APPARATUS AND METHOD FOR DIAGNOSING BATTERY

Disclosed is an apparatus for diagnosing a battery, which includes a profile obtaining unit configured to obtain a charging profile representing a voltage change of a battery in a charging process; and a control unit configured to calculate a voltage change amount of the battery at a point in time when charging starts in the charging profile, calculate a target resistance of the battery based on the calculated voltage change amount, and diagnose a state of the battery by comparing the target resistance with a first resistance profile in which a target resistance of the battery calculated in a previous charging cycle is stored.