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In this way, small capacity cells are always fully charged and discharged, while large capacity cells are always using a portion of their capacity. There is always a portion of the capacity of the entire battery pack that is idle

2) Life loss, similarly, the lifespan of a battery pack is determined by the battery cell with the shortest lifespan. It is highly likely that the battery with the shortest lifespan is the one with a smaller capacity. Small capacity battery cells are always fully charged and discharged, and if the output is too strong, they are likely to reach the key point 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.

The above three parameters are not completely independent. Cells with deep aging have higher internal resistance and more capacity degradation. Separate explanations are only intended to clarify their respective directions of influence.

3. How to deal with inconsistency

The inconsistency in battery cell performance is formed during the production process and deepened during use. Within the same battery pack, the weaker cells remain weak and accelerate to weaken. The degree of dispersion of parameters between individual battery cells increases with the deepening of aging.

Currently, engineers need to consider three aspects when dealing with inconsistent individual battery cells. Single cell battery sorting, thermal management after grouping, and battery management system supply balancing function in case of a small amount of inconsistency.

3.1 Sorting

Different batches of battery cells should not be used together in theory. Even for cells from the same batch, they need to be screened and placed in the same battery pack with relatively concentrated parameters.

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