CN105355672A - Application device for double-sided photovoltaic cells - Google Patents

Abstract

The invention provides an application device of a double-sided photovoltaic cell. The device includes a first protective layer and a reflective layer arranged in sequence from top to bottom in the direction of sunlight incidence, and a first protective layer and a reflective layer arranged on the first protective layer and the reflective layer. A plurality of double-sided photovoltaic cells between the layers; a grating plate is arranged between adjacent double-sided photovoltaic cells, and the grating plate receives the sunlight transmitted by the first protective layer, and according to the different incident angles of light respectively reflected on the upper surface of the double-sided photovoltaic cell and the reflective layer, and the reflective layer reflects the received light to the lower surface of the double-sided photovoltaic cell. The invention realizes reflection of sunlight incident from different angles through the grating plates arranged between adjacent double-sided photovoltaic cells. It can guide the light that cannot be directly received by the upper surface of the double-sided photovoltaic cell to the upper surface, or even better guide it to the lower surface of the double-sided photovoltaic cell, enhance the light energy introduced to both sides of the battery, and improve the utilization rate of the double-sided photovoltaic cell .

Description

Application device of double-sided photovoltaic cells

technical field

The invention relates to the field of production capacity of solar photovoltaic cells, in particular to an application device of double-sided photovoltaic cells.

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 is mainly determined by the photon energy incident on the battery, but the current photovoltaic power generation products still have the problem of low power generation efficiency. The use of light is less, so that the light energy of the sun cannot be fully utilized.

How to obtain more solar energy on a limited area has always been a problem to be solved by those skilled in the art. In the past, solar panels were formed by sequentially stacking layers of different materials, so as to increase the performance of the solar panel and improve the utilization of solar energy. Although this stacking method can obtain more solar energy, the multiple material layers will inevitably increase the manufacturing cost of the battery sheet and the yield rate will be low, and the structure of the entire photovoltaic battery panel is more complicated, and the finished product is heavier. It is even more unfavorable for installers to install. Therefore, the technicians of the present application urgently need to design an application device that has a high utilization rate of the battery board, is low in cost, and is easy to install.

Contents of the invention

The purpose of the present invention is to provide an application device for double-sided photovoltaic cells, which can guide the sunlight that cannot be directly received by the upper surface of the double-sided photovoltaic cell into the upper surface, or even better into the lower surface of the double-sided photovoltaic cell. Enhance the light energy imported to both sides of the battery, and improve the utilization rate of double-sided photovoltaic cells.

The technical scheme provided by the invention is as follows:

Applied devices for bifacial photovoltaic cells, including,

The sunlight incident direction is sequentially provided with a first protection layer and a reflective layer for receiving sunlight rays and reflecting them, and a plurality of double-layers arranged between the first protection layer and the reflection layer. surface photovoltaic cells;

A grating plate is arranged between adjacent double-sided photovoltaic cells, and the grating plate receives sunlight transmitted through the first protective layer and reflects it to the sides of the double-sided photovoltaic cells according to different incident angles of light. On the upper surface and on the reflective layer, the reflective layer reflects the received light to the lower surface of the double-sided photovoltaic cell.

In this technical solution, a plurality of double-sided photovoltaic cells are specifically arranged between the first protective layer and the reflective layer, and then through the grating plate arranged between adjacent double-sided photovoltaic cells, the diffraction of the grating plate is used to realize the The light transmitted through the first protective layer is guided to the upper surface of the double-sided photovoltaic cell and the reflective layer, and then the reflective layer reflects the received light to the lower surface of the double-sided photovoltaic cell to enhance the light energy introduced into the surface of the battery. Improve the utilization rate of double-sided photovoltaic cells.

Preferably, it also includes a second protective layer disposed opposite to the reflective layer, and a second protective layer is formed between the second protective layer and the first protective layer for accommodating the double-sided photovoltaic cell and the grating. plate, and the accommodating space for the reflective layer.

A second protective layer is additionally arranged on the back of the reflective layer, the purpose is to form an accommodating space between the second protective layer and the first protective layer, and further protect the double-sided photovoltaic cells and grating plates and the reflective layer arranged in the accommodating space. Realize protection, prevent the overall service life of each component from being affected by external rain or hard objects, and improve the reflection effect of the reflective layer at the same time.

In the above technology, preferably, the reflective layer is a second protective layer, and the inner surface of the second protective layer facing the side of the double-sided photovoltaic cell is coated with a reflective coating.

The reflective layer is directly set as the second protective layer, and the special treatment of the inner surface of the second protective layer also realizes the function of reflecting the received sunlight, which not only has a simple structure, but also simplifies the installation procedure.

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

Both the upper and lower surfaces of the first protective layer and the second protective layer are flat. Ensure that the sun's rays can directly strike the upper and lower surfaces of the double-sided photovoltaic cell. Even if there is a certain refraction due to the influence of the production material, it will be reflected on the upper and lower surfaces of the double-sided photovoltaic cell by the set grating layer and the reflective layer. At the same time, the upper and lower surfaces are both flat, making the overall shape smooth and beautiful.

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

In this technical solution, both the first protective layer and the second protective layer are ultra-white tempered glass or plastic, which can protect the double-sided photovoltaic cells, gratings, and reflective layers in the accommodation space between the two protective layers. At the same time, all the sunlight within a certain range can be injected into the surface area of the double-sided photovoltaic cell, and the light energy is converted into electrical energy, so that the limited area of the double-sided photovoltaic cell can be optimally utilized.

Further preferably on the basis of the above technology, it also includes a fixing bracket for fixing the double-sided photovoltaic module, the fixing bracket is located on opposite sides of the double-sided photovoltaic module, and is provided with a certain height so that the A certain distance is maintained between the double-sided photovoltaic module and the reflective layer.

The fixed bracket not only solves the problem of fixing the smooth photovoltaic module, but also keeps a certain distance between the photovoltaic panel and the reflective layer through the fixed bracket of a certain height, so as to avoid the too close distance between the two to affect the reflection of the reflected light Distance and reflection effects.

Preferably, the width of the double-sided photovoltaic cell is the first width d1;

The width of the grating plate is the second width d2;

The second width d2 is between 0.5d1˜0.8d1.

This technical solution, through the limitation of different widths, can ensure that the light incident from the grating plate with a certain width can be fully converged on the surface of the double-sided photovoltaic cell, and ensure that all the light on the surface of the grating plate is reflected to the double-sided photovoltaic cell On the upper surface or the lower surface, the utilization rate of double-sided photovoltaic cells is improved.

Further preferably, the upper surface of the grating plate is a plane, and the lower surface is composed of a first slope and a second slope for respectively reflecting sunlight to adjacent double-sided photovoltaic cells, the first slope and The inclination directions of the second slopes are opposite.

The upper surface of the grating plate is set as a plane, while the lower surface is composed of two slopes, which can meet the requirement that the sun’s rays entering from the first protective layer directly hit the upper surface of the grating plate, and the light passes through the upper surface of the plane and is formed The lower surfaces of the two slopes reflect at different angles. At the same time, the inclination directions of the two slopes are opposite, which can ensure that the reflected light is incident on the surface of the adjacent double-sided photovoltaic cell. Solve the problem that the lower surface of the double-sided photovoltaic cell cannot receive sunlight.

Preferably, the included angles between the first slope and the second slope and the upper surface of the grating plate are less than 90 degrees;

Both the first slope and the second slope are composed of a plurality of surfaces with the same slope angle, and the two slopes have the same size.

The included angles between the two slopes and the upper surface are set to be less than 90 degrees, and can be composed of multiple surfaces with the same slope angle, while ensuring that the two slopes have the same size. The purpose is to make the sunlight received on the light board evenly reflect to the back of the adjacent smooth photovoltaic panel.

Preferably, the grating plate is a thin-film transmission grating.

The diffraction phenomenon is realized through the thin film transmission grating, which satisfies the function of reflecting the sun's rays.

The application device of the double-sided photovoltaic cell provided by the present invention brings at least one of the following advantages:

1. The present invention utilizes the grating plate arranged between adjacent double-sided photovoltaic cells to realize the sunlight transmitted through the first protective layer through the diffraction phenomenon of light, and reflected to the upper and lower surfaces of the double-sided photovoltaic cells to improve Electric energy production on limited area of bifacial photovoltaic cells.

2. The upper surface of the double-sided photovoltaic cell of the present invention can still directly receive sunlight through the first protective layer and convert it into electrical energy. Problems with surfaces not converging on light.

3. In the present invention, the reflective layer is directly set as a protective layer. By coating the inner surface of the protective layer with a reflective coating, not only the function of reflection can be realized, but also the lower surface of the double-sided photovoltaic cell can be protected. To achieve a dual-purpose role.

4. In the present invention, a protective layer is preferably arranged on the back of the reflective layer, through the accommodation space formed between the two protective layers, and then protects all components in the accommodation space, extending the entire application device and double-sided The lifetime of photovoltaic cells.

6. In the present invention, while fixing the double-sided photovoltaic cell through the fixed bracket, a certain distance is kept between the double-sided photovoltaic cell and the reflective layer to avoid affecting the reflection effect.

