Battery liquid injection port sealing method and device

The invention provides a method and a device for sealing a liquid injection port of a battery. The method for sealing the liquid injection port of the battery comprises the following steps: putting a plurality of sealing nails into a charging tray provided with a plurality of fixing holes; the charging tray is shot to obtain a charging tray image, first sealing nail images are obtained through the charging tray image, the states of the sealing nails are recognized based on the first sealing nail images, recognition results of all the first sealing nail images are gathered, and all the sealing nails located in the fixing holes in the charging tray are counted; and grabbing the sealing nail positioned in the fixing hole and striking the sealing nail to a battery liquid injection opening. According to the invention, the probability of successful nail taking is improved, the time for grabbing the sealing nail is shortened, the grabbing efficiency is improved, and the working efficiency of sealing the liquid injec