Patent ID: 11876397
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 3:
4. The apparatus for controlling step charging of the secondary battery according to claim 1,
wherein the charging control unit is configured to determine the polarization voltage according to an equation below:

dVpol[k]=Vcell[k]−VOCV[k]−I[k]R0 

where k is a time index, dVpol[k] is a polarization voltage, Vcell[k] is a voltage estimated by an extended Kalman filter or a measured voltage, VOCV[k] is an OCV, R0 is an internal resistance of the secondary battery, and I[k] is a charging current of the secondary battery.