WO2018235398A1 - Electricity storage device - Google Patents

Electricity storage device Download PDF

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Publication number
WO2018235398A1
WO2018235398A1 PCT/JP2018/015091 JP2018015091W WO2018235398A1 WO 2018235398 A1 WO2018235398 A1 WO 2018235398A1 JP 2018015091 W JP2018015091 W JP 2018015091W WO 2018235398 A1 WO2018235398 A1 WO 2018235398A1
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Prior art keywords
layer
face
adhesion
active material
exposed
Prior art date
Application number
PCT/JP2018/015091
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French (fr)
Japanese (ja)
Inventor
広貴 堀口
将之 神頭
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株式会社村田製作所
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Publication of WO2018235398A1 publication Critical patent/WO2018235398A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
    • H01G11/66—Current collectors
    • H01G11/72—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, LIGHT-SENSITIVE OR TEMPERATURE-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
    • 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
    • H01M10/05—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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
    • H01M50/50—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
    • 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 an example of a storage device.
  • the main object of the present invention is to provide an electricity storage device having high connection reliability between an internal electrode and an external electrode.
  • An electricity storage device includes a device body, a first external electrode, and a second external electrode.
  • the device body has first and second major surfaces, first and second side surfaces, and first and second end surfaces.
  • the first and second major surfaces extend in the longitudinal direction and the width direction.
  • the first and second side surfaces extend in the longitudinal direction and the thickness direction.
  • the first and second end surfaces extend in 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 has a first internal electrode, a second internal electrode, an electrolyte layer, and an insulating layer.
  • the first inner electrode extends along the length direction and the width direction.
  • the first inner electrode has a first current collector and a first active material layer.
  • the first current collector is exposed at the first end face.
  • the first active material layer is provided on the first current collector.
  • the second inner electrode is stacked in the thickness direction with respect to the first inner electrode.
  • the second inner electrode has a second current collector and a second active material layer.
  • the second current collector is exposed at the second end face.
  • the second active material layer is provided on the second current collector.
  • the electrolyte layer is disposed between the first active material layer and the second active material layer.
  • the insulating layer separates the first current collector and the electrolyte layer from the second end face.
  • the insulating layer separates the second current collector and the electrolyte layer from the first end face.
  • the insulating layer is provided to surround the electrolyte layer.
  • the first external electrode has a first sprayed film provided on the first end face.
  • the second external electrode has a second sprayed film provided on the second end face.
  • the device body further includes a first adhesion layer and a second adhesion layer.
  • the first adhesion layer has higher adhesion to the first sprayed film than the insulating layer.
  • the first adhesion layer is exposed at the first end face.
  • the second adhesion layer has higher adhesion to the second sprayed film than the insulating layer.
  • the second adhesion layer is exposed at the second end face.
  • a first recess extending inward in the longitudinal direction is provided on the surface exposed to the first end face of the first adhesive layer.
  • a second recess extending inward in the longitudinal direction is provided on the surface exposed to the second end face of the second adhesive layer.
  • the first sprayed film is in the first recess.
  • the second sprayed film is in the second recess.
  • the first adhesion layer having higher adhesion to the first sprayed film than the insulating layer is provided. Therefore, the adhesion strength between the first sprayed film and the device body is higher than in the case where the first adhesion layer is not provided.
  • the first adhesive layer is provided with a first recess extending inward in the longitudinal direction from the end face of the first adhesive layer. The first sprayed film is intruding into the first recess. Therefore, the bonding area between the first adhesion layer and the first sprayed film is large. Thus, the adhesion between the device body and the first sprayed film is further enhanced. Therefore, the first sprayed film is less likely to peel off from the device body. For this reason, it is difficult for the first sprayed film to be peeled off from the first internal electrode. Therefore, in the electricity storage device according to the present invention, the connection reliability between the first outer electrode and the first inner electrode is high.
  • a second adhesion layer having higher adhesion to the second sprayed film than the insulating layer is provided. For this reason, the adhesion strength between the second sprayed film and the device body is higher than when the second adhesion layer is not provided.
  • the second adhesive layer is provided with a second recess extending inward in the length direction from the end face of the second adhesive layer. The second sprayed film is intruding into the second recess. Therefore, the bonding area between the second adhesion layer and the second sprayed film is large. Thus, the adhesion between the device body and the second sprayed film is further enhanced.
  • the second sprayed film is less likely to be peeled off from the device body. Therefore, the second sprayed film is less likely to be peeled off from the second internal electrode. Therefore, in the electricity storage device according to the present invention, the connection reliability between the second outer electrode and the second inner electrode is high.
  • the connection reliability of an external electrode and an internal electrode is high.
  • the first adhesion layer is provided on the first current collector, and the first recess is a first end face side in the length direction of the first current collector.
  • the end portion is provided so as to be exposed from the first adhesion layer
  • the second adhesion layer is provided on the second current collector
  • the second recess is provided for the second current collector. It is preferable that a second end face side end in the longitudinal direction be provided so as to be exposed from the second adhesion layer.
  • the first adhesion layer includes the portion located at the same position as the first active material layer in the thickness direction, and the first adhesion layer and the first active material layer Are made of the same material
  • the second adhesion layer includes a portion located at the same position as the second active material layer in the thickness direction, and the second adhesion layer and the second active layer It is preferable that the material layer and the material layer be made of the same material.
  • the device body has higher adhesion to the first sprayed film than the insulating layer, and the third adhesive layer exposed at the first end face and the third adhesion layer It may have high adhesion to the thermal spray coating of No. 2 and further have a fourth adhesion layer exposed at the second end face.
  • a third recess extending inward in the longitudinal direction is provided on the surface exposed to the first end face of the third adhesive layer, and exposed to the second end surface of the fourth adhesive layer.
  • the fourth concave portion extending inward in the length direction is provided in the surface where the third thermal spray coating is in the third concave, and the fourth thermal spray coating is in the fourth concave.
  • the third adhesion layer includes a portion located at the same position as the second active material layer in the thickness direction, and the third adhesion layer and the second active material layer are the same. It is made of a material, and the fourth adhesion layer includes a portion located at the same position as the first active material layer in the thickness direction, and the fourth adhesion layer and the first active material layer Are preferably made of the same material.
  • each of the adhesion layers is preferably a porous layer.
  • each of the adhesion layers preferably contains at least one particle selected from the group consisting of carbon particles, carbon compound particles, metal particles and metal oxide particles.
  • each of the first and second current collectors is preferably made of a metal foil.
  • the insulating layer is preferably exposed to the first and second end faces.
  • FIG. 1 is a schematic perspective view of a power storage device according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
  • FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG.
  • FIG. 1 is a schematic perspective view of a power storage device according to the present embodiment.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
  • the power storage device 1 shown in FIGS. 1 to 3 is, for example, a device that constitutes an electric double layer capacitor or a secondary battery.
  • the storage device 1 includes a device body 10.
  • the device body 10 is provided in a rectangular shape.
  • the device body 10 has first and second main surfaces 10a1 and 10b1, first and second side surfaces 10c1 and 10d1 (see FIG. 3), and first and second end surfaces 10e1 and 10f1 (FIG. 2). See)).
  • the first and second major surfaces 10a1 and 10b1 extend along the length direction L and the width direction W.
  • the first major surface 10a1 and the second major surface 10b1 are opposed in the thickness direction T.
  • the first and second side surfaces 10 c 1 and 10 d 1 extend along the length direction L and the thickness direction T.
  • the first side surface 10c1 and the second side surface 10d1 face each other in the width direction W.
  • the first and second end faces 10 e 1 and 10 f 1 extend in the width direction W and the thickness direction T.
  • the first end face 10e1 and the second end face 10f1 are opposed in the length direction L.
  • the device body 10 includes a functional unit 10A and an exterior body 10B.
  • the functional unit 10A is a portion at least a part of which exhibits a function as a power storage device.
  • the functional unit 10A is provided in a rectangular shape.
  • the functional unit 10A has first and second main surfaces 10a2 and 10b2, first and second side surfaces 10c2 and 10d2 (see FIG. 3), and first and second end surfaces 10e2 and 10f2 (FIG. 2). See)).
  • the first and second major surfaces 10a2 and 10b2 extend along the length direction L and the width direction W.
  • the first major surface 10a2 and the second major surface 10b2 face each other in the thickness direction T.
  • the first and second side surfaces 10 c 2 and 10 d 2 extend along the length direction L and the thickness direction T.
  • the first side surface 10c2 and the second side surface 10d2 face each other in the width direction W.
  • the first and second end faces 10 e 2 and 10 f 2 extend in the width direction W and the thickness direction T.
  • the first end face 10e2 and the second end face 10f2 face each other in the length direction L.
  • the first end face 10e2 of the functional unit 10A constitutes a part excluding the part of the first end face 10e1 of the device body 10, specifically, the part formed of the exterior body 10B.
  • the second end face 10f2 of the functional unit 10A constitutes a part of the second end face 10f1 of the device body 10, specifically, a part excluding the part formed by the exterior body 10B.
  • the “cuboid shape” includes a rectangular shape having a chamfered shape or a rounded shape at a corner portion or a ridge portion.
  • the functional unit 10 ⁇ / b> A includes a first inner electrode 11, a second inner electrode 12, and an electrolyte layer 13.
  • the first inner electrode 11 extends along the length direction L and the width direction W.
  • the first inner electrode 11 is provided in parallel to the first and second main surfaces 10a2 and 10b2 of the functional unit 10A.
  • the first inner electrode 11 has a first current collector 11a and a first active material layer 11b.
  • the first current collector 11a is drawn out to the first end faces 10e1 and 10e2.
  • the first current collector 11a is exposed at the first end faces 10e1 and 10e2.
  • the first current collector 11a is not drawn out to the first and second side faces 10c2 and 10d2 and the second end faces 10f1 and 10f2.
  • the first current collector 11a can be made of, for example, a metal foil made of at least one metal such as aluminum and copper.
  • metal includes alloys.
  • a first active material layer 11 b is provided on the surface on one side of the first current collector 11 a.
  • the first active material layer 11 b contains an active material.
  • the first active material layer 11 b constitutes a polarizable electrode.
  • the first active material layer 11b as the polarizable electrode contains, for example, a carbon material such as activated carbon as an active material.
  • the second inner electrode 12 extends along the length direction L and the width direction W.
  • the second inner electrode 12 is provided in parallel to the first and second main surfaces 10a2 and 10b2 of the functional unit 10A.
  • the second inner electrode 12 includes a second current collector 12a and a second active material layer 12b.
  • the second current collector 12a is drawn to the second end faces 10f1 and 10f2, and exposed to the second end faces 10f1 and 10f2.
  • the second current collector 12a is not drawn out to the first and second side faces 10c2 and 10d2 and the first end face 10e1 and 10e2.
  • the second inner electrode 12 is stacked in the thickness direction T with respect to the first inner electrode 11.
  • the portion excluding the second end face 10 f 1, 10 f 2 side end portion is the portion of the first current collector 11 a of the first inner electrode 11, It faces in the thickness direction T a portion excluding the first end face 10e1 and 10e2 side end.
  • the second current collector 12a can be made of, for example, a metal foil made of at least one metal such as aluminum and copper.
  • the second active material layer 12 b is provided on the surface of the second current collector 12 a on the first inner electrode 11 side. Therefore, the second active material layer 12 b is opposed to the first active material layer 11 b in the thickness direction T.
  • the second active material layer 12 b contains an active material.
  • the second active material layer 12 b constitutes a polarizable electrode.
  • the second active material layer 12 b as the polarizable electrode contains, for example, a carbon material such as activated carbon as an active material.
  • An electrolyte layer 13 is provided between the first active material layer 11 b of the first inner electrode 11 and the second active material layer 12 b of the second inner electrode 12.
  • the electrolyte layer 13 is a layer containing an electrolyte.
  • the electrolyte layer 13 may be constituted by a gel electrolyte which is a gel electrolyte, or may be constituted by a porous body such as a separator impregnated with an electrolytic solution.
  • a gel electrolyte high molecular polyethylene oxide containing an electrolyte etc. are mentioned, for example.
  • electrolyte examples include, for example, ionic liquids such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or And those obtained by dissolving the ionic liquid in an organic solvent such as propylene carbonate and acetonitrile. Only one of these electrolytes may be used, or a plurality of types may be mixed and used.
  • ionic liquids such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or And those obtained by dissolving the ionic liquid in an organic solvent such as propylene carbonate and acetonitrile. Only one of these electrolytes may be used, or a plurality of types may be
  • the electrolyte layer 13 has a first electrolyte layer 13a and a second electrolyte layer 13b.
  • the first electrolyte layer 13a is provided on the first active material layer 11b.
  • the second electrolyte layer 13 b is provided on the second active material layer 12 b.
  • the first electrolyte layer 13a and the second electrolyte layer 13b are in contact with each other so that the electrolytes can move relative to each other. It is preferable that the first electrolyte layer 13a and the second electrolyte layer 13b be in close contact with each other.
  • first current collector 11a of the first inner electrode 11 is exposed to the first end face 10e2 (see FIG. 2).
  • the second current collector 12 a is exposed to the second end face 10 f 2.
  • the first active material layer 11b of the first inner electrode 11, the second active material layer 12b of the second inner electrode 12, and the electrolyte layer 13 are not exposed to the first and second end faces 10e2 and 10f2. .
  • An insulating layer 15 is provided between the first and second active material layers 11 b and 12 b and the electrolyte layer 13 and the first end faces 10 e 1 and 10 e 2. Specifically, as shown in FIG. 4, the insulating layer 15 separates the first current collector 11a and the electrolyte layer 13 from the second end faces 10f1 and 10f2, and the second current collector 12a. And the electrolyte layer 13 is provided so as to separate the electrolyte layer 13 from the first end faces 10e1 and 10e2.
  • the insulating layer 15 has a first insulating layer 15 a and a second insulating layer 15 b.
  • the first active material layer 11 b and the first electrolyte layer 13 a are separated from the first end faces 10 e 1 and 10 e 2 by the first insulating layer 15 a.
  • the second active material layer 12 b and the second electrolyte layer 13 b are separated from the second end faces 10 f 1 and 10 f 2 by the second insulating layer 15 b.
  • the first active material layer 11b and the first electrolyte layer 13a are separated from the first and second side surfaces 10d by the first insulating layer 15a. That is, the first insulating layer 15a includes the first and second end faces 10e1, 10e2, 10f1, and 10f2 of the first active material layer 11b and the first electrolyte layer 13a, and the first and second side surfaces 10c, It is provided to cover the 10d side.
  • the second insulating layer 15b isolates the second active material layer 11b and the second electrolyte layer 13b from the first and second side surfaces 10c and 10d. That is, the second insulating layer 15b covers the first and second end faces 10e and 10f of the second active material layer 11b and the second electrolyte layer 13b and the first and second side surfaces 10c and 10d. It is provided as.
  • the insulating layer 15 can be made of, for example, a urethane resin, an acrylic resin, an epoxy resin, a polyimide resin, a silicone resin, or the like.
  • the power storage device 1 has first and second adhesion layers 14 a and 14 b.
  • the storage device 1 further includes third and fourth adhesion layers 14c and 14d.
  • the electricity storage device may include only the first and second adhesion layers, and may not include the third and fourth adhesion layers.
  • the first adhesion layer 14a is provided on the first current collector 11a. Specifically, the first adhesion layer 14a is provided on the outer side in the length direction L of the first insulating layer 15a. The first adhesion layer 14 a has a portion provided at the same position as the first active material layer 11 b in the stacking direction T. The first adhesion layer 14a is exposed at the first end faces 10e1 and 10e2.
  • the second adhesion layer 14 b is provided on the second current collector 12 a. Specifically, the second adhesion layer 14 b is provided outside in the length direction L of the first insulating layer 15 a. The second adhesion layer 14 b has a portion provided at the same position as the second active material layer 12 b in the stacking direction T. The second adhesion layer 14 b is exposed at the second end faces 10 f 1 and 10 f 2.
  • the third adhesion layer 14c is provided on the outer side in the length direction L of the second insulating layer 15b.
  • the third adhesion layer 14 c has a portion provided in the same position as the second active material layer 12 b in the stacking direction T.
  • the third adhesion layer 14c is exposed at the first end faces 10e1 and 10e2.
  • the fourth adhesive layer 14d is provided on the outer side in the length direction L of the second insulating layer 15b.
  • the fourth adhesive layer 14 d has a portion provided at the same position as the second active material layer 12 b in the stacking direction T.
  • the fourth adhesion layer 14d is exposed at the second end faces 10f1 and 10f2.
  • the first and third adhesion layers 14a and 14c can be made of, for example, the same material as the first active material layer 11b.
  • first and third adhesion layers 14a and 14c are made of the same material as the first active material layer 11b, the first and third adhesion layers 14a and 14c, and the first active material layer 11b and Can be configured in the same step.
  • the second and fourth adhesion layers 14b and 14d can be made of, for example, the same material as the second active material layer 12b.
  • the second and fourth adhesion layers 14b and 14d are made of the same material as the second active material layer 12b, the second and fourth adhesion layers 14b and 14d, and the second active material layer 12b and Can be formed in the same step.
  • the pair of first and second internal electrodes 11 and 12, the electrolyte layer 13, the insulating layer 15, and the first to fourth adhesion layers 14a to 14d constitute one electricity storage unit 17. doing.
  • a plurality of storage units 17 are stacked, and the stack of the plurality of storage units 17 constitutes the functional unit 10A.
  • the storage units 17 adjacent in the stacking direction T are bonded by the adhesive layer 16. Further, the storage units 17 located in the uppermost layer and the lowermost layer in the stacking direction T are bonded to the inner surface of the exterior body 10B by the adhesive layer 16.
  • the present invention is not limited to the above configuration.
  • the power storage device according to the present invention may have only one power storage unit.
  • the storage unit may be formed of a laminate of a plurality of pairs of first and second internal electrodes 11 and 12 sandwiching the electrolyte layer.
  • An exterior body 10B is provided outside the functional unit 10A.
  • the exterior body 10B has a function of suppressing the intrusion of water or the like into the functional unit 10A, and a function of suppressing the leakage of the electrolytic solution from the functional unit 10A.
  • the exterior body 10B can be made of, for example, an epoxy resin such as a naphthalene epoxy resin, a liquid crystal polymer, or the like.
  • the exterior body 10B is provided to cover the first and second main surfaces 10a2 and 10b2 and the first and second side surfaces 10c2 and 10d2 of the functional unit 10A.
  • the first and second end faces 10e2 and 10f2 of the functional unit 10A are exposed from the exterior body 10B.
  • a first external electrode 18 is provided on the device body 10. Specifically, the first outer electrode 18 is provided on the first end faces 10 e 1 and 10 e 2 and is electrically connected to the first inner electrode 11.
  • the first external electrode 18 has a first sprayed film 18a, a first conductive adhesive layer 18b, and a first metal cap 18c.
  • a first sprayed film 18a is provided on the first end faces 10e1 and 10e2. Substantially the entire first end faces 10e1 and 10e2 are covered with the first sprayed film 18a.
  • the first metal cap 18 c covers a portion on the first end face 10 e 1 side of the device body 10. Specifically, the first metal cap 18c has a first end face 10e1 and a first end face 10e1 of each of the first and second main faces 10a1 and 10b1 and the first and second side faces 10c1 and 10d1. Cover the side part.
  • a first conductive adhesive layer 18 b is provided between the first metal cap 18 c and the first sprayed film 18 a.
  • the first metal cap 18c and the first sprayed film 18a are electrically connected and bonded together by the first conductive adhesive layer 18b.
  • a second external electrode 19 is provided on the device body 10. Specifically, the second outer electrode 19 is provided on the second end face 10 f 1, 10 f 2 and is electrically connected to the first inner electrode 11. The exposed portion from the exterior body 10B of the functional portion 10A is covered by the second external electrode 19 and the first external electrode 18.
  • the second external electrode 19 has a second sprayed film 19a, a second conductive adhesive layer 19b, and a second metal cap 19c.
  • a second sprayed film 19a is provided on the second end faces 10f1 and 10f2. Substantially the entire second end faces 10f1 and 10f2 are covered with the second sprayed film 19a.
  • the second metal cap 19 c covers a portion on the second end face 10 f 1 side of the device body 10.
  • the second metal cap 19c has a second end face 10f1 and first and second main faces 10a1 and 10b1 and respective second end faces 10f1 of the first and second side faces 10c1 and 10d1. Cover the side part.
  • a second conductive adhesive layer 19b is provided between the second metal cap 19c and the second sprayed film 19a.
  • the second metal cap 19c and the second sprayed film 19a are electrically connected and bonded together by the second conductive adhesive layer 19b.
  • the first and second sprayed films 18a and 19a can be made of, for example, a metal foil made of at least one metal selected from the group consisting of Al, Cu, and Al-Si.
  • the first and second metal caps 18c and 19c are, for example, a base material containing an alloy (Fe-42Ni alloy), a base material made of aluminum or an aluminum alloy, a base material made of copper or a copper alloy, It can be constituted by Ni / Ag plating covering the outer surface of the material or Ni / Au plating.
  • a base material containing an alloy Fe-42Ni alloy
  • a base material made of aluminum or an aluminum alloy a base material made of copper or a copper alloy
  • It can be constituted by Ni / Ag plating covering the outer surface of the material or Ni / Au plating.
  • the contact area between the adhesion layer and the thermal spray film is small. Therefore, the adhesion between the device body and the sprayed film is low. Thus, the sprayed film is likely to be peeled off from the device body.
  • the sprayed film separates from the device body, the sprayed film separates from the internal electrode. Therefore, there is a possibility that the connection reliability between the external electrode and the internal electrode may be lowered.
  • the first adhesion layer 14 a having higher adhesion to the first sprayed film 18 a than the first insulating layer 15 a is provided. Therefore, the adhesion between the first sprayed film 18a and the device body 10 is enhanced. Furthermore, the first adhesive layer 14a is provided with a first recess 14a1 extending inward in the length direction L from the end face of the first adhesive layer 14a. The first sprayed film 18a is intruding into the first recess 14a1. For this reason, the bonding area between the first adhesion layer 14a and the first sprayed film 18a is large. Thus, the adhesion between the device body 10 and the first sprayed film 18a is further enhanced.
  • the first sprayed film 18 a is difficult to peel off from the device body 10. Therefore, the first sprayed film 18 a is less likely to be peeled off from the first inner electrode 11. Therefore, in the storage device 1, the connection reliability between the first outer electrode 18 and the first inner electrode 11 is high.
  • a second adhesion layer 14 b having higher adhesion to the second sprayed film 19 a than the first insulating layer 15 a is provided in the storage device 1. Therefore, the adhesion between the second sprayed film 19a and the device body 10 is enhanced. Further, the second adhesion layer 14b is provided with a second recess 14b1 extending inward in the length direction L from the end face of the second adhesion layer 14b. The second sprayed film 19a is intruding into the second recess 14b1. For this reason, the bonding area between the second adhesion layer 14b and the second sprayed film 19a is large. Thus, the adhesion between the device body 10 and the second sprayed film 19a is further enhanced.
  • the second sprayed film 19 a is less likely to be peeled off from the device body 10. Therefore, the second sprayed film 19 a is less likely to be peeled off from the second inner electrode 12. Therefore, in the storage device 1, the connection reliability between the second outer electrode 19 and the second inner electrode 12 is high.
  • the first adhesion layer 14a is provided on the first current collector 11a, and the first recess 14a1 is a first in the length direction L of the first current collector 11a.
  • the end face side end portion is provided to be exposed from the first adhesion layer 14a.
  • the bonding area between the first sprayed film 18 a and the first current collector 11 a is large.
  • the first sprayed film 18 a is less likely to be peeled off from the first inner electrode. Therefore, the connection reliability between the first outer electrode 18 and the first inner electrode 11 can be further enhanced.
  • the second adhesion layer 14b is provided on the second current collector 12a, and the second recess 14b1 is in the length direction L of the second current collector 12a.
  • the first end face side end portion is provided so as to be exposed from the second adhesion layer 14b.
  • the bonding area between the second sprayed film 19a and the second current collector 12a is large.
  • the second sprayed film 19 a is less likely to be peeled off from the second inner electrode 12. Therefore, the connection reliability between the second outer electrode 19 and the second inner electrode 12 can be further enhanced.
  • a third adhesion layer 14 c having a higher adhesion to the first sprayed film 18 a than the second insulating layer 15 b is further provided.
  • the third adhesive layer 14c is provided with a third recess 14c1 extending inward in the length direction from the end face of the third adhesive layer 14c.
  • the first sprayed film 18a is intruding into the third recess 14c1.
  • the bonding area between the third adhesion layer 14c and the first sprayed film 18a is large.
  • the adhesion between the device body 10 and the first sprayed film 18a is further enhanced. Therefore, the first sprayed film 18 a is more difficult to peel off from the device body 10. Therefore, the first sprayed film 18 a is more difficult to peel off from the first inner electrode 11. Therefore, in the storage device 1, the connection reliability between the first outer electrode 18 and the first inner electrode 11 is further high.
  • a fourth adhesion layer 14 d having a higher adhesion to the second sprayed film 19 a than the second insulating layer 15 b is further provided.
  • the fourth adhesive layer 14d is provided with a fourth recess 14d1 extending inward in the length direction from the end face of the fourth adhesive layer 14d.
  • the second sprayed film 19a is intruding into the fourth recess 14d1. Therefore, the bonding area between the fourth adhesion layer 14d and the second sprayed film 19a is large.
  • the adhesion between the device body 10 and the second sprayed film 19a is further enhanced. Therefore, the second sprayed film 19 a is more difficult to peel off from the device body 10. For this reason, the second sprayed film 19 a is further less likely to be peeled off from the second inner electrode 12. Therefore, in the storage device 1, the connection reliability between the second outer electrode 19 and the second inner electrode 12 is further high.
  • each of the first to fourth adhesion layers 14a, 14b, 14c and 14d is a porous layer Is preferred.
  • the surface area of each of the first to fourth adhesion layers 14a, 14b, 14c, and 14d is increased, and the area of the portion exhibiting the anchor effect is increased.
  • each of the first to fourth adhesion layers 14a, 14b, 14c and 14d is at least one selected from the group consisting of carbon particles, carbon compound particles, metal particles and metal oxide particles. It is preferred to include particles. In this case, the physical adsorption force or the chemical adsorption force between each of the first to fourth adhesion layers 14a, 14b, 14c, 14d and the first or second sprayed film 18a, 19a is increased.
  • each of the first and second current collectors 11a and 12a be formed of a metal foil.
  • Each of the first and second current collectors 11a and 12a is formed of a metal foil, thereby enhancing the bonding strength between the first and second current collectors 11a and 12a and the thermal spray films 18a and 19a. It is because you can.
  • the concave portions 14 a 1, 14 b 1, 14 c 1, 14 d 1 can be formed, for example, by physical etching such as plasma treatment or blast, or chemical etching using an etching agent.
  • the end faces thereof are subjected to etching treatment such as plasma treatment, and the first to fourth adhesion layers 14a, 14b,
  • the first to fourth recesses 14a1, 14b1, 14c1 and 14d1 can be configured by removing a part of 14c and 14d.

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Abstract

Provided is an electricity storage device which has high connection reliability between an internal electrode and an external electrode. According to the present invention, a device main body 10 comprises a first adhesion layer 14a and a second adhesion layer 14b. The first adhesion layer 14a exhibits higher adhesion to a first thermal spray film 18a than to an insulating layer 15. The second adhesion layer 14b exhibits higher adhesion to a second thermal spray film 19a than to the insulating layer 15. A surface of the first adhesion layer 14a exposed at a first end face 10f1 is provided with a first recess 14a1 that inwardly extends in the length direction L. A surface of the second adhesion layer 14b exposed at a second end face 10f1 is provided with a second recess 14b1 that inwardly extends in the length direction L. The first thermal spray film 18a has entered into the first recess 14a1. The second thermal spray film 19a has entered into the second recess 14b1.

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。例えば特許文献１には、蓄電デバイスの一例が記載されている。 Conventionally, various storage devices such as an electric double layer capacitor and a secondary battery are known. For example, Patent Document 1 describes an example of a storage device.
国際公開第２０１６／１２１４１６号International Publication No. 2016/121416
　蓄電デバイスの、内部電極と外部電極との接続信頼性を高めたいという要望がある。 There is a demand to improve the connection reliability between the internal electrode and the external electrode of the storage device.
　本発明の主な目的は、内部電極と外部電極との接続信頼性が高い蓄電デバイスを提供することにある。 The main object of the present invention is to provide an electricity storage device having high connection reliability between an internal electrode and an external electrode.
　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、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、電解質層と、絶縁層とを有する。第１の内部電極は、長さ方向及び幅方向に沿って延びている。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の集電体は、第１の端面に露出している。第１の活物質層は、第１の集電体の上に設けられている。第２の内部電極は、第１の内部電極に対して厚み方向に積層されている。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の集電体は、第２の端面に露出している。第２の活物質層は、第２の集電体の上に設けられている。電解質層は、第１の活物質層と第２の活物質層との間に配されている。絶縁層は、第１の集電体及び電解質層と第２の端面とを隔離している。絶縁層は、第２の集電体及び電解質層と第１の端面とを隔離している。絶縁層は、電解質層を包囲して設けられている。第１の外部電極は、第１の端面の上に設けられた第１の溶射膜を有している。第２の外部電極は、第２の端面の上に設けられた第２の溶射膜を有している。デバイス本体は、第１の密着層と、第２の密着層とをさらに有している。第１の密着層は、絶縁層よりも第１の溶射膜に対して高い密着性を有している。第１の密着層は、第１の端面に露出している。第２の密着層は、絶縁層よりも第２の溶射膜に対して高い密着性を有している。第２の密着層は、第２の端面に露出している。第１の密着層の第１の端面に露出している面に、長さ方向において内側に延びる第１の凹部が設けられている。第２の密着層の第２の端面に露出している面に、長さ方向において内側に延びる第２の凹部が設けられている。第１の溶射膜が第１の凹部内に入り込んでいる。第２の溶射膜が第２の凹部内に入り込んでいる。 An 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 major surfaces, first and second side surfaces, and first and second end surfaces. The first and second major surfaces extend in the longitudinal direction and the width direction. The first and second side surfaces extend in the longitudinal direction and the thickness direction. The first and second end surfaces extend in 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 has a first internal electrode, a second internal electrode, an electrolyte layer, and an insulating layer. The first inner electrode extends along the length direction and the width direction. The first inner electrode has a first current collector and a first active material layer. The first current collector is exposed at the first end face. The first active material layer is provided on the first current collector. The second inner electrode is stacked in the thickness direction with respect to the first inner electrode. The second inner electrode has a second current collector and a second active material layer. The second current collector is exposed at the second end face. The second active material layer is provided on the second current collector. The electrolyte layer is disposed between the first active material layer and the second active material layer. The insulating layer separates the first current collector and the electrolyte layer from the second end face. The insulating layer separates the second current collector and the electrolyte layer from the first end face. The insulating layer is provided to surround the electrolyte layer. The first external electrode has a first sprayed film provided on the first end face. The second external electrode has a second sprayed film provided on the second end face. The device body further includes a first adhesion layer and a second adhesion layer. The first adhesion layer has higher adhesion to the first sprayed film than the insulating layer. The first adhesion layer is exposed at the first end face. The second adhesion layer has higher adhesion to the second sprayed film than the insulating layer. The second adhesion layer is exposed at the second end face. A first recess extending inward in the longitudinal direction is provided on the surface exposed to the first end face of the first adhesive layer. A second recess extending inward in the longitudinal direction is provided on the surface exposed to the second end face of the second adhesive layer. The first sprayed film is in the first recess. The second sprayed film is in the second recess.
　本発明に係る蓄電デバイスでは、絶縁層よりも第１の溶射膜に対する密着性が高い第１の密着層が設けられている。このため、第１の密着層が設けられていない場合よりも、第１の溶射膜とデバイス本体との密着強度が高い。さらに、第１の密着層には、第１の密着層の端面から長さ方向において内側に延びる第１の凹部が設けられている。この第１の凹部に、第１の溶射膜が入り込んでいる。このため、第１の密着層と第１の溶射膜との接合面積が大きい。よって、デバイス本体と第１の溶射膜との密着性がより高められている。従って、第１の溶射膜がデバイス本体から剥離し難い。このため、第１の溶射膜が第１の内部電極から剥離し難い。よって、本発明に係る蓄電デバイスでは、第１の外部電極と第１の内部電極との接続信頼性が高い。 In the electricity storage device according to the present invention, the first adhesion layer having higher adhesion to the first sprayed film than the insulating layer is provided. Therefore, the adhesion strength between the first sprayed film and the device body is higher than in the case where the first adhesion layer is not provided. Furthermore, the first adhesive layer is provided with a first recess extending inward in the longitudinal direction from the end face of the first adhesive layer. The first sprayed film is intruding into the first recess. Therefore, the bonding area between the first adhesion layer and the first sprayed film is large. Thus, the adhesion between the device body and the first sprayed film is further enhanced. Therefore, the first sprayed film is less likely to peel off from the device body. For this reason, it is difficult for the first sprayed film to be peeled off from the first internal electrode. Therefore, in the electricity storage device according to the present invention, the connection reliability between the first outer electrode and the first inner electrode is high.
　同様に、本発明に係る蓄電デバイスでは、絶縁層よりも第２の溶射膜に対する密着性が高い第２の密着層が設けられている。このため、第２の密着層が設けられていない場合よりも、第２の溶射膜とデバイス本体との密着強度が高い。さらに、第２の密着層には、第２の密着層の端面から長さ方向において内側に延びる第２の凹部が設けられている。この第２の凹部に、第２の溶射膜が入り込んでいる。このため、第２の密着層と第２の溶射膜との接合面積が大きい。よって、デバイス本体と第２の溶射膜との密着性がより高められている。従って、第２の溶射膜がデバイス本体から剥離し難い。このため、第２の溶射膜が第２の内部電極から剥離し難い。よって、本発明に係る蓄電デバイスでは、第２の外部電極と第２の内部電極との接続信頼性が高い。 Similarly, in the electricity storage device according to the present invention, a second adhesion layer having higher adhesion to the second sprayed film than the insulating layer is provided. For this reason, the adhesion strength between the second sprayed film and the device body is higher than when the second adhesion layer is not provided. Furthermore, the second adhesive layer is provided with a second recess extending inward in the length direction from the end face of the second adhesive layer. The second sprayed film is intruding into the second recess. Therefore, the bonding area between the second adhesion layer and the second sprayed film is large. Thus, the adhesion between the device body and the second sprayed film is further enhanced. Therefore, the second sprayed film is less likely to be peeled off from the device body. Therefore, the second sprayed film is less likely to be peeled off from the second internal electrode. Therefore, in the electricity storage device according to the present invention, the connection reliability between the second outer electrode and the second inner electrode is high.
　以上より、本発明に係る蓄電デバイスでは、外部電極と内部電極との接続信頼性が高い。 As mentioned above, in the electrical storage device which concerns on this invention, the connection reliability of an external electrode and an internal electrode is high.
　本発明に係る蓄電デバイスでは、第１の密着層が第１の集電体の上に設けられており、第１の凹部は、第１の集電体の長さ方向における第１の端面側端部が第１の密着層から露出するように設けられており、第２の密着層が第２の集電体の上に設けられており、第２の凹部は、第２の集電体の長さ方向における第２の端面側端部が第２の密着層から露出す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 adhesion layer is provided on the first current collector, and the first recess is a first end face side in the length direction of the first current collector. The end portion is provided so as to be exposed from the first adhesion layer, the second adhesion layer is provided on the second current collector, and the second recess is provided for the second current collector. It is preferable that a second end face side end in the longitudinal direction be provided so as to be exposed from the second adhesion layer.
　本発明に係る蓄電デバイスでは、厚み方向において、第１の密着層が第１の活物質層と同位置に位置している部分を含み、かつ、第１の密着層と第１の活物質層とが同じ材料により構成されており、厚み方向において、第２の密着層が第２の活物質層と同位置に位置している部分を含み、かつ、第２の密着層と第２の活物質層とが同じ材料により構成されていることが好ましい。 In the electricity storage device according to the present invention, the first adhesion layer includes the portion located at the same position as the first active material layer in the thickness direction, and the first adhesion layer and the first active material layer Are made of the same material, and the second adhesion layer includes a portion located at the same position as the second active material layer in the thickness direction, and the second adhesion layer and the second active layer It is preferable that the material layer and the material layer be made of the same material.
　本発明に係る蓄電デバイスでは、デバイス本体が、絶縁層よりも第１の溶射膜に対して高い密着性を有し、第１の端面に露出した第３の密着層と、絶縁層よりも第２の溶射膜に対して高い密着性を有し、第２の端面に露出した第４の密着層とをさらに有していてもよい。この場合、第３の密着層の第１の端面に露出している面に、長さ方向において内側に延びる第３の凹部が設けられており、第４の密着層の第２の端面に露出している面に、長さ方向において内側に延びる第４の凹部が設けられており、第３の溶射膜が第３の凹部内に入り込んでおり、第４の溶射膜が第４の凹部内に入り込んでおり、厚み方向において、第３の密着層が第２の活物質層と同位置に位置している部分を含み、かつ、第３の密着層と第２の活物質層とが同じ材料により構成されており、厚み方向において、第４の密着層が第１の活物質層と同位置に位置している部分を含み、かつ、第４の密着層と第１の活物質層とが同じ材料により構成されていることが好ましい。 In the electricity storage device according to the present invention, the device body has higher adhesion to the first sprayed film than the insulating layer, and the third adhesive layer exposed at the first end face and the third adhesion layer It may have high adhesion to the thermal spray coating of No. 2 and further have a fourth adhesion layer exposed at the second end face. In this case, a third recess extending inward in the longitudinal direction is provided on the surface exposed to the first end face of the third adhesive layer, and exposed to the second end surface of the fourth adhesive layer. The fourth concave portion extending inward in the length direction is provided in the surface where the third thermal spray coating is in the third concave, and the fourth thermal spray coating is in the fourth concave. And the third adhesion layer includes a portion located at the same position as the second active material layer in the thickness direction, and the third adhesion layer and the second active material layer are the same. It is made of a material, and the fourth adhesion layer includes a portion located at the same position as the first active material layer in the thickness direction, and the fourth adhesion layer and the first active material layer Are preferably made of the same material.
　本発明に係る蓄電デバイスでは、密着層のそれぞれが、多孔質層であることが好ましい。 In the electricity storage device according to the present invention, each of the adhesion layers is preferably a porous layer.
　本発明に係る蓄電デバイスでは、密着層のそれぞれが、カーボン粒子、炭素化合物粒子、金属粒子及び金属酸化物粒子のうちからなる群から選ばれた少なくとも一種の粒子を含むことが好ましい。 In the electricity storage device according to the present invention, each of the adhesion layers preferably contains at least one particle selected from the group consisting of carbon particles, carbon compound particles, metal particles and metal oxide particles.
　本発明に係る蓄電デバイスでは、第１及び第２の集電体のそれぞれが、金属箔により構成されていることが好ましい。 In the electricity storage device according to the present invention, each of the first and second current collectors is preferably made of a metal foil.
　本発明に係る蓄電デバイスでは、絶縁層が第１及び第２の端面に露出していることが好ましい。 In the electricity storage device according to the present invention, the insulating layer is preferably exposed to the first and second end faces.
　本発明によれば、内部電極と外部電極との接続信頼性が高い蓄電デバイスを提供することができる。 According to the present invention, it is possible to provide an electricity storage device having high connection reliability between the internal electrode and the external electrode.
図１は、本発明の一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 a power storage device according to an embodiment of the present invention. 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、図２の線ＩＩＩ－ＩＩＩにおける模式的断面図である。FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 図４は、図３の線ＩＶ－ＩＶにおける模式的断面図である。FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG.
　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 the preferable form which implemented this invention is demonstrated. However, the following embodiments are merely illustrative. The present invention is not at all 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。 Moreover, in each drawing referred in the embodiment etc., members having substantially the same functions are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. The ratio of dimensions of objects drawn in the drawing may differ from the ratio of dimensions of real objects. The dimensional ratio of the object may differ between the drawings. Specific dimensional ratios and the like of objects should be determined in consideration of the following description.
　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、図２の線ＩＩＩ－ＩＩＩにおける模式的断面図である。 FIG. 1 is a schematic perspective view of a power storage device according to the present embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
　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, a device that constitutes an electric double layer capacitor or 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、直方体状に設けられている。 The storage device 1 includes a device body 10. The device body 10 is provided in a rectangular shape.
　デバイス本体１０は、第１及び第２の主面１０ａ１、１０ｂ１と、第１及び第２の側面１０ｃ１、１０ｄ１（図３を参照。）と、第１及び第２の端面１０ｅ１、１０ｆ１（図２を参照。）とを有する。第１及び第２の主面１０ａ１、１０ｂ１は、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１０ａ１と第２の主面１０ｂ１とは、厚み方向Ｔにおいて対向している。図３に示すように、第１及び第２の側面１０ｃ１、１０ｄ１は、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１０ｃ１と第２の側面１０ｄ１とは、幅方向Ｗにおいて対向している。図２に示すように、第１及び第２の端面１０ｅ１、１０ｆ１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１０ｅ１と第２の端面１０ｆ１とは、長さ方向Ｌにおいて対向している。 The device body 10 has first and second main surfaces 10a1 and 10b1, first and second side surfaces 10c1 and 10d1 (see FIG. 3), and first and second end surfaces 10e1 and 10f1 (FIG. 2). See)). The first and second major surfaces 10a1 and 10b1 extend along the length direction L and the width direction W. The first major surface 10a1 and the second major surface 10b1 are opposed in the thickness direction T. As shown in FIG. 3, the first and second side surfaces 10 c 1 and 10 d 1 extend along the length direction L and the thickness direction T. The first side surface 10c1 and the second side surface 10d1 face each other in the width direction W. As shown in FIG. 2, the first and second end faces 10 e 1 and 10 f 1 extend in the width direction W and the thickness direction T. The first end face 10e1 and the second end face 10f1 are opposed in the length direction L.
　図２及び図３に示すように、デバイス本体１０は、機能部１０Ａと、外装体１０Ｂとを有する。 As shown in FIGS. 2 and 3, the device body 10 includes a functional unit 10A and an exterior body 10B.
　機能部１０Ａは、少なくとも一部が蓄電デバイスとしての機能を発現する部分である。 The functional unit 10A is a portion at least a part of which exhibits a function as a power storage device.
　機能部１０Ａは、直方体状に設けられている。機能部１０Ａは、第１及び第２の主面１０ａ２、１０ｂ２と、第１及び第２の側面１０ｃ２、１０ｄ２（図３を参照。）と、第１及び第２の端面１０ｅ２、１０ｆ２（図２を参照。）とを有する。第１及び第２の主面１０ａ２、１０ｂ２は、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１０ａ２と第２の主面１０ｂ２とは、厚み方向Ｔにおいて対向している。図３に示すように、第１及び第２の側面１０ｃ２、１０ｄ２は、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１０ｃ２と第２の側面１０ｄ２とは、幅方向Ｗにおいて対向している。図２に示すように、第１及び第２の端面１０ｅ２、１０ｆ２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１０ｅ２と第２の端面１０ｆ２とは、長さ方向Ｌにおいて対向している。 The functional unit 10A is provided in a rectangular shape. The functional unit 10A has first and second main surfaces 10a2 and 10b2, first and second side surfaces 10c2 and 10d2 (see FIG. 3), and first and second end surfaces 10e2 and 10f2 (FIG. 2). See)). The first and second major surfaces 10a2 and 10b2 extend along the length direction L and the width direction W. The first major surface 10a2 and the second major surface 10b2 face each other in the thickness direction T. As shown in FIG. 3, the first and second side surfaces 10 c 2 and 10 d 2 extend along the length direction L and the thickness direction T. The first side surface 10c2 and the second side surface 10d2 face each other in the width direction W. As shown in FIG. 2, the first and second end faces 10 e 2 and 10 f 2 extend in the width direction W and the thickness direction T. The first end face 10e2 and the second end face 10f2 face each other in the length direction L.
　本実施形態では、機能部１０Ａの第１の端面１０ｅ２が、デバイス本体１０の第１の端面１０ｅ１の一部、具体的には、外装体１０Ｂにより構成された部分を除いた部分を構成している。機能部１０Ａの第２の端面１０ｆ２が、デバイス本体１０の第２の端面１０ｆ１の一部、具体的には、外装体１０Ｂにより構成された部分を除いた部分を構成している。 In the present embodiment, the first end face 10e2 of the functional unit 10A constitutes a part excluding the part of the first end face 10e1 of the device body 10, specifically, the part formed of the exterior body 10B. There is. The second end face 10f2 of the functional unit 10A constitutes a part of the second end face 10f1 of the device body 10, specifically, a part excluding the part formed by the exterior body 10B.
　なお、本発明において、「直方体状」には、角部や稜線部が、面取り状や丸められた形状を有する直方体状が含まれるものとする。 In the present invention, the “cuboid shape” includes a rectangular shape having a chamfered shape or a rounded shape at a corner portion or a ridge portion.
　機能部１０Ａは、第１の内部電極１１と、第２の内部電極１２と、電解質層１３とを有する。 The functional unit 10 </ b> A includes a first inner electrode 11, a second inner electrode 12, and an electrolyte layer 13.
　第１の内部電極１１は、長さ方向Ｌ及び幅方向Ｗに沿って延びている。第１の内部電極１１は、機能部１０Ａの第１及び第２の主面１０ａ２、１０ｂ２と平行に設けられている。 The first inner electrode 11 extends along the length direction L and the width direction W. The first inner electrode 11 is provided in parallel to the first and second main surfaces 10a2 and 10b2 of the functional unit 10A.
　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とを有する。 The first inner electrode 11 has a first current collector 11a and a first active material layer 11b.
　第１の集電体１１ａは、第１の端面１０ｅ１、１０ｅ２に引き出されている。第１の集電体１１ａは、第１の端面１０ｅ１、１０ｅ２に露出している。第１の集電体１１ａは、第１及び第２の側面１０ｃ２、１０ｄ２並びに第２の端面１０ｆ１、１０ｆ２には引き出されていない。 The first current collector 11a is drawn out to the first end faces 10e1 and 10e2. The first current collector 11a is exposed at the first end faces 10e1 and 10e2. The first current collector 11a is not drawn out to the first and second side faces 10c2 and 10d2 and the second end faces 10f1 and 10f2.
　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等により構成することができる。 The first current collector 11a can be made of, for example, a metal foil made of at least one metal such as aluminum and copper.
　なお、本発明において、「金属」には、合金が含まれるものとする。 In the present invention, "metal" includes alloys.
　第１の集電体１１ａの一方側の表面の上には、第１の活物質層１１ｂが設けられている。第１の活物質層１１ｂは、活物質を含む。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、第１の活物質層１１ｂは、分極性電極を構成している。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は、分極性電極としての第１の活物質層１１ｂは、例えば、活性炭などの炭素材料を活物質として含んでいることが好ましい。 A first active material layer 11 b is provided on the surface on one side of the first current collector 11 a. The first active material layer 11 b contains an active material. When the storage device 1 constitutes an electric double layer capacitor, the first active material layer 11 b constitutes a polarizable electrode. When the storage device 1 constitutes an electric double layer capacitor, it is preferable that the first active material layer 11b as the polarizable electrode contains, for example, a carbon material such as activated carbon as an active material.
