Electrical double layer capacitor

• US 6,320,741 B1
• Filed: 09/07/2000
• Issued: 11/20/2001
• Est. Priority Date: 09/29/1999
• Status: Expired due to Fees

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Corporation
• Inventors: Arai, Satoshi, Ohya, Masako
• Primary Examiner(s): Dinkins, Anthony
• Application Number:
  US09/657,211
• Time in Patent Office: 439 Days
• Field of Search: 361/502, 361/511, 361/512, 361/522
• US Class Current: 361/502
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/80 Gaskets; Sealings
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

The present invention provides a electrical double layer capacitor that can prevent the leakage of an electrolyte solution to the outside that is caused by the fractures occurring in the collectors, and thereby both the yield during manufacture processing and the reliability can be improved. Chamfered portions 20 are formed on the corners that are the border between components that are adjacent to the surfaces 12a and 12a of the polarizing electrodes 12 that do not contact a separator 11 and a collector 13, and thereby, the stress focus on these corners, which occurs easily at the contacting portions between the polarizing electrode 12 and the collector 13, occurs with difficulty.

Claims

1. An electrical double layer capacitor providing one basic cell or two or more layers of basic cells, the basic cells comprising separators, pairs of polarizing electrodes that are disposed so as to contact the respective separator on both sides thereof, a pair of collectors positioned so as to contact the surface of these polarizing electrodes opposite to those of said separators, and gaskets disposed in proximity to the polarizing electrodes, and wherein

chamfered portions are formed on at least one among the corner that is a border between components adjacent to the surfaces of said polarizing electrodes that do not contact said separator or said collector, and the corner that is the border of the surface of said polarizing electrode that contacts said collector and the surface that does not contact said separator and said collector that is adjacent to said surface.

2. An electrical double layer capacitor according to claim 1 wherein chamfered portions are formed on the corners that are the border between components adjacent to the surface of said gasket that face said polarizing electrodes.

3. An electrical double layer capacitor according to claim 1 wherein projections that position said polarizing electrode with respect to said gasket are formed on at least one of said gasket and said polarizing electrodes.

4. An electrical double layer capacitor according to claim 2 wherein projections that position said polarizing electrode with respect to said gasket are formed on at least one of said gasket and said polarizing electrodes.

5. An electrical double layer capacitor providing one basic cell or two or more layers of basic cells, the basic cells comprising separators, pairs of polarizing electrodes that are disposed so as to contact the respective separator on both sides thereof, a pair of collectors positioned so as to contact the surface of these polarizing electrodes opposite to those of said separators, and a gasket disposed in proximity to the polarizing electrodes, and wherein

chamfered portions are formed on the corner that is the border between components adjacent to the surface of said gasket that faces said polarizing electrodes.

6. A two layered electric capacitor according to claim 5 wherein projections that position said polarizing electrodes with respect to said gasket are formed on at least one of said gasket and said polarizing electrodes.

7. An electrical double layer capacitor providing one basic cell or two or more layers of basic cells, the basic cells comprising separators, pairs of polarizing electrodes that are disposed so as to contact the respective separator on both sides thereof, a pair of collectors positioned so as to contact the surface of these polarizing electrodes opposite to those of said separators, and a gasket disposed in proximity to the polarizing electrodes, and wherein

projections that position said polarizing electrodes with respect to said gasket are formed on at least one of said gasket and said polarizing electrodes.