Analysis of common faults in lithium ion battery BMS (2)

　　8. Battery current data error

　　possible reason

　　The Hall signal cable plug is loose, the Hall sensor is damaged, and the acquisition module is damaged.

　　Troubleshooting

　　Unplug the current Hall sensor signal line again; check whether the Hall sensor power supply is normal and whether the signal output is normal; replace the acquisition module.

　　9. The battery temperature difference is too large

　　possible reason

　　The cooling fan plug is loose and the cooling fan has failed.

　　Troubleshooting

　　Unplug the fan plug cords again; power on the fans separately and check whether the fans are working properly.

　　10. The battery temperature is too high or too low

　　possible reason

　　The cooling fan plug is loose, the cooling fan fails, and the temperature probe is damaged.

　　Troubleshooting

　　Unplug the fan plug wires again; power on the fan to check whether the fan is normal; check whether the actual temperature of the battery is too high or too low; measure the internal resistance of the temperature probe.

　　11. System error report after relay operation

　　possible reason

　　The relay auxiliary contacts are disconnected, and the relay contacts are stuck

　　Troubleshooting

　　Re-unplug wiring harness; use a multimeter to measure whether the on-off state of the auxiliary contact is correct.

　　12. Do not charge with a charger

　　possible reason

　　Abnormal communication between charger and BMS

　　Troubleshooting

　　Replace the charger or BMS, confirm whether the BMS is faulty or the charger is faulty; check whether the matching resistance of the BMS charging port is normal.

　　13. The onboard instrument has no BMS data display

　　possible reason

　　The main control module wiring harness connection is abnormal

　　Troubleshooting

　　Check whether the main control module wiring harness is fully connected, whether the low-voltage working voltage of the vehicle is normal, and whether the module is working properly