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Cell manufacturing/Separation

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Revision as of 10:48, 15 June 2021 by Christina Leinauer (talk | contribs) (==Production process== *Separation is necessary for the production of the pouch cell and describes the separation of * anode, cathode and separator sheets from the (bought) roll material (daughter rolls). *The dried daughter rolls are unwound and fed to)


Description

Production process

  • Separation is necessary for the production of the pouch cell and describes the separation of * anode, cathode and separator sheets from the (bought) roll material (daughter rolls).
  • The dried daughter rolls are unwound and fed to the separation tool.
  • The cutting process is usually carried out with a shear cut (punching tool) in a continuous process.
  • Depending on the system concept, the individual sheets (coated on both sides) are stored in a magazine or transferred directly to the next process step.
  • The blank edge of the sheets are later used as the welding area for the cell tabs.
  • The waste as well as the cutting dusts are extracted and transported away in the process.

Process parameters & requirements

  • Separation time punching: approx. 0.2 s/sheet
  • Tolerance requirements: approx. ±200 μm width and length tolerance for the sheets
  • Punching tool: Very good cutting edge quality (depending on wear resistance)

Technology alternatives

  • Laser ablation: A guided laser beam allows the active material to be ablated again at defined points, thus exposing the carrier foil. This technology offers a high flexibility with regard to the positioning of the cell tabs.
  • Laser cutting: Instead of a conventional punching tool, the electrodes can also be cut out by a laser.

Quality influences

  • Heat-affected zone and suction of evaporated material during laser cutting
  • Finishing of tools
  • Cutting/punching speed

Quality features

  • Cutting edge geometry (e.g. smearing of the active material over the cutting edges)
  • Thermal and mechanical stress during the cutting process

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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