CN105490636B - For the reflector of two-sided photovoltaic module and the photovoltaic system of application reflector - Google Patents

Abstract

The invention provides a reflector for a double-sided photovoltaic module and a photovoltaic system using the reflector, the reflector reflects sunlight to the lower surface of the double-sided photovoltaic module, and the reflector faces the double-sided The part of the lower surface of the photovoltaic module is a reflective surface. A photovoltaic system using a reflector, the photovoltaic system includes one or more of the reflectors; the photovoltaic system has the same number of double-sided photovoltaic modules as the applied reflectors, and each of the reflectors is arranged on the The reflective surface of the reflector receives sunlight and reflects it to the lower surface of the double-sided photovoltaic module. The invention can reduce the usage area of the double-sided photovoltaic module, improve the utilization rate of the double-sided photovoltaic module and reduce the production cost.

Description

Reflectors for double-sided photovoltaic modules and photovoltaic systems using reflectors

technical field

The invention relates to the field of production capacity of solar photovoltaic cells, in particular to a reflector for a double-sided photovoltaic module and a photovoltaic system using the reflector.

Background technique

With the development of society and science and technology, the production technology of solar panels has been continuously improved, and has been widely used in various fields. Solar photovoltaic cells (referred to as photovoltaic cells) are devices that directly convert light energy into electrical energy through the photoelectric effect or photochemical effect. It is a solar battery combination device with packaging and internal connection that can provide direct current output alone, and the solar panel is the core part of the solar power generation system, and it is also the most valuable part of the solar power generation system. Not only can the solar energy be converted into electrical energy, or sent to the storage battery for storage, or to promote the load to work.

The electric energy generated by the battery mainly depends on the photon energy incident on the battery. At present, in order to solve the problem of low power generation efficiency of photovoltaic power generation products, it is mainly to replace the commonly used single-sided photovoltaic cells with double-sided photovoltaic modules and use double-sided photovoltaic modules. The front and back sides of the solar cell receive incoming solar photons at the same time, thereby increasing electrical energy production.

However, the production cost of double-sided photovoltaic modules is high, and the utilization rate of the reverse side is low, thus causing greater economic pressure on application companies. How to effectively utilize the front and back sides of the double-sided photovoltaic module, on the basis of reducing the use area of the double-sided photovoltaic module, ensure the power output, and effectively reduce the production cost has always been a problem to be solved by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a reflector for a double-sided photovoltaic module, which can increase the utilization rate of the double-sided photovoltaic module and reduce production costs on the basis of reducing the use area of the double-sided photovoltaic module.

The technical scheme provided by the invention is as follows:

A reflector for a double-sided photovoltaic module, comprising:

The reflector reflects sunlight toward the lower surface of the double-sided photovoltaic module, and the part of the reflector facing the lower surface of the double-sided photovoltaic module is a reflective surface.

In this technical solution, through the reflector facing the reflection surface of the lower surface of the double-sided photovoltaic module, the reflection surface can concentrate sunlight from all directions in the direction that needs to be reflected, which can reduce the use area of the double-sided photovoltaic module and improve the double-sided photovoltaic module. The utilization rate of surface photovoltaic modules reduces production costs.

Preferably, the reflector includes a bottom plate and side walls surrounding the bottom plate, the diameter of the side wall near the bottom plate is smaller than the diameter of the other side;

Both the bottom plate and the inner wall of the side wall are the reflective surfaces.

In this solution, the overall structure of the reflector is trumpet-shaped (the diameter of the side wall close to the bottom plate is smaller than the diameter of the other side). In addition to improving the intensity and uniformity of the reflected light, it can also expand the reflection range. By adjusting the angle of the horn mouth The adjustment of the reflection range can be realized.

Preferably, the side wall is formed by connecting multiple side plates, the side plates are in the shape of a flat plate or an arc plate, and the length of the side of the side plate close to the bottom plate is smaller than that of the opposite side;

Every two adjacent side plates are connected by an arc surface, and the arc surface is fan-shaped.

The reflector is set to be composed of a plurality of side plates connected, and the arc-shaped surface formed between the side walls can make the inner wall of the reflector polygonal, and at the same time each surface is arc-shaped transition to avoid dead angles that cause reception The sunlight is reduced, which in turn reduces the photon energy received by the bifacial photovoltaic module.

Another object of the present invention is to apply the above-mentioned photovoltaic system for the reflector of the double-sided photovoltaic module, comprising:

one or more of said reflectors;

The same number of double-sided photovoltaic components as the applied reflectors, each of the reflectors is arranged directly under the double-sided photovoltaic components, and the reflective surface of the reflector receives sunlight and reflects it to the double-sided photovoltaic components on the lower surface of the photovoltaic module.

In this solution, the reflector and the double-sided photovoltaic module using multiple reflectors make the technical solution of the present invention applicable to double-sided photovoltaic cell systems with various electric energy outputs. When the required electric energy output is small, relatively large The required production capacity can be achieved with a small number of double-sided photovoltaic modules, which can effectively reduce the use area of double-sided photovoltaic modules under the condition of the same required power output, thereby reducing production costs. In addition, in addition to improving the intensity and uniformity of reflected light, the horn-shaped reflector can also form a reflection angle for the light reflected to the lower surface of the double-sided photovoltaic module, covering the part of the lower surface that cannot be exposed to sunlight. In practical application, as long as the angle of the horn mouth is adjusted, the adjustment of the reflection angle can be realized, so that the lower surface of the double-sided photovoltaic module can receive light irradiation, thereby improving the utilization rate.

Preferably, the cross-section of the double-sided photovoltaic module is circular or square, and conforms to the contour around the bottom plate, so that the side wall surrounds the double-sided photovoltaic module.

The profile around the bottom plate of the reflector is consistent with the cross-section of the double-sided photovoltaic module, so that the side walls can be distributed around the double-sided photovoltaic module, and the geometric center of each side plate is on the lower surface of the double-sided photovoltaic All the incoming sunlight is reflected to the lower surface of the double-sided photovoltaic module, which can make the reflected sunlight evenly enter from different directions.

Preferably, the height of the reflector is the first height h1;

The distance between the edge of the double-sided photovoltaic module and the edge of the side wall of the reflector away from the bottom plate is a first length S1; the distance between the geometric center of the double-sided photovoltaic module and the edge is a second length. length S2;

The first height h1<S1<S2.

Setting the first height to be smaller than the first length, while the first length is smaller than the second length, can ensure that the lower surface of the double-sided photovoltaic module can receive sunlight, and avoid excessive use of a part of the double-sided photovoltaic module , while the other part cannot be fully utilized, reducing the utilization rate of double-sided photovoltaic cell modules.

Preferably, the distance between the lower surface of the double-sided photovoltaic module and the bottom plate is a second height h2, and h2=h1.

The fact that the first height is consistent with the second height can improve the utilization rate of the reflective surface of the reflector, so that all sunlight received on the reflective surface is reflected to the lower surface of the double-sided photovoltaic module after being reflected.

Further preferably on the basis of the above, a first protective layer is provided above the double-sided photovoltaic module, a second protective layer is provided under the bottom plate of the reflector, and the first protective layer and the second protective layer The connection constitutes an accommodating space for accommodating the double-sided photovoltaic module and the reflector.

The set protective layer can protect the double-sided photovoltaic modules and reflectors, which can ensure that the sunlight is not affected and at the same time prolong the service life of the entire photovoltaic system.

Preferably, both upper and lower surfaces of the first protective layer and the second protective layer are plane.

Setting the upper and lower surfaces of the two protective layers as planes can avoid affecting the incident angle of sunlight, and can make the whole structure compact, beautiful, and easy to install and place.

Preferably, both the first protective layer and the second protective layer are ultra-clear tempered glass or plastic.

The main reason is that ultra-white tempered glass or plastic has good light transmission and wear resistance, and will not be rusted by rainwater, and has good impact resistance.

