CN105720123A - Double-glazed assembly - Google Patents

Abstract

The invention discloses a double-glass assembly, which includes a rear cover glass, the inner side of the rear cover glass includes a battery sheet area and a gap area, wherein the gap area includes a gap between battery sheets and a plurality of the The gap between the battery strings composed of battery slices, the gap area has a reflective structure, which is used to directional reflect the sunlight irradiated on the gap area to the front cover glass, and then reflected by the front cover glass to the the battery sheet. In the double-glass assembly, by setting a reflective structure in the gap area of the rear glass cover, the reflective structure of the rear cover glass will directionally reflect the sunlight irradiated into the gap area to the front cover glass, and then reflected by the front cover glass to The battery sheet increases the absorption of internally reflected light by the double-glass module, thereby improving the solar light absorption efficiency of the double-glass module and increasing the output power of the double-glass module.

Description

A double glass component

technical field

The invention relates to the field of photovoltaic module packaging, in particular to a double-glass module.

Background technique

The structure of the crystal-silicon double-glass module from top to bottom is front cover glass-upper packaging material-cell sheet-lower packaging material-back cover glass. Usually, coated low-iron tempered glass is used as the front cover, and transparent tempered glass As the rear cover, EVA or PVB, etc. are used as the upper and lower packaging materials.

Compared with conventional photovoltaic modules, crystalline silicon double-glass modules are not only safer, but also solve the problems of material aging and power attenuation caused by outdoor degradation of traditional backplanes while providing clean and environmentally friendly power. However, the rear cover of this double-glass module is made of transparent tempered glass, and its overall light transmission makes the sunlight irradiated between the cells and the strings directly pass through the photovoltaic module, resulting in waste of light energy, thereby reducing the double-glass output power of the component.

At present, there are many ways to enhance the absorption of internally reflected light by double-glass module cells, mainly in the following three ways:

The first structure is a double-glass module consisting of upper glass, upper packaging material, photovoltaic cells, lower packaging material and lower glass from top to bottom, wherein the upper packaging material is laid on the front of the photovoltaic cell, which is transparent packaging material, the lower packaging material is laid on the back of the photovoltaic cells, which is a non-transparent packaging material.

The second structure is a double-glass module consisting of upper glass, upper packaging material, photovoltaic cells, lower packaging material, white coating and lower glass from top to bottom, wherein the upper packaging material is laid on the front of the photovoltaic cells , which is a transparent encapsulation material, the encapsulation material of the lower layer is laid on the back of the photovoltaic cells, and the white coating is coated on the contact surface between the lower glass and the encapsulation material of the lower layer.

The third structure is: a double-glass assembly consisting of upper glass, upper packaging material, photovoltaic cells, reflective layer, lower packaging material, and lower glass from top to bottom. The gap between the cells or a plurality of the cells In the gap area between battery strings composed of sheets, the upper surface of the reflective layer has a first reflective film.

Among the many solutions to the problem of enhancing the absorption of internally reflected light by double-glass module cells, the non-transparent packaging material of the lower layer will cause glue overflow and air bubbles; the contact surface between the lower glass and the lower packaging material is coated with White coating, where the white coating in the cell area has no gain effect on increasing the light absorption inside the component; adding a reflective layer between the cell and the underlying packaging material will make the packaging material and component manufacturing process more complicated.

Contents of the invention

The purpose of the present invention is to provide a double-glass component, which improves the output power.

In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a double-glass module, which includes a rear cover glass, and the inner side of the rear cover glass includes a cell area and a gap area, wherein the gap area includes a gap area between the cells The gaps between the gaps and the gaps between the battery strings composed of a plurality of the cells, the gap region has a reflective structure for directional reflection of the sunlight irradiated on the gap region to the front cover glass, and then the The front cover glass is reflected to the battery sheet.

Wherein, the thickness of the gap area is equal to the thickness of the battery sheet.

Wherein, the reflective structure is at least one reflective slope and/or at least one reflective curved surface.

Wherein, the adjacent reflective slopes or the reflective curved surfaces intersect.

Wherein, the included angle between adjacent said reflective slopes is 60°-120°.

