Lithium battery capacity division refers to the process of classifying lithium batteries of the same type according to voltage and capacity. Its role is to ensure the performance and safety of lithium batteries in actual use.

　　First of all, the lithium battery capacity can help us choose battery components. In the production process, lithium batteries have slight differences, which can lead to poor performance of some batteries. By accurately measuring and classifying the voltage and capacity, we can group the batteries in the battery module according to performance, and relatively uniform battery performance can improve the performance and life of the entire battery pack.

　　Secondly, the lithium battery capacity can improve the balance of the battery pack. During the operation of the battery pack, the difference in voltage and capacity between different batteries will lead to the inconsistent degree of charge and discharge between different batteries. If this imbalance is not corrected in time, it will lead to the accumulation of imbalance, and eventually lead to the deterioration of battery pack performance and failure. By dividing the capacity of lithium batteries, the batteries within the components can have similar performance, thereby reducing the appearance of imbalance and extending the service life of the entire battery pack.

　　In addition, the lithium battery capacity can also improve the safety of the battery pack. Due to the poor balance of the battery in the battery pack, there will be some abnormal conditions, such as overcharge, overdischarge, etc., which poses a threat to the safety of the battery. By dividing the battery capacity, the probability of unbalanced state in the battery pack can be reduced, the risk of abnormal conditions can be reduced, and the safety of the battery pack can be improved.

　　The specific process of dividing the capacity of a lithium battery involves measuring the voltage and capacity of each cell in the battery module and classifying it according to these data. The usual method is to test each cell in the battery assembly and then compare the test results with the set criteria to determine the capacity group to which it belongs. In general, the battery will be divided into normal, high capacity, low capacity and failure four groups.

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