US3689776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation of parallel cell stacks in thermal batteries by a squib switch
Assignee: United States Department of the Army
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Filing: 1970-08-25
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Granted: 1972-09-05
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Expires: 1990-08-25
Abstract
Abstract A squib switch is used to reliably isolate and transfer power to an external load in the presence of high nuclear and thermal radiations. The squib switch is used in an electrical circuit to remove the fast activate battery from the external load after a long life, slow activate thermal power battery connected in parallel, comes up to voltage. The electrical circuit provides for cell isolation so that the fast rise time of the fast activate battery can be combined with the long life characteristic of the slow activate battery without having the residual internal impedance of the fast activate battery dissipate energy from the power battery.
Inventors
- 👤 David G Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:45
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/045; F42D1/05; H; H01; H01M; H01M6/00; H01M6/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
An electrical circuit for isolating cell stacks of thermal batteries supplying energy to an external load, which comprises: a thermal starter battery of the fast activate type; a thermal power battery of the slow activate type electrically coupled in parallel with said starter battery; and means for electrically isolating said starter battery from said external load and said power battery a short interval of time after initiation of said starter and power batteries thereby preventing said starter battery low internal impedance form dissipating energy from said power battery and supplying said external load with a source of power which has the rapid voltage and current rise time characteristics of said starter battery and the long life characteristics of said power battery.
Claim 2
Dependent Claim
121 words
An electrical circuit for isolating cell stacks of thermal batteries supplying energy to an external load, which comprises: a thermal starter battery of the fast activate type; a thermal power battery of the slow activate type electrically coupled in parallel with said starter battery; and means for electrically isolating said starter battery from said external load and said power battery a short interval of time after initiation of said starter and power batteries thereby preventing said starter battery low internal impedance form dissipating energy from said power battery and supplying said external load with a source of power which has the rapid voltage and current rise time characteristics of said starter battery and the long life characteristics of said power battery.
Claim 3
Dependent Claim
72 words
A cell stack isolation circuit as recited in claim 1 wherein said isolating means comprises: a delay squib switch having normally closed contacts for electrically connecting said starter battery in parallel with said power battery; a delay squib match electrically connected in parallel with said starter battery; and an explosive charge operatively positioned intermediate said squib match and said squib switch, said match activating said charge which explosively opens said squib switch.
References Cited (Backward Citations)
US3592697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |