US4450213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cell having improved abuse resistance
Assignee: Duracell Inc USA
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Filing: 1982-01-18
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Granted: 1984-05-22
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Expires: 2002-01-18
Abstract
Abstract A non-aqueous cell having a lithium anode is made abuse resistant by sandwiching and enclosing a thin substantially perforation-free copper foil or sheet between layers of lithium whereby the copper is isolated from the cell electrolyte.
Inventors
- 👤 Arabinda N. Dey
- 👤 Robert W. Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:44
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M6/00; H01M6/14; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A method for making a non-aqueous electrochemical cell having improved abuse resistance wherein a cathode, an alkali or alkaline earth metal anode and a fluid non-aqueous electrolyte are placed in operative association within a cell container to make said cell, characterized in that said method comprises the steps of placing and substantially totally enclosing a substantially perforation-free layer of copper within said anode metal prior to placing said anode metal within said cell container and filling said cell container with a fluid non-aqueous electrolyte in which said copper is soluble or ionizable.
Claim 2
Independent Claim
92 words
A method for making a non-aqueous electrochemical cell having improved abuse resistance wherein a cathode, an alkali or alkaline earth metal anode and a fluid non-aqueous electrolyte are placed in operative association within a cell container to make said cell, characterized in that said method comprises the steps of placing and substantially totally enclosing a substantially perforation-free layer of copper within said anode metal prior to placing said anode metal within said cell container and filling said cell container with a fluid non-aqueous electrolyte in which said copper is soluble or ionizable.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said copper layer has a surface area between 25-80% that of the surface area of said anode which is operatively associated with said cathode.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein said surface area of said copper layer is between 40-80% that of the surface area of said anode operatively associated with said cathode.
Claim 5
Independent Claim
20 words
The method of claims 1 or 2 wherein the thickness of said copper layer is between 5-50% of said anode.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the thickness of said copper layer is between 10-20% of said anode.
Claim 7
Independent Claim
14 words
The method of claims 1,2,3 or 5 wherein said anode is comprised of lithium.
Claim 8
Dependent Claim
39 words
The method of claim 1 wherein said anode is comprised of lithium, said cathode is of an inert carbonaceous material and said electrolyte includes a fluid cathode depolarizer selected from the group consisting of sulfur dioxide and thionyl chloride.
Claim 9
Dependent Claim
26 words
The method of claim 7 wherein said copper layer has a surface area between 40-80% that of the lithium anode operatively associated with said carbonaceous cathode.
Claim 10
Dependent Claim
15 words
An abuse resistance cell made in accordance with the method of claims 1,7 or 8.
References Cited (Backward Citations)
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US4184014A
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US4262065A
Cited
US4264690A
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US4331745A
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US4335191A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |