After a short-circuit protection trigger, the core steps to restore the lithium battery protection board to its usable state are: first, thoroughly eliminate the short-circuit fault; second, select the reset method according to the type of lithium battery protection board; and finally, verify its functionality through testing. This process must strictly adhere to safety regulations to avoid secondary faults or safety hazards caused by improper operation.
A thorough investigation of the short-circuit fault is a prerequisite for reset. The battery pack's connection wires, interfaces, and external circuits must be checked to confirm whether there are any damaged wires, accidental contact between positive and negative terminals, or short circuits in components. If the short-circuit problem is not completely resolved, even after a reset, the lithium battery protection board may still trigger protection again, and may even damage the lithium battery protection board or the battery due to continuous high current. For example, if a cell inside the battery pack is short-circuited due to external pressure, and only the external load is disconnected without repairing the cell's short circuit point, the lithium battery protection board will immediately re-disconnect the circuit after a reset.
The reset method for the lithium battery protection board must be selected according to its type. Most conventional lithium battery protection boards are automatic reset type. After a short circuit fault is cleared, disconnect the battery from the external load and let it stand for 5 to 15 minutes to allow the internal circuitry of the lithium battery protection board to release the trigger signal and restore conductivity. After standing, the output voltage can be checked by connecting a small test load or using a multimeter. If the test load works normally and the voltage is stable, the reset is successful. If it still does not recover after standing, the standing time can be extended appropriately or the short circuit fault can be rechecked. Some lithium battery protection boards used in industrial equipment or special scenarios use a manual reset mode, which requires pressing the reset button or disconnecting and reconnecting a specific terminal to achieve reset. During operation, ensure the battery is disconnected from power, press the reset button for 1 to 3 seconds with an insulated tool, or disconnect the reset terminal for 5 to 10 seconds and then reconnect it, wait a moment, and then check the output.
After the reset operation is completed, a comprehensive functional test should be performed to ensure that the lithium battery protection board has returned to normal. First, use a multimeter to measure the battery output voltage to confirm that the voltage value is within the normal range for lithium batteries and is stable without fluctuations. For example, a 48V lithium battery has a voltage of approximately 54.6V when fully charged and approximately 40V at the end of its discharge. If the voltage is abnormal, the lithium battery protection board or the battery itself needs to be re-inspected. Next, connect the compatible load and observe whether the load functions normally and whether there are any sudden power outages or voltage drops during operation. If the load operates stably, the reset is successful; if any abnormality occurs, the load must be immediately disconnected, and the lithium battery protection board and battery re-inspected. Finally, ensuring safety, verify other protection functions of the lithium battery protection board, such as overcharge and over-discharge protection, to prevent short circuits from causing other functions to fail. For example, observe whether the charging process is stable during normal charging and whether it automatically stops charging when fully charged.
Throughout the entire reset process, safety procedures must be strictly followed. Before operation, disconnect the lithium battery from all external loads to ensure the battery is in an independent, unloaded state, preventing circuit abnormalities caused by the presence of a load during the reset process. Operators must wear insulated gloves, use insulated tools, and choose a dry, well-ventilated environment free of flammable and explosive materials for operation. Avoid working in damp or cluttered environments. If the battery casing or connecting wires are damaged or leaking, do not attempt to reset it. Address the battery damage first to prevent electric shock, fire, or other safety hazards.
Special caution is required: forcibly resetting the lithium battery protection board without clearing a short circuit may completely damage the board and could even cause the battery to catch fire or explode. Also, do not use sharp tools to forcefully press the reset button or pry open the terminals to avoid damaging the lithium battery protection board components.
