Battery value chain/Process/Cell manufacturing/Electrolyte Filling

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Production process

• After the packaging process the electrolyte is filled in.
• During electrolyte filling, a distinction must be made between the sub-processes "filling" and "wetting".
• The electrolyte is filled into the cell under vacuum (filling) with the help of a high-precision dosing needle.
• By applying a pressure profile to the cell (supply of inert gas and/or generation of a vacuum in alternating operation), the capillary effect in the cell is activated (wetting).
• Evacuation and partial filling are repeated several times depending on the manufacturer and cell type.
• Finally, the pouch foil is sealed under vacuum.
• The electrolyte (e.g. LiPF6) is usually a purchased component and sets high requirements on the process environment (fire protection, extraction, etc.), due to its classification as a hazardous substance.

Process parameters & requirements

• Geometry of the dosing needle
• Working pressure: approx. 0.01 mbar
• Consistent, continuous or cyclic filling to ensure homogeneous electrolyte distribution
• Very dry environment necessary
• Gravimetric control of the electrolyte quantity

Technology alternatives

No alternatives in series production.

Quality influences

• Dosing method (e.g. dosing pump)
• Geometry and closing mechanism of the dosing needle
• Electrolyte transport system (piping, etc.)

Quality features

• Dosing and distribution accuracy of the electrolyte in the cell
• No 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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Subject	Property	Object
Cell manufacturing/Electrolyte Filling	HasPredecessor	Cell manufacturing/Packaging
Cell manufacturing/Electrolyte Filling	Category	Glossary Entry
Cell manufacturing/Electrolyte Filling	HasSuccessor	Cell manufacturing/Formation

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