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US4184014A Expired / Lapsed US ⏱️ 0.0 years remaining

Abuse resistant cells containing fluid depolarizers

Assignee: Duracell Inc USA
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Filing: 1978-11-24
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Granted: 1980-01-15
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Expires: 1998-11-24
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Abstract

Abstract Abuse resistant electrochemical cells having consumable fluid depolarizer/electrolyte solvents, active metal anodes and inactive conductive cathodes which are made resistant to abusive forced discharge or cell reversal conditions by maintaining excess portions of both the fluid depolarizer/electrolyte solvent with electrolyte and the active metal anode at the end of cell discharge. The remaining portion of the active metal is electrically connected to the negative terminal of the cell and substantially faces the entire surface of the originally adjacent inactive cathode. The remaining portion of the fluid depolarizer/electrolyte solvent is sufficient for maintaining electrical and thermal conductivity whereby heat concentration is prevented.

Inventors

  • 👤 Arabinda N. Dey

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 13:02
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; Y; Y02; Y02E; Y02E60/00; Y02E60/10

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 226 words
An abuse resistant electrochemical cell comprising an active metal anode selected from the group consisting of lithium, sodium, potassium, berylium, magnesium, calcium, and aluminum electrically connected to a terminal therefor, and an inactive conductive cathode, with said anode and cathode having surfaces thereof respectively which face each other, said cell further comprising a fluid depolarizer/electrolyte solvent selected group consisting of inorganic oxyhalides, inorganic thiohalides, nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), and sulfur trioxide (SO 3 ) with electrolyte salt dissolved therein with said anode and cathode being immersed in said fluid depolarizer, characterized in that said active metal anode and said fluid depolarizer/electrolyte solvent are each present in excess of the dischargeable capacity of said cell, with said excess active metal anode being of an amount sufficient such that a surface thereof remains substantially facing said initially facing surface of said cathode, with said excess active metal anode remaining electrically connected to said terminal; and said excess fluid depolarizer/electrolyte solvent being of an amount sufficient to substantially wet said excess anode and said cathode, whereby current may be conducted therethrough without heat concentration within said cell, and wherein said excess fluid depolarizer/electrolyte solvent contains sufficient electrolyte salt dissolved therein whereby said fluid depolarizer, with dissolved salt, retains a conductivity sufficiently high such that current may be carried therethrough without resistance heat buildup.
Claim 2
Dependent Claim 226 words
An abuse resistant electrochemical cell comprising an active metal anode selected from the group consisting of lithium, sodium, potassium, berylium, magnesium, calcium, and aluminum electrically connected to a terminal therefor, and an inactive conductive cathode, with said anode and cathode having surfaces thereof respectively which face each other, said cell further comprising a fluid depolarizer/electrolyte solvent selected group consisting of inorganic oxyhalides, inorganic thiohalides, nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), and sulfur trioxide (SO 3 ) with electrolyte salt dissolved therein with said anode and cathode being immersed in said fluid depolarizer, characterized in that said active metal anode and said fluid depolarizer/electrolyte solvent are each present in excess of the dischargeable capacity of said cell, with said excess active metal anode being of an amount sufficient such that a surface thereof remains substantially facing said initially facing surface of said cathode, with said excess active metal anode remaining electrically connected to said terminal; and said excess fluid depolarizer/electrolyte solvent being of an amount sufficient to substantially wet said excess anode and said cathode, whereby current may be conducted therethrough without heat concentration within said cell, and wherein said excess fluid depolarizer/electrolyte solvent contains sufficient electrolyte salt dissolved therein whereby said fluid depolarizer, with dissolved salt, retains a conductivity sufficiently high such that current may be carried therethrough without resistance heat buildup.
Claim 3
Dependent Claim 52 words
The cell of claim 1 wherein said inactive conductive cathode is determinative of said dischargeable capacity of said cell with the capacity of said inactive conductive cathode, based upon the number of cell reaction sites therein, being less than the capacity of each of said active metal anode and said fluid depolarizer.
Claim 4
Dependent Claim 18 words
The cell of claim 2 wherein said inactive conductive cathode comprises activated carbon on a conductive metallic substrate.
Claim 5
Dependent Claim 19 words
The cell of claim 3 wherein said conductivity is not less than 10 -3 ohm -1 cm -1 .
Claim 6
Dependent Claim 91 words
The cell of claim 3 wherein said fluid depolarizer is selected from the group consisting of thionyl chloride (SOCl 2 ), phosphorous oxychloride (POCl 3 ), selenium oxychloride (SeOCl 2 ), sulfur dioxide (SO 2 ), sulfur trioxide (SO 3 ), vanadium oxytrichloride (VOCl 3 ), chromyl chloride (CrO 2 Cl 2 ), sulfuric oxychloride (SO 2 Cl 2 ), nitryl chloride ((NO 2 Cl), nitrosyl chloride (NOCl), nitrogen dioxide (NO 2 ), sulfur monochloride (S 2 Cl 2 ) and sulfur monobromide (S 2 Br 2 ) and mixtures thereof.
Claim 7
Dependent Claim 12 words
The cell of claim 5 wherein said fluid depolarizer comprises thionyl chloride.
Claim 8
Dependent Claim 28 words
The cell of claim 6 wherein said electrolyte salt is lithium aluminum chloride and wherein said conductivity is not less than 10 -3 ohm -1 cm -1 .
Claim 9
Dependent Claim 12 words
The cell of claim 6 wherein said active metal anode comprises lithium.
Claim 10
Dependent Claim 16 words
The cell of claim 8 wherein said active metal anode further includes a conductive metallic substrate.
Claim 11
Dependent Claim 17 words
The cell of claim 2 wherein said fluid depolarizer comprises thionyl chloride and said anode is lithium.
Claim 12
Dependent Claim 12 words
The cell of claim 1 wherein said fluid depolarizer comprises thiony choride.

References Cited (Backward Citations)

US4012564A Cited
US4115629A Cited
US4093784A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-01-14 1983-07-16 1984-01-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-01-14 1987-07-16 1988-01-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-01-14 1991-07-16 1992-01-15 $7700.00 Window Closed / Lapsed

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