Cell manufacturing/Separation

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Production process

• Separation is necessary for the production of the pouch cell and describes the separation of * anode, cathode and separator sheets from the (bought) roll material (daughter rolls).
• The dried daughter rolls are unwound and fed to the separation tool.
• The cutting process is usually carried out with a shear cut (punching tool) in a continuous process.
• Depending on the system concept, the individual sheets (coated on both sides) are stored in a magazine or transferred directly to the next process step.
• The blank edge of the sheets are later used as the welding area for the cell tabs.
• The waste as well as the cutting dusts are extracted and transported away in the process.

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: A guided laser beam allows the active material to be ablated again at defined points, thus exposing the carrier foil. This technology offers a high flexibility with regard to the positioning of the cell tabs.
• Laser cutting: Instead of a conventional punching tool, the electrodes can also be cut out by a 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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Subject	Property	Object
Cell manufacturing/Separation	HasSuccessor	Cell manufacturing/Vacuum Drying
Cell manufacturing/Separation	HasPredecessor	Component manufacturing

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