Charging and discharging method for improving OCV consistency of lithium ion battery

The invention discloses a charging and discharging method for improving the OCV consistency of a lithium ion battery, and the method comprises the steps: 1, carrying out the constant-current and constant-voltage charging: employing a constant-current and constant-voltage charging mode, and charging the voltages of a plurality of batteries of the same model to a first voltage V1; 2, standing, namely continuously standing the battery for 5-30 minutes; 3, a constant-current discharging step: discharging the plurality of batteries for 1CAh by adopting a constant-current discharging mode; 4, standing: continuously standing the plurality of batteries for 5-30 minutes; 5, a constant-current and constant-voltage charging step: charging the voltages of the plurality of batteries to a second voltageV2 by adopting a constant-current and constant-voltage charging mode; and 6, a standing step: continuously standing the plurality of batteries for 5-30 minutes to finally improve the consistency of the open-circuit voltage O