Modulation film and solar cell panel

Abstract

The utility model relates to the technical field of solar energy, and discloses a modulation film and a solar cell panel, the modulation film is provided with a first structure and a first coating, and the modulation film is placed on one side deviating from the incident light surface of a solar cell; therefore, the incident light leaked between the two solar cells can be reflected to the solar cells again by the modulation film, so that the number of the incident light of the solar cells is increased, and the utilization rate of sunlight by the photovoltaic module is improved.

Description

Technical Field

[0001] This utility model relates to the field of solar energy technology, specifically to a modulation film and a solar panel. Background Technology

[0002] Existing solar panels, due to assembly and disassembly requirements, employ a method of splicing multiple solar cells when laying large areas of solar panels. However, when splicing multiple solar cells, the stability of welding and connection needs to be considered. Therefore, a certain distance must be set between two solar cells to retain a certain space for deformation. The existence of the gap means that the incident light in this area cannot be converted. As the overall spliced ​​area of ​​the solar panel increases, the ratio of the occupied area to the converted electrical energy decreases. Utility Model Content

[0003] In view of the above problems, this utility model provides a modulation film to solve the technical problem that splicing solar cells affects the overall conversion rate of the solar panel in the prior art.

[0004] According to one aspect of the present invention, a modulation film is provided for use in a solar module. The modulation film includes an adhesive, a substrate, a first structure, and a first coating sequentially stacked; incident light passes through the first coating, the first structure, and the first coating sequentially before exiting.

[0005] The solar module includes at least two spaced solar cells; the modulation film is disposed on a side opposite to the incident light surface of the solar cells;

[0006] The first structure is used to reflect the incident light to the solar cell.

[0007] The first coating is used to adhere to the first structure with a uniform thickness, and the refractive index of the first coating is different from the refractive index of the first structure.

[0008] In one alternative embodiment, the modulation film further includes a second structure and a second coating sequentially disposed on the first coating;

[0009] The second structure is used to increase the angle of the reflected light from the first structure;

[0010] The second coating is used to adhere to the second structure with a uniform thickness, and the refractive index of the second coating is different from that of the second structure.

[0011] In one alternative embodiment, the modulation film further includes a second substrate disposed on the first structure;

[0012] The second substrate is bonded to the first structure through a first adhesive layer, and an air cavity is formed between the first adhesive layer and the first structure;

[0013] The air cavity is used to increase the angle of reflected light and the angle of transmitted light of the first structure, thereby increasing the travel length of incident light in the modulation film.

[0014] In one alternative embodiment, both the first structure and the second structure include multiple microstructures, which are composed of one or more structures selected from rectangles, triangles, semicircles, trapezoids, and semi-ellipses.

[0015] In one alternative approach, when the microstructure is rectangular, the structural period of the first or second structure is 5um-80um, the width d is 3um-40um, and the height h is 3um-20um.

[0016] When the microstructure is triangular, the structural period of the first structure or the second structure is 5um-100um, the structural width d1 is 5um-100um, and the height h1 is 5um-40um.

[0017] When the microstructure is semi-circular, the structural period of the first structure or the second structure is 3um-80um and the radius is 3um-40um.

[0018] When the microstructure is trapezoidal, the structural period of the first or second structure is 5um-100um, the top width a is 1um-20um, the bottom width b is 5um-50um, and the height h2 is 3um-30um.

[0019] When the microstructure is semi-elliptical, the structural period of the first or second structure is 5um-80um, the structural width d2 is 5um-40um, and the height h3 is 5um-30um.

[0020] In one alternative approach, the thickness range of both the first coating and the second coating is 50 nm to 200 nm.

[0021] In one alternative embodiment, the materials of the first coating and the second coating are both any one of Al, Ag, Ni, Cu, stainless steel, ZnS, ZnO, CaF2, and TiO2.

[0022] In one alternative, the materials of the first structure and the second structure are all of the following: hot-pressed, UV-cured, and dual-cured.

[0023] According to a second aspect of the present invention, a solar panel is provided, the solar panel including a solar module and a modulation film as described above, the solar module including at least two solar cells spaced apart; the modulation film is disposed on a side opposite to the incident light surface of the solar cells.

[0024] In one alternative embodiment, the solar panel further includes a backsheet, EVA, and transparent glass, wherein the transparent glass, the EVA, and the solar cells are stacked sequentially, and the modulation film is disposed between the backsheet and the solar cells.

[0025] In one alternative, the modulation film is positioned directly opposite the gap between the two solar cells.

[0026] This invention solves the technical problem of the impact of spliced ​​solar cells on the overall conversion efficiency of solar panels by setting a first structure and a first coating, and placing the modulation film on the side opposite to the incident light surface of the solar cell. This allows the incident light that is missed between two solar cells to be reflected back to the solar cell by the modulation film, thereby increasing the amount of incident light on the solar cell and improving the utilization rate of sunlight by the photovoltaic module.

[0027] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0028] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 A schematic diagram of the structure of an embodiment of the modulation film provided by this utility model is shown;

[0030] Figure 2 A schematic diagram of another embodiment of the modulation film provided by this utility model is shown;

[0031] Figure 3 A schematic diagram of the microstructure of the modulation film provided by this utility model is shown.

[0032] Figure 3-1 A schematic diagram showing the rectangular microstructure of the modulation film provided by this utility model is shown.

[0033] Figure 3-2A schematic diagram showing the triangular microstructure of the modulation film provided by this utility model is shown.

[0034] Figure 3-3 A schematic diagram showing the semi-circular microstructure of the modulation film provided by this utility model is shown.

[0035] Figure 3-4 A schematic diagram showing the trapezoidal microstructure of the modulation film provided by this utility model is shown.

[0036] Figure 3-5 A schematic diagram showing the semi-elliptical microstructure of the modulation film provided by this utility model is shown.

[0037] Figure 4 A schematic diagram of the structure of the solar panel provided by this utility model is shown;

[0038] Figure 5 A schematic diagram of the structure of the solar panel provided by this utility model is shown;

[0039] Figure 6 A schematic diagram of another embodiment of the modulation film provided by this utility model is shown. Detailed Implementation

[0040] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0041] This application proposes a modulation film to solve the technical problem of unstable performance of internally matched power amplifiers at low frequencies in the prior art.

[0042] In an alternative embodiment, refer to Figure 1 As shown, the modulation film applied to a solar module includes an adhesive 10, a substrate 20, a first structure 30, and a first coating 40 stacked sequentially; incident light passes through the first coating 40, the first structure 30, and the first coating 40 sequentially before exiting. The solar module includes at least two spaced-apart solar cells; the modulation film is disposed on the side opposite to the incident light surface of the solar cells.

[0043] In this structure, the first structure 30 reflects incident light to the solar cell, and the first coating 40 is attached to the first structure 30 with a uniform thickness. The refractive index of the first coating 40 is different from that of the first structure 30.

[0044] The above solution sets up a first structure 30 and a first coating 40, and places the modulation film on the side opposite to the incident light surface of the solar cell, so that the incident light that is missed between the two solar cells can be reflected back to the solar cell by the modulation film, thereby increasing the amount of incident light on the solar cell and improving the utilization rate of sunlight by the photovoltaic module.

[0045] It should be noted that the function of the first coating 40 is to create a difference in refractive index between different materials, preventing the structure from becoming filled and losing its effectiveness. This coating can be processed through vacuum deposition, spraying, or coating methods. In particular, the first coating 40 can also increase the adhesion strength between the first structure 30 and the subsequent second structure. Furthermore, the adhesive 10 is provided to facilitate the bonding of the film to other materials. In practice, films without adhesive 10 can also be produced separately, and the adhesive 10 can be applied during use.

[0046] During the processing of the first structure 30, the first structure 30 can be formed on the substrate 20 through three methods: hot pressing, UV pressing, and double curing pressing, by the mutual matching of materials. Among them, the hot pressing method requires the materials to have a relatively low processing temperature, such as 60-200℃. If the processing temperature is too high, the requirements for the heat resistance of other materials and the processing equipment will be higher.

[0047] In an alternative embodiment, refer to Figure 6 As shown, the modulation film also includes a second substrate 70 disposed on the first structure 30; the second substrate 70 is bonded to the first structure 30 through a first adhesive layer 80, and an air cavity 90 is formed between the first adhesive layer 80 and the first structure 30.

[0048] The air cavity 90 is formed because the fine structure of the first structure 30, such as rectangular, triangular, semi-circular, trapezoidal, or semi-elliptical, allows the smoothly extended first adhesive layer 80 to adhere to the first structure 30, creating an air cavity between the first adhesive layer 80 and the first structure 30. This air cavity increases the angle of reflected light and the angle of transmitted light from the first structure, thereby increasing the travel length of the incident light in the modulation film.

[0049] In an alternative embodiment, refer to Figure 2 As shown, the modulation film also includes a second structure 50 and a second coating 60 sequentially disposed on the first coating 40;

[0050] The second structure 50 is used to increase the angle of the reflected light reflected by the first structure 30;

[0051] A second coating 60 is used to adhere to the second structure 50 with a uniform thickness, and the refractive index of the second coating 60 is different from that of the second structure 50.

[0052] Among them, the second structure 50 is the main optical modulation structure of the optical modulation film. Its function is to reflect as much light as possible through the battery gap back to the battery. It not only needs to form a good reflection effect, but also needs to open the light at a sufficiently large angle so that it will not leak out from the gap again.

[0053] Furthermore, the second structure 50 can be processed in the following ways: through the mutual matching of materials, it can be formed on the substrate 20 by three methods: hot pressing, UV pressing, and double curing pressing. Among them, hot pressing requires the material to have a relatively low processing temperature, such as 60-200℃. If the processing temperature is too high, the requirements for the heat resistance of other materials and the processing equipment will be higher.

[0054] Optionally, both the first structure 30 and the second structure 50 include multiple microstructures, which are composed of one or more structures selected from rectangles, triangles, semicircles, trapezoids, and semi-ellipses. They can also be implemented through random graphic combinations.

[0055] Optionally, refer to Figure 3-1 As shown, when the microstructure is rectangular, the structural period of the first structure 30 or the second structure 50 is 5um-80um, the width d is 3um-40um, and the height h is 3um-20um.

[0056] Optionally, refer to Figure 3-2 As shown, when the microstructure is triangular, the structural period of the first structure 30 or the second structure 50 is 5um-100um, the structural width d1 is 5um-100um, and the height h1 is 5um-40um.

[0057] Optionally, refer to Figure 3-3 As shown, when the microstructure is semi-circular, the structural period of the first structure 30 or the second structure 50 is 3um-80um, and the radius is 3um-40um.

[0058] Optionally, refer to Figure 3-4 As shown, when the microstructure is trapezoidal, the structural period of the first structure 30 or the second structure 50 is 5um-100um, the top width a is 1um-20um, the bottom width b is 5um-50um, and the height h2 is 3um-30um.

[0059] Optionally, refer to Figure 3-5 As shown, when the microstructure is semi-elliptical, the structural period of the first structure 30 or the second structure 50 is 5um-80um, the structural width d2 is 5um-40um, and the height h3 is 5um-30um.

[0060] Optionally, the thickness range of the first coating 40 and the thickness range of the second coating 60 are both 50 to 200 nm.

[0061] Optionally, the materials of the first coating 40 and the second coating 60 are any one of Al, Ag, Ni, Cu, stainless steel, ZnS, ZnO, CaF2, and TiO2.

[0062] Optionally, the materials of the first structure 30 and the second structure 50 are either hot-pressed, UV-cured, or dual-curing.

[0063] Among them, hot-pressed materials include polypropylene (PP), polyethylene terephthalate (PET), high-density polyethylene (HDPE), polycarbonate (PC), polymethyl methacrylate (PMMA), etc.

[0064] UV-sensitive materials include prepolymers with acrylate and methacrylate groups, epoxy and allyl groups, etc.

[0065] Dual-curing materials include polyurethane acrylates, epoxy resins, bisphenol A epoxy resins, bisphenol F epoxy resins, glycidyl amine special epoxy resins, etc.

[0066] This application also proposes a solar panel, with reference to... Figure 4 As shown, the solar panel includes a solar module and a modulation film as described above. The solar module includes at least two solar cells spaced apart. The modulation film is located on a side opposite to the incident light surface of the solar cells.

