Patent US4188460A successfully refreshed from Google Patents.
US4188460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal battery fuse
Assignee: Duracell Inc USA
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Filing: 1978-05-01
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Granted: 1980-02-12
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Expires: 1998-05-01
Abstract
Abstract An internal battery fuse comprising a portion of a current collector which is thermally shielded whereby excessive built-up heat resulting from a short circuit is concentrated in said portion and which heat fuses the shielded portion and interrupts the circuit prior to excessive internal pressure conditions.
Inventors
- 👤 Hong Y. Kang
- 👤 Per Bro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:56
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/50; H01M50/572; H01M50/574; H01M50/581; H01M50/583; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
An electrochemical cell comprising a container containing a first electrode, a second electrode, liquid electrolyte and one or more current collectors electrically connected to at least one of said electrodes with said current collector electrically engaged with a section of said container characterized in that a portion of said current collector between said electrical connection and electrical engagement is enclosed by thermal shielding means and said enclosed portion is immersed in said electrolyte whereby excessive heat generated by ohmic dissipation within said current collector caused by a short circuit of said cell is retained within said enclosed portion to fuse said portion and interrupt the circuit.
Claim 2
Dependent Claim
106 words
An electrochemical cell comprising a container containing a first electrode, a second electrode, liquid electrolyte and one or more current collectors electrically connected to at least one of said electrodes with said current collector electrically engaged with a section of said container characterized in that a portion of said current collector between said electrical connection and electrical engagement is enclosed by thermal shielding means and said enclosed portion is immersed in said electrolyte whereby excessive heat generated by ohmic dissipation within said current collector caused by a short circuit of said cell is retained within said enclosed portion to fuse said portion and interrupt the circuit.
Claim 3
Dependent Claim
25 words
The cell of claim 1 wherein said portion of said current collector is of a smaller cross section than the remainder of said current collector.
Claim 4
Dependent Claim
28 words
The cell of claim 2 wherein said thermal shielding means comprises a heat sealed film comprised of a polyolefin selected from the group consisting of polyethylene and polypropylene.
Claim 5
Dependent Claim
13 words
The cell of claim 1 wherein said first electrode is comprised of lithium.
Claim 6
Dependent Claim
17 words
The cell of claim 4 wherein said electrolyte includes sulfur dioxide dissolved therein as a cathode depolarizer.
Claim 7
Dependent Claim
21 words
The cell of claim 1 wherein portion is dimensioned such that it fuses when subjected to a current of 5 amperes.
Claim 8
Dependent Claim
21 words
The cell of claim 1 wherein said current collector comprises a metal selected from the group consisting of nickel and aluminum.
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) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |