Solar cell module and preparation method thereof

Abstract

The invention discloses a solar cell module and a preparation method thereof. The solar cell module comprises an upper glass board, a front adhesive film layer, a solar cell array, a back adhesive film layer and a backboard which are laminated in turn. The backboard is a water vapor insulating backboard. Water vapor transmittance of the water vapor insulating backboard is less than 0.1mg / m<2> / day. The solar cell array includes multiple cells and conductive wires. The adjacent cells are connected via the conductive wires. The front surface of each cell is provided with secondary gate lines. The conductive wires are welded with the secondary gate lines via a welding layer. The welding layer contains alloys which include Sn and Bi. According to the solar cell module, the connecting effect of the conductive wires and the cells can be enhanced so that photoelectric conversion efficiency can be guaranteed. Besides, the welded layer can be effectively sealed on the upper glass board, the front adhesive film layer, the back adhesive film layer and a lower glass or metal board so that the cell array can be effectively protected, attenuation of the solar cell module can be alleviated and the service life can be prolonged.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a solar cell module and a preparation method thereof. Background technique [0002] Regarding the traditional cell matrix, the current main structure: the silver main grid of the battery is welded to the back of the adjacent battery through the welding strip. The main component of the paste for making the grid line is the expensive precious metal silver. Sn-lead alloy copper strips, common components use EVA as the packaging film, and use polymer materials as the backplane. The following defects have been found in long-term use. [0003] First: The backplane is a polymer backplane material with a certain water vapor transmission rate. Water vapor and corrosive gases in the environment can enter the module through the backplane, corrode the battery sheet and ribbon, and reduce the life of the module; Second: TPT backplanes with better performance cost a lot, and ordinary non-Tedler bac...

AI Technical Summary

Problems solved by technology

[0003] First: The backplane is a polymer backplane material with a certain water vapor transmission rate. Water vapor and corrosive gases in the environment can enter the module through the backplane, corrode the battery sheet and ribbon, and reduce the life of the module; Second: TPT backplanes with better performance cost a lot, and ordinary non-Tedler backplanes are prone to yellowing, cracking, and pulverization after a period of use, which will affect the power and life of the components. The reason also lies in this; thirdly, the wear resistance of polymer materials is low. In the windy and sandy area, the anti-aging layer on the backplane is quickly worn away, causing the PET layer (or copper functional layer) to be exposed to the air. The PET layer is more prone to wear, and the overall wear resistance of the component is low; fourth, the backplane itself is a flexible material, and there is basically no physical protection for the battery on the back, and the battery is easy to crack when it is under pressure or impact; fifth, EVA Although a UV absorber is added in the film, the UV absorber will be gradually consumed under long-term outdoor exposure.

Under the combined action of ultraviolet light and water vapor, EVA will degrade and turn yellow, reduce the power output of the module, and produce small molecules such as acetic acid, which will also corrode the ribbon and the battery, shorten the life of the module and reduce the efficiency

[0004] In addition, battery sheets and ribbons are usually welded with Sn and Pb alloys, but Sn and Pb alloys contain Pb, which pollutes the environment and is not a green material, which is not conducive to popularization and use.

Images