Spirally wound battery

Details Spirally wound battery Spirally wound battery

2011-07-12

2011-07-12

Alejandro, Raymond (Department: 1727)

Chemistry: electrical current producing apparatus, product, and

Plural concentric or single coiled electrode

C429S233000, C429S245000, C429S211000

Reexamination Certificate

active

07976973

ABSTRACT:
A battery includes a spirally wound electrode body in which a cathode and an anode are layered with a separator in between and spirally wound. The spirally wound electrode body is attached with at least one lead on the spirally-winding center side. The cathode has a cathode current collector having a pair of opposed faces, an outer-face cathode active material layer provided on the spirally-winding outer face side of the cathode current collector, and an inner-face cathode active material layer provided on the spirally-winding inner face side thereof. A thickness of the inner-face cathode active material layer is smaller than a thickness of the outer-face cathode active material layer. An outer face active material region provided with only the outer-face cathode active material layer is formed to be overlapped with the lead on the spirally-winding center side of the cathode.

REFERENCES:
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patent: 2003-187871 (2003-07-01), None
patent: 2006-024464 (2006-01-01), None
Japanese Office Action issued on Apr. 15, 2008.

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