers 13a, 13b and a first end surface 10e from one another. Second separation layers 15a, 15b are provided so as to separate second electrolyte-containing layers 13c, 13d and a second end surface 10f from one another.

Description

蓄電デバイスPower storage device
　本発明は、蓄電デバイスに関する。 The present invention relates to a power storage device.
　従来、電気二重層コンデンサや二次電池などの蓄電デバイスが種々知られている。従来の電気二重層コンデンサは、パッケージ型のデバイスであることが一般的であった。 Conventionally, various electric storage devices such as electric double layer capacitors and secondary batteries are known. Conventional electric double layer capacitors are generally package type devices.
　一方、特許文献１には、パッケージレスの電気二重層コンデンサが記載されている。特許文献１に記載の蓄電デバイスは、第１の端面に引き出された第１の内部電極と、第２の端面に引き出された第２の内部電極と、第１の内部電極と第２の内部電極との間に配されたセパレータとを備えている。第１の端面の上には、第１の内部電極に電気的に接続された第１の外部電極が配されている。第２の端面の上には、第２の内部電極に電気的に接続された第２の外部電極が配されている。特許文献１に記載の電気二重層コンデンサは、実装基板に実装し得るという利点を有している。 On the other hand, Patent Document 1 describes a packageless electric double layer capacitor. The power storage device described in Patent Document 1 includes a first internal electrode drawn out to a first end face, a second internal electrode drawn out to a second end face, a first internal electrode, and a second internal And a separator disposed between the electrodes. A first external electrode that is electrically connected to the first internal electrode is disposed on the first end face. A second external electrode electrically connected to the second internal electrode is disposed on the second end surface. The electric double layer capacitor described in Patent Document 1 has an advantage that it can be mounted on a mounting board.
国際公開第２０１４／０８３９１９号公報International Publication No. 2014/083919
　特許文献１に記載のようなパッケージレスの電気二重層コンデンサの信頼性を向上したいという要望がある。 There is a desire to improve the reliability of a packageless electric double layer capacitor as described in Patent Document 1.
　本発明の主な目的は、電気二重層コンデンサの信頼性を向上することにある。 The main object of the present invention is to improve the reliability of the electric double layer capacitor.
　本発明に係る蓄電デバイスは、デバイス本体と、第１の外部電極と、第２の外部電極とを備える。デバイス本体は、第１及び第２の主面と、第１及び第２の側面と、第１及び第２の端面とを有する。第１及び第２の主面は、長さ方向及び幅方向に沿って延びる。第１及び第２の側面は、長さ方向及び厚み方向に沿って延びる。第１及び第２の端面は、一部が幅方向及び厚み方向に沿って延びる。第１の外部電極は、デバイス本体の上に設けられている。第２の外部電極は、デバイス本体の上に設けられている。デバイス本体は、第１の内部電極と、第２の内部電極と、電解質含有層と、第１の隔離層と、第２の隔離層とを備える。第１の内部電極は、第１の集電体と、第１の活物質層とを有する。第１の活物質層は、第１の集電体の両面の少なくとも一方の上に設けられている。第１の集電体及び第１の活物質層のうちの少なくとも第１の集電体は、第１の端面に引き出されている。第２の内部電極は、第２の集電体と、第２の活物質層とを有する。第２の活物質層は、第２の集電体の両面の少なくとも一方の上に設けられている。第２の集電体及び第２の活物質層のうちの少なくとも第２の集電体は、第２の端面に引き出されている。電解質含有層は、第１の活物質層及び第２の活物質層との間に、第１の端面及び第２の端面から隔離して設けられている。電解質含有層は、電解質を含有している。第１の隔離層は、電解質含有層と第１の端面とを隔離するように設けられている。第２の隔離層は、電解質含有層と第２の端面とを隔離するように設けられている。 The electricity storage device according to the present invention includes a device body, a first external electrode, and a second external electrode. The device body has first and second main surfaces, first and second side surfaces, and first and second end surfaces. The first and second main surfaces extend along the length direction and the width direction. The first and second side surfaces extend along the length direction and the thickness direction. A part of the first and second end faces extends along the width direction and the thickness direction. The first external electrode is provided on the device body. The second external electrode is provided on the device body. The device body includes a first internal electrode, a second internal electrode, an electrolyte-containing layer, a first isolation layer, and a second isolation layer. The first internal electrode includes a first current collector and a first active material layer. The first active material layer is provided on at least one of both surfaces of the first current collector. At least the first current collector of the first current collector and the first active material layer is drawn out to the first end face. The second internal electrode has a second current collector and a second active material layer. The second active material layer is provided on at least one of both surfaces of the second current collector. At least the second current collector of the second current collector and the second active material layer is drawn out to the second end face. The electrolyte-containing layer is provided separately from the first end surface and the second end surface between the first active material layer and the second active material layer. The electrolyte containing layer contains an electrolyte. The first isolation layer is provided so as to isolate the electrolyte-containing layer from the first end surface. The second isolation layer is provided so as to isolate the electrolyte-containing layer from the second end surface.
　本発明に係る蓄電デバイスでは、第１及び第２の隔離層が設けられているため、第１及び第２の電解質含有層から電解質が漏洩しにくい。従って、本発明に係る蓄電デバイスは、優れた信頼性を有する。 In the electricity storage device according to the present invention, since the first and second isolation layers are provided, the electrolyte hardly leaks from the first and second electrolyte-containing layers. Therefore, the electricity storage device according to the present invention has excellent reliability.
　本発明に係る蓄電デバイスでは、第１の隔離層が第１の端面から隔離しており、第１の活物質層が、第１の隔離層から第１の端面に至るように設けられていることが好ましい。本発明に係る蓄電デバイスでは、第２の隔離層が第２の端面から隔離しており、第２の活物質層が、第２の隔離層から第２の端面に至るように設けられていることが好ましい。 In the electricity storage device according to the present invention, the first isolation layer is isolated from the first end surface, and the first active material layer is provided from the first isolation layer to the first end surface. It is preferable. In the electricity storage device according to the present invention, the second isolation layer is isolated from the second end surface, and the second active material layer is provided from the second isolation layer to the second end surface. It is preferable.
