APPARATUS AND METHOD FOR ESTIMATING SOC OF BATTERY

An apparatus for estimating a state of charge (SOC) of a battery includes: a sensing unit configured to measure voltage, current and temperature of a battery; and a processor operably coupled to the sensing unit, and the processor performs: setting a first reference voltage based on a first SOC according to a voltage of the battery, which is calculated in advance using the current of the battery measured at every charge/discharge cycle of the battery; calculating a second SOC according to the voltage of the battery using an equivalent circuit model corresponding to the battery; setting a voltage region of the battery as a first voltage region and a second voltage region based on the first reference voltage; and estimating a SOC of the battery in each of the first voltage region and the second voltage region as any one of the first SOC and the second SOC.