Coherent | E-Mobility Battery Production: Busbar Tab Welding, Welding of Dissimilar Materials

Battery system manufacturers require cost-effective, fast and reliable welding methods for thin aluminum and copper foil applications (welding of dissimilar materials) for e-mobility.
Non-contact laser welding offers an attractive option, but has not been usable in the past with foil thicknesses below 200 μm. Now, a new type of Adjustable Ring Mode (ARM) fiber laser with a high brightness center beam overcomes these limitations.
The ARM laser ring beam first preheats the material to increase the material absorption. Then, the center beam, with its high brightness (high energy density but low total energy), performs the actual welding without damaging the material by introducing in too much heat. Finally, the independently controlled ramp down of the ring power allows the material to cool in a controlled manner, thus minimizing weld pool turbulence and eliminating spatter.
Learn more: bit.ly/2VxmO0B