BATTERY MANAGEMENT DEVICE AND OPERATING METHOD THEREOF

A battery management apparatus according to an embodiment disclosed in this document may include an information acquisition unit that acquires a voltage of each of a plurality of battery cells, and a controller that calculates a resistance of each of the plurality of battery cells corresponding to a SOC class including at least one SOC based on the voltage of each of the plurality of battery cells when the plurality of battery cells are charged based on a preset charging protocol and diagnoses each of the plurality of battery cells based on the resistance of each of the plurality of battery cells corresponding to the SOC class.