Coherent | E-Mobility Battery Production: Laser Welding of Foil Stacks (Copper or Aluminum)
Production of pouch-type batteries for EV's and other applications require joining a large number of copper or aluminum foils to typically a Ni-plated copper tab. Up till now this has been difficult to accomplish with lasers, so ultrasonic welding has been employed, even though it creates weld issues with electrical continuity through the foil stack.
Now, a unique Coherent laser & welding head combination delivers high-quality welds, avoids the shunting problems of ultrasonic welding, and provides an ideal electrical connection with the highest conductivity when welding foil stacks of even greater than 120 foils – a truly groundbreaking result that cannot be achieved with other current technologies.
For this new approach, the adjustable ring mode fiber laser which produces a circular center beam surrounded by a ring beam is used together with the unique wobbling technology of the SmartWeld+ processing head. 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.
Learn more about our Advanced Fiber Lasers at https://bit.ly/4eFQhte and the SmartWeld+ processing head at https://bit.ly/45PcC3G
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#copperwelding
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