Sealed type cell manufacturing method

Details Sealed type cell manufacturing method Sealed type cell manufacturing method

H - Electricity

01

M

H01M 2/36 (2006.01) H01M 10/04 (2006.01)

Patent

CA 2713186

A cell assembly (20) is formed by arranging an electrode body and electrolyte in an external case (12) having a through hole (41). A laser is applied to an annular portion (formed by Al or Al-based alloy) surrounding an opening end (41A) of the through hole (41) toward outside the case so as to form a welded base (45). A sealing film (54) is welded to the surface of the welded base directly or via a base film (52) welded in advance, so as to temporarily seal the through hole (41). The cell assembly (20) in the temporarily sealed state is subjected to initial charge and then a hole is opened through the film (54) so as to form a gas discharge passage for communication between inside and outside of the case (12), thereby discharging an excessive gas from the case (12) outside.

L'invention concerne un ensemble pile (20) formé en disposant un corps d'électrode et de l'électrolyte dans une enveloppe externe (12) présentant un trou débouchant (41). Un laser est appliqué à une partie annulaire (formée d'Al ou d'un alliage à base d'Al) entourant une extrémité ouverte (41A) du trou débouchant (41) en direction de l'extérieur de l'enveloppe de façon à former une base soudée (45). Un film d'étanchéité (54) est soudé à la surface de la base soudée, directement ou via un film de base (52) soudé à l'avance, de façon à sceller temporairement le trou débouchant (41). L'ensemble pile (20) à l'état temporairement scellé est soumis à une charge initiale, puis un trou est pratiqué à travers le film (54) de façon à former un passage d'évacuation de gaz destiné à établir une communication entre l'intérieur et l'extérieur de l'enveloppe (12), évacuant ainsi vers l'extérieur un gaz excédentaire provenant de l'enveloppe (12).

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