　第２の内部電極１２は、長さ方向Ｌ及び幅方向Ｗに沿って延びている。第２の内部電極１２は、機能部１０Ａの第１及び第２の主面１０ａ２、１０ｂ２と平行に設けられている。 The second inner electrode 12 extends along the length direction L and the width direction W. The second inner electrode 12 is provided in parallel to the first and second main surfaces 10a2 and 10b2 of the functional unit 10A.
　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とを有する。 The second inner electrode 12 includes a second current collector 12a and a second active material layer 12b.
　第２の集電体１２ａは、第２の端面１０ｆ１、１０ｆ２に引き出されており、第２の端面１０ｆ１、１０ｆ２に露出している。第２の集電体１２ａは、第１及び第２の側面１０ｃ２、１０ｄ２並びに第１の端面１０ｅ１、１０ｅ２には引き出されていない。 The second current collector 12a is drawn to the second end faces 10f1 and 10f2, and exposed to the second end faces 10f1 and 10f2. The second current collector 12a is not drawn out to the first and second side faces 10c2 and 10d2 and the first end face 10e1 and 10e2.
　第２の内部電極１２は、第１の内部電極１１に対して厚み方向Ｔに積層されている。第２の内部電極１２の第２の集電体１２ａのうち、第２の端面１０ｆ１、１０ｆ２側端部を除いた部分は、第１の内部電極１１の第１の集電体１１ａのうち、第１の端面１０ｅ１、１０ｅ２側端部を除いた部分と厚み方向Ｔにおいて対向している。 The second inner electrode 12 is stacked in the thickness direction T with respect to the first inner electrode 11. Of the second current collector 12 a of the second inner electrode 12, the portion excluding the second end face 10 f 1, 10 f 2 side end portion is the portion of the first current collector 11 a of the first inner electrode 11, It faces in the thickness direction T a portion excluding the first end face 10e1 and 10e2 side end.
　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, for example, a metal foil made of at least one metal such as aluminum and copper.
　第２の活物質層１２ｂは、第２の集電体１２ａの第１の内部電極１１側表面上に設けられている。従って、第２の活物質層１２ｂは、第１の活物質層１１ｂと厚み方向Ｔにおいて対向している。 The second active material layer 12 b is provided on the surface of the second current collector 12 a on the first inner electrode 11 side. Therefore, the second active material layer 12 b is opposed to the first active material layer 11 b in the thickness direction T.
　第２の活物質層１２ｂは、活物質を含む。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、第２の活物質層１２ｂは、分極性電極を構成している。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は、分極性電極としての第２の活物質層１２ｂは、例えば、活性炭などの炭素材料を活物質として含んでいることが好ましい。 The second active material layer 12 b contains an active material. When the storage device 1 constitutes an electric double layer capacitor, the second active material layer 12 b constitutes a polarizable electrode. When the storage device 1 constitutes an electric double layer capacitor, it is preferable that the second active material layer 12 b as the polarizable electrode contains, for example, a carbon material such as activated carbon as an active material.
　第１の内部電極１１の第１の活物質層１１ｂと、第２の内部電極１２の第２の活物質層１２ｂとの間には、電解質層１３が設けられている。電解質層１３は、電解質を含む層である。電解質層１３は、ゲル状の電解質であるゲル電解質により構成されていてもよいし、電解液が含浸したセパレータ等の多孔質体により構成されていてもよい。ゲル電解質の具体例としては、例えば、電解質を含む高分子ポリエチレンオキサイド等が挙げられる。 An electrolyte layer 13 is provided between the first active material layer 11 b of the first inner electrode 11 and the second active material layer 12 b of the second inner electrode 12. The electrolyte layer 13 is a layer containing an electrolyte. The electrolyte layer 13 may be constituted by a gel electrolyte which is a gel electrolyte, or may be constituted by a porous body such as a separator impregnated with an electrolytic solution. As a specific example of a gel electrolyte, high molecular polyethylene oxide containing an electrolyte etc. are mentioned, for example.
　電解質の具体例としては、例えば、ＥＭＩＴＦＳＩ（１－エチル－３－メチルイミダゾリウムビス（トリフルオロメタンスルホニル）イミド）、ＥＭＩＢＦ４（ホウフッ化１－エチル－３－メチルイミダゾリウム）等のイオン性液体、または、そのイオン性液体をプロピレンカーボネート、アセトニトリル等の有機溶媒に溶解させたものが挙げられる。これらの電解質のうちの１種のみを用いてもよいし、複数種類を混合して用いてもよい。 Specific examples of the electrolyte include, for example, ionic liquids such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or And those obtained by dissolving the ionic liquid in an organic solvent such as propylene carbonate and acetonitrile. Only one of these electrolytes may be used, or a plurality of types may be mixed and used.
　具体的には、本実施形態では、電解質層１３は、第１の電解質層１３ａと、第２の電解質層１３ｂとを有する。第１の電解質層１３ａは、第１の活物質層１１ｂの上に設けられている。一方、第２の電解質層１３ｂは、第２の活物質層１２ｂの上に設けられている。第１の電解質層１３ａと第２の電解質層１３ｂとは、電解質が相互に移動可能なように接触している。第１の電解質層１３ａと第２の電解質層１３ｂは、密着していることが好ましい。 Specifically, in the present embodiment, the electrolyte layer 13 has a first electrolyte layer 13a and a second electrolyte layer 13b. The first electrolyte layer 13a is provided on the first active material layer 11b. On the other hand, the second electrolyte layer 13 b is provided on the second active material layer 12 b. The first electrolyte layer 13a and the second electrolyte layer 13b are in contact with each other so that the electrolytes can move relative to each other. It is preferable that the first electrolyte layer 13a and the second electrolyte layer 13b be in close contact with each other.
　本実施形態では、上述したように、第１の内部電極１１のうち、第１の集電体１１ａのみが第１の端面１０ｅ２に露出している（図２を参照。）。第２の内部電極１２のうち、第２の集電体１２ａのみが第２の端面１０ｆ２に露出している。第１の内部電極１１の第１の活物質層１１ｂ、第２の内部電極１２の第２の活物質層１２ｂ及び電解質層１３は、第１及び第２の端面１０ｅ２、１０ｆ２に露出していない。 In the present embodiment, as described above, only the first current collector 11a of the first inner electrode 11 is exposed to the first end face 10e2 (see FIG. 2). Of the second internal electrode 12, only the second current collector 12 a is exposed to the second end face 10 f 2. The first active material layer 11b of the first inner electrode 11, the second active material layer 12b of the second inner electrode 12, and the electrolyte layer 13 are not exposed to the first and second end faces 10e2 and 10f2. .
　第１及び第２の活物質層１１ｂ、１２ｂ並びに電解質層１３と第１の端面１０ｅ１、１０ｅ２の間には、絶縁層１５が設けられている。具体的には、図４に示すように、絶縁層１５は、第１の集電体１１ａ及び電解質層１３と、第２の端面１０ｆ１、１０ｆ２とを隔離すると共に、第２の集電体１２ａ及び電解質層１３と、第１の端面１０ｅ１、１０ｅ２とを隔離するように、電解質層１３を包囲して設けられている。 An insulating layer 15 is provided between the first and second active material layers 11 b and 12 b and the electrolyte layer 13 and the first end faces 10 e 1 and 10 e 2. Specifically, as shown in FIG. 4, the insulating layer 15 separates the first current collector 11a and the electrolyte layer 13 from the second end faces 10f1 and 10f2, and the second current collector 12a. And the electrolyte layer 13 is provided so as to separate the electrolyte layer 13 from the first end faces 10e1 and 10e2.
　具体的には、図３に示すように、絶縁層１５は、第１の絶縁層１５ａと、第２の絶縁層１５ｂとを有する。第１の絶縁層１５ａにより、第１の活物質層１１ｂ及び第１の電解質層１３ａとが第１の端面１０ｅ１、１０ｅ２から隔離されている。第２の絶縁層１５ｂにより、第２の活物質層１２ｂ及び第２の電解質層１３ｂと第２の端面１０ｆ１、１０ｆ２とが隔離されている。 Specifically, as shown in FIG. 3, the insulating layer 15 has a first insulating layer 15 a and a second insulating layer 15 b. The first active material layer 11 b and the first electrolyte layer 13 a are separated from the first end faces 10 e 1 and 10 e 2 by the first insulating layer 15 a. The second active material layer 12 b and the second electrolyte layer 13 b are separated from the second end faces 10 f 1 and 10 f 2 by the second insulating layer 15 b.
　より具体的には、第１の絶縁層１５ａにより、第１の活物質層１１ｂ及び第１の電解質層１３ａと第１及び第２の側面１０ｄのそれぞれとが隔離されている。すなわち、第１の絶縁層１５ａは、第１の活物質層１１ｂ及び第１の電解質層１３ａの第１及び第２の端面１０ｅ１、１０ｅ２、１０ｆ１、１０ｆ２側並びに第１及び第２の側面１０ｃ、１０ｄ側を覆うように設けられている。一方、第２の絶縁層１５ｂは、第２の活物質層１１ｂ及び第２の電解質層１３ｂと第１及び第２の側面１０ｃ、１０ｄのそれぞれとを隔離している。すなわち、第２の絶縁層１５ｂは、第２の活物質層１１ｂ及び第２の電解質層１３ｂの第１及び第２の端面１０ｅ、１０ｆ側並びに第１及び第２の側面１０ｃ、１０ｄ側を覆うように設けられている。 More specifically, the first active material layer 11b and the first electrolyte layer 13a are separated from the first and second side surfaces 10d by the first insulating layer 15a. That is, the first insulating layer 15a includes the first and second end faces 10e1, 10e2, 10f1, and 10f2 of the first active material layer 11b and the first electrolyte layer 13a, and the first and second side surfaces 10c, It is provided to cover the 10d side. On the other hand, the second insulating layer 15b isolates the second active material layer 11b and the second electrolyte layer 13b from the first and second side surfaces 10c and 10d. That is, the second insulating layer 15b covers the first and second end faces 10e and 10f of the second active material layer 11b and the second electrolyte layer 13b and the first and second side surfaces 10c and 10d. It is provided as.
　なお、絶縁層１５は、例えば、ウレタン樹脂、アクリル樹脂、エポキシ樹脂、ポリイミド樹脂、シリコーン樹脂等により構成することができる。 The insulating layer 15 can be made of, for example, a urethane resin, an acrylic resin, an epoxy resin, a polyimide resin, a silicone resin, or the like.
　図２に示すように、蓄電デバイス１は、第１及び第２の密着層１４ａ、１４ｂを有する。蓄電デバイス１は、第３及び第４の密着層１４ｃ、１４ｄをさらに有する。もっとも、本発明において、蓄電デバイスは、第１及び第２の密着層のみを備えており、第３及び第４の密着層を備えていなくてもよい。 As shown in FIG. 2, the power storage device 1 has first and second adhesion layers 14 a and 14 b. The storage device 1 further includes third and fourth adhesion layers 14c and 14d. However, in the present invention, the electricity storage device may include only the first and second adhesion layers, and may not include the third and fourth adhesion layers.
　第１の密着層１４ａは、第１の集電体１１ａの上に設けられている。具体的には、第１の密着層１４ａは、第１の絶縁層１５ａの長さ方向Ｌにおける外側に設けられている。第１の密着層１４ａは、積層方向Ｔにおいて第１の活物質層１１ｂと同位置に設けられている部分を有する。第１の密着層１４ａは、第１の端面１０ｅ１、１０ｅ２に露出している。 The first adhesion layer 14a is provided on the first current collector 11a. Specifically, the first adhesion layer 14a is provided on the outer side in the length direction L of the first insulating layer 15a. The first adhesion layer 14 a has a portion provided at the same position as the first active material layer 11 b in the stacking direction T. The first adhesion layer 14a is exposed at the first end faces 10e1 and 10e2.
