Cell manufacturing/EOL Testing

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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

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Outgoing

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

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External Identifiers

IRI:

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