Cell manufacturing/Formation
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< Battery value chain | Process | Cell manufacturingBattery value chain/Process/Cell manufacturing/Formation
Description
Production process
- Formation is first charging and discharging processes of the cell
- Cells are stored in formation racks and contacted by spring-loaded contact pins
- Cells are charged / discharged according to predefined current and voltage curves
- During formation, lithium ions are embedded in the crystal structure of the graphite on the anode side which leads to formation of the Solid Electrolyte Interface (SEI); SEI creates an interface layer between electrolyte and electrode
- Parameters during formation have high impact on cell performance
Process parameters & requirements
- First charge: approx. 0.1 C - 0.5 C; SOC approx. 20 % - 80 %
- Successive increase in C-rates with each charging and discharging cycle
- Duration: up to 24 h
- Low contact resistances at the spring-loaded contact pins
Technology alternatives
- Different formation procedures
Quality influences
- Orientation of the cells
- Contact method
- Process temperature
- Pressurisation, especially of pouch cells
Quality features
- Formation of the SEI layer
- Stability of the SEI layer
- Internal resistance of the 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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Outgoing
Subject | Property | Object |
---|---|---|
Cell manufacturing/Formation | HasPredecessor | Cell manufacturing/Electrolyte Filling |
Cell manufacturing/Formation | HasSuccessor | Cell manufacturing/Degassing |
Incoming
Semantic Statements
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