The reflector for double-sided photovoltaic modules and the photovoltaic system using the reflector provided by the present invention can bring at least one of the following beneficial effects:

1. The reflector in the present invention faces the reflective surface of the lower surface of the double-sided photovoltaic module. The reflective surface can concentrate sunlight from all directions in the direction that needs to be reflected, which can reduce the use area of the double-sided photovoltaic module and effectively improve the double-sided photovoltaic module. The utilization rate of surface photovoltaic modules reduces production costs.

2. In the present invention, the reflector is in the shape of a trumpet, and under the condition of the same required power output, the use area of the double-sided photovoltaic module is effectively reduced, thereby reducing the production cost.

3. In the present invention, the side wall is connected by the side plate and the fan-shaped arc surface, which can make the entire side wall transition into an arc, improve the incident intensity of received sunlight, and further increase the photon energy received by the double-sided photovoltaic module.

4. The photovoltaic system using the reflector in the present invention directly installs the reflector under the double-sided photovoltaic module, which not only solves the problem that the lower surface of the double-sided photovoltaic module cannot import light energy, but also ensures that the sun can be evenly received. The incidence of light, the effect of electric energy production is better.

5. The photovoltaic system using the reflector in the present invention, through the special arrangement of the double-sided photovoltaic modules, can realize that the double-sided photovoltaic modules have reflective surfaces distributed around them, so that the lower surfaces of the double-sided photovoltaic modules can receive reflected light.

6. The first protective layer and the second protective layer further provided in the present invention can protect double-sided photovoltaic modules and reflectors. The producer can assemble it and install it directly by the installer, which simplifies the installation procedure.

7. The present invention not only does not affect the relationship and manufacturing process of other components such as double-sided photovoltaic modules and reflectors, but also has a simple structure, effectively reduces production costs, and expands the scope of application.

Description of drawings

In the following, preferred embodiments will be described in a clear and understandable manner with reference to the accompanying drawings, and the above-mentioned characteristics, technical features, advantages and implementation methods of the reflector for double-sided photovoltaic modules and the photovoltaic system using the reflector will be further described.

Fig. 1 is a schematic structural view of a reflector used in double-sided photovoltaic modules according to the present invention;

Fig. 2 is a structural schematic diagram in another direction of Fig. 1;

Fig. 3 is the front view of the double-sided photovoltaic module in the photovoltaic system using the reflector of the present invention;

Fig. 4 is a diagram of the use state of the photovoltaic system using the reflector of the present invention.

Explanation of reference numbers:

first height h1; second height h2; first length S1; second length S2;

reflector 100; reflective surface 101; bottom plate 102; side wall 103; side plate 1031; arc surface 1032;

Double-sided photovoltaic module 200;

a first protective layer 300;

second protective layer 400;

Accommodating space 500.

Detailed ways

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

In order to make the drawing concise, the parts related to the present invention are only schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of the usage modes is marked. In this article, "one" not only means "only this one", but also can mean "more than one"; in addition, the icon uses a straight line with an arrow to enter the direction of light.

In an embodiment of the present invention, as shown in Fig. 1 and 2, a reflector for a double-sided photovoltaic module, the reflector 100 reflects sunlight to the lower surface of the double-sided photovoltaic module 200, and the reflector 100 faces the double-sided photovoltaic module 200 The part of the lower surface of the planar photovoltaic module 200 is the reflective surface 101 . In practical application, the reflector 100 can be made of mirror material, so that it can produce a diffuse reflection effect. High-purity aluminum plates can also be used, and the upper surface can be polished and coated with high-reflectivity silver polyester film to achieve the reflection effect. The specific production method is not limited, and can be selected according to specific needs.

