Why do lithium batteries need a BMS?

The function of the BMS is mainly to protect the cells of lithium batteries, maintain safety and stability during battery charging and discharging, and play an important role in the performance of the entire battery circuit system. Most people are confused as to why lithium batteries require a lithium battery protection board before they can be used. Next, let me briefly introduce to you why lithium batteries require a lithium battery protection board before they can be used.

First of all, because the material of the lithium battery itself determines that it cannot be overcharged (overcharging of lithium batteries is prone to the risk of explosion), over-discharged (over-discharging of lithium batteries can easily cause damage to the battery core, cause the battery core to fail and lead to the scrapping of the battery core), Over-current (over-current in lithium batteries can easily increase the temperature of the battery core, which may shorten the life of the battery core, or cause the battery core to explode due to internal thermal runaway), short circuit (short circuit of the lithium battery can easily cause the temperature of the battery core to increase, causing internal damage to the battery core. Thermal runaway, causing cell explosion) and ultra-high temperature charging and discharging, the protection board monitors the battery’s over-current, short circuit, over-temperature, over-voltage, etc. Therefore, the lithium battery pack always appears with a delicate BMS.

Secondly, because overcharge, over-discharge, and short circuit of lithium batteries may cause the battery to be scrapped. The BMS plays a protective role. During use of the lithium battery, every time it is overcharged, over-discharged, or short circuited, the battery will be reduced. life. In serious cases, the battery will be scrapped directly! If there is no lithium battery protection board, directly short-circuiting or overcharging the lithium battery will cause the battery to bulge, and in severe cases, leakage, decompression, explosion or fire may occur.

In general, the BMS acts as a bodyguard to ensure the safety of the lithium battery.