WO2020022022A1 - Electricity storage device - Google Patents

Electricity storage device Download PDF

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Publication number
WO2020022022A1
WO2020022022A1 PCT/JP2019/026665 JP2019026665W WO2020022022A1 WO 2020022022 A1 WO2020022022 A1 WO 2020022022A1 JP 2019026665 W JP2019026665 W JP 2019026665W WO 2020022022 A1 WO2020022022 A1 WO 2020022022A1
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WO
WIPO (PCT)
Prior art keywords
electrode
face
power storage
terminal
conductive
Prior art date
Application number
PCT/JP2019/026665
Other languages
French (fr)
Japanese (ja)
Inventor
野田知宏
神頭将之
Original Assignee
株式会社村田製作所
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Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2020022022A1 publication Critical patent/WO2020022022A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/224—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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
    • Y02E60/13—Energy storage using capacitors
    • 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.
  • an electric double layer capacitor is widely used in various electronic devices such as mobile phones. Unlike a secondary battery, an electric double layer capacitor does not involve a chemical reaction at the time of charge and discharge, and thus has an excellent charge / discharge cycle life, and is capable of performing charge / discharge in a short time with a large current.
  • Patent Document 1 describes an electric double layer capacitor having a structure in which an electric double layer capacitor element serving as a power storage element is housed in a concave container.
  • a pair of electrodes constituting an electric double layer capacitor element are laminated via a separator, and are electrically connected to a pair of external electrodes provided on the bottom surface of the concave container, respectively. That is, the pair of electrodes of the electric double layer capacitor element are electrically connected to an external circuit via the pair of external electrodes, so that the electric double layer capacitor element can be charged and discharged.
  • an electrode located above in the stacking direction among a pair of electrodes constituting the electric double-layer capacitor element is provided on a lid that covers an upper portion of the concave container. It is electrically connected to an external electrode provided on the bottom surface of the concave container via a metal layer and a through electrode penetrating from the upper surface to the lower surface of the concave container.
  • An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a power storage device in which a conductive path between a power storage element and an external electrode provided in a storage container is shortened to reduce an equivalent series resistance.
  • the power storage device of the present invention includes: A storage element, A housing container for housing the power storage element, A conductive portion that electrically connects the power storage element and an external electrode provided in the storage container, With The electricity storage element, A first main surface and a second main surface extending along the length direction and the width direction; a first side surface and a second side surface extending along the length direction and the thickness direction; A first end surface and a second end surface extending along the thickness direction; A first internal electrode and a second internal electrode, wherein a plurality of the first internal electrodes and the second internal electrodes are alternately stacked in the thickness direction; A first end face electrode provided on the first end face and connected to the plurality of first internal electrodes; a second end face provided on the second end face and connected to the plurality of second internal electrodes; 2 end face electrodes,
  • the storage container A first terminal provided on an inner bottom surface that is a surface facing the second main surface of the power storage element; A first external electrode provided on an outer bottom surface opposite to the inner bottom surface and electrically connected
  • the first conductive resin and the second conductive resin may contain a conductive filler containing at least one selected from the group consisting of copper and nickel.
  • the surface of the conductive filler may be coated with any of gold, silver, and platinum.
  • the first conductive resin and the second conductive resin contain a conductive filler containing silver
  • the first end face electrode and the second end face electrode each include at least one selected from the group consisting of Au, Ni, Pt, Cu, Ti, Cr, Co, Mn, and C;
  • a conductive film containing an alloy containing a seed may be formed.
  • the container includes a first via conductor that connects the first terminal to the first external electrode, a second via conductor that connects the second terminal to the second external electrode, Is further provided, When viewed in the thickness direction, the first via conductor is disposed at a position where at least a part thereof overlaps the first end face electrode, and at least a part of the second via conductor is the second terminal conductor. It may be arranged at a position overlapping the second end face electrode.
  • the first conductive resin is sandwiched between the first end surface electrode and an inner side surface of the storage container facing the first end surface electrode
  • the second conductive resin is The second end face electrode may be sandwiched between the second end face electrode and an inner side face of the container facing the second end face electrode.
  • the storage container has a bottomed cylindrical shape having an opening at one end,
  • the storage container may further include a metal lid for sealing the opening.
  • the storage container has a bottomed cylindrical shape having an opening at one end, Further comprising a metal lid for sealing the opening of the storage container,
  • the insulating resin covering the first main surface of the power storage element may be sandwiched between the first main surface and the metal lid.
  • the first end face of the electric storage element is provided with the first end face electrode connected to the plurality of first internal electrodes, and the second end face is provided with the plurality of second internal electrodes.
  • a connected second end face electrode is provided.
  • a first terminal and a second terminal are provided on an inner bottom surface of the container, and a first external electrode and a second terminal electrically connected to the first terminal are provided on the outer bottom surface.
  • a second external electrode is provided which is electrically connected. Then, the first end face electrode and the first terminal are electrically connected by the first conductive resin, and the second end face electrode and the second terminal are electrically connected by the second conductive resin. Electrically connected.
  • FIG. 2 is a schematic cross-sectional view of the electric double-layer capacitor shown in FIG. 1 along the line II-II. It is a figure which shows the contact resistance between conductive resin and aluminum at the time of using a silver filler, a copper filler, and a nickel filler as a conductive filler, respectively. It is a typical sectional view showing the composition of the electric double layer capacitor in a 2nd embodiment.
  • the figure which shows the contact resistance with the conductive resin containing a silver filler about the case where a gold
  • an electric double layer capacitor will be described as an example of the power storage device of the present invention.
  • the power storage device is not limited to an electric double layer capacitor, and may be a multilayer ceramic capacitor or the like.
  • FIG. 1 is a schematic perspective view showing the configuration of the electric double layer capacitor 100 according to the first embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view of the electric double layer capacitor 100 shown in FIG. 1 along the line II-II.
  • L indicates the length direction
  • W indicates the width direction
  • T indicates the thickness direction (the laminating direction of the internal electrodes).
  • the electric double-layer capacitor 100 includes an electric double-layer capacitor element 10, a housing 20, a first conductive resin 30a, a second conductive resin 30b, a lid 40, and a seam ring. 50.
  • the electric double layer capacitor element 10 serving as a power storage element has a substantially rectangular parallelepiped shape, and includes a first main surface 10a and a second main surface 10b, a first side surface and a second side surface, and a first end surface 10c. And a second end face 10d.
  • the first main surface 10a and the second main surface 10b extend along the length direction L and the width direction W.
  • the first side surface and the second side surface extend along the length direction L and the thickness direction T.
  • the first end face 10c and the second end face 10d extend along the width direction W and the thickness direction T.
  • the first main surface 10a and the second main surface 10b, the first side surface and the second side surface, the first end surface 10c and the second end surface 10d correspond to the "surface" of the present invention.
  • the “cuboid shape” includes a shape in which a corner or a ridge is chamfered or a shape in which the corner or the ridge is rounded.
  • a corner portion is a portion where three surfaces of the electric double layer capacitor element 10 intersect, and a ridge portion is a portion where two surfaces of the electric double layer capacitor element 10 intersect.
  • the electric double layer capacitor element 10 has a structure in which a plurality of first internal electrodes 11 and second internal electrodes 12 are alternately stacked via an electrolyte layer 13. That is, the plurality of first internal electrodes 11 and the plurality of second internal electrodes 12 are alternately stacked via the electrolyte layer 13.
  • the number of layers is preferably three or more.
  • the plurality of first internal electrodes 11 are drawn out to the first end face 10c of the electric double layer capacitor element 10, but are not drawn out to the first side face, the second side face, and the second end face 10d.
  • the plurality of second internal electrodes 12 are led out to a second end face 10d opposite to the first end face 10c of the electric double layer capacitor element 10, while the first side face, the second side face, and the second The first end face 10c is not drawn out.
  • the first end face 10c and the second end face 10d are surfaces orthogonal to the main surfaces of the first internal electrode 11 and the second internal electrode 12.
  • the first end face 10c and the second end face 10d are faces opposed in the length direction L of the electric double layer capacitor element 10.
  • the first end face 10c and the second end face 10d may be surfaces facing the width direction W of the electric double layer capacitor element 10.
  • the first internal electrode 11 has a first current collector 11a and a first active material layer 11b.
  • the first current collector 11a is, for example, a metal foil made of at least one metal such as aluminum and copper.
  • metal includes an alloy.
  • the first active material layer 11b is provided on both surfaces of the first current collector 11a. However, when the first internal electrode 11 exists in the outermost layer in the thickness direction T, the first current collector 11a of the first internal electrode 11 is provided with the first active material layer 11b only on one surface. Have been.
  • the first active material layer 11b contains an active material.
  • the first active material layer 11b is a polarizable electrode, and preferably contains, for example, a carbon material such as activated carbon as an active material.
  • the second internal electrode 12 has a second current collector 12a and a second active material layer 12b.
  • the second current collector 12a is, for example, a metal foil made of at least one metal such as aluminum and copper.
  • metal includes an alloy.
  • the second active material layer 12b is provided on both surfaces of the second current collector 12a. However, when the second internal electrode 12 exists in the outermost layer in the thickness direction T, the second current collector 12a of the second internal electrode 12 is provided with the second active material layer 12b only on one surface. Have been.
  • the second active material layer 12b contains an active material.
  • the second active material layer 12b is a polarizable electrode, and preferably 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 11b of the first internal electrode 11 and the second active material layer 12b of the second internal electrode 12.
  • the electrolyte layer 13 is a layer containing an electrolyte.
  • the electrolyte layer 13 may be made of a gel electrolyte which is a gel electrolyte, or may be made of a porous body such as a separator impregnated with an electrolyte.
  • Specific examples of the gel electrolyte include, for example, polymer polyethylene oxide containing an electrolyte.
  • the electrolyte examples include an ionic liquid such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or the like.
  • EMITFSI 1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide
  • EMIBF4 1-ethyl-3-methylimidazolium borofluoride
  • a solution obtained by dissolving the ionic liquid in an organic solvent such as propylene carbonate or acetonitrile can be used.
  • One of these electrolytes may be used alone, or a plurality of them may be mixed and used.
  • first internal electrodes 11 only the first current collector 11a is exposed on the first end face 10c. Also, of the second internal electrodes 12, only the second current collector 12a is exposed on the second end face 10d. The first active material layer 11b of the first internal electrode 11, the second active material layer 12b of the second internal electrode 12, and the electrolyte layer 13 are exposed on the first end face 10c and the second end face 10d. I haven't.
  • first active material layer 11b Between the first active material layer 11b, the second active material layer 12b, and the electrolyte layer 13, and each of the first end face 10c, the second end face 10d, the first side face, and the second side face Is provided with an insulating layer 16. Due to the insulating layer 16, the first active material layer 11b, the second active material layer 12b, and the electrolyte layer 13 are formed on the first end face 10c, the second end face 10d, the first side face, and the second side face, respectively. Is isolated from
  • the insulating layer 16 is made of, for example, urethane resin, acrylic resin, epoxy resin, polyimide resin, silicon resin, or the like.
  • the first end face electrode 14 is provided on the first end face 10 c of the electric double layer capacitor element 10.
  • the first end face electrode 14 is electrically connected to the plurality of first internal electrodes 11.
  • a second end face electrode 15 is provided on the second end face 10d.
  • the second end face electrode 15 is electrically connected to the plurality of second internal electrodes 12. That is, the plurality of first internal electrodes 11 and the plurality of second internal electrodes 12 are connected in parallel. Thereby, high output density of the electric double layer capacitor element 10 can be realized.
  • the first end face electrode 14 and the second end face electrode 15 are made of, for example, aluminum. In that case, the first end face electrode 14 and the second end face electrode 15 can be formed by aluminum spraying.
  • the container 20 has a concave portion for accommodating the electric double layer capacitor element 10.
  • the storage container 20 is a bottomed cylindrical housing having an opening at one end, a bottom surface facing the opening, and a side wall extending substantially perpendicularly from the bottom surface.
