Cell manufacturing/Packaging

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< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Packaging


Description

Production process

  • Collector foils are contacted with the cell tabs using an ultrasonic or laser welding process.
  • Cell stack is positioned in pouch foil, which has previously been deep-drawn for this purpose
  • Pouch cell is sealed gas-tight from three sides in an impulse or contact welding process
  • One side of the cell is not finally sealed in order to be able to fill the cell with electrolyte in the next process step

Process parameters & requirements

  • Deep drawing: up to 6 mm
  • Ultrasonic welding with approx. 15 kHz - 40 kHz
  • Packaging material: aluminium composite film (polyamide/aluminium/polypropylene)

Technology alternatives

  • Book folding process: Foil with two deep drawn cavities is used for insertion into packaging; foil is folded like a book after the stack has been inserted and, then, sealed

Quality influences

  • Reduction of thermal stress during contacting and sealing process
  • Seal seam width
  • Sealing temperature and pressure

Quality features

  • Low contact resistance as well as low mechanical and thermal stress during the welding process
  • Fatigue strength and tightness of the sealing seams

Source

Heimes, H.H.; Kampker, A.; Lienemann, C.; Locke, M.; Offermanns, C.; Michaelis, S.; Rahimzei, E. (2018) Lithium-Ion Battery Cell Production Process; PEM of RWTH Aachen and VDMA, 3rd Edition, ISBN:978-3-947920-03-7


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