Patent ID: 8207741

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 terminal selection switching unit for selecting a voltage detection path for the cathode or anode terminal; a charge switching unit for charging the floating capacitor with a detection voltage of the cathode or anode terminal, detected through the selected voltage detection path; a polarity reverse switching unit for reversing a polarity of the detection voltage of the anode terminal charged to the floating capacitor; and a leakage current determining unit for sensing the detection voltage of the cathode terminal charged to the floating capacitor and the polarity-reversed detection voltage of the anode terminal charged to the floating capacitor to calculate a leakage resistance, and then comparing the calculated leakage resistance with a criterion insulation resistance to determine whether or not a leakage current occurs.