Cell manufacturing/EOL Testing

Description

Production process

After finalizing the cell production, cells are tested in an End-Of-Line (EOL) testing process
Cells are transferred from their aging storage location to the testing station
EOL testing process may include the following tests:
- Capacity measurements (i.e., discharge to state of charge (SOC) of transport),
- Pulse tests,
- Internal resistance measurements (DC),
- Optical inspections,
- OCV tests,
- Leakage tests,
- ...
Sorting of cells according to EOL results (i.e., performance grading)
Packaging and transportation to customer

Process parameters & requirements

SOC for transportation: 5 % - 20 % SOC
Permissible loss rate: < 5 mV per week
Increased loss rate: > 5mV per week may indicate e.g. cell-internal short circuits

Technology alternatives

Different test sequences and durations

Quality influences

Cell handling

Quality characteristics

Low self-discharge
Low internal resistance
Constant capacity

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

Semantic Links

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Outgoing

Subject	Property	Object
Cell manufacturing/EOL Testing	HasPredecessor	Cell manufacturing/Aging
Cell manufacturing/EOL Testing	HasSuccessor	Module manufacturing