　本発明に係る蓄電デバイスは、デバイス本体のうち第１の隔離層よりも第１の端面側に位置する部分において、第１の内部電極と第２の内部電極との間に設けられた第１の充填層と、デバイス本体のうち第２の隔離層よりも第２の端面側に位置する部分において、第１の内部電極と第２の内部電極との間に設けられた第２の充填層とをさらに備えていてもよい。この場合、蓄電デバイスの製造工程において、デバイス本体のうち第１の隔離層よりも第１の端面側に位置する部分と、デバイス本体のうち第２の隔離層よりも第２の端面側に位置する部分との変形を抑制することができる。このため、第１及び第２の内部電極の断線等が生じ難い。従って、製造された蓄電デバイスの信頼性をさらに向上することができる。 The power storage device according to the present invention includes a first body provided between the first internal electrode and the second internal electrode in a portion of the device body located on the first end face side of the first isolation layer. And a second filling layer provided between the first internal electrode and the second internal electrode in a portion of the device body located on the second end face side of the second isolation layer. And may be further provided. In this case, in the manufacturing process of the electricity storage device, a portion of the device body located on the first end face side of the first isolation layer and a position of the device body on the second end face side of the second isolation layer. It is possible to suppress deformation from the portion to be performed. For this reason, disconnection of the first and second internal electrodes is unlikely to occur. Therefore, the reliability of the manufactured electricity storage device can be further improved.
　本発明に係る蓄電デバイスでは、第１及び第２の隔離層が、樹脂層であることが好ましい。なお、本発明において、「樹脂層」は、樹脂のみならなる層に加えて、樹脂とフィラー等とを含む樹脂組成物からなる層を含むものとする。 In the electricity storage device according to the present invention, the first and second isolation layers are preferably resin layers. In the present invention, the “resin layer” includes a layer made of a resin composition containing a resin, a filler, and the like in addition to a layer made only of a resin.
　本発明に係る蓄電デバイスでは、樹脂層がアクリル樹脂を含んでいてもよい。樹脂層は、電解質を通過させにくいため、より優れた信頼性を実現することができる。 In the electricity storage device according to the present invention, the resin layer may include an acrylic resin. Since the resin layer hardly allows the electrolyte to pass therethrough, higher reliability can be realized.
　本発明に係る蓄電デバイスでは、第１及び第２の外部電極のそれぞれが、第１又は第２の端面を覆う溶射膜と、溶射膜を覆う金属キャップとを有していてもよい。 In the electricity storage device according to the present invention, each of the first and second external electrodes may have a sprayed film covering the first or second end face and a metal cap covering the sprayed film.
　本発明に係る蓄電デバイスでは、電解質含有層が、電解質を含むゲルにより構成されていてもよい。 In the electricity storage device according to the present invention, the electrolyte-containing layer may be composed of a gel containing an electrolyte.
　本発明によれば、電気二重層コンデンサの信頼性を向上することができる。 According to the present invention, the reliability of the electric double layer capacitor can be improved.
図１は、第１の実施形態に係る蓄電デバイスの模式的斜視図である。FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment. 図２は、図１の線ＩＩ－ＩＩにおける模式的断面図である。FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 図３は、第１の実施形態におけるデバイス本体の第１の端面の模式的平面図である。FIG. 3 is a schematic plan view of the first end face of the device body in the first embodiment. 図４は、第２の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 4 is a schematic cross-sectional view of the electricity storage device according to the second embodiment. 図５は、第３の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 5 is a schematic cross-sectional view of the electricity storage device according to the third embodiment.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、本実施形態に係る蓄電デバイスの模式的斜視図である。図２は、図１の線ＩＩ－ＩＩにおける模式的断面図である。図３は、本実施形態におけるデバイス本体の第１の端面の模式的平面図である。 (First embodiment)
FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic plan view of the first end face of the device body in the present embodiment.
　図１～図３に示す蓄電デバイス１は、例えば、電気二重層コンデンサや、二次電池を構成するデバイスである。 The power storage device 1 shown in FIGS. 1 to 3 is, for example, an electric double layer capacitor or a device constituting a secondary battery.
　蓄電デバイス１は、デバイス本体１０を備えている。デバイス本体１０は、第１及び第２の主面１０ａ、１０ｂと、第１及び第２の側面１０ｃ、１０ｄと、第１及び第２の端面１０ｅ、１０ｆとを有する。第１及び第２の主面１０ａ、１０ｂは、それぞれ、長さ方向Ｌ及び幅方向Ｗに沿って延びている。第１の主面１０ａと第２の主面１０ｂとは、厚み方向Ｔにおいて対向している。第１及び第２の側面１０ｃ、１０ｄは、それぞれ、長さ方向Ｌ及び厚み方向Ｔに沿って延びている。第１の側面１０ｃと第２の側面１０ｄとは、幅方向Ｗにおいて対向している。第１及び第２の端面１０ｅ、１０ｆのそれぞれの一部は、幅方向Ｗ及び厚み方向Ｔに沿って延びている。第１の端面１０ｅと第２の端面１０ｆとは、長さ方向Ｌにおいて対向している。本実施形態では、デバイス本体１０は、略直方体状に設けられている。 The electricity storage device 1 includes a device body 10. The device body 10 has first and second main surfaces 10a and 10b, first and second side surfaces 10c and 10d, and first and second end surfaces 10e and 10f. The first and second main surfaces 10a and 10b extend along the length direction L and the width direction W, respectively. The first main surface 10a and the second main surface 10b face each other in the thickness direction T. The first and second side surfaces 10c and 10d extend along the length direction L and the thickness direction T, respectively. The first side surface 10c and the second side surface 10d face each other in the width direction W. Part of each of the first and second end faces 10e, 10f extends along the width direction W and the thickness direction T. The first end surface 10e and the second end surface 10f face each other in the length direction L. In the present embodiment, the device body 10 is provided in a substantially rectangular parallelepiped shape.
