Patent ID: 9146280
Filing Date: 2015-09-29
Classification: G01R

Abstract:
1. A method for estimating a capacity of a battery, comprising: providing a look-up table storing data pairs each having a look-up voltage and a look-up capacity of the battery; initializing the battery to reach an initialization state which serves as a starting point for a discharging process; discharging the battery, from the initialization state, by a first amount of charge to reach a first state; calculating an actual capacity of the battery based on a measured amount of charge discharged from the initialization state to the first state; measuring an open-circuit voltage at the first state; obtaining a first look-up capacity of the battery from the look-up table according to the open-circuit voltage measured at the first state; calculating a difference by subtracting the first look-up capacity from the actual capacity; calculating an absolute value of the difference; and correcting the look-up table using a first correction method when the difference is less than zero and using a second correction method when the difference is greater than zero, the second correction method being different from the first correction method, wherein the first correction method comprises: