Apparatus and method for discharging battery

A battery discharging apparatus, comprising:

• a battery module including a plurality of battery cells;
• discharging elements which are connected to the plurality of battery cells, respectively through switches to discharge a voltage of the plurality of battery cells;
• a detecting unit which detects an abnormal state of a vehicle;
• wherein the abnormal state of the vehicle comprises a vehicle damage;
• a control unit which is connected to the battery module to monitor a charged/discharged status of the plurality of battery cells of the battery module and controls the switches to balance the plurality of battery cells;
• and
• a plurality of filters connected between a corresponding battery cell of the plurality of battery cells and the control unit to remove a noise of a signal from the corresponding battery cell,
• wherein each of the plurality of filters includes a resistor and a capacitor in series,
• wherein when the control unit receives a vehicle abnormal state signal from the detecting unit, the control unit controls the switches to be turned on/off at predetermined different duty ratios according to a temperature of the discharging elements to discharge the corresponding battery cells, and
• wherein the control unit controls the switches at a duty ratio in which an on:off ratio is 3:7 to minimize a rapid temperature rise of at least one of the plurality of battery cells.