How to repair the fault of the vehicle-related power battery system? The power battery system is the core component of electric vehicles, and its failure may seriously affect the performance, safety and reliability of the vehicle. The following are the repair steps and precautions for common power battery faults:
1. High-voltage bus connection failure
Check the high-voltage wiring harness: Use a multimeter to measure the 12V conductivity at the wiring harness end, check whether the MSD is loose, and re-plug it.
Check the contact of the high-voltage wiring harness: Plug and unplug the high-voltage wiring harness to check whether there is poor contact.
Contact professional maintenance: If the problem is complicated, it is recommended to contact a battery engineer for inspection and maintenance.
2. Power failure detection
Read the fault code: Use a special diagnostic instrument to read the fault code and determine the problem.
Check the power supply fuse: Check whether the power battery low-voltage power supply fuse in the front cabin electrical box is blown.
Check the low-voltage power supply of the power battery: Disconnect the low-voltage control plug-in of the power battery and use a multimeter to measure the power supply voltage.
Check the power cord: Measure whether the power cord is short-circuited or open-circuited.
Check the connection between the low-voltage motor and the vehicle controller: Check whether the negative relay of the power battery is energized to ensure that the connection is normal.
3. Insulation failure
Disconnect the battery: Disconnect the power battery from other components and use a megohmmeter to measure the insulation value of each component.
Priority troubleshooting direction: high-voltage box, motor controller, air-conditioning compressor, PTC and other components.
4. Battery cell problem
Internal short circuit of the battery cell: If the internal short circuit of the battery cell is suspected, the personnel on the vehicle should be notified to escape immediately and contact professional maintenance.
Battery cell leakage: Check whether there is leakage caused by external force damage or manufacturing defects, and replace the battery if necessary.
Battery negative electrode lithium deposition: Avoid charging at low temperatures to prevent lithium deposition at the negative electrode of the battery.
Battery cell bloating: Strictly control the moisture in the battery production process to avoid bloating problems.
5. Other precautions
Professional operation: The maintenance and replacement of power batteries should be performed by professionals to ensure safety and effectiveness.
Regular maintenance: Regularly maintain and inspect the power battery system to detect and solve problems in a timely manner.
Through the above steps, faults in the vehicle-related power battery system can be effectively diagnosed and solved to ensure the safe and efficient operation of electric vehicles.
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