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Working Principle of BMS Lithium-Ion Battery Protection Board

Working Principle of BMS Lithium-Ion Battery Protection Board

The reason why lithium-ion batteries need to be protected is determined by its own characteristics. Since the material of the lithium-ion battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, or charged and discharged at ultra-high temperatures, the lithium-ion battery component will always appear with a delicate protective board and a current fuse.

The bMS protection function of lithium-ion batteries is usually completed by a protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits and can accurately monitor the voltage and charge and discharge of the battery core at all times in an environment of -40°C to +85°C. The current in the loop can be controlled in a timely manner to make the current loop on and off; PTC can prevent severe damage to the battery in high temperature environments.

Lithium-ion battery bMS protection boards usually include control IC, MOS switches, resistors, capacitors and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to turn on when everything is normal, so that the battery core is connected to the external circuit. When the battery core voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the battery’ safety.

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