Cell manufacturing/Degassing

{{Semantic Element
|label=Cell manufacturing/Degassing
|description===Production process==

*With many pouch cells (especially with larger cells) there is a strong evolution of gas during the first charging process.
*Pressurised good carriers are pressing this gas out of the cell into a dead space (also called a gas bag).
*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.
*The gas bag is separated and disposed as hazardous waste.
*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.
*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.

==Process parameters & requirements==

*Folding and gluing of sealing seams to increase volumetric energy density
*Damage-free folding of the edges
*Seam widths of up to 1 cm
*Sealing against moisture and oxygen

==Technology alternatives==

*Particularly in the case of smaller cells with lower gas generation and depending on the manufacturer, the gas bag is 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 (different 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
|relations={{Semantic Link
|property=Has predecessor
|value=Battery value chain/Process/Cell manufacturing/Formation
}}
}}