Square power type power lithium ion battery pre-charging exhaust method

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a square power type power lithium ion battery pre-charging exhaust method. The method comprises the following steps of 1, firstly injecting an LiPF6 electrolyte, sufficiently standing for 8 to 12h, and then performing a pre-charging exhaust process; 2, sending the pre-charging and pre-discharging process to a battery cell fully standing after liquid injection, wherein the pressure maintaining value is -85 kpa, and the leakage detecting time is 1 min; reducing the negative pressure in the processto-80 kpa or below, vacuumizing automatically to -95 kpa, and after the process is sent, inspecting the equipment state and the battery process sending state; and 3, carrying out segmented charging treatment on the battery cell according to different multiplying powers and different times until the segmented charging is completed, wherein the condition of the battery good product is that the ending capacity is greater tha