Preparation method and coating process of photovoltaic welding strip pre-coated welding flux

Abstract

The invention relates to a photovoltaic solder strip precoating flux. The precoating flux is prepared from the following raw materials in percentage by weight: 0.25-1% of a surfactant, 0.25-10% of a film-forming agent and 89-100% of a solvent. The pre-coating welding flux is coated on a welding strip, so that the welding strip can be directly brazed with a solar cell in an assembly factory, the welding flux does not need to be coated, and the pre-coating welding flux is convenient and rapid; and welding and spraying to other positions can be avoided, waste is avoided, the shutdown frequency of the welding machine is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a method for preparing a pre-coated flux for a photovoltaic welding strip and a coating process thereof. Background Art

[0002] Solar energy is a clean and renewable energy source. Photovoltaic welding tape, also known as tin-coated welding tape, is made by coating a layer of one-element, two-element or three-element low-melting-point alloy on the surface of a copper tape of set specifications. The tin-coated welding tape is then sold directly as a product. After the buyer buys the welding tape, he needs to apply another layer of flux to solder the welding tape to the solar cell sheet, so as to connect it into a photovoltaic module for use.

[0003] In the subsequent use process, due to the need to apply flux, product quality abnormalities are likely to occur during the production process. The welding nozzle may be clogged, resulting in cold soldering and desoldering. The flux spraying range exceeds the margin, resulting in battery cell contamination. The welding machine equipment needs to be shut down and cleaned regularly, affecting production efficiency. Summary of the invention

[0004] In view of the above problems, the present invention provides a method for preparing pre-coated flux for photovoltaic welding strips and its coating process, wherein the flux is directly coated on the surface of the welding strip. When the flux is applied in the component factory, there is no need to apply the flux again, and the welding can be directly performed with the solar cell.

[0005] The technical solution adopted in the present invention is: A photovoltaic welding ribbon pre-coating flux, the pre-coating flux is made of the following raw materials in percentage by weight: Surfactant 0.25-1%, Film former 0.25-10%, Solvent 89-100%.

[0006] As a further improvement of the above technical solution, the surfactant is fatty acid glyceride.

[0007] As a further improvement of the above technical solution, the film-forming agent is polyethylene glycol.

[0008] As a further improvement of the above technical solution, the solvent is one or a mixture of ethanol and isopropanol.

[0009] A method for preparing a pre-coated flux for a photovoltaic welding strip comprises the following steps: 0.25-1% of a surfactant, 0.25-10% of a film former, and 89-100% of a solvent are mixed and stirred, and the pre-coated flux is obtained after standing.

[0010] A method for coating a photovoltaic welding ribbon with a pre-coated flux, the coating method comprising the following steps: The first step is to tin the solder strip, cool it, and then apply the pre-coated flux on the surface of the cooled solder strip to obtain the pre-coated flux solder strip; The second step is to dry the pre-fluxed solder strip under a heat source at 50 degrees Celsius to 120 degrees Celsius.

[0011] The advantages of the present invention are: By coating the pre-coated flux of the present invention on the welding strip, the welding strip can be directly brazed with the solar cell sheet in the assembly factory without applying flux, which is convenient and quick; it can avoid welding spraying to other positions, avoid waste, reduce the number of shutdowns of the welding machine, and improve production efficiency. DETAILED DESCRIPTION

[0012] The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0013] A photovoltaic welding ribbon pre-coating flux, the pre-coating flux is made of the following raw materials in percentage by weight: Surfactant 0.25%, Film former 0.25%, Solvent 99.5%.

[0014] As a further improvement of the above technical solution, the surfactant is fatty acid glyceride.

[0015] As a further improvement of the above technical solution, the film-forming agent is polyethylene glycol.

[0016] As a further improvement of the above technical solution, the solvent is one or a mixture of ethanol and isopropanol.

[0017] A method for preparing a pre-coated flux for a photovoltaic welding strip comprises the following steps: 0.25% of a surfactant, 0.25% of a film-forming agent, and 99.5% of a solvent are mixed and stirred, and the pre-coated flux is obtained after standing.

[0018] A method for coating a photovoltaic welding ribbon with a pre-coated flux, the coating method comprising the following steps: The first step is to tin the solder strip, cool it, and then apply the pre-coated flux on the surface of the cooled solder strip to obtain the pre-coated flux solder strip; The second step is to dry the pre-fluxed solder strip at 50 degrees Celsius under a heat source. Example

[0019] A photovoltaic welding ribbon pre-coating flux, the pre-coating flux is made of the following raw materials in percentage by weight: Surfactant 1%, Film former 10%, Solvent 89%.

[0020] As a further improvement of the above technical solution, the surfactant is fatty acid glyceride.

[0021] As a further improvement of the above technical solution, the film-forming agent is polyethylene glycol.

[0022] As a further improvement of the above technical solution, the solvent is one or a mixture of ethanol and isopropanol.

[0023] A method for preparing a pre-coated flux for a photovoltaic welding strip comprises the following steps: 1% of a surfactant, 10% of a film-forming agent and 89% of a solvent are mixed and stirred, and the pre-coated flux is obtained after standing.

[0024] A method for coating a photovoltaic welding ribbon with a pre-coated flux, the coating method comprising the following steps: The first step is to tin the solder strip, cool it, and then apply the pre-coated flux on the surface of the cooled solder strip to obtain the pre-coated flux solder strip; The second step is to dry the pre-fluxed solder strip at 120 degrees Celsius under a heat source.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic ribbon pre-coated flux, characterized in that: The pre-coated flux is made of the following raw materials in percentage by weight: Surfactant 0.25-1%, Film former 0.25-10%, Solvent 89-100%.

2. A photovoltaic welding ribbon pre-coated flux according to claim 1, characterized in that: The surfactant is fatty acid glyceride.

3. A photovoltaic welding ribbon pre-coated flux according to claim 1, characterized in that: The film-forming agent is polyethylene glycol.

4. A photovoltaic welding ribbon pre-coated flux according to claim 1, characterized in that: The solvent is one or a mixture of ethanol and isopropanol.

5. A method for preparing the photovoltaic welding ribbon pre-coated flux according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: 0.25-1% of a surfactant, 0.25-10% of a film former and 89-100% of a solvent are mixed and stirred, and the pre-coated flux is obtained after standing.

6. A method for coating a photovoltaic welding ribbon pre-coated flux as claimed in any one of claims 1 to 5, characterized in that: The coating method comprises the following steps: The first step is to tin the solder strip, cool it, and then apply the pre-coated flux on the surface of the cooled solder strip to obtain the pre-coated flux solder strip; The second step is to dry the pre-fluxed solder strip under a heat source at 50 degrees Celsius to 120 degrees Celsius.