APPARATUS AND METHOD FOR DETECTING LOW-VOLTAGE DEFECTIVE BATTERY CELL

A battery pack in accordance with an exemplary embodiment may include a battery management system (BMS) controlling the battery pack. Here, the BMS includes an internal resistance value calculation module calculating an internal resistance value for each battery cell directly after the battery pack is charged or discharged for a predetermined time, a maximum internal resistance valued battery cell detection module detecting a battery cell having a biggest internal resistance value of the calculated internal resistance values, and a defective battery cell determination module determining a defective battery cell on the basis of a detected number as the battery cell having the biggest internal resistance value for each battery cell.