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

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