　図２及び図３に示すように、第１の端面１０ｅは、第１の部分１０ｅ１と、第２の部分１０ｅ２とを有する。第１の部分１０ｅ１は、幅方向Ｗ及び厚み方向Ｔに沿って延びている。第２の部分１０ｅ２は、第１の部分１０ｅ１の外側に位置している。第２の部分１０ｅ２は、第１の部分１０ｅ１と、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄとを接続している。第２の部分１０ｅ２は、第１の部分１０ｅ１に対して傾斜している。具体的には、第２の部分１０ｅ２は、第１の部分１０ｅ１側から外側にいくに従ってデバイス本体１０の長さ方向Ｌにおける中央側に向かって延びている。 As shown in FIGS. 2 and 3, the first end face 10e has a first portion 10e1 and a second portion 10e2. The first portion 10 e 1 extends along the width direction W and the thickness direction T. The second portion 10e2 is located outside the first portion 10e1. The second portion 10e2 connects the first portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d. The second portion 10e2 is inclined with respect to the first portion 10e1. Specifically, the second portion 10e2 extends toward the center in the length direction L of the device body 10 as it goes outward from the first portion 10e1 side.
　図２に示すように、第２の端面１０ｆも、第１の端面１０ｅと同様に、第３の部分１０ｆ１と、第４の部分１０ｆ２とを有する。第３の部分１０ｆ１は、幅方向Ｗ及び厚み方向Ｔに沿って延びている。第４の部分１０ｆ２は、第３の部分１０ｆ１の外側に位置している。第４の部分１０ｆ２は、第３の部分１０ｅ１と、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄとを接続している。第４の部分１０２は、第３の部分１０ｆ１に対して傾斜している。具体的は、第４の部分１０ｆ２は、第３の部分１０ｆ１側から外側にいくに従ってデバイス本体１０の長さ方向Ｌの中央側に向かって延びている。 As shown in FIG. 2, the second end surface 10f also has a third portion 10f1 and a fourth portion 10f2 in the same manner as the first end surface 10e. The third portion 10f1 extends along the width direction W and the thickness direction T. The fourth portion 10f2 is located outside the third portion 10f1. The fourth portion 10f2 connects the third portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d. The fourth portion 102 is inclined with respect to the third portion 10f1. Specifically, the fourth portion 10f2 extends toward the center side in the length direction L of the device body 10 as it goes outward from the third portion 10f1 side.
　図２に示すように、デバイス本体１０は、複数の第１の内部電極１１と、複数の第２の内部電極１２とを有する。第１及び第２の内部電極１１，１２は、厚み方向Ｔに沿って交互に設けられている。 As shown in FIG. 2, the device body 10 has a plurality of first internal electrodes 11 and a plurality of second internal electrodes 12. The first and second internal electrodes 11 and 12 are alternately provided along the thickness direction T.
　第１の内部電極１１は、第１及び第２の主面１０ａ、１０ｂと平行に設けられている。第１の内部電極１１の少なくとも一部は、第１の端面１０ｅに引き出されている。第１の内部電極１１は、第２の端面１０ｆ並びに第１及び第２の側面１０ｃ、１０ｄには引き出されていない。 The first internal electrode 11 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the first internal electrode 11 is drawn out to the first end face 10e. The first internal electrode 11 is not drawn out to the second end face 10f and the first and second side faces 10c, 10d.
　第１の内部電極１１は、第１の集電体１１ａと、第１の活物質層１１ｂ、１１ｃとを有する。第１の活物質層１１ｂ、１１ｃは、第１の集電体１１ａの少なくとも一方に設けられている。本実施形態では、第１の集電体１１ａの両面の上に、第１の活物質層１１ｂ、１１ｃが設けられている。 The first internal electrode 11 has a first current collector 11a and first active material layers 11b and 11c. The first active material layers 11b and 11c are provided on at least one of the first current collectors 11a. In the present embodiment, first active material layers 11b and 11c are provided on both surfaces of the first current collector 11a.
　第１の集電体１１ａは、例えば、アルミニウム、銅等の少なくとも一種の金属からなる金属箔により構成することができる。 The first current collector 11a can be made of a metal foil made of at least one metal such as aluminum or copper.
　第１の集電体１１ａの一方側の表面の上に第１の活物質層１１ｂが設けられており、他方側の表面の上に第１の活物質層１１ｃが設けられている。第１の活物質層１１ｂ、１１ｃは、蓄電デバイス１が電気二重層コンデンサを構成している場合には、分極性電極を構成する部材である。この場合、第１の活物質層１１ｂ、１１ｃは、活性炭などの炭素材料を含むことが好ましい。 A first active material layer 11b is provided on one surface of the first current collector 11a, and a first active material layer 11c is provided on the other surface. The first active material layers 11b and 11c are members that constitute a polarizable electrode when the electricity storage device 1 constitutes an electric double layer capacitor. In this case, it is preferable that the first active material layers 11b and 11c include a carbon material such as activated carbon.
　第２の内部電極１２は、第１及び第２の主面１０ａ、１０ｂと平行に設けられている。第２の内部電極１２の少なくとも一部は、第２の端面１０ｆに引き出されている。第２の内部電極１２は、第１の端面１０ｅ並びに第１及び第２の側面１０ｃ、１０ｄには引き出されていない。 The second internal electrode 12 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the second internal electrode 12 is drawn out to the second end face 10f. The second internal electrode 12 is not drawn out to the first end face 10e and the first and second side faces 10c, 10d.
　第２の内部電極１２は、第２の集電体１２ａと、第２の活物質層１２ｂ、１２ｃとを有する。第２の活物質層１２ｂ、１２ｃは、第２の集電体１２ａの少なくとも一方側の表面の上に設けられている。本実施形態では、第２の集電体１２ａの両面の上に、第２の活物質層１２ｂ、１２ｃが設けられている。 The second internal electrode 12 has a second current collector 12a and second active material layers 12b and 12c. The second active material layers 12b and 12c are provided on the surface of at least one side of the second current collector 12a. In the present embodiment, second active material layers 12b and 12c are provided on both surfaces of the second current collector 12a.
　第２の集電体１２ａは、例えば、アルミニウム、銅等の少なくとも一種の金属からなる金属箔により構成することができる。 The second current collector 12a can be made of a metal foil made of at least one metal such as aluminum or copper.
