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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Subject	Property	Object
Cell manufacturing/Degassing	HasSuccessor	Cell manufacturing/Aging
Cell manufacturing/Degassing	HasPredecessor	Cell manufacturing/Formation