　第２の密着層１４ｂは、第２の集電体１２ａの上に設けられている。具体的には、第２の密着層１４ｂは、第１の絶縁層１５ａの長さ方向Ｌにおける外側に設けられている。第２の密着層１４ｂは、積層方向Ｔにおいて第２の活物質層１２ｂと同位置に設けられている部分を有する。第２の密着層１４ｂは、第２の端面１０ｆ１、１０ｆ２に露出している。 The second adhesion layer 14 b is provided on the second current collector 12 a. Specifically, the second adhesion layer 14 b is provided outside in the length direction L of the first insulating layer 15 a. The second adhesion layer 14 b has a portion provided at the same position as the second active material layer 12 b in the stacking direction T. The second adhesion layer 14 b is exposed at the second end faces 10 f 1 and 10 f 2.
　第３の密着層１４ｃは、第２の絶縁層１５ｂの長さ方向Ｌにおける外側に設けられている。第３の密着層１４ｃは、積層方向Ｔにおいて第２の活物質層１２ｂと同位置に設けられている部分を有する。第３の密着層１４ｃは、第１の端面１０ｅ１、１０ｅ２に露出している。 The third adhesion layer 14c is provided on the outer side in the length direction L of the second insulating layer 15b. The third adhesion layer 14 c has a portion provided in the same position as the second active material layer 12 b in the stacking direction T. The third adhesion layer 14c is exposed at the first end faces 10e1 and 10e2.
　第４の密着層１４ｄは、第２の絶縁層１５ｂの長さ方向Ｌにおける外側に設けられている。第４の密着層１４ｄは、積層方向Ｔにおいて第２の活物質層１２ｂと同位置に設けられている部分を有する。第４の密着層１４ｄは、第２の端面１０ｆ１、１０ｆ２に露出している。 The fourth adhesive layer 14d is provided on the outer side in the length direction L of the second insulating layer 15b. The fourth adhesive layer 14 d has a portion provided at the same position as the second active material layer 12 b in the stacking direction T. The fourth adhesion layer 14d is exposed at the second end faces 10f1 and 10f2.
　第１及び第３の密着層１４ａ、１４ｃは、例えば、第１の活物質層１１ｂと同材料により構成することができる。 The first and third adhesion layers 14a and 14c can be made of, for example, the same material as the first active material layer 11b.
　例えば、第１及び第３の密着層１４ａ、１４ｃを第１の活物質層１１ｂと同材料により構成する場合、第１及び第３の密着層１４ａ、１４ｃと、第１の活物質層１１ｂとを同一工程で構成し得る。 For example, when the first and third adhesion layers 14a and 14c are made of the same material as the first active material layer 11b, the first and third adhesion layers 14a and 14c, and the first active material layer 11b and Can be configured in the same step.
　第２及び第４の密着層１４ｂ、１４ｄは、例えば、第２の活物質層１２ｂと同材料により構成することができる。 The second and fourth adhesion layers 14b and 14d can be made of, for example, the same material as the second active material layer 12b.
　例えば、第２及び第４の密着層１４ｂ、１４ｄを第２の活物質層１２ｂと同材料により構成する場合、第２及び第４の密着層１４ｂ、１４ｄと、第２の活物質層１２ｂとを同一工程で形成し得る。 For example, when the second and fourth adhesion layers 14b and 14d are made of the same material as the second active material layer 12b, the second and fourth adhesion layers 14b and 14d, and the second active material layer 12b and Can be formed in the same step.
　本実施形態の蓄電デバイス１では、一対の第１及び第２の内部電極１１，１２、電解質層１３、絶縁層１５並びに第１～第４の密着層１４ａ～１４ｄがひとつの蓄電ユニット１７を構成している。蓄電デバイス１では、蓄電ユニット１７が複数積層されており、この複数の蓄電ユニット１７の積層体が機能部１０Ａを構成している。なお、積層方向Ｔにおいて隣り合う蓄電ユニット１７は、接着層１６により接着されている。また、積層方向Ｔにおける最上層及び最下層のそれぞれに位置する蓄電ユニット１７は、外装体１０Ｂの内面に対して、接着層１６により接着されている。 In the electricity storage device 1 of the present embodiment, the pair of first and second internal electrodes 11 and 12, the electrolyte layer 13, the insulating layer 15, and the first to fourth adhesion layers 14a to 14d constitute one electricity storage unit 17. doing. In the storage device 1, a plurality of storage units 17 are stacked, and the stack of the plurality of storage units 17 constitutes the functional unit 10A. The storage units 17 adjacent in the stacking direction T are bonded by the adhesive layer 16. Further, the storage units 17 located in the uppermost layer and the lowermost layer in the stacking direction T are bonded to the inner surface of the exterior body 10B by the adhesive layer 16.
　もっとも、本発明は、上記構成に限定されない。例えば、本発明に係る蓄電デバイスは、蓄電ユニットをひとつのみ有していてもよい。蓄電ユニットは、電解質層を挟持する複数対の第１及び第２の内部電極１１、１２の積層体により構成されていてもよい。 However, the present invention is not limited to the above configuration. For example, the power storage device according to the present invention may have only one power storage unit. The storage unit may be formed of a laminate of a plurality of pairs of first and second internal electrodes 11 and 12 sandwiching the electrolyte layer.
　機能部１０Ａの外側には、外装体１０Ｂが設けられている。この外装体１０Ｂは、機能部１０Ａへの水分等の侵入を抑制する機能や、機能部１０Ａからの電解液の漏洩を抑制する機能を有している。外装体１０Ｂは、例えば、ナフタレン系エポキシ樹脂等のエポキシ樹脂や液晶ポリマーなどにより構成することができる。 An exterior body 10B is provided outside the functional unit 10A. The exterior body 10B has a function of suppressing the intrusion of water or the like into the functional unit 10A, and a function of suppressing the leakage of the electrolytic solution from the functional unit 10A. The exterior body 10B can be made of, for example, an epoxy resin such as a naphthalene epoxy resin, a liquid crystal polymer, or the like.
　外装体１０Ｂは、機能部１０Ａの第１及び第２の主面１０ａ２、１０ｂ２並びに第１及び第２の側面１０ｃ２、１０ｄ２を覆うように設けられている。機能部１０Ａの第１及び第２の端面１０ｅ２、１０ｆ２は、外装体１０Ｂから露出している。 The exterior body 10B is provided to cover the first and second main surfaces 10a2 and 10b2 and the first and second side surfaces 10c2 and 10d2 of the functional unit 10A. The first and second end faces 10e2 and 10f2 of the functional unit 10A are exposed from the exterior body 10B.
　図２に示すように、デバイス本体１０の上には、第１の外部電極１８が設けられている。具体的には、第１の外部電極１８は、第１の端面１０ｅ１、１０ｅ２の上に設けられており、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の溶射膜１８ａと、第１の導電性接着層１８ｂと、第１の金属キャップ１８ｃとを有する。 As shown in FIG. 2, a first external electrode 18 is provided on the device body 10. Specifically, the first outer electrode 18 is provided on the first end faces 10 e 1 and 10 e 2 and is electrically connected to the first inner electrode 11. The first external electrode 18 has a first sprayed film 18a, a first conductive adhesive layer 18b, and a first metal cap 18c.
　第１の端面１０ｅ１、１０ｅ２の上には、第１の溶射膜１８ａが設けられている。この第１の溶射膜１８ａにより、第１の端面１０ｅ１、１０ｅ２の実質的に全体が覆われている。 A first sprayed film 18a is provided on the first end faces 10e1 and 10e2. Substantially the entire first end faces 10e1 and 10e2 are covered with the first sprayed film 18a.
　第１の金属キャップ１８ｃは、デバイス本体１０の第１の端面１０ｅ１側の部分を覆っている。具体的には、第１の金属キャップ１８ｃは、第１の端面１０ｅ１と、第１及び第２の主面１０ａ１、１０ｂ１並びに第１及び第２の側面１０ｃ１、１０ｄ１のそれぞれの第１の端面１０ｅ１側の部分を覆っている。 The first metal cap 18 c covers a portion on the first end face 10 e 1 side of the device body 10. Specifically, the first metal cap 18c has a first end face 10e1 and a first end face 10e1 of each of the first and second main faces 10a1 and 10b1 and the first and second side faces 10c1 and 10d1. Cover the side part.
　第１の金属キャップ１８ｃと第１の溶射膜１８ａとの間には、第１の導電性接着層１８ｂが設けられている。この第１の導電性接着層１８ｂにより、第１の金属キャップ１８ｃと第１の溶射膜１８ａとが電気的に接続されていると共に、接着されている。 A first conductive adhesive layer 18 b is provided between the first metal cap 18 c and the first sprayed film 18 a. The first metal cap 18c and the first sprayed film 18a are electrically connected and bonded together by the first conductive adhesive layer 18b.
　デバイス本体１０の上には、第２の外部電極１９が設けられている。具体的には、第２の外部電極１９は、第２の端面１０ｆ１、１０ｆ２の上に設けられており、第１の内部電極１１に電気的に接続されている。この第２の外部電極１９と上記第１の外部電極１８とにより機能部１０Ａの外装体１０Ｂからの露出部が覆われている。第２の外部電極１９は、第２の溶射膜１９ａと、第２の導電性接着層１９ｂと、第２の金属キャップ１９ｃとを有する。 A second external electrode 19 is provided on the device body 10. Specifically, the second outer electrode 19 is provided on the second end face 10 f 1, 10 f 2 and is electrically connected to the first inner electrode 11. The exposed portion from the exterior body 10B of the functional portion 10A is covered by the second external electrode 19 and the first external electrode 18. The second external electrode 19 has a second sprayed film 19a, a second conductive adhesive layer 19b, and a second metal cap 19c.
　第２の端面１０ｆ１、１０ｆ２の上には、第２の溶射膜１９ａが設けられている。この第２の溶射膜１９ａにより、第２の端面１０ｆ１、１０ｆ２の実質的に全体が覆われている。 A second sprayed film 19a is provided on the second end faces 10f1 and 10f2. Substantially the entire second end faces 10f1 and 10f2 are covered with the second sprayed film 19a.
　第２の金属キャップ１９ｃは、デバイス本体１０の第２の端面１０ｆ１側の部分を覆っている。具体的には、第２の金属キャップ１９ｃは、第２の端面１０ｆ１と、第１及び第２の主面１０ａ１、１０ｂ１並びに第１及び第２の側面１０ｃ１、１０ｄ１のそれぞれの第２の端面１０ｆ１側の部分を覆っている。 The second metal cap 19 c covers a portion on the second end face 10 f 1 side of the device body 10. Specifically, the second metal cap 19c has a second end face 10f1 and first and second main faces 10a1 and 10b1 and respective second end faces 10f1 of the first and second side faces 10c1 and 10d1. Cover the side part.
　第２の金属キャップ１９ｃと第２の溶射膜１９ａとの間には、第２の導電性接着層１９ｂが設けられている。この第２の導電性接着層１９ｂにより、第２の金属キャップ１９ｃと第２の溶射膜１９ａとが電気的に接続されていると共に、接着されている。 A second conductive adhesive layer 19b is provided between the second metal cap 19c and the second sprayed film 19a. The second metal cap 19c and the second sprayed film 19a are electrically connected and bonded together by the second conductive adhesive layer 19b.
　第１及び第２の溶射膜１８ａ、１９ａは、例えば、Ａｌ、Ｃｕ、Ａｌ－Ｓｉからなる群から選ばれた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 and second sprayed films 18a and 19a can be made of, for example, a metal foil made of at least one metal selected from the group consisting of Al, Cu, and Al-Si.
　第１及び第２の金属キャップ１８ｃ、１９ｃは、例えば、アロイ（Ｆｅ－４２Ｎｉ合金）を含む母材やアルミニウム又はアルミニウム合金からなる母材や、銅または銅合金からなる母材と、これらの母材の外表面を覆うＮｉ／Ａｇめっき、またはＮｉ／Ａｕめっきとにより構成することができる。 The first and second metal caps 18c and 19c are, for example, a base material containing an alloy (Fe-42Ni alloy), a base material made of aluminum or an aluminum alloy, a base material made of copper or a copper alloy, It can be constituted by Ni / Ag plating covering the outer surface of the material or Ni / Au plating.
