# US 2018/0025852 A1 · Power storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0025852 A1 - Document ID: US20180025852A1 - Status: Published application - Kind: A1 - Application number: 15/722,354 - Filed: 2017-10-02 - Published: 2018-01-25 - Earliest claimed: 2015-04-14 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Norihisa Aoki; Yasutake Fukuda; Hiroshi Kunimatsu; Yasuhiko Ueda; Kenji Kimura - Web page: https://patentgrep.com/patent/US20180025852A1 ## CPC - H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features - H01G 4/30: Stacked capacitors (H01G4/33 takes precedence) - H01G 11/10: Multiple hybrid or EDL capacitors, e.g. arrays or modules (housings, cases, encapsulations or mountings thereof H01G11/78) - H01G 11/12: Stacked hybrid or EDL capacitors - H01G 11/72: specially adapted for integration in multiple or stacked hybrid or EDL capacitors - H01G 11/76: specially adapted for integration in multiple or stacked hybrid or EDL capacitors - H01G 11/80: Gaskets; Sealings - H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives - H01G 11/78: Cases; Housings; Encapsulations; Mountings - H01G 11/82: Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations - Y02E 60/10: Energy storage using batteries - Y02E 60/13: Energy storage using capacitors - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract An electrical double layer capacitor having an electrolyte-containing layer between a first polarizable electrode layer and a second polarizable electrode layer. An insulating adhesive portion adheres to a first current collector and a second current collector and extends around the first and second polarizable electrode layers and the electrolyte-containing layer. A thickness of the insulating adhesive portion is larger than a sum of thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer. ## Claims ### Claim 1 A power storage device comprising: a device body having first and second principal surfaces extending along a length direction and a width direction, first and second side surfaces extending along the length direction and a thickness direction, and first and second end surfaces extending along the width direction and the thickness direction, the device body comprising: a first internal electrode which has a first current collector and a first polarizable electrode layer on at least one surface of the first current collector and the first current collector extends to the first end surface, a second internal electrode which has a second current collector and a second polarizable electrode layer on at least one surface of the second current collector and the second current collector extends to the second end surface, an electrolyte-containing layer between the first polarizable electrode layer and the second polarizable electrode layer, and an insulating adhesive portion adhered to the first current collector and the second current collector and extending around the first and second polarizable electrode layers and the electrolyte-containing layer, wherein a thickness of the insulating adhesive portion is larger than a sum of thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer. ### Claim 2 (depends on 1) The power storage device according to claim 1, wherein the device body has a functional portion comprising the first and second internal electrodes and the electrolyte-containing layer, and an outer layer portion surrounding the functional portion and forming the first and second principal surfaces and the first and second side surfaces of the device body, wherein at least one central portion of the functional portion is depressed and forms a depressed portion between the functional portion and the outer layer portion. ### Claim 3 (depends on 2) The power storage device according to claim 2, wherein the first principal surface of the device body is flatter than a principal surface of the functional portion. ### Claim 4 (depends on 3) The power storage device according to claim 3, further comprising a reinforcing member disposed in the depressed portion between the functional portion and the outer layer portion. ### Claim 5 (depends on 4) The power storage device according to claim 4, wherein the reinforcing member comprises a thermosetting resin, an epoxy resin, or a phenol resin. ### Claim 6 (depends on 2) The power storage device according to claim 2, wherein a thickness of the functional portion at one of the first and second end surfaces is smaller than a thickness of the functional portion where the insulating adhesive portion is located. ### Claim 7 (depends on 6) The power storage device according to claim 6, wherein the thicknesses of the functional portion at the one of the first and second end surfaces is 0.8 to 0.9 times the thickness of the functional portion where the insulating adhesive portion is located. ### Claim 8 (depends on 1) The power storage device according to claim 1, wherein the device body has a functional portion comprising the first and second internal electrodes and the electrolyte-containing layer, and an outer layer portion surrounding the functional portion and forming the first and second principal surfaces and the first and second side surfaces of the device body, wherein opposed central portions of the functional portion are depressed and form depressed portions between the functional portion and the outer layer portion. ### Claim 9 (depends on 8) The power storage device according to claim 8, wherein the first principal surface of the device body is flatter than a principal surface of the functional portion. ### Claim 10 (depends on 9) The power storage device according to claim 9, further comprising a reinforcing member disposed in the depressed portion between the functional portion and the outer layer portion. ### Claim 11 (depends on 10) The power storage device according to claim 10, wherein the reinforcing member comprises a thermosetting resin, an epoxy resin, or a phenol resin. ### Claim 12 (depends on 8) The power storage device according to claim 8, wherein a thickness of the functional portion at one of the first and second end surfaces is smaller than a thickness of the functional portion where the insulating adhesive portion is located. ### Claim 13 (depends on 12) The power storage device according to claim 12, wherein the thicknesses of the functional portion at the one of the first and second end surfaces is 0.8 to 0.9 times the thickness of the functional portion where the insulating adhesive portion is located. ### Claim 14 (depends on 1) The power storage device according to claim 1, wherein the thickness of the insulating adhesive portion is 1.1 to 1.3 times the thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer. ### Claim 15 (depends on 1) The power storage device according to claim 1, further comprising: a first external electrode on the first end surface and electrically connected to the first internal electrode; and a second external electrode on the second end surface and electrically connected to the second internal electrode.