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-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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Outgoing

Subject	Property	Object
Cell manufacturing/Stacking	HasPredecessor	Cell manufacturing/Vacuum Drying
Cell manufacturing/Stacking	HasSuccessor	Cell manufacturing/Packaging