LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To assure safety of a battery by itself against physical shocks from the inside or outside of the battery without sacrificing basic performance required of batteries for high power.

SOLUTION: The lithium ion secondary battery includes a group of electrodes for lithium ion secondary battery in which a negative electrode plate 406 forming a negative electrode mixture layer 404 on both surfaces of a sheet-shaped negative electrode current collector 401 whose principal component is copper, a positive electrode plate 407 forming a positive electrode mixture layer 405 on both surfaces of a sheet-shaped positive electrode current collector 402 whose principal component is aluminum and a separator 403 maintaining electrolytic solution are wound or laminated. The thickness of the positive electrode current collector 402 is smaller than that of negative electrode current collector 401.

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