Many people do not understand the purpose of the lithium-ion battery protection board. The lithium-ion battery protection board, as the name suggests, is used to protect the lithium-ion battery pack. It is output short circuit protection.

    The lithium-ion battery protection board is mainly used to protect the charging and discharging of the lithium-ion battery pack. When fully charged, it can effectively ensure that the voltage difference between each single lithium-ion battery is less than the set value, realize the balanced charging of each single battery of the lithium-ion battery pack, and effectively improve the lithium-ion battery composed of series and parallel. The charging effect of the group.

    At the same time, the protection board can also detect the over-voltage, under-voltage, over-current, short-circuit, and over-temperature states of each single lithium-ion battery in the lithium-ion battery pack. After detecting these states, the protection board can adjust and warn in time to protect The plate can effectively protect and prolong the service life of the lithium-ion battery pack.

    The purpose of undervoltage protection is to prevent damage to the individual lithium-ion cells in a lithium-ion battery pack due to overdischarge during discharge.

The detection method of the protection board is good or bad:

1. Detection circuit

    The functions of the protection boards configured by the lithium-ion battery packs produced by different manufacturers are not necessarily the same. Some protection boards are designed with thermistors to protect the lithium-ion battery pack from overheating.

    The thermistor on the protection board only supplies a temperature sensor to the external circuit. If the circuit of the protection board is not in good contact, the lithium-ion battery is easily damaged. Therefore, checking the circuit of the protection board is an important first step for us to detect the protection board.

2. Cable

    Use a multimeter to confirm the correctness of the cable wiring. Use the black test pen of the multimeter to press the B- line terminal and the red test pen of the multimeter to press the B1 line terminal to obtain the voltage of the first string of batteries. All series-parallel cells in a lithium-ion battery pack are measured in this way.

    If the wiring is correct, and the power difference of all battery strings is lower than a certain value, it means that the protection board is used to ensure the consistency of all batteries in the lithium-ion battery pack.

3. Measure the voltage

    After measuring the voltage of the lithium-ion battery pack to confirm that it is normal, plug the cable into the protection board, and measure the resistance between the ports on both sides of the protection board. If the resistance is zero, it means that the lithium-ion battery pack is unobstructed before, and the protection board is very Good for use.