  • the storage container 20 is made of an insulating material, and in this embodiment, is made of, for example, a ceramic material.
  • the storage container 20 includes four side walls: a first side wall 20c, a second side wall 20d, a third side wall, and a fourth side wall.
  • the distance in the thickness direction T of the side wall which is the height of the side wall, is larger than the distance in the thickness direction T of the electric double layer capacitor element 10.
  • a first terminal 21 and a second terminal 22 are provided on an inner bottom surface 20a which is a bottom surface of the container 20 and is a surface on the opening side.
  • the inner bottom surface 20a is a surface facing the second main surface 10b of the electric double layer capacitor element 10.
  • one end of the first terminal 21 is in contact with the first side wall 20c of the storage container 20, and one end of the second terminal 22 is in contact with the second side wall 20d of the storage container 20. ing.
  • the first side wall 20c is a side wall facing the first end face 10c of the electric double layer capacitor element 10 among the four side walls of the container 20, and the second side wall 20d is a side wall of the electric double layer capacitor element.
  • 10 is a side wall facing the second end face 10d.
  • the third side wall is a side wall facing the third end face of the electric double layer capacitor element 10
  • the fourth side wall is a side wall facing the fourth end face of the electric double layer capacitor element 10.
  • first external electrode 23 and a second external electrode 24 are provided on an outer bottom surface 20b which is a surface opposite to the inner bottom surface on the bottom surface of the housing container 20.
  • the first external electrode 23 is electrically connected to the first terminal 21 via the first via conductor 25.
  • the second external electrode 24 is electrically connected to the second terminal 22 via the second via conductor 26.
  • first via conductors 25 are provided side by side in the width direction W on the first side wall 20 c side of the bottom surface of the storage container 20.
  • second via conductors 26 are provided side by side in the width direction W on the second side wall 20 d side of the bottom surface of the storage container 20.
  • the number of first via conductors 25 and second via conductors 26 is not limited to three.
  • the first via conductor 25 When viewed in the thickness direction T, the first via conductor 25 is disposed at a position where at least a part thereof overlaps the first end face electrode 14, and the second via conductor 26 has at least a part thereof Are arranged at positions overlapping with the end face electrodes 15.
  • a conductive path from the first end face electrode 14 to the first external electrode 23 via the first terminal 21 and the first via conductor 25, and the second end face electrode 15 Therefore, the conductive path to the second external electrode 24 via the second terminal 22 and the second via conductor 26 can be shortened, and the equivalent series resistance of the electric double layer capacitor 100 can be reduced. it can.
  • a conductive part as a conductive part for electrically connecting the electric double layer capacitor element 10, the first external electrode 23 and the second external electrode 24 is provided. Resin is provided. More specifically, at least a portion between the first end face electrode 14 and the first side wall 20c of the storage container 20 facing the first end face electrode 14, and the first end face electrode 14, A first conductive resin 30a is provided in a part between the one end face electrode 14 and the inner bottom surface 20a of the storage container 20 facing the same.
  • a second conductive resin 30b is provided in a part between the inner container 15 and the inner bottom surface 20a of the opposite container 20.
  • the first conductive resin 30a provided on the first end face electrode 14 side is provided between the first end face electrode 14 and the inner side face of the first side wall 20c on the side of the electric double layer capacitor element. It is sandwiched. Further, the second conductive resin 30b provided on the second end face electrode 15 side is formed between the second end face electrode 15 and the inner side face which is the face of the second side wall 20d on the electric double layer capacitor element side. It is sandwiched between.
  • the first conductive resin 30a and the second conductive resin 30b are provided, the electric double layer capacitor is provided via the first conductive resin 30a and the second conductive resin 30b.
  • the fixability between the element 10 and the container 20 can be improved. That is, the first conductive resin 30a and the second conductive resin 30b also have a function as an adhesive.
  • the first conductive resin 30a functioning as a conductive part electrically connects the first end face electrode 14 and the first terminal 21.
  • the second conductive resin 30b which also functions as a conductive portion, electrically connects between the second end face electrode 15 and the second terminal 22.
  • the plurality of first internal electrodes 11 of the electric double layer capacitor element 10 are connected via the first end face electrode 14, the first conductive resin 30a, the first terminal 21, and the first via conductor 25. And is electrically connected to the first external electrode 23. Further, the plurality of second internal electrodes 12 are connected to the second external electrode via the second end face electrode 15, the second conductive resin 30b, the second terminal 22, and the second via conductor 26. 24 is electrically connected.
  • the first conductive resin 30a and the second conductive resin 30b are obtained by hardening a fluid conductive paste.
  • a resin paste containing a conductive filler can be used.
  • a silver filler having high conductivity and being chemically stable can be used.
  • an epoxy resin can be used as the resin paste.
  • the conductive filler is not limited to the silver filler, and for example, a conductive filler containing at least one selected from the group consisting of copper and nickel may be used.
  • a conductive filler containing at least one selected from the group consisting of copper and nickel may be used.
  • copper and nickel are used as conductive fillers contained in the first conductive resin 30a and the second conductive resin 30b for the following reason. It is preferable to use a conductive filler containing at least one selected from the group consisting of:
  • FIG. 3 is a diagram showing the contact resistance between the conductive resin and aluminum when a silver filler, a copper filler, and a nickel filler are used as the conductive filler, respectively.
  • a silver filler, a copper filler, and a nickel filler are used as the conductive filler, respectively.
  • five conductive resin samples formed using a resin paste containing a silver filler, a copper filler, and a nickel filler, respectively, were prepared, and the contact resistance between aluminum and aluminum was measured. The average and variation were determined.
  • the contact resistance of the conductive resin containing the copper filler and the conductive resin containing the nickel filler is smaller than the contact resistance of the conductive resin containing the silver filler, and the variation is small.
  • silver has a high contact resistance with aluminum and a large variation in contact resistance.
  • copper and nickel have lower contact resistance with aluminum than silver, and have less variation in contact resistance. Therefore, when the first end face electrode 14 and the second end face electrode 15 are made of aluminum, as the conductive filler contained in the resin paste for forming the first conductive resin 30a and the second conductive resin 30b, It is preferred to use a conductive filler containing at least one selected from the group consisting of copper and nickel.
  • the output characteristics of the electric double layer capacitor 100 are improved by reducing the contact resistance between the first end face electrode 14 and the second end face electrode 15. In addition, since the variation in the contact resistance is reduced, the quality stability of the electric double layer capacitor 100 is improved. Further, copper and nickel are inexpensive as compared with silver, so that the cost can be reduced.
  • the surface of the conductive filler is coated with gold, silver, or platinum. You may make it. The coating may be performed on the entire surface of the conductive filler, or may be performed on a part thereof. Since gold, silver, and platinum have high resistance to an electrolytic solution and are chemically stable, it is more preferable to coat the surface of the conductive filler with one of gold, silver, and platinum.
  • the linear expansion coefficients of the first conductive resin 30a and the second conductive resin 30b are smaller than the linear expansion coefficients of the first end face electrode 14 and the second end face electrode 15, and It is larger than the coefficient of linear expansion. Therefore, the first conductive resin 30a is provided between the first end surface electrode 14 and the housing container 20, and the second conductive resin 30b is provided between the second end surface electrode 15 and the housing container 20. As a result, the coefficient of linear expansion changes stepwise, and it is possible to absorb deformation when heat is applied during mounting.
  • the lid 40 is provided to seal the opening above the storage container 20.
  • a seam ring 50 is provided between the lid 40 and the storage container 20, and can prevent moisture and the like from entering the interface between the lid 40 and the storage container 20.
  • the lid 40 is made of metal. When the lid 40 is made of metal, airtightness can be easily obtained as compared with the case where the lid 40 is made of ceramic.
  • the first end face 10 c of the electric double layer capacitor element 10 has the first end face electrode electrically connected to the plurality of first internal electrodes 11.
  • the second end face electrode 15 electrically connected to the plurality of second internal electrodes 12 is formed on the second end face 10d.
  • a first terminal 21 and a second terminal 22 are provided on the inner bottom surface 20a of the housing container 20, and a first external terminal electrically connected to the first terminal 21 is provided on the outer bottom surface 20b.
  • An electrode 23 and a second external electrode 24 that is electrically connected to the second terminal 22 are provided.
  • the first terminal 21 and the first end face electrode 14 are electrically connected via the first conductive resin 30a, and the second terminal 22 and the second end face electrode 15 are connected to the second conductive face. It is electrically connected via the conductive resin 30b.
  • the conductive paths between the plurality of first internal electrodes 11 and the first external electrodes 23 and between the plurality of second internal electrodes 12 and the second external electrodes 24 are shortened. And the equivalent series resistance of the electric double layer capacitor 100 can be reduced. Thus, the output characteristics of the electric double layer capacitor 100 can be improved.
  • the first end face electrode 14 and the first terminal 21 are connected by a first conductive resin 30a, and the second end face electrode 15 and the second terminal 22 are connected by a second conductive material. Since the connection is made by the resin 30b, the gap between the electric double layer capacitor element 10 and the housing container 20 can be made smaller than in the case where the connection is made by a connection portion formed by welding or thermal spraying. Therefore, the size of the electric double layer capacitor element 10 can be made as large as possible with respect to the volume of the storage container 20, so that the capacity and output of the electric double layer capacitor 100 can be increased.
  • FIG. 4 is a schematic cross-sectional view illustrating a configuration of an electric double layer capacitor 100A according to the second embodiment.
  • the electric double layer capacitor 100A according to the second embodiment is different from the electric double layer capacitor 100 according to the first embodiment shown in FIG.
  • the first conductive resin 30a and the second conductive resin 30b will be described as those obtained by curing a resin paste containing a silver filler.
  • the conductive film 60 is opposed to the inner side surface of the first side wall 20 c of the housing container 20, and faces the surface of the first end face electrode 14 and the inner side surface of the second side wall 20 d of the housing container 20. Are provided on the surface of the end surface electrode 15.
  • the conductive film 60 is a thin film having a thickness of, for example, 100 nm or more and 300 nm or less, and is at least one selected from the group consisting of Au, Ni, Pt, Cu, Ti, Cr, Co, Mn, and C, or at least one of Contains an alloy containing seeds.
  • the conductive film 60 can be formed by, for example, sputtering.
  • the conductive film 60 may be formed after performing reverse sputtering on the surfaces of the first end face electrode 14 and the second end face electrode 15.
  • the oxide film of the first end face electrode 14 and the second end face electrode 15 can be removed, and the first end face can be removed.
  • the adhesion between the electrode 14 and the second end face electrode 15 and the conductive film 60 can be improved.
  • FIG. 5 shows the contact resistance between a thin film in the case where a thin film of Au (gold) is provided on the surface of aluminum and a conductive resin formed using a resin paste containing a silver filler, and the contact resistance between the thin film and the surface of aluminum. It is a figure which shows the contact resistance between the aluminum which does not provide a thin film of Au, and the conductive resin formed using the resin paste containing a silver filler. Here, five samples were prepared, and the average value and the variation of the contact resistance were determined.
  • a silver filler is used as a conductive filler included in a resin paste for forming the first conductive resin 30a and the second conductive resin 30b, and the first end face electrode 14 and the second end face electrode 15 are used.
  • a silver filler is used as a conductive filler included in a resin paste for forming the first conductive resin 30a and the second conductive resin 30b, and the first end face electrode 14 and the second end face electrode 15 are used.
  • contact between the first conductive resin 30a and the first end face electrode 14 and between the second conductive resin 30b and the second end face electrode 15 are made. Resistance increases.
  • the Au thin film and the first conductive resin 30a and the second conductive resin 30b formed by using a resin paste containing a silver filler are used.
  • the contact resistance is low and the variation is small. Therefore, by forming the conductive film 60 containing Au on the surface of the first end face electrode 14 and the surface of the second end face electrode 15 made of aluminum, the contact resistance is reduced and the variation in the contact resistance is reduced. be able to.
  • a thin film made of Ni, Pt, Cu, Ti, Cr, Co, Mn, C, or an alloy containing them is formed instead of the Au thin film.
  • the electric double layer capacitor 100A in the second embodiment Au, Ni, Pt, Cu, Ti, Cr, Co, and the like are formed on the surface of the first end surface electrode 14 and the surface of the second end surface electrode 15. Since the conductive film 60 containing at least one selected from the group consisting of Mn and C or an alloy containing the at least one type is formed, compared to a configuration in which the conductive film 60 is not formed, The contact resistance between the first conductive resin 30a and the second conductive resin 30b can be reduced, and the variation in the contact resistance can be reduced. Thus, the output characteristics of the electric double layer capacitor 100A can be further improved, and the quality stability of the electric double layer capacitor 100A can be further improved.
  • FIG. 6 is a schematic cross-sectional view illustrating a configuration of an electric double layer capacitor 100B according to the third embodiment.
  • the first conductive resin 30a and the second conductive resin 30b of the first end face 10c and the second end face 10d of the electric double layer capacitor element 10 are different from each other. It differs from the electric double layer capacitor 100 in the first embodiment in that the portion not provided and the first main surface 10a, the first side surface, and the second side surface are covered with the insulating resin 70. .
  • the insulating resin 70 is provided so as to fill the gap.
  • the insulating resin 70 is provided between the electric double layer capacitor element 10 and the housing 20 and between the electric double layer capacitor element 10 and the lid 40.
  • the insulating resin 70 can be formed by the following method. That is, after the electric double layer capacitor element 10 is accommodated in the container 20, an insulating liquid resin is poured so as to cover the electric double layer capacitor element 10. As the liquid resin, for example, an epoxy resin or a silicone resin can be used. The poured liquid resin enters a gap between the storage container 20 and the electric double layer capacitor element 10. Further, the upper surface of the electric double layer capacitor element 10 is covered with a liquid resin. Thereafter, the liquid resin is cured by heating. Thus, the insulating resin 70 is formed. The liquid resin may be cured by leaving it for a predetermined time without heating.
  • the electric double layer capacitor 100B of the third embodiment since the electric double layer capacitor element 10 is covered with the insulating resin 70, the electrolyte leaked from the electric double layer capacitor element 10 for some reason. Even in this case, it is possible to suppress the electrolytic solution from adhering to the first conductive resin 30a and the second conductive resin 30b, and to the first terminal 21 and the second terminal 22 of the container 20. Thereby, corrosion due to the electrolytic solution adhering to the conductive resin 30 and the first terminal 21 and the second terminal 22 can be suppressed, and the reliability of the electric double layer capacitor 100B can be improved.
  • the electric double layer capacitor element 10 and the storage container 20 can be more firmly fixed by the insulating resin 70, when the electric double layer capacitor 100B is shocked, the electric double layer capacitor element 10 Disconnection due to detachment from the storage container 20 can be suppressed.
  • the gap between the electric double layer capacitor element 10 and the lid 40 for example, between the first end face electrode 14 and the lid 40, or between the second end face electrode 15 and the lid 40 is formed. Shorting can be suppressed.
  • the electric double layer capacitor element 10 is not limited to the above-described configuration as long as the electric double layer capacitor element 10 has a structure in which a plurality of first internal electrodes 11 and second internal electrodes 12 are alternately stacked.

Abstract

This electricity storage device (an electric double layer capacitor 100) is provided with an electricity storage element (an electric double layer capacitor element 10), a container 20 and a conductive part. The electricity storage element is provided with: first internal electrodes 11 and second internal electrodes 12; a first end face electrode 14 which is provided on a first end face and is electrically connected to the plurality of first internal electrodes 11; and a second end face electrode 15 which is provided on a second end face and is electrically connected to the plurality of second internal electrodes 12. The container 20 is provided with: a first terminal 21 and a second terminal 22, which are provided on the inner bottom surface; and a first external electrode 23 and a second external electrode 24, which are provided on the outer bottom surface, and which are electrically connected to the first terminal and the second terminal, respectively. The conductive part is provided with: a first conductive resin 30a which electrically connects the first end face electrode and the first terminal to each other; and a second conductive resin 30b which electrically connects the second end face electrode and the second terminal to each other.

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、電気化学キャパシタ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、携帯電話などの種々の電子機器などには電気二重層キャパシタが広く使用されている。電気二重層キャパシタは、二次電池と異なり、充放電に際して化学反応を伴わないため、充放電サイクル寿命に優れ、大電流で短時間のうちに充放電を行うことができるという特徴がある。 Conventionally, various power storage devices such as electrochemical capacitors and secondary batteries are known. For example, electric double layer capacitors are widely used in various electronic devices such as mobile phones. Unlike a secondary battery, an electric double layer capacitor does not involve a chemical reaction at the time of charge and discharge, and thus has an excellent charge / discharge cycle life, and is capable of performing charge / discharge in a short time with a large current.
　特許文献１には、蓄電素子である電気二重層キャパシタ素子を凹状容器に収容した構造の電気二重層キャパシタが記載されている。この電気二重層キャパシタでは、電気二重層キャパシタ素子を構成する一対の電極がセパレータを介して積層されており、凹状容器の底面に設けられた一対の外部電極とそれぞれ電気的に接続されている。すなわち、電気二重層キャパシタ素子の一対の電極は、一対の外部電極を介して外部の回路と電気的に接続されて、電気二重層キャパシタ素子が充放電可能に構成されている。 Patent Document 1 describes an electric double layer capacitor having a structure in which an electric double layer capacitor element serving as a power storage element is housed in a concave container. In this electric double layer capacitor, a pair of electrodes constituting an electric double layer capacitor element are laminated via a separator, and are electrically connected to a pair of external electrodes provided on the bottom surface of the concave container, respectively. That is, the pair of electrodes of the electric double layer capacitor element are electrically connected to an external circuit via the pair of external electrodes, so that the electric double layer capacitor element can be charged and discharged.
特開２０１２－４４０７４号公報JP 2012-44074 A
　しかしながら、特許文献１に記載の電気二重層キャパシタでは、電気二重層キャパシタ素子を構成する一対の電極のうち、積層方向の上方に位置する電極は、凹状容器の上部を覆う蓋に設けられている金属層、および、凹状容器の上面から下面へと貫通する貫通電極を介して、凹状容器の底面に設けられている外部電極と電気的に接続されている。 However, in the electric double-layer capacitor described in Patent Literature 1, an electrode located above in the stacking direction among a pair of electrodes constituting the electric double-layer capacitor element is provided on a lid that covers an upper portion of the concave container. It is electrically connected to an external electrode provided on the bottom surface of the concave container via a metal layer and a through electrode penetrating from the upper surface to the lower surface of the concave container.
　このように、蓄電素子と収容容器に設けられている外部電極との間の導電経路が長くなると、蓄電デバイスの等価直列抵抗が大きくなるという問題がある。 As described above, there is a problem that when the conductive path between the power storage element and the external electrode provided in the storage container becomes longer, the equivalent series resistance of the power storage device increases.
　本発明は、上記課題を解決するものであり、蓄電素子と、収容容器に設けられている外部電極との間の導電経路を短くして等価直列抵抗を小さくした蓄電デバイスを提供することを目的とする。 An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a power storage device in which a conductive path between a power storage element and an external electrode provided in a storage container is shortened to reduce an equivalent series resistance. And
　本発明の蓄電デバイスは、
　蓄電素子と、
　前記蓄電素子を収容する収容容器と、
　前記蓄電素子と前記収容容器に設けられている外部電極とを電気的に接続する導電部と、
を備え、
　前記蓄電素子は、
　長さ方向および幅方向に沿って延びる第１の主面および第２の主面と、前記長さ方向および厚み方向に沿って延びる第１の側面および第２の側面と、前記幅方向および前記厚み方向に沿って延びる第１の端面および第２の端面と、を有し、
　第１の内部電極と第２の内部電極とを備え、前記第１の内部電極と前記第２の内部電極が前記厚み方向に交互に複数積層されており、
　前記第１の端面に設けられ、複数の前記第１の内部電極と接続された第１の端面電極と、前記第２の端面に設けられ、複数の前記第２の内部電極と接続された第２の端面電極とを備え、
　前記収容容器は、
　前記蓄電素子の前記第２の主面と対向する面である内側底面に設けられた第１の端子と、
　前記内側底面と反対側の面である外側底面に設けられ、前記第１の端子と電気的に接続されている第１の外部電極と、
　前記内側底面に設けられた第２の端子と、
　前記外側底面に設けられ、前記第２の端子と電気的に接続されている第２の外部電極と、
を備え、
　前記導電部は、
　前記第１の端面電極と前記第１の端子との間を電気的に接続する第１の導電性樹脂と、
　前記第２の端面電極と前記第２の端子との間を電気的に接続する第２の導電性樹脂と、
を備えることを特徴とする。 The power storage device of the present invention includes:
A storage element,
A housing container for housing the power storage element,
A conductive portion that electrically connects the power storage element and an external electrode provided in the storage container,
With
The electricity storage element,
A first main surface and a second main surface extending along the length direction and the width direction; a first side surface and a second side surface extending along the length direction and the thickness direction; A first end surface and a second end surface extending along the thickness direction;
A first internal electrode and a second internal electrode, wherein a plurality of the first internal electrodes and the second internal electrodes are alternately stacked in the thickness direction;
A first end face electrode provided on the first end face and connected to the plurality of first internal electrodes; a second end face provided on the second end face and connected to the plurality of second internal electrodes; 2 end face electrodes,
The storage container,
A first terminal provided on an inner bottom surface that is a surface facing the second main surface of the power storage element;
A first external electrode provided on an outer bottom surface opposite to the inner bottom surface and electrically connected to the first terminal;
A second terminal provided on the inner bottom surface;
A second external electrode provided on the outer bottom surface and electrically connected to the second terminal;
With
The conductive portion,
A first conductive resin that electrically connects between the first end face electrode and the first terminal;
A second conductive resin that electrically connects between the second end surface electrode and the second terminal;
It is characterized by having.
　前記第１の導電性樹脂および前記第２の導電性樹脂は、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを含有していてもよい。 The first conductive resin and the second conductive resin may contain a conductive filler containing at least one selected from the group consisting of copper and nickel.
　前記導電性フィラーは、その表面が金、銀、および、白金のいずれかで被覆されていてもよい。 表面 The surface of the conductive filler may be coated with any of gold, silver, and platinum.
　前記第１の導電性樹脂および前記第２の導電性樹脂は、銀を含む導電性フィラーを含有しており、
　前記第１の端面電極および前記第２の端面電極には、Ａｕ、Ｎｉ、Ｐｔ、Ｃｕ、Ｔｉ、Ｃｒ、Ｃｏ、Ｍｎ、および、Ｃからなる群より選択される少なくとも１種、または前記少なくとも１種を含む合金を含有する導電膜が形成されていてもよい。 The first conductive resin and the second conductive resin contain a conductive filler containing silver,
The first end face electrode and the second end face electrode each include at least one selected from the group consisting of Au, Ni, Pt, Cu, Ti, Cr, Co, Mn, and C; A conductive film containing an alloy containing a seed may be formed.
　前記蓄電素子の前記第１の端面および前記第２の端面のうち、前記第１の導電性樹脂および前記第２の導電性樹脂が設けられていない部分と、前記第１の主面、前記第１の側面、および前記第２の側面とが絶縁性樹脂によって覆われていてもよい。 A portion of the first end face and the second end face of the power storage element where the first conductive resin and the second conductive resin are not provided; a first main surface; The first side surface and the second side surface may be covered with an insulating resin.
　前記収容容器は、前記第１の端子と前記第１の外部電極とを接続する第１のビア導体と、前記第２の端子と前記第２の外部電極とを接続する第２のビア導体とをさらに備えており、
　前記厚み方向に見たときに、前記第１のビア導体は、その少なくとも一部が前記第１の端面電極と重なる位置に配置され、前記第２のビア導体は、その少なくとも一部が前記第２の端面電極と重なる位置に配置されていてもよい。 The container includes a first via conductor that connects the first terminal to the first external electrode, a second via conductor that connects the second terminal to the second external electrode, Is further provided,
When viewed in the thickness direction, the first via conductor is disposed at a position where at least a part thereof overlaps the first end face electrode, and at least a part of the second via conductor is the second terminal conductor. It may be arranged at a position overlapping the second end face electrode.
　前記第１の導電性樹脂は、前記第１の端面電極と、前記第１の端面電極と対向する前記収容容器の内側側面との間に挟まれており、前記第２の導電性樹脂は、前記第２の端面電極と、前記第２の端面電極と対向する前記収容容器の内側側面との間に挟まれていてもよい。 The first conductive resin is sandwiched between the first end surface electrode and an inner side surface of the storage container facing the first end surface electrode, and the second conductive resin is The second end face electrode may be sandwiched between the second end face electrode and an inner side face of the container facing the second end face electrode.
　前記収容容器は、一端に開口部を有する有底筒状の形状を有しており、
　前記収容容器の開口部を封止するための金属製の蓋をさらに備えていてもよい。 The storage container has a bottomed cylindrical shape having an opening at one end,
The storage container may further include a metal lid for sealing the opening.
　前記収容容器は、一端に開口部を有する有底筒状の形状を有しており、
　前記収容容器の前記開口部を封止するための金属製の蓋をさらに備え、
　前記蓄電素子の前記第１の主面を覆っている前記絶縁性樹脂は、前記第１の主面と前記金属製の蓋との間に挟まれていてもよい。 The storage container has a bottomed cylindrical shape having an opening at one end,
Further comprising a metal lid for sealing the opening of the storage container,
The insulating resin covering the first main surface of the power storage element may be sandwiched between the first main surface and the metal lid.
　本発明の蓄電デバイスでは、蓄電素子の第１の端面に、複数の第１の内部電極と接続された第１の端面電極が設けられ、第２の端面に、複数の第２の内部電極と接続された第２の端面電極が設けられている。また、収容容器の内側底面には第１の端子および第２の端子が設けられ、外側底面には、第１の端子と電気的に接続された第１の外部電極および第２の端子と電気的に接続された第２の外部電極が設けられている。そして、第１の端面電極と第１の端子との間を第１の導電性樹脂によって電気的に接続し、第２の端面電極と第２の端子との間を第２の導電性樹脂によって電気的に接続している。そのような構成により、第１の内部電極と第１の外部電極との間、および、第２の内部電極と第２の外部電極との間の導電経路を短くして等価直列抵抗を低減することができ、電気的特性を向上させることができる。 In the electric storage device of the present invention, the first end face of the electric storage element is provided with the first end face electrode connected to the plurality of first internal electrodes, and the second end face is provided with the plurality of second internal electrodes. A connected second end face electrode is provided. A first terminal and a second terminal are provided on an inner bottom surface of the container, and a first external electrode and a second terminal electrically connected to the first terminal are provided on the outer bottom surface. A second external electrode is provided which is electrically connected. Then, the first end face electrode and the first terminal are electrically connected by the first conductive resin, and the second end face electrode and the second terminal are electrically connected by the second conductive resin. Electrically connected. With such a configuration, the conductive paths between the first internal electrode and the first external electrode and between the second internal electrode and the second external electrode are shortened to reduce the equivalent series resistance. And electrical characteristics can be improved.
第１の実施形態における電気二重層キャパシタの構成を示す模式的斜視図である。It is a typical perspective view showing the composition of the electric double layer capacitor in a 1st embodiment. 図１に示す電気二重層キャパシタのＩＩ－ＩＩ線に沿った模式的断面図である。FIG. 2 is a schematic cross-sectional view of the electric double-layer capacitor shown in FIG. 1 along the line II-II. 導電性フィラーとして、銀フィラー、銅フィラーおよびニッケルフィラーをそれぞれ用いた場合の導電性樹脂とアルミニウムとの間の接触抵抗を示す図である。It is a figure which shows the contact resistance between conductive resin and aluminum at the time of using a silver filler, a copper filler, and a nickel filler as a conductive filler, respectively. 第２の実施形態における電気二重層キャパシタの構成を示す模式的断面図である。It is a typical sectional view showing the composition of the electric double layer capacitor in a 2nd embodiment. 第１の端面電極および第２の端面電極の表面に、金の薄膜を設けた場合および金の薄膜を設けない場合のそれぞれについて、銀フィラーを含む導電性樹脂との間の接触抵抗を示す図である。The figure which shows the contact resistance with the conductive resin containing a silver filler about the case where a gold | metal thin film is provided and the case where a gold | metal thin film is not provided on the surface of a 1st end surface electrode and a 2nd end surface electrode, respectively. It is. 第３の実施形態における電気二重層キャパシタの構成を示す模式的断面図である。It is a typical sectional view showing the composition of the electric double layer capacitor in a 3rd embodiment.
　以下に本発明の実施形態を示して、本発明の特徴とするところを具体的に説明する。以下の説明では、本発明の蓄電デバイスとして、電気二重層キャパシタを一例に挙げて説明する。ただし、蓄電デバイスが電気二重層キャパシタに限定されることはなく、積層セラミックコンデンサなどであってもよい。 (4) Embodiments of the present invention will be described below to specifically describe features of the present invention. In the following description, an electric double layer capacitor will be described as an example of the power storage device of the present invention. However, the power storage device is not limited to an electric double layer capacitor, and may be a multilayer ceramic capacitor or the like.
　＜第１の実施形態＞
　図１は、本発明の第１の実施形態における電気二重層キャパシタ１００の構成を示す模式的斜視図である。図２は、図１に示す電気二重層キャパシタ１００のＩＩ－ＩＩ線に沿った模式的断面図である。図１において、Ｌは長さ方向、Ｗは幅方向、Ｔは厚み方向（内部電極の積層方向）をそれぞれ示す。 <First embodiment>
FIG. 1 is a schematic perspective view showing the configuration of the electric double layer capacitor 100 according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the electric double layer capacitor 100 shown in FIG. 1 along the line II-II. In FIG. 1, L indicates the length direction, W indicates the width direction, and T indicates the thickness direction (the laminating direction of the internal electrodes).
　第１の実施形態における電気二重層キャパシタ１００は、電気二重層キャパシタ素子１０と、収容容器２０と、第１の導電性樹脂３０ａと、第２の導電性樹脂３０ｂと、蓋４０と、シームリング５０とを備える。 The electric double-layer capacitor 100 according to the first embodiment includes an electric double-layer capacitor element 10, a housing 20, a first conductive resin 30a, a second conductive resin 30b, a lid 40, and a seam ring. 50.
　蓄電素子である電気二重層キャパシタ素子１０は、略直方体形状であって、第１の主面１０ａおよび第２の主面１０ｂと、第１の側面および第２の側面と、第１の端面１０ｃおよび第２の端面１０ｄとを有する。第１の主面１０ａおよび第２の主面１０ｂは、長さ方向Ｌおよび幅方向Ｗに沿って延びている。第１の側面および第２の側面は、長さ方向Ｌおよび厚み方向Ｔに沿って延びている。第１の端面１０ｃおよび第２の端面１０ｄは、幅方向Ｗおよび厚み方向Ｔに沿って延びている。これらの第１の主面１０ａおよび第２の主面１０ｂ、第１の側面および第２の側面、第１の端面１０ｃおよび第２の端面１０ｄが、本発明の「表面」に相当する。 The electric double layer capacitor element 10 serving as a power storage element has a substantially rectangular parallelepiped shape, and includes a first main surface 10a and a second main surface 10b, a first side surface and a second side surface, and a first end surface 10c. And a second end face 10d. The first main surface 10a and the second main surface 10b extend along the length direction L and the width direction W. The first side surface and the second side surface extend along the length direction L and the thickness direction T. The first end face 10c and the second end face 10d extend along the width direction W and the thickness direction T. The first main surface 10a and the second main surface 10b, the first side surface and the second side surface, the first end surface 10c and the second end surface 10d correspond to the "surface" of the present invention.
　なお、本発明において、「直方体形状」には、角部や稜線部が面取りされた形状や丸められた形状も含まれる。角部は、電気二重層キャパシタ素子１０の３面が交わる部分であり、稜線部は、電気二重層キャパシタ素子１０の２面が交わる部分である。 In the present invention, the “cuboid shape” includes a shape in which a corner or a ridge is chamfered or a shape in which the corner or the ridge is rounded. A corner portion is a portion where three surfaces of the electric double layer capacitor element 10 intersect, and a ridge portion is a portion where two surfaces of the electric double layer capacitor element 10 intersect.
　電気二重層キャパシタ素子１０は、第１の内部電極１１と第２の内部電極１２とが電解質層１３を介して交互に複数積層された構造を有する。すなわち、複数の第１の内部電極１１と複数の第２の内部電極１２とが電解質層１３を介して交互に積層されている。第１の内部電極と第２の内部電極１２との間に電解質層１３が挟まれた構成を１層ととらえた場合、積層数は、３層以上であることが好ましい。 The electric double layer capacitor element 10 has a structure in which a plurality of first internal electrodes 11 and second internal electrodes 12 are alternately stacked via an electrolyte layer 13. That is, the plurality of first internal electrodes 11 and the plurality of second internal electrodes 12 are alternately stacked via the electrolyte layer 13. When the configuration in which the electrolyte layer 13 is interposed between the first internal electrode and the second internal electrode 12 is regarded as one layer, the number of layers is preferably three or more.
　複数の第１の内部電極１１は、電気二重層キャパシタ素子１０の第１の端面１０ｃに引き出されている一方、第１の側面、第２の側面および第２の端面１０ｄには引き出されていない。また、複数の第２の内部電極１２は、電気二重層キャパシタ素子１０の第１の端面１０ｃと対向する第２の端面１０ｄに引き出されている一方、第１の側面、第２の側面および第１の端面１０ｃには引き出されていない。 The plurality of first internal electrodes 11 are drawn out to the first end face 10c of the electric double layer capacitor element 10, but are not drawn out to the first side face, the second side face, and the second end face 10d. . Further, the plurality of second internal electrodes 12 are led out to a second end face 10d opposite to the first end face 10c of the electric double layer capacitor element 10, while the first side face, the second side face, and the second The first end face 10c is not drawn out.
　第１の端面１０ｃおよび第２の端面１０ｄは、第１の内部電極１１および第２の内部電極１２の主面と直交する面である。本実施形態において、第１の端面１０ｃおよび第２の端面１０ｄは、電気二重層キャパシタ素子１０の長さ方向Ｌに対向する面である。ただし、第１の端面１０ｃおよび第２の端面１０ｄは、電気二重層キャパシタ素子１０の幅方向Ｗに対向する面であってもよい。 The first end face 10c and the second end face 10d are surfaces orthogonal to the main surfaces of the first internal electrode 11 and the second internal electrode 12. In the present embodiment, the first end face 10c and the second end face 10d are faces opposed in the length direction L of the electric double layer capacitor element 10. However, the first end face 10c and the second end face 10d may be surfaces facing the width direction W of the electric double layer capacitor element 10.
　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 internal electrode 11 has a first current collector 11a and a first active material layer 11b.
　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である。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。 The first current collector 11a is, for example, a metal foil made of at least one metal such as aluminum and copper. In the present invention, “metal” includes an alloy.
　第１の活物質層１１ｂは、第１の集電体１１ａの両面に設けられている。ただし、厚み方向Ｔの最外層に第１の内部電極１１が存在する場合、その第１の内部電極１１の第１の集電体１１ａには、片面にのみ第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。第１の活物質層１１ｂは、分極性電極であって、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 first active material layer 11b is provided on both surfaces of the first current collector 11a. However, when the first internal electrode 11 exists in the outermost layer in the thickness direction T, the first current collector 11a of the first internal electrode 11 is provided with the first active material layer 11b only on one surface. Have been. The first active material layer 11b contains an active material. The first active material layer 11b is a polarizable electrode, and preferably contains, for example, a carbon material such as activated carbon as an active material.
　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 internal electrode 12 has a second current collector 12a and a second active material layer 12b.
　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等である。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。 The second current collector 12a is, for example, a metal foil made of at least one metal such as aluminum and copper. In the present invention, “metal” includes an alloy.
　第２の活物質層１２ｂは、第２の集電体１２ａの両面に設けられている。ただし、厚み方向Ｔの最外層に第２の内部電極１２が存在する場合、その第２の内部電極１２の第２の集電体１２ａには、片面にのみ第２の活物質層１２ｂが設けられている。第２の活物質層１２ｂは、活物質を含む。第２の活物質層１２ｂは、分極性電極であって、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 12b is provided on both surfaces of the second current collector 12a. However, when the second internal electrode 12 exists in the outermost layer in the thickness direction T, the second current collector 12a of the second internal electrode 12 is provided with the second active material layer 12b only on one surface. Have been. The second active material layer 12b contains an active material. The second active material layer 12b is a polarizable electrode, and preferably 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からなっていてもよいし、電解液が含浸したセパレータ等の多孔質体からなっていてもよい。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。 電解 An electrolyte layer 13 is provided between the first active material layer 11b of the first internal electrode 11 and the second active material layer 12b of the second internal electrode 12. The electrolyte layer 13 is a layer containing an electrolyte. The electrolyte layer 13 may be made of a gel electrolyte which is a gel electrolyte, or may be made of a porous body such as a separator impregnated with an electrolyte. Specific examples of the gel electrolyte include, for example, polymer polyethylene oxide containing an electrolyte.
　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かしたものを用いることができる。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 an ionic liquid such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or the like. A solution obtained by dissolving the ionic liquid in an organic solvent such as propylene carbonate or acetonitrile can be used. One of these electrolytes may be used alone, or a plurality of them may be mixed and used.
　本実施形態では、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１０ｃに露出している。また、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１０ｄ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、および電解質層１３は、第１の端面１０ｃおよび第２の端面１０ｄには露出していない。 In the present embodiment, of the first internal electrodes 11, only the first current collector 11a is exposed on the first end face 10c. Also, of the second internal electrodes 12, only the second current collector 12a is exposed on the second end face 10d. The first active material layer 11b of the first internal electrode 11, the second active material layer 12b of the second internal electrode 12, and the electrolyte layer 13 are exposed on the first end face 10c and the second end face 10d. I haven't.
　第１の活物質層１１ｂ、第２の活物質層１２ｂ、および電解質層１３と、第１の端面１０ｃ、第２の端面１０ｄ、第１の側面、および第２の側面のそれぞれとの間には、絶縁層１６が設けられている。絶縁層１６により、第１の活物質層１１ｂ、第２の活物質層１２ｂ、および電解質層１３が第１の端面１０ｃ、第２の端面１０ｄ、第１の側面、および第２の側面のそれぞれから隔離されている。 Between the first active material layer 11b, the second active material layer 12b, and the electrolyte layer 13, and each of the first end face 10c, the second end face 10d, the first side face, and the second side face Is provided with an insulating layer 16. Due to the insulating layer 16, the first active material layer 11b, the second active material layer 12b, and the electrolyte layer 13 are formed on the first end face 10c, the second end face 10d, the first side face, and the second side face, respectively. Is isolated from
　なお、絶縁層１６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、シリコン樹脂等からなる。 The insulating layer 16 is made of, for example, urethane resin, acrylic resin, epoxy resin, polyimide resin, silicon resin, or the like.
　電気二重層キャパシタ素子１０の第１の端面１０ｃには、第１の端面電極１４が設けられている。第１の端面電極１４は、複数の第１の内部電極１１と電気的に接続されている。また、第２の端面１０ｄには、第２の端面電極１５が設けられている。第２の端面電極１５は、複数の第２の内部電極１２と電気的に接続されている。すなわち、複数の第１の内部電極１１と複数の第２の内部電極１２は、並列に接続されている。これにより、電気二重層キャパシタ素子１０の高出力密度化を実現することができる。 The first end face electrode 14 is provided on the first end face 10 c of the electric double layer capacitor element 10. The first end face electrode 14 is electrically connected to the plurality of first internal electrodes 11. A second end face electrode 15 is provided on the second end face 10d. The second end face electrode 15 is electrically connected to the plurality of second internal electrodes 12. That is, the plurality of first internal electrodes 11 and the plurality of second internal electrodes 12 are connected in parallel. Thereby, high output density of the electric double layer capacitor element 10 can be realized.
　第１の端面電極１４および第２の端面電極１５は、例えばアルミニウムからなる。その場合、第１の端面電極１４および第２の端面電極１５は、アルミニウム溶射によって形成することができる。 The first end face electrode 14 and the second end face electrode 15 are made of, for example, aluminum. In that case, the first end face electrode 14 and the second end face electrode 15 can be formed by aluminum spraying.
　収容容器２０は、電気二重層キャパシタ素子１０を収容する凹部を備える。具体的には、収容容器２０は、一端に開口部を有し、開口部に対向する底面と、底面から略垂直に連なる側壁とを備える有底筒状の筐体である。収容容器２０は、絶縁性材料からなり、本実施形態では、例えばセラミック材料からなる。収容容器２０は、第１の側壁２０ｃ、第２の側壁２０ｄ、第３の側壁、および第４の側壁の４つの側壁を備える。なお、側壁の高さである側壁の厚み方向Ｔの距離は、電気二重層キャパシタ素子１０の厚み方向Ｔの距離よりも大きい。 The container 20 has a concave portion for accommodating the electric double layer capacitor element 10. Specifically, the storage container 20 is a bottomed cylindrical housing having an opening at one end, a bottom surface facing the opening, and a side wall extending substantially perpendicularly from the bottom surface. The storage container 20 is made of an insulating material, and in this embodiment, is made of, for example, a ceramic material. The storage container 20 includes four side walls: a first side wall 20c, a second side wall 20d, a third side wall, and a fourth side wall. The distance in the thickness direction T of the side wall, which is the height of the side wall, is larger than the distance in the thickness direction T of the electric double layer capacitor element 10.
　収容容器２０の底面であって、開口部側の面である内側底面２０ａには、第１の端子２１と第２の端子２２とが設けられている。内側底面２０ａは、電気二重層キャパシタ素子１０の第２の主面１０ｂと対向する面である。本実施形態では、第１の端子２１の一端は、収容容器２０の第１の側壁２０ｃと当接しており、第２の端子２２の一端は、収容容器２０の第２の側壁２０ｄと当接している。 第 A first terminal 21 and a second terminal 22 are provided on an inner bottom surface 20a which is a bottom surface of the container 20 and is a surface on the opening side. The inner bottom surface 20a is a surface facing the second main surface 10b of the electric double layer capacitor element 10. In the present embodiment, one end of the first terminal 21 is in contact with the first side wall 20c of the storage container 20, and one end of the second terminal 22 is in contact with the second side wall 20d of the storage container 20. ing.
　なお、第１の側壁２０ｃは、収容容器２０の４つの側壁のうち、電気二重層キャパシタ素子１０の第１の端面１０ｃに対向する側壁であり、第２の側壁２０ｄは、電気二重層キャパシタ素子１０の第２の端面１０ｄに対向する側壁である。また、第３の側壁は、電気二重層キャパシタ素子１０の第３の端面に対向する側壁であり、第４の側壁は、電気二重層キャパシタ素子１０の第４の端面に対向する側壁である。 The first side wall 20c is a side wall facing the first end face 10c of the electric double layer capacitor element 10 among the four side walls of the container 20, and the second side wall 20d is a side wall of the electric double layer capacitor element. 10 is a side wall facing the second end face 10d. Further, the third side wall is a side wall facing the third end face of the electric double layer capacitor element 10, and the fourth side wall is a side wall facing the fourth end face of the electric double layer capacitor element 10.
　収容容器２０の底面であって、内側底面とは反対側の面である外側底面２０ｂには、第１の外部電極２３と第２の外部電極２４が設けられている。第１の外部電極２３は、第１のビア導体２５を介して、第１の端子２１と電気的に接続されている。また、第２の外部電極２４は、第２のビア導体２６を介して、第２の端子２２と電気的に接続されている。 １A first external electrode 23 and a second external electrode 24 are provided on an outer bottom surface 20b which is a surface opposite to the inner bottom surface on the bottom surface of the housing container 20. The first external electrode 23 is electrically connected to the first terminal 21 via the first via conductor 25. Further, the second external electrode 24 is electrically connected to the second terminal 22 via the second via conductor 26.
　本実施形態では、第１のビア導体２５は、収容容器２０の底面の第１の側壁２０ｃ側において、幅方向Ｗに並んで３つ設けられている。また、第２のビア導体２６は、収容容器２０の底面の第２の側壁２０ｄ側において、幅方向Ｗに並んで３つ設けられている。ただし、第１のビア導体２５および第２のビア導体２６の数が３つに限定されることはない。 In the present embodiment, three first via conductors 25 are provided side by side in the width direction W on the first side wall 20 c side of the bottom surface of the storage container 20. Further, three second via conductors 26 are provided side by side in the width direction W on the second side wall 20 d side of the bottom surface of the storage container 20. However, the number of first via conductors 25 and second via conductors 26 is not limited to three.
　厚み方向Ｔに見たときに、第１のビア導体２５は、その少なくとも一部が第１の端面電極１４と重なる位置に配置され、第２のビア導体２６は、その少なくとも一部が第２の端面電極１５と重なる位置に配置されている。そのような配置により、第１の端面電極１４から、第１の端子２１、第１のビア導体２５を介して、第１の外部電極２３へと至る導電経路、および、第２の端面電極１５から、第２の端子２２、第２のビア導体２６を介して、第２の外部電極２４へと至る導電経路を短くすることができ、電気二重層キャパシタ１００の等価直列抵抗を小さくすることができる。 When viewed in the thickness direction T, the first via conductor 25 is disposed at a position where at least a part thereof overlaps the first end face electrode 14, and the second via conductor 26 has at least a part thereof Are arranged at positions overlapping with the end face electrodes 15. With such an arrangement, a conductive path from the first end face electrode 14 to the first external electrode 23 via the first terminal 21 and the first via conductor 25, and the second end face electrode 15 Therefore, the conductive path to the second external electrode 24 via the second terminal 22 and the second via conductor 26 can be shortened, and the equivalent series resistance of the electric double layer capacitor 100 can be reduced. it can.
　電気二重層キャパシタ素子１０と収容容器２０との間には、電気二重層キャパシタ素子１０と、第１の外部電極２３および第２の外部電極２４とを電気的に接続する導電部としての導電性樹脂が設けられている。より具体的には、少なくとも第１の端面電極１４と、第１の端面電極１４と対向する収容容器２０の第１の側壁２０ｃとの間の一部、および第１の端面電極１４と、第１の端面電極１４と対向する収容容器２０の内側底面２０ａとの間の一部には、第１の導電性樹脂３０ａが設けられている。また、少なくとも第２の端面電極１５と、第２の端面電極１５と対向する収容容器２０の第２の側壁２０ｄとの間の一部、および第２の端面電極１５と、第２の端面電極１５と対向する収容容器２０の内側底面２０ａとの間の一部には、第２の導電性樹脂３０ｂが設けられている。 Between the electric double layer capacitor element 10 and the container 20, a conductive part as a conductive part for electrically connecting the electric double layer capacitor element 10, the first external electrode 23 and the second external electrode 24 is provided. Resin is provided. More specifically, at least a portion between the first end face electrode 14 and the first side wall 20c of the storage container 20 facing the first end face electrode 14, and the first end face electrode 14, A first conductive resin 30a is provided in a part between the one end face electrode 14 and the inner bottom surface 20a of the storage container 20 facing the same. Further, at least a portion between the second end face electrode 15 and the second side wall 20 d of the storage container 20 facing the second end face electrode 15, the second end face electrode 15, and the second end face electrode A second conductive resin 30b is provided in a part between the inner container 15 and the inner bottom surface 20a of the opposite container 20.
　第１の端面電極１４側に設けられている第１の導電性樹脂３０ａは、第１の端面電極１４と第１の側壁２０ｃの電気二重層キャパシタ素子側の面である内側側面との間に挟まれている。また、第２の端面電極１５側に設けられている第２の導電性樹脂３０ｂは、第２の端面電極１５と第２の側壁２０ｄの電気二重層キャパシタ素子側の面である内側側面との間に挟まれている。このように、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂが設けられていることにより、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂを介して、電気二重層キャパシタ素子１０と収容容器２０との間の固着性を向上させることができる。すなわち、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂは、接着剤としての機能も有する。 The first conductive resin 30a provided on the first end face electrode 14 side is provided between the first end face electrode 14 and the inner side face of the first side wall 20c on the side of the electric double layer capacitor element. It is sandwiched. Further, the second conductive resin 30b provided on the second end face electrode 15 side is formed between the second end face electrode 15 and the inner side face which is the face of the second side wall 20d on the electric double layer capacitor element side. It is sandwiched between. As described above, since the first conductive resin 30a and the second conductive resin 30b are provided, the electric double layer capacitor is provided via the first conductive resin 30a and the second conductive resin 30b. The fixability between the element 10 and the container 20 can be improved. That is, the first conductive resin 30a and the second conductive resin 30b also have a function as an adhesive.
　導電部として機能する第１の導電性樹脂３０ａは、第１の端面電極１４と第１の端子２１との間を電気的に接続する。同じく導電部として機能する第２の導電性樹脂３０ｂは、第２の端面電極１５と第２の端子２２との間を電気的に接続する。 The first conductive resin 30a functioning as a conductive part electrically connects the first end face electrode 14 and the first terminal 21. The second conductive resin 30b, which also functions as a conductive portion, electrically connects between the second end face electrode 15 and the second terminal 22.
　すなわち、電気二重層キャパシタ素子１０の複数の第１の内部電極１１は、第１の端面電極１４、第１の導電性樹脂３０ａ、第１の端子２１、および、第１のビア導体２５を介して、第１の外部電極２３と電気的に接続されている。また、複数の第２の内部電極１２は、第２の端面電極１５、第２の導電性樹脂３０ｂ、第２の端子２２、および、第２のビア導体２６を介して、第２の外部電極２４と電気的に接続されている。 That is, the plurality of first internal electrodes 11 of the electric double layer capacitor element 10 are connected via the first end face electrode 14, the first conductive resin 30a, the first terminal 21, and the first via conductor 25. And is electrically connected to the first external electrode 23. Further, the plurality of second internal electrodes 12 are connected to the second external electrode via the second end face electrode 15, the second conductive resin 30b, the second terminal 22, and the second via conductor 26. 24 is electrically connected.
　第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂは、流動性のある導電性ペーストが硬化したものである。導電性ペーストとして、導電性フィラーを含有する樹脂ペーストを用いることができる。導電性フィラーとして、例えば、導電率が高く、化学的に安定している銀フィラーを用いることができる。また、樹脂ペーストとして、例えばエポキシ樹脂を用いることができる。 {Circle around (1)} The first conductive resin 30a and the second conductive resin 30b are obtained by hardening a fluid conductive paste. As the conductive paste, a resin paste containing a conductive filler can be used. As the conductive filler, for example, a silver filler having high conductivity and being chemically stable can be used. Further, for example, an epoxy resin can be used as the resin paste.
　ただし、導電性フィラーが銀フィラーに限定されることはなく、例えば、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを用いるようにしてもよい。第１の端面電極１４および第２の端面電極１５がアルミニウムからなる場合、以下の理由より、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂに含まれる導電性フィラーとして、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを用いることが好ましい。 However, the conductive filler is not limited to the silver filler, and for example, a conductive filler containing at least one selected from the group consisting of copper and nickel may be used. When the first end face electrode 14 and the second end face electrode 15 are made of aluminum, copper and nickel are used as conductive fillers contained in the first conductive resin 30a and the second conductive resin 30b for the following reason. It is preferable to use a conductive filler containing at least one selected from the group consisting of:
　図３は、導電性フィラーとして、銀フィラー、銅フィラーおよびニッケルフィラーをそれぞれ用いた場合の導電性樹脂とアルミニウムとの間の接触抵抗を示す図である。ここでは、接触抵抗を測定するために、銀フィラー、銅フィラーおよびニッケルフィラーをそれぞれ含む樹脂ペーストを用いて形成された導電性樹脂の試料を５個用意して、アルミニウムとの間の接触抵抗の平均値とバラツキを求めた。 FIG. 3 is a diagram showing the contact resistance between the conductive resin and aluminum when a silver filler, a copper filler, and a nickel filler are used as the conductive filler, respectively. Here, in order to measure the contact resistance, five conductive resin samples formed using a resin paste containing a silver filler, a copper filler, and a nickel filler, respectively, were prepared, and the contact resistance between aluminum and aluminum was measured. The average and variation were determined.
　図３に示すように、銅フィラーを含む導電性樹脂およびニッケルフィラーを含む導電性樹脂の接触抵抗は、銀フィラーを含む導電性樹脂の接触抵抗と比べて小さく、かつ、バラツキが小さい。 (3) As shown in FIG. 3, the contact resistance of the conductive resin containing the copper filler and the conductive resin containing the nickel filler is smaller than the contact resistance of the conductive resin containing the silver filler, and the variation is small.
　すなわち、銀は、アルミニウムとの接触抵抗が高く、また、接触抵抗のバラツキが大きい。一方、銅およびニッケルは、銀と比べてアルミニウムとの接触抵抗が低く、また、接触抵抗のバラツキが小さい。したがって、第１の端面電極１４および第２の端面電極１５がアルミニウムからなる場合、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂを形成するための樹脂ペーストに含まれる導電性フィラーとして、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを用いることが好ましい。第１の端面電極１４および第２の端面電極１５との接触抵抗が低減することにより、電気二重層キャパシタ１００の出力特性が向上する。また、接触抵抗のバラツキが低減することにより、電気二重層キャパシタ１００の品質安定性が向上する。また、銅およびニッケルは、銀と比べて安価であるため、コストを低減することができる。 That is, silver has a high contact resistance with aluminum and a large variation in contact resistance. On the other hand, copper and nickel have lower contact resistance with aluminum than silver, and have less variation in contact resistance. Therefore, when the first end face electrode 14 and the second end face electrode 15 are made of aluminum, as the conductive filler contained in the resin paste for forming the first conductive resin 30a and the second conductive resin 30b, It is preferred to use a conductive filler containing at least one selected from the group consisting of copper and nickel. The output characteristics of the electric double layer capacitor 100 are improved by reducing the contact resistance between the first end face electrode 14 and the second end face electrode 15. In addition, since the variation in the contact resistance is reduced, the quality stability of the electric double layer capacitor 100 is improved. Further, copper and nickel are inexpensive as compared with silver, so that the cost can be reduced.
　また、導電性フィラーとして、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを用いた場合に、導電性フィラーの表面を、金、銀、および、白金のいずれかで被覆するようにしてもよい。被覆は、導電性フィラーの表面全体に対して行われていてもよいし、一部に対して行われていてもよい。金、銀、および、白金は、電解液に対する耐性が高く、化学的に安定しているので、導電性フィラーの表面を金、銀、および、白金のいずれかで被覆すれば、より好ましい。 When a conductive filler containing at least one selected from the group consisting of copper and nickel is used as the conductive filler, the surface of the conductive filler is coated with gold, silver, or platinum. You may make it. The coating may be performed on the entire surface of the conductive filler, or may be performed on a part thereof. Since gold, silver, and platinum have high resistance to an electrolytic solution and are chemically stable, it is more preferable to coat the surface of the conductive filler with one of gold, silver, and platinum.
　ここで、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂの線膨張係数は、第１の端面電極１４および第２の端面電極１５の線膨張係数より小さく、かつ、収容容器２０の線膨張係数よりも大きい。したがって、第１の導電性樹脂３０ａが第１の端面電極１４と収容容器２０との間に設けられ、第２の導電性樹脂３０ｂが第２の端面電極１５と収容容器２０との間に設けられることにより、線膨張係数が段階的に変化し、実装時に熱が加わったときの変形を吸収することができる。 Here, the linear expansion coefficients of the first conductive resin 30a and the second conductive resin 30b are smaller than the linear expansion coefficients of the first end face electrode 14 and the second end face electrode 15, and It is larger than the coefficient of linear expansion. Therefore, the first conductive resin 30a is provided between the first end surface electrode 14 and the housing container 20, and the second conductive resin 30b is provided between the second end surface electrode 15 and the housing container 20. As a result, the coefficient of linear expansion changes stepwise, and it is possible to absorb deformation when heat is applied during mounting.
　蓋４０は、収容容器２０の上方の開口部を封止するために設けられている。蓋４０と収容容器２０との間にはシームリング５０が設けられており、蓋４０と収容容器２０との界面から水分等が侵入することを抑制することができる。本実施形態において、蓋４０は金属製である。蓋４０を金属製とすることにより、セラミック製とした場合と比べて、気密性を容易に得ることができる。 The lid 40 is provided to seal the opening above the storage container 20. A seam ring 50 is provided between the lid 40 and the storage container 20, and can prevent moisture and the like from entering the interface between the lid 40 and the storage container 20. In the present embodiment, the lid 40 is made of metal. When the lid 40 is made of metal, airtightness can be easily obtained as compared with the case where the lid 40 is made of ceramic.
　上述したように、本実施形態における電気二重層キャパシタ１００では、電気二重層キャパシタ素子１０の第１の端面１０ｃに、複数の第１の内部電極１１と電気的に接続された第１の端面電極１４が形成され、第２の端面１０ｄに、複数の第２の内部電極１２と電気的に接続された第２の端面電極１５が形成されている。また、収容容器２０の内側底面２０ａには、第１の端子２１と第２の端子２２が設けられ、外側底面２０ｂには、第１の端子２１と電気的に接続されている第１の外部電極２３、および、第２の端子２２と電気的に接続されている第２の外部電極２４が設けられている。そして、第１の端子２１と第１の端面電極１４とが第１の導電性樹脂３０ａを介して電気的に接続され、第２の端子２２と第２の端面電極１５とが第２の導電性樹脂３０ｂを介して電気的に接続されている。そのような構成により、複数の第１の内部電極１１と第１の外部電極２３との間、および、複数の第２の内部電極１２と第２の外部電極２４との間の導電経路を短くすることができ、電気二重層キャパシタ１００の等価直列抵抗を小さくすることができる。これにより、電気二重層キャパシタ１００の出力特性を向上させることができる。 As described above, in the electric double layer capacitor 100 of the present embodiment, the first end face 10 c of the electric double layer capacitor element 10 has the first end face electrode electrically connected to the plurality of first internal electrodes 11. The second end face electrode 15 electrically connected to the plurality of second internal electrodes 12 is formed on the second end face 10d. A first terminal 21 and a second terminal 22 are provided on the inner bottom surface 20a of the housing container 20, and a first external terminal electrically connected to the first terminal 21 is provided on the outer bottom surface 20b. An electrode 23 and a second external electrode 24 that is electrically connected to the second terminal 22 are provided. Then, the first terminal 21 and the first end face electrode 14 are electrically connected via the first conductive resin 30a, and the second terminal 22 and the second end face electrode 15 are connected to the second conductive face. It is electrically connected via the conductive resin 30b. With such a configuration, the conductive paths between the plurality of first internal electrodes 11 and the first external electrodes 23 and between the plurality of second internal electrodes 12 and the second external electrodes 24 are shortened. And the equivalent series resistance of the electric double layer capacitor 100 can be reduced. Thus, the output characteristics of the electric double layer capacitor 100 can be improved.
