Laminated film battery and preparation method thereof

The invention provides a laminated film cell and a preparation method thereof, and belongs to the technical field of photovoltaic cells. The cell body is provided with a transparent conductive layer, a grid line structure and a dielectric layer which are arranged in sequence, a preset part of the dielectric layer is provided with a conductive path, and the preset part is a part where the dielectric layer covers the grid line structure. The surface modification step comprises the following steps: carrying out modification treatment on the dielectric layer so as to enable the preset surface area to have an exposed grid line material layer; the preset surface area is an area, corresponding to a to-be-connected part of the grid line structure, in the surface of the modified battery body. The preset surface area of the laminated film battery is provided with the exposed grid line material layer, the preset surface area is the area, corresponding to the to-be-connected part of the grid line structure, in the surfac