Patent ID: 6892148
Filing Date: 2005-05-10
Classification: G01R,H01M,Y02E

Abstract:
1. A method of determining a present zero-current capacity of a battery independent of the condition of the battery, comprising: (a) determining that the battery is in a zero-current relaxed state; (b) measuring a starting open circuit voltage of the battery; (c) integrating a measurable current flowing for the battery to determine an amount of charge transferred, and then determining that the battery is in a zero-current relaxed state; (d) measuring an ending open circuit voltage of the battery; (e) obtaining a starting depth of discharge corresponding to the starting open circuit voltage and an ending depth of discharge corresponding to the ending open circuit voltage; and (f) determining the present zero-current capacity by dividing the amount of charge transferred during step (c) by a difference between the ending depth of discharge and the starting depth of discharge.