Patent ID: 9541608
Date: 2017-01-10
CPC Classifications: G01R,H01M,Y02E

Claim:
1. An apparatus for measuring an insulation resistance, the apparatus comprising: a first insulation resistance measurement unit and a second insulation resistance measurement unit connected to a cathode terminal and an anode terminal of a battery, respectively; a first switch and a second switch to form different first and second circuits by selectively connecting the first insulation resistance measurement unit and the second insulation resistance measurement unit to the cathode terminal and the anode terminal, respectively; a voltage detection unit to sense a first insulation detection voltage and a second insulation detection voltage applied to the first insulation resistance measurement unit and the second insulation resistance measurement unit; and a control unit to calculate, via simultaneous circuit equations derived from the first circuit and the second circuit, a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value from the first insulation detection voltage and the second insulation detection voltage, wherein the second insulation resistance measurement unit further includes a direct current (DC) power applying unit, and wherein the control unit calculates the following Equations including the simultaneous circuit equations for calculating the cathode terminal-side insulation resistance value and the anode terminal-side insulation resistance value: where V