Driven by the trend of high efficiency, lightweight design and cost reduction in the photovoltaic industry, N-type TOPCon and HJT high-efficiency cell technologies have gained widespread popularity, and Super Multi-Busbar (SMBB) modules have become the mainstream of the market. As the core interconnection auxiliary material for PV modules, traditional single welding ribbons can no longer meet the production requirements of high-precision and high-power modules. Industry pain points such as cell micro-cracks, high shading rate and uneven conductivity continue to restrict the performance upgrading of PV modules. Against this backdrop, bundled welding ribbons, featuring innovative structure and optimized processes, have emerged as an upgraded high-quality solution for PV auxiliary materials, strongly supporting the power improvement and quality optimization of photovoltaic modules.
Compared with conventional flat ribbons and single thin ribbons, bundled welding ribbons adopt a precisely integrated structure with multiple ultra-fine ribbons and optimized layout technology, thoroughly solving common industrial problems of traditional ribbons such as easy deviation, cold solder joints and poor alignment accuracy during high-speed soldering. The integrated and standardized bundled structure greatly improves soldering stability and consistency, perfectly adapts to fully automatic high-speed stringer equipment, effectively reduces the defective rate in module production, and helps manufacturers achieve quality improvement and efficiency growth at the production end.
Bundled welding ribbons deliver prominent advantages in core performance. On the one hand, the optimized cross-sectional structure and surface coating process significantly reduce soldering stress, fundamentally eliminating micro-cracks and fragmentation of ultra-thin cells during welding, and greatly improving the production yield and long-term operational reliability of PV modules. On the other hand, the unique bundled layout effectively reduces the shading area of welding ribbons and enhances the light absorption utilization rate of solar cells. Equipped with high-conductivity alloy coatings, the product optimizes the current collection path and significantly reduces series resistance loss, effectively increasing the power output of modules under the same specifications and boosting the power generation revenue of terminal PV systems.
Tailored for the low-temperature soldering process characteristics of mainstream N-type high-efficiency cells, the newly upgraded bundled welding ribbons have realized material and process adaptation. Adopting low-melting-point and high-wettability environmentally friendly tin alloy coatings, the products are compatible with low-temperature non-destructive soldering processes. They effectively protect the thin-film structure of N-type cells, avoid cell performance attenuation caused by high-temperature soldering, and fully release the power generation potential of N-type high-efficiency cells. In addition, the products have passed stringent reliability tests including double 85 damp heat aging, thermal cycling and mechanical tensile tests. With excellent corrosion resistance, aging resistance and high tensile strength, they adapt to complex outdoor operation environments and ensure stable power generation of PV modules for more than 25 years.
Currently, competition in the photovoltaic industry has extended from the technical competition of cells and modules to the refined supporting capacity of auxiliary materials. The application of bundled welding ribbons fills the supporting gap of auxiliary materials for high-efficiency SMBB modules. Mass production can be quickly realized without large-scale transformation of existing production equipment, taking into account the three core demands of cost reduction, quality improvement and efficiency enhancement.
Industry insiders state that with the continuous increase of module power and the wide application of ultra-thin solar cells, high-precision, low-stress and highly adaptable customized auxiliary materials will become rigid industry requirements. In the future, PV auxiliary material enterprises will continue to deepen the technical iteration of bundled welding ribbons, optimize product structures, coating processes and customized service capabilities, and develop more efficient and reliable PV interconnection solutions. These efforts will help the photovoltaic industry continuously reduce costs and improve efficiency, accelerating the large-scale popularization of clean energy worldwide.
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