[Introduction] Maintaining voltage consistency between individual cells is critical for the safety, longevity, and performance of any lithium battery system. Excessive differential voltage or abnormal fluctuations can lead to premature system shutdowns or reduced capacity. This guide provides a professional step-by-step procedure for inspecting and repairing these issues.
[Safety Warning] Before proceeding, ensure the battery system is powered off and disconnected. Use insulated tools and wear appropriate personal protective equipment (PPE).
Begin by removing the 16 screws that secure the top cover of the battery unit. Ensure all screws are stored safely to avoid loss during reassembly.
Carefully lift the top cover and place it in the direction shown in the provided technical photos. Important: Do not pull or strain the internal cables, specifically the switch wiring and the LCD screen cables, as these are sensitive components.
Identify the fiberglass protective board. Remove the two screws securing the board (indicated by the red circles in the technical diagram).
Lift the fiberglass board to access the cell terminals. Inspect the three sampling wires (indicated by the red arrows) for any of the following defects:
- Broken or disconnected wires.
- Missing or "cold" solder joints.
- Loose screws on the terminals. Action: If any defect is found, reconnect or re-solder the wires securely.
If the sampling wires are in good condition but the issue persists, use a multimeter to measure the voltage of each individual cell.
- Comparison: Compare the voltage of the suspected cell with the others in the pack.
- Threshold: If the voltage difference is greater than 0.1V, the cell is considered abnormal and must be replaced to restore pack balance.
Once the inspection or repair is complete, carefully replace the fiberglass board and top cover, ensuring no wires are pinched. Reinstall all 16 screws securely.
Regular monitoring through your Smart BMS can help identify these issues early. If a manual inspection reveals a cell variance exceeding 0.1V, replacement is the recommended path to ensure the overall health of your energy storage system.
Need further technical assistance? Contact our Engineering Support Team.
