METHOD AND APPARATUS FOR DIAGNOSING BATTERY CELL

Discussed are a method and an apparatus for diagnosing a battery cell. The method may include applying, by the apparatus for diagnosing the battery cell, an activation waveform having a predetermined frequency to the battery cell in an activation process, and performing an electrochemical impedance spectroscopy (EIS) measurement in a charging section of the activation process. The method may further include, based on the EIS measurement, calculating a slope of a reactance of the battery cell in a voltage section of a predetermined range, and diagnosing the battery cell based on the slope.