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What is the purpose of balancing lithium-ion batteries?

Lithium battery packs are made up of multiple batteries. Since the batteries are independent individuals, there will be some slight differences. After the combination is welded, it will be affected by the direction and length of the connecting piece and the welding process. Increasing the generation of differences, each charge and discharge will increase the value of individual differences. When the value reaches a certain height, it will eventually lead to partial overcharge and overdischarge of the battery cell. This situation will cause damage to the battery cell. As a result, the entire set of lithium batteries cannot work effectively. Li-ion battery equalization can solve this problem. When a single string of lithium-ion batteries has a large numerical difference, the equalization voltage of the battery is controlled by the BMS, which can maximize the life of the lithium battery;

What are the effects of unbalanced lithium-ion battery packs;
There is no need to use the equalization circuit on some lithium-ion battery packs with fewer strings and parallels, but it is necessary to ensure that the group of single cells have higher quality and consistency, and the charging and discharging current is small. There is no problem if the battery If it belongs to a larger current discharge, it is very necessary to support equalization. Under normal circumstances, the life of lithium battery packs without equalization function is lower than that of lithium battery packs with equalization function;
What is the importance of equalizing charging to lithium battery packs?

When the high-current lithium-ion battery is used on some airplanes or plant protection drones, due to the excessive current, the protection board is usually not used during discharge, but it needs to be charged with a professional balance charger. Balance charging is safe for the battery. Sex and longevity will have a big impact;