Principle analysis of lithium battery protection board

The reason why lithium batteries (rechargeable) need to be protected is determined by their own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited, and ultra-high temperature charging and discharging, the lithium battery package will always appear with a delicate protection board and a current fuse. The protection function of lithium battery is usually completed by a protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the charging and discharging circuit at all times under the environment of -40°C to +85°C. Current, control the on and off of the current loop in time; PTC guards against severe damage to the battery in a high temperature environment. The general lithium battery protection board usually includes control IC, MOS switch, resistor, capacitor and auxiliary devices FUSE, PTC, NTC, ID, memory and so on. Among them, the control 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 cell’s Safety. The lithium battery protection board also has the function of protecting the battery and guarding against overcharge. When the external power supply continues to charge the battery quickly, the lithium battery protection board will be used for protection. When the internal power of the lithium battery reaches the saturation level, the internal circuit of the lithium battery protection board will automatically cut off the external fast charging power supply. So that the external power source cannot enter the battery. This is exactly the principle that the lithium battery protection board protects the battery from overcharging. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of the advantages and disadvantages of lithium iron phosphate batteries and ternary lithium batteries