What are the applications of photovoltaic welding strip rolling mill in the photovoltaic industry

      The Photovoltaic Welding Strip Rolling Mill is the core equipment for photovoltaic ribbon production, mainly serving the manufacturing process of photovoltaic ribbon in the photovoltaic industry, and indirectly supporting the production of photovoltaic modules through photovoltaic ribbon. The specific applications are as follows:

1. Rolling production of photovoltaic welding strips

      The raw material for photovoltaic solder strips (also known as tin coated strips) is usually high-purity copper strips (such as oxygen free copper wires), which need to be rolled and processed to form flat strips of specific specifications. The core function of the photovoltaic welding strip rolling mill is to roll circular or coarse copper materials into flat copper strips with uniform thickness and precise width, providing a basic blank for subsequent processes such as tin plating and slitting.

      During the rolling process, the rolling mill can produce flat copper strips with different thicknesses (such as 0.08-0.3mm) and widths (such as 1.5-6mm) by adjusting the roll parameters, to match different sizes of photovoltaic cells (such as 156mm, 182mm, 210mm for conventional components) and welding requirements.

The accuracy of the rolling mill directly affects the dimensional consistency and surface flatness of the welding strip, which are key to ensuring the welding quality of photovoltaic cells (such as avoiding virtual welding and fracture) and the conductivity efficiency of components.

2. Adapt to the production needs of different types of photovoltaic solder strips

      In the photovoltaic industry, photovoltaic welding strips are divided into various types according to their application scenarios, and the photovoltaic welding strip rolling mill needs to adapt to these types of production:

      Conventional welding strip: used for series connection of solar cells in ordinary photovoltaic modules. The rolling mill needs to roll flat strips with uniform width and thickness to meet the stability of batch welding.

      Busbar: As the "main line" for collecting internal current in photovoltaic modules, it usually requires wider and thicker specifications (such as 10-15mm width). The rolling mill can produce corresponding sized billets by adjusting the rolling parameters.

      Irregular welding strips (such as triangular welding strips and semi-circular welding strips): In order to improve component power, some high-end components use irregular welding strips. The rolling mill can customize the shape of the rolling mill to roll non flat special section billets, laying the foundation for subsequent irregular processing.

3. Support efficient manufacturing of photovoltaic modules

      Photovoltaic ribbon is the "conductive bridge" of photovoltaic modules, and its quality directly affects the power generation efficiency and reliability of the modules. The photovoltaic welding strip rolling mill indirectly guarantees:

      Reliable connection of battery cells: The rolled welding strip has precise dimensions and can tightly adhere to the main or fine grid lines of the battery cells, reducing contact resistance and power loss.

      Durability of components: A flat surface and uniform mechanical properties can prevent the welding strip from breaking due to thermal expansion and contraction during long-term use of the component, thereby improving the service life of the component (usually requiring more than 25 years).