Cell manufacturing/Stacking
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< Battery value chain | Process | Cell manufacturingBattery value chain/Process/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
Z-Folder @ Fraunhofer ISC
Z-Folder during stacking
Resulting electrode stack
- 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
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Subject | Property | Object |
---|---|---|
Cell manufacturing/Stacking | HasPredecessor | Cell manufacturing/Vacuum Drying |
Cell manufacturing/Stacking | HasSuccessor | Cell manufacturing/Packaging |
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