　ところで、例えば、密着層の端面が平坦である場合は、密着層と溶射膜との接触面積が小さい。このため、デバイス本体と溶射膜との密着性が低い。よって、溶射膜が、デバイス本体から剥離しやすい。溶射膜がデバイス本体から剥離すると、溶射膜が内部電極から剥離する。従って、外部電極と内部電極との接続信頼性が低くなる虞がある。 By the way, for example, when the end face of the adhesion layer is flat, the contact area between the adhesion layer and the thermal spray film is small. Therefore, the adhesion between the device body and the sprayed film is low. Thus, the sprayed film is likely to be peeled off from the device body. When the sprayed film separates from the device body, the sprayed film separates from the internal electrode. Therefore, there is a possibility that the connection reliability between the external electrode and the internal electrode may be lowered.
　一方、蓄電デバイス１では、第１の絶縁層１５ａよりも第１の溶射膜１８ａに対する密着性が高い第１の密着層１４ａが設けられている。このため、第１の溶射膜１８ａとデバイス本体１０との密着性が高められている。さらに、第１の密着層１４ａには、第１の密着層１４ａの端面から長さ方向Ｌにおいて内側に延びる第１の凹部１４ａ１が設けられている。この第１の凹部１４ａ１に、第１の溶射膜１８ａが入り込んでいる。このため、第１の密着層１４ａと第１の溶射膜１８ａとの接合面積が大きい。よって、デバイス本体１０と第１の溶射膜１８ａとの密着性がより高められている。従って、第１の溶射膜１８ａがデバイス本体１０から剥離し難い。このため、第１の溶射膜１８ａが第１の内部電極１１から剥離し難い。よって、蓄電デバイス１では、第１の外部電極１８と第１の内部電極１１との接続信頼性が高い。 On the other hand, in the electric storage device 1, the first adhesion layer 14 a having higher adhesion to the first sprayed film 18 a than the first insulating layer 15 a is provided. Therefore, the adhesion between the first sprayed film 18a and the device body 10 is enhanced. Furthermore, the first adhesive layer 14a is provided with a first recess 14a1 extending inward in the length direction L from the end face of the first adhesive layer 14a. The first sprayed film 18a is intruding into the first recess 14a1. For this reason, the bonding area between the first adhesion layer 14a and the first sprayed film 18a is large. Thus, the adhesion between the device body 10 and the first sprayed film 18a is further enhanced. Therefore, the first sprayed film 18 a is difficult to peel off from the device body 10. Therefore, the first sprayed film 18 a is less likely to be peeled off from the first inner electrode 11. Therefore, in the storage device 1, the connection reliability between the first outer electrode 18 and the first inner electrode 11 is high.
　同様に、蓄電デバイス１では、第１の絶縁層１５ａよりも第２の溶射膜１９ａに対する密着性が高い第２の密着層１４ｂが設けられている。このため、第２の溶射膜１９ａとデバイス本体１０との密着性が高められている。さらに、第２の密着層１４ｂには、第２の密着層１４ｂの端面から長さ方向Ｌにおいて内側に延びる第２の凹部１４ｂ１が設けられている。この第２の凹部１４ｂ１に、第２の溶射膜１９ａが入り込んでいる。このため、第２の密着層１４ｂと第２の溶射膜１９ａとの接合面積が大きい。よって、デバイス本体１０と第２の溶射膜１９ａとの密着性がより高められている。従って、第２の溶射膜１９ａがデバイス本体１０から剥離し難い。このため、第２の溶射膜１９ａが第２の内部電極１２から剥離し難い。よって、蓄電デバイス１では、第２の外部電極１９と第２の内部電極１２との接続信頼性が高い。 Similarly, in the storage device 1, a second adhesion layer 14 b having higher adhesion to the second sprayed film 19 a than the first insulating layer 15 a is provided. Therefore, the adhesion between the second sprayed film 19a and the device body 10 is enhanced. Further, the second adhesion layer 14b is provided with a second recess 14b1 extending inward in the length direction L from the end face of the second adhesion layer 14b. The second sprayed film 19a is intruding into the second recess 14b1. For this reason, the bonding area between the second adhesion layer 14b and the second sprayed film 19a is large. Thus, the adhesion between the device body 10 and the second sprayed film 19a is further enhanced. Therefore, the second sprayed film 19 a is less likely to be peeled off from the device body 10. Therefore, the second sprayed film 19 a is less likely to be peeled off from the second inner electrode 12. Therefore, in the storage device 1, the connection reliability between the second outer electrode 19 and the second inner electrode 12 is high.
　蓄電デバイス１では、第１の密着層１４ａが第１の集電体１１ａの上に設けられており、第１の凹部１４ａ１が、第１の集電体１１ａの長さ方向Ｌにおける第１の端面側端部が第１の密着層１４ａから露出するように設けられている。このため、第１の溶射膜１８ａと第１の集電体１１ａとの接合面積が大きい。よって、第１の溶射膜１８ａが第１の内部電極から剥離し難い。従って、第１の外部電極１８と第１の内部電極１１との接続信頼性をより高めることができる。 In the storage device 1, the first adhesion layer 14a is provided on the first current collector 11a, and the first recess 14a1 is a first in the length direction L of the first current collector 11a. The end face side end portion is provided to be exposed from the first adhesion layer 14a. For this reason, the bonding area between the first sprayed film 18 a and the first current collector 11 a is large. Thus, the first sprayed film 18 a is less likely to be peeled off from the first inner electrode. Therefore, the connection reliability between the first outer electrode 18 and the first inner electrode 11 can be further enhanced.
　同様に、蓄電デバイス１では、第２の密着層１４ｂが第２の集電体１２ａの上に設けられており、第２の凹部１４ｂ１が、第２の集電体１２ａの長さ方向Ｌにおける第１の端面側端部が第２の密着層１４ｂから露出するように設けられている。このため、第２の溶射膜１９ａと第２の集電体１２ａとの接合面積が大きい。よって、第２の溶射膜１９ａが第２の内部電極１２から剥離し難い。従って、第２の外部電極１９と第２の内部電極１２との接続信頼性をより高めることができる。 Similarly, in the electric storage device 1, the second adhesion layer 14b is provided on the second current collector 12a, and the second recess 14b1 is in the length direction L of the second current collector 12a. The first end face side end portion is provided so as to be exposed from the second adhesion layer 14b. For this reason, the bonding area between the second sprayed film 19a and the second current collector 12a is large. Thus, the second sprayed film 19 a is less likely to be peeled off from the second inner electrode 12. Therefore, the connection reliability between the second outer electrode 19 and the second inner electrode 12 can be further enhanced.
　さらに、蓄電デバイス１では、第２の絶縁層１５ｂよりも第１の溶射膜１８ａに対する密着性が高い第３の密着層１４ｃがさらに設けられている。第３の密着層１４ｃには、第３の密着層１４ｃの端面から長さ方向において内側に延びる第３の凹部１４ｃ１が設けられている。この第３の凹部１４ｃ１に、第１の溶射膜１８ａが入り込んでいる。このため、第３の密着層１４ｃと第１の溶射膜１８ａとの接合面積が大きい。よって、デバイス本体１０と第１の溶射膜１８ａとの密着性がさらに高められている。従って、第１の溶射膜１８ａがデバイス本体１０からさらに剥離し難い。このため、第１の溶射膜１８ａが第１の内部電極１１からさらに剥離し難い。よって、蓄電デバイス１では、第１の外部電極１８と第１の内部電極１１との接続信頼性がさらに高い。 Furthermore, in the storage device 1, a third adhesion layer 14 c having a higher adhesion to the first sprayed film 18 a than the second insulating layer 15 b is further provided. The third adhesive layer 14c is provided with a third recess 14c1 extending inward in the length direction from the end face of the third adhesive layer 14c. The first sprayed film 18a is intruding into the third recess 14c1. For this reason, the bonding area between the third adhesion layer 14c and the first sprayed film 18a is large. Thus, the adhesion between the device body 10 and the first sprayed film 18a is further enhanced. Therefore, the first sprayed film 18 a is more difficult to peel off from the device body 10. Therefore, the first sprayed film 18 a is more difficult to peel off from the first inner electrode 11. Therefore, in the storage device 1, the connection reliability between the first outer electrode 18 and the first inner electrode 11 is further high.
　同様に、蓄電デバイス１では、第２の絶縁層１５ｂよりも第２の溶射膜１９ａに対する密着性が高い第４の密着層１４ｄがさらに設けられている。第４の密着層１４ｄには、第４の密着層１４ｄの端面から長さ方向において内側に延びる第４の凹部１４ｄ１が設けられている。この第４の凹部１４ｄ１に、第２の溶射膜１９ａが入り込んでいる。このため、第４の密着層１４ｄと第２の溶射膜１９ａとの接合面積が大きい。よって、デバイス本体１０と第２の溶射膜１９ａとの密着性がさらに高い。従って、第２の溶射膜１９ａがデバイス本体１０からさらに剥離し難い。このため、第２の溶射膜１９ａが第２の内部電極１２からさらに剥離し難い。よって、蓄電デバイス１では、第２の外部電極１９と第２の内部電極１２との接続信頼性がさらに高い。 Similarly, in the storage device 1, a fourth adhesion layer 14 d having a higher adhesion to the second sprayed film 19 a than the second insulating layer 15 b is further provided. The fourth adhesive layer 14d is provided with a fourth recess 14d1 extending inward in the length direction from the end face of the fourth adhesive layer 14d. The second sprayed film 19a is intruding into the fourth recess 14d1. Therefore, the bonding area between the fourth adhesion layer 14d and the second sprayed film 19a is large. Thus, the adhesion between the device body 10 and the second sprayed film 19a is further enhanced. Therefore, the second sprayed film 19 a is more difficult to peel off from the device body 10. For this reason, the second sprayed film 19 a is further less likely to be peeled off from the second inner electrode 12. Therefore, in the storage device 1, the connection reliability between the second outer electrode 19 and the second inner electrode 12 is further high.
　蓄電デバイス１の内部電極１１，１２と、外部電極１８，１９との接続信頼性をより高める観点からは、第１～第４の密着層１４ａ、１４ｂ、１４ｃ、１４ｄのそれぞれが、多孔質層であることが好ましい。この場合、第１～第４の密着層１４ａ、１４ｂ、１４ｃ、１４ｄのそれぞれの表面積が大きくなり、アンカー効果を奏する部分の面積が大きくなるためである。 From the viewpoint of further improving the connection reliability between the internal electrodes 11 and 12 and the external electrodes 18 and 19 of the storage device 1, each of the first to fourth adhesion layers 14a, 14b, 14c and 14d is a porous layer Is preferred. In this case, the surface area of each of the first to fourth adhesion layers 14a, 14b, 14c, and 14d is increased, and the area of the portion exhibiting the anchor effect is increased.
　同様の観点から、第１～第４の密着層１４ａ、１４ｂ、１４ｃ、１４ｄのそれぞれは、カーボン粒子、炭素化合物粒子、金属粒子及び金属酸化物粒子のうちからなる群から選ばれた少なくとも一種の粒子を含むことが好ましい。この場合、第１～第４の密着層１４ａ、１４ｂ、１４ｃ、１４ｄのそれぞれと、第１又は第２の溶射膜１８ａ、１９ａとの物理吸着力又は化学吸着力が大きくなるためである。 From the same viewpoint, each of the first to fourth adhesion layers 14a, 14b, 14c and 14d is at least one selected from the group consisting of carbon particles, carbon compound particles, metal particles and metal oxide particles. It is preferred to include particles. In this case, the physical adsorption force or the chemical adsorption force between each of the first to fourth adhesion layers 14a, 14b, 14c, 14d and the first or second sprayed film 18a, 19a is increased.
　同様の観点から、第１及び第２の集電体１１ａ、１２ａのそれぞれが、金属箔により構成されていることが好ましい。第１及び第２の集電体１１ａ、１２ａのそれぞれが、金属箔により構成されていることにより、第１及び第２の集電体１１ａ、１２ａと溶射膜１８ａ、１９ａとの接合強度を高めることができるためである。 From the same viewpoint, it is preferable that each of the first and second current collectors 11a and 12a be formed of a metal foil. Each of the first and second current collectors 11a and 12a is formed of a metal foil, thereby enhancing the bonding strength between the first and second current collectors 11a and 12a and the thermal spray films 18a and 19a. It is because you can.
