CN221262389U - Solar cell module with high light utilization rate - Google Patents

Abstract

The utility model discloses a solar cell module with high light utilization rate, which comprises a back plate, solar cells arranged on the back plate and a packaging layer arranged on the solar cells, wherein a composite reflection film layer is arranged between the back plate and the solar cells, and a light absorption structure is arranged on the surface of the packaging layer in a concave manner. The solar cell module with high light utilization rate has the characteristics of high reflection light efficiency utilization rate, long service life and strong process operability.

Description

A solar cell component with high light utilization rate

Technical Field

The utility model relates to the technical field of solar cell photovoltaic components, in particular to a solar cell component with high light utilization rate.

Background technique

Photoelectric conversion efficiency is a key indicator of solar cell modules, and improving the photoelectric conversion efficiency of the modules by packaging technology or structure is an important method to improve performance. The packaging layers of traditional glass packaging and dripping glue packaging processes are all planar layered structures. After sunlight irradiates the packaging layer, the transmitted light is effectively utilized, and the reflected light is directly emitted outward, resulting in the waste of solar energy and limiting the improvement of solar energy utilization. Chinese utility model patent CN215771172U discloses a solar cell module with high light utilization, including a solar cell, a graphene film layer is sprayed on one side or both sides of the solar cell, an epoxy resin packaging layer is provided on the surface of the graphene film layer, and a serrated light secondary absorption structure is pressed on the surface of the epoxy resin packaging layer.

From the perspective of mechanism, in this utility model, the sawtooth light secondary absorption structure can form an optical velvet surface on the surface of the epoxy resin encapsulation layer. When a beam of light is projected to an incident point, reflected light and refracted light entering the cell are generated. The reflected light can continue to be projected to another incident point on another sawtooth surface, generating secondary reflected light and refracted light entering the cell, effectively improving the utilization of reflected light. However, only part of the reflected light can be utilized on the optical velvet surface, and because the angle of the sawtooth surface directly affects the secondary incident angle of the reflected light, the secondary utilization rate of the reflected light is only about 11%. There is room for improvement.

Utility Model Content

The utility model aims to provide a solar cell assembly with high light utilization rate, which has the characteristics of high reflected light efficiency utilization rate, long service life and strong process operability.

The utility model can be realized by the following technical solutions:

The utility model discloses a solar cell assembly with high light utilization rate, comprising a back plate, a solar cell sheet arranged on the back plate, and a packaging layer arranged on the solar cell sheet. A composite reflective film layer is arranged between the back plate and the solar cell sheet, and a light absorbing structure is arranged in a concave manner on the surface of the packaging layer.

Furthermore, the composite reflective film layer includes a polyolefin film layer and an aluminum film layer coated on the surface thereof. The aluminum film layer can be provided by vacuum evaporation, and its reflectivity for light is as high as more than 95%, which effectively ensures the utilization rate of light.

Furthermore, the light absorption structure is a plurality of adjacently arranged isosceles trapezoidal opening structures, wherein the width of the upper bottom opening is smaller than the width of the lower bottom. By forming an isosceles trapezoidal structure, light rays of different angles can be incident from the upper bottom of the narrow opening and confined inside the trapezoidal structure, and can be effectively absorbed after multiple reflections and refractions.

Furthermore, in the isosceles trapezoidal opening structure, the angle between the waist and the lower base is 30° to 60°, forming a better inclined space to prevent the light incident on the trapezoidal structure from emitting outwards as much as possible.

Furthermore, a protective layer is provided on the surface of the aluminum film layer, and the protective layer is a siloxane coating, a self-cleaning coating and/or an anti-scratch coating, which ensures that it has good weather resistance and improves service life.

Furthermore, the thickness of the protective layer is 1-5 μm, which not only has a good protective effect but also avoids the influence on light transmission due to excessive thickness.

Furthermore, in the isosceles trapezoidal opening structure, the inner walls of the two waists are coated with an internal reflection coating, and the thickness of the internal reflection coating is 1-5 μm, which has a good protection effect and avoids the influence on light transmission due to excessive thickness.

Furthermore, a semicircular concave structure is provided at the connection between adjacent isosceles trapezoidal opening structures, so as to fully utilize the space on the surface of the packaging layer and improve the light utilization rate.

Furthermore, the solar cell is a monocrystalline silicon solar cell or a polycrystalline silicon solar cell, which can be flexibly selected according to actual conditions.

Furthermore, the encapsulation layer is an epoxy resin encapsulation layer or a polyurethane encapsulation layer, both of which have high transparency and good encapsulation effect.

The solar cell assembly of the utility model has high light utilization rate and has the following beneficial effects:

First, the utilization rate of reflected light is high. Through the concave light absorption structure and the composite reflective film layer, the incident light is effectively confined inside the light absorption structure, and after multiple reflections and refractions, it is finally effectively absorbed, which improves the utilization of reflected light and the utilization rate of solar energy.

