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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{{Semantic Element
 
{{Semantic Element
 
|label=Cell manufacturing/EOL Testing
 
|label=Cell manufacturing/EOL Testing
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|description===Production process==
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|description====Production process===
  
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*Before the cells leave the factory, they are tested in an EOL test rig.
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*After finalizing the cell production, cells are tested in an End-Of-Line (EOL) testing process
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*The cells are removed from the good carriers in the aging racks and fed to the testing station.
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*Cells are transferred from their aging storage location to the testing station
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*Here they are discharged to the shipping state of charge (capacity measurement).
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*EOL testing process may include the following tests:
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*Depending on the manufacturer, pulse tests, internal resistance measurements (DC), optical inspections, OCV tests and leakage tests are carried out.
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**Capacity measurements (i.e., discharge to state of charge (SOC) of transport),
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*After testing, many cell manufacturers sort the cells according to their performance data (grading).
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**Pulse tests,
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*Once the tests have been completed passed successfully, the cells can be packed and shipped.
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**Internal resistance measurements (DC),
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*For transport, the cells are usually provided with a plastic cover and stacked in a cardboard box.
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**Optical inspections,  
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**OCV tests,
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**Leakage tests,
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**...
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*Sorting of cells according to EOL results (i.e., performance grading)
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*Packaging and transportation to customer
  
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==Process parameters & requirements==
 
  
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*State of charge of the cell for shipping: 5 % - 20 % SOC
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===Process parameters & requirements===
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*SOC for transportation: 5 % - 20 % SOC
 
*Permissible loss rate: < 5 mV per week
 
*Permissible loss rate: < 5 mV per week
 
*Increased loss rate: > 5mV per week may indicate e.g. cell-internal short circuits
 
*Increased loss rate: > 5mV per week may indicate e.g. cell-internal short circuits
  
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==Technology alternatives==
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===Technology alternatives===
  
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*Different test sequences and durations exist depending on the cell manufacturer.
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*Different test sequences and durations
  
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==Quality influences==
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===Quality influences===
  
 
*Cell handling
 
*Cell handling
  
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==Quality characteristics==
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===Quality characteristics===
  
 
*Low self-discharge
 
*Low self-discharge
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*Constant capacity
 
*Constant capacity
  
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==Source==
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===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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|value=Battery value chain/Process/Cell manufacturing/Aging
 
|value=Battery value chain/Process/Cell manufacturing/Aging
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|property=HasSuccessor
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|value=Battery_value_chain/Process/Module_manufacturing
 
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Latest revision as of 04:16, 4 September 2022



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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