CELL BALANCING METHOD AND BATTERY SYSTEM WITH CELL BALANCING

The present invention relates to a cell balancing method and a battery system providing the method. The battery system according to one example of the present invention includes: a battery including a plurality of battery cells; a cell monitoring integrated circuit (IC) that measures a cell voltage of each of the plurality of battery cells; a current sensor that measures a battery current flowing in the battery; and a main control circuit that estimates a cell state of charge (SOC) of each of the plurality of battery cells based on the cell voltage and the battery current, extracts a minimum cell SOC among cell SOCs of the plurality of battery cells, determines a balancing reference value corresponding to the minimum cell SOC, and determines a need for cell balancing for each of the plurality of battery cells based on the balancing reference value.