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| − | {{Semantic Element | + | {{GlossaryEntry}}{{Semantic Element |
| | |label=Cell manufacturing/Degassing | | |label=Cell manufacturing/Degassing |
| − | |description===Production process== | + | |description= |
| | + | ===Production process=== |
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| − | *With many pouch cells (especially with larger cells) there is a strong evolution of gas during the first charging process. | + | *Degassing is used to press out gas that evolved into dead spaces (i.e., gas bag) 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).
| + | *Gas bag is pierced in a vacuum chamber and the escaping gases are sucked off |
| − | *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. | + | *Gas bag is disposed and extracted gases are post-treated before entering the exhaust system |
| − | *The gas bag is separated and disposed as hazardous waste. | + | *Final sealing and folding of cell under vacuum after gas bag removal |
| − | *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.
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| − | *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.
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| − | ==Process parameters & requirements== | + | ===Process parameters & requirements=== |
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| | *Folding and gluing of sealing seams to increase volumetric energy density | | *Folding and gluing of sealing seams to increase volumetric energy density |
| | *Damage-free folding of the edges | | *Damage-free folding of the edges |
| − | *Seam widths of up to 1 cm | + | *Seam widths |
| | *Sealing against moisture and oxygen | | *Sealing against moisture and oxygen |
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| − | ==Technology alternatives== | + | ===Technology alternatives=== |
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| − | *Particularly in the case of smaller cells with lower gas generation and depending on the manufacturer, the gas bag is not separated after degassing. | + | *Depending on cell size, the gas bag is potentially not separated after degassing |
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| − | ==Quality influences== | + | ===Quality influences=== |
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| | *Pressing of the cells for degassing | | *Pressing of the cells for degassing |
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| | *Suction of gases under vacuum and in a dry atmosphere | | *Suction of gases under vacuum and in a dry atmosphere |
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| − | ==Quality features== | + | ===Quality features=== |
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| | *Residual gas inside the cell | | *Residual gas inside the cell |
| − | *Damage-free cell handling (different characteristics of the gas bubbles) | + | *Damage-free cell handling, depending on characteristics of the gas bubbles |
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| − | ==Source== | + | ===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 | | 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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| | |relations={{Semantic Link | | |relations={{Semantic Link |
| | |property=Has predecessor | | |property=Has predecessor |