US4128705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Galvanic element, particularly alkaline storage battery
Assignee: VARTA Batterie AG
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Filing: 1977-07-29
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Granted: 1978-12-05
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Expires: 1997-07-29
Abstract
Abstract In a galvanic element which has a tendency to leak electrolyte at the lid seal, there is formed, on the metal enclosure portion which bears against the seal, a passive oxide surface layer which is not reducible at the negative electrode potential.
Inventors
- 👤 August Winsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:41
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/10; H01M50/102; H01M50/109; H01M10/00; H01M10/34; H01M50/183; H01M50/186; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
In a nickel/cadmium electrode battery with alkaline electrolyte, which battery has a housing having two portions and a seal interposed between said portions to close the housing in liquid-tight manner, one portion of the housing having a metal surface bearing against the seal and also connected to the cadmium electrode, the improvement wherein a passive oxide layer covers the said metal surface bearing against the seal, the oxide layer being non-reducible at the potential of the negative electrode, and being selected from the group of NiO and TiO 2 .
Claim 2
Dependent Claim
90 words
In a nickel/cadmium electrode battery with alkaline electrolyte, which battery has a housing having two portions and a seal interposed between said portions to close the housing in liquid-tight manner, one portion of the housing having a metal surface bearing against the seal and also connected to the cadmium electrode, the improvement wherein a passive oxide layer covers the said metal surface bearing against the seal, the oxide layer being non-reducible at the potential of the negative electrode, and being selected from the group of NiO and TiO 2 .
Claim 3
Dependent Claim
19 words
The element of claim 1 wherein the passive oxide has been formed through tempering in the presence of oxygen.
Claim 4
Dependent Claim
20 words
The element of claim 1 wherein the passive oxide has a thickness of between about 5 and 30 molecular layers.
Claim 5
Dependent Claim
19 words
The element of claim 1 wherein the passive oxide forms an uninterrupted band along the periphery of the seal.
Claim 6
Dependent Claim
26 words
The element of claim 1 wherein the passive oxide layer is formed by oxidation of the surface of the material from which the housing is made.
Claim 7
Dependent Claim
26 words
The element of claim 1 wherein the surface layer is formed of a thin application of the oxide material to the surface of the housing portion.
Claim 8
Dependent Claim
20 words
The element of claim 1 wherein the passive oxide has been formed by chemical or electrochemical oxidation and subsequent tempering.
Claim 9
Dependent Claim
98 words
In a storage battery with positive and negative electrodes and alkaline electrolyte, which battery has a housing having two portions and a seal interposed between said portions to close the housing in liquid-tight manner, one portion of the housing having a metal surface bearing against the seal and also connected to the negative electrode, the improvement wherein a passive oxide layer covers the said metal surface bearing against the seal, the oxide layer being non-reducible at the potential of the negative electrode, and being selected from the group of NiO, TiO 2 and oxides of chromium and tantalum.
Claim 10
Dependent Claim
98 words
In a storage battery with positive and negative electrodes and alkaline electrolyte, which battery has a housing having two portions and a seal interposed between said portions to close the housing in liquid-tight manner, one portion of the housing having a metal surface bearing against the seal and also connected to the negative electrode, the improvement wherein a passive oxide layer covers the said metal surface bearing against the seal, the oxide layer being non-reducible at the potential of the negative electrode, and being selected from the group of NiO, TiO 2 and oxides of chromium and tantalum.
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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |