WO2020022022A1 - Dispositif de stockage d'électricité - Google Patents

Dispositif de stockage d'électricité 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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WIPO (PCT)
Prior art keywords
electrode
face
power storage
terminal
conductive
Prior art date
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PCT/JP2019/026665
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English (en)
Japanese (ja)
Inventor
野田知宏
神頭将之
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株式会社村田製作所
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Publication of WO2020022022A1 publication Critical patent/WO2020022022A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—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

La présente invention concerne un dispositif de stockage d'électricité (un condensateur électrique à double couche (100)) est pourvu d'un élément de stockage d'électricité (un élément de condensateur électrique à double couche (10)), d'un récipient (20) et d'une partie conductrice. L'élément de stockage d'électricité est pourvu : des premières électrodes internes (11) et des secondes électrodes internes (12) ; d'une première électrode de face d'extrémité (14) qui est disposée sur une première face d'extrémité et est électriquement reliée à la pluralité des premières électrodes internes (11) ; et d'une seconde électrode de face d'extrémité (15) qui est disposée sur une seconde face d'extrémité et est électriquement reliée à la pluralité de secondes électrodes internes (12). Le récipient (20) est pourvu : d'une première borne (21) et d'une seconde borne (22), qui sont disposées sur la surface inférieure interne ; et d'une première électrode externe (23) et d'une seconde électrode externe (24), qui sont disposés sur la surface inférieure externe, et qui sont électriquement reliés à la première borne et à la seconde borne, respectivement. La partie conductrice est pourvue : d'une première résine conductrice (30a) qui relie électriquement la première électrode de face d'extrémité et la première borne l'une à l'autre ; et d'une seconde résine conductrice (30b) qui relie électriquement la seconde électrode de face d'extrémité et la seconde borne l'une à l'autre.
PCT/JP2019/026665 2018-07-26 2019-07-04 Dispositif de stockage d'électricité WO2020022022A1 (fr)

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JP2018-140137 2018-07-26

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WO2022030424A1 (fr) * 2020-08-07 2022-02-10 京セラ株式会社 Bac de batterie et module de batterie

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JP2004179090A (ja) * 2002-11-28 2004-06-24 Kyocera Corp 積層型電池
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JP2009093968A (ja) * 2007-10-10 2009-04-30 Seiko Epson Corp 全固体リチウム二次電池
JP2012222345A (ja) * 2011-04-07 2012-11-12 Avx Corp 固体電解コンデンサアセンブリのためのハウジング構成
WO2013001908A1 (fr) * 2011-06-28 2013-01-03 株式会社村田製作所 Élément de dispositif de stockage de courant et dispositif de stockage de courant
WO2013002119A1 (fr) * 2011-06-28 2013-01-03 株式会社 村田製作所 Dispositif de stockage, et procédé de fabrication de celui-ci
JP2013030750A (ja) * 2011-06-24 2013-02-07 Seiko Instruments Inc 電気化学セル及びその製造方法
JP2016173915A (ja) * 2015-03-17 2016-09-29 古河機械金属株式会社 バイポーラ型リチウムイオン電池およびバイポーラ型リチウムイオン電池の製造方法
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Publication number Priority date Publication date Assignee Title
JPH0223623A (ja) * 1988-07-12 1990-01-25 Sharp Corp 電極の形成方法
JPH08236796A (ja) * 1994-11-04 1996-09-13 Canon Inc 集電電極並びに該集電電極を用いた光起電力素子及びその製造方法
JP2004179090A (ja) * 2002-11-28 2004-06-24 Kyocera Corp 積層型電池
JP2004200094A (ja) * 2002-12-20 2004-07-15 Yazaki Corp 端子と電線との接続方法
JP2009093968A (ja) * 2007-10-10 2009-04-30 Seiko Epson Corp 全固体リチウム二次電池
JP2012222345A (ja) * 2011-04-07 2012-11-12 Avx Corp 固体電解コンデンサアセンブリのためのハウジング構成
JP2013030750A (ja) * 2011-06-24 2013-02-07 Seiko Instruments Inc 電気化学セル及びその製造方法
WO2013001908A1 (fr) * 2011-06-28 2013-01-03 株式会社村田製作所 Élément de dispositif de stockage de courant et dispositif de stockage de courant
WO2013002119A1 (fr) * 2011-06-28 2013-01-03 株式会社 村田製作所 Dispositif de stockage, et procédé de fabrication de celui-ci
JP2016173915A (ja) * 2015-03-17 2016-09-29 古河機械金属株式会社 バイポーラ型リチウムイオン電池およびバイポーラ型リチウムイオン電池の製造方法
JP2017010627A (ja) * 2015-06-17 2017-01-12 セイコーインスツル株式会社 電気化学セル

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Publication number Priority date Publication date Assignee Title
WO2022030424A1 (fr) * 2020-08-07 2022-02-10 京セラ株式会社 Bac de batterie et module de batterie

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