Patent ID: 8421466

Claim:
An apparatus for sensing a leakage current of a battery, comprising: a floating capacitor charged with a voltage detected from a cathode terminal or an anode terminal of a battery; a cathode terminal selection switching unit for selecting a voltage detection path for the cathode terminal and charging the floating capacitor with a detection voltage of the cathode terminal; an anode terminal selection switching unit for selecting a voltage detection path for the anode terminal and charging the floating capacitor with a detection voltage of the anode terminal; a DC (Direct Current) voltage applying unit for applying a DC voltage through the selected voltage detection path for the anode terminal; a voltage measuring unit for measuring the detection voltage of the cathode terminal or the anode terminal, charged to the floating capacitor; and a leakage current determining unit for determining the occurrence of a leakage current based on the detection voltages of the cathode terminal and the anode terminal, measured by the voltage measuring unit.