7. In the present invention, the structure of the grating is reasonably designed, so that the light contacted by the surface of the grating can be reflected to the lower surface of different double-sided photovoltaic cells according to requirements.

8. The present invention not only does not affect the relationship and manufacturing process of other components such as double-sided photovoltaic cells, reflective layers or gratings, but also has simple structure, reliable installation, convenient production and installation, and low production cost.

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 application device of double-sided photovoltaic cells will be further described.

Fig. 1 is the schematic diagram of a kind of embodiment of the application device of double-sided photovoltaic cell of the present invention;

Fig. 2 is the schematic diagram of two kinds of embodiments of the application device of double-sided photovoltaic cell of the present invention;

Fig. 3 is a schematic cross-sectional view of the grating in the application device of the double-sided photovoltaic cell of the present invention;

Fig. 4 is a schematic diagram of the application of the grating in the application device of the double-sided photovoltaic cell of the present invention;

Fig. 5 is a schematic diagram of another application of the grating in the application device of the double-sided photovoltaic cell of the present invention.

Explanation of reference numbers:

first width d1; second width d2;

1. Double-sided photovoltaic cells; 10. Accommodating space;

101. The first double-sided photovoltaic cell; 102. The second double-sided photovoltaic cell;

2, the grating plate; 21, the upper surface of the grating plate; 22, the lower surface of the grating plate; 221, the first slope; 222, the second slope; 223, the angle of inclination;

3. Reflective layer;

4. The first protective layer;

5. The second protective layer; 501. The inner surface;

6. Fix the bracket.

detailed description

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 one", but also "more than one"; in addition, the icon uses a straight line with an arrow to indicate the direction of the sun's rays.

In Embodiment 1 of the present invention, as shown in FIG. 1 , the application of the double-sided battery module device includes a first protective layer 4 sequentially provided from top to bottom in the direction of sunlight incident, which is used to receive sunlight and reflect it. A reflective layer 3, and a double-sided photovoltaic cell 1 arranged between the first protective layer 4 and the reflective layer 3. Among them, the number of double-sided photovoltaic cells 1 is multiple, and a grating plate 2 is arranged between adjacent double-sided photovoltaic cells 1 at the same time, and the purpose of setting the grating plate 2 is to pass through the first protective layer 4 Sunlight is reflected on the surface of the double-sided photovoltaic cell and on the reflective layer 3 according to the different light angles. Wherein, the light received on the reflective layer 3 is directly reflected to the lower surface of the double-sided patronizing battery. The device realizes that both the upper and lower surfaces of the double-sided photovoltaic cell can receive sunlight at different angles, thereby increasing the output of electric energy.

In this embodiment, in order to improve the service life of the overall device, it further includes a second protective layer 5 arranged opposite to the reflective layer 3, so that the second protective layer 5 and the first protective layer 4 are formed between the second protective layer 5 and the first protective layer 4 for accommodating The double-sided photovoltaic cell 1, the grating plate 2, and the accommodating space 10 for the reflective layer 3 are placed. Wherein, the accommodating space 10 can be open or closed, and the surface of the reflective layer 3 and the second protective layer 5 can be directly connected, or can be separated by a certain gap, as long as it is guaranteed to be protected without affecting the sun. Just let the light come in.

In Embodiment 2 of the present invention, as shown in FIG. 2 , the difference from Embodiment 1 is that the reflective layer 3 can be directly used as the second protective layer 5 . One side of the inner surface 501 is coated with a reflective coating, and the reflective coating achieves the effect of reflecting light. In actual use, the width of the first protective layer 4 is consistent with the width of the second protective layer 5, and is greater than the width of the double-sided photovoltaic cell 1 or the width of a plurality of double-sided photovoltaic cells 1. After the solar rays of the battery 1 pass through the first protective layer 4, a part of the light reflected from the grating plate 2 to the second protective layer 5 is directly reflected by the coated reflective coating onto the lower surface of the double-sided photovoltaic cell 1 (i.e., the solar on the area that cannot be directly irradiated), and improve the light energy on the entire surface area of the double-sided photovoltaic cell 1 .

In the above-mentioned two embodiments, since sunlight evenly and directly hits the upper surface of the first protective layer 4, it is refracted to the upper surface of the double-sided photovoltaic cell 1 after passing through the transparent material, or directly hits the upper surface of the grating plate. 21 on. Therefore, both the first protective layer 4 and the second protective layer 5 are made of one of ultra-clear tempered glass or plastics, and at the same time, the incident light is evenly refracted to the upper surface of the double-sided photovoltaic cell or the reflective layer 3 Above, preferably the upper and lower surfaces of the first protective layer 4 are both flat to ensure that the incident light is uniform and evenly reflected on the lower surface of the double-sided photovoltaic cell 1 after passing through the reflective layer 3, thereby ensuring double-sided photovoltaic cell 1. Light energy is uniformly introduced into the lower surface of the photovoltaic cell 1 to improve the utilization rate of the lower surface. At the same time, the upper (inner) and lower surfaces of the second protective layer 5 are all arranged as planes, which is not only beautiful but also can achieve the desired best effect no matter it is directly used as the reflective layer 3 or connected with the reflective layer 3 plane.

In actual operation, the application device of the double-sided battery includes the first protective layer 4, the double-sided photovoltaic cell 1 arranged between the first protective layer 4 and the reflective layer 3, and the first double-sided photovoltaic cell 101 and the second photovoltaic cell 101 are exemplary provided. Two double-sided photovoltaic cells 102 (the number of double-sided photovoltaic cells can be adjusted according to actual application requirements). Among them, mainly through the grating plate 2 arranged between the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102, the solar rays incident from the first protective layer 4 can all be irradiated to the first double-sided photovoltaic cell 101. The battery 101 and the second double-sided photovoltaic battery 102 meet the requirements that both the upper and lower surfaces can receive sunlight. In this way, the double-sided photovoltaic cell 1 can not only capture photons on the upper surface and convert them into electrical energy, but also ensure that the lower surface of the double-sided photovoltaic cell 1 can also capture photons, effectively improving the light energy of the entire double-sided photovoltaic cell 1. .

Of course, in actual use, in addition to improving the utilization rate of the double-sided photovoltaic cell 1 , it is also necessary to increase applicable occasions or make reasonable adjustments to meet the needs of different site areas. Thereby it is possible that a plurality of double-sided photovoltaic cells 1 can be integrally arranged, and can also be formed by connecting a single double-sided photovoltaic cell (that is, the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102 in the second embodiment described above are repeated) splicing, the specific number of splicing is selected according to actual needs), and a grating plate 2 is provided between each connection of multiple double-sided photovoltaic cells 1 . The grating plate 2 can ensure that the upper and lower surfaces of multiple double-sided photovoltaic cells receive sufficient and uniform light energy, improve the photoelectric conversion efficiency and use efficiency of the entire cell, and have a wide range of applications.

Among them, it should be noted that there are many ways to fix the double-sided photovoltaic cell 1, and the fixed connection can be realized through an external frame, or through the rear connection of the grating plate 2, and a fixing bracket 6 is further provided, and the fixing bracket 6 After actual installation, it only needs to be located on both sides of multiple double-sided photovoltaic cells 1 . At the same time, the fixing bracket 6 has a certain height, so that a certain distance can be maintained between the double-sided photovoltaic module 1 and the reflective layer 3 . Of course, it is also possible to keep a certain distance between the double-sided photovoltaic module 1 and the first protective layer 4. enter. Of course, in other embodiments, the fixing bracket 6 may not be provided or the shape of the fixing bracket 6 may be implemented.

It is not difficult to understand in this application that the set grating plate 2 plays a crucial role, and there are many ways to connect the grating plate 2, which can be located between the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102 The top is connected to the first protective layer 4, or it can be located above the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102 and connected to the lower surface edge of the two double-sided photovoltaic cells, as long as the grating plate 2 is connected to the adjacent The two double-sided photovoltaic cells 1 are connected to make full use of the sunlight between them.

Secondly, the width of the grating plate 2 is particularly important. Accordingly, in this application, the widths of the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102 are both the first width d1, and the width of the grating plate 2 is set to the second width d2, and d2 is set at 0.5 Between d1 and 0.8d1. Effectively make full use of the sunlight incident on the grating plate 2 with a certain width, and exert the utilization rate of the double-sided photovoltaic cell 1 .

Referring to Fig. 3, in this application, the upper surface 21 of the grating plate is specifically defined as a plane, and the lower surface 22 of the grating plate is composed of a first slope 221 and a second slope 222, and the inclination direction of the first slope 221 and the second slope 222 is Quite the opposite. Setting the two inclination directions opposite is mainly to make the light incident on the two inclines 221 and 222 be reflected to the adjacent surfaces of the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102 through the opposite inclined surfaces. Of course, in other embodiments, it is not necessarily set as a slope, but also a curved surface, etc., just to improve the reflectivity and ensure that all the received light is used, so the slope is preferred in this application.