　第２の集電体１２ａの一方側の表面の上に第２の活物質層１２ｂが設けられており、他方側の表面の上に第２の活物質層１２ｃが設けられている。第２の活物質層１２ｂ、１２ｃは、蓄電デバイス１が電気二重層コンデンサを構成している場合には、分極性電極を構成する部材である。この場合、第２の活物質層１２ｂ、１２ｃは、活性炭などの炭素材料を含むことが好ましい。 The second active material layer 12b is provided on one surface of the second current collector 12a, and the second active material layer 12c is provided on the other surface. The second active material layers 12b and 12c are members constituting a polarizable electrode when the electricity storage device 1 constitutes an electric double layer capacitor. In this case, it is preferable that the second active material layers 12b and 12c include a carbon material such as activated carbon.
　第２の活物質層１２ｃは、第１の活物質層１１ｂと対向している。第２の活物質層１２ｂは、第１の活物質層１１ｃと対向している。 The second active material layer 12c is opposed to the first active material layer 11b. The second active material layer 12b is opposed to the first active material layer 11c.
　第１の活物質層１１ｂの上には、第１の電解質含有層１３ａが設けられている。第１の活物質層１１ｃの上には、第１の電解質含有層１３ｂが設けられている。第１の電解質含有層１３ａ、１３ｂは、第１の内部電極１１の上に設けられている。第１の電解質含有層１３ａ、１３ｂは、第２の端面１０ｆから隔離して設けられている。第２の活物質層１２ｂの上には、第２の電解質含有層１３ｃが設けられている。第２の活物質層１２ｃの上には、第２の電解質含有層１３ｄが設けられている。第２の電解質含有層１３ｃ、１３ｄは、第２の内部電極１２の上に設けられている。第２の電解質含有層１３ｃ、１３ｄは、第１の端面１０ｅから隔離して設けられている。 The first electrolyte containing layer 13a is provided on the first active material layer 11b. A first electrolyte-containing layer 13b is provided on the first active material layer 11c. The first electrolyte containing layers 13 a and 13 b are provided on the first internal electrode 11. The first electrolyte-containing layers 13a and 13b are provided separately from the second end face 10f. A second electrolyte-containing layer 13c is provided on the second active material layer 12b. A second electrolyte-containing layer 13d is provided on the second active material layer 12c. The second electrolyte containing layers 13 c and 13 d are provided on the second internal electrode 12. The second electrolyte-containing layers 13c and 13d are provided separately from the first end face 10e.
　なお、第１の電解質含有層と、第２の電解質含有層とは、一体に設けられていてもよい。すなわち、互いに隣接している第１の電解質含有層と第２の電解質含有層とが一体に設けられていてもよい。 Note that the first electrolyte-containing layer and the second electrolyte-containing layer may be provided integrally. That is, the first electrolyte-containing layer and the second electrolyte-containing layer that are adjacent to each other may be provided integrally.
　電解質含有層１３ａ、１３ｂ、１３ｃ、１３ｄは、それぞれ、電解質を含有している。電解質含有層１３ａ、１３ｂ、１３ｃ、１３ｄは、それぞれ、電解質を含有したゲルにより構成されていることが好ましい。ゲルとしては、例えば、高分子ポリエチレンオキサイド系樹脂等を用いることができる。 Electrolyte-containing layers 13a, 13b, 13c, and 13d each contain an electrolyte. The electrolyte-containing layers 13a, 13b, 13c, and 13d are each preferably composed of a gel containing an electrolyte. As the gel, for example, a high molecular polyethylene oxide resin or the like can be used.
　第１の活物質層１１ｂと、第２の活物質層１２ｃとは、第１の電解質含有層１３ａと第２の電解質含有層１３ｄとを介して対向している。第１の活物質層１１ｃと、第２の活物質層１２ｂとは、第１の電解質含有層１３ｂと第２の電解質含有層１３ｃとを介して対向している。 The first active material layer 11b and the second active material layer 12c are opposed to each other via the first electrolyte-containing layer 13a and the second electrolyte-containing layer 13d. The first active material layer 11c and the second active material layer 12b are opposed to each other via the first electrolyte-containing layer 13b and the second electrolyte-containing layer 13c.
　デバイス本体１０は、機能部１０Ａと、外装体１０Ｂとを有する。機能部１０Ａは、蓄電デバイスとしての機能を発現する部分である。機能部１０Ａは、上述した第１及び第２の内部電極１１，１２並びに電解質含有層１３ａ、１３ｂ、１３ｃ、１３ｄを備えている。 The device body 10 includes a functional unit 10A and an exterior body 10B. 10 A of functional parts are parts which express the function as an electrical storage device. The functional unit 10A includes the first and second internal electrodes 11 and 12 and the electrolyte-containing layers 13a, 13b, 13c, and 13d described above.
　外装体１０Ｂは、機能部１０Ａの外表面の一部を覆っている。具体的には、外装体１０Ｂは、機能部１０Ａの第１及び第２の主面並びに第１及び第２の側面を覆っている。機能部１０Ａの第１及び第２の端面は、外装体１０Ｂから露出している。従って、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄは、外装体１０Ｂにより構成されている。第１及び第２の端面１０ｅ、１０ｆは、機能部１０Ａと外装体１０Ｂとにより構成されている。 The exterior body 10B covers a part of the outer surface of the functional unit 10A. Specifically, the exterior body 10B covers the first and second main surfaces and the first and second side surfaces of the functional unit 10A. The first and second end faces of the functional unit 10A are exposed from the exterior body 10B. Accordingly, the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d are constituted by the exterior body 10B. The first and second end faces 10e, 10f are configured by a functional unit 10A and an exterior body 10B.
　第１の端面１０ｅの上には、第１の外部電極１８が設けられている。第１の外部電極１８は、第１の内部電極１１に電気的に接続されている。第１の外部電極１８は、第１の電極膜１８ａと、第１の金属キャップ１８ｂとを有する。 The first external electrode 18 is provided on the first end face 10e. The first external electrode 18 is electrically connected to the first internal electrode 11. The first external electrode 18 includes a first electrode film 18a and a first metal cap 18b.
