Long-life galvanic primary cell

Details Long-life galvanic primary cell Long-life galvanic primary cell

1980-12-08

1982-03-09

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Preserving cell in storage feature

429145, 429125, H01M 218

Patent

active

043189679

ABSTRACT:
Disposed between the positive electrode and the negative electrode in addition to the separator layer is an electrolyte-impermeable inert film or foil about 5 to 50 microns thick. The film or foil includes a very small current-focusing aperture produced by piercing, punching, or melting. The entire electrolytic current is focused through this aperture. The area of the aperture is at least ten times smaller than the surface area of the separator layer. The thickness l of the film or foil and the radius r.sub.i of the aperture are governed by the relationship 4l/r.sub.i .ltoreq.10. The electrolyte-impermeable film or foil is sealingly clamped between the positive electrode and a sealing ring at the edge of the cell. The film or foil may be of a synthetic resin polymer material, of nickel, or of a nickel alloy. Self-discharge is decreased by the construction of the cell. The cell may be in a flat form without any appreciable decrease in the energy density taking place. Furthermore, the cell presents advantages when electrolytes having a low freezing point are used. The cell is well suited as a power source for electronic watches, pacemakers, or as a voltage source for electronic memories.

REFERENCES:
patent: 1920151 (1933-07-01), Ruben
patent: 3758343 (1973-09-01), Magritz

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