Tin, lead and indium-based solder alloy for photovoltaic solder strip and preparation method thereof

Abstract

The invention discloses a tin, lead and indium-based solder alloy for a photovoltaic solder strip. The tin, lead and indium-based solder alloy is prepared from the following components in percent by mass: 58-63% of Sn, 33-40% of Pb, 1-3% of In and 0.1-1% of Ga, totaling 100%. The alloy has a relatively low melting point. A preparation method comprises the following steps: S1, weighing tin particles, lead particles, indium particles and gallium particles the purities of which are 99.99% separately, and meeting the following condition that the components in the alloy comprise, in percent by mass, 58-63% of Sn, 33-40% of Pb, 1-3% of In and 0.1-1% of Ga; S2, ultrasonically cleaning the raw materials weighed in the S1; S3, smelting the ultrasonically cleaned raw materials in the S2; and S4, casting the tin-lead-indium-gallium alloy prepared in the S3 into alloy ingots. The method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous alloys and photovoltaic ribbons, and in particular relates to a tin-lead-indium-based solder alloy for photovoltaic ribbons; the invention also relates to a preparation method of the tin-lead-indium-based solder alloy for photovoltaic ribbons. Background technique [0002] With the prosperity and development of modern industry, the energy consumption of fossil fuels such as traditional coal, oil, and natural gas is increasing day by day, resulting in a sharp decline in the reserves of fossil fuels in the earth's crust, and the world's energy crisis has become increasingly prominent. The research and development of new clean energy is imminent, such as solar energy, wind energy, water energy, nuclear energy and so on. Compared with water energy, wind energy, nuclear energy, etc., solar energy has no emission and noise when it is converted into other energy (mainly electric energy), so solar ene...

AI Technical Summary

Problems solved by technology

The coating of the photovoltaic ribbon is to realize the connection with the battery silicon (monocrystalline silicon, polycrystalline silicon, amorphous silicon), because the battery piece will undergo instantaneous cooling after brazing, so a large shrinkage deformation will occur during the cooling process , and the thermal expansion coefficient mismatch between the silicon material, the silver paste and the ribbon will cause a large stress between the ribbon and the cell, which will have a greater impact on the strength of the cell

After welding, due to the action of this force, the bow of the battery sheet will be caused, and this bow is likely to develop into cracks or fragments during the subsequent laying, lamination and use; During the interconnection process of the sheet connection, the temperature change of the material is not uniform, and there will be a large temperature difference in the welding area, which will also lead to obvious local stress concentration of the battery sheet, and eventually lead to the battery sheet breaking during the welding process