A method for grouping lithium secondary battery packs comprises the following steps: charging and discharging a battery for 1-3 cycles, recording the last discharge capacity C0, setting a capacity lower limit, and determining the battery with the C0 thereof not less than the capacity lower limit to be an eligible battery; discharging the battery to a discharge cut-off voltage Vd so the battery is discharged to a power empty state; charging the empty battery to a capacity C1; storing the battery for time t1 in an environment with a temperature ranging between 20-50° C., recording the battery voltage V1, storing the battery again for time t2 in the environment with the temperature ranging between 20-50° C., recording the battery voltage V2, calculating a voltage difference ΔV=V2−V1 and setting the range of ΔV; and grouping eligible batteries in a previous step according to a certain capacity grouping standard.