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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Outgoing

Subject	Property	Object
Cell manufacturing/Packaging	HasPredecessor	Cell manufacturing/Stacking
Cell manufacturing/Packaging	HasSuccessor	Cell manufacturing/Electrolyte Filling