Wherein, it also includes a reflective film arranged on the surface of the reflective structure.

Wherein, the reflective film is _TiO2 thin film or AlO thin film.

Compared with the prior art, the double-glass module provided by the embodiment of the present invention has the following advantages:

The double-glass assembly provided by the embodiment of the present invention includes a rear cover glass, and the inner side of the rear cover glass includes a cell area and a gap area, wherein the gap area includes a gap between cells and a plurality of the The gap between the battery strings composed of battery slices, the gap area has a reflective structure, which is used to directional reflect the sunlight irradiated on the gap area to the front cover glass, and then reflected by the front cover glass to the the battery sheet.

In the double-glass assembly, by setting a reflective structure in the gap area of the rear glass cover, the reflective structure of the rear cover glass will directionally reflect the sunlight irradiated into the gap area to the front cover glass, and then reflected by the front cover glass to The battery sheet increases the absorption of internally reflected light by the double-glass module, thereby improving the solar light absorption efficiency of the double-glass module and increasing the output power of the double-glass module.

To sum up, in the double-glass module provided by the embodiment of the present invention, the output power of the double-glass module is improved by arranging a reflective structure in the gap region of the rear glass cover.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a specific embodiment of a double-glass module provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a light-reflecting structure and an optical path of a double-glass component provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of a reflective structure and an optical path of a double-glass module provided by an embodiment of the present invention.

detailed description

As mentioned in the background technology section, among the existing solutions to the problem of enhancing the absorption of internally reflected light by double-glass module cells, the lower packaging material is non-transparent packaging material, which will cause glue overflow and air bubbles; The contact surface with the underlying packaging material is coated with a white coating, and the white coating in the cell area has no gain effect on increasing the light absorption inside the module; adding a reflective layer between the cell and the underlying packaging material will make the packaging material And the preparation process of components is more complicated.

Based on this, an embodiment of the present invention provides a double-glass assembly, including a rear cover glass, the inner side of the rear cover glass includes a cell area and a gap area, wherein the gap area includes a gap between cells And the gap between the battery strings composed of a plurality of battery sheets, the gap area has a reflective structure, which is used to reflect the sunlight irradiated on the gap area to the front cover glass in a direction, and then the front cover The plate glass reflects to the cells.

To sum up, in the double-glass module provided by the embodiment of the present invention, by setting a reflective structure in the gap area of the rear glass cover, the reflective structure of the rear cover glass will directionally reflect the sunlight irradiated into the gap area to the front cover glass , and then reflected by the front cover glass to the battery sheet, which increases the absorption of internally reflected light by the double-glass module, thereby improving the solar light absorption efficiency of the double-glass module and increasing the output power of the double-glass module.

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the invention is not limited to the specific implementations disclosed below.

Please refer to Figures 1-3, Figure 1 is a schematic structural diagram of a specific implementation of the double-glass module provided by the embodiment of the present invention; Figure 2 is a schematic diagram of a reflective structure and its optical path of the double-glass module provided by the embodiment of the present invention ; FIG. 3 is a schematic diagram of a reflective structure and an optical path of a double-glass component provided by an embodiment of the present invention.

In a specific embodiment, the double-glass assembly includes a rear cover glass 10, and the inner side of the rear cover glass 10 includes a cell area and a gap area, wherein the gap area includes the space between the cell sheets 40. and the gap between the cell strings composed of a plurality of battery sheets 40, the gap area has a reflective structure 11 for directional reflection of the sunlight irradiated on the gap area to the front cover glass 20, and then reflected from the front cover glass 20 to the battery sheet 40 .

In the double-glass assembly, by setting the reflective structure 11 in the gap area of the rear glass cover 10, the reflective structure 11 of the rear cover glass 10 will directionally reflect the sunlight irradiated into the gap area to the front cover glass 20, and then the front cover glass 20 will The reflection of the cover glass 20 to the cell sheet 40 increases the absorption of internally reflected light by the double-glass module, thereby improving the solar light absorption efficiency of the double-glass module and increasing the output power of the double-glass module.

The structure of the double-glass module in the present invention includes, from top to bottom, a front cover glass 20 , an upper packaging adhesive film 30 , a crystalline silicon cell 40 , a lower packaging adhesive film 50 , and a rear cover glass 10 .