Second, long service life. The composite reflective film layer is arranged between the back plate and the solar cell, and is closely combined with the two, so as to avoid the influence of direct light exposure on the outer layer on its weather resistance, thereby extending its service life.

Third, the process is highly operable. By setting the light absorbing structure on the surface of the encapsulation layer, the existing technology in which the encapsulation layer is mostly made of injection molding materials can be fully utilized to achieve molding control.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a solar cell assembly embodiment 1 of the utility model with high light utilization rate;

The reference numerals include: 1, back plate; 2, composite reflective film layer; 3, solar cell; 4, packaging layer; 21, polyolefin film layer; 22, aluminum film layer; 23, protective layer; 41, light absorbing structure; 42, concave structure.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the embodiments and drawings.

As shown in Figure 1, the utility model discloses a solar cell assembly with high light utilization rate, including a backplane 1, a solar cell 3 arranged on the backplane 1, and an encapsulation layer 4 arranged on the solar cell 3, a composite reflective film layer 2 is arranged between the backplane 1 and the solar cell 3, and a light absorption structure 41 is arranged in a concave shape on the surface of the encapsulation layer 4.

As shown in FIG. 1 , in terms of specific structure, the composite reflective film layer 2 includes a polyolefin film layer 21 and an aluminum film layer 22 coated on its surface. A protective layer 23 is also provided on the surface of the aluminum film layer 22. The protective layer is a silicone coating, a self-cleaning coating and/or an anti-scratch coating, and the thickness of the protective layer is 1-5 μm.

In the absorption structure, as shown in FIG1 , the light absorption structure 41 is a plurality of adjacent isosceles trapezoidal opening structures, the width of the upper bottom opening of which is smaller than the width of the lower bottom. At the same time, a semicircular concave structure 42 is provided at the connection between the adjacent isosceles trapezoidal opening structures. Specifically, in the isosceles trapezoidal opening structure, the angle between the waist and the lower bottom is 30° to 60°.

In the present invention, in order to ensure the utilization rate of light, in the isosceles trapezoidal opening structure, the inner walls of the two waists are coated with an internal reflection coating, and the thickness of the internal reflection coating is 1-5 μm.

In the present invention, the selection of solar cells and packaging layers is relatively flexible. The solar cells are monocrystalline silicon solar cells or polycrystalline silicon solar cells. The packaging layer is an epoxy resin packaging layer or a polyurethane packaging layer.

In the present invention, compared with the prior art CN215771172U in which about 11% of the secondary reflected light may undergo a third reflection and refraction, the reflected light of the present invention is effectively reduced and fully utilized, and the light in the light absorbing structure is basically fully utilized after multiple reflections and refractions.

The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model according to the drawings shown in the specification and the above description. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the utility model, which are all equivalent embodiments of the utility model. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims (10)

1. A solar cell assembly with high light utilization rate, comprising a backplane, a solar cell arranged on the backplane, and an encapsulation layer arranged on the solar cell, characterized in that a composite reflective film layer is arranged between the backplane and the solar cell, and a light absorbing structure is arranged in a concave manner on the surface of the encapsulation layer. 2. The solar cell assembly with high light utilization efficiency according to claim 1, characterized in that the composite reflective film layer comprises a polyolefin film layer and an aluminum film layer plated on the surface thereof. 3. The solar cell assembly with high light utilization rate according to claim 2, characterized in that: the light absorption structure is a plurality of adjacently arranged isosceles trapezoidal opening structures, and the width of the upper bottom opening is smaller than the width of the lower bottom. 4. The solar cell assembly with high light utilization rate according to claim 3, characterized in that: in the isosceles trapezoidal opening structure, the angle between the waist and the lower base is 30° to 60°. 5. The solar cell assembly with high light utilization rate according to claim 4 is characterized in that a protective layer is also provided on the surface of the aluminum film layer, and the protective layer is a siloxane coating, a self-cleaning coating and/or an anti-scratch coating. 6. The solar cell assembly with high light utilization rate according to claim 5, characterized in that the thickness of the protective layer is 1-5 μm. 7. The solar cell assembly with high light utilization rate according to claim 6, characterized in that: in the isosceles trapezoidal opening structure, the inner walls of the two waists are coated with an internal reflection coating, and the thickness of the internal reflection coating is 1-5 μm. 8. The solar cell assembly with high light utilization rate according to claim 7, characterized in that a semicircular concave structure is provided at the connection between adjacent isosceles trapezoidal opening structures. 9. The solar cell assembly with high light utilization rate according to claim 8, characterized in that the solar cell is a single crystal silicon solar cell or a polycrystalline silicon solar cell. 10 . The solar cell assembly with high light utilization rate according to claim 8 , wherein the encapsulation layer is an epoxy resin encapsulation layer or a polyurethane encapsulation layer.