US4209571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary electrochemical cell
Assignee: Verizon Laboratories Inc
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Filing: 1975-08-28
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Granted: 1980-06-24
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Expires: 1995-08-28
Abstract
Abstract A primary electrochemical cell includes a thermal switch electrically connected between one of the electrodes and its associated terminal to prevent the cell from being discharged when the temperature inside the cell exceeds a predetermined level.
Inventors
- 👤 Richard A. Bessett
- 👤 James Epstein
- 👤 Franz Goebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:45
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/50; H01M50/572; H01M50/574; H01M50/581; H01M6/00; H01M6/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A primary electrochemical cell comprising a hermetically sealed housing, an electrochemical system disposed within the housing, said electrochemical system having a pair of electrodes comprising an anode and a cathode, and an electrolyte in contact therewith, and a thermal switch disposed within the housing, said switch being electrically connected between one of the electrodes and the terminal associated therewith and in series with the internal electrical circuit of the cell, said switch sensing the internal cell temperature and preventing the cell from discharging when the cell temperature exceeds a preselected level, and said thermal switch including tin electrical contacts encapsulated within a glass ampoule.
Claim 2
Dependent Claim
104 words
A primary electrochemical cell comprising a hermetically sealed housing, an electrochemical system disposed within the housing, said electrochemical system having a pair of electrodes comprising an anode and a cathode, and an electrolyte in contact therewith, and a thermal switch disposed within the housing, said switch being electrically connected between one of the electrodes and the terminal associated therewith and in series with the internal electrical circuit of the cell, said switch sensing the internal cell temperature and preventing the cell from discharging when the cell temperature exceeds a preselected level, and said thermal switch including tin electrical contacts encapsulated within a glass ampoule.
Claim 3
Dependent Claim
136 words
A primary electrochemical cell comprising a hermetically sealed housing, an electrochemical system disposed within the housing, said electrochemical system having a pair of electrodes comprising an oxidizable anode and a cathode, and an electrolytic solution comprising a covalent inorganic oxyhalide solvent of phosphorus oxychloride, sulfuryl chloride, thionyl chloride, or a mixture thereof, and a solute dissolved therein, in contact therewith, and a thermal switch disposed within the housing, said switch being electrically connected between one of the electrodes and the terminal associated therewith and in series with the internal electrical circuit of the cell, said switch sensing the internal cell temperature and preventing the cell from discharging when the cell temperature exceeds a preselected level, wherein said thermal switch opens at about 105° C. to 115° C. and resets at about 50° C. to 85° C.
Claim 4
Dependent Claim
136 words
A primary electrochemical cell comprising a hermetically sealed housing, an electrochemical system disposed within the housing, said electrochemical system having a pair of electrodes comprising an oxidizable anode and a cathode, and an electrolytic solution comprising a covalent inorganic oxyhalide solvent of phosphorus oxychloride, sulfuryl chloride, thionyl chloride, or a mixture thereof, and a solute dissolved therein, in contact therewith, and a thermal switch disposed within the housing, said switch being electrically connected between one of the electrodes and the terminal associated therewith and in series with the internal electrical circuit of the cell, said switch sensing the internal cell temperature and preventing the cell from discharging when the cell temperature exceeds a preselected level, wherein said thermal switch opens at about 105° C. to 115° C. and resets at about 50° C. to 85° C.
Claim 5
Independent Claim
146 words
A method of preventing over discharging of an electrochemical cell comprising providing an electrochemical cell having a hermetically sealed housing, an electrochemical system within the housing having a pair of electrodes and an electrolyte in contact with the electrodes, and a thermal switch within the housing, the switch being electrically connected between one of the electrodes and the terminal associated therewith, the switch preventing discharging of the cell when the cell temperature reaches a first preselected level, and the switch permitting further discharging of the cell when the cell temperature reaches a lower, second preselected temperature level, discharging the cell, whereby, if the cell temperature reaches the first preselected level, the thermal switch prevents further discharging of the cell, permitting the cell, after a thermal-switch controlled interruption of cell discharge, to cool to the second preselected temperature, and discharging the cell at least one additional time.
Claim 6
Independent Claim
146 words
A method of preventing over discharging of an electrochemical cell comprising providing an electrochemical cell having a hermetically sealed housing, an electrochemical system within the housing having a pair of electrodes and an electrolyte in contact with the electrodes, and a thermal switch within the housing, the switch being electrically connected between one of the electrodes and the terminal associated therewith, the switch preventing discharging of the cell when the cell temperature reaches a first preselected level, and the switch permitting further discharging of the cell when the cell temperature reaches a lower, second preselected temperature level, discharging the cell, whereby, if the cell temperature reaches the first preselected level, the thermal switch prevents further discharging of the cell, permitting the cell, after a thermal-switch controlled interruption of cell discharge, to cool to the second preselected temperature, and discharging the cell at least one additional time.
Claim 7
Dependent Claim
63 words
The method of claim 3 wherein one of the electrodes is a lithium anode, the other electrode is a carbon cathode, the electrolyte comprises phosphorus oxychloride, sulfuryl chloride, thionyl chloride or mixtures thereof and a solute dissolved therein; the first preselected temperature level is about 105° C. to 115° C.; and the second preselected temperature level is about 50° C. to 85° C.
References Cited (Backward Citations)
US2289128A
Cited
US2876271A
Cited
US3081366A
Cited
US3546024A
Cited
US3617386A
Cited
US3939011A
Cited
US3885991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |