CN106784087A - A kind of composite solar battery backboard - Google Patents

Abstract

The invention discloses a composite solar cell backsheet, comprising a top layer 1, a base layer 2 and a bottom layer 3, the top layer 1 and the base layer 2, the base layer 2 and the bottom layer 3 are bonded by an adhesive layer 4, which It is characterized in that: the upper surfaces of the top layer 1 and the base layer 2 have a pyramid structure 5, and the cross section of the pyramid structure 5 is triangular. The photovoltaic backplane can reduce the degree to which incident light is reflected into the air, increase the light absorption rate of the photovoltaic module, and further increase the power of the photovoltaic module.

Description

A composite solar battery backplane

technical field

The invention relates to a photovoltaic component, in particular to a photovoltaic backplane of the photovoltaic component.

Background technique

Solar energy seems to be an inexhaustible source of energy, so research on solar energy has attracted a lot of attention. A solar cell is a device developed to convert solar energy directly into electrical energy.

Generally, the solar module mechanically supports the solar cells and protects the solar cells from environmental degradation. Solar modules typically include a rigid and transparent protective front sheet (eg glass) and a rear or backsheet. The front sheet and the back sheet encapsulate the solar cells and thus protect the solar cells from environmental degradation.

The photovoltaic backsheet is located on the back of the solar panel, which protects and supports the battery sheet, and has reliable insulation, water resistance and aging resistance. At present, a conventional photovoltaic backplane generally has a three-layer structure as shown in FIG. 1 . The top layer 1 is mostly made of fluorine-containing materials, such as PVF, PVDF, etc., or fluorine-free EVA materials; the base layer 2 is made of PET materials; the bottom layer 3 is mostly made of PVF, PVDF, PTFE and other fluorine-containing materials. There is a layer of bonding layer 4 between the top layer and the base layer, and between the base layer and the bottom layer to bond the layers together to form a flat overall structure.

Since the surface of the photovoltaic backplane is a planar structure, most of the vertical incident light or incident light at a small angle will be reflected into the air again by the backplane, which cannot be well absorbed and utilized by the cells, which is not conducive to the photovoltaic module's light response. absorb.

In view of this, there is an urgent need for an improved backplane that can improve the above-mentioned problems.

Contents of the invention

The purpose of the present invention is to provide a composite solar battery back sheet, which can reduce the degree of incident light being reflected into the air, increase the light absorption rate of the photovoltaic module, and further increase the power of the photovoltaic module.

A composite solar battery back sheet, comprising a top layer, a base layer and a bottom layer, the top layer and the base layer, and the base layer and the bottom layer are bonded by an adhesive layer, and it is characterized in that: the upper surfaces of the top layer and the base layer It has a pyramid structure, and the cross section of the pyramid structure is triangular.

The top layer is made of fluorine-containing material or fluorine-free material; the base layer is made of PET material; the bottom layer is made of fluorine-containing material, wherein the top layer is mixed with silica nanoparticles, and the base layer is mixed with silicon carbide Electret particles, the bottom layer is mixed with silver fluoride particles.

The "approximate isosceles triangle" mentioned herein refers to any structure having three vertices, and the straight-line distances from one of the vertices to the other two vertices are respectively equal. In the pyramid structure whose cross section is an approximate isosceles triangle in the present invention, the straight-line distance between the highest point of its protrusion and the other two vertices is equal, and the connecting line between it is two identical arcs, such as convex Arc or concave arc.

When the incident light hits the surface of the isosceles triangle structure or the approximate isosceles triangle structure, it will be reflected back to the inside of the module at a certain angle, and the light reflected back to the inside of the module will be reflected back to the inside of the module again at the glass/air interface, and has Part of it is incident again on one side of the battery and is absorbed and converted into electrical energy.

The apex angle of the triangle is greater than or equal to 90° and less than or equal to 138°.

In the present invention, the apex angle of a triangle means the included angle between the highest point of the pyramid structure and two straight connecting lines between the other two points of the triangle. According to calculation, when the apex angle is greater than or equal to 90° and less than or equal to 138°, the absorbing effect of the battery sheet on the reflected light of the back plate is the best.

The beneficial effect of the invention is: it can effectively reflect the incident light back to the inside of the photovoltaic module, reduce the degree of the incident light being reflected into the air, increase the light absorption rate of the photovoltaic module, and then increase the power of the photovoltaic module.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the accompanying drawings are provided, wherein:

Fig. 1 is the structural diagram of the photovoltaic backplane of embodiment 1 of the present invention;

2 is a schematic diagram of light reflection of a photovoltaic module using the photovoltaic backplane of Example 1;

Fig. 3 is a structural diagram of a photovoltaic backplane according to the second embodiment of the present invention.

