Cell manufacturing/Degassing

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Revision as of 12:12, 15 June 2021


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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