　第１の電極膜１８ａは、第１の内部電極１１に接続されている。第１の電極膜１８ａは、第１の端面１０ｅを覆うように設けられている。詳細には、第１の電極膜１８ａは、第１の端面１０ｅの実質的に全体を覆っている。第１の電極膜１８ａは、第１の部分１０ｅ１から第２の部分１０ｅ２にまで至るように設けられている。第１の電極膜１８ａの端部は、第２の部分１０ｅ２の上に位置している。第１の電極膜１８ａは、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄの上には位置していない。 The first electrode film 18 a is connected to the first internal electrode 11. The first electrode film 18a is provided so as to cover the first end face 10e. Specifically, the first electrode film 18a covers substantially the entire first end face 10e. The first electrode film 18a is provided so as to extend from the first portion 10e1 to the second portion 10e2. The end portion of the first electrode film 18a is located on the second portion 10e2. The first electrode film 18a is not located on the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d.
　第１の金属キャップ１８ｂは、デバイス本体１０の第１の端面１０ｅ側の部分を覆っている。具体的には、第１の金属キャップ１８ｂは、第１の端面１０ｅと、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄのそれぞれの第１の端面１０ｅ側の部分を覆っている。 The first metal cap 18b covers a portion of the device body 10 on the first end face 10e side. Specifically, the first metal cap 18b includes the first end face 10e, the first end faces 10e of the first and second main faces 10a and 10b, and the first and second side faces 10c and 10d. Covers the side part.
　第１の金属キャップ１８ｂは、第１の電極膜１８ａに電気的に接続されている。 The first metal cap 18b is electrically connected to the first electrode film 18a.
　第２の端面１０ｆの上には、第２の外部電極１９が設けられている。第２の外部電極１９は、第２の内部電極１２に電気的に接続されている。第２の外部電極１９は、第２の電極膜１９ａと、第２の金属キャップ１９ｂとを有する。 A second external electrode 19 is provided on the second end face 10f. The second external electrode 19 is electrically connected to the second internal electrode 12. The second external electrode 19 includes a second electrode film 19a and a second metal cap 19b.
　第２の電極膜１９ａは、第２の内部電極１２に接続されている。第２の電極膜１９ａは、第２の端面１０ｆを覆うように設けられている。詳細には、第２の電極膜１９ａは、第２の端面１０ｆの実質的に全体を覆うように設けられている。第２の電極膜１９ａは、第３の部分１０ｆ１の上から第４の部分１０ｆ２の上にまで至るように設けられている。第２の電極膜１９ａの端部は、第４の部分１０ｆ２の上に位置している。第２の電極膜１９ａは、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄの上には位置していない。 The second electrode film 19 a is connected to the second internal electrode 12. The second electrode film 19a is provided so as to cover the second end face 10f. Specifically, the second electrode film 19a is provided so as to cover substantially the entire second end face 10f. The second electrode film 19a is provided so as to extend from the top of the third portion 10f1 to the top of the fourth portion 10f2. The end portion of the second electrode film 19a is located on the fourth portion 10f2. The second electrode film 19a is not located on the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d.
　第２の金属キャップ１９ｂは、デバイス本体１０の第２の端面１０ｆ側の部分を覆っている。具体的には、第２の金属キャップ１９ｂは、第２の端面１０ｅと、第１及び第２の主面１０ａ、１０ｂ並びに第１及び第２の側面１０ｃ、１０ｄのそれぞれの第２の端面１０ｆ側の部分を覆っている。 The second metal cap 19b covers the portion of the device body 10 on the second end face 10f side. Specifically, the second metal cap 19b includes the second end face 10e, the first and second main faces 10a and 10b, and the second end faces 10f of the first and second side faces 10c and 10d. Covers the side part.
　第２の金属キャップ１９ｂは、第２の電極膜１９ａに電気的に接続されている。 The second metal cap 19b is electrically connected to the second electrode film 19a.
　本実施形態では、第１及び第２の電極膜１８ａ、１９ａは、それぞれ、溶射膜により構成されている。第１及び第２の電極膜１８ａ、１９ａは、例えば、ＡｌやＡｌ合金等により構成することができる。 In the present embodiment, the first and second electrode films 18a and 19a are each formed of a sprayed film. The first and second electrode films 18a and 19a can be made of, for example, Al or an Al alloy.
　第１及び第２の金属キャップ１８ｂ、１９ｂは、それぞれ、例えば、Ｆｅ－Ｎｉ合金、Ｃｕ－Ｚｎ合金、Ｃｕ－Ｚｎ－Ｎｉ合金、Ａｌ等により構成することができる。第１及び第２の金属キャップ１８ｂ、１９ｂの外表面に、めっき膜が設けられていてもよい。めっき膜は、例えば、Ｎｉ／Ａｇめっき膜、Ｎｉ／Ａｕめっき膜、Ｎｉ／Ｓｎめっき膜等であってもよい。 The first and second metal caps 18b and 19b can be made of, for example, a Fe—Ni alloy, a Cu—Zn alloy, a Cu—Zn—Ni alloy, Al, or the like. Plating films may be provided on the outer surfaces of the first and second metal caps 18b and 19b. The plating film may be, for example, a Ni / Ag plating film, a Ni / Au plating film, a Ni / Sn plating film, or the like.
　ところで、蓄電デバイスの蓄電機能を高くする観点からは、第１及び第２の電解質含有層を大面積に設けることが好ましい。具体的には、特許文献１に記載されているように、第１の電解質含有層を第１の端面にまで至るように設けることが好ましい。第２の電解質含有層を第２の端面にまで至るように設けることが好ましい。しかしながら、その場合は、第１の電解質含有層に含有されていた電解質が第１の端面から漏洩する虞がある。第２の電解質含有層に含有されていた電解質が第２の端面から漏洩する虞がある。蓄電デバイス１では、第１の電解質含有層１３ａ、１３ｂと第１の端面１０ｅとを隔離する第１の隔離層１４ａ、１４ｂが設けられている。第２の電解質含有層１３ｃ、１３ｄと第２の端面１０ｆとを隔離する第２の隔離層１５ａ、１５ｂが設けられている。これら隔離層１４ａ、１４ｂ、１５ａ、１５ｂが設けられているため、電解質含有層１３ａ、１３ｂ、１３ｃ、１３ｄに含有されている電解質が端面１０ｅ、１０ｆから漏洩しにくい。従って、蓄電デバイス１は、優れた信頼性を有する。 By the way, from the viewpoint of increasing the power storage function of the power storage device, it is preferable to provide the first and second electrolyte-containing layers in a large area. Specifically, as described in Patent Document 1, it is preferable to provide the first electrolyte-containing layer so as to reach the first end face. It is preferable to provide the second electrolyte-containing layer so as to reach the second end face. However, in that case, the electrolyte contained in the first electrolyte-containing layer may leak from the first end face. There is a possibility that the electrolyte contained in the second electrolyte-containing layer may leak from the second end face. In the electricity storage device 1, first isolation layers 14a and 14b that isolate the first electrolyte-containing layers 13a and 13b and the first end face 10e are provided. Second isolation layers 15a and 15b are provided to isolate the second electrolyte-containing layers 13c and 13d from the second end face 10f. Since these isolation layers 14a, 14b, 15a, and 15b are provided, the electrolyte contained in the electrolyte-containing layers 13a, 13b, 13c, and 13d is unlikely to leak from the end faces 10e and 10f. Therefore, the electricity storage device 1 has excellent reliability.
