US4959604A
Expired / Lapsed
US
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Process for ultra-rapidly charging a sealed nickel-cadmium storage battery
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1988-12-01
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Granted: 1990-09-25
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Expires: 2008-12-01
Abstract
Abstract A process for charging a sealed nickel-cadium storage battery in a time on the order of three to fifteen minutes. Charging is performed at a constant charging voltage which is lower than the voltage at which hydrogen is released at the negative electrode of the storage battery. Charging is terminated when the charging current intensity of the storage battery registers a significant increase following a gradual decrease during the charging process.
Inventors
- 👤 Rosendo Cuesta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:31
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/24; H01M10/30; H02; H02J; H02J7/00; H02J7/90; H02J7/94; H02J7/953; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A process for ultra-rapidly charging a sealed nickel-cadmium storage battery, wherein the charging process comprises: applying to the battery a charging voltage which is sufficient to complete the charging process in a time on the order of three to fifteen minutes but is lower than a voltage at which hydrogen is released in gaseous form, and terminating the charging voltage when charging current intensity registers a significant increase following a gradual decrease.
Claim 2
Dependent Claim
72 words
A process for ultra-rapidly charging a sealed nickel-cadmium storage battery, wherein the charging process comprises: applying to the battery a charging voltage which is sufficient to complete the charging process in a time on the order of three to fifteen minutes but is lower than a voltage at which hydrogen is released in gaseous form, and terminating the charging voltage when charging current intensity registers a significant increase following a gradual decrease.
Claim 3
Dependent Claim
29 words
A charging process as claimed in claim 1, wherein the charging voltage supplied to the storage battery is limited to a value ranging from 1.60 to 1.67 volts inclusive.
Claim 4
Dependent Claim
52 words
A charging process as claimed in either claim 1 or claim 2, wherein the charging current is equal to a value of five to twenty-five times the capacity of the storage battery to be charged and wherein the said significant increase in current is on the order of 0.5 to 1 ampere.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |