Cell manufacturing/Electrolyte Filling
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< Battery value chain | Process | Cell manufacturingBattery value chain/Process/Cell manufacturing/Electrolyte Filling
Description
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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