Because in the double-glass module, there are front glass cover and rear glass cover 10, and the surface of the glass cover is generally very smooth, it is difficult to fix the position of the cell 40 and the glass cover, and it is easy to occur in the process of module packaging. Therefore, in the present invention, the height of the gap area is designed to be higher than the height of the battery sheet area, so that after the battery sheet 40 is embedded in the battery sheet area, in the process of component packaging, the battery will not occur. The displacement phenomenon of the sheet 40 improves the package quality and efficiency, and ensures the good appearance of the double-glass component. Generally, the thickness of the gap area is equal to the thickness of the battery sheet 40 . It should be noted that the thickness of the gap area mentioned here is equal to the thickness of the battery sheet 40 , which means that after the battery sheet 40 is placed, the top height of the gap area is equal to the top height of the battery sheet 40 .

As for the reflective structure 11, the function of the reflective structure 11 is to directionally reflect the sunlight irradiated into the gap area to the front cover glass 20, and when reflected from the front cover glass 20 to the battery sheet 40, the reflective structure 11 can One or more reflective slopes, one or more reflective curved surfaces, or a combination of reflective slopes or reflective curved surfaces, that is, the reflective structure 11 is at least one reflective slope and/or at least one reflective curved surface. It should be noted that the present invention does not limit the reflective slopes or reflective curved surfaces, the size parameters of multiple reflective slopes can be the same or different, and the parameters of multiple reflective curved surfaces can also be the same or different. A reflective slant or reflective curved surface may refer to a reflective slant or reflective curved surface at the same position, or may be a reflective slant or reflective curved surface at different positions on the double-glass module, which is not specified in the present invention.

Due to the small width of the gap region, generally the adjacent reflective slopes or the reflective curved surfaces intersect. In the double-glass component of the present invention, the top edge of the reflective slope can be parallel to the length direction of the gap region, or perpendicular to the length direction of the gap region or at another angle, or can be arranged in a staggered manner.

In order to reflect as much sunlight irradiated into the gap region as possible, generally the included angle between adjacent reflecting slopes is 60°-120°.

In order to improve the reflection efficiency, a reflective film is generally provided on the reflective structure 11 , that is, the double-glass component also includes a reflective film disposed on the surface of the reflective structure 11 .

In order to reduce the cost of use, generally the reflective film is _TiO2 thin film or AlO thin film.

To sum up, in the double-glass assembly provided by the embodiment of the present invention, by setting a reflective structure in the gap area of the rear glass cover, the reflective structure of the rear cover glass will irradiate the too large part of the gap area The light is directionally reflected to the front cover glass, and then reflected from the front cover glass to the battery sheet, which increases the absorption of internal reflected light by the double-glass module, thereby improving the solar light absorption efficiency of the double-glass module and improving the double-glass module. output power.

The double-glass component provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. a solar double-glass assemblies, it is characterized in that, including back shroud glass, the inner side of described back shroud glass includes cell piece region and gap area, wherein, described gap area includes the gap between the battery strings of the gap between cell piece and multiple described cell piece composition, and described gap area has catoptric arrangement, for being emitted onto the interval sunlight orienting reflex in described gap to front shroud glass, then by described front shroud glass-reflected to described cell piece.

2. solar double-glass assemblies as claimed in claim 1, it is characterised in that the thickness of described gap area is equal to the thickness of described cell piece.

3. solar double-glass assemblies as claimed in claim 1, it is characterised in that described catoptric arrangement is at least one reflecting slant and/or at least one reflecting curved surface.

4. solar double-glass assemblies as claimed in claim 3, it is characterised in that adjacent described reflecting slant or described reflecting curved surface intersect.

5. solar double-glass assemblies as claimed in claim 4, it is characterised in that the angle between adjacent described reflecting slant is 60 °～120 °.

6. solar double-glass assemblies as claimed in claim 5, it is characterised in that also include the reflectance coating being arranged on described reflective structured surface.

7. solar double-glass assemblies as claimed in claim 6, it is characterised in that described reflectance coating is TiO₂Thin film or AlO thin film.