A composite backplane for photovoltaic modules

Abstract

The invention discloses a composite backboard of a photovoltaic module. The composite backboard is in direct contact with battery strings, and is integrated with the battery strings through a lamination process. The composite backboard adopts a single-layer structure, and the raw materials of the single-layer structure Including mixed A component, B component and C component, wherein, the raw materials of A component include polypropylene resin, first polyester resin curing agent and chopped glass fiber; the raw materials of B component include polyester resin, The second polyester resin curing agent and chopped glass fiber; the raw materials of the C component include EVA resin; the curing temperature of the polyester resin is greater than the melting point of the polypropylene resin; and the temperature of the lamination process is greater than the curing temperature of the polyester resin; The composite backsheet prepared by the invention has good water vapor barrier properties, insulation properties, flame retardancy, weather resistance and deformation resistance properties, while maintaining good plastic processing properties and adhesive properties, without the need for a separate adhesive The adhesive layer can be directly 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...

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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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