BC Solar Stringer Machine for High-Efficiency Modules

As back contact (BC) cell technology pushes photovoltaic efficiency to higher limits, the interconnection process becomes significantly more demanding. Unlike conventional cells, BC cells relocate all electrodes to the rear side, leaving almost no margin for alignment error. In this context, a BC solar stringer machine must handle extremely tight spacing while preventing short circuits and thermal damage during soldering.

The CTM-60BC is developed specifically to address these challenges. By integrating a high-precision CCD vision system, this BC solar stringer machine achieves alignment accuracy at the micron level. Using advanced detection methods, it can identify defects such as misalignment, cracks, and contamination before welding, ensuring that each cell is positioned correctly and reducing the risk of electrical failure during interconnection.

Stable Welding for Ultra-Thin Cells

With the increasing adoption of ultra-thin wafers, controlling thermal stress has become a critical factor in maintaining cell integrity. The CTM-60BC BC solar stringer machine utilizes an infrared welding process that distributes heat more evenly compared to traditional methods, reducing localized stress on the silicon wafer.

This approach allows the BC solar stringer machine to handle cells as thin as 110 μm while maintaining a low breakage rate. By combining precise flux application with controlled heating, the system minimizes microcracks and ensures stable solder joints, which is essential for long-term module reliability.

High-Speed Automation and Throughput

In addition to precision and stability, production efficiency is another key requirement. The CTM-60BC BC solar stringer machine integrates multi-axis servo systems, linear motors, and robotic handling to achieve fully automated operation from cell loading to string output.

This advanced automation enables the BC solar stringer machine to reach a throughput of over 6000 pieces per hour while maintaining high process consistency. At the same time, it supports a wide range of cell sizes and busbar configurations, making it adaptable to evolving BC cell designs. Even under continuous operation, the system maintains high utilization rates and low defect levels, supporting large-scale manufacturing.

Conclusion

The BC solar stringer machine plays a central role in enabling the mass production of high-efficiency BC modules. By combining precision alignment, controlled thermal processing, and high-speed automation, the CTM-60BC provides a reliable solution for overcoming the challenges of BC cell interconnection.

As the photovoltaic industry continues to move toward higher efficiency and thinner cell structures, the importance of advanced BC solar stringer machine technology will only continue to grow.