Battery device of light and automatic-balancing electric vehicle

The invention belongs to the field of an accessory of a two-wheel electric vehicle, and particularly provides a battery device of a light and automatic-balancing electric vehicle. The battery device comprises a battery box and a square fixed rack, wherein the square fixed rack is provided with a sliding rail, two ends of the battery box are arranged on the sliding rail, a first iron core coil and a second iron core coil are respectively arranged at two sides of the battery box, a third iron core coil and a fourth iron core coil are correspondingly arranged at two sides of the fixed rack, a sliding block is arranged at a middle part of another sliding rail outside the battery box, a first limitation switch and a second limitation switch are respectively and fixedly arranged at two ends of the sliding rail, the four iron core coils are connected with a positive electrode and a negative electrode of the battery box, current directions in the first iron core coil and the second iron core coil are controlled by a