Cell manufacturing/Packaging

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|label=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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