　また、蓄電デバイス１では、第１の電解質含有層１３ａ、１３ｂと第２の端面１０ｆとを隔離する第３の隔離層１６ａ、１６ｂが設けられている。第２の電解質含有層１３ｃ、１３ｄと第１の端面１０ｅとを隔離する第４の隔離層１７ａ、１７ｂが設けられている。これら隔離層１６ａ、１６ｂ、１７ａ、１７ｂが設けられているため、電解質含有層１３ａ、１３ｂ、１３ｃ、１３ｄに含有されている電解質が端面１０ｅ、１０ｆから漏洩しにくい。従って、蓄電デバイス１は、より優れた信頼性を有する。 Further, in the electricity storage device 1, third isolation layers 16a and 16b that isolate the first electrolyte-containing layers 13a and 13b and the second end face 10f are provided. Fourth isolation layers 17a and 17b for isolating the second electrolyte-containing layers 13c and 13d and the first end face 10e are provided. Since these isolation layers 16a, 16b, 17a, and 17b are provided, the electrolyte contained in the electrolyte containing layers 13a, 13b, 13c, and 13d is unlikely to leak from the end faces 10e and 10f. Therefore, the electricity storage device 1 has more excellent reliability.
　隔離層１４ａ、１４ｂ、１５ａ、１５ｂ、１６ａ、１６ｂ、１７ａ、１７ｂは、電解質を透過させない材料により構成されていることが好ましい。隔離層１４ａ、１４ｂ、１５ａ、１５ｂ、１６ａ、１６ｂ、１７ａ、１７ｂは、例えば、樹脂層により構成されていることが好ましい。隔離層１４ａ、１４ｂ、１５ａ、１５ｂ、１６ａ、１６ｂ、１７ａ、１７ｂは、例えば、アクリル樹脂と、シリカなどのフィラーとを含む樹脂組成物により構成されていることが好ましい。 The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a material that does not allow electrolyte to permeate. The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably constituted by, for example, a resin layer. The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a resin composition containing, for example, an acrylic resin and a filler such as silica.
　本実施形態では、第１の内部電極１１のうち、第１の集電体層１１ａのみが第１の隔離層１４ａ、１４ｂにより分断されずに第１の端面１０ｅに至っている。第１の活物質層１１ｂ、１１ｃは、第１の隔離層１４ａ、１４ｂにより第１の端面１０ｅ側の部分と、第２の端面１０ｆ側の部分とに分断されている。第１の活物質層１１ｂ、１１ｃの第１の端面１０ｅ側の部分は、第１の端面１０ｅに至っている。第１の活物質層１１ｂ、１１ｃが活性炭等により構成されている場合は、第１の活物質層１１ｂ、１１ｃと溶射膜１８ａとの密着強度が高い。このため、第１の活物質層１１ｂ、１１ｃの第１の端面１０ｅ側の部分を第１の端面１０ｅにまで至るように設けることにより第１の内部電極１１と第１の外部電極１８との密着強度を高めることができる。 In the present embodiment, among the first internal electrodes 11, only the first current collector layer 11a reaches the first end face 10e without being divided by the first isolation layers 14a and 14b. The first active material layers 11b and 11c are divided into a portion on the first end face 10e side and a portion on the second end face 10f side by the first isolation layers 14a and 14b. Portions on the first end face 10e side of the first active material layers 11b and 11c reach the first end face 10e. When the first active material layers 11b and 11c are made of activated carbon or the like, the adhesion strength between the first active material layers 11b and 11c and the sprayed film 18a is high. For this reason, by providing the first active material layers 11b and 11c on the first end face 10e side so as to reach the first end face 10e, the first inner electrode 11 and the first outer electrode 18 The adhesion strength can be increased.
　蓄電デバイス１では、第２の内部電極１２のうち、第２の集電体層１２ａのみが第２の隔離層１５ａ、１５ｂにより分断されずに第２の端面１０ｆに至っている。第２の活物質層１２ｂ、１２ｃは、第２の隔離層１５ａ、１５ｂにより第１の端面１０ｅ側の部分と、第２の端面１０ｆ側の部分とに分断されている。第２の活物質層１２ｂ、１２ｃの第２の端面１０ｆ側の部分は、第２の端面１０ｆに至っている。第２の活物質層１２ｂ、１２ｃが活性炭等により構成されている場合は、第２の活物質層１２ｂ、１２ｃと溶射膜１８ａとの密着強度が高い。このため、第２の活物質層１２ｂ、１２ｃの第２の端面１０ｆ側の部分を第２の端面１０ｆにまで至るように設けることにより第２の内部電極１２と第２の外部電極１９との密着強度を高めることができる。 In the electricity storage device 1, of the second internal electrodes 12, only the second current collector layer 12a reaches the second end face 10f without being divided by the second isolation layers 15a and 15b. The second active material layers 12b and 12c are divided by the second isolation layers 15a and 15b into a part on the first end face 10e side and a part on the second end face 10f side. Portions on the second end face 10f side of the second active material layers 12b and 12c reach the second end face 10f. When the second active material layers 12b and 12c are made of activated carbon or the like, the adhesion strength between the second active material layers 12b and 12c and the sprayed film 18a is high. Therefore, by providing the second active material layers 12b and 12c on the second end face 10f side so as to reach the second end face 10f, the second internal electrode 12 and the second external electrode 19 The adhesion strength can be increased.
