Heterojunction cell photovoltaic module

Abstract

The utility model relates to a heterojunction cell photovoltaic assembly. The heterojunction cell photovoltaic module comprises a front photovoltaic glass plate and a back photovoltaic glass plate which are oppositely arranged; the heterojunction cell array is positioned between the front photovoltaic glass plate and the back photovoltaic glass plate; the liquid silica gel light conversion adhesive film is located between the front photovoltaic glass plate and the heterojunction cell array, and the liquid silica gel light conversion adhesive film is suitable for converting light below 400 nm into visible light above 400 nm; and the packaging adhesive film is positioned between the back photovoltaic glass plate and the heterojunction cell array. According to the heterojunction cell photovoltaic module provided by the utility model, the light transmittance of the front surface of the heterojunction cell photovoltaic module and the utilization rate of ultraviolet light can be improved, so that the utilization rate of solar rays and the efficiency of the heterojunction cell photovoltaic module are improved, meanwhile, the aging of the module can be reduced, and the service life of the module is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic modules, and particularly relates to a heterojunction battery photovoltaic module. Background Art

[0002] The existing heterojunction battery photovoltaic module is laminated and encapsulated by "photovoltaic front glass, encapsulation adhesive film, heterojunction battery array, encapsulation adhesive film, photovoltaic back glass". Among them, the encapsulation adhesive film is generally EPE, EVA, POE and other adhesive films, with low visible light transmittance and no ultraviolet light conversion function, which will affect the sunlight absorbed by the front of the heterojunction battery array, resulting in low utilization rate of sunlight and ultraviolet light in the heterojunction battery photovoltaic module, thus reducing the efficiency of the heterojunction battery photovoltaic module.

[0003] Therefore, a solution is needed to improve the light transmittance of the front of the heterojunction battery photovoltaic module and the utilization rate of ultraviolet light, so as to increase the utilization rate of sunlight and the efficiency of the heterojunction battery photovoltaic module. Summary of the Utility Model

[0004] Therefore, the utility model provides a heterojunction battery photovoltaic module to solve the problem that the encapsulation adhesive film used in the existing heterojunction battery photovoltaic module has low visible light transmittance and no ultraviolet light conversion function, resulting in low utilization rate of sunlight and ultraviolet light in the heterojunction battery photovoltaic module, thus reducing the efficiency of the heterojunction battery photovoltaic module.

[0005] The utility model provides a heterojunction battery photovoltaic module, including:

[0006] Relatively arranged front photovoltaic glass plate and back photovoltaic glass plate;

[0007] A heterojunction battery array located between the front photovoltaic glass plate and the back photovoltaic glass plate;

[0008] A liquid silicone light conversion adhesive film located between the front photovoltaic glass plate and the heterojunction battery array, and the liquid silicone light conversion adhesive film is adapted to convert light below 400nm into visible light above 400nm;

[0009] An encapsulation adhesive film located between the back photovoltaic glass plate and the heterojunction battery array.

[0010] Optionally, the thickness of the liquid silicone light conversion adhesive film is 0.5mm - 1.5mm;

[0011] The viscosity of the liquid silicone light conversion adhesive film is 10Pa·s - 50Pa·s;

[0012] The visible light transmittance of the liquid silicone light conversion adhesive film is greater than that of the encapsulation adhesive film.

[0013] Optionally, the visible light transmittance of the liquid silicone light conversion film is greater than 80%.

[0014] Optionally, the ultraviolet light conversion efficiency of the liquid silicone light conversion film is greater than 80%.

[0015] Optionally, the heterojunction battery photovoltaic module further includes:

[0016] A butyl rubber layer, located at the edge around the front photovoltaic glass plate and between the front photovoltaic glass plate and the back photovoltaic glass plate;

[0017] The first surface of the butyl rubber layer is connected to the front photovoltaic glass plate, and the first surface of the butyl rubber layer is connected to the back photovoltaic glass plate.

[0018] Optionally, the width of the butyl rubber layer is 10 mm - 15 mm.

[0019] Optionally, the butyl rubber layer is formed by a butyl tape.

[0020] Optionally, the side surface of the butyl rubber layer is connected to the side surface of the liquid silicone light conversion film.

[0021] Optionally, a cavity is formed between the side surface of the butyl rubber layer and the side surface of the liquid silicone light conversion film, and the cavity is adapted to accommodate the excess liquid silicone light conversion glue during the lamination process.

[0022] Optionally, the distance between the butyl rubber layer and the liquid silicone light conversion film is 2 mm - 5 mm.

[0023] The technical solution of the present utility model has the following advantages:

[0024] (1) The present utility model uses a liquid silicone light conversion film to replace the front encapsulation film in the existing solution for connecting the front photovoltaic glass plate and the front of the heterojunction battery array. First, due to the high visible light transmittance of the liquid silicone light conversion film, the light transmittance of the front of the heterojunction battery photovoltaic module can be increased, the utilization of sunlight by the front of the heterojunction battery array can be increased, and thus the power of the module can be improved; at the same time, the liquid silicone film can cover the front of the heterojunction battery array, and can protect the battery array while transmitting light, achieving the same effect as the front encapsulation film. Second, due to the ultraviolet light conversion effect of the liquid silicone light conversion film, part of the ultraviolet light can be converted into visible light, improving the utilization rate of ultraviolet light by the heterojunction battery photovoltaic module, and thus improving the power of the module; finally, the liquid silicone has excellent weather resistance and ultraviolet resistance, can reduce the aging of the module, and improve the service life of the module.

[0025] (2) The present utility model provides a butyl rubber layer between the front photovoltaic glass plate and the back photovoltaic glass plate, and the butyl rubber layer is located at the edges around the front photovoltaic glass plate and the back photovoltaic glass plate. On the one hand, by utilizing the water-blocking and sealing effect of the butyl rubber layer, water vapor can be effectively prevented from entering the interior of the component, thereby improving the sealing performance of the component. On the other hand, during the lamination process of manufacturing the component, the butyl rubber layer can effectively prevent the liquid silicone from overflowing from the side of the component, thus improving the yield rate of the component. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of a heterojunction battery photovoltaic module according to an embodiment of the present utility model;

[0028] Figure 2 Light transmittance of the liquid silicone light conversion film to different wavelength bands according to an embodiment of the present utility model;

[0029] Figure 3 Conversion of ultraviolet light by the liquid silicone light conversion film according to an embodiment of the present utility model;

[0030] Figure 4 Top view schematic diagram of the butyl rubber layer of a heterojunction battery photovoltaic module according to an embodiment of the present utility model;

[0031] Figure 5 Structural schematic diagram of another heterojunction battery photovoltaic module according to an embodiment of the present utility model;

[0032] Figure 6 Structural schematic diagram of yet another heterojunction battery photovoltaic module according to an embodiment of the present utility model.

[0033] Explanation of the reference numerals:

[0034] 1 - Front photovoltaic glass plate; 2 - Back photovoltaic glass plate; 3 - Heterojunction battery array; 4 - Liquid silicone light conversion film; 5 - Encapsulation film; 6 - Butyl rubber layer. Detailed Embodiments

[0035] To solve the problem that the visible light transmittance of the encapsulation adhesive film used in the existing heterojunction battery photovoltaic module is relatively low and there is no ultraviolet light conversion function, resulting in a relatively low utilization rate of sunlight and ultraviolet light in the heterojunction battery photovoltaic module, thereby reducing the efficiency of the heterojunction battery photovoltaic module, the present utility model provides a heterojunction battery photovoltaic module, including: a front photovoltaic glass plate and a back photovoltaic glass plate arranged opposite to each other; a heterojunction battery array located between the front photovoltaic glass plate and the back photovoltaic glass plate; a liquid silicone light conversion adhesive film located between the front photovoltaic glass plate and the heterojunction battery array, and the liquid silicone light conversion adhesive film is adapted to convert light below 400 nm into visible light above 400 nm; an encapsulation adhesive film located between the back photovoltaic glass plate and the heterojunction battery array.

[0036] Next, the technical solutions of the present utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] Reference Figure 1 , this embodiment provides a heterojunction battery photovoltaic module, including:

[0038] A front photovoltaic glass plate 1 and a back photovoltaic glass plate 2 arranged opposite to each other;

[0039] A heterojunction battery array 3 located between the front photovoltaic glass plate and the back photovoltaic glass plate;

[0040] A liquid silicone light conversion adhesive film 4 located between the front photovoltaic glass plate 1 and the heterojunction battery array 2, and the liquid silicone light conversion adhesive film 4 is adapted to convert light below 400 nm into visible light above 400 nm;

[0041] An encapsulation adhesive film 5 located between the back photovoltaic glass plate 2 and the heterojunction battery array 3.

[0042] Specifically, when implemented, the liquid silicone light conversion adhesive film 4 is used to bond and fix the front photovoltaic glass plate 1 and the heterojunction battery array 2, and convert part of the ultraviolet light into visible light, and then enter the front of the heterojunction battery array 3. The encapsulation adhesive film 5 is used to bond the back photovoltaic glass plate 2 and the heterojunction battery array 3.

[0043] In this embodiment, the liquid silicone light-converting film 4 is used to replace the front encapsulation film in the existing solution, and is used to connect the front surface of the front photovoltaic glass plate and the heterojunction battery array. First, since the visible light transmittance of the liquid silicone light-converting film is relatively high, the light transmittance of the front surface of the heterojunction battery photovoltaic module can be increased, the utilization of sunlight by the front surface of the heterojunction battery array can be increased, and thus the power of the module can be improved; at the same time, the liquid silicone film can cover the front surface of the heterojunction battery array, and can protect the battery array while transmitting light, achieving the same effect as the front encapsulation film. Secondly, since the liquid silicone light-converting film has an ultraviolet light-converting effect, part of the ultraviolet light can be converted into visible light, improving the utilization rate of ultraviolet light by the heterojunction battery photovoltaic module, and thus improving the power of the module; finally, the liquid silicone has excellent weather resistance and ultraviolet resistance, which can reduce the aging of the module and improve the service life of the module.

[0044] Further, in this embodiment, the thickness of the liquid silicone light-converting film is 0.5 mm - 1.5 mm, such as 0.5 mm, 0.9 mm, 1.2 mm, 1.5 mm, etc.;

[0045] The viscosity of the liquid silicone light-converting film is 10 Pa·s - 50 Pa·s, such as 10 Pa·s, 30 Pa·s, 40 Pa·s, 50 Pa·s, etc.;

[0046] The visible light transmittance of the liquid silicone light-converting film 4 is greater than that of the encapsulation film 5.

[0047] The encapsulation film 5 is a conventional encapsulation film, generally EVA, POE, EPE and other films. Since the visible light transmittance of the liquid silicone light-converting film 4 is greater than that of the encapsulation film 5, compared with the solution of using a conventional encapsulation film (EVA, POE, EPE, etc.) as the front film of the heterojunction battery array, the solution of this embodiment can improve the utilization rate of sunlight by the front surface of the heterojunction battery array, and thus improve the power of the module.

[0048] Further, in this embodiment, the visible light transmittance of the liquid silicone light-converting film 4 is greater than 80%, such as 80%, 88%, 90%, 95%, etc.

[0049] Figure 2 For the light transmittance of the liquid silicone light-converting film 4 for different wavelength bands, it can be seen that the visible light transmittance of the liquid silicone light-converting film 4 is greater than 80%.

[0050] Further, in this embodiment, the ultraviolet light conversion efficiency of the liquid silicone light-converting film 4 is greater than 80%, such as 85%, 90%, 95%, 100%, etc.

[0051] According to Figure 3It can be seen that the light in the range of 280nm - 400nm is basically converted into visible light, and among ultraviolet light, the light in this wavelength range has the greatest impact, accounting for more than 80%. Therefore, the ultraviolet light conversion efficiency of the liquid silicone light conversion film 4 is greater than 80%.

[0052] In specific implementation, the liquid silicone light conversion film is formed by adding a light conversion agent material to liquid silicone. The light conversion agent material can be a benzotriazole derivative, which does not affect the light transmittance of the liquid silicone light conversion film. The liquid silicone light conversion film can convert part of the ultraviolet light in the sunlight passing through the front photovoltaic glass plate into visible light, so as to enter the surface of the heterojunction cell array for photoelectric conversion, improving the utilization rate of ultraviolet light by the heterojunction cell photovoltaic module, and further improving the power of the module. At the same time, liquid silicone has good weather resistance and ultraviolet resistance, which can reduce the aging of the module and improve the service life of the module.

[0053] Furthermore, in this embodiment, the heterojunction cell photovoltaic module further includes:

[0054] A butyl rubber layer 6, located at the edges around the front photovoltaic glass plate and between the front photovoltaic glass plate and the back photovoltaic glass plate;

[0055] The first surface of the butyl rubber layer 6 is connected to the front photovoltaic glass plate 1, and the first surface of the butyl rubber layer 6 is connected to the back photovoltaic glass plate 2.

