Patent US4246326A successfully refreshed from Google Patents.
US4246326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer auxiliary electrode
Assignee: VARTA Batterie AG
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Filing: 1979-05-25
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Granted: 1981-01-20
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Expires: 1999-05-25
Abstract
Abstract For oxygen reduction in a battery an auxiliary electrode is provided having two layers, one with hydrophilic characteristics, the other hydrophobic. The hydrophilic layer is preferably of activated carbon bound in plastic and the hydrophobic layer of porous polytetrafluorethylene. Electrical contact is established between a conductor on the outside of the activated carbon layer and the negative main electrode. Preferably the exposed surface of the auxiliary electrode is provided with a metal ion barrier. Also preferably at least two such auxiliary electrodes are provided to make the battery orientation insensitive.
Inventors
- 👤 Dietrich Sprengel
- 👤 Helmut Halbig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:30
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/34; H01M10/42; H01M10/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A galvanic element and particularly a gas-tight closed storage battery having positive and negative electrodes and having an auxiliary electrode electrically connected with the latter for reduction of oxygen pressure, wherein the auxiliary electrode is a two-layer electrode, one layer being capable of catalyzing the oxygen reduction and being hydrophilic and contacting the negative electrode, and the other layer having hydrophobic characteristics.
Claim 2
Dependent Claim
62 words
A galvanic element and particularly a gas-tight closed storage battery having positive and negative electrodes and having an auxiliary electrode electrically connected with the latter for reduction of oxygen pressure, wherein the auxiliary electrode is a two-layer electrode, one layer being capable of catalyzing the oxygen reduction and being hydrophilic and contacting the negative electrode, and the other layer having hydrophobic characteristics.
Claim 3
Dependent Claim
32 words
The element of claim 1 wherein the hydrophilic layer of the auxiliary electrode is made of activated carbon bound by plastic material, and the hydrophobic layer consists of a porous polytetrafluorethylene foil.
Claim 4
Dependent Claim
20 words
The element of claim 1 wherein a metal fabric grid is rolled onto the hydrophilic layer of the auxiliary electrode.
Claim 5
Dependent Claim
24 words
The element of claim 3 wherein the metal fabric grid consists of materials selected from the group of pure silver, nickel and nickel-plated iron.
Claim 6
Dependent Claim
50 words
The element of claim 1 having at least two auxiliary electrodes at diametrically opposite locations in the cell, one of said auxiliary electrodes being in firm electrically conductive contact with the topmost negative electrode, while the other auxiliary electrode is in firm electrically conductive contact with the lowermost negative electrode.
Claim 7
Dependent Claim
104 words
A galvanic element and particularly a gas-tight closed storage battery having positive and negative electrodes and having an auxiliary electrode electrically connected with the latter for reduction of oxygen pressure, wherein the auxiliary electrode is a two-layer electrode, one layer being capable of catalyzing the oxygen reduction and being hydrophilic, the other layer having hydrophobic characteristics, said galvanic element having at least two auxiliary electrodes at diametrically opposite locations in the cell, one of said auxiliary electrodes being in firm electrically conductive contact with the topmost negative electrode, while the other auxiliary electrode is in firm electrically conductive contact with the lowermost negative electrode.
Claim 8
Dependent Claim
104 words
A galvanic element and particularly a gas-tight closed storage battery having positive and negative electrodes and having an auxiliary electrode electrically connected with the latter for reduction of oxygen pressure, wherein the auxiliary electrode is a two-layer electrode, one layer being capable of catalyzing the oxygen reduction and being hydrophilic, the other layer having hydrophobic characteristics, said galvanic element having at least two auxiliary electrodes at diametrically opposite locations in the cell, one of said auxiliary electrodes being in firm electrically conductive contact with the topmost negative electrode, while the other auxiliary electrode is in firm electrically conductive contact with the lowermost negative electrode.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |