Photovoltaic solder strip and preparation method therefor

Abstract

The invention discloses a photovoltaic solder strip and a preparation method therefor. The photovoltaic solder strip comprises a base material and a tin lead alloy solder coated on the base material;and the tin lead alloy solder comprises 0.05-0.5% of copper, 0.1-1% of silver and 0.01-0.05% of phosphorus. By virtue of the copper, silver and phosphorus elements added to the tin lead alloy solder,the oxidization resistance, the wettability and release force intensity of the photovoltaic solder strip can be improved; meanwhile, the resistivity of the photovoltaic solder strip is lowered by 9.8%, equivalently, the power of a photovoltaic assembly is improved by about 0.8W, so that loss of photoelectric conversion efficiency caused by loss of resistance power can be lowered; the copper, silver and phosphorus elements have relatively high intermiscibility, so that corrosion of a tin liquid to the added copper and silver elements can be suppressed, and a phenomenon of insufficient solder ofthe battery piece can be avoided; the surface layer of the photovoltaic solder strip is rich in phosphorus-tin alloy, so that an effect of lowering the partial temperature of a soldering point in battery piece soldering also can be played, thereby facilitating soldering; and in addition, the photovoltaic solder strip has simple preparation method, low cost, easy operation and implementation, no environmental pollution, and convenience in realizing industrial production and application.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic welding ribbon and its processing, in particular to a photovoltaic welding ribbon and a preparation method thereof. Background technique [0002] Photovoltaic ribbon is an important raw material in the welding process of photovoltaic modules. The quality of the ribbon will directly affect the current collection efficiency of photovoltaic modules and greatly affect the power of photovoltaic modules. At present, conventional photovoltaic modules use interconnection strips to connect different cells in series, and achieve the purpose of module power output through busbars. The ribbon connects the cells in series, one end of the ribbon is welded to the front of the battery, the other end is welded to the back of the other battery, and packaged into the photovoltaic module. Sunlight enters the battery from the front of the battery, and the ribbon on the front will block a part of the silico...

AI Technical Summary

Problems solved by technology

For example, holes are opened on the surface of the welding strip to reduce the shading area and the usage of the welding strip, but the production process of the welding strip needs to be increased, and the position of the opening is very particular. On the one hand, the mechanical properties of the welding strip cannot be reduced, and on the other hand On the one hand, it brings inconvenience to the subsequent processing procedures, and it is necessary to bypass the hole position to complete the welding, which is a big challenge for stringer welding