　また、第１の端面電極１４と第１の端子２１との間を第１の導電性樹脂３０ａによって接続し、第２の端面電極１５と第２の端子２２との間を第２の導電性樹脂３０ｂによって接続しているので、溶接または溶射によって形成される接続部によって接続する構成と比べて、電気二重層キャパシタ素子１０と収容容器２０との間の隙間を小さくすることができる。したがって、収容容器２０の容積に対して、電気二重層キャパシタ素子１０のサイズをできるだけ大きくすることができるので、電気二重層キャパシタ１００の高容量化および高出力化を実現することができる。 The first end face electrode 14 and the first terminal 21 are connected by a first conductive resin 30a, and the second end face electrode 15 and the second terminal 22 are connected by a second conductive material. Since the connection is made by the resin 30b, the gap between the electric double layer capacitor element 10 and the housing container 20 can be made smaller than in the case where the connection is made by a connection portion formed by welding or thermal spraying. Therefore, the size of the electric double layer capacitor element 10 can be made as large as possible with respect to the volume of the storage container 20, so that the capacity and output of the electric double layer capacitor 100 can be increased.
　＜第２の実施形態＞
　図４は、第２の実施形態における電気二重層キャパシタ１００Ａの構成を示す模式的断面図である。第２の実施形態における電気二重層キャパシタ１００Ａは、図１に示す第１の実施形態における電気二重層キャパシタ１００に対して、導電膜６０をさらに備える。また、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂは、銀フィラーを含有する樹脂ペーストが硬化したものとして説明する。 <Second embodiment>
FIG. 4 is a schematic cross-sectional view illustrating a configuration of an electric double layer capacitor 100A according to the second embodiment. The electric double layer capacitor 100A according to the second embodiment is different from the electric double layer capacitor 100 according to the first embodiment shown in FIG. The first conductive resin 30a and the second conductive resin 30b will be described as those obtained by curing a resin paste containing a silver filler.
　導電膜６０は、収容容器２０の第１の側壁２０ｃの内側側面と対向する、第１の端面電極１４の表面、および、収容容器２０の第２の側壁２０ｄの内側側面と対向する、第２の端面電極１５の表面に設けられている。導電膜６０は、厚みが例えば１００ｎｍ以上３００ｎｍ以下の薄膜であり、Ａｕ、Ｎｉ、Ｐｔ、Ｃｕ、Ｔｉ、Ｃｒ、Ｃｏ、Ｍｎ、および、Ｃからなる群より選択される少なくとも１種または上記少なくとも１種を含む合金を含有する。 The conductive film 60 is opposed to the inner side surface of the first side wall 20 c of the housing container 20, and faces the surface of the first end face electrode 14 and the inner side surface of the second side wall 20 d of the housing container 20. Are provided on the surface of the end surface electrode 15. The conductive film 60 is a thin film having a thickness of, for example, 100 nm or more and 300 nm or less, and is at least one selected from the group consisting of Au, Ni, Pt, Cu, Ti, Cr, Co, Mn, and C, or at least one of Contains an alloy containing seeds.
　導電膜６０は、例えばスパッタリングによって形成することができる。また、導電膜６０を形成する際に、第１の端面電極１４および第２の端面電極１５の表面に逆スパッタリングを行ってから、導電膜６０を形成するようにしてもよい。第１の端面電極１４および第２の端面電極１５の表面に逆スパッタリングを行うことにより、第１の端面電極１４および第２の端面電極１５の酸化膜を除去することができ、第１の端面電極１４および第２の端面電極１５と導電膜６０との密着性を向上させることができる。 The conductive film 60 can be formed by, for example, sputtering. When forming the conductive film 60, the conductive film 60 may be formed after performing reverse sputtering on the surfaces of the first end face electrode 14 and the second end face electrode 15. By performing reverse sputtering on the surfaces of the first end face electrode 14 and the second end face electrode 15, the oxide film of the first end face electrode 14 and the second end face electrode 15 can be removed, and the first end face can be removed. The adhesion between the electrode 14 and the second end face electrode 15 and the conductive film 60 can be improved.
　図５は、アルミニウムの表面にＡｕ（金）の薄膜を設けた場合の薄膜と、銀フィラーを含む樹脂ペーストを用いて形成された導電性樹脂との間の接触抵抗、および、アルミニウムの表面にＡｕの薄膜を設けない場合のアルミニウムと、銀フィラーを含む樹脂ペーストを用いて形成された導電性樹脂との間の接触抵抗を示す図である。ここでも、試料を５個用意して、接触抵抗の平均値とバラツキを求めた。 FIG. 5 shows the contact resistance between a thin film in the case where a thin film of Au (gold) is provided on the surface of aluminum and a conductive resin formed using a resin paste containing a silver filler, and the contact resistance between the thin film and the surface of aluminum. It is a figure which shows the contact resistance between the aluminum which does not provide a thin film of Au, and the conductive resin formed using the resin paste containing a silver filler. Here, five samples were prepared, and the average value and the variation of the contact resistance were determined.
　上述したように、銀は、アルミニウムとの接触抵抗が高く、また、接触抵抗のバラツキが大きい。したがって、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂを形成するための樹脂ペーストに含まれる導電性フィラーとして銀フィラーを用い、第１の端面電極１４および第２の端面電極１５がアルミニウムからなる場合、図５に示すように、第１の導電性樹脂３０ａと第１の端面電極１４との間、および第２の導電性樹脂３０ｂと第２の端面電極１５との間の接触抵抗が高くなる。 銀 As described above, silver has a high contact resistance with aluminum and a large variation in the contact resistance. Therefore, a silver filler is used as a conductive filler included in a resin paste for forming the first conductive resin 30a and the second conductive resin 30b, and the first end face electrode 14 and the second end face electrode 15 are used. When made of aluminum, as shown in FIG. 5, contact between the first conductive resin 30a and the first end face electrode 14 and between the second conductive resin 30b and the second end face electrode 15 are made. Resistance increases.
　一方、アルミニウムの表面にＡｕの薄膜を設けた場合、Ａｕの薄膜と、銀フィラーを含む樹脂ペーストを用いて形成された第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂとの間の接触抵抗は低く、バラツキも小さい。したがって、アルミニウムからなる第１の端面電極１４の表面および第２の端面電極１５の表面にＡｕを含む導電膜６０を形成することにより、接触抵抗を低減し、かつ、接触抵抗のバラツキを小さくすることができる。Ａｕの薄膜の代わりに、Ｎｉ、Ｐｔ、Ｃｕ、Ｔｉ、Ｃｒ、Ｃｏ、Ｍｎ、Ｃ、またはそれらを含む合金からなる薄膜を形成した場合も同様である。 On the other hand, when an Au thin film is provided on the surface of aluminum, the Au thin film and the first conductive resin 30a and the second conductive resin 30b formed by using a resin paste containing a silver filler are used. The contact resistance is low and the variation is small. Therefore, by forming the conductive film 60 containing Au on the surface of the first end face electrode 14 and the surface of the second end face electrode 15 made of aluminum, the contact resistance is reduced and the variation in the contact resistance is reduced. be able to. The same applies to the case where a thin film made of Ni, Pt, Cu, Ti, Cr, Co, Mn, C, or an alloy containing them is formed instead of the Au thin film.
　すなわち、第２の実施形態における電気二重層キャパシタ１００Ａによれば、第１の端面電極１４の表面および第２の端面電極１５の表面に、Ａｕ、Ｎｉ、Ｐｔ、Ｃｕ、Ｔｉ、Ｃｒ、Ｃｏ、Ｍｎ、および、Ｃからなる群より選択される少なくとも１種または上記少なくとも１種を含む合金を含有する導電膜６０が形成されているので、上記導電膜６０が形成されていない構成と比べて、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂとの接触抵抗を低減し、かつ、接触抵抗のバラツキを低減することができる。これにより、電気二重層キャパシタ１００Ａの出力特性をさらに向上させるとともに、電気二重層キャパシタ１００Ａの品質安定性をさらに向上させることができる。 That is, according to the electric double layer capacitor 100A in the second embodiment, Au, Ni, Pt, Cu, Ti, Cr, Co, and the like are formed on the surface of the first end surface electrode 14 and the surface of the second end surface electrode 15. Since the conductive film 60 containing at least one selected from the group consisting of Mn and C or an alloy containing the at least one type is formed, compared to a configuration in which the conductive film 60 is not formed, The contact resistance between the first conductive resin 30a and the second conductive resin 30b can be reduced, and the variation in the contact resistance can be reduced. Thus, the output characteristics of the electric double layer capacitor 100A can be further improved, and the quality stability of the electric double layer capacitor 100A can be further improved.
　＜第３の実施形態＞
　図６は、第３の実施形態における電気二重層キャパシタ１００Ｂの構成を示す模式的断面図である。第３の実施形態における電気二重層キャパシタ１００Ｂは、電気二重層キャパシタ素子１０の第１の端面１０ｃおよび第２の端面１０ｄのうち、第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂが設けられていない部分と、第１の主面１０ａ、第１の側面、および第２の側面が絶縁性樹脂７０によって覆われている点で、第１の実施形態における電気二重層キャパシタ１００と異なる。 <Third embodiment>
FIG. 6 is a schematic cross-sectional view illustrating a configuration of an electric double layer capacitor 100B according to the third embodiment. In the electric double layer capacitor 100B according to the third embodiment, the first conductive resin 30a and the second conductive resin 30b of the first end face 10c and the second end face 10d of the electric double layer capacitor element 10 are different from each other. It differs from the electric double layer capacitor 100 in the first embodiment in that the portion not provided and the first main surface 10a, the first side surface, and the second side surface are covered with the insulating resin 70. .
　すなわち、第１の実施形態における電気二重層キャパシタ１００では、電気二重層キャパシタ素子１０と収容容器２０との間、および、電気二重層キャパシタ素子１０と蓋４０との間に空隙が存在しているが、第３の実施形態における電気二重層キャパシタ１００Ｂでは、上記空隙を埋めるように、絶縁性樹脂７０が設けられている。換言すると、絶縁性樹脂７０は、電気二重層キャパシタ素子１０と収容容器２０との間、および、電気二重層キャパシタ素子１０と蓋４０との間に挟まれる態様で設けられている。 That is, in the electric double layer capacitor 100 according to the first embodiment, a gap exists between the electric double layer capacitor element 10 and the housing 20 and between the electric double layer capacitor element 10 and the lid 40. However, in the electric double layer capacitor 100 </ b> B according to the third embodiment, the insulating resin 70 is provided so as to fill the gap. In other words, the insulating resin 70 is provided between the electric double layer capacitor element 10 and the housing 20 and between the electric double layer capacitor element 10 and the lid 40.
　絶縁性樹脂７０は、以下のような方法により形成することができる。すなわち、収容容器２０内に電気二重層キャパシタ素子１０を収容した後、電気二重層キャパシタ素子１０を覆うように、絶縁性の液状樹脂を流し込む。液状樹脂として、例えば、エポキシ樹脂やシリコン樹脂を用いることができる。流し込まれた液状樹脂は、収容容器２０と電気二重層キャパシタ素子１０との間の空隙に入り込む。また、液状樹脂で、電気二重層キャパシタ素子１０の上面を覆うようにする。その後、加熱することによって、液状樹脂を硬化させる。これにより、絶縁性樹脂７０が形成される。なお、加熱をせずに、所定の時間放置することによって、液状樹脂を硬化させるようにしてもよい。 The insulating resin 70 can be formed by the following method. That is, after the electric double layer capacitor element 10 is accommodated in the container 20, an insulating liquid resin is poured so as to cover the electric double layer capacitor element 10. As the liquid resin, for example, an epoxy resin or a silicone resin can be used. The poured liquid resin enters a gap between the storage container 20 and the electric double layer capacitor element 10. Further, the upper surface of the electric double layer capacitor element 10 is covered with a liquid resin. Thereafter, the liquid resin is cured by heating. Thus, the insulating resin 70 is formed. The liquid resin may be cured by leaving it for a predetermined time without heating.