Reference signs: 1-top layer; 2-base layer; 3-bottom layer; 4-bonding layer; 5-pyramid structure; 6-glass; 7-EVA1; 8-EVA2; 9-photovoltaic backplane; 10-battery.

detailed description

In order to make the description of the present disclosure more detailed and complete, the following provides illustrative descriptions of the implementation aspects and specific embodiments of the present invention; but this is not the only form of implementing or using the specific embodiments of the present invention. The embodiments disclosed below can be combined or substituted for each other when beneficial, and other embodiments can also be added to one embodiment without further description or illustration.

In the following description, numerous specific details will be set forth in order to enable readers to fully understand the following embodiments. However, embodiments of the invention may be practiced without such specific details. In other instances, well-known structures and devices are only schematically shown in order to simplify the drawings.

As shown in Figure 1, the photovoltaic backboard of this embodiment includes upper, middle and lower three-layer structures, the top layer 1 and the base layer 2, the base layer 2 and the bottom layer 3 are bonded by an adhesive layer 4, the top layer and the bottom layer of the backboard The upper surface of the base layer has a pyramid structure 5 whose cross-section is an isosceles triangle with an apex angle of 138°.

When making the photovoltaic backsheet, firstly, the upper surface of the base layer 2 is made into a protruding triangular structure, and then the top layer 1 is closely bonded to the surface of the base layer through the adhesive layer 2 .

The top layer 1 is made of fluorine-containing material or fluorine-free material; the base layer 2 is made of PET material; the bottom layer 3 is made of fluorine-containing material, wherein the top layer is mixed with silica nanoparticles, and the base layer is mixed with There are silicon carbide electret particles, and the bottom layer is mixed with silver fluoride particles.

Fig. 2 shows a schematic diagram of light reflection of a photovoltaic module to which the photovoltaic backsheet of this embodiment is applied. Among them, from top to bottom, it includes glass 6, EVA1 layer 7, battery 10, EVA2 layer 8, and photovoltaic backplane 9. Through theoretical simulation calculations, the absorption of light by the new backplane structure components is about 0.8% higher than that of conventional components. The power increase is about 0.8%.

As shown in Figure 3, the photovoltaic backsheet of this embodiment includes an upper, middle, and lower three-layer structure. The top layer 1 and the base layer 2, and the base layer 2 and the bottom layer 3 are bonded by an adhesive layer 4. The upper surface of the upper surface has a pyramid structure 5, and the cross section of the pyramid structure 5 is an approximate isosceles triangle, and there are two identical concave arcs between one vertex of the approximate isosceles triangle and the other two vertices; The top angle is 90°.

The top layer 1 is made of fluorine-containing material or fluorine-free material; the base layer 2 is made of PET material; the bottom layer 3 is made of fluorine-containing material, wherein the top layer is mixed with silica nanoparticles, and the base layer is mixed with There are silicon carbide electret particles, and the bottom layer is mixed with silver fluoride particles.

When making the photovoltaic backsheet, firstly, the upper surface of the base layer 2 is made into a protruding approximately triangular structure, and then the top layer 1 is closely bonded to the surface of the base layer through the adhesive layer 2 .

Claims (4)

1. a kind of composite solar battery backboard, including top layer（1）, basic unit（2）And bottom（3）, described top layer（1）And basic unit （2）, described basic unit（2）And bottom（3）Between pass through tack coat（4）Bond, it is characterised in that：Described top layer（1）And base Layer（2）Upper surface there is pyramid structure（5）, described pyramid structure（5）Cross section be triangle, described top layer （1）Using fluorine material or fluorine material is not made；Basic unit（2）It is made using PET material；Bottom（3）Using fluorine material system Into wherein being mixed with nano SiO 2 particle in described top layer, described basic unit is mixed with carborundum electret particle, institute The bottom stated is mixed with fluorination Argent grain.

2. composite solar battery backboard according to claim 1, it is characterised in that：Described cross section is isoceles triangle The pyramid structure of shape, refer to it is any there are three summits, and one of summit is to straight between two other summits Linear distance distinguishes equal structure.

3. composite solar battery backboard according to claim 1, it is characterised in that：Described cross section is approximate isosceles The pyramid structure of triangle, the peak of its projection is equal to the air line distance between two other summit, the company between it Line is two identical camber lines.

4. the composite solar battery backboard according to Claims 2 or 3, it is characterised in that：The drift angle of described triangle Angle is more than or equal to 90 °, and less than or equal to 138 °.