US4713126A
Expired / Lapsed
US
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Process for manufacturing negative cadmium electrodes for sealed alkaline battery cells
Assignee: VARTA Batterie AG
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Filing: 1986-05-08
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Granted: 1987-12-15
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Expires: 2006-05-08
Abstract
Abstract Undesirable heavy metal peroxides formed during the continuous partial oxidation of cadmium electrodes made from a charged strip of material, by means of H 2 O 2 , to introduce a charge reserve prior to incorporation in a sealed alkaline battery cell, are removed by an immersion treatment in an alkaline hydroxide solution, with simultaneous desorption of oxygen and removal of the heat of hydrogenation. A subsequent boric acid immersion bath is used to neutralize introduced alkaline residues and to improve the stability of the strip during storage. The phenomena which accompany peroxide decomposition (intense evolution of heat and sputtering of electrolyte) in the completely assembled cell during the introduction of the electrolyte, and which interfere with the metering of the electrolyte, are thus avoided.
Inventors
- 👤 Jurgen Woidt
- 👤 Wolfgang Fries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:02
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
A process for manufacturing negative cadmium electrodes for sealed alkaline battery cells, in strip form, wherein said electrodes are subjected to partial oxidation to form a charge reserve by a chemical treatment with oxidizing agents outside said cells, and wherein said process comprises the step of: subjecting the electrode strip to treatment in an alkaline solution, after or during said partial oxidation and prior to incorporation into a cell, to decompose formed heavy metal peroxides and to hydrogenate CdO into Cd(OH) 2 .
Claim 2
Dependent Claim
83 words
A process for manufacturing negative cadmium electrodes for sealed alkaline battery cells, in strip form, wherein said electrodes are subjected to partial oxidation to form a charge reserve by a chemical treatment with oxidizing agents outside said cells, and wherein said process comprises the step of: subjecting the electrode strip to treatment in an alkaline solution, after or during said partial oxidation and prior to incorporation into a cell, to decompose formed heavy metal peroxides and to hydrogenate CdO into Cd(OH) 2 .
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said alkaline solution is an aqueous potassium hydroxide or sodium hydroxide solution.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said alkaline solution is a reducing agent with an alkaline pH.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein said reducing agent is selected from the group consisting of sodium sulfide, sodium sulfite, hydrazine and hydroxylamine.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said alkaline solution has the density and composition of the electrolyte to be used in said cells.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the treatment is carried out by immersion in a continuous process.
Claim 8
Dependent Claim
42 words
The process of claim 1 wherein the treatment is carried out during said partial oxidation by simultaneously admitting a solution including the oxidizing agent used for said partial oxidation and the alkaline solution used for said treatment from a common spray nozzle.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said treatment is followed by a neutralizing immersion treatment in a weak acid.
Claim 10
Dependent Claim
15 words
The process of claim 8 wherein said immersion treatment is in a boric acid solution.
Claim 11
Dependent Claim
18 words
The process of claim 8 wherein the concentration of said acid exceeds the stoichiometric quantity needed for neutralization.
Claim 12
Dependent Claim
27 words
The process of claim 8 wherein the electrode strip is continuously passed through immersion baths arranged in series for said alkaline treatment and for said neutralizing treatment.
Claim 13
Dependent Claim
24 words
The process of claim 1 wherein said treatment is followed by a neutralizing immersion treatment in a metal salt solution with an acidic pH.
Claim 14
Dependent Claim
20 words
The process of claim 12 wherein the metal salt solution is a cadmium sulfate solution or a nickel sulfate solution.
Claim 15
Dependent Claim
15 words
The process of claim 1 wherein said oxidizing agent is hydrogen peroxide or potassium peroxydisulfate.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |