Measurement and fault point positioning device of insulation resistance of battery system

The invention discloses a measurement and fault point positioning device of an insulation resistance of a battery system. The device comprises a switching module, a sampling resistor network, a voltage measurement module, and a data operation analysis module. When the insulation resistance is measured, high voltage is introduced into a sampling resistor by the switching module, and then the sampling resistor is sent to the voltage measuring module to be sampled, and finally the operation is carried out by the data operation analysis module, so that the insulation resistance value is obtained; if the low insulation resistance fault occurs, the location of insulation fault in the battery system can be precisely positioned by the device.