Manufacturing method of photovoltaic welding strip and tin coating machine thereof

Abstract

The invention provides a manufacturing method of a photovoltaic welding strip and a tin coating machine thereof. The method comprises the following steps: A, carrying out a simple pretreatment on a copper strip; B, sending the pretreated copper strip into a plating solution of a tin furnace for tin coating, when tin coating, carrying out an ultrasonication to the copper strip with ultrasonic waveemitted by an ultrasonic wave transducer arranged above the tin furnace; C, blowing tin with inert gases, and D, receiving materials. According to the invention, by adding ultrasonic wave in the tin coating process, tin liquor can rapidly form an alloy layer of copper and tin on the surface of the copper strip by the sound pressure effect of the ultrasonic wave, the production efficiency of the photovoltaic welding strip is increased, the transporting speed of the copper strip reaches to 10-80m / min; by removing grease and oxide layer on the copper strip surface, reducing the usage of chemicalreagents, simplifying the pretreatment before coating, and utilizing the ultrasonic wave to crush clusters of tin oxide, the defects of pinhole and tin slag of the welding strip is prevented, the quality of the welding strip is improved, and the production efficiency is raised greatly.

Description

technical field [0001] The invention relates to a method for manufacturing a welding strip, in particular to a method for manufacturing a tin-coated welding strip used for connecting and conducting solar photovoltaic modules, and belongs to the technical field of photovoltaic welding strip processing methods. Background technique [0002] With the development of society, the photovoltaic industry based on solar energy has developed rapidly at home and abroad in recent years. Photovoltaic ribbon is a key component in solar photovoltaic modules in the photovoltaic industry. It is crucial to the energy efficiency and service life of solar photovoltaic modules. Therefore, the quality and performance of photovoltaic ribbons are very high. [0003] Chinese patent literature discloses a manufacturing method of photovoltaic ribbon, the patent name is "a method of manufacturing ultra-soft photovoltaic ribbon", the patent number is "200910181579.5", the manufacturing method includes t...

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Problems solved by technology

[0003] Chinese patent literature discloses a manufacturing method of photovoltaic ribbon, the patent name is "a method of manufacturing ultra-soft photovoltaic ribbon", the patent number is "200910181579.5", the manufacturing method includes the following steps: 1. The copper wire is fine-rolled and annealed in a continuous tube; 2. Ultrasonic cleaning is performed on the annealed oxygen-free copper wire with clean water; 3. The cleaned copper strip is soaked with flux, and then enters a tin furnace to coat tin; 4. An automatic adjustment induced draft fan is installed at the exit of the tin furnace. After the tin-coated copper strip comes out of the tin furnace, it first passes through the induced draft fan, and then goes through the automatic drawing machine and the automatic winding machine to complete the finished ribbon. The processing technology of the photovoltaic ribbon exists There are three disadvantages: 1. Strict requirements for pre-plating treatment. It needs to go through a series of surface pretreatments such as degreasing and decontamination, removing the oxide layer on the surface of the copper strip, cleaning, drying, and applying flux, otherwise pinhole defects will easily occur. That is, partial missing plating; 2. To ensure the formation of the copper-tin alloy layer, the time of the copper strip in the molten metal should not be too short. In order to control the thickness of the tin layer, the speed of the tape should not be too fast. Generally, the speed of the tape should not exceed 8m / min, otherwise the tin liquid brought out by the copper strip will increase, resulting in an ultra-thick coating, so the production efficiency will be low; 3. During the continuous tin coating process, the surface of the molten tin liquid will oxidize with the oxygen in the air to form tin oxide, Tin oxide continuously penetrates into the tin liquid, and the accumulated tin oxide in the tin liquid will form tin clusters, which will adhere to the copper strip to form tin slag, and silicon wafers will easily break during welding.

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