Composite backboard of photovoltaic module

Abstract

The invention discloses a composite backboard of a photovoltaic module, the composite backboard is in direct contact with a battery string layer, the composite backboard and the battery string layer are packaged into a whole through a lamination process, the composite backboard adopts a single-layer structure, and the raw material of the single-layer structure comprises a component A, a component B and a component C, wherein the component A comprises the following raw materials: polypropylene resin, a first polyester resin curing agent and chopped glass fibers; the component B comprises the following raw materials: polyester resin, a second polyester resin curing agent and chopped glass fibers; the raw material of the component C comprises EVA resin; the curing temperature of the polyester resin is higher than the melting point of the polypropylene resin; the temperature of the lamination process is higher than the curing temperature of the polyester resin; the composite backboard prepared by the invention has good water vapor barrier permeability, insulativity, flame retardance, weather resistance and deformation resistance, keeps good plastic processing performance and adhesion performance, does not need to be independently provided with an adhesive layer, and can be directly contacted and laminated with the battery string layer.

Description

technical field [0001] The invention relates to the packaging field of photovoltaic power generation, in particular to a composite backplane of a photovoltaic module. Background technique [0002] Due to the good water vapor permeability, insulation and good thermoplastic processing performance of polypropylene, it has been widely used in various packaging and protection fields that require insulation and waterproofing, specifically, packaging for photovoltaic modules backplane. [0003] However, in addition to meeting the characteristics of water vapor barrier and insulation, photovoltaic packaging materials also need to meet the requirements of aging resistance, flame retardancy and deformation resistance. However, this is a shortcoming of the polypropylene material itself. Therefore, people usually need to set up multiple functional sheet layers to compound the photovoltaic backplane. Specifically, it is necessary to set up additional anti-deformation layers, weather-res...

AI Technical Summary

Problems solved by technology

[0003] However, in addition to meeting the characteristics of water vapor permeability and insulation, photovoltaic packaging materials also need to meet the requirements of aging resistance, flame retardancy and deformation resistance, but this is a shortcoming of the polypropylene material itself.

Therefore, people usually need to set up multiple functional sheet layers to compound the photovoltaic backplane. Specifically, it is necessary to set up additional anti-deformation layers, weather-resistant layers, and flame-retardant layers. Different layer structures will not only cause further adhesion problems between each other, but also The anti-deformation layer, weather-resistant layer, and flame-retardant layer on the outside perform poorly in terms of water vapor barrier and flexibility. At the same time, the polypropylene layer in the middle layer still has the problems of poor deformation resistance and flame retardancy. After being combined into a composite sheet, the performance defects in these different layers will still be the key factor affecting the service life of the photovoltaic backsheet; moreover, the backsheet using multilayer composite sheets also has a big problem in heat dissipation, which will have a negative impact on the photovoltaic backplane. Negative impact on the conversion efficiency of photovoltaic cells (this is due to the fact that higher operating temperatures will significantly affect the photoelectric conversion efficiency of photovoltaic cells)

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