Hermetically sealed primary electrochemical cell and a method fo

Details Hermetically sealed primary electrochemical cell and a method fo Hermetically sealed primary electrochemical cell and a method fo

1976-01-08

1977-09-13

Lefevour, C. F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Cell enclosure structure, e.g., housing, casing, container,...

429174, 429180, H01M 202

Patent

active

040484017

ABSTRACT:
A hermetically sealed primary electrochemical cell is described together with a method for its production which is especially useful with electrochemical systems which include an electrolytic solution having a volatile solvent material. The hermetic seal is achieved by welding a glass-to-metal seal within a single opening in the outer casing of the primary electrochemical cell. In order to avoid volatilization of the solvent material during the welding process, a temporary seal is formed within the outer cell casing immediately above the elements forming the electrochemical system so the solvent material is insulated from the heat and any volatilized solvent material is effectively prevented from escaping during the time required to complete the weld. In a preferred form of the method, the entire assembly is chilled prior to the welding step to further reduce volatilization of the solvent material.

REFERENCES:
patent: 3064065 (1962-11-01), Belove
patent: 3237060 (1966-02-01), Ross
patent: 3420714 (1969-01-01), Knight
patent: 3544383 (1970-12-01), Oltman
patent: 3804671 (1974-04-01), Rosansky
patent: 3843413 (1974-10-01), Schmidt
patent: 3874929 (1975-04-01), Greatback

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