Patent ID: 8912762

Claim:
A charging method for a non-aqueous electrolyte secondary battery, comprising repeating f times a charging sequence of a constant current charge and a constant voltage charge, subsequent to the constant current charge, where f is an integer of 2 or more, wherein: an n th charging sequence comprises charging the secondary battery at a current Ic(n) until a voltage of the secondary battery increases to Ec(n), and subsequently charging the secondary battery at the voltage Ec(n) until the current decreases from Ic(n) to Ic(n+1), and an (n+1) th charging sequence comprises charging the secondary battery at the current Ic(n+1) until the voltage of the secondary battery increases to Ec(n+1), and subsequently charging the secondary battery at the voltage Ec(n+1) until the current decreases from Ic(n+1) to Ic(n+2), where n is an integer of 1 or more and f-1 or less.