Apparatus and method for controlling step charging of secondary battery

An apparatus for controlling step charging of a secondary battery, comprising:

• a voltage measuring unit including a voltage sensor, a current measuring unit including a current sensor, and a temperature measuring unit including a temperature sensor configured to respectively measure a voltage, a current, and a temperature of the secondary battery;
• and
• a charging control unit including a processor and operably coupled to the voltage measuring unit, the current measuring unit, and the temperature measuring unit,
• wherein the charging control unit is configured to execute control logics including:
• a control logic to estimate a state of charge (SOC) based on at least one of the measured voltage value, the measured current value, and the measured temperature value;
• a control logic to correct the estimated SOC according to a correction factor determined based on a polarization voltage of the secondary battery;
• a control logic to determine a magnitude of a charging current based on the corrected SOC and the measured temperature value;
• and
• a control logic to provide information on the determined magnitude of the charging current to a charging device.