Method and system for estimating state of charge of battery
AssigneeLG Chem, Ltd.
InventorsKyung Jik KIM, Ho Sang KWON, Jae Chan LEE
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for estimating a state of charge (SOC) of a secondary battery using a full charge capacity (FCC) of the battery, the method including (S1) measuring voltage and current of the battery, (S2) calculating the FCC using a voltage change and a current integral of the battery during a specific time, (S3) estimating a time remaining until the battery is fully discharged using the calculated FCC and the measured voltage and current to calculate a self-discharge rate, (S4) calculating a capacity deterioration rate of each charge cycle of the battery, and (S5) applying the calculated self-discharge rate and the calculated capacity deterioration rate to estimate the SOC of the battery.
Claims10
A method for estimating a state of charge (SOC) of a secondary battery using a full charge capacity (FCC) of the battery, the method comprising:
- (S 1) measuring voltage and current of the battery;
- (S2) calculating the FCC using a voltage change and a current integral of the battery during a specific time;
- (S3) estimating a time remaining until the battery is fully discharged using the calculated FCC and the measured voltage and current to calculate a self-discharge rate;
- (S4) calculating a capacity deterioration rate of each charge cycle of the battery;
- and
- (S5) correcting the FCC using the calculated self-discharge rate and the calculated capacity deterioration rate to estimate the SOC of the battery.
Dependencies are inferred from the claim text.