Patent ID: 9246344
Filing Date: 2016-01-26
CPC Classification: H01M,H02J,Y02E

Claim Text:
1. A charging method for one or more non-aqueous electrolyte secondary batteries, the method comprising n steps of constant-current charging processes, said n steps comprising: (1) charging the one or more secondary batteries at a current Ic(k) until a charge voltage per one battery reaches a voltage Ec(k), where k is an integer equal to or greater than 1 and equal to or smaller than n−1 where n≧2; and (2) when the charge voltage per one battery reaches the voltage Ec(k), charging the one or more secondary batteries at a current Ic(k+1) smaller than the current Ic(k) until the charge voltage per one battery reaches a voltage Ec(k+1) higher than the voltage Ec(k), wherein the current Ic(k) and the current Ic(k+1) are determined according to frequency of use or number of charge and discharge cycles of the one or more secondary batteries.