Laser Doppler Vibrometry for Evaluating the Quality of Welds in Lithium-Ion Supercells

Alon Ratner, Michael Wood, Maximilian Chowanietz, Nikhil Kumar, Rashik Patel, Paul Hadlum, Abhishek Das and Iain Masters
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Alon Ratner: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK
Michael Wood: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK
Maximilian Chowanietz: Polytec Ltd., Unit 8, The Cobalt Centre, Siskin Parkway East, Coventry CV3 4PE, UK
Nikhil Kumar: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK
Rashik Patel: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK
Paul Hadlum: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK
Abhishek Das: Department of Mechanical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, Delhi 110016, India
Iain Masters: Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK

Energies, 2022, vol. 15, issue 12, 1-20

Abstract: The inspection of the quality of welds in battery packs plays an important role in ensuring safety during the manufacturing and operation of energy-storage devices in automotive vehicles during service. This research investigated the novel application of laser Doppler vibrometry, a widely used non-destructive optical technique for modal analysis, to the post-weld evaluation of micro-TIG-welded interconnections in lithium-ion supercells. The experimental modal analysis showed features in the modal models of the supercells that were unique to their welding conditions. The comparisons between the supercells showed an absence of linear correlations between the modal parameters and the welding current, as well as differences in the welding parameters obtained from the negative and positive terminals of the cylindrical cells. These findings suggested that the modal parameters of the supercells were more strongly influenced by the rigidity of the structural materials than by the localized compliance of the welded interconnections. While this investigation demonstrated a method for using laser Doppler vibrometry to distinguish between different welding conditions in lithium-ion supercells at a structural level, further development is needed to identify the weld quality of individual interconnections.

Keywords: laser Doppler vibrometry; experimental modal analysis; lithium-ion cell; welding (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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