Hitachi Maxell, Limited

Koji Koide

Minajuro Ushijima

Shinichi Iwamoto

Shoichiro Tateishi

Makoto Urade

Yasuyoshi Taniguchi

Tsugiyasu Iwamaru

The present invention discloses an alkaline dry cell with a high capacity having a superior liquid leak resistant property. In this alkaline dry cell, the thickness of the trunk portion of an external can is made thinner than 0.18 mm, and the thickness of the sealing edge portion of the external can is set to not less than 1.4 times the thickness of trunk portion. An anode terminal plate is used as a supporting member for a sealing member. Over the entire outer circumferential portion of the anode terminal plate is placed a curved portion having an average curvature radius of not more than 1 mm, which shows a virtually C-letter shape or an arc shape in its cross-section obtained by cutting the anode terminal plate through its center in the thickness direction.

Alkaline dry cell

The present invention discloses an alkaline dry cell containing a cathode and an anode, a separator and an electrolyte solution that are housed inside an external can, and a resin sealing member and a supporting member for supporting the sealing member with an inner circumferential side that are attached to an opening edge of the external can, wherein the opening edge of the external can is sealed by tightening the resin sealing member with the external can and the supporting member.

A method of preparing a positive electrode active composition for use in an alkaline manganese cell comprising a negative electrode, a negative electrode active material, a positive electrode and a positive electrode composition inclusive of manganese dioxide as a positive electrode active material, an electrically conductive filler and low molecular weight polytetrafluoroethylene, wherein an amount of the low molecular weight polytetrafluoroethylene powder ranges from 0.1% to 0.3% by weight based on the total weight of manganese dioxide and the electrically conductive filler, which cell has small internal resistance and good discharge performance.

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Ibaraki, Japan

Koji Koide