Alkaline dry cell

H - Electricity – 01 – M

Patent

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Details

H01M 4/06 (2006.01) H01M 4/66 (2006.01) H01M 4/82 (2006.01)

Patent

CA 2080550

The present invention provides an alkaline dry cell which has a negative electrode comprising zinc alloy powders free of mercury as a negative electrode active material and provided in the center portion of the cell, a positive electrode provided around the outer surface of the negative electrode with a separator provided therebetween and a current collector comprising copper or a copper alloy and inserted in the negative electrode and which is inhibited from generation of hydrogen gas and from leakage of liquid. This alkaline dry cell is characterized in that the surface of the current collector is plated with a metal of high hydrogen overvoltage such as tin, lead, copper, zinc or an alloy of two or more of these metals.

a présente invention porte sur la réalisation d'une pile sèche alcaline constituée, au centre de la pile, d'une électrode négative à base de poudres en alliage de zinc sans mercure comme matière active et d'une électrode positive autour de la surface extérieure de l'électrode négative. Un séparateur isole les deux électrodes l'une de l'autre tandis qu'un collecteur de courant, à base de cuivre ou d'alliage de cuivre et inséré dans l'électrode négative, empêche la production d'hydrogène gazeux et les fuites de liquide. Cette pile sèche alcaline est caractérisée par le fait que la surface du collecteur de courant est plaquée à l'aide d'un métal à haute surtension d'hydrogène comme de l'étain, du plomb, du zinc ou d'un alliage de deux ou plusieurs de ces métaux.

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