Cell manufacturing/EOL Testing

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< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/EOL Testing
Battery value chainProcessCell manufacturingCell manufacturing/EOL Testing
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|label=Cell manufacturing/EOL Testing
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|description====Production process===
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===Production process===
 
  
 
*After finalizing the cell production, cells are tested in an End-Of-Line (EOL) testing process
 
*After finalizing the cell production, cells are tested in an End-Of-Line (EOL) testing process
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===Source===
 
===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
 
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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Revision as of 18:15, 19 November 2021


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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