PTC (Positive Temperature Coefficient) heating film for improving temperature consistency of battery module

The utility model particularly relates to a PTC (Positive Temperature Coefficient) heating film for improving the temperature consistency of a battery module. The PTC heating film comprises an electrode layer, a PTC heating conductor layer and a cover film which are sequentially arranged on a bottom film, one end of the PTC heating film is provided with a packaging area, the overlapping area of the ends, close to the packaging area, of the electrode layer and the PTC heating conductor layer is a first coverage area, the overlapping area of the ends, away from the packaging area, of the electrode layer and the PTC heating conductor layer is a second coverage area, and the area between the first coverage area and the second coverage area is a middle coverage area. The average coverage rate of the electrode layer and/or the PTC heating conductor layer in the first coverage area and/or the second coverage area is larger than that of the middle coverage area. According to the arrangement, the heating power of the