The Multi Busbar Connector connects solar cells to strings with 12 round wires and 20 soldering pads per wire at high-speed. The aesthetic cell design turns modules into a premium product with 6W to 9W more power output. Short and narrow grid fingers result in a high fill factor and a high current at lower costs; up to 25% silver can be saved when screenprinting the cells. Moreover, light hitting the round copper wires is reflected back onto the cell. This efficient light recycling contributes to the minimized cell-to-module (CTM) loss. Modules with 60 cells show a CTM loss of less than 4.5% when using SCHMID’s reliable multi busbar connection solution. The solar cells are processed “sunny side up”. The wires with a core diameter of 360 µm and a 15 µm SnPbAg coating are covered with flux inside the machine. The front-to-back soldering of the wires to the cells is performed on a preheated chuck. The wires are held by special parallel grippers. A motion axis system together with a high precision imaging system ensures exact cell placement with an accuracy of 0.05mm. Thus, a precise overlap of the small wires and the metallization pattern of the cells is guaranteed, even with minimum solder pad sizes. Existing module production lines are easily upgraded; the Multi Busbar Connector harmonizes with subsequent lamination processes and uses contact-free infrared soldering technology which is compatible with all cell designs.
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