Referring to Figures 4 and 5, since the incident angles of sunlight are different, the light rays of different angles are evenly reflected to the upper or lower surface of the double-sided photovoltaic cell 1 through the grating plate 2 . Therefore, the inclination angle 223 of the inclined plane is further specifically defined. Specifically, the included angles between the first inclined plane 221 and the second inclined plane 222 and the upper surface 21 of the grating plate are all set to be less than 90 degrees. A plurality of surfaces with the same inclination angle 223 are arranged in parallel, and a plurality of surfaces with the same inclination angle 223 arranged in parallel are formed to ensure that the reflected light can evenly enter the first double-sided photovoltaic cell 101 and the second double-sided photovoltaic cell 102, to prevent the unevenness of the incident light from causing the unevenness of the power saturation converted by each double-sided photovoltaic cell 1 and affecting the service life.

Referring again to Figures 4 and 5, the widths of the first slope 221 and the second slope 222 are set to be equal at the same time (according to the center line of the cross section of the entire grating plate 2, the slopes on both sides of the center line are set to be opposite. Wherein, the central line is marked with a dotted line, which is also the distinguishing line between the first slope 221 and the second slope 222), so that through two slopes of equal width and opposite inclination directions, light rays incident at different angles can be evenly injected into adjacent slopes. on the upper or lower surface of the two double-sided photovoltaic cells, and through the two slopes 221 and 222 of equal width, the upper and lower surfaces of the double-sided photovoltaic cells arranged adjacently in turn receive sunlight evenly and convert it into electrical energy, and It is ensured that the surface of each double-sided photovoltaic cell 1 can be utilized evenly, and the utilization rate is improved. Of course, in other embodiments, reasonable adjustments may be made according to actual needs.

It should be explained in this application that the grating plate 2 can be directly preferably a thin film transmission grating, and a thin film transmission grating, and the reflective layer 3 is also preferably a thin film reflective layer. The reason why the film is not only good in light transmission, but also light in texture , to reduce the weight of the entire application device.

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 (10)

1. an application apparatus for double side photovoltaic battery, is characterized in that: comprise,

Sunray is injected direction and is provided with the first protective layer from top to bottom successively and for receiving sunray, and carries out the reflector reflected, and is arranged on the multiple double side photovoltaic batteries between described first protective layer and described reflector;

An original screen panel is provided with between adjacent described double side photovoltaic battery; described original screen panel receive described first protective layer transmitted through sunray; and inject on upper surface that angle difference reflexes to described double side photovoltaic battery respectively and on described reflector according to light, described reflector by the light reflection that receives on the lower surface of described double side photovoltaic battery.

2. the application apparatus of double side photovoltaic battery according to claim 1, is characterized in that:

Also comprise the second protective layer arranged dorsad with described reflector, formed between described second protective layer and described first protective layer and be used for accommodating described double side photovoltaic battery and described original screen panel, and the accommodation space in described reflector.

3. the application apparatus of double side photovoltaic battery according to claim 1, is characterized in that:

Described reflector is the second protective layer, and described second protective layer scribbles reflectance coating on the inner surface of described double side photovoltaic battery side.

4. the application apparatus of the double side photovoltaic battery according to Claims 2 or 3, is characterized in that:

The upper and lower surface of described first protective layer and described second protective layer is plane.

5. the application apparatus of the double side photovoltaic battery according to Claims 2 or 3, is characterized in that:

Described first protective layer and described second protective layer are ultrawhite toughened glass or plastics.

6. the application apparatus of double side photovoltaic battery according to claim 1, is characterized in that:

Also comprise one for the fixed support of fixing described dual light photovoltaic assembly, described fixed support is positioned at the relative both sides of described dual light photovoltaic assembly, and has certain altitude and make to keep certain distance between described dual light photovoltaic assembly and described reflector.

7. the application apparatus of double side photovoltaic battery according to claim 1, is characterized in that:

The width of described double side photovoltaic battery is the first width d1;

The width of described original screen panel is the second width d2;

Described second width d2 is between 0.5d1 ~ 0.8d1.

8. the application apparatus of double side photovoltaic battery according to claim 1, is characterized in that:

The upper surface of described original screen panel is plane, and lower surface is by for reflexing to the first inclined-plane on adjacent described double side photovoltaic battery respectively and the second inclined-plane is formed by sunray, the incline direction on described first inclined-plane and described second inclined-plane is contrary.

9. the application apparatus of double side photovoltaic battery according to claim 8, is characterized in that:

Described first inclined-plane and the angle between described second inclined-plane and the upper surface of described original screen panel are all less than 90 degree;

Described first inclined-plane and described second inclined-plane are by the face that multiple angle of inclination is identical formation arranged in parallel, and two surface widths are equal.

10. the application apparatus of double side photovoltaic battery according to claim 9, is characterized in that:

Described original screen panel is film transmission grating.