Battery module

The invention discloses a battery module. The battery module comprises a plurality of battery cells and a heating film. The heating film is wound and coated on the side surfaces of the plurality of battery cells in a snakelike manner, and the size of the side surfaces, coated by the heating film, of the battery cells is in direct proportion to the distance from the battery cells to the centers of the plurality of battery cells. According to the battery module, the side surfaces of the plurality of battery cells are wound and coated in a snakelike manner, so that the heating area is increased. Besides, the farther the battery cells are away from the center of the plurality of battery cells, the larger the area of the side face, wrapping the battery cells, of the heating film (namely, the larger the heating area of the heating film) is, the temperature difference caused by the fact that the heat dissipating capacity of the battery cells located at the farther distance is larger than that of the battery cells lo