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Working principle of BMS lithium-ion battery protection board:

The reason why lithium-ion batteries need protection is determined by their own characteristics. Due to the material of the lithium-ion battery itself, it cannot be overcharged, discharged, overcurrent, short circuited, or charged or discharged at ultra-high temperatures. Therefore, lithium-ion battery components always appear with a delicate protective plate and a current protector.

The bMS protection function of lithium-ion batteries is usually achieved by the collaboration of protection circuit boards and PTC and other current devices. The protection board is composed of electronic circuits, which accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at all times in an environment of -40 ℃ to+85 ℃, and timely control the on-off of the current circuit; PTC prevents severe damage to the battery in high-temperature environments.

The bMS protection board for ordinary lithium-ion batteries usually includes control ICs, MOS switches, resistors, capacitors, and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to conduct under all normal conditions, making the battery cell and the external circuit conduct. When the battery cell voltage or circuit current exceeds the specified value, it immediately controls the MOS switch to turn off, protecting the safety of the battery cell.

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