Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1981-07-10
1983-05-17
Walton, Donald L.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429224, H01M 450
Patent
active
043840299
ABSTRACT:
A rechargeable galvanic element with constant-volume positive manganese dioxide electrode. In a rechargeable galvanic element having an alkaline electrolyte and a positive manganese dioxide electrode the volumetric change of the electrode body caused by phase transformation, which entails undesired contact losses, is largely prevented by exertion of a steady pressure upon the electrode surfaces. For a concentric electrode arrangement, this can be done with particular effectiveness. For example, the pre-pressed MnO.sub.2 electrode can be forced into a rigid cylindrical metal cage, while the annular slot enclosed by the housing cup, lid and bottom insulation is occupied by the zinc electrode. In other cases, continuous take-off contact is preferable, using pressure springs or tensioned metal mesh which extend over the flat electrodes.
REFERENCES:
patent: 3116172 (1963-12-01), Wilke et al.
patent: 3716411 (1973-02-01), Ogawa et al.
patent: 4091178 (1978-05-01), Kordesch
patent: 4268689 (1981-05-01), Tamminen
Gsellmann Josef
Kordesch Karl
Varta Batterie Aktiengesellschaft
Walton Donald L.
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