Multi-layered film and photovoltaic module including the same

Abstract

A multi-layered film, a backsheet for photovoltaic modules, a method of manufacturing the same, and a photovoltaic module are provided. The multi-layered film can be configured so that a resin layer including a fluorine-based polymer and an oxazoline group-containing polymer is formed on a substrate. As a result, the resin layer including the fluorine-based polymer can have excellent durability and weather resistance, and show high interfacial adhesive strength to the substrate. During the preparation of the multi-layered film, a drying process can also be performed at a relatively low temperature, so that the manufacturing costs can be reduced and the quality of the product can be prevented from being deteriorated by thermal deformation or thermal shock. The multi-layered film may be effectively used as the backsheet in a variety of photovoltaic modules.

Description

BACKGROUND[0001]1. Technical Field[0002]The disclosure relates to a multi-layered film, a backsheet for photovoltaic modules, a method of manufacturing the same, and a photovoltaic module comprising the multi-layered film.[0003]2. Related Art[0004]Recently, much attention has been paid to renewable and clean energy because of global environmental problems and exhaustion of fossil fuels. Among these, solar energy has attracted attention as a representative pollution-free energy source which can solve the problems of environmental contamination and exhaustion of fossil fuels.[0005]A photovoltaic cell to which a principle of photovoltaic power generation is applied is a device configured to convert sunlight into electric energy. Since the photovoltaic cell is exposed to external environments for a long time to facilitate absorption of sunlight, it is manufactured into a unit by performing several packaging processes to protect the cells. The unit is referred to as a photovoltaic module...

AI Technical Summary

Benefits of technology

The present invention provides a photovoltaic module with a light-receiving sheet that can protect the module from outdoor environments. The light-receiving sheet has excellent light transmission, electric insulation, and mechanical, physical or chemical strength. Examples of suitable light-receiving sheets include glass plates, fluorine-based resin sheets, cyclic polyolefin-based resin sheets, polycarbonate-based resin sheets, poly(meth)acrylic-based resin sheets, polyamide-based resin sheets, or polyester-based resin sheets. The use of a glass plate with excellent heat resistance is one example, but the invention is not limited to this. Overall, the invention provides a reliable and durable photovoltaic module that can withstand various outdoor environments.

Problems solved by technology

However, the PVF resin has poor adhesion to a polyethylene terephthalate (PET) film typically used as a substrate for the backsheet.

However, this requires the use of expensive film preparing equipment, an adhesive and the application of additional adhesive coating and laminating processes.

In addition, a film having a higher thickness than that is required to facilitate handling of the film should be used during the preparation of a film, the use of various additives and fillers are limited, and a high processing temperature is required.

A large amount of energy is used to apply high-temperature heat to a PVF resin solution, which requires a high drying temperature.

Accordingly, this increases the production costs of the backsheet for photovoltaic modules and also inflicts thermal shocks on a substrate or causes thermal deformation of the substrate, thereby degrading the quality (e.g., mechanical characteristics, etc.) of the product and rapidly deteriorating the mechanical properties over a long-term outdoor use.

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