Battery value chain/Process/Cell manufacturing/Packaging

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

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