Method of making a rectangular nickel-metal hydride secondary ce

Details Method of making a rectangular nickel-metal hydride secondary ce Method of making a rectangular nickel-metal hydride secondary ce

1994-08-31

1996-02-13

Maples, John S.

Metal working

Method of mechanical manufacture

Electrical device making

29422, 29515, 29731, H01M 204

Patent

active

054908671

ABSTRACT:
A rectangular nickel-metal hydride secondary cell permits improving the air-tightness and-also permits preventing a metal case from being deformed in the step of folding an open end portion of the metal case. The rectangular nickel-metal hydride secondary cell, comprising a rectangular cylindrical metal case having a bottom, an electrode group housed in the metal case, an alkali electrolyte contained in the metal case, a rectangular sealing plate mounted near the open end portion of the metal case; and an insulating gasket interposed in a compressed state between the inner wall near the open end of the metal case and the sealing plate, wherein the metal case comprises a folded portion formed by inwardly folding the open end portion of the metal case and an inwardly projecting stepped portion formed along the inner surface of the metal case below the folded portion, the sealing plate is fixed to the metal case at the portion between the folded portion and the stepped portion of the metal case with the insulating gasket interposed therebetween, the folded portion at a corner portion of the open end portion of the metal case has an angle of 80.degree. to 100.degree..

REFERENCES:
patent: 3554813 (1971-01-01), Feldhake
patent: 4136443 (1979-01-01), Nabiullin et al.
patent: 4656736 (1987-04-01), Volkhin et al.
patent: 5150602 (1992-09-01), Payne et al.

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