APPARATUS AND METHOD FOR DIAGNOSING STATE OF BATTERY

An apparatus for diagnosing a state of a battery according to an embodiment of the present disclosure includes a voltage measuring unit configured to measure a voltage of a battery and measure a target voltage for the battery when the measured voltage reaches a preset first reference voltage; a resistance measuring unit configured to measure a target resistance of the battery when the measured voltage reaches a preset second reference voltage; and a control unit configured to determine a voltage increase/decrease pattern for the target voltage based on a voltage profile in which the target voltage is stored, determine a resistance increase/decrease pattern for the target resistance based on a resistance profile in which the target resistance is stored, and diagnose a state of the battery from the voltage increase/decrease pattern and the resistance increase/decrease pattern according to a preset diagnostic rule.