Patent ID: 11923710
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A battery management apparatus, comprising:
a sensor circuit configured to detect a current, a voltage, and a temperature of a battery; and
a controller configured to:
generate a data set comprising:
a current value indicating the detected current;
a voltage value indicating the detected voltage; and
a temperature value indicating the detected temperature;

determine a first candidate value for a state of charge (SOC) of the battery, based on the current value using ampere counting;
determine a Kalman gain and a second candidate value for the SOC, based on the data set, using an extended Kalman filter;
determine the SOC to be equal to the first candidate value if a difference value between the first candidate value and the second candidate value is larger than a threshold value; and
set a ratio of a second process noise to a first process noise in the extended Kalman filter to be equal to a predetermined reference ratio if:
a first component of the Kalman gain is equal to or higher than a predetermined first lower limit; and
a second component of the Kalman gain is equal to or higher than a predetermined second lower limit,

wherein the first process noise is associated with reliability of the ampere counting, and
wherein the second process noise is associated with reliability of an equivalent circuit model of the battery.