Battery value chain/Process/Cell manufacturing/Vacuum Drying

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Production process

• The coated daughter rolls are pushed onto a special goods carrier.
• The coils are then stored in a vacuum oven.
• The drying time is approx. 12 h to 30 h. During the drying process, residual moisture and solvents are removed from the coils.
• The reduction of residual moisture is achieved by evaporation at low temperatures as a result of a low total pressure.
• After vacuum drying has been completed, the coils are transferred directly to the dry room or dry packed under vacuum.
• The vacuum ovens are often used as air locks into the dry room (for daughter rolls).
• In addition, it is possible to operate the vacuum ovens with inert gas in order to prevent corrosion.

Process parameters & requirements

• Working pressure: 0.07 mbar < p < 1000 mbar
• Drying time: 12 h - 30 h per batch
• Drying temperature: 60°C - 150°C
• Inert gas supply

Technology alternatives

• Continuous dryers: In contrast to the chamber concept, there are also continuous drying processes in which the daughter rolls are transported through a long drying facility in a wound or unwound state.
• Infrared dryer: Both technologies can be supplemented by infrared heating.

Quality influences

• Constant heat supply and stable vacuum
• Longer resting times only possible in the dry room
• Inert gas supply against corrosion

Quality features

• Surface condition (cracks, etc.)
• Residual moisture content (no residual moisture desired)

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

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