Cell manufacturing/Stacking

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{{GlossaryEntry}}{{Semantic Element |label=Cell manufacturing/Stacking |description= ===Production process=== *Separated electrode sheets are stacked in a repeating cycle of anode, separator, cathode, separator, etc. *Classic variant of stacking is the so-called Z-folding *Anode and cathode sheets are inserted alternately from the left and right into the z-shaped folded separator; separator is used as endless tape and cut off after the stacking process is completed *Finalized cell stack is fixed with adhesive tape *Sheets are transported and positioned by vacuum grippers *Depending on cell specification, the cell stack consists of a specific number of individual layers ===Process parameters & requirements=== <gallery> File:Z-Falter Fraunhofer ISC.jpg|Z-Folder @ Fraunhofer ISC File:Z-Falter Fraunhofer ISC Progress.jpg|Z-Folder during stacking File:Z-Falter Fraunhofer ISC Result.jpg|Resulting electrode stack </gallery> *Z-folding: Individual anode and cathode sheets are placed laterally in the Z-folded separator web *Stacking accuracy: ± 200 μm - 300 μm ===Technology alternatives=== *Lamination process: The individual electrode and separator sheets are laminated onto each other in a continuous process and are then usually pressed together by a heat press. *Pocket Stacking: The cathode sheets are placed in a separator pocket. Afterwards cathode and anode sheets are stacked alternately. ===Quality influences=== *Exact positioning of individual sheets as central quality criterion. *Position detection and alignment of sheets of different sizes with a vacuum gripper *Mechanical pre-tensioning of the separator ===Quality features=== *Positioning accuracy of the anode and cathode sheets *Damage-free electrode surfaces and edges *Avoidance of electrostatic charging ===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 |relations={{Semantic Link |property=HasPredecessor |value=Battery value chain/Process/Cell manufacturing/Vacuum Drying }}{{Semantic Link |property=HasSuccessor |value=Battery value chain/Process/Cell manufacturing/Packaging }} }}

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