High-reflectivity photovoltaic module packaging film and application thereof

Abstract

The invention discloses a high-reflectivity photovoltaic module packaging film. The high-reflectivity photovoltaic module packaging film with a surface pre-crosslinked structure is prepared by the following steps: pre-mixing transparent resin with a high-reflectivity additive and other functional accessories, carrying out melting extrusion, film casting and surface pre-crosslinking treatment, and coiling. By adding the high-reflectivity additive, the ultraviolet-resistance performance of the film can be improved, and meanwhile, the utilization rate of a module on sunlight is enhanced, and therefore the effects of improving the service life and photoelectric conversion efficiency of the module are achieved; meanwhile, by virtue of the surface pre-crosslinked structure, the high-reflectivity layer film can be effectively prevented from overflowing during a photovoltaic module laminating process and the appearance of the module is effectively improved; the packaging film is universal for various laminating processes.

Description

technical field [0001] The invention relates to a high-reflectivity photovoltaic module packaging adhesive film, which is used for the packaging of solar cell components, can improve the reflectivity of the battery back layer structure, improve the utilization efficiency of sunlight by the components, and effectively avoid overflow during the lamination process. white phenomenon. Background technique [0002] In the current society, energy conflicts and environmental problems are becoming more and more prominent, and the development of various clean energy is an inevitable trend. In the past two years, the solar photovoltaic industry has recovered, and the demand for photovoltaic modules has gradually increased. Further improving the photoelectric conversion efficiency and durability of photovoltaic modules is the appeal of the entire photovoltaic industry. [0003] At present, more than 80% of solar cell components are crystalline silicon cell components. The theoretical l...

AI Technical Summary

Problems solved by technology

By using a low-melt index resin as the raw material of the film and matching the appropriate component lamination process, the effect of preventing the overflow of the high-reflection film can be achieved, but the use of a low-melt index base resin reduces the processing temperature window of the film , which increases the processing cost; adopt the method of co-extrusion to form a composite structure of transparent film and high-reflection film, match the appropriate component lamination process, the transparent composite layer can play the role of isolation layer, but co-extrusion processing requires production Additional extrusion equipment is added to the line, which increases the processing cost; the above two high-reflection films usually need to be used in conjunction with a special lamination process, usually using a lower lamination temperature to reduce the fluidity of the film, and at the same time Extended lamination time to achieve the required degree of cross-linking, which further reduces the production efficiency of the assembly

The overall pre-crosslinking treatment of the high-reflection film enables the use of conventional lamination processes. However, since the pre-crosslinked film hardly flows during lamination, residual air bubbles and delamination are serious in the component, and the adhesion of the film The junction performance is difficult to meet the requirements