SECONDARY BATTERY AND COLLECTOR FOR SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a highly reliable secondary battery and a collector for a secondary battery.

SOLUTION: A square shape nonaqueous electrolyte secondary battery includes: a flat wound electrode body 11 comprising a positive electrode plate and a negative electrode plate wound via a separator; a positive electrode collector connected to a positive electrode core exposed portion provided on one end side of the wound electrode body 11; and a negative electrode collector 181connected to a negative electrode core exposed portion 15 provided on the other end side of the wound electrode body 11. At least one of the positive electrode collector and the negative electrode collector 181has a first region connected to the positive electrode core exposed portion or the negative electrode core exposed portion 15 by resistance welding, and a bent portion is formed on a center side in the wound axis direction of the wound electrode body 11 among the end portions of the first region.

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