[0067] Since the solar panel of this application includes all the schemes of modulation film, the solar panel of this application also has all the beneficial effects of modulation film, which will not be repeated here.

[0068] Optionally, the solar panel also includes a backsheet EVA and transparent glass, with the transparent glass, EVA and solar cells stacked in sequence, and a modulation film disposed between the backsheet and the solar cells.

[0069] EVA is also used to fill the gap between the two solar cells and is bonded to the modulation film to ensure that the light path does not deviate.

[0070] Optionally, refer to Figure 5 As shown, the modulation film is positioned directly opposite the gap between the two solar cells.

[0071] At this point, the actual area of ​​the modulation film can be reduced according to the needs of use. The modulation film can be set only to cover the area covered by the light transmission gap, thereby saving on usage costs.

[0072] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself constitutes a separate embodiment of the invention.

[0073] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0074] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A modulation film, characterized in that, Applied to solar modules, the modulation film includes an adhesive, a substrate, a first structure, and a first coating layered sequentially; wherein incident light passes through the first coating, the first structure, and the first coating layer sequentially before exiting. The solar module includes at least two spaced solar cells; the modulation film is disposed on a side opposite to the incident light surface of the solar cells; The first structure is used to reflect the incident light to the solar cell. The first coating is used to adhere to the first structure with a uniform thickness, and the refractive index of the first coating is different from the refractive index of the first structure.

2. The modulation film as described in claim 1, characterized in that, The modulation film further includes a second substrate disposed on the first structure; The second substrate is bonded to the first structure through a first adhesive layer, and an air cavity is formed between the first adhesive layer and the first structure; The air cavity is used to increase the angle of reflected light and the angle of transmitted light of the first structure, thereby increasing the travel length of incident light in the modulation film.

3. The modulation film as described in claim 1, characterized in that, The modulation film further includes a second structure and a second coating sequentially disposed on the first coating; The second structure is used to increase the angle of the reflected light from the first structure; The second coating is used to adhere to the second structure with a uniform thickness, and the refractive index of the second coating is different from that of the second structure.

4. The modulation film as described in claim 3, characterized in that, Both the first structure and the second structure include multiple microstructures, which are composed of one or more of the following structures: rectangle, triangle, semicircle, trapezoid, and semi-ellipse.

5. The modulation film as described in claim 4, characterized in that, When the microstructure is rectangular, the structural period of the first structure or the second structure is 5um-80um, the width d is 3um-40um, and the height h is 3um-20um; When the microstructure is triangular, the structural period of the first structure or the second structure is 5um-100um, the structural width d1 is 5um-100um, and the height h1 is 5um-40um. When the microstructure is semi-circular, the structural period of the first structure or the second structure is 3um-80um, and the radius R is 3um-40um. When the microstructure is trapezoidal, the structural period of the first structure or the second structure is 5um-100um, the top width a is 1um-20um, the bottom width b is 5um-50um, and the height h2 is 3um-30um. When the microstructure is semi-elliptical, the structural period of the first or second structure is 5um-80um, the structural width d2 is 5um-40um, and the height h3 is 5um-30um.

6. The modulation film as described in claim 3, characterized in that, The thickness range of both the first coating and the second coating is 50nm to 200nm.

7. The modulation film as described in claim 3, characterized in that, The material of the first coating is any one of Al, Ag, Ni, Cu, stainless steel, ZnS, ZnO, CaF2, and TiO2, and the material of the second coating is any one of ZnS, ZnO, CaF2, and TiO2.

8. The modulation film as described in claim 3, characterized in that, The materials of the first structure and the second structure are all of the following: hot-pressed, UV-cured, and dual-cured.

9. A solar panel, characterized in that, The solar panel includes a solar module and a modulation film as described in any one of claims 1-8, wherein the solar module includes at least two solar cells spaced apart; and the modulation film is disposed on a side opposite to the incident light surface of the solar cells.

10. The solar panel as claimed in claim 9, characterized in that, The solar panel also includes a back sheet, EVA and transparent glass, the transparent glass, the EVA and the solar cells are stacked in sequence, and the modulation film is disposed between the back sheet and the solar cells; the modulation film is disposed opposite the gap between two solar cells.

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