Method of forming a terminal pip protrusion on the casing of...

H - Electricity – 01 – M

Patent

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Details

H01M 6/06 (2006.01) H01M 2/30 (2006.01) H01M 10/28 (2006.01) H01M 2/02 (2006.01) H01M 6/00 (2006.01) H01M 6/08 (2006.01)

Patent

CA 2337073

A method comprises forming a pip protrusion (15) at the closed end (11) of a cylindrical casing (10) of an electrochemical cell, preferably an alkaline cell having an anode comprising zinc, a cathode comprising manganese dioxide, and an alkaline electrolyte. The pip protrusion (15) is formed at the closed end (11) of the casing (10) so that the pip protrusion (15) becomes an integral part of the casing (10). Cathode material (20) is inserted into the casing (10) through its open end (12) and then an elongated plunger (34) having a diameter less than the inside diameter of the casing (10) is forced into the cathode material (20) while means (47) for preventing the cathode material (20) from rising more than a predetermined level with the casing (10) is provided. The force of the plunger (34) causes the cathode material (20) to become compacted while simultaneously causing a pip protrusion (15) to form at the closed end (11) of the casing (10).

La présente invention concerne un procédé permettant de former la pointe de contact (16) de l'extrémité fermée (11) de l'enveloppe cylindrique (10) d'une pile électrochimique, de préférence une pile alcaline dont l'anode comprend du zinc, dont la cathode comprend du dioxyde de manganèse, et dont l'électrolyte est alcalin. La pointe de contact (15) est formée à l'extrémité fermée (11) de l'enveloppe (10) de façon que la pointe de contact (15) constitue une partie intégrante de l'enveloppe (10). A cet effet, on introduit du matériau de cathode (20) dans l'enveloppe (10) par l'extrémité ouverte (12), puis on prend un piston de forme allongée (34) d'un diamètre inférieur au diamètre intérieur de l'enveloppe (10) et on le fait pénétrer de force dans le matériau de cathode (20) pendant qu'on met en oeuvre un moyen (47) destiné à empêcher au matériau de cathode (20) de remonter au-dessus d'un niveau défini avec l'enveloppe (20). La force exercée par le piston (34) provoque le compactage du matériau de cathode (20) tout en provoquant la formation de la pointe de contact (15) à l'extrémité fermée (11) de l'enveloppe (10).

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