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Battery value chain/Process/Cell manufacturing/Separation (view source)
Revision as of 11:48, 15 June 2021
, 11:48, 15 June 2021==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
{{Semantic Element
{{Semantic Element
|label=Cell manufacturing/Separation
|label=Cell manufacturing/Separation
|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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