Pure electric vehicle power battery insulating resistance on-line detection circuit

The utility model discloses a pure electric vehicle power battery insulating resistance on-line detection circuit. The pure electric vehicles power battery insulating resistance on-line detection circuit is mainly composed of a voltage division unit and a voltage acquisition unit, the above voltage division unit comprises a resistor R1 and the switches K1 and K2, and the above voltage acquisition unit comprises the switches K3 and K4, a voltage follower and an inverse proportion amplifier. The above insulating resistance detection circuit is added between a power battery of an electric vehicle and a power battery management system controller, and is simple in structure because of not needing an auxiliary voltage division resistor, thereby not existing the energy consumption of the auxiliary voltage division resistor during the power battery insulating resistance detection process.