High-reflectivity triangular solder strip for photovoltaic module

Abstract

The utility model relates to the technical field of photovoltaic equipment, in particular to a high-reflectivity triangular welding strip for a photovoltaic module, which comprises a triangular conductive substrate, and aluminum layers are arranged on two light receiving reflecting surfaces and a backlight welding surface of the triangular conductive substrate; transparent protection layers are arranged on the sides, away from the light receiving reflection face, of the two aluminum layers, and a tin-lead alloy layer is arranged on the side, away from the backlight welding face, of one aluminum layer. The aluminum layers are arranged on the two light receiving reflecting surfaces and one backlight welding surface of the triangular conductive substrate, so that the reflectivity of the triangular conductive substrate is effectively improved compared with that of a tinned surface; and the transparent protective layers are arranged on the sides, far away from the light receiving and reflecting surface, of the two aluminum layers, so that the aluminum layers are effectively protected and prevented from being oxidized, and the solar cell module has high reflectivity and corrosion resistance, and can effectively reflect light to the surface of a cell, thereby improving the photoelectric conversion efficiency of the module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic equipment technology, and more specifically, to a high-reflectivity triangular welding strip for photovoltaic modules. Background Technology

[0002] Solar photovoltaic modules require solder ribbons to be welded to the solar cells to transmit current and generate electricity. Currently, most solder ribbons are copper strips with full-surface tin plating, which suffers from problems such as high tin consumption, low reflectivity of the non-soldering surfaces, and imprecise surface texture. This results in low light utilization and affects the module's power output.

[0003] To improve light utilization, triangular-shaped solder strips have been developed in existing technologies. In these triangular solder strips, two sides are used for light reflection, and one side is used for welding. However, conventional triangular solder strips in existing technologies still suffer from low reflectivity, failing to effectively improve module power.

[0004] For example, CN118218393A discloses a high-reflectivity triangular conductive wire for low-temperature welding and its preparation method. Although the reflectivity of the triangular conductive wire can be improved through processes such as rolling annealing, vapor deposition, and hot-dip plating of low-temperature solder alloy, the uniformity and stability of the coating of the triangular conductive wire in this application are poor, which affects its reflective effect, resulting in a low reflectivity and the inability to effectively improve the power of the component. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a high reflectivity triangular welding strip for photovoltaic modules.

[0006] The technical solution adopted in this utility model is:

[0007] A high-reflectivity triangular solder strip for photovoltaic modules includes: a triangular conductive substrate, wherein aluminum layers are disposed on two light-reflecting surfaces and one backlight soldering surface of the triangular conductive substrate; a transparent protective layer is disposed on the side of the two aluminum layers away from the light-reflecting surfaces, and a tin-lead alloy layer is disposed on the side of one aluminum layer away from the backlight soldering surface.

[0008] Furthermore, the triangular conductive substrate is a copper substrate.

[0009] Furthermore, the contact surface between the triangular conductive substrate and the aluminum layer is a rough adhesion surface.

[0010] Furthermore, the aluminum layer comprises: a chemically plated aluminum layer formed on two light-reflecting surfaces and a backlight-welding surface, and an electroplated aluminum layer formed on the outside of the chemically plated aluminum layer.

[0011] Furthermore, the contact surface between the aluminum layer and the transparent protective layer is a polished surface.

[0012] Furthermore, the transparent protective layer is a polysiloxane-based wear-resistant transparent coating.

[0013] Furthermore, the thickness of the transparent protective layer is 0.5um-2um.

[0014] Furthermore, the triangular conductive substrate has an isosceles triangular structure, and the included angle between the two light-reflecting surfaces of the triangular conductive substrate is 60-90°.

[0015] Furthermore, the width of the bottom of the triangular conductive substrate is 0.2mm-0.8mm, and the height is 0.2mm-0.8mm.

[0016] Furthermore, the thickness of the tin-lead alloy layer is 0.01-0.05 mm.

