Rollback inner cover

Details Rollback inner cover Rollback inner cover

1990-04-13

1991-09-24

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

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

429175, 429181, H01M 204, H01M 206

Patent

active

050513230

ABSTRACT:
A cover for a galvanic cell having a reverse curved peripheral edge and a substantially centrally disposed upstanding wall bounding an aperture. A sealing member is positioned below the cover and has a tubular hub which projects through the aperture in the cover and a skirt that electrically insulates the edge of the cover. An electrically conductive fastener is positioned in the tubular hub on the sealing member which tends to cause the edge of the tubular hub to roll or "mushroom" when the electrically conductive fastener is peened or clinched in place. The rolled tubular hub tightly locks the fastener and the cover together while the edge of the cover presses against the inner wall of the container holding the components of the galvanic cell. The pressure tends to slightly bow the cover enabling it to stay in a tightly sealed condition under both physical and thermal stress. A galvanic cell incorporating the cover is also disclosed.

REFERENCES:
patent: 3069489 (1962-12-01), Carmichael et al.
patent: 3318737 (1967-05-01), Watanabe et al.
patent: 3660168 (1972-05-01), Ralston et al.
patent: 4869978 (1989-09-01), Kubo et al.

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