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Hermetically-sealed-galvanic-cell

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Hermetically sealed galvanic cell

Details

Inventors: Nientiedt, Heinz-Werner; Sekler, Josef;
Assignee: Varta Batterie Aktiengesellschaft (Hanover, DE)
Primary Examiner: Walton; Donald L.
Assistant Examiner:
Attorney, Agent or Firm: Weiser & Stapler

A plastic sealing member for sealing the housing cup of a round-type galvanic cell, and which is provided with a predetermined breaking point (bursting membrane or score) to prevent explosion of the cell during improper use, is covered on the surface which faces the inside of the cell with a pore-free film of bitumen, a synthetic resin, an adhesive, or a lacquer, at least over the predetermined breaking point and its immediate vicinity, to inhibit stress corrosion cracking which propagates under high mechanical stress and under the effect of the alkaline electrolyte, without reducing the intended bursting pressure.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a sealing member with a predetermined breaking point, and which is resistant to premature bursting, even in the presence of alcaline electrolyte and elevated temperature.
It is also an object of the present invention to provide a sealing member with a predetermined breaking point, and which is resistant to stress corrosion cracking under the effect of the electrolyte.
These and other objects are achieved according to the present invention by providing a galvanic cell having a negative zinc electrode and an alkaline electrolyte with a sealing member made from plastic and having a predetermined breaking point in the form of a bursting membrane or a score, and which is provided with an essentially pore-free, film-like cover layer which is resistant to the electrolyte at least in the area of the predetermined breaking point.
Further discussion regarding the improved galvanic cell of the present invention is provided with reference to the detailed description which is provided below, taken in connection with the following illustrations.

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