APPARATUS AND METHOD FOR ANALYZING IMPEDANCE CHARACTERISTICS OF BATTERY, AND ENERGY STORAGE SYSTEM

An apparatus for analyzing impedance characteristics of a battery includes: a switch configured to allow or block a current flowing along a path for supplying a charging current to a battery or extracting a discharging current from the battery; and a processor configured to derive impedance characteristics of the battery using a method of generating an excitation current for deriving the impedance characteristics of the battery from the charging current by controlling an on/off operation of the switch while the charging current for charging the battery is supplied through the path.