Solder strip for laminated photovoltaic module and laminated photovoltaic module

Abstract

The invention discloses a solder strip for a laminated photovoltaic module, which is prepared by locally stamping a circular copper wire to form a thin, long and flat middle section and a transition section with gradually-changed thicknesses, then integrally annealing, and coating the surface with a tin-lead alloy. The invention further discloses a laminated photovoltaic module with the solder strip. Through the structural optimization and annealing treatment of the solder strip, the overall yield strength of the solder strip is reduced, and the stress impact after the solder strip is in contact with a battery piece can be reduced. The solder strip and the battery piece are connected through an adhesive, and the adhesive is cured by several times; the manufactured laminated photovoltaic module can avoid hard contact of a battery piece, a solder strip and a battery piece in an overlapping region; the thickness of the adhesive is gradually increased, especially the stress impact in the laminating process can be resisted in the overlapping area, the process fragmentation risk is reduced, the production yield of the laminated photovoltaic module is improved, the subfissure risk of thepackaged module under the action of external stress is greatly reduced, and the reliability of the module is greatly improved.

Description

technical field [0001] The invention relates to a welding ribbon and a photovoltaic module thereof, in particular to a welding ribbon for a laminated photovoltaic module and a laminated photovoltaic module. Background technique [0002] At present, the high cost of electricity is still the main factor restricting photovoltaics from occupying the mainstream energy market. Only by reducing costs and increasing efficiency can we break through the existing bottleneck. At present, the efficiency improvement methods for mass production include technologies such as half-cell, double-sided, and multi-busbar, which lead to a substantial increase in the single power of photovoltaic modules, but the module efficiency is low. [0003] In order to further reduce costs and increase efficiency, stitch welding technology has become a new direction for the development of the industry, which can further improve the efficiency of components. At present, the conventional stitch welding technolo...

AI Technical Summary

Problems solved by technology

Although the hardness of the tin-coated copper strip is extremely soft, the overall thickness is ultra-thin due to the overall pulling up, which can cause a significant increase in the resistance of the solder strip, and at the same time, the width also increases significantly, resulting in an increase in the battery shielding area. On the other hand, the flat solder strip light Low reflectivity, these factors lead to a significant reduction in the unit power output of the module, a substantial increase in the cost per watt of the module, and a significant reduction in the competitiveness of the product

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