Panasonic Corporation

Mao Yamashita

Masaharu Miyahisa

Seiichi Kato

A positive electrodeincludes a positive electrode current collector leadconnected to a core exposed partformed at a longitudinal center of a current collector core. A negative electrodeincludes a double-coated partincluding an active material layerand a porous protective filmformed on each surface of a current collector core, a core exposed part, and a single-coated partwhich is located between the double-coated partand the core exposed part, and includes the active material layerand the porous protective filmformed only on one of the surfaces of the current collector core. A plurality of groovesare formed in each surface of the double-coated part, while the groovesare not formed in the single-coated part. A negative electrode current collector leadis connected to the core exposed part. The negative electrodeis wound in such a manner that the core exposed partconstitutes a last wound end.

Electrode group for nonaqueous battery and method for producing the same, and cylindrical nonaqueous secondary battery and method for producing the same

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Osaka, Japan

Mao Yamashita