New Product: teamtechnik boosts stringer system uptime and reduces footprint

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Product Briefing Outline: teamtechnik has specialized on high-throughput stringer machines for the global photovoltaic industry. These high-performance production tools are designed to combine reliable large-scale series production with unexcelled levels of string quality. The standard stringers TT 900 and TT 1200 operate at respective rates of 900 and 1200 cycles per hour. The two units are the offspring of a singular modular construction system. Thus two TT 1200 stringers will operate at 2400 cycles per hour in a 50MW system.

Problem: Module assembly is one the most expensive steps in c-Si cell/module production. Fully automated and integrated tabber/stringer systems need to have high throughput and high yield to support PV manufacturers cost reduction strategies.

Solution: All TT stringers feature contactless, controlled soldering technology. teamtechnik specializes in soldering techniques that rely on infrared light or laser. Both techniques are available for optional integration in every teamtechnik stringer. The laser technology serves as a valuable source of enhanced flexibility for dealing with different materials; it ensures optimal results when soldering an extensive array of cell, ribbon and flux combinations. As production proceeds, the controlled process technology compensates for variations in cell material to minimize breakage while ensuring consistent string quality, time after time. Each of the heating zones in the TT stringer can be adjusted individually. By allowing operators to precision-tune temperatures in each zone, this feature makes it possible to specify the ideal thermal conditions for each cell type prior to, during and after the soldering process. A distinctive asset for users who process different cell types on a single production assembly. A special hold-down device featuring the functionality of a positioning tool guarantees that ribbons are precisely positioned on the cells. The resulting strings offer convincing geometrical quality by combining improved alignment, linearity, length and cell intervals with excellent cell and ribbon positioning.

Applications: Standard and back contact cells (BC / EFG / film). Wafer thickness > 160 µm with 2 and 3 bus bars.

Platform: teamtechnik stringers transport the cells “sunny side down” – a concept to keep cell-handling to an absolute minimum. This same “sunny side down” principle makes it possible to process BC cells on a single production machine. The systems are designed as a flexible modular system and can be equipped with a wide range of soldering technology:

Availability: Currently available.

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