Matsushita Electric Industrial Co., Ltd.

Naoko Souma

Fumio Daio

Hajime Konishi

Takashi Yokoyama

Yoshinobu Morita

Kenichi Nakatsu

Norimasa Takahashi

A flat-type cell comprising cup shaped positive and negative electrode cases, each having a cylindrical part with the negative electrode case being placed inside the positive electrode case with their cylindrical parts facing each other with a gasket in between, wherein the cylindrical part of the negative electrode case has its open edge folded outwardly to form U shaped section and its cylindrical part expanded outwardly, so that the inner volume of the negative electrode case is enlarged and the electrical capacity is improved with decreased self-discharge and electrolyte leakage.

Flat-type cell

There is provided a method of making uniform porous fluoroplastic membranes having a high Gurley number and a narrow permeability range, this method comprising closing the pores on part of the surface of a fluoroplastic film by compression or by application of an ink. Also provided is a button type air depolarized battery having stable, long-term discharge characteristics over a wide range of load, by employing therein the foregoing porous fluoroplastic membrane having a high Gurley number. The battery structure is similar to that of a conventional battery, but is equipped with the foregoing improved fluoroplastic membrane.

Process of making porous fluoroplastics membrane for an air depolarized

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Katano, Japan

Naoko Souma