　蓄電デバイス１では、デバイス本体１０のうち、長さ方向Ｌにおいて第１の隔離層１４ａ、１４ｂよりも第１の端面１０ｅ側に位置する部分と、第２の隔離層１５ａ、１５ｂよりも第２の端面１０ｆ側に位置する部分とのそれぞれにおいて、第１の内部電極１１と第２の内部電極１２との間に充填層２０が設けられている。このため、デバイス本体１０のうち、長さ方向Ｌにおいて第１の隔離層１４ａ、１４ｂよりも第１の端面１０ｅ側の位置する部分、及び第２の隔離層１５ａ、１５ｂよりも第２の端面１０ｆ側に位置する部分のそれぞれの厚みと、デバイス本体１０のそれ以外の部分の厚みとの差が小さくされている。このため、蓄電デバイス１の製造工程において、集電体１１ａ、１２ａ等の断線等が生じ難い。また、デバイス本体１０内に異物の混入が生じ難い。従って、優れた信頼性を有する蓄電デバイス１を容易に製造し得る。 In the electricity storage device 1, a part of the device body 10 that is located closer to the first end face 10e side than the first isolation layers 14a and 14b in the length direction L, and a second level than the second isolation layers 15a and 15b. A filling layer 20 is provided between the first internal electrode 11 and the second internal electrode 12 in each of the portions located on the end face 10 f side. Therefore, a part of the device body 10 that is located on the first end surface 10e side with respect to the first isolation layers 14a and 14b in the length direction L, and a second end surface with respect to the second isolation layers 15a and 15b. The difference between the thickness of each part located on the 10f side and the thickness of the other part of the device body 10 is reduced. For this reason, in the manufacturing process of the electrical storage device 1, disconnection etc. of the collectors 11a and 12a etc. are hard to occur. Further, it is difficult for foreign matter to enter the device body 10. Therefore, the electricity storage device 1 having excellent reliability can be easily manufactured.
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１の実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、説明を省略する。 Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.
　（第２の実施形態）
　図４は、第２の実施形態に係る蓄電デバイス１ａの模式的断面図である。 (Second Embodiment)
FIG. 4 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
　本実施形態に係る蓄電デバイス１ａは、第３の隔離層１６ａ、１６ｂが第１の端面１０ｅにまで至っており、第４の隔離層１７ａ、１７ｂが第２の端面１０ｆにまで至っており、充填層２０が設けられていない点において第１の実施形態に係る蓄電デバイス１と異なる。 In the electricity storage device 1a according to the present embodiment, the third isolation layers 16a and 16b reach the first end face 10e, the fourth isolation layers 17a and 17b reach the second end face 10f, and the filling layer It differs from the electrical storage device 1 according to the first embodiment in that 20 is not provided.
　蓄電デバイス１ａにおいても、隔離層１４ａ、１４ｂ、１５ａ、１５ｂ、１６ａ、１６ｂ、１７ａ、１７ｂが設けられているため、デバイス本体１０からの電解質の漏洩を効果的に抑制することができる。 Also in the electricity storage device 1a, since the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are provided, leakage of the electrolyte from the device body 10 can be effectively suppressed.
　なお、本実施形態では、第１の隔離層１４ａ、１４ｂが第１の端面１０ｅに至っておらず、第２の隔離層１５ａ、１５ｂが第２の端面１０ｆに至っていない例について説明するが、第１の隔離層１４ａ、１４ｂが第１の端面１０ｅに至っており、第２の隔離層１５ａ、１５ｂが第２の端面１０ｆに至っていてもよい。 In the present embodiment, an example in which the first isolation layers 14a and 14b do not reach the first end face 10e and the second isolation layers 15a and 15b do not reach the second end face 10f will be described. One isolation layer 14a, 14b may reach the first end face 10e, and the second isolation layer 15a, 15b may reach the second end face 10f.
　（第３の実施形態）
　図５は、第３の実施形態に係る蓄電デバイス１ｂの模式的断面図である。 (Third embodiment)
FIG. 5 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
　本実施形態に係る蓄電デバイス１ｂは、充填層２０が設けられている点で第２の実施形態に係る蓄電デバイス１ａと異なる。 The power storage device 1b according to the present embodiment is different from the power storage device 1a according to the second embodiment in that the filling layer 20 is provided.
　蓄電デバイス１ｂにおいても、隔離層１４ａ、１４ｂ、１５ａ、１５ｂ、１６ａ、１６ｂ、１７ａ、１７ｂが設けられているため、デバイス本体１０からの電解質の漏洩を効果的に抑制することができる。 Also in the electricity storage device 1b, since the isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are provided, leakage of the electrolyte from the device body 10 can be effectively suppressed.
　また、蓄電デバイス１ｂにおいては、充填層２０が設けられているため、製造時において、集電体層１１ａ、１２ａの断線等を効果的に抑制することができる。従って、優れた信頼性の蓄電デバイス１ｂを効率的に製造することができる。 In addition, since the power storage device 1b is provided with the filling layer 20, it is possible to effectively suppress disconnection of the current collector layers 11a and 12a at the time of manufacture. Accordingly, it is possible to efficiently manufacture the electricity storage device 1b having excellent reliability.