In this embodiment, as shown in FIGS. 1 and 2 , the reflector 100 includes a bottom plate 102 and side walls 103 surrounding the bottom plate 102 . Wherein, the aperture of the side wall 103 near the bottom plate 102 is smaller than the aperture of the other side, so that the reflector 100 forms a trumpet shape (that is, expanding gradually from the bottom plate 102 side to the side wall 103 side), and the bottom plate 102 and the side wall The inner walls of 103 are all set as reflective surfaces 101 . In this way, the sunlight incident on the reflective surface 101 can be collected and reflected concentratedly, the reflectivity can be improved, and the power production capacity of the double-sided photovoltaic module 200 can be improved at the same time.

In this embodiment, the set bottom plate 102 can be circular, square or polygonal. For example, the bottom plate 102 is circular, and the side wall 103 is directly composed of an integral side plate 1031. When the bottom plate 102 is square or polygonal , the side wall 103 may be composed of a plurality of side plates 1031 . As shown in Figures 1 and 3, the base plate 102 is preferably a square in the present application, and the side wall 103 is composed of four side plates 1031, and the side length of the side plate 1031 near the base plate 102 is smaller than the opposite side; and every two Two adjacent side plates 1031 are connected by an arc surface 1032 . Wherein, the side plate 1031 is in the shape of a flat plate or an arc plate, and the arc plate can be a parabolic structure or a free-form surface structure. The arc surface 1032 is fan-shaped, and the specific fan-shaped arc surface 1032 is gradually expanding (that is, the side near the bottom plate 102 is smaller than the other side), and the purpose is to make the trumpet-shaped side wall 103 arc-shaped Transition, to avoid the impact of dead angle on the reception of sunlight.

In another embodiment of the present invention, referring to FIG. 4 , there is provided a usage state diagram of a photovoltaic system using the reflector 100 in the above embodiment. The photovoltaic system includes one or more reflectors 100, and the photovoltaic system consists of double-sided photovoltaic modules 200 with the same number as the reflectors 100, and each reflector 100 is arranged under the double-sided photovoltaic modules 200 (generally directly below ), and then use the reflecting surface 101 of the reflector 100 to receive sunlight and reflect it to the lower surface of the double-sided photovoltaic module 200, so that the lower surface of the double-sided photovoltaic module 200 can receive sunlight, thereby ensuring that the double-sided The lower surface of the photovoltaic module 200 can be fully utilized.

It should be noted that, referring to FIG. 3 , the double-sided photovoltaic module 200 has a circular or square cross section, which is specifically set according to the shape of the bottom plate 102 of the reflector 100. The main purpose is to make the side wall 103 surround the double-sided photovoltaic module. The surroundings of the module 200 ensure that all the reflected light can be absorbed by the lower surface of the double-sided photovoltaic module 200 . Of course, in other embodiments, in order to ensure that the lower surfaces of the double-sided photovoltaic modules 200 with different structures can all receive sunlight, the sizes (used areas) of the two must be set to be consistent.

In another embodiment of the present invention, the circular, square or polygonal double-sided photovoltaic modules 200 can be directly arranged in a specific shape for each double-sided photovoltaic module 200, or multiple double-sided photovoltaic modules can be formed. 200 spliced compositions. Furthermore, in order to improve the utilization rate of the entire double-sided photovoltaic module 200, the height of the reflector 100 is further set to be the first height h1, and the edge of the double-sided photovoltaic module 200 (specifically, the contour around the cross section) to the point where the reflector 100 is away from the bottom plate 102 The distance between the edges of the side walls 103 (that is, the longer side of the side plate 1031 away from the bottom plate 102) is the first length S1; the geometric center of the double-sided photovoltaic module 200 to the edge (specifically the cross-sectional The distance between the surrounding contours) is the second length S2. Wherein, the first height h1 is set to be greater than S1, and S1 must be greater than S2, and it is only necessary to ensure that the geometric center of each side plate 1031 is on the lower surface of the double-sided photovoltaic module 200 .

The main function of the set reflector 100 is to reflect the received sunlight to the lower surface of the double-sided photovoltaic module 200, so in order to ensure the reflection efficiency of the reflector 100 and ensure that the reflected light can be fully utilized, so further The distance between the lower surface of the double-sided photovoltaic module 200 and the bottom plate 102 is a second height h2, and h2 is set to be equal to the height h1. Of course, in other embodiments, in order to further reduce the use area of the double-sided photovoltaic cell 200 , the curvature of the side plate 1031 can be further increased, as long as the performance of the lower surface of the double-sided photovoltaic cell 200 is acceptable.

