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Cell manufacturing/Vacuum Drying

< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Vacuum Drying
Battery value chainProcessCell manufacturingCell manufacturing/Vacuum Drying
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|label=Cell manufacturing/Vacuum Drying
 
|label=Cell manufacturing/Vacuum Drying
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|description===Production process==
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|description=
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===Production process===
  
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*The coated daughter rolls are pushed onto a special goods carrier.
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*Stacks are stored in a vacuum oven
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*The coils are then stored in a vacuum oven.
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*During the drying process, residual moisture and solvents are removed from the electrodes, resp., stacks
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*The drying time is approx. 12 h to 30 h. During the drying process, residual moisture and solvents are removed from the coils.
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*Reduction of residual moisture is achieved by evaporation at low temperatures as a result of a low total pressure
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*The reduction of residual moisture is achieved by evaporation at low temperatures as a result of a low total pressure.
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*After vacuum drying, stacks are transferred directly to the dry room or dry packed under vacuum
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*After vacuum drying has been completed, the coils are transferred directly to the dry room or dry packed under vacuum.
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*Vacuum ovens can be operated with inert gas in order to prevent corrosion.
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*The vacuum ovens are often used as air locks into the dry room (for daughter rolls).
 
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*In addition, it is possible to operate the vacuum ovens with inert gas in order to prevent corrosion.
 
  
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==Process parameters & requirements==
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===Process parameters & requirements===
  
 
*Working pressure: 0.07 mbar < p < 1000 mbar
 
*Working pressure: 0.07 mbar < p < 1000 mbar
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*Inert gas supply
 
*Inert gas supply
  
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==Technology alternatives==
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===Quality influences===
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*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.
 
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*Infrared dryer: Both technologies can be supplemented by infrared heating.
 
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==Quality influences==
 
  
 
*Constant heat supply and stable vacuum
 
*Constant heat supply and stable vacuum
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*Inert gas supply against corrosion
 
*Inert gas supply against corrosion
  
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==Quality features==
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===Quality features===
  
 
*Surface condition (cracks, etc.)
 
*Surface condition (cracks, etc.)
 
*Residual moisture content (no residual moisture desired)
 
*Residual moisture content (no residual moisture desired)
  
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==Source==
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===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
 
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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|value=Battery value chain/Process/Cell manufacturing/Separation
 
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}}{{Semantic Link
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|value=Battery value chain/Process/Cell manufacturing/Stacking
 
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Latest revision as of 04:15, 4 September 2022


Description

Production process

  • Stacks are stored in a vacuum oven
  • During the drying process, residual moisture and solvents are removed from the electrodes, resp., stacks
  • Reduction of residual moisture is achieved by evaporation at low temperatures as a result of a low total pressure
  • After vacuum drying, stacks are transferred directly to the dry room or dry packed under vacuum
  • Vacuum ovens can be operated 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

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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