Cell manufacturing/Degassing

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< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Degassing
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|label=Cell manufacturing/Degassing
 
|label=Cell manufacturing/Degassing
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|description===Production process==
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|description=
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===Production process===
  
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*With many pouch cells (especially with larger cells) there is a strong evolution of gas during the first charging process.
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*Degassing is used to press out gas that evolved into dead spaces (i.e., gas bag) during the first charging process
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*Pressurised good carriers are pressing this gas out of the cell into a dead space (also called a gas bag).
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*Gas bag is pierced in a vacuum chamber and the escaping gases are sucked off
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*During degassing, the gas bag is pierced in a vacuum chamber and the escaping gases are sucked off. The cell is then finally sealed under vacuum.
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*Gas bag is disposed and extracted gases are post-treated before entering the exhaust system
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*The gas bag is separated and disposed as hazardous waste.
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*Final sealing and folding of cell under vacuum after gas bag removal
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*Final folding and, if necessary, gluing of the seal edges to reduce the external dimensions of the pouch cell can be carried out as an option.
 
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*The extracted gases must be post-treated (e.g. RTO) before they are fed into the exhaust system, depending on occupational health and safety and environmental protection regulations.
 
  
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==Process parameters & requirements==
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===Process parameters & requirements===
  
 
*Folding and gluing of sealing seams to increase volumetric energy density
 
*Folding and gluing of sealing seams to increase volumetric energy density
 
*Damage-free folding of the edges
 
*Damage-free folding of the edges
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*Seam widths of up to 1 cm
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*Seam widths  
 
*Sealing against moisture and oxygen
 
*Sealing against moisture and oxygen
  
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==Technology alternatives==
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===Technology alternatives===
  
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*Particularly in the case of smaller cells with lower gas generation and depending on the manufacturer, the gas bag is not separated after degassing.
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*Depending on cell size, the gas bag is potentially not separated after degassing
  
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==Quality influences==
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===Quality influences===
  
 
*Pressing of the cells for degassing
 
*Pressing of the cells for degassing
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*Suction of gases under vacuum and in a dry atmosphere
 
*Suction of gases under vacuum and in a dry atmosphere
  
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==Quality features==
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===Quality features===
  
 
*Residual gas inside the cell
 
*Residual gas inside the cell
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*Damage-free cell handling (different characteristics of the gas bubbles)
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*Damage-free cell handling, depending on characteristics of the gas bubbles
  
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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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|relations={{Semantic Link
 
|relations={{Semantic Link
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|property=Has predecessor
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|property=HasPredecessor
 
|value=Battery value chain/Process/Cell manufacturing/Formation
 
|value=Battery value chain/Process/Cell manufacturing/Formation
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}}{{Semantic Link
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|property=HasSuccessor
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|value=Battery value chain/Process/Cell manufacturing/Aging
 
}}
 
}}
 
}}
 
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Latest revision as of 05:18, 4 September 2022


Description

Production process

  • Degassing is used to press out gas that evolved into dead spaces (i.e., gas bag) during the first charging process
  • Gas bag is pierced in a vacuum chamber and the escaping gases are sucked off
  • Gas bag is disposed and extracted gases are post-treated before entering the exhaust system
  • Final sealing and folding of cell under vacuum after gas bag removal

Process parameters & requirements

  • Folding and gluing of sealing seams to increase volumetric energy density
  • Damage-free folding of the edges
  • Seam widths
  • Sealing against moisture and oxygen

Technology alternatives

  • Depending on cell size, the gas bag is potentially not separated after degassing

Quality influences

  • Pressing of the cells for degassing
  • Sealing and folding technology
  • Suction of gases under vacuum and in a dry atmosphere

Quality features

  • Residual gas inside the cell
  • Damage-free cell handling, depending on characteristics of the gas bubbles

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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