Battery value chain/Process/Cell manufacturing/Degassing

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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

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