The invention discloses a sorting method and
system for reuse of retired battery modules. The method comprises the steps that S1, qualified echelon modules are pre-selected according to a pre-
selection rule; S2, the initial
voltage of each
battery cell in the echelon modules is measured, each
battery cell is subjected to constant-current discharging to a set value, and after discharging is finished, standing is conducted for a first set time, and then the
voltage of each
battery cell is measured; S3, the echelon modules are charged to the upper limit total
voltage; S4, after charging is finished, waiting is conducted for a second set time, the open-circuit voltage OCV1 and the alternating-current
internal resistance R of the echelon modules are measured, then the echelon modules are transferred into a
storage area, and after waiting is conducted for a third set time, the open-circuit voltage OCV2 of each echelon module is measured; S5, the k value of each echelon module is calculated; and S6, data in the step S3 and the step S5 are sorted and then classified according to set standards, and then the echelon modules are transferred into a production and
assembly link according to grading standards for echelon utilization so as to form the finished product pack. According to the sorting method and
system for reuse of the retired battery modules, the sorting process is simple and reliable, the
processing time is short, and the requirement for
mass production is met.