Method for determining liquid injection amount of soft package battery

The invention discloses a method for determining the liquid injection amount of a soft package battery, which comprises the following steps: adding a diaphragm into a three-side sealed aluminum plastic film bag, dropwise adding electrolyte, putting into a vacuum oven, vacuumizing, and determining the maximum vacuum degree; selecting a battery system, determining a liquid injection volume V1 according to pore volumes of a positive electrode, a negative electrode and a diaphragm of the battery, and obtaining an optimal liquid injection volume interval; gradient liquid injection is carried out according to the lower limit value of the optimal liquid injection amount interval, the liquid injection amount each time is a preset amount, and the ohmic internal resistance R, the thickness delta 1, the thickness delta 2, the coulombic efficiency and the capacity of the battery after each time of liquid injection are obtained; and the optimal liquid injection amount is determined according to the comparison of the thick