On the basis of the embodiments used above, in order to prolong the service life of the entire photovoltaic cell assembly, a first protective layer 300 is further provided above the double-sided photovoltaic assembly 200, and a second protective layer is provided below the bottom plate 102 of the reflector 100 400. In practice, the first protective layer 300 and the second protective layer 400 can be connected to form an accommodating space 500 for accommodating the double-sided photovoltaic module 200 and the reflector 100 . Among them, the circular, square or polygonal multiple double-sided photovoltaic modules 200 that constitute the photovoltaic system can be directly connected, or the multiple double-sided photovoltaic modules 200 can be fixed by an external mounting frame (not shown in the figure). . Of course, in other embodiments, the accommodating space 500 can be sealed, and a certain distance is left between the first protective layer 300 and the upper surface of the double-sided photovoltaic module 200 , while the second protective layer 400 and the bottom plate of the reflector 100 The bottom surface of 102 is fixed, and the second protective layer 400 can also be directly used as the bottom plate 102. There are many specific usage methods, which will not be repeated in this application.

In this application, the upper and lower surfaces of the first protective layer 300 and the second protective layer 400 are set as planes, and ultra-clear tempered glass or Made of plastic material. While being able to protect, it can also not affect the angle of sunlight irradiation.

It should be noted that the above embodiments can be freely combined as required. The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (5)

1. a kind of photovoltaic system of reflector for two-sided photovoltaic module, it is characterised in that：

One or more reflectors；

The reflector reflects sunray to the lower surface of the two-sided photovoltaic module, and the reflector is towards described two-sided The part of photovoltaic module lower surface is reflecting surface；

The reflector includes a bottom plate and is disposed around the side wall of the bottom plate surrounding, and the side wall is close to the bottom plate side Bore is less than other side bore；

The bottom plate and the side wall inner wall are the reflecting surface；

The side wall is connected and composed by multiple side plates, and the side plate is tablet or cambered surface plate, and the side plate is close to the bottom The edge lengths of plate side are less than opposite side；

It is connected by arcwall face between each two adjacent side plates, the arcwall face is fan shape；

The two-sided photovoltaic module of quantity identical as the reflector of application, each reflector are set to the two-sided photovoltaic Below component, the reflecting surface of the reflector receives sunray, and reflexes on the lower surface of the two-sided photovoltaic module；

The height of the reflector is the first height h1；

The two-sided photovoltaic module edge to the distance between sidewall edge of the reflector far from the bottom plate side is the One length S1；The geometric center of the two-sided photovoltaic module to the distance between edge is the second length S2；

The first height h1< S1< S2；

The two-sided photovoltaic module lower surface to the distance between the bottom plate is the second height h2, and h2=h1.

2. the photovoltaic system of the reflector according to claim 1 for two-sided photovoltaic module, it is characterised in that：

The two-sided photovoltaic module transverse section is rounded or square structure, and consistent with the bottom plate surrounding profile so that described Side wall is looped around the two-sided photovoltaic module surrounding.

3. the photovoltaic system of the reflector according to claim 1 for two-sided photovoltaic module, it is characterised in that：

It is equipped with the first protective layer above the two-sided photovoltaic module, the second protective layer, institute are equipped with below the bottom plate of the reflector It states the first protective layer and second protective layer connects and composes an accommodating sky for housing the two-sided photovoltaic module, the reflector Between.

4. the photovoltaic system of the reflector according to claim 3 for two-sided photovoltaic module, it is characterised in that：

First protective layer and the upper and lower surface of the second protective layer are plane.

5. the photovoltaic system of the reflector according to claim 3 for two-sided photovoltaic module, it is characterised in that：

First protective layer and second protective layer are ultrawhite tempered glass or plastics.