Method for recycling and pretreating waste lithium ion battery

The invention relates to the technical field of battery recovery, in particular to a waste lithium ion battery recovery pretreatment method, and provides the following scheme aiming at the problems that in the prior art, waste lithium ion batteries with different residual electric quantities are inconvenient to thoroughly discharge, the discharge time is not easy to control, the recovery treatment work is not easy to carry out, and the efficiency is low. The method comprises the following steps: S1, carrying out electric quantity detection on the waste lithium ion battery, and recording detection data; s2, classifying the waste lithium ion batteries according to the residual electric quantity according to the detected data. The waste lithium ion batteries are subjected to electric quantity detection, the detected data are recorded, the waste lithium ion batteries are classified according to the residual electric quantity according to the detected data, and the classified waste lithium ion batteries are discha