　第３の実施形態における電気二重層キャパシタ１００Ｂによれば、電気二重層キャパシタ素子１０が絶縁性樹脂７０で覆われているので、何らかの理由によって、電気二重層キャパシタ素子１０から電解液が漏れ出た場合でも、電解液が第１の導電性樹脂３０ａおよび第２の導電性樹脂３０ｂや、収容容器２０の第１の端子２１および第２の端子２２に付着することを抑制することができる。これにより、電解液が導電性樹脂３０や第１の端子２１および第２の端子２２に付着することによる腐食を抑制することができ、電気二重層キャパシタ１００Ｂの信頼性を向上させることができる。 According to the electric double layer capacitor 100B of the third embodiment, since the electric double layer capacitor element 10 is covered with the insulating resin 70, the electrolyte leaked from the electric double layer capacitor element 10 for some reason. Even in this case, it is possible to suppress the electrolytic solution from adhering to the first conductive resin 30a and the second conductive resin 30b, and to the first terminal 21 and the second terminal 22 of the container 20. Thereby, corrosion due to the electrolytic solution adhering to the conductive resin 30 and the first terminal 21 and the second terminal 22 can be suppressed, and the reliability of the electric double layer capacitor 100B can be improved.
　また、絶縁性樹脂７０によって、電気二重層キャパシタ素子１０と収容容器２０とをより強固に固定することができるので、電気二重層キャパシタ１００Ｂに衝撃が加わったときに、電気二重層キャパシタ素子１０が収容容器２０から外れることによる断線を抑制することができる。 Further, since the electric double layer capacitor element 10 and the storage container 20 can be more firmly fixed by the insulating resin 70, when the electric double layer capacitor 100B is shocked, the electric double layer capacitor element 10 Disconnection due to detachment from the storage container 20 can be suppressed.
　また、電気二重層キャパシタ素子１０と金属製の蓋４０との間、より詳しくは、電気二重層キャパシタ素子１０の第１の主面１０ａと金属製の蓋４０との間に挟まれる形で、絶縁性樹脂７０が存在するので、電気二重層キャパシタ素子１０と蓋４０との間、例えば第１の端面電極１４と蓋４０との間や、第２の端面電極１５と蓋４０との間がショートすることを抑制することができる。 Further, between the electric double layer capacitor element 10 and the metal lid 40, more specifically, between the first main surface 10 a of the electric double layer capacitor element 10 and the metal lid 40, Because of the presence of the insulating resin 70, the gap between the electric double layer capacitor element 10 and the lid 40, for example, between the first end face electrode 14 and the lid 40, or between the second end face electrode 15 and the lid 40 is formed. Shorting can be suppressed.
　本発明は、上記実施形態に限定されるものではなく、本発明の範囲内において、種々の応用、変形を加えることが可能である。例えば、上述した各実施形態の特徴は、適宜組み合わせることができる。 The present invention is not limited to the above embodiment, and various applications and modifications can be made within the scope of the present invention. For example, the features of the embodiments described above can be combined as appropriate.
　電気二重層キャパシタ素子１０は、第１の内部電極１１と第２の内部電極１２が交互に複数積層された構造を有していれば、上述した構成に限定されることはない。 The electric double layer capacitor element 10 is not limited to the above-described configuration as long as the electric double layer capacitor element 10 has a structure in which a plurality of first internal electrodes 11 and second internal electrodes 12 are alternately stacked.
１０　　電気二重層キャパシタ素子
１１　　第１の内部電極
１２　　第２の内部電極
１３　　電解質層
１４　　第１の端面電極
１５　　第２の端面電極
１６　　絶縁層
２０　　収容容器
２１　　第１の端子
２２　　第２の端子
２３　　第１の外部電極
２４　　第２の外部電極
２５　　第１のビア導体
２６　　第２のビア導体
３０ａ　第１の導電性樹脂
３０ｂ　第２の導電性樹脂
４０　　蓋
５０　　シームリング
６０　　導電膜
７０　　絶縁性樹脂
１００、１００Ａ、１００Ｂ　電気二重層キャパシタ Reference Signs List 10 electric double layer capacitor element 11 first internal electrode 12 second internal electrode 13 electrolyte layer 14 first end face electrode 15 second end face electrode 16 insulating layer 20 container 21 first terminal 22 second terminal 23 First external electrode 24 Second external electrode 25 First via conductor 26 Second via conductor 30a First conductive resin 30b Second conductive resin 40 Cover 50 Seam ring 60 Conductive film 70 Insulating resin 100 , 100A, 100B Electric double layer capacitor

Claims (9)

  1. 　蓄電素子と、
    　前記蓄電素子を収容する収容容器と、
    　前記蓄電素子と前記収容容器に設けられている外部電極とを電気的に接続する導電部と、
    を備え、
    　前記蓄電素子は、
    　長さ方向および幅方向に沿って延びる第１の主面および第２の主面と、前記長さ方向および厚み方向に沿って延びる第１の側面および第２の側面と、前記幅方向および前記厚み方向に沿って延びる第１の端面および第２の端面と、を有し、
    　第１の内部電極と第２の内部電極とを備え、前記第１の内部電極と前記第２の内部電極が前記厚み方向に交互に複数積層されており、
    　前記第１の端面に設けられ、複数の前記第１の内部電極と接続された第１の端面電極と、前記第２の端面に設けられ、複数の前記第２の内部電極と接続された第２の端面電極とを備え、
    　前記収容容器は、
    　前記蓄電素子と対向する面である内側底面に設けられた第１の端子と、
    　前記内側底面と反対側の面である外側底面に設けられ、前記第１の端子と電気的に接続されている第１の外部電極と、
    　前記内側底面に設けられた第２の端子と、
    　前記外側底面に設けられ、前記第２の端子と電気的に接続されている第２の外部電極と、
    を備え、
    　前記導電部は、
    　前記第１の端面電極と前記第１の端子との間を電気的に接続する第１の導電性樹脂と、
    　前記第２の端面電極と前記第２の端子との間を電気的に接続する第２の導電性樹脂と、
    を備えることを特徴とする蓄電デバイス。     A storage element,
    A housing container for housing the power storage element,
    A conductive portion that electrically connects the power storage element and an external electrode provided in the storage container,
    With
    The electricity storage element,
    A first main surface and a second main surface extending along the length direction and the width direction; a first side surface and a second side surface extending along the length direction and the thickness direction; A first end surface and a second end surface extending along the thickness direction;
    A first internal electrode and a second internal electrode, wherein a plurality of the first internal electrodes and the second internal electrodes are alternately stacked in the thickness direction;
    A first end face electrode provided on the first end face and connected to the plurality of first internal electrodes; a second end face provided on the second end face and connected to the plurality of second internal electrodes; 2 end face electrodes,
    The storage container,
    A first terminal provided on an inner bottom surface that is a surface facing the power storage element;
    A first external electrode provided on an outer bottom surface opposite to the inner bottom surface and electrically connected to the first terminal;
    A second terminal provided on the inner bottom surface;
    A second external electrode provided on the outer bottom surface and electrically connected to the second terminal;
    With
    The conductive portion,
    A first conductive resin that electrically connects between the first end face electrode and the first terminal;
    A second conductive resin that electrically connects between the second end surface electrode and the second terminal;
    A power storage device comprising:
  2. 　前記第１の導電性樹脂および前記第２の導電性樹脂は、銅およびニッケルからなる群より選択される少なくとも１種を含む導電性フィラーを含有することを特徴とする請求項１に記載の蓄電デバイス。 The power storage device according to claim 1, wherein the first conductive resin and the second conductive resin contain a conductive filler containing at least one selected from the group consisting of copper and nickel. device.
  3. 　前記導電性フィラーは、その表面が金、銀、および、白金のいずれかで被覆されていることを特徴とする請求項２に記載の蓄電デバイス。 The power storage device according to claim 2, wherein the surface of the conductive filler is coated with any of gold, silver, and platinum.
  4. 　前記第１の導電性樹脂および前記第２の導電性樹脂は、銀を含む導電性フィラーを含有しており、
    　前記第１の端面電極および前記第２の端面電極には、Ａｕ、Ｎｉ、Ｐｔ、Ｃｕ、Ｔｉ、Ｃｒ、Ｃｏ、Ｍｎ、および、Ｃからなる群より選択される少なくとも１種、または前記少なくとも１種を含む合金を含有する導電膜が形成されていることを特徴とする請求項１に記載の蓄電デバイス。     The first conductive resin and the second conductive resin contain a conductive filler containing silver,
    The first end face electrode and the second end face electrode each include at least one selected from the group consisting of Au, Ni, Pt, Cu, Ti, Cr, Co, Mn, and C; The power storage device according to claim 1, wherein a conductive film containing an alloy containing a seed is formed.
  5. 　前記蓄電素子の前記第１の端面および前記第２の端面のうち、前記第１の導電性樹脂および前記第２の導電性樹脂が設けられていない部分と、前記第１の主面、前記第１の側面、および前記第２の側面とが絶縁性樹脂によって覆われていることを特徴とする請求項１～４のいずれかに記載の蓄電デバイス。 A portion of the first end face and the second end face of the power storage element where the first conductive resin and the second conductive resin are not provided; a first main surface; The power storage device according to claim 1, wherein the first side surface and the second side surface are covered with an insulating resin.
  6. 　前記収容容器は、前記第１の端子と前記第１の外部電極とを接続する第１のビア導体と、前記第２の端子と前記第２の外部電極とを接続する第２のビア導体とをさらに備えており、
    　前記厚み方向に見たときに、前記第１のビア導体は、その少なくとも一部が前記第１の端面電極と重なる位置に配置され、前記第２のビア導体は、その少なくとも一部が前記第２の端面電極と重なる位置に配置されていることを特徴とする請求項１～５のいずれかに記載の蓄電デバイス。     The container includes a first via conductor that connects the first terminal to the first external electrode, a second via conductor that connects the second terminal to the second external electrode, Is further provided,
    When viewed in the thickness direction, the first via conductor is disposed at a position where at least a part thereof overlaps the first end face electrode, and at least a part of the second via conductor is the second terminal conductor. The power storage device according to any one of claims 1 to 5, wherein the power storage device is disposed at a position overlapping the second end face electrode.
  7. 　前記第１の導電性樹脂は、前記第１の端面電極と、前記第１の端面電極と対向する前記収容容器の内側側面との間に挟まれており、前記第２の導電性樹脂は、前記第２の端面電極と、前記第２の端面電極と対向する前記収容容器の内側側面との間に挟まれていることを特徴とする請求項１～６のいずれかに記載の蓄電デバイス。 The first conductive resin is sandwiched between the first end surface electrode and an inner side surface of the storage container facing the first end surface electrode, and the second conductive resin is The power storage device according to any one of claims 1 to 6, wherein the power storage device is sandwiched between the second end surface electrode and an inner side surface of the storage container facing the second end surface electrode.
  8. 　前記収容容器は、一端に開口部を有する有底筒状の形状を有しており、
    　前記収容容器の前記開口部を封止するための金属製の蓋をさらに備えることを特徴とする請求項１～７のいずれかに記載の蓄電デバイス。     The storage container has a bottomed cylindrical shape having an opening at one end,
    The power storage device according to any one of claims 1 to 7, further comprising a metal lid for sealing the opening of the storage container.
  9. 　前記収容容器は、一端に開口部を有する有底筒状の形状を有しており、
    　前記収容容器の前記開口部を封止するための金属製の蓋をさらに備え、
    　前記蓄電素子の前記第１の主面を覆っている前記絶縁性樹脂は、前記第１の主面と前記金属製の蓋との間に挟まれていることを特徴とする請求項５に記載の蓄電デバイス。     The storage container has a bottomed cylindrical shape having an opening at one end,
    Further comprising a metal lid for sealing the opening of the storage container,
    The insulating resin covering the first main surface of the power storage element is sandwiched between the first main surface and the metal lid. Power storage device.
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