Cell manufacturing/Packaging
< 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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Outgoing
Subject | Property | Object |
---|---|---|
Cell manufacturing/Packaging | HasPredecessor | Cell manufacturing/Stacking |
Cell manufacturing/Packaging | HasSuccessor | Cell manufacturing/Electrolyte Filling |
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