Cell manufacturing/Separation

Description

Production process

Separation is the separation of anode, cathode, and separator sheets from roll material (daughter rolls)
Dried daughter rolls are fed to separation machine
Punching tool carries out shear cut in a continuous process
Individual sheets (coated on both sides) are transferred directly to the next process step
Blank edge of sheets are later used as welding area for cell tabs

Process parameters & requirements

Separation time punching: approx. 0.2 s/sheet
Tolerance requirements: approx. ±200 μm width and length tolerance for the sheets
Punching tool: Very good cutting edge quality (depending on wear resistance)

Technology alternatives

Laser ablation: Guided laser beam allows active material to be ablated again at defined points, thus exposing the carrier foil
Laser cutting: Electrodes not pounched, but cut out by laser

Quality influences

Heat-affected zone and suction of evaporated material during laser cutting
Finishing of tools
Cutting/punching speed

Quality features

Cutting edge geometry (e.g. smearing of the active material over the cutting edges)
Thermal and mechanical stress during the cutting process

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/Separation	HasSuccessor	Cell manufacturing/Vacuum Drying
Cell manufacturing/Separation	HasPredecessor	Component manufacturing