The reason why lithium batteries need protection is that their own characteristics determine that they cannot be overcharged, over-discharged, overcurrent, short-circuited, and ultra-high temperature charging and discharging. Therefore, lithium batteries always contain a delicate protection board and a current fuse.

　　The protection function of the lithium battery is usually completed by the protection circuit board and electronic devices such as PTC. It can accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at all times, and control the on and off of the current circuit in time; PTC prevents the battery in a high temperature environment Bad damage occurred.

　　The protection board usually includes protection IC, MOS switch, resistor, capacitor and auxiliary devices FUSE, PTC, NTC, ID, memory and so on.

　　The protection IC controls the MOS switch to turn on under all normal conditions to make the cell and the external circuit conduct, and when the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the safety of the cell.

　　After the protection board is over-current or short-circuit protected, it may need to be charged or completely disconnected to activate it to release the protection state of the protection board.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　To ensure the safety of lithium batteries, each lithium battery needs a protection board.