Sanyo Electric Co., Ltd.

Toyoshige Muto

Masayuki Terasaka

Kazuki Shimozono

Syuichi Yamashita

Masanori Ogi

The present invention provides a sealed batteryincluding an electrode bodyformed by winding a positive electrode plate, a negative electrode plateand a separatorinterposed therebetween so as to have a hollow portionat the center, a tube-shaped center pininserted in the hollow portion, a battery outer cancontaining the electrode body, an external terminalalso serving as a safety valveevacuating gas when a gas pressure in the battery outer canexceeds a predetermined value. A slitis formed on a peripheral surface of the center pin, and a cutout partis formed on at least an end of the center pinat the external terminalside.

Sealed battery

A cadmium negative electrode capable of enhancing a utilization rate of metallic cadmium contained therein as an active material in charged state. In the cadmium negative electrode, a mixture paste of a main active material in form of cadmium oxide or cadmium hydroxide and metallic cadmium powder containing yttrium component is deposited on a metallic active material retention substrate.

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Moriguchi, Japan

Toyoshige Muto