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The purpose of sorting is to select cells with similar parameters. Sorting methods have been studied for many years and are mainly divided into two categories: static sorting and dynamic sorting.

Static sorting involves screening characteristic parameters such as open circuit voltage, internal resistance, and capacity of battery cells, selecting target parameters, introducing statistical algorithms, setting screening criteria, and finally dividing the same batch of battery cells into several groups.

Dynamic screening is aimed at screening the characteristics exhibited by battery cells during the charging and discharging process. Some choose constant current and constant voltage charging process, some choose pulse impulse charging and discharging process, and some compare the relationship between their own charging and discharging curves.

Combining dynamic and static sorting, using static screening for preliminary grouping, and based on this, dynamic screening can be carried out to divide more groups and achieve higher screening accuracy, but the cost will also increase accordingly.

This slightly reflects the importance of the production scale of power lithium-ion batteries. Large scale shipment allows manufacturers to carry out finer sorting and obtain battery packs with closer performance. If the output is too small and there are too many groups, each batch cannot be equipped with a battery pack, and even the best method cannot be applied.

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