CN108075004A - Double glass photovoltaic modulies - Google Patents

Abstract

The application provides a kind of double glass photovoltaic modulies, including cover-plate glass, back-panel glass, packaging adhesive film and photovoltaic cell between back-panel glass and cover-plate glass, the back-panel glass includes glass baseplate and is formed at the white composite film of the glass baseplate outer surface, and the white composite film includes white PE layers from top to bottom set, layer of polyurethane and pet layer.The application in back-panel glass by setting white composite film, reduce the waste of light, so that more light are reflexed to by white composite film on the light-receiving surface of photovoltaic cell, the light utilization of photovoltaic cell is improved, is conducive to the promotion of photovoltaic module generating efficiency.

Description

Double glass photovoltaic module

technical field

The present application relates to photovoltaic power generation technology, in particular to a double-glass photovoltaic module.

Background technique

The typical structure of double-glass photovoltaic modules is: front glass/upper transparent EVA film/photovoltaic cells/lower transparent EVA film/lower back glass. At present, double-glass photovoltaic modules are generally divided into two types: transparent double-glass and white double-glass. The former has a transparent back glass structure, which will cause light leakage in the cell gap and the edge of the module after the light enters the module, which will bring power to the module. The latter uses white materials to reduce light loss. The method adopted by the industry is to replace the lower transparent EVA film with a white encapsulation film. The light can be finally reflected to the surface of the photovoltaic cell, thereby improving the utilization rate of light and increasing the power of the module.

However, the white encapsulation film also has some deficiencies, for example, there are problems such as overflow and wrinkles during the lamination process. Since the film is white, these problems can be easily found after they appear, which will affect the overall appearance of the photovoltaic module and cause bad.

Contents of the invention

In view of this, the present application provides a double-glass photovoltaic module to reduce light loss.

Specifically, the present application is achieved through the following technical solutions: a double-glass photovoltaic module, including a cover glass, a back glass, an encapsulant film between the back glass and the cover glass, and photovoltaic cells, the The back glass includes a glass substrate and a white composite film layer formed on the outer surface of the glass substrate, and the white composite film layer includes a white PE layer, a polyurethane layer and a PET layer arranged from top to bottom.

Further, the thickness of the white composite film layer is 250-400 μm.

Further, the thickness of the white PE layer is 40-100 μm, the thickness of the polyurethane layer is 10-50 μm, and the thickness of the PET layer is 200-250 μm.

Further, the surface of the cover glass is provided with an anti-reflection light conversion coating layer, and the anti-reflection light conversion coating layer contains light conversion particles.

Further, a concavo-convex reflective structure is provided on the inner surface of the glass back plate.

Further, the glass substrate is double-sided patterned glass, and both the inner surface and the outer surface of the glass substrate are printed with prismatic patterns.

Further, the light transmittance of the cover glass in the visible light band is greater than 90%, and the reflectance of the white composite film layer in the visible light band is greater than 80%.

This application reduces the waste of light by setting a white composite film layer on the back glass, so that more light is reflected to the light-receiving surface of the photovoltaic cell through the white composite film layer, which improves the light utilization rate of the photovoltaic cell. It is conducive to the improvement of the power generation efficiency of photovoltaic modules.

Description of drawings

Fig. 1 is a schematic structural view of the double-glass photovoltaic module described in this application.

Fig. 2 is a schematic structural view of the white composite film layer of the double-glass photovoltaic module described in this application.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also be called second information, and similarly, second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination."

Please refer to FIG. 1, the present application discloses a double-glass photovoltaic module 100, which includes a cover glass 10, a back glass 20, an encapsulant film 30 between the back glass 20 and the cover glass 10, and a photovoltaic cell. The sheet 40, the cover glass 10, the back glass 20, the encapsulation film 30 and the photovoltaic cell sheet 40 are laminated by a laminator to form an integrated laminate.

