Review on Ultrasonic and Laser Welding Technologies of Multi-Layer Thin Foils for the Lithium-Ion Pouch Cell Manufacturing

Emission-reduction initiatives within the automotive sector have amplified the demand for electric and hybrid vehicles. An essential component in lithium-ion batteries for these vehicles is the pouch-type battery cell, which necessitates the welding of electrodes and tabs. Welding multi-layered thin foils, especially those only a few micrometers thick, is vital to ensure optimal performance and safety. The predominant techniques for this are ultrasonic and laser welding. This paper aims to provide a comprehensive review of contemporary advancements in ultrasonic and laser welding of multi-layer thin foils.