What are the advantages of photovoltaic welding strip rolling mill compared to ordinary rolling mill

       The core advantage of photovoltaic welding strip rolling mill is designed to meet the special requirements of "high precision, narrow specifications, high conductivity and thermal conductivity" of photovoltaic welding strips. Compared with ordinary rolling mills, it is more suitable for the photovoltaic industry scene in terms of processing accuracy, material adaptation, efficiency stability, etc. The specific advantages are as follows:

1、 More stringent processing accuracy, matching the core requirements of the welding strip

       The thickness tolerance control is more precise and can reach a stable level of ± 0.001mm, far superior to the ± 0.01mm level of ordinary rolling mills. It can meet the ultra-thin processing requirements of photovoltaic welding strips (usually with a thickness of 0.08-0.2mm) and avoid the impact of uneven thickness on the conductivity of battery cell welding.

       The width control accuracy is higher, and a dedicated rolling mill is designed for narrow welding strips (commonly 1.2-6mm in width), with no burrs or warping on the edges. Ordinary rolling mills are prone to edge tearing and large width deviations when processing narrow materials.

       The surface quality is better, and the rolling mill adopts high-precision polishing treatment. The surface roughness Ra of the welded strip after processing is ≤ 0.1 μ m, without scratches or indentations, ensuring the adhesion with the battery cell during welding and reducing the risk of virtual welding. Ordinary rolling mills are difficult to balance the surface flatness of narrow materials.

2、 Stronger material adaptability and protection of key performance of solder strips

      Optimize the roller material and rolling process for commonly used alloy materials such as tin plated copper and silver plated copper in photovoltaic welding strips to avoid coating peeling and material oxidation. The universal rollers of ordinary rolling mills are prone to wear of coatings or deformation of material grains, which affects conductivity and thermal conductivity.

      Low temperature rolling can be achieved to reduce the impact of high temperature on the performance of copper substrate and ensure the conductivity of the welding strip (usually requiring ≥ 98% IACS). The high rolling temperature of ordinary rolling mills may lead to an increase in material hardness and a decrease in conductivity.

3、 Better efficiency and stability, suitable for large-scale production

      The integrated design of continuous rolling and online straightening is adopted, and the speed of a single production line can reach 30-50m/min, and it can operate continuously for 24 hours. Ordinary rolling mills require frequent adjustments for narrow materials, and the production efficiency is only one-third to one-half of it.

      Equipped with an intelligent closed-loop control system, real-time monitoring of thickness, width, and surface quality, automatic adjustment of rolling parameters, and a scrap rate that can be controlled below 0.5%. Ordinary rolling mills rely on manual adjustment, and the scrap rate is usually above 3%.

      The service life of the rolling mill is longer, and the dedicated wear-resistant rolling mill can continuously process materials of more than 500 tons. The rolling mill rolls of ordinary rolling mills wear out quickly when processing narrow materials, and the replacement frequency is 2-3 times that of photovoltaic welding strip rolling mills.

4、 Customized design to meet the diverse needs of welding strips

      Flexible switching between different specifications of molds, suitable for welding strip production with a width of 1.2-12mm and a thickness of 0.05-0.3mm, without the need for large-scale equipment modification. When replacing narrow specifications with ordinary rolling mills, it is necessary to re adjust the roll gap and tension, which takes a long time.

      Some high-end models integrate online cleaning and drying functions, reducing subsequent processing steps. Ordinary rolling mills require additional cleaning equipment, increasing production processes and costs.