Cell manufacturing/Electrolyte Filling

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===Production process===

*Electrolyte filling follows the packaging process
*The electrolyte filling process consists of the two sub-processes "filling" and "wetting"
*Filling: Electrolyte is filled into the cell under vacuum
*Wetting: By supplying gas and/or generating a vacuum, the capillary effect in the cell is activated 
*Evacuation and partial filling repeated several times 
*Pouch foil is sealed under vacuum
*Electrolyte is usually a purchased substance; sets high requirements on process environment (fire protection, extraction, etc.)

===Process parameters & requirements===

*Geometry of the dosing needle
*Working pressure: approx. 0.01 mbar
*Homogeneous electrolyte distribution
*Necessity of very dry environment
*Control of electrolyte quantity

===Quality influences===

*Dosing method
*Geometry and closing mechanism of dosing
*Electrolyte transport system

===Quality features===

*Dosing and distribution accuracy of electrolyte in the cell
*Electrolyte residues in the sealing seam
*Tightness of the sealed cell

===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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