Prospects of welding foils with solid state laser for lithium-ion batteries

Lithium-ion batteries will become a key element in future electro mobility. In a layered pouch cell design the electrical contacts consist of conductive foil tapes that have to be welded to the terminal. Common used ultra-sonic welding technologies have some processinherent restrictions like risk for mechanical damaging of the 10. . . 20 ?m thin Al or Cu foils, wear of the welding-sonotrode and limited mechanical strength and electrical conductivity of the welding spot caused by the adhesive bonding interfaces.