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Galvanic element, particularly alkaline storage battery
| Details |
Inventors: Winsel, August;
Assignee: Varta Batterie Aktiengesellschaft (DE)
Primary Examiner: Lefevour; Charles F.
Assistant Examiner:
Attorney, Agent or Firm: Weiser, Stapler & Spivak
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. |
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DETAILED DESCRIPTION I claim: 1.
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.
sub.
2.
2.
The element of claim 1 wherein the passive oxide has been formed through tempering in the presence of oxygen.
3.
The element of claim 1 wherein the passive oxide has a thickness of between about 5 and 30 molecular layers.
4.
The element of claim 1 wherein the passive oxide forms an uninterrupted band along the periphery of the seal.
5.
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.
6.
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.
7.
The element of claim 1 wherein the passive oxide has been formed by chemical or electrochemical oxidation and subsequent tempering.
8.
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.
sub.
2 and oxides of chromium and tantalum.
Description:
The invention relates to a galvanic element, and particularly an alkaline storage battery, whose active elements are contained within a housing which is closed in liquid-tight manner by means of a lid with an interposed seal
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