CHARGING CONTROL METHOD OF BATTERY PACK AND BATTERY SYSTEM USING THE SAME

A battery system may include: a battery pack including a plurality of battery cells; and a battery management system configured to derive a charging rate based on a charging target SOC (State of Charge) for the battery pack and the temperature of the battery pack, and compensate for the charging rate through PID control based on an error voltage between any one of the plurality of cell voltages and an open circuit voltage (OCV) corresponding to the charging target SOC to generate a compensation charging rate.