[0056] In specific implementation, the butyl rubber layer 6 is used to fixedly connect the front photovoltaic glass plate and the back photovoltaic glass plate. The butyl rubber layer 6 is also located at the edges around the front photovoltaic glass plate 1 and the back photovoltaic glass plate 2, so as to form a sealed space inside the module. On the one hand, by using the water-blocking and sealing function of the butyl rubber layer, water vapor can be effectively prevented from entering the inside of the module, improving the sealing performance of the module. On the other hand, in the lamination process of module manufacturing, the butyl rubber layer can effectively prevent liquid silicone from overflowing from the side of the module, improving the yield of the module.

[0057] Furthermore, in this embodiment, the width of the butyl rubber layer 6 is 10mm - 15mm, such as 10mm, 11mm, 12mm, 14mm.

[0058] Furthermore, in this embodiment, as Figure 4 shown, the butyl rubber layer 6 is formed by a butyl tape.

[0059] In specific implementation, first stick the butyl tape on the edges around the back photovoltaic glass plate, then cover the front photovoltaic glass plate, and finally cure it through a lamination process to form a butyl sealant layer.

[0060] Furthermore, in some embodiments, as Figure 5As shown, the side of the butyl rubber layer 6 is connected to the side of the liquid silicone light conversion film 4. The liquid silicone light conversion liquid is just connected to the side of the butyl rubber layer 6 during the lamination process. Therefore, the side of the formed liquid silicone light conversion film 4 is connected to the side of the butyl rubber layer 6, which can ensure the sealing inside the device.

[0061] Further, in some embodiments, as Figure 6 shown, a cavity is formed between the side of the butyl rubber layer 6 and the side of the liquid silicone light conversion film 4. The cavity is adapted to accommodate the excess liquid silicone light conversion liquid during the lamination process, which can effectively prevent the excess liquid silicone light conversion liquid from overflowing from the side of the component during the lamination process, ensuring the sealing of the component and improving the yield of the component.

[0062] Further, in some embodiments, the distance between the butyl rubber layer 6 and the liquid silicone light conversion film 4 is 2 mm - 5 mm, such as 2 mm, 3 mm, 4 mm, 5 mm.

[0063] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A heterojunction cell photovoltaic module, characterized in that: include: A front photovoltaic glass panel and a back photovoltaic glass panel are arranged opposite to each other; A heterojunction cell array is located between the front photovoltaic glass panel and the back photovoltaic glass panel; The liquid silicone light-conversion adhesive film is located between the front photovoltaic glass panel and the heterojunction battery array, and the liquid silicone light-conversion adhesive film is suitable for converting light below 400nm into visible light above 400nm; the encapsulation adhesive film is located between the back photovoltaic glass panel and the heterojunction battery array.

2. The heterojunction cell photovoltaic module according to claim 1, characterized in that: The thickness of the liquid silicone light-converting film is 0.5 mm to 1.5 mm; The viscosity of the liquid silicone light-converting film is 10Pa·s-50Pa·s; The visible light transmittance of the liquid silicone light-converting adhesive film is greater than the visible light transmittance of the packaging adhesive film.

3. The heterojunction cell photovoltaic module according to claim 2, characterized in that: The visible light transmittance of the liquid silicone light-converting adhesive film is greater than 80%.

4. The heterojunction cell photovoltaic module according to claim 3, characterized in that: The ultraviolet light conversion efficiency of the liquid silicone light-converting adhesive film is greater than 80%.

5. The heterojunction cell photovoltaic module according to claim 1, characterized in that: The heterojunction cell photovoltaic module also includes: A butyl rubber layer is located at the edges around the front photovoltaic glass panel and between the front photovoltaic glass panel and the back photovoltaic glass panel; The first surface of the butyl rubber layer is connected to the front photovoltaic glass plate, and the second surface of the butyl rubber layer is connected to the back photovoltaic glass plate.

6. The heterojunction cell photovoltaic module according to claim 5, characterized in that: The width of the butyl rubber layer is 10mm-15mm.

7. The heterojunction cell photovoltaic module according to claim 6, characterized in that: The butyl rubber layer is formed by a butyl rubber tape.

8. The heterojunction cell photovoltaic module according to claim 7, characterized in that: The side surface of the butyl rubber layer is connected to the side surface of the liquid silicone light-converting adhesive film.

9. The heterojunction cell photovoltaic module according to claim 7, characterized in that: The side surface of the butyl adhesive layer and the side surface of the liquid silicone light-converting adhesive film form a cavity, and the cavity is suitable for accommodating excess liquid silicone light-converting adhesive during the lamination process.

10. The heterojunction cell photovoltaic module according to claim 9, characterized in that: The distance between the butyl rubber layer and the liquid silicone light-converting film is 2 mm-5 mm.

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