Laser beam welding of copper foil stacks using a green high power disk laser

Sophie Grabmann, Lazar Tomcic, Michael F. Zaeh

Research output: Contribution to journalConference articlepeer-review

19 Scopus citations

Abstract

A major challenge in the manufacturing of lithium-ion batteries is the qualification of a production system that is able to provide the high quality requirements of the cells. For internal contacting, the demands on the joining process are very high due to the low foil thicknesses and the temperature sensitivity of the battery components. Currently used joining methods, like ultrasonic welding, have limitations, such as the risk of mechanical damages. Laser beam welding is a promising approach based on the contactless process principle. In this paper, process experiments on the laser beam welding of copper foils using a beam source emitting at a green wavelength are described. Stacks of 30 copper foils with a thickness of 10 µm each were welded. Different process strategies were applied and compared. The weld seams were evaluated by means of cross sections and topographic analyses. The investigations showed promising results using a beam source emitting at a green wavelength for the joining of foil stacks.

Original languageEnglish
Pages (from-to)582-586
Number of pages5
JournalProcedia CIRP
Volume94
DOIs
StatePublished - 2020
Externally publishedYes
Event11th CIRP Conference on Photonic Technologies, LANE 2020 - Virtual, Online
Duration: 7 Sep 202010 Sep 2020

Keywords

  • Copper Foil Stacks
  • E-Mobility
  • Green Wavelength
  • Laser Beam Welding
  • Lithium-Ion Battery

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