Sanyo Electric Co., Ltd.

Koichi Kusagawa

Kazuhiro Hasegawa

Tomomichi Ueda

Akira Nagasaki

Takanori Kitagawa

A method for manufacturing a nonaqueous electrolyte secondary battery, when an electrode tab is provided at a longitudinal-direction end portion of an electrode located at a winding-start side of an electrode body, the method being capable of sufficiently reducing damage on a separator and the electrode in a process for manufacturing the electrode body. In a manufacturing step of one example of an embodiment, a negative electrode tab is bonded to a longitudinal-direction end portion of a negative electrode to be located at a winding-start side of an electrode body, the negative electrode tab is processed so that a width-direction central portion of the negative electrode tab at least bulges toward a winding-outer side of the electrode body, and while a gap is formed between the negative electrode tab and a winding core, a positive electrode, the negative electrode, and a separator are wound around the winding core.

Method for manufacturing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery including a positive electrode plate including a positive electrode current collector and a positive electrode mixture layer, formed thereon, containing a positive electrode active material; a negative electrode plate including a negative electrode current collector and a negative electrode mixture layer, formed thereon, containing a negative electrode active material; a separator: a nonaqueous electrolyte; an outer can; and a sealing body. The positive electrode and negative electrode plates are wound with the separator there between. The positive electrode active material contains a lithium-nickel composite oxide containing cobalt and aluminum as constituent elements. The negative electrode active material contains graphite and a silicon material. The negative electrode plate includes negative electrode current collector-exposed portions, located at both ends thereof in a longitudinal direction, not covered by the negative electrode mixture layer. The negative electrode current collector-exposed portions are each connected to a negative electrode tab.

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Osaka, Japan

Koichi Kusagawa