１、１ａ、１ｂ　蓄電デバイス
１０　デバイス本体
１０Ａ　機能部
１０Ｂ　外装体
１０ａ　第１の主面
１０ｂ　第２の主面
１０ｃ　第１の側面
１０ｄ　第２の側面
１０ｅ　第１の端面
１０ｅ１　第１の部分
１０ｅ２　第２の部分
１０ｆ　第２の端面
１０ｆ１　第３の部分
１０ｆ２　第４の部分
１１　第１の内部電極
１１ａ　第１の集電体
１１ｂ，１１ｃ　第１の活物質層
１２　第２の内部電極
１２ａ　第２の集電体
１２ｂ，１２ｃ　第２の活物質層
１３ａ，１３ｂ　第１の電解質含有層
１３ｃ，１３ｄ　第２の電解質含有層
１４ａ、１４ｂ　第１の隔離層
１５ａ、１５ｂ　第２の隔離層
１６ａ、１６ｂ　第３の隔離層
１７ａ、１７ｂ　第４の隔離層
１８　第１の外部電極
１８ａ　第１の電極膜
１８ｂ　第１の金属キャップ
１９　第２の外部電極
１９ａ　第２の電極膜
１９ｂ　第２の金属キャップ
２０　充填層 1, 1a, 1b Power storage device 10 Device body 10A Functional unit 10B Exterior body 10a First main surface 10b Second main surface 10c First side surface 10d Second side surface 10e First end surface 10e1 First portion 10e2 First Second portion 10f second end face 10f1 third portion 10f2 fourth portion 11 first internal electrode 11a first current collector 11b, 11c first active material layer 12 second internal electrode 12a second Current collectors 12b, 12c Second active material layers 13a, 13b First electrolyte-containing layers 13c, 13d Second electrolyte-containing layers 14a, 14b First isolation layers 15a, 15b Second isolation layers 16a, 16b 3rd isolation layer 17a, 17b 4th isolation layer 18 1st external electrode 18a 1st electrode film 18b 1st metal cap 19 2nd external electrode 19a 2nd electrode film 19b 2nd metal key -Up 20 filling layer

Claims (7)

  1. 　長さ方向及び幅方向に沿って延びる第１及び第２の主面と、前記長さ方向及び厚み方向に沿って延びる第１及び第２の側面と、一部が前記幅方向及び前記厚み方向に沿って延びる第１及び第２の端面とを有するデバイス本体と、
    　前記デバイス本体の上に設けられた第１の外部電極と、
    　前記デバイス本体の上に設けられた第２の外部電極と、
    　を備え、
    　前記デバイス本体は、
    　第１の集電体と、前記第１の集電体の両面の少なくとも一方の上に設けられた第１の活物質層とを有し、前記第１の集電体及び前記第１の活物質層のうちの少なくとも前記第１の集電体が前記第１の端面に引き出された第１の内部電極と、
    　第２の集電体と、前記第２の集電体の両面の少なくとも一方の上に設けられた第２の活物質層とを有し、前記第２の集電体及び前記第２の活物質層のうちの少なくとも前記第２の集電体が前記第２の端面に引き出された第２の内部電極と、
    　前記第１の活物質層及び前記第２の活物質層との間に、前記第１の端面及び前記第２の端面から隔離して設けられており、電解質を含有している電解質含有層と、
    　前記電解質含有層と前記第１の端面とを隔離するように設けられた第１の隔離層と、　前記電解質含有層と前記第２の端面とを隔離するように設けられた第２の隔離層と、　を備える、蓄電デバイス。     First and second main surfaces extending along the length direction and the width direction, first and second side surfaces extending along the length direction and the thickness direction, and a part thereof in the width direction and the thickness direction A device body having first and second end faces extending along
    A first external electrode provided on the device body;
    A second external electrode provided on the device body;
    With
    The device body is
    A first active material layer provided on at least one of both surfaces of the first current collector, the first current collector and the first active material layer; A first internal electrode in which at least the first current collector of the material layer is drawn out to the first end surface;
    A second active material layer provided on at least one of both surfaces of the second current collector, and the second current collector and the second active material layer. A second internal electrode in which at least the second current collector of the material layer is drawn out to the second end face;
    An electrolyte-containing layer that is provided between the first active material layer and the second active material layer and is isolated from the first end surface and the second end surface; ,
    A first isolation layer provided to isolate the electrolyte-containing layer and the first end surface; and a second isolation layer provided to isolate the electrolyte-containing layer and the second end surface. An electricity storage device comprising:
  2. 　前記第１の隔離層が前記第１の端面から隔離しており、
    　前記第１の活物質層が、前記第１の隔離層から前記第１の端面に至るように設けられており、
    　前記第２の隔離層が前記第２の端面から隔離しており、
    　前記第２の活物質層が、前記第２の隔離層から前記第２の端面に至るように設けられている、請求項１に記載の蓄電デバイス。     The first isolation layer is isolated from the first end face;
    The first active material layer is provided so as to reach the first end face from the first isolation layer;
    The second isolation layer is isolated from the second end face;
    The electricity storage device according to claim 1, wherein the second active material layer is provided so as to reach the second end face from the second isolation layer.
  3. 　前記デバイス本体のうち前記第１の隔離層よりも前記第１の端面側に位置する部分において、前記第１の内部電極と前記第２の内部電極との間に設けられた第１の充填層と、　前記デバイス本体のうち前記第２の隔離層よりも前記第２の端面側に位置する部分において、前記第１の内部電極と前記第２の内部電極との間に設けられた第２の充填層と、
    　をさらに備える、請求項１または２に記載の蓄電デバイス。     A first filling layer provided between the first internal electrode and the second internal electrode in a portion of the device body located closer to the first end face than the first isolation layer. And a second portion provided between the first internal electrode and the second internal electrode in a portion of the device body located on the second end face side of the second isolation layer. A packed bed;
    The electricity storage device according to claim 1, further comprising:
  4. 　前記第１及び第２の隔離層が、樹脂層である、請求項１～３のいずれか一項に記載の蓄電デバイス。 The electricity storage device according to any one of claims 1 to 3, wherein the first and second isolation layers are resin layers.
  5. 　前記樹脂層がアクリル樹脂を含む、請求項４に記載の蓄電デバイス。 The electric storage device according to claim 4, wherein the resin layer includes an acrylic resin.
  6. 　前記第１及び第２の外部電極のそれぞれは、
    　前記第１又は第２の端面を覆う溶射膜と、
    　前記溶射膜を覆う金属キャップと、
    　を有する、請求項１～５のいずれか一項に記載の蓄電デバイス。     Each of the first and second external electrodes is:
    A sprayed coating covering the first or second end face;
    A metal cap covering the sprayed coating;
    The electricity storage device according to any one of claims 1 to 5, wherein
  7. 　前記電解質含有層が、前記電解質を含むゲルにより構成されている、請求項１～６のいずれか一項に記載の蓄電デバイス。 The electricity storage device according to any one of claims 1 to 6, wherein the electrolyte-containing layer is composed of a gel containing the electrolyte.
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