The lithium-ion battery pack does not need a protective plate, which will cause over-discharge of the lithium-ion battery and affect its life. Lithium-ion battery packs are very dangerous to use without a protective plate. Lithium-ion batteries are very active. If there is no protective plate, if there is a short circuit or other factors, it is easy to explode. Multiple protective plates can make the battery overcurrent. , In case of overvoltage, the circuit will be automatically cut off without damaging the battery or exploding.
If there is no lithium-ion battery pack protection board, the life of the lithium-ion battery will not only be affected, but also dangerous situations will occur. The lighter case is that damage to the battery will affect the service life, and the battery will bulge in serious cases. In severe cases, liquid leakage, decompression, explosion or fire will occur.
The lithium-ion battery pack protection board is the charge-discharge protection for series-connected lithium-ion battery packs. When fully charged, it can ensure that the voltage difference between the single cells is less than the set value (generally ± 20mV), realize the equal charging of the single cells of the battery pack, and effectively improve the charging effect in the series charging mode. At the same time, it detects the overvoltage, undervoltage, overcurrent, short circuit and overtemperature status of each single cell in the battery pack to protect and prolong the battery life. Under-voltage protection prevents each single-cell battery from being damaged due to over-discharge when it is being discharged.
The reason why the lithium-ion battery pack needs to be protected is determined by its own characteristics. Since the material of the lithium-ion battery pack itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited and ultra-high temperature charge and discharge, lithium-ion battery components will always appear with a delicate protection board and a current fuse.
The protection function of the lithium-ion battery pack is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage and charge and discharge of the battery cells at all times in the environment of -40°C to +85°C. The current of the loop is controlled in time to control the on-off of the current loop; PTC prevents bad damage to the battery in a high temperature environment.
Ordinary lithium-ion battery pack protection boards usually include 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 turn on when everything is normal, so that the battery cell and the external circuit are connected, and when the battery cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the battery cell. Safety.
