Coherent | E-Mobility Battery Production: Laser Welding of up to 100 Copper Foils

Production of pouch type batteries for e-mobility and other applications requires joining as many as 100 copper foils to a Ni-plated copper tab. This has been difficult to accomplish with lasers, so ultrasonic welding has been used, even though it creates issues weld with electrical continuity through the foil stack. Now, a unique new Coherent laser delivers high quality welds, avoids the shunting problems with ultrasonic welding, and provides a perfect electrical connection with the highest conductivity. This unique source is the adjustable ring mode fiber laser which produces a circular center beam surrounded by ring beam. In this case, the CSM-ARM utilizes a high brightness center beam. The leading edge of the lower power ring beam gently heats the foil until material absorption increases, and the high intensity core then supplies sufficient energy for high speed welding. The surrounding material is kept soft and elastic by the ring, minimizing melt pool turbulence and preventing spatter. More info: https://www.coherent.com/lasers/laser/highLight-fl-arm-fiber-laser Founded in 1966, Coherent Inc. is one of the world’s leading providers of lasers and laser-based technology for industrial, commercial, and scientific customers. Our common stock is listed on the Nasdaq Global Select Market and is part of the Russell 1000 and Standard & Poor’s MidCap 400 Index. For more information about Coherent, visit the company's website at https://www.coherent.com for product and financial updates.