Toshiba Battery Co., Ltd.

Kabushiki Kaisha Toshiba

Toshiba Home Appliances Corporation

Toshiba Consumer Electronics Holdings Corporation

Kazunari Kobayashi

Mutsuhiro Maeda

Yuk Fai Lau

Yukihiro Ito

A virtually lead additive-free but highly reliable and practical anode zinc can for a battery with improved process-ability and corrosion resistance. A manganese dry battery comprising such a zinc can. A manufacturing method for making the zinc can and a battery.

Manganese dry battery containing an anode zinc can made of zinc and bismuth

A method for manufacturing non lead added anode zinc material for manganese dry batteries comprising compounding a zinc alloy by melting zinc, 0.1 mass % or more and 0.7 mass % or less of bismuth and other impurity elements inevitably contained in zinc in a melting furnace; casting the compounded molten zinc alloy to a molded material in the form of a band or in the form of a bar; rolling the molded material in band form to form a zinc alloy sheet; and punching the rolled zinc alloy sheet in a designated thickness into a designated shape.

Method for producing manganese dry cell negative electrode zinc material

Presented is a virtually lead additive-free but highly reliable and practical anode zinc can for battery with improved process-ability and corrosion resistance, and a manganese dry battery made by using such a zinc can. Disclosed is a manufacturing method of a proposed zinc can and a battery along with engineering clues for material evaluation and processing with regard to metallographic aspect.

Zinc can for battery anode

An alkaline dry cell includes an anode inside a cathode. The anode includes a metal anode current collector inside an gel anode, which has zinc alloy powder as an active material. The cathode includes a cathode depolarizing mixture, which has electrolytic manganese dioxide as an active material, in a closed-end metal cathode can. Small amounts of the active materials can be used economically. A theoretical capacity ratio (N,/P,) between the anode and the cathode is in a range of 1.0 to 1.20. A contact area ratio (P,/N,) between an anode-opposed area of the cathode depolarizing mixture and a contact area of the anode current collector against the gel anode is in a range of 1.82 to 8.24. A short charge-up time makes the alkaline dry cell suitable to power the flash of a camera.

Growing community of inventors

Chiba, Japan

Kazunari Kobayashi