Lithium battery pack of electric vehicle

The utility model relates to a lithium battery pack of an electric vehicle, which comprises an outer box body and a lithium battery pack positioned in the outer box body, two opposite side walls of the outer box body are respectively provided with an air inlet window and an air outlet window which extend outwards, and heating films are arranged in the other two opposite side walls; a filter screen and a fan are arranged in the air inlet window from outside to inside, an opening and closing mechanism is arranged on the outer side of the air outlet window, the opening and closing mechanism comprises a plurality of opening and closing fan blades and a driving motor, the opening and closing fan blades are transversely arranged side by side, and the opening and closing fan blades are rotationally assembled in the air inlet window through a vertical shaft rod; the driving motor is arranged outside the air inlet window, the output end of the driving motor is connected with the vertical shaft rod, and the driving mot