Cell manufacturing/Degassing

{{GlossaryEntry}}{{Semantic Element
|label=Cell manufacturing/Degassing
|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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