Photovoltaic packaging adhesive film

Abstract

The invention provides a photovoltaic packaging adhesive film. The packaging adhesive film has a uniform crosslinking degree which is 5-30%. The packaging adhesive film comprises, by mass, 80-120 parts of silane grafted olefin polymer, 10-50 parts of olefin polymer, 2-15 parts of reflective pigment and 0.05-2 parts of anti-ageing agent, wherein the silane grafting rate of the silane grafted olefin polymer is 0.5-3%. The adhesive film guarantees lamination performance of an assembly and is higher in assembly yield compared with the prior art. The reflectivity of the adhesive film is improved, the anti-ageing performance is better, safety and reliability of the photovoltaic assembly are ensured, bubbles and other defects in the assembly lamination process can be reduced or avoided, and the assembly yield is further increased.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to a technology for packaging photovoltaic modules. Background technique [0002] With the development of photovoltaic modules to the present, an increase in power generation efficiency of 1% or even less is a major technological advancement. However, the improvement of power generation efficiency is not limited to the cells themselves. Packaging materials, as an important part of photovoltaic modules, also contribute to the improvement of power generation efficiency, which is worth digging into. [0003] In order to improve the power generation efficiency of photovoltaic modules, the back packaging surface of photovoltaic modules should have a high reflectivity. When the sunlight irradiated into the cell gap reaches the surface of the cell through multiple reflections between the back packaging material and the glass, it is conducive to the full use of sunlight. . Some...

AI Technical Summary

Problems solved by technology

[0005] The technology of high-reflective packaging film is mainly to add a certain proportion of reflective pigments to the transparent packaging film, so that the reflectivity can reach more than 70%, but there are still lamination appearance problems in practical applications, such as, When the module is laminated, the adhesive film foams to make the surface rough and wrinkled, which will greatly affect its reflection performance, and a small amount of overflow of the lower adhesive film will block the edge of the cell, resulting in power loss of the module

[0006] Patent document CN102361043A discloses a high-reflection EVA packaging adhesive film and its preparation method. The specific measure is to add titanium dioxide powder to the EVA adhesive film. Both belong to EVA, the polarity is not much different, and it is easy to cross and fuse during the lamination process, resulting in rough contact surface, wrinkles, poor reflection effect, and even the high reflection filler in the lower film overflows and blocks and contaminates the cell. , The condition of the welding strip seriously affects the appearance of the component and causes the power loss of the component

Patent document CN104497899 A discloses a high-reflection encapsulation film with pre-crosslinked surface. The specific measure is to add a photoinitiator to the encapsulation film, extrude the film and irradiate the surface to pre-crosslink the surface. 0.05mm~0.1mm, the crosslinking degree of the pre-crosslinked layer is greater than 75%, so as to improve the reflectivity and solve the apparent problems such as overflow of the packaging film. Wrinkles appear, and the high degree of cross-linking on the surface of the adhesive film will lead to a decrease in wettability to inorganic materials and a significant decrease in adhesion, which poses a safety hazard when used in double-glass modules

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