Battery cell grouping method for improving grouping efficiency of battery pack

The invention discloses a battery cell grouping method for improving battery pack grouping efficiency, and relates to the technical field of battery pack grouping, the battery cell grouping method comprises the following steps: charging a battery cell from 30% SOC according to a constant and uniform current, and when the voltage reaches the highest voltage, keeping the voltage constant until the current is reduced to a cut-off current; and meanwhile, recording and intercepting the time of a constant-voltage stage, and grouping the capacity according to the delivery capacity (A) of the battery cell, the capacity of the battery cell, the range of the voltage and the internal resistance and the time (T) of the constant-voltage stage. The method has the beneficial effects that when the passing voltage reaches the highest voltage, the voltage is kept constant until the current is reduced to the cut-off current; the voltage (V) and the internal resistance (R) are measured, and the capacity is according to the deliv