Unplug the connection between the high-voltage components and the high-voltage electricity one by one, and measure the insulation resistance of the high-voltage matching box and the chassis. When a load is unplugged and the resistance returns to normal, it can be determined that the load has an insulation problem. If no high-voltage components with insulation problems are detected, repeat the testing process until all high-voltage components are checked.
Voltage/Current Detection and Troubleshooting
The voltage and current of the power battery will change with the running state of the vehicle, the operating environment and the driver’s control state. It will lead to over-temperature problems, which will affect the service life of the battery, damage the power components, and affect the safety of the high-voltage system.
In order to ensure the safety of electrical appliances, power battery packs, and drivers and passengers in the high-voltage system of the vehicle when the voltage/current of the power battery is abnormal, it is necessary to design a voltage detection and single-current detection circuit to conduct real-time monitoring of the working voltage and current of the high-voltage circuit system. Accurate detection, when an abnormality is detected, the high-voltage management system BMS needs to cut off the high-voltage circuit in time and issue an audible and visual alarm to the driver.