Liquid injection machine for square aluminum shell lithium battery

The invention relates to the technical field of lithium battery liquid injection machines, and particularly discloses a square aluminum shell lithium battery liquid injection machine which comprises a liquid injection machine main body, the cross section of the liquid injection head is convex, and the liquid injection head is connected with the liquid injection machine main body; the guide mechanism is located on the inner wall of the liquid injection head, the guide mechanism is automatically unfolded when the liquid injection head is inserted into a liquid injection opening of the square aluminum shell lithium battery, and when the liquid injection head just starts to add electrolyte into the liquid injection opening, the liquid injection machine for the square aluminum shell lithium battery automatically disperses towards the periphery of the interior of the lithium battery through the unfolded guide mechanism; therefore, overflow caused by accumulation of a large amount of electrolyte at the electrolyte i