Method and device for sorting whole retired battery packs

The invention relates to a whole-pack sorting method and device for a decommissioned battery pack, and the method comprises the steps: carrying out the feature extraction of a constant-current and constant-voltage charging curve, obtaining the first energy accumulation of the decommissioned battery pack in a constant-current charging stage and the second energy accumulation of the decommissioned battery pack in a constant-voltage charging stage, and achieving the constant-current and constant-voltage charging process of the decommissioned battery pack. Energy accumulation in the constant-current charging stage and the constant-voltage charging stage is obtained, the operation of repeatedly charging the retired battery cells in the retired battery pack one by one to cut off current is not needed, the operation process is reduced, and the detection time is shortened; furthermore, correlation analysis is carried out according to the first energy accumulation and the second energy accumulation to obtain target ch