[0017] As can be seen from the above solution, the beneficial effects of this utility model are as follows:

[0018] In this invention, a high-reflectivity triangular solder strip for photovoltaic modules features an aluminum layer on both light-reflecting surfaces and one backlight soldering surface of the triangular conductive substrate, effectively improving reflectivity compared to a tin-plated surface. A transparent protective layer is provided on the side of each aluminum layer furthest from the light-reflecting surface, effectively protecting the aluminum layer and preventing oxidation. This invention achieves both high reflectivity and corrosion resistance, effectively reflecting light to the cell surface and thus improving the photoelectric conversion efficiency of the module. Furthermore, in this invention, a tin-lead alloy layer is only provided on one aluminum layer furthest from the backlight soldering surface, reducing tin consumption and significantly saving tin usage, thereby lowering costs.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 A schematic diagram of a high-reflectivity triangular solder strip for photovoltaic modules provided in an embodiment of this utility model;

[0022] Figure 2 A schematic diagram of the triangular conductive substrate provided in an embodiment of this utility model;

[0023] Figure 3 A schematic diagram showing the connection between the triangular conductive substrate and the aluminum layer provided in this embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram showing the connection between the triangular conductive substrate and the aluminum layer and tin-lead alloy layer provided in an embodiment of the present invention.

[0025] Icon: Triangular conductive substrate 1; Aluminum layer 2; Transparent protective layer 3; Tin-lead alloy layer 4. Detailed Implementation

[0026] To ensure a clear and complete description of the technical solutions in the embodiments of this utility model below, in conjunction with the accompanying drawings, it is evident that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0028] Example 1

[0029] Please see Figures 1-4 This utility model provides a high-reflectivity triangular solder strip for photovoltaic modules, comprising: a triangular conductive substrate 1, wherein aluminum layers 2 are disposed on both light-reflecting surfaces and one backlight soldering surface of the triangular conductive substrate 1; a transparent protective layer 3 is disposed on the side of the two aluminum layers 2 away from the light-reflecting surfaces, and a tin-lead alloy layer 4 is disposed on the side of one aluminum layer 2 away from the backlight soldering surface. The triangular conductive substrate 1 is a copper substrate.

[0030] The working principle and technical effects of the above technical solution are as follows:

[0031] In this invention, a high-reflectivity triangular solder ribbon for photovoltaic modules is provided with aluminum layers 2 on both light-reflecting surfaces and one backlight welding surface of the triangular conductive substrate 1. Compared with the traditional tin-plated surface, its reflectivity is effectively improved. This triangular solder ribbon can better reflect light to the battery surface, increasing the battery's absorption of light and thus improving the photoelectric conversion efficiency of the photovoltaic module. A transparent protective layer 3 is provided on the side of the two aluminum layers 2 away from the light-reflecting surfaces. The transparent protective layer 3 can effectively protect the aluminum layers 2, preventing them from oxidizing due to contact with oxygen and other substances in the external environment. This allows the triangular solder ribbon to have both high reflectivity and good corrosion resistance, extending the service life of the solder ribbon and ensuring the long-term stable operation of the photovoltaic module. A tin-lead alloy layer 4 is provided only on the side of one aluminum layer 2 away from the backlight welding surface, which facilitates welding with the battery cells. Compared with the traditional design that requires tin plating on more parts, it greatly reduces the amount of tin used. Since tin is a relatively expensive material, reducing tin consumption can significantly reduce production costs and improve the product's competitiveness in the market.

[0032] In addition, the welding strip structure of this utility model is finely designed, which improves the light utilization rate and facilitates welding with battery cells, thereby improving the overall performance of the module.

[0033] Example 2

[0034] Please see Figures 1-4 In the high reflectivity triangular welding strip for photovoltaic modules provided by this utility model, the contact surface between the triangular conductive substrate 1 and the aluminum layer 2 is a rough adhesion surface.

[0035] The working principle and technical effects of the above technical solution are as follows:

[0036] In a high-reflectivity triangular welding strip for photovoltaic modules, the surface of the triangular conductive substrate 1 can be roughened by a combination of mechanical grinding and chemical etching to obtain a rough adhesion surface, thereby increasing the adhesion of the coating. During the roughening process, the surface of the triangular conductive substrate 1 can be ground with sandpaper first, and then it can be immersed in hydrochloric acid solution for etching to make its surface rough, thereby effectively improving the connection stability between the triangular conductive substrate 1 and the aluminum layer 2.

[0037] Example 3

[0038] Please see Figures 1-4This utility model provides a high-reflectivity triangular welding strip for photovoltaic modules, wherein the aluminum layer 2 comprises: a chemically plated aluminum layer formed on two light-reflecting surfaces and one backlight welding surface, and an electroplated aluminum layer formed on the outside of the chemically plated aluminum layer. The contact surface between the aluminum layer 2 and the transparent protective layer 3 is a polished surface. The transparent protective layer 3 is a polysiloxane-based wear-resistant transparent coating. The thickness of the transparent protective layer 3 is 0.5µm-2µm.

[0039] The working principle and technical effects of the above technical solution are as follows:

[0040] In a high-reflectivity triangular welding strip for photovoltaic modules, the aluminum layer 2 includes a chemically plated aluminum layer and an electroplated aluminum layer formed on the outside of the chemically plated aluminum layer. During the coating process, chemically plated aluminum is first performed on the surface of the triangular conductive substrate 1 to form a uniform chemically plated aluminum layer. Then, an aluminum sulfate electroplating solution is prepared, and the triangular conductive substrate 1 is immersed in the electroplating solution for electroplating to form a uniform electroplated aluminum layer. After electroplating, the substrate is thoroughly cleaned with deionized water and dried to remove residual plating solution and impurities. The contact surface between the aluminum layer 2 and the transparent protective layer 3 is polished to improve its gloss. The advantages of this invention for forming a chemically plated aluminum layer and an electroplated aluminum layer sequentially in a high-reflectivity triangular welding strip for photovoltaic modules are as follows: Chemical plating deposits an aluminum layer on the surface of a triangular conductive substrate through a chemical reaction, enabling aluminum atoms to chemically bond with atoms on the conductive substrate surface, thus forming a tight and uniform bond. It effectively covers minor defects and unevenness on the conductive substrate surface, providing a good foundation for the subsequent electroplated aluminum layer and ensuring high bonding strength between the entire aluminum layer and the substrate, making it less prone to peeling. The chemical plating process does not rely on an external power source; as long as the substrate surface is in full contact with the plating solution, an aluminum layer can be uniformly deposited across the entire surface. For complex triangular conductive substrates, chemical plating can form a uniformly thick aluminum layer in all parts, including corners and edges, ensuring consistent reflectivity of the conductive substrate surface. Electroplating utilizes the principle of electrolysis, using an external power source to provide energy for the rapid reduction and deposition of aluminum ions on the conductive substrate surface. Compared to chemical plating, electroplating has a faster deposition rate and can form a thicker aluminum layer in a shorter time. The electroless plating process allows for the rapid acquisition of aluminum layer thicknesses that meet reflectivity requirements, improving production efficiency. During electroplating, parameters such as current density, plating time, and plating solution composition can be controlled to precisely manage the thickness, structure, and performance of the electroplated aluminum layer. This enables the customization of aluminum layers with specific reflectivity and physical properties to meet the needs of different photovoltaic modules, enhancing product applicability and quality stability. The electroless aluminum plating layer provides excellent adhesion to the substrate and a uniform underlayer, while the electroplated aluminum layer rapidly thickens on top, achieving precise performance control. The composite aluminum layer formed by the combination of these two processes ensures a strong bond with the substrate while meeting high reflectivity and other physical performance requirements, improving the optical and physical properties of the entire triangular weld strip. In this invention, the aluminum layer 2 exhibits better uniformity and stability, further enhancing the reflective effect. The transparent protective layer 3 is a polysiloxane-based wear-resistant transparent coating, effectively preventing oxidation and damage to the aluminum layer 2, thereby improving its aging resistance.

[0041] Example 4

[0042] Please see Figures 1-4This utility model provides a high-reflectivity triangular solder strip for photovoltaic modules. The triangular conductive substrate 1 has an isosceles triangular structure, and the included angle between the two light-reflecting surfaces of the triangular conductive substrate 1 is 60-90°. The width of the bottom of the triangular conductive substrate 1 is 0.2mm-0.8mm, and the height is 0.2mm-0.8mm. The thickness of the tin-lead alloy layer 4 is 0.01-0.05mm.

[0043] The working principle and technical effects of the above technical solution are as follows:

[0044] This invention relates to a high-reflectivity triangular welding strip for photovoltaic modules. The angle between the two light-reflecting surfaces of the triangular conductive substrate is set to 60-90°. When sunlight shines on the photovoltaic module, light rays at different angles strike the light-reflecting surfaces of the triangular welding strip. The 60-90° angle range allows incident light rays from more angles to be reflected between the two light-reflecting surfaces, effectively reflecting the light onto the photovoltaic cell surface. The 60-90° angle maintains good light reflection over a wide range of solar altitude angles, enabling the photovoltaic module to achieve high photoelectric conversion efficiency under different lighting conditions. Furthermore, the isosceles triangle structure itself has good stability, and the 60-90° angle further optimizes its mechanical properties. During the manufacturing, installation, and use of photovoltaic modules, the triangular welding strip is subjected to various external forces, such as wind and vibration. The isosceles triangular structure within this angle range can better disperse stress, making the triangular solder strip less prone to deformation or damage under stress, thus ensuring its structural integrity and stability in the photovoltaic module and facilitating its long-term stable operation; the tin-lead alloy layer 4 has a thickness of 0.01-0.05mm, which effectively reduces tin consumption and lowers costs while ensuring connection strength.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A high-reflectivity triangular welding strip for photovoltaic modules, characterized in that, include: A triangular conductive substrate (1) is provided with aluminum layers (2) on both light-reflecting surfaces and one backlight welding surface; a transparent protective layer (3) is provided on the side of the two aluminum layers (2) away from the light-reflecting surfaces, and a tin-lead alloy layer (4) is provided on the side of one aluminum layer (2) away from the backlight welding surface.

2. The high-reflectivity triangular welding strip for photovoltaic modules according to claim 1, characterized in that, The triangular conductive substrate (1) is a copper substrate.

3. The high-reflectivity triangular welding strip for photovoltaic modules according to claim 1, characterized in that, The contact surface between the triangular conductive substrate (1) and the aluminum layer (2) is a rough adhesion surface.

4. The high-reflectivity triangular welding strip for photovoltaic modules according to claim 1, characterized in that, The aluminum layer (2) includes: a chemically plated aluminum layer formed on two light-reflecting surfaces and a backlight welding surface, and an electroplated aluminum layer formed on the outside of the chemically plated aluminum layer.

5. A high-reflectivity triangular solder strip for photovoltaic modules according to claim 1, characterized in that, The contact surface between the aluminum layer (2) and the transparent protective layer (3) is a polished surface.

6. The high-reflectivity triangular welding strip for photovoltaic modules according to claim 1, characterized in that, The transparent protective layer (3) is a polysiloxane-based wear-resistant transparent coating.

7. A high-reflectivity triangular solder strip for photovoltaic modules according to claim 1, characterized in that, The thickness of the transparent protective layer (3) is 0.5um-2um.

8. A high-reflectivity triangular solder strip for photovoltaic modules according to claim 1, characterized in that, The triangular conductive substrate (1) has an isosceles triangular structure, and the included angle between the two light-reflecting surfaces of the triangular conductive substrate (1) is 60-90°.

9. A high-reflectivity triangular solder strip for photovoltaic modules according to claim 1, characterized in that, The width of the bottom of the triangular conductive substrate (1) is 0.2mm-0.8mm, and the height is 0.2mm-0.8mm.

10. A high-reflectivity triangular solder strip for photovoltaic modules according to claim 1, characterized in that, The thickness of the tin-lead alloy layer (4) is 0.01-0.05 mm.

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