The back glass 20 includes a glass substrate 21 and a white composite film layer 22 formed on the outside of the glass substrate 21, wherein the glass substrate 21 is double-sided patterned glass, which has an inner surface and an outer surface. The surface 23, preferably, the inner surface and the outer surface 23 are printed with ribbed patterns (not shown). The white composite film layer 22 is formed on the outer surface 23 of the glass substrate 21 and is adjacent to the outside atmosphere, while the inner surface of the glass backplane 20 is used to be in contact with the packaging film 30, and the inner surface Concave-convex reflective structures 24 are provided on the surface. Since the back glass 20 is glass made of transparent material, the white composite film layer 22 has a reflection effect on the light passing through the back glass 20, and can pass through the gaps between the battery sheets and reach the back plate part of the light. It is reflected back, and finally reflects the light to the surface of the photovoltaic cell.

In a preferred embodiment of the present application, the white composite film layer 22 is a multi-layer structure, as shown in FIG. The white PE layer 25 is located on the innermost side and is arranged on the outer surface 23 of the back glass 20, the PET layer 27 is located on the outermost side, and the thickness of the white composite film layer 22 is 250-400 μm. The thickness of the white PE layer 25 is 40-100 μm, the thickness of the polyurethane layer 26 is 10-50 μm, and the thickness of the PET layer 27 is 200-250 μm. After testing, the reflectance of the white composite film layer 22 in the visible light band is >80%. Among them, the aforementioned PE is Polyethylene (polyethylene), and the aforementioned PET is Polyethylene Terephthalate (polyethylene terephthalate).

In addition, the surface of the cover glass 10 is provided with an anti-reflection light conversion film layer 11, and the anti-reflection light conversion film layer 11 contains light conversion particles, and the light conversion particles are organic light conversion particles, which can convert light that is not easily The infrared light and ultraviolet light absorbed by the components are converted into visible light easily absorbed by the components, which improves the light energy utilization rate and the photoelectric conversion efficiency of the photovoltaic components. After testing, the light transmittance of the cover glass 10 in the visible light band is >90%.

The present application reduces the waste of light by setting the white composite film layer 22 on the back glass 20, so that more light is reflected to the light-receiving surface of the photovoltaic cell sheet 40 through the white composite film layer 22 on the back plate, improving the The light utilization rate of photovoltaic cells is conducive to the improvement of photovoltaic module power generation efficiency.

The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application should be included in the application. within the scope of protection.

Claims (7)

1. A double-glass photovoltaic module, comprising a cover glass, a back glass, an encapsulating adhesive film between the back glass and the cover glass, and photovoltaic cells, wherein the back glass includes a glass substrate And a white composite film layer formed on the outer surface of the glass substrate, the white composite film layer includes a white PE layer, a polyurethane layer and a PET layer arranged from top to bottom. 2. The double-glass photovoltaic module according to claim 1, wherein the thickness of the white composite film layer is 250-400 μm. 3. The double-glass photovoltaic module according to claim 2, wherein the thickness of the white PE layer is 40-100 μm, the thickness of the polyurethane layer is 10-50 μm, and the thickness of the PET layer is 200-100 μm. 250 μm. 4 . The double-glass photovoltaic module according to claim 1 , wherein the surface of the cover glass is provided with an anti-reflection light conversion film layer, and the anti-reflection light conversion film layer contains light conversion particles. 5 . The double-glass photovoltaic module according to claim 1 , wherein a concavo-convex reflective structure is provided on the inner surface of the glass back plate. 6 . 6 . The double-glass photovoltaic module according to claim 1 , wherein the glass substrate is double-sided embossed glass, and both the inner surface and the outer surface of the glass substrate are printed with prismatic patterns. 7. The double-glass photovoltaic module according to claim 1, wherein the light transmittance of the cover glass in the visible light band is greater than 90%, and the reflectance of the white composite film layer in the visible light band is greater than 80%.