Flat-type cell
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshinobu Morita, Fumio Daio, Norimasa Takahashi, Kenichi Nakatsu, Naoko Souma
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Abstract
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.
Claims18
A flat-type cell comprising:
- a cup-shaped negative electrode case and a cup-shaped positive electrode case with an insulating gasket in between forming a sealed housing by bending an open edge of said positive electrode case inwardly to, said positive electrode case and said negative electrode case separated by a separator with an electrolyte held between said electrode cases,
- wherein, said negative electrode case has an opening edge folded outwardly to form U shaped section, with a cylindrical part expanded outwardly to have an inner diameter larger than the inner diameter of the folded part.
A flat-type cell comprising:
- a cup-shaped negative electrode case and a cup-shaped positive electrode case together with an insulating gasket in between forming a sealed housing by bending the open edge of said positive electrode case inwardly;
- a negative electrode in the negative electrode case comprising zinc powder holding alkaline electrolyte;
- a sheet of diffusion paper, hydrophobic membrane, and an air-electrode stacked on the bottom of said positive electrode case, with a separator to separate the both electrodes;
- wherein said negative electrode case has its open edge folded outwardly to form U shaped section, with a cylindrical part expanded outwardly to have its inner diameter larger than the inner diameter of the folded part.
Dependencies are inferred from the claim text.