US3584285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for charging electric battery cell
Assignee: Yardney International Corp
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Filing: 1969-12-15
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Granted: 1971-06-08
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Expires: 1989-12-15
Abstract
Abstract There is disclosed a method of controlling the charge applied to a battery to minimize gas formation. Each of the battery cells includes an auxiliary electrode. Charging current is applied to the battery while the recombination current flowing in the auxiliary electrode circuit is detected. The charging current is interrupted when the recombination current in any one of the cells reaches a preselected upper limit and is reinstated when the recombination currents in all of the cells reach a preselected lower level. The interruption and resumption of charge current is repeated until the battery reaches a desired charge level.
Inventors
- 👤 Jerome Goodkin
- 👤 George Abbe Dalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:29
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/971; H02J7/973; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
219 words
A system for charging an electric battery cell having a pair of main electrodes and an auxiliary electrode for developing a potential difference with reference to one of said main electrodes depending upon the state of charge of the cell, comprising: a source of charging current connectable across said main electrodes; switch means in series with said source for interrupting the flow of said current and including a gate-controlled rectifier having an anode-cathode path in series with said source; detector means connected between said auxiliary electrode and said one of said main electrodes of the cell for sensing the magnitude of a recombination current flowing therebetween, said detector means having a first output carrying a seton signal in response to magnitudes of said recombination current up to a predetermined lower level and a second output carrying a setoff signal in response to magnitudes of said recombination current exceeding a predetermined upper level, said detector means comprising a pair of differently biased saturable-core transformers with output windings respectively connected to said first and second outputs, and serially connected input windings bridging said auxiliary electrode and said one of said main electrodes; and control means connected to said outputs for closing said switch means in response to said seton signal and opening said switch means in response to said setoff signal.
Claim 2
Independent Claim
219 words
A system for charging an electric battery cell having a pair of main electrodes and an auxiliary electrode for developing a potential difference with reference to one of said main electrodes depending upon the state of charge of the cell, comprising: a source of charging current connectable across said main electrodes; switch means in series with said source for interrupting the flow of said current and including a gate-controlled rectifier having an anode-cathode path in series with said source; detector means connected between said auxiliary electrode and said one of said main electrodes of the cell for sensing the magnitude of a recombination current flowing therebetween, said detector means having a first output carrying a seton signal in response to magnitudes of said recombination current up to a predetermined lower level and a second output carrying a setoff signal in response to magnitudes of said recombination current exceeding a predetermined upper level, said detector means comprising a pair of differently biased saturable-core transformers with output windings respectively connected to said first and second outputs, and serially connected input windings bridging said auxiliary electrode and said one of said main electrodes; and control means connected to said outputs for closing said switch means in response to said seton signal and opening said switch means in response to said setoff signal.
Claim 3
Dependent Claim
39 words
A system as defined in claim 1 wherein said control means comprises a logic circuit operative to close said switch means upon deenergization of said first output and to open said switch means upon energization of said second output.
Claim 4
Dependent Claim
25 words
A system as defined in claim 2 wherein said logic circuit includes bistable means settable by one and resettable by the other of said signals.
References Cited (Backward Citations)
US3477009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |