Solar cell module

Abstract

The utility model relates to a solar cell module. The solar cell module comprises a front photovoltaic glass plate and a back photovoltaic glass plate which are oppositely arranged; the solar cell string is positioned between the front photovoltaic glass plate and the back photovoltaic glass plate; the packaging adhesive film is positioned between the solar cell string and the back photovoltaic glass plate; the water-blocking hot-melt elastic colloid is positioned at the edge of the periphery of the back photovoltaic glass plate; a vacuum chamber is formed among the front photovoltaic glass plate, the solar cell string and the side surface of the water-blocking hot-melt elastic colloid; and a first distance is formed between the solar cell string and the front photovoltaic glass plate. The solar cell module provided by the utility model can improve the light utilization rate of the solar cell string, thereby improving the power, efficiency and CTM value of the module, improving the water resistance, sealing performance, reliability and weather resistance of the solar cell module, and prolonging the service life of the solar cell module.

Description

Technical Field

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

[0002] At present, the main encapsulation structures of mainstream solar cell modules are single-glass encapsulation and double-glass encapsulation. Among them, the single-glass encapsulation structure includes a front photovoltaic glass plate, an encapsulation adhesive film, a solar cell string, an encapsulation adhesive film, and a photovoltaic backplane; the double-glass encapsulation structure includes a front photovoltaic glass plate, an encapsulation adhesive film, a solar cell string, an encapsulation adhesive film, and a back photovoltaic glass plate. Whether it is single-glass encapsulation or double-glass encapsulation, the front photovoltaic glass plate and the solar cell string of the solar cell module are encapsulated with an encapsulation adhesive film, and the light transmittance of the encapsulation adhesive film can only reach 90% - 92%. Therefore, it seriously affects the utilization efficiency of the solar cell string for sunlight, resulting in a large power loss of the solar cell module, a low efficiency of the solar cell module, and a low ratio (CTM value) of the output power of the module to the power of the battery cell.

[0003] In addition, with the iteration of battery technologies, technologies such as TOPCon, HJT, and perovskite have greatly improved the battery efficiency. At the same time, they have also forced the battery to be more sensitive to water vapor. Therefore, the existing encapsulation adhesive film has poor water resistance and cannot meet the sealing encapsulation of new technology batteries, resulting in a reduction in the outdoor weather resistance of solar cell modules.

[0004] Therefore, a solution is needed to improve the light transmittance of the front photovoltaic glass plate to the battery and the utilization efficiency of sunlight in the solar cell module, thereby improving the efficiency and CMT value of the solar cell module. Summary of the Utility Model

[0005] Therefore, the utility model provides a solar cell module to solve the problems that the encapsulation adhesive film between the front photovoltaic glass plate and the solar cell string in the existing solar cell module has low light transmittance and poor water resistance, resulting in low utilization efficiency of the solar cell string for sunlight, thereby causing large power loss of the solar cell module, low outdoor weather resistance, and low efficiency and CTM value of the solar cell module.

[0006] The utility model provides a solar cell module, including:

[0007] A front photovoltaic glass plate and a back photovoltaic glass plate arranged oppositely;

[0008] A solar cell string located between the front photovoltaic glass plate and the back photovoltaic glass plate;

[0009] An encapsulation adhesive film located between the solar cell string and the back photovoltaic glass plate;

[0010] The water-blocking hot-melt elastic colloid is located at the edge around the back photovoltaic glass plate. The first surface of the water-blocking hot-melt elastic colloid is connected to the front photovoltaic glass plate, and the second surface of the water-blocking hot-melt elastic colloid is connected to the back photovoltaic glass plate;

[0011] A vacuum chamber is formed between the front photovoltaic glass plate, the solar cell string and the side surface of the water-blocking hot-melt elastic colloid; there is a first distance between the solar cell string and the front photovoltaic glass plate.

[0012] Optionally, the distance between the water-blocking hot-melt elastic colloid and the edge of the back photovoltaic glass plate is a second distance.

[0013] Optionally, the second distance is 0 - 3 mm.

[0014] Optionally, the distance between the water-blocking hot-melt elastic colloid and the edge of the encapsulation adhesive film is a third distance; the third distance is suitable for accommodating the excess adhesive liquid of the encapsulation adhesive film during the lamination process and the excess adhesive liquid of the water-blocking hot-melt elastic colloid during the lamination process;

[0015] A vacuum chamber is formed between the front photovoltaic glass plate, the solar cell string, the side surface of the water-blocking hot-melt elastic colloid and the side surface of the encapsulation adhesive film.

[0016] Optionally, the third distance is 0 - 4 mm.

[0017] Optionally, the width of the water-blocking hot-melt elastic colloid is 6 mm - 8 mm, and the thickness is 1.5 mm - 2 mm.

[0018] Optionally, the water-blocking hot-melt elastic colloid is a butyl rubber layer.

[0019] Optionally, the light transmittance of the front photovoltaic glass plate is greater than 95%.

[0020] Optionally, the area of the encapsulation adhesive film is greater than that of the solar cell string;

[0021] The distance between the edge of the encapsulation adhesive film and the edge of the solar cell string is 1 mm - 3 mm.

[0022] Optionally, the thickness of the front photovoltaic glass plate is 1.5 mm - 3.2 mm;

[0023] The thickness of the back photovoltaic glass plate is 1.5 mm - 3.2 mm.

[0024] The technical solution of the present utility model has the following advantages:

[0025] (1) First, the encapsulation adhesive film is removed between the solar cell string and the front photovoltaic glass plate, so that there is a first spacing between the solar cell string and the front photovoltaic glass plate. After the sunlight passes through the front photovoltaic glass plate, it directly reaches the surface of the solar cell string, greatly improving the utilization rate of light by the solar cell string, thereby improving the power, efficiency, and CTM value of the module. Second, by setting a water-blocking hot-melt elastic colloid at the edge around the back photovoltaic glass plate, the water-blocking property, sealing property, and weather resistance of the solar cell module are improved. At the same time, the solar cell string is protected from stress damage by the front photovoltaic glass plate during the lamination process. Third, the front photovoltaic glass plate is connected to the first surface of the water-blocking hot-melt elastic colloid, and the second surface of the water-blocking hot-melt elastic colloid is connected to the back photovoltaic glass plate, improving the sealing and stability of the module. Finally, a vacuum chamber is formed between the side surfaces of the front photovoltaic glass plate, the solar cell string, and the water-blocking hot-melt elastic colloid, improving the sealing and reliability of the solar cell module and extending the service life of the module.

[0026] (2) By setting a second spacing between the water-blocking hot-melt elastic colloid and the edge of the back photovoltaic glass plate, the second spacing can accommodate the excess glue of the water-blocking hot-melt elastic colloid during the lamination process, ensuring the water-blocking performance and sealing performance of the module, improving the reliability and service life of the module, and preventing the excess glue from overflowing and causing pollution to the surface of the module.

[0027] (3) By setting a third spacing between the water-blocking hot-melt elastic colloid and the edge of the encapsulation adhesive film; the third spacing can accommodate the excess glue of the encapsulation adhesive film and the excess glue of the water-blocking hot-melt elastic colloid during the lamination process, ensuring the water-blocking performance and sealing performance of the module, improving the reliability and service life of the module, and preventing the excess glue of the water-blocking hot-melt elastic colloid from overflowing and causing pollution to the surface of the module, and also preventing the excess encapsulation glue from overflowing onto the surface of the solar cell string during the lamination process, reducing the effective light-receiving area and efficiency of the solar cell string, etc. Description of the Drawings

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a solar cell module according to an embodiment of the present invention;

[0030] Figure 2Schematic structural diagram of a solar cell module according to an embodiment of the present utility model.

