Electrothermal film with high area-effect ratio

The invention discloses an electrothermal film with a high area-effect ratio. The electrothermal film is composed of an upper insulating layer, a heating layer, a lower insulating layer, electrodes and a sealing area. All unnecessary space in the heating layer is eliminated, so the effective heating area of the heating layer is enlarged as much as possible; the area of the electrodes and the sealing area is reduced as much as possible under the condition that the requirements for electric conduction and sealing are met; and thus, the area-effect ratio of the effective heating area of the heating layer to the area of the electrothermal film reaches 80% or above. 本发明公开了一种高面积效果比值的电热膜，由上绝缘层、发热层、下绝缘层、电极、密封区组成，发热层排除一切不必要的空间，使发热层的有效发热面积尽可能扩大，电极和密封区在满足导电和密封的需求下，尽可能缩小面积，使得发热层的有效发热面积和电热膜面积之间的面积效果比值达到80%以上。