Cell manufacturing/Vacuum Drying

Description

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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Outgoing

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