A photovoltaic soldering ribbon with rare earth laser material

Abstract

This invention discloses a photovoltaic bonding strip with rare-earth laser material, comprising a copper reflective base strip and a copper flat base strip. The copper reflective base strip and the copper flat base strip are fixedly connected by a flexible copper strip. A copper substrate is fixedly connected to the top of the copper reflective base strip. A serrated reflective groove is provided at the top of the copper substrate. Laser soil embedding grooves are formed inside the sidewalls of the reflective grooves. Rare-earth laser crystals are placed inside the laser soil embedding grooves. Reinforcing bonding layers are provided on the sidewalls of the reflective grooves at both ends of the laser soil embedding grooves. A reinforcing tin-plated bonding layer is coated on the bottom of the copper reflective base strip and the top of the copper flat base strip. A solar panel is provided at the other end of the reinforcing tin-plated bonding layer connecting the copper reflective base strip and the copper flat base strip. The advantages of this invention compared to the prior art are: stable connection to the solar panel and higher photoelectric conversion efficiency.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic welding strip technology, specifically to a photovoltaic welding strip with rare earth laser material. Background Technology

[0002] Solder ribbon is a crucial raw material in the photovoltaic (PV) module welding process. Its quality directly impacts the PV module's current collection efficiency, significantly affecting its power output. For manual welding, the softer the solder ribbon, the better. Soft ribbon makes good contact with the solar cells after the soldering iron passes through, resulting in minimal stress and reduced breakage. However, excessively soft ribbon has lower tensile strength and is more prone to breakage. For automated welding processes, slightly stiffer ribbon is preferable. This facilitates straightening and pressure welding by the welding machine. Excessively soft ribbon is easily deformed during machine welding, reducing the product yield. Ordinary PV solder ribbon lacks reflectivity, wasting light energy. Reflective PV solder ribbon, on the other hand, reflects all light back to the power generation unit, reducing power output.

[0003] The segmented photovoltaic ribbon described in Publication No. CN114583002A has an angle between the first and second inclined sides of 80° and 150°. This avoids both excessively thick first coating due to excessively high vertical distance or too small angle, and poor reflectivity due to excessively small vertical distance or too large angle, thus achieving a balance between ensuring reflectivity and reducing the cost of photovoltaic modules. The photovoltaic ribbon described in Publication No. CN112864264A has two symmetrically arranged protrusions along its length, forming a groove between them. This groove design provides a buffer space for the ribbon body, improving its overall strength and tensile strength. The depth of the curved surface near the groove is greater than the depth near the edge of the ribbon body. The ribbon body has a structure that is thicker in the middle and thinner at both ends. This structural design increases the absorption area of ​​sunlight and improves the photoelectric conversion efficiency of the photovoltaic ribbon. However, existing technologies still have shortcomings:

[0004] Although existing technologies form irregular structures on the surface of photovoltaic ribbons to increase the light radiation angle and improve the photoelectric conversion efficiency of photovoltaic ribbons, they cannot directly affect the light itself, resulting in a relatively low conversion efficiency. Furthermore, the main body is made of a single piece of hard copper material, which is inconvenient for connecting solar panels. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects and provide a photovoltaic welding strip with laser soil that provides stable connection to the solar panel and more efficient photoelectric conversion.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: a photovoltaic welding strip with rare earth laser material, comprising a copper reflective base strip and a copper flat base strip, wherein the copper reflective base strip and the copper flat base strip are fixedly connected by a soft copper strip, a copper substrate is fixedly connected to the top of the copper reflective base strip, a serrated reflective groove is provided at the top of the copper substrate, a laser soil embedding groove is formed inside the side wall of the reflective groove, a rare earth laser crystal is disposed inside the laser soil embedding groove, a reinforcing welding layer is provided on the side wall of the reflective groove at both ends of the laser soil embedding groove, a reinforcing tin-plated welding layer is coated on the bottom end of the copper reflective base strip and the top end of the copper flat base strip, and a solar panel is disposed at the other end of the reinforcing tin-plated welding layer connecting the copper reflective base strip and the copper flat base strip.

[0007] A method for fabricating photovoltaic ribbons with rare-earth laser materials includes the following steps:

[0008] S1. After melting the copper material, it undergoes continuous casting, rolling and annealing processes, and then is drawn and cut by a stranding machine to form a flat copper base strip. Oxygen-free copper is then die-cast to form a copper plate combining the copper reflective base strip and the copper substrate.

[0009] S2. Melt both ends of the soft copper strip at high temperature, then connect it with the copper reflective base strip and the copper flat base strip, and then cool it.

[0010] S3. Using a precision grooving machine, several serrated reflective grooves are made on the top of the copper substrate, and rectangular grooves are also made on the walls of the reflective grooves using the same precision grooving machine.

[0011] S4. Fill the rectangular groove with trapezoidal yttrium aluminum garnet crystals, and then use high temperature to remove the softened copper substrate at both ends of the rectangular groove until the copper substrate adheres to the trapezoidal yttrium aluminum garnet crystals to form the same trapezoidal laser soil embedding groove, and then cool and fix it.

[0012] S5. After the tin plating material is melted at high temperature, it is applied sequentially to both ends of the laser soil burial trench and the inside of the arc-shaped fixing trench using a precision air knife tin plating device to form a reinforced tin plating layer and a reinforced welding layer.

[0013] As an improvement, the reinforced tin-plated solder layer includes an arc-shaped fixing groove formed at the bottom end of the copper reflective base strip and the top end of the copper flat base strip, and the inside of the arc-shaped fixing groove is coated with a tin-plated solder surface layer.

[0014] As an improvement, the thickness of the reinforced tin plating layer is 15-18 μm, and the reinforced tin plating layer is made using alkaline tin plating.

[0015] As an improvement, the thickness of the tin plating layer on the welding surface is 20 μm.

[0016] As an improvement, the rare earth laser crystal is made of yttrium aluminum garnet crystal, and the thickness of the yttrium aluminum garnet crystal is 2.5 mm.

[0017] As an improvement, the laser soil burial trench has a trapezoidal structure, and the yttrium aluminum garnet crystal is fitted inside the laser soil burial trench.

[0018] As an improvement, the soft copper strip is an annealed soft copper alloy strip.

[0019] The advantages of this invention compared to existing technologies are as follows: This invention sets serrated reflective grooves on a copper substrate. By enhancing the refraction of sunlight through the reflective grooves themselves, more light is concentrated on the surface of the solar panel, improving the absorption efficiency of sunlight. Simultaneously, this invention creates laser soil embedding grooves on the walls of the reflective grooves, using these grooves to fix and add laser soil materials such as yttrium aluminum garnet crystals. These laser soil materials, also known as rare-earth laser materials, possess the ability to convert light and exhibit stronger monochromaticity, directionality, and coherence. The coherence is used to alter the wave vibration frequency and phase of sunlight, forming high-energy sunlight weaker than laser light. The stronger directionality, combined with the refraction effect, precisely delivers the enhanced sunlight to the surface of the solar panel, further improving the conversion efficiency of sunlight. Furthermore, this invention utilizes soft copper strips to connect the copper reflective baseband and the copper flat baseband, ensuring good connection even when the solar panel positions and heights differ. Attached Figure Description

[0020] Figure 1 This is a top view schematic diagram of a photovoltaic welding ribbon with rare earth laser material according to the present invention.

[0021] Figure 2 This is a front view schematic diagram of a photovoltaic welding ribbon with rare earth laser material according to the present invention.

[0022] Figure 3 This is a side cross-sectional schematic diagram of a photovoltaic welding strip copper reflective substrate with rare earth laser material according to the present invention.

[0023] Figure 4 This is a side cross-sectional schematic diagram of a photovoltaic solder strip copper flat substrate with rare earth laser material according to the present invention.

[0024] Figure 5 This is a three-dimensional structural diagram of a photovoltaic solder ribbon copper flat substrate with rare earth laser material according to the present invention.

[0025] As shown in the figure: 1. Copper reflective base strip; 2. Copper flat base strip; 3. Soft copper strip; 4. Copper substrate; 5. Reflective groove; 6. Laser soil embedding groove; 7. Rare earth laser crystal; 8. Reinforced solder layer; 9. Reinforced tin-plated solder layer; 10. Battery panel; 11. Arc-shaped fixing groove; 12. Tin-plated layer on the welding surface. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] Example 1: A photovoltaic welding strip with rare earth laser material includes a copper reflective base strip 1 and a copper flat base strip 2. The copper reflective base strip 1 and the copper flat base strip 2 are fixedly connected by a soft copper strip 3. A copper substrate 4 is fixedly connected to the top of the copper reflective base strip 1. A serrated reflective groove 5 is provided at the top of the copper substrate 4. Laser soil embedding grooves 6 are opened inside the side walls of the reflective grooves 5. Rare earth laser crystals 7 are placed inside the laser soil embedding grooves 6. Reinforcing welding layers 8 are provided at both ends of the laser soil embedding grooves 6 on the side walls of the reflective grooves 5. A reinforcing tin-plated welding layer 9 is coated on the bottom of the copper reflective base strip 1 and the top of the copper flat base strip 2. A solar panel 10 is provided at the other end of the reinforcing tin-plated welding layer 9 connecting the copper reflective base strip 1 and the copper flat base strip 2. The reinforcing tin-plated welding layer 9 includes an arc-shaped fixing groove 11 opened at the bottom of the copper reflective base strip 1 and the top of the copper flat base strip 2. A welding surface tin-plated layer 12 is coated inside the arc-shaped fixing groove 11. The thickness of the reinforced tin-plated solder layer 9 is 15μm, the thickness of the tin-plated layer 12 on the soldering surface is 20μm, the rare earth laser crystal 7 is a yttrium aluminum garnet crystal with a thickness of 2.5mm, and the soft copper strip 3 is an annealed soft copper alloy strip.

[0028] The method for manufacturing photovoltaic welding strips includes the following steps:

[0029] S1. After melting the copper material, it undergoes continuous casting, rolling and annealing processes, and then is drawn and cut by a stranding machine to form a copper flat base strip 2. Oxygen-free copper is die-cast to form a copper plate combining a copper reflective base strip 1 and a copper substrate 4.

[0030] S2. Melt both ends of the soft copper strip 3 at high temperature, then connect it with the copper reflective base strip 1 and the copper flat base strip 2, and then cool it.

[0031] S3. Using a precision grooving machine, several serrated reflective grooves 5 are made on the top of the copper substrate 4. Similarly, rectangular grooves are made on the wall of the reflective grooves 5 using a precision grooving machine.

[0032] S4. Fill the rectangular groove with trapezoidal yttrium aluminum garnet crystals, and then use high temperature to remove the softened copper substrate 4 at both ends of the rectangular groove until the copper substrate adheres to the trapezoidal yttrium aluminum garnet crystals to form the same trapezoidal laser soil embedding groove 6, and then cool and fix it.

[0033] S5. After the tin plating material is melted at high temperature, it is sequentially coated onto both ends of the laser soil burial groove 6 and the inside of the arc-shaped fixing groove 11 using a precision air knife tin plating device to form a reinforced tin plating layer 9 and a reinforced solder layer 8.

[0034] Example 2: A photovoltaic welding strip with rare earth laser material includes a copper reflective base strip 1 and a copper flat base strip 2. The copper reflective base strip 1 and the copper flat base strip 2 are fixedly connected by a soft copper strip 3. A copper substrate 4 is fixedly connected to the top of the copper reflective base strip 1. A serrated reflective groove 5 is provided at the top of the copper substrate 4. Laser soil embedding grooves 6 are opened inside the side walls of the reflective grooves 5. Rare earth laser crystals 7 are placed inside the laser soil embedding grooves 6. Reinforcing welding layers 8 are provided at both ends of the laser soil embedding grooves 6 on the side walls of the reflective grooves 5. A reinforcing tin-plated welding layer 9 is coated on the bottom of the copper reflective base strip 1 and the top of the copper flat base strip 2. A solar panel 10 is provided at the other end of the reinforcing tin-plated welding layer 9 connecting the copper reflective base strip 1 and the copper flat base strip 2. The reinforcing tin-plated welding layer 9 includes an arc-shaped fixing groove 11 opened at the bottom of the copper reflective base strip 1 and the top of the copper flat base strip 2. A welding surface tin-plated layer 12 is coated inside the arc-shaped fixing groove 11. The thickness of the reinforced tin-plated solder layer 9 is 18μm, the thickness of the tin-plated layer 12 on the soldering surface is 20μm, the rare earth laser crystal 7 is a silicate glass crystal with a thickness of 3mm, and the soft copper strip 3 is an annealed soft copper alloy strip.

[0035] The method for manufacturing photovoltaic welding strips includes the following steps:

[0036] S1. After melting the copper material, it undergoes continuous casting, rolling and annealing processes, and then is drawn and cut by a stranding machine to form a copper flat base strip 2. Oxygen-free copper is die-cast to form a copper plate combining a copper reflective base strip 1 and a copper substrate 4.

[0037] S2. Melt both ends of the soft copper strip 3 at high temperature, then connect it with the copper reflective base strip 1 and the copper flat base strip 2, and then cool it.

[0038] S3. Using a precision grooving machine, several serrated reflective grooves 5 are made on the top of the copper substrate 4. Similarly, rectangular grooves are made on the wall of the reflective grooves 5 using a precision grooving machine.

[0039] S4. Fill the rectangular groove with trapezoidal silicate glass crystals, and then use high temperature to remove the softened copper substrate 4 at both ends of the rectangular groove until the copper substrate fits the trapezoidal silicate glass crystals to form the same trapezoidal laser soil embedding groove 6, and then cool and fix it.

[0040] S5. After the tin plating material is melted at high temperature, it is sequentially coated onto both ends of the laser soil burial groove 6 and the inside of the arc-shaped fixing groove 11 using a precision air knife tin plating device to form a reinforced tin plating layer 9 and a reinforced solder layer 8.

[0041] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A photovoltaic welding ribbon with rare earth laser material, characterized in that: The system includes a copper reflective baseband (1) and a copper flat baseband (2). The copper reflective baseband (1) and the copper flat baseband (2) are fixedly connected by a soft copper strip (3). A copper substrate (4) is fixedly connected to the top of the copper reflective baseband (1). A serrated reflective groove (5) is provided at the top of the copper substrate (4). A laser soil burial groove (6) is opened inside the side wall of the reflective groove (5). A rare earth laser crystal (7) is provided inside the laser soil burial groove (6). A reinforcing solder layer (8) is provided at both ends of the laser soil burial groove (6) on the side wall of the reflective groove (5). A reinforcing tin-plated solder layer (9) is coated on the bottom of the copper reflective baseband (1) and the top of the copper flat baseband (2). A battery panel (10) is provided at the other end of the reinforcing tin-plated solder layer (9) connecting the copper reflective baseband (1) and the copper flat baseband (2).

2. The photovoltaic welding ribbon with rare earth laser material according to claim 1, characterized in that: The reinforced tin-plated solder layer (9) includes an arc-shaped fixing groove (11) at the bottom of the copper reflective base strip (1) and the top of the copper flat base strip (2), and the inside of the arc-shaped fixing groove (11) is coated with a soldering surface tin-plated layer (12).

3. The photovoltaic welding ribbon with rare earth laser material according to claim 1, characterized in that: The thickness of the reinforced tin plating layer (9) is 15-18 μm, and the reinforced tin plating layer (9) is made of alkaline tin plating.

4. A photovoltaic welding ribbon with rare earth laser material according to claim 2, characterized in that: The thickness of the tin plating layer (12) on the welding surface is 20 μm.

5. A photovoltaic welding ribbon with rare earth laser material according to claim 1, characterized in that: The rare earth laser crystal (7) is made of yttrium aluminum garnet crystal, and the thickness of the yttrium aluminum garnet crystal is 2.5 mm.

6. A photovoltaic welding ribbon with rare earth laser material according to claim 5, characterized in that: The laser soil burial trench (6) has a trapezoidal structure, and the yttrium aluminum garnet crystal is fitted inside the laser soil burial trench (6).

7. A photovoltaic welding ribbon with rare earth laser material according to claim 1, characterized in that: The soft copper strip (3) is an annealed soft copper alloy strip.

8. A method for fabricating photovoltaic ribbon with rare earth laser material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. After melting the copper material, it is continuously cast, rolled and annealed, and then drawn and cut by a stranding machine to form a flat copper base strip (2). Oxygen-free copper is die-cast to form a copper plate combining a copper reflective base strip (1) and a copper substrate (4). S2. Melt the soft copper strip (3) at high temperature and then connect it with the copper reflective base strip (1) and the copper flat base strip (2) and then cool it. S3. Using a precision grooving machine, several serrated reflective grooves (5) are opened on the top of the copper substrate (4), and rectangular grooves are also opened on the wall of the reflective grooves (5) using the same precision grooving machine. S4. Fill the rectangular groove with trapezoidal yttrium aluminum garnet crystals, and then use high temperature to remove the softened copper substrate at both ends of the rectangular groove (4) until the copper substrate adheres to the trapezoidal yttrium aluminum garnet crystals to form the same trapezoidal laser soil burial groove (6) and then cool and fix it. S5. After the tin plating material is melted at high temperature, it is applied sequentially to both ends of the laser soil burial groove (6) and the inside of the arc-shaped fixing groove (11) using a precision air knife tin plating device to form a reinforced tin plating layer (9) and a reinforced solder layer (8).

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