[0031] Explanation of reference numerals:

[0032] 10 - Front photovoltaic glass plate; 20 - Back photovoltaic glass plate; 30 - Solar cell string; 40 - Encapsulation adhesive film; 50 - Water-blocking hot-melt elastic colloid. Specific implementation manners

[0033] To solve the problem that in the existing solar cell module, the conversion efficiency of ultraviolet light is relatively low, the ultraviolet light cannot be fully utilized, and the further improvement of the efficiency of the solar cell module is restricted, the present utility model provides a solar cell module, including: a front photovoltaic glass plate and a back photovoltaic glass plate which are oppositely arranged; a solar cell string located between the front photovoltaic glass plate and the back photovoltaic glass plate; an encapsulation adhesive film located between the solar cell string and the back photovoltaic glass plate; a water-blocking hot-melt elastic colloid located at the edge around the back photovoltaic glass plate, the first surface of the water-blocking hot-melt elastic colloid is connected to the front photovoltaic glass plate, and the second surface of the water-blocking hot-melt elastic colloid is connected to the back photovoltaic glass plate; a vacuum chamber is formed between the side surfaces of the front photovoltaic glass plate, the solar cell string and the water-blocking hot-melt elastic colloid; there is a first distance between the solar cell string and the front photovoltaic glass plate.

[0034] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work 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 understood as indicating or implying relative importance.

[0035] Referring to Figure 1 , this embodiment provides a solar cell module, including:

[0036] A front photovoltaic glass plate 10 and a back photovoltaic glass plate 20 which are oppositely arranged;

[0037] A solar cell string 30 located between the front photovoltaic glass plate 10 and the back photovoltaic glass plate 20;

[0038] An encapsulation adhesive film 40 located between the solar cell string 30 and the back photovoltaic glass plate 20;

[0039] The water-blocking hot-melt elastic colloid 50 is located at the edge around the back photovoltaic glass plate 20. The first surface of the water-blocking hot-melt elastic colloid 50 is connected to the front photovoltaic glass plate 10, and the second surface of the water-blocking hot-melt elastic colloid 50 is connected to the back photovoltaic glass plate 20;

[0040] A vacuum chamber is formed between the front photovoltaic glass plate 10, the solar cell string 30 and the side surface of the water-blocking hot-melt elastic colloid 50; there is a first spacing between the solar cell string 30 and the front photovoltaic glass plate 10.

[0041] Specifically, the first spacing is 0.5 mm - 1.5 mm, such as 0.5 mm, 1 mm, 1.5 mm, etc. The air pressure in the vacuum chamber is less than 10 Pa, such as 10 -3 Pa, 10 -3 Pa, 10 -4 Pa, etc.

[0042] This embodiment provides a solar cell module. First, the encapsulation glue film is cancelled between the solar cell string 30 and the front photovoltaic glass plate 10, so that there is a first spacing between the solar cell string 30 and the front photovoltaic glass plate 10. After the sunlight passes through the front photovoltaic glass plate 10, it directly reaches the surface of the solar cell string 30, greatly improving the utilization rate of light by the solar cell string 30, thereby improving the power, efficiency and CTM value of the module. Second, by arranging the water-blocking hot-melt elastic colloid 50 at the edge around the back photovoltaic glass plate 20, the water-blocking property, sealing property and weather resistance of the solar cell module are improved, and at the same time, the solar cell string 30 is protected from stress damage by the front photovoltaic glass plate 10 during the lamination process. Third, the first surface of the water-blocking hot-melt elastic colloid 50 is connected to the front photovoltaic glass plate 10, and the second surface of the water-blocking hot-melt elastic colloid 50 is connected to the back photovoltaic glass plate 20, improving the sealing property and stability of the module. Finally, by forming a vacuum chamber between the front photovoltaic glass plate 10, the solar cell string 30 and the side surface of the water-blocking hot-melt elastic colloid 50, the sealing property and reliability of the solar cell module are improved, and the service life of the module is extended.

[0043] Further, in this embodiment, as Figure 2 shown, the distance between the water-blocking hot-melt elastic colloid 50 and the edge of the back photovoltaic glass plate 20 is the second spacing.

[0044] By setting a second spacing between the water-blocking hot-melt elastic colloid 50 and the edge of the back photovoltaic glass plate 20, the second spacing can accommodate the excess glue liquid of the water-blocking hot-melt elastic colloid 50 during the lamination process, ensuring the water-blocking performance and sealing performance of the module, improving the reliability and service life of the module, and at the same time preventing the excess glue liquid from overflowing and causing pollution to the surface of the module.

[0045] Further, in this embodiment, the second spacing is 0 - 3 mm, such as 0, 1 mm, 2 mm, 3 mm, etc.

[0046] As Figure 1 shown, the second spacing is 0, and at this time, the second spacing has been completely filled with excess adhesive during the lamination process. As Figure 2 shown, the second spacing is greater than 0 and less than or equal to 3 mm, and at this time, the second spacing has not been completely filled with excess adhesive during the lamination process.

[0047] Further, in this embodiment, the distance between the water - blocking hot - melt elastic colloid 50 and the edge of the encapsulation adhesive film 40 is the third spacing; the third spacing is suitable for accommodating the excess adhesive of the encapsulation adhesive film 40 during the lamination process and the excess adhesive of the water - blocking hot - melt elastic colloid 50 during the lamination process; a vacuum chamber is formed between the front photovoltaic glass plate 10, the solar cell string 30, the side surface of the water - blocking hot - melt elastic colloid 50, and the side surface of the encapsulation adhesive film 40.

[0048] By setting the third spacing between the water - blocking hot - melt elastic colloid 50 and the edge of the encapsulation adhesive film 40; the third spacing can accommodate the excess adhesive of the encapsulation adhesive film 40 during the lamination process and the excess adhesive of the water - blocking hot - melt elastic colloid 50 during the lamination process, ensuring the water - blocking performance and sealing performance of the component, improving the reliability and service life of the component. At the same time, it prevents the excess adhesive of the water - blocking hot - melt elastic colloid from overflowing and causing pollution to the surface of the component, and also prevents the excess encapsulation adhesive from overflowing onto the surface of the solar cell string during the lamination process, reducing the effective light - receiving area and efficiency of the solar cell string, etc.

[0049] Further, in this embodiment, the third spacing is 0 - 4 mm, such as 0, 1 mm, 2 mm, 3 mm, 4 mm, etc.

[0050] As Figure 1 shown, the third spacing is 0, and at this time, the third spacing has been completely filled with excess adhesive during the lamination process. As Figure 2 shown, the third spacing is greater than 0 and less than or equal to 4 mm, and at this time, the third spacing has not been completely filled with excess adhesive during the lamination process.

[0051] Further, in this embodiment, the width of the water - blocking hot - melt elastic colloid 50 is 6 mm - 8 mm, such as 6 mm, 6.5 mm, 7.5 mm, etc.; the thickness is 1.5 mm - 2 mm, such as 1.5 mm, 1.7 mm, 1.8 mm, 2 mm, etc.

[0052] Further, in this embodiment, the water - blocking hot - melt elastic colloid 50 is a butyl rubber layer.

[0053] First, butyl rubber has excellent sealing performance, which can effectively prevent water vapor and other external substances from entering the interior of the photovoltaic module, thereby protecting the surface and internal circuit of the solar cell from contamination and corrosion. Secondly, butyl rubber has excellent weather resistance and can maintain stability under various environmental conditions, being not easily aged and deteriorated, which helps to extend the service life and long-term stability of the photovoltaic module. Thirdly, butyl rubber has good plasticity and adhesiveness during the process, can adapt to the irregular shape of the photovoltaic module surface and the expansion and contraction of the material, and ensure a firm connection between the butyl rubber and the photovoltaic module. Finally, butyl rubber also has high tensile strength and wear resistance, can withstand the influence brought by mechanical stress and environmental changes, and maintain the integrity of the glue layer and the sealing of the module.

[0054] In other embodiments, the water-blocking hot-melt elastic colloid 50 can also be other hot-melt elastic colloids with water-blocking performance.

[0055] Further, in this embodiment, the light transmittance of the front photovoltaic glass plate 10 is greater than 95%, such as 96%, 98%, 99%.

[0056] Since the light transmittance of the front photovoltaic glass plate is greater than that of the encapsulation adhesive film, therefore, compared with the traditional encapsulation method, the encapsulation adhesive film between the solar cell string 30 and the front photovoltaic glass plate 10 is cancelled in this embodiment, so that there is a first spacing between the solar cell string 30 and the front photovoltaic glass plate 10. After the sunlight passes through the front photovoltaic glass plate 10, it directly reaches the surface of the solar cell string 30, greatly improving the light utilization rate of the battery chip, thereby improving the power, efficiency and CTM value of the module.

[0057] Further, in this embodiment, the area of the encapsulation adhesive film 40 is greater than that of the solar cell string 30; the distance between the edge of the encapsulation adhesive film and the edge of the solar cell string is 1 mm - 3 mm, such as 1 mm, 2 mm, 3 mm, etc. The area of the encapsulation adhesive film 40 being greater than that of the solar cell string 30 can ensure that the solar cell string is completely adhered to the back photovoltaic glass plate, ensuring the stability of the solar cell string.

[0058] Further, in this embodiment, the thickness of the front photovoltaic glass plate 10 is 1.5 mm - 3.2 mm, such as 1.5 mm, 2 mm, 3 mm, 3.2 mm, etc.;

[0059] The thickness of the back photovoltaic glass plate 20 is 1.5 mm - 3.2 mm, such as 1.5 mm, 2 mm, 3 mm, 3.2 mm, etc.

[0060] In other embodiments, the thicknesses of the front photovoltaic glass plate 10 and the back photovoltaic glass plate 20 can be selected according to actual requirements, and this embodiment does not limit this.

[0061] Obviously, the above embodiments are merely examples given for clear illustration and are 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 utility model.

Claims

1. A solar cell module, characterized in that: include: A front photovoltaic glass panel and a back photovoltaic glass panel are arranged opposite to each other; A solar cell string is located between the front photovoltaic glass panel and the back photovoltaic glass panel; An encapsulation film is located between the solar cell string and the back photovoltaic glass panel; A water-blocking hot-melt elastic colloid is located at the edges around the rear photovoltaic glass panel, a first surface of the water-blocking hot-melt elastic colloid is connected to the front photovoltaic glass panel, and a second surface of the water-blocking hot-melt elastic colloid is connected to the rear photovoltaic glass panel; A vacuum chamber is formed between the front photovoltaic glass plate, the solar cell string and the side surface of the water-blocking hot-melt elastic colloid; and a first distance is provided between the solar cell string and the front photovoltaic glass plate.

2. The solar cell assembly according to claim 1, characterized in that: The distance between the water-blocking hot-melt elastic colloid and the edge of the rear photovoltaic glass panel is a second spacing.

3. The solar cell assembly according to claim 2, characterized in that: The second spacing is 0-3 mm.

4. The solar cell assembly according to claim 3, characterized in that: The distance between the water-blocking hot-melt elastic colloid and the edge of the packaging film is a third distance; the third distance is suitable for accommodating excess glue of the packaging film during the lamination process and excess glue of the water-blocking hot-melt elastic colloid during the lamination process; A vacuum chamber is formed between the front photovoltaic glass plate, the solar cell string, the side surface of the water-blocking hot-melt elastic colloid, and the side surface of the packaging film.

5. The solar cell assembly according to claim 4, characterized in that: The third spacing is 0-4 mm.

6. The solar cell assembly according to claim 5, characterized in that The water-blocking hot-melt elastic colloid has a width of 6 mm to 8 mm and a thickness of 1.5 mm to 2 mm.

7. The solar cell assembly according to claim 6, characterized in that: The water-blocking hot-melt elastic colloid is a butyl rubber layer.

8. The solar cell assembly according to claim 1, characterized in that: The light transmittance of the front photovoltaic glass panel is greater than 95%.

9. The solar cell assembly according to claim 1, characterized in that: The area of ​​the packaging film is larger than that of the solar cell string; The distance between the edge of the packaging film and the edge of the solar cell string is 1 mm-3 mm.

10. The solar cell assembly according to claim 1, characterized in that: The thickness of the front photovoltaic glass panel is 1.5 mm to 3.2 mm; The thickness of the rear photovoltaic glass plate is 1.5 mm to 3.2 mm.

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