US5115378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric double layer capacitor
Assignee: Isuzu Motors Ltd
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Filing: 1991-02-11
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Granted: 1992-05-19
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Expires: 2011-02-11
Abstract
Abstract An electric double layer capacitor has an electric double layer composed of an interface between activated carbon and electrolyte. The electric double layer capacitor includes a pair of polarized electrodes each comprising an electrode body in the form of a porous sintered body of joined active carbon particles. When the electrode body is sintered, an electrically conductive layer is formed on a surface of the electrode body. With this construction, the contact resistance between the electrode body and a current collector through the electrically conductive layer is reduced, so that the electric double layer has a reduced internal resistance.
Inventors
- 👤 Yoshinobu Tsuchiya
- 👤 Ken Kurabayashi
- 👤 Seiichiro Kito
- 👤 Yoriaki Niida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:18
CPC Classifications
H; H01; H01G; H01G9/00; H01G11/00; H01G11/22; H01G11/26; H01G11/30; H01G11/32; H01G11/38; H01G11/84; H01G11/86; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
An electric double layer capacitor having an electric double layer composed of an interface between activated carbon and electrolyte, comprising: a pair of electrode bodies having surfaces confronting each other, each of said electrode bodies comprising a porous sintered body of joined active carbon particles; a pair of electrically conductive layers formed on and fused to respective other surfaces of said electrode bodies at the time the electrode bodies are sintered; a separator interposed between said electrode bodies; a gasket housing said electrode bodies and said separator therein; and a pair of current collectors disposed on the respective other surfaces of said electrode bodies in contact with said electrically conductive layers, respectively, said current collectors having respective peripheral edges joined to said gasket.
Claim 2
Dependent Claim
123 words
An electric double layer capacitor having an electric double layer composed of an interface between activated carbon and electrolyte, comprising: a pair of electrode bodies having surfaces confronting each other, each of said electrode bodies comprising a porous sintered body of joined active carbon particles; a pair of electrically conductive layers formed on and fused to respective other surfaces of said electrode bodies at the time the electrode bodies are sintered; a separator interposed between said electrode bodies; a gasket housing said electrode bodies and said separator therein; and a pair of current collectors disposed on the respective other surfaces of said electrode bodies in contact with said electrically conductive layers, respectively, said current collectors having respective peripheral edges joined to said gasket.
Claim 3
Dependent Claim
23 words
An electric double layer capacitor according to claim 1, wherein each of said electrically conductive layers comprises a sintered layer of metal powder.
Claim 4
Dependent Claim
20 words
An electric double layer capacitor according to claim 1, wherein each of said electrically conductive layers comprises a metal foil.
Claim 5
Independent Claim
110 words
A method of manufacturing a polarized electrode for an electric double layer capacitor having an electric double layer composed of an interface between activated carbon and electrolyte, said method comprising the steps of: placing an electrically conductive material in a sintering mold; placing powder of minute active carbon particles on said electrically conductive material in the sintering mold; pressing the powder of minute active carbon particles and the electrically conductive material in the sintering mold; and sintering the powder of minute active carbon particles and the electrically conductive material while under pressure, thereby forming an electrically conductive layer and an electrode body, respectively, which are intimately joined to each other.
Claim 6
Independent Claim
110 words
A method of manufacturing a polarized electrode for an electric double layer capacitor having an electric double layer composed of an interface between activated carbon and electrolyte, said method comprising the steps of: placing an electrically conductive material in a sintering mold; placing powder of minute active carbon particles on said electrically conductive material in the sintering mold; pressing the powder of minute active carbon particles and the electrically conductive material in the sintering mold; and sintering the powder of minute active carbon particles and the electrically conductive material while under pressure, thereby forming an electrically conductive layer and an electrode body, respectively, which are intimately joined to each other.
Claim 7
Dependent Claim
52 words
A method according to claim 4, wherein said step of sintering comprises the step of applying a pulsed electric current to the powder of minute active carbon particles and the electrically conductive material, and thereafter applying a heating current to the powder of minute active carbon particles and the electrically conductive material.
References Cited (Backward Citations)
JPS5670623A
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JPS5680120A
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US4562511A
Cited
US4616290A
Cited
JPS6454607A
Cited
JPH01246813A
Cited
JPH01290216A
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JPH0226009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |