Manufacturing method of photovoltaic welding strip, photovoltaic welding strip and photovoltaic module

Abstract

The invention discloses a manufacturing method of a photovoltaic welding strip, the photovoltaic welding strip and a photovoltaic module. The manufacturing method of the photovoltaic welding strip comprises the following steps: coating the surface of a welding strip body with a special material at normal temperature to obtain the photovoltaic welding strip, the special materials comprise low-melting-point glass powder, a special wax material and an organosilicon compound. According to the invention, the performance and reliability of the photovoltaic module can be improved, and the following problems of the photovoltaic module can be overcome: when the local temperature of the module formed by connecting the photovoltaic welding strips in series rises to more than 90 DEG C due to short circuit, the welding state is damaged through the mechanisms of physical change of the welding flux, decomposition of the soldering flux, thermal stress action and the like, and the reliability of the photovoltaic module is improved. And meanwhile, secreted substances are generated from the welding flux and the packaging material, and seepage of the substances further aggravates the trend that the welding strip is separated from the welding state, so that the performance and the reliability of the photovoltaic module are seriously influenced.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic modules, and particularly relates to a manufacturing method of a photovoltaic solder ribbon, a photovoltaic solder ribbon, and a photovoltaic module. Background Art

[0002] In a photovoltaic power generation system, as the core part, a photovoltaic module undertakes the key task of converting solar energy into electrical energy. A photovoltaic solder ribbon is an important component for realizing the electrical connection of battery cells inside a photovoltaic module, and its performance directly affects the overall reliability and power generation efficiency of the photovoltaic module. When a short - circuit fault occurs in a module formed by series - connected photovoltaic solder ribbons, a series of complex and potentially harmful physical changes will occur. Among them, the change in the welding state of the solder ribbon caused by a sharp increase in local temperature is particularly worthy of attention.

[0003] Currently, the commonly used welding materials for photovoltaic solder ribbons are mostly tin - lead alloys or lead - free solders. When the temperature rises above 90 degrees Celsius, approaching or even reaching the melting point range of the solder (for example, the melting point of traditional tin - lead solder is about 183 °C, and the melting point of some lead - free solders is around 210 - 230 °C), the metal atoms in the solder obtain sufficient energy to become active, and the lattice structure gradually becomes unstable. Decomposition of organic flux: The organic flux used in the welding process mainly functions to remove oxides on the welding surface, reduce the surface tension of the solder, and promote the welding process. However, at high temperatures (above 90 °C), the organic flux will undergo a decomposition reaction. The organic components in the flux will volatilize and carbonize, generating some gases and small - molecule substances. These substances escape from the welding area, resulting in voids in the originally tight welding interface. For example, common rosin - based fluxes will decompose at high temperatures to produce gases such as carbon dioxide and water vapor. These gases will form bubbles in the solder, and as the bubbles increase and grow, they will destroy the tight bonding between the solder and the battery cell electrode. The solder ribbon, battery cells, and other encapsulation materials in a photovoltaic module have different coefficients of thermal expansion. When the temperature rapidly rises above 90 °C, they will undergo different degrees of thermal expansion. This thermal expansion difference will generate a large thermal stress at the welding interface. When the thermal stress exceeds the bonding strength of the welding material, it will cause the connection between the solder and the battery cell electrode to become loose, or even cause the solder to detach from the electrode surface. How to solve this problem has currently attracted more and more attention. Summary of the Invention

[0004] Object of the Invention: Aiming at the problems and deficiencies in the prior art, according to the present invention, a manufacturing method of a photovoltaic solder ribbon, a photovoltaic solder ribbon, and a photovoltaic module are provided, which can effectively improve the performance and reliability of the photovoltaic module.

[0005] Specifically as follows:

[0006] A manufacturing method of a photovoltaic solder ribbon, the manufacturing method of the photovoltaic solder ribbon includes:

[0007] At room temperature, a special material is coated on the surface of the solder strip body to obtain a photovoltaic solder strip; the special material includes: low-melting-point glass powder, special wax material, and silicone compound.

[0008] Further, the special wax material includes any one of the following: microcrystalline wax, polyethylene wax.

[0009] Further, the silicone compound includes any one of the following: polydimethylsiloxane, methylphenylsiloxane.

[0010] On the other hand, the present invention also provides a photovoltaic solder strip, which is used to connect between photovoltaic cells. The photovoltaic solder strip is characterized in that it is obtained by the manufacturing method of the above-mentioned photovoltaic solder strip.

[0011] On the other hand, the present invention also provides a photovoltaic module, including: a plurality of photovoltaic cells and a plurality of photovoltaic solder strips. The photovoltaic solder strips are welded and connected between the photovoltaic cells, and the photovoltaic solder strips are the above-mentioned photovoltaic solder strips.

[0012] Further, when the local area of the photovoltaic module is heated to M degrees Celsius due to a short circuit, the special material on the surface of the photovoltaic solder strip in the local area will automatically form an isolation layer to isolate the solder strip body and the grid line.

[0013] The grid line is located on the surface of the photovoltaic module.

[0014] Further, M is greater than or equal to 90.

[0015] Beneficial effects:

[0016] Photovoltaic modules often encounter such problems: when the temperature of the local area of the photovoltaic module connected in series by the photovoltaic solder strip rises above 90 degrees Celsius due to a short circuit, the welding state is damaged through mechanisms such as physical changes of the solder, decomposition of the soldering flux, and thermal stress, and at the same time, secretion substances are generated from the solder and packaging materials. The leakage of these substances further exacerbates the trend of the solder strip to break away from the welding state, seriously affecting the performance and reliability of the photovoltaic module.

[0017] The present invention can effectively improve the performance and reliability of the photovoltaic module. When there is a short circuit, it can quickly isolate the solder strip body and the grid line, improving safety. Specific embodiments

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments.

[0019] This embodiment provides a manufacturing method of a photovoltaic solder strip. The manufacturing method of the photovoltaic solder strip includes:

[0020] At room temperature, a special material is coated on the surface of the solder strip body to obtain a photovoltaic solder strip; the special material includes: low-melting glass powder, special wax material, and silicone compound.

[0021] The low-melting glass powder includes but is not limited to: borate glass powder, sodium-potassium glass powder, aluminosilicate glass powder, fluoride glass powder.

[0022] Further, the special wax material includes any one of the following: microcrystalline wax, polyethylene wax.

[0023] Further, the silicone compound includes any one of the following: polydimethylsiloxane, methylphenylsiloxane.

[0024] On the other hand, the present invention also provides a photovoltaic solder strip, which is used to connect between photovoltaic cells. The photovoltaic solder strip is characterized in that it is prepared by the above method for manufacturing a photovoltaic solder strip.

[0025] On the other hand, the present invention also provides a photovoltaic module, including: a plurality of photovoltaic cells and a plurality of photovoltaic solder strips. The photovoltaic solder strips are welded and connected between the photovoltaic cells, and the photovoltaic solder strips are the above-mentioned photovoltaic solder strips.

[0026] Further, when the local area of the photovoltaic module is heated to M degrees Celsius due to a short circuit, the special material on the surface of the photovoltaic solder strip in the local area will automatically form an isolation layer to isolate the solder strip body and the grid line.

[0027] Further, the M is greater than or equal to 90.

[0028] Beneficial effects:

[0029] Photovoltaic modules often encounter such problems: when the temperature of the local area of the photovoltaic module connected in series by the photovoltaic solder strip rises above 90 degrees Celsius due to a short circuit, the welding state is damaged through mechanisms such as physical changes of the solder, decomposition of the flux, and thermal stress, and at the same time, secretion substances are generated from the solder and the packaging material. The exudation of these substances further exacerbates the trend of the solder strip breaking away from the welding state, seriously affecting the performance and reliability of the photovoltaic module.

[0030] The present invention can effectively improve the performance and reliability of the photovoltaic module, quickly isolate the solder strip body and the grid line during a short circuit, and improve safety.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for manufacturing a photovoltaic welding ribbon, characterized in that: The method for manufacturing the photovoltaic welding ribbon comprises: At room temperature, special materials are coated on the surface of the welding ribbon body to obtain a photovoltaic welding ribbon; the special materials include: low-melting-point glass powder, special wax material, and organic silicon compound.

2. The method for manufacturing a photovoltaic welding ribbon according to claim 1, characterized in that: Special wax materials include any of the following: microcrystalline wax, polyethylene wax.

3. The method for manufacturing a photovoltaic welding ribbon according to claim 1, characterized in that: The organic silicon compound includes any one of the following: polydimethylsiloxane and methylphenylsiloxane.

4. The method for manufacturing a photovoltaic welding ribbon according to claim 1, characterized in that: The low melting point glass powder includes: borate glass powder, sodium potassium glass powder, aluminosilicate glass powder, and fluoride glass powder.

5. A photovoltaic welding ribbon, which is used to connect between photovoltaic cells, characterized in that: The photovoltaic welding strip is manufactured by the method for manufacturing the photovoltaic welding strip according to any one of claims 1 to 4.

6. A photovoltaic module, characterized in that: include: A plurality of photovoltaic cells and a plurality of photovoltaic welding strips, wherein the photovoltaic welding strips are welded and connected between the photovoltaic cells, and the photovoltaic welding strips are the photovoltaic welding strips according to claim 5.

7. The photovoltaic ribbon photovoltaic module according to claim 6, characterized in that: When a short circuit occurs in the photovoltaic module and causes the temperature of a local area to rise to M degrees Celsius, the special material on the surface of the photovoltaic welding strip in the local area will automatically form an isolation layer to isolate the welding strip body and the grid line.

8. The photovoltaic ribbon photovoltaic module according to claim 7, characterized in that: The M is greater than or equal to 90.