Lithium ion battery extrusion screening self-discharging method

The invention discloses a lithium ion battery extrusion screening self-discharging method, and relates to the field of lithium ion batteries. According to the specific implementation scheme, the method comprises the following steps: screening lithium ion batteries to obtain screened lithium ion batteries; the SOC value of the screened lithium ion batteries is adjusted, and the lithium ion batteries are assembled into small modules; after the small module stands for a period of time, calculating the voltage drop of the battery cells of the small module in unit time, removing abnormal battery cells, and replacing the abnormal battery cells with new battery cells; and glue pouring and welding production can be carried out after the self-discharge of each battery cell in the small module is not abnormal. The purpose of extrusion is achieved through the initial pressure of the battery cells in the module, self-discharge is screened through pressure drop in the extrusion state, the battery cells with poor physical