Parametric Study of Spot Welding between Li-ion Battery Cells and Sheet Metal Connectors

  • Manop Masomtob Rheinisch-Westfälische Technische Hochschule Aachen University
  • Rawitat Sukondhasingha Rheinisch-Westfälische Technische Hochschule Aachen University
  • Jan Becker Rheinisch-Westfälische Technische Hochschule Aachen University
  • Dirk Uwe Sauer Rheinisch-Westfälische Technische Hochschule Aachen University

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Abstract

This work was designed to study the effects of influencing parameters in series/parallel gap spot welding process and determine the optimized parameters setting for spot welding between 18650 Li-ion battery cells and sheet metal connectors. The welding parameters that were studied in this work include electrode tip geometry, connecting strip material and design, maximum supply voltage, welding time welding force and distance between two electrodes. The effects of these parameters were investigated via simulations and experimentations. A sample battery cell was disassembled and measured to create the 3D models. Simulations were carried out software to observe the deformation, electric current distribution as well as temperature distribution occurred within the models. For experiments done in this work, the actual spot welding was conducted using the Miyachi FD120 series spot welding machine. The trial welding was first performed between two different thicknesses of Hilumin® connecting strips themselves. Then, after having the results of studied parameters from both simulations and experiments compared and analyzed, the actual spot welding was conducted between Hilumin® connecting strips and both of positive and negative terminals of SAMSUNG INR18650-15L Li-ion battery cells. The electric resistance and mechanical strength of the welded contact were measured. Finally, the suistriple welding parameter setting ranges were obtained as a result, which can be applied to create battery packs either from the similar or other different models of 18650 Li-ion cells via series spot welding processes.

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Author Biographies
Manop Masomtob

Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, 52066, Germany

Juelich Aachen Research Alliance, JARA-Energy, Germany

Materials for Energy Research Unit, National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand

Rawitat Sukondhasingha

Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, 52066, Germany

Jan Becker

Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, 52066, Germany

Juelich Aachen Research Alliance, JARA-Energy, Germany

Dirk Uwe Sauer

Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, 52066, Germany

Institute for Power Generation and Storage Systems (PGS), E.ON ERC, RWTH Aachen University, Aachen, 52074, Germany

Juelich Aachen Research Alliance, JARA-Energy, Germany

Published
Vol 21 No 7, Dec 29, 2017
How to Cite
M. Masomtob, R. Sukondhasingha, J. Becker, and D. Sauer, “Parametric Study of Spot Welding between Li-ion Battery Cells and Sheet Metal Connectors”, Engineering Journal, vol. 21, no. 7, pp. 457-473, Dec. 2017.

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