　尚、蓄電デバイス１において、凹部１４ａ１、１４ｂ１、１４ｃ１、１４ｄ１は、例えば、例えば、プラズマ処理やブラスト等の物理的なエッチングや、エッチング剤を用いた化学的なエッチング等により形成することができる。具体的には、第１～第４の密着層１４ａ，１４ｂ，１４ｃ，１４ｄを形成した後に、それらの端面にプラズマ処理等のエッチング処理を行い、第１～第４の密着層１４ａ，１４ｂ，１４ｃ，１４ｄの一部を除去することにより、第１～第４の凹部１４ａ１、１４ｂ１、１４ｃ１、１４ｄ１を構成することができる。 In the storage device 1, the concave portions 14 a 1, 14 b 1, 14 c 1, 14 d 1 can be formed, for example, by physical etching such as plasma treatment or blast, or chemical etching using an etching agent. Specifically, after forming the first to fourth adhesion layers 14a, 14b, 14c, 14d, the end faces thereof are subjected to etching treatment such as plasma treatment, and the first to fourth adhesion layers 14a, 14b, The first to fourth recesses 14a1, 14b1, 14c1 and 14d1 can be configured by removing a part of 14c and 14d.
　１　　　：蓄電デバイス
１０　　　：デバイス本体
１０ａ１　：第１の主面
１０ｂ１　：第２の主面
１０ｃ１　：第１の側面
１０ｄ１　：第２の側面
１０ｅ１　：第１の端面
１０ｆ１　：第２の端面
１０Ａ　　：機能部
１０Ｂ　　：外装体
１０ａ２　：第１の主面
１０ｂ２　：第２の主面
１０ｃ２　：第１の側面
１０ｄ２　：第２の側面
１０ｅ２　：第１の端面
１０ｆ２　：第２の端面
１１　　　：第１の内部電極
１１ａ　　：第１の集電体
１１ｂ　　：第１の活物質層
１２　　　：第２の内部電極
１２ａ　　：第２の集電体
１２ｂ　　：第２の活物質層
１３　　　：電解質層
１３ａ　　：第１の電解質層
１３ｂ　　：第２の電解質層
１４ａ　　：第１の密着層
１４ａ１　：第１の凹部
１４ｂ　　：第２の密着層
１４ｂ１　：第２の凹部
１４ｃ　　：第３の密着層
１４ｃ１　：第３の凹部
１４ｄ　　：第４の密着層
１４ｄ１　：第４の凹部
１５　　　：絶縁層
１５ａ　　：第１の絶縁層
１５ｂ　　：第２の絶縁層
１６　　　：接着層
１７　　　：蓄電ユニット
１８　　　：第１の外部電極
１８ａ　　：第１の溶射膜
１８ｂ　　：第１の導電性接着層
１８ｃ　　：第１の金属キャップ
１９　　　：第２の外部電極
１９ａ　　：第２の溶射膜
１９ｂ　　：第２の導電性接着層
１９ｃ　　：第２の金属キャップ 1: storage device 10: device body 10a1: first main surface 10b1: second main surface 10c1: first side surface 10d1: second side surface 10e1: first end surface 10f1: second end surface 10A: functional portion 10B: exterior body 10a2: first main surface 10b2: second main surface 10c2: first side surface 10d2: second side surface 10e2: first end surface 10f2: second end surface 11: first inner electrode 11a First current collector 11b First active material layer 12 Second internal electrode 12a Second current collector 12b Second active material layer 13 Electrolyte layer 13a First electrolyte layer 13b : Second electrolyte layer 14 a: first adhesion layer 14 a 1: first recess 14 b: second adhesion layer 14 b 1: second recess 14 c: third adhesion layer 14 c 1: third recess 14 d: fourth Adhesion layer 14d A fourth recess 15: an insulating layer 15a: a first insulating layer 15b: a second insulating layer 16: an adhesive layer 17: a storage unit 18: a first external electrode 18a: a first sprayed film 18b: a first Conductive adhesive layer 18c: first metal cap 19: second external electrode 19a: second sprayed film 19b: second conductive adhesive layer 19c: second metal cap

Claims (8)

  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、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、幅方向及び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、
    　長さ方向及び幅方向に沿って延び、前記第１の端面に露出した第１の集電体と、前記第１の集電体の上に設けられた第１の活物質層とを有する第１の内部電極と、
    　前記第１の内部電極に対して厚み方向に積層されており、前記第２の端面に露出した第２の集電体と前記第２の集電体の上に設けられた第２の活物質層とを有する第２の内部電極と、
    　前記第１の活物質層と前記第２の活物質層との間に配された電解質層と、
    　前記第１の集電体及び前記電解質層と前記第２の端面とを隔離すると共に、前記第２の集電体及び前記電解質層と前記第１の端面とを隔離するように前記電解質層を包囲して設けられている絶縁層と、
    　を有し、
    　前記第１の外部電極は、前記第１の端面の上に設けられた第１の溶射膜を有し、
    　前記第２の外部電極は、前記第２の端面の上に設けられた第２の溶射膜を有し、
    　前記デバイス本体は、
    　前記絶縁層よりも前記第１の溶射膜に対して高い密着性を有し、前記第１の端面に露出した第１の密着層と、
    　前記絶縁層よりも前記第２の溶射膜に対して高い密着性を有し、前記第２の端面に露出した第２の密着層と、
    　をさらに有し、
    　前記第１の密着層の前記第１の端面に露出している面に、長さ方向において内側に延びる第１の凹部が設けられており、
    　前記第２の密着層の前記第２の端面に露出している面に、長さ方向において内側に延びる第２の凹部が設けられており、
    　前記第１の溶射膜が前記第１の凹部内に入り込んでおり、
    　前記第２の溶射膜が前記第２の凹部内に入り込んでいる、蓄電デバイス。     First and second major surfaces extending along the length and width directions, first and second side surfaces extending along the length and thickness directions, and first extending along the width and thickness directions And a device body having a second end face,
    A first external electrode provided on the device body;
    A second external electrode provided on the device body;
    Equipped with
    The device body is
    A first current collector extending along the length direction and the width direction and exposed to the first end face, and a first active material layer provided on the first current collector; 1 internal electrode,
    A second current collector which is stacked in the thickness direction with respect to the first internal electrode, and is exposed on the second end face, and a second active material provided on the second current collector A second inner electrode having a layer;
    An electrolyte layer disposed between the first active material layer and the second active material layer;
    The electrolyte layer is separated so as to separate the first current collector and the electrolyte layer from the second end face, and to separate the second current collector and the electrolyte layer from the first end face. An insulating layer provided to surround it,
    Have
    The first external electrode has a first sprayed film provided on the first end face,
    The second external electrode has a second sprayed film provided on the second end face,
    The device body is
    A first adhesion layer which has higher adhesion to the first sprayed film than the insulating layer and which is exposed at the first end face;
    A second adhesion layer having higher adhesion to the second sprayed film than the insulating layer and exposed to the second end face;
    And have
    The surface of the first adhesive layer exposed to the first end face is provided with a first recess extending inward in the longitudinal direction,
    The surface of the second adhesive layer exposed to the second end surface is provided with a second recess extending inward in the longitudinal direction,
    The first sprayed film is in the first recess,
    An electricity storage device, wherein the second sprayed film is in the second recess.
  2. 　前記第１の密着層が前記第１の集電体の上に設けられており、
    　前記第１の凹部は、前記第１の集電体の長さ方向における前記第１の端面側端部が前記第１の密着層から露出するように設けられており、
    　前記第２の密着層が前記第２の集電体の上に設けられており、
    　前記第２の凹部は、前記第２の集電体の長さ方向における前記第２の端面側端部が前記第２の密着層から露出す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 adhesion layer is provided on the first current collector,
    The first concave portion is provided such that the first end face side end portion in the lengthwise direction of the first current collector is exposed from the first adhesive layer,
    The second adhesion layer is provided on the second current collector,
    The second concave portion is provided so that the second end face side end portion in the length direction of the second current collector is exposed from the second adhesive layer. Power storage device.
  3. 　厚み方向において、前記第１の密着層が前記第１の活物質層と同位置に位置している部分を含み、かつ、前記第１の密着層と前記第１の活物質層とが同じ材料により構成されており、
    　厚み方向において、前記第２の密着層が前記第２の活物質層と同位置に位置している部分を含み、かつ、前記第２の密着層と前記第２の活物質層とが同じ材料により構成されている、請求項１又は２に記載の蓄電デバイス。     In the thickness direction, the first adhesion layer includes a portion located at the same position as the first active material layer, and the first adhesion layer and the first active material layer are the same material Is composed of
    In the thickness direction, the second adhesive layer includes a portion located at the same position as the second active material layer, and the second adhesive layer and the second active material layer are the same material The electrical storage device according to claim 1 or 2, which is configured by:
  4. 　前記デバイス本体は、
    　前記絶縁層よりも前記第１の溶射膜に対して高い密着性を有し、前記第１の端面に露出した第３の密着層と、
    　前記絶縁層よりも前記第２の溶射膜に対して高い密着性を有し、前記第２の端面に露出した第４の密着層と、
    　をさらに有し、
    　前記第３の密着層の前記第１の端面に露出している面に、長さ方向において内側に延びる第３の凹部が設けられており、
    　前記第４の密着層の前記第２の端面に露出している面に、長さ方向において内側に延びる第４の凹部が設けられており、
    　前記第３の溶射膜が前記第３の凹部内に入り込んでおり、
    　前記第４の溶射膜が前記第４の凹部内に入り込んでおり、
    　厚み方向において、前記第３の密着層が前記第２の活物質層と同位置に位置している部分を含み、かつ、前記第３の密着層と前記第２の活物質層とが同じ材料により構成されており、
    　厚み方向において、前記第４の密着層が前記第１の活物質層と同位置に位置している部分を含み、かつ、前記第４の密着層と前記第１の活物質層とが同じ材料により構成されている、請求項１～３のいずれか一項に記載の蓄電デバイス。     The device body is
    A third adhesion layer which has higher adhesion to the first sprayed film than the insulating layer and is exposed to the first end face;
    A fourth adhesion layer which has higher adhesion to the second sprayed film than the insulating layer and is exposed to the second end face;
    And have
    A third recess extending inward in the longitudinal direction is provided on the surface of the third adhesive layer exposed to the first end face,
    The surface of the fourth adhesive layer exposed to the second end face is provided with a fourth recess extending inward in the longitudinal direction,
    The third sprayed film is in the third recess,
    The fourth sprayed film is in the fourth recess,
    In the thickness direction, the third adhesive layer includes a portion located at the same position as the second active material layer, and the third adhesive layer and the second active material layer are the same material Is composed of
    In the thickness direction, the fourth adhesive layer includes a portion located at the same position as the first active material layer, and the fourth adhesive layer and the first active material layer are the same material The power storage device according to any one of claims 1 to 3, which is configured by:
  5. 　前記密着層のそれぞれが、多孔質層である、請求項１～４のいずれか一項に記載の蓄電デバイス。 The power storage device according to any one of claims 1 to 4, wherein each of the adhesion layers is a porous layer.
  6. 　前記密着層のそれぞれは、カーボン粒子、炭素化合物粒子、金属粒子及び金属酸化物粒子のうちからなる群から選ばれた少なくとも一種の粒子を含む、請求項１～５のいずれか一項に記載の蓄電デバイス。 6. The adhesive layer according to any one of claims 1 to 5, wherein each of the adhesion layers includes at least one particle selected from the group consisting of carbon particles, carbon compound particles, metal particles and metal oxide particles. Power storage device.
  7. 　前記第１及び第２の集電体のそれぞれが、金属箔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 power storage device according to any one of claims 1 to 6, wherein each of the first and second current collectors is made of a metal foil.
  8. 　前記絶縁層が前記第１及び第２の端面に露出している、請求項１～７のいずれか一項に記載の蓄電デバイス。 The power storage device according to any one of claims 1 to 7, wherein the insulating layer is exposed at the first and second end faces.
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