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How to control the consistency of lithium-ion battery packs?

At present, the industry generally adopts battery management systems to control the consistency and safety of batteries within lithium-ion battery packs, in order to protect the battery pack and extend the service life of products. The use of a Battery Management System (BMS) can achieve control over the relative consistency of batteries, thereby preventing possible overcharging and discharging caused by inconsistent batteries during use, and relatively extending the service life of battery packs. A battery management system with balancing function to some extent addresses the issue of battery pack inconsistency, maximizing battery pack capacity and energy utilization.

What issues may arise with inconsistent lithium-ion battery packs?

Inconsistent battery cells used in series can cause the following problems:

1. Capacity loss refers to the formation of lithium-ion battery packs with individual battery cells, which conform to the principle of a wooden barrel. The capacity of the worst battery cell determines the overall capacity of the battery pack;

2. Life loss, small capacity battery cells that are always fully charged and discharged, with excessive output, are likely to reach the focus of their lifespan first. As the lifespan of the battery cells comes to an end, a set of soldered battery cells will also come to an end.

3. As the internal resistance increases, different internal resistances flow through the same current, and cells with higher internal resistance generate more heat. If the battery temperature is too high, it will accelerate the degradation rate and further increase the internal resistance. Internal resistance and temperature rise form a pair of negative feedback, accelerating the degradation of high internal resistance cells.

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