Cell manufacturing/Separation
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< Battery value chain | Process | Cell manufacturingBattery value chain/Process/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 |
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