Cell manufacturing/Packaging

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< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Packaging
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{{Semantic Element
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{{GlossaryEntry}}{{Semantic Element
 
|label=Cell manufacturing/Packaging
 
|label=Cell manufacturing/Packaging
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|description===Production process==
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|description=
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===Production process===
  
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*To package the pouch cell, the current collector foils (anode - copper and cathode - aluminium) are first contacted with the cell tabs using an ultrasonic or laser welding process.
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*Collector foils are contacted with the cell tabs using an ultrasonic or laser welding process.
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*The cell stack is then positioned in the pouch foil. For this purpose, the pouch foil is deep-drawn in an earlier process step.
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*Cell stack is positioned in pouch foil, which has previously been deep-drawn for this purpose
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*The pouch cell is usually sealed gas-tight on three sides in an impulse or contact sealing process.
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*Pouch cell is sealed gas-tight from three sides in an impulse or contact welding process
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*One side of the cell (often the bottom of the cell) is not finally sealed in order to be able to fill the cell with electrolyte in the next process step.
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*One side of the cell is not finally sealed in order to be able to fill the cell with electrolyte in the next process step
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*The packaging materials are generally to be regarded as purchased parts.
 
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*The deep drawing of the pouch foil is carried out either directly in the production line or in a separate process.
 
  
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==Process parameters & requirements==
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===Process parameters & requirements===
  
 
*Deep drawing: up to 6 mm
 
*Deep drawing: up to 6 mm
 
*Ultrasonic welding with approx. 15 kHz - 40 kHz
 
*Ultrasonic welding with approx. 15 kHz - 40 kHz
 
*Packaging material: aluminium composite film (polyamide/aluminium/polypropylene)
 
*Packaging material: aluminium composite film (polyamide/aluminium/polypropylene)
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*Rule of thumb: "1 mm sealing seam width corresponds to approximately one year of cell lifetime".
 
  
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==Technology alternatives==
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===Technology alternatives===
  
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*Book folding process: Instead of two individual pouch foils, a foil with two deep drawn cavities can also be used for insertion into the packaging. After the stack has been inserted, the foil is folded like a book and then sealed.
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*Book folding process: Foil with two deep drawn cavities is used for insertion into packaging; foil is folded like a book after the stack has been inserted and, then, sealed
  
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==Quality influences==
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===Quality influences===
  
 
*Reduction of thermal stress during contacting and sealing process
 
*Reduction of thermal stress during contacting and sealing process
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*Sealing temperature and pressure
 
*Sealing temperature and pressure
  
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==Quality features==
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===Quality features===
  
 
*Low contact resistance as well as low mechanical and thermal stress during the welding process
 
*Low contact resistance as well as low mechanical and thermal stress during the welding process
 
*Fatigue strength and tightness of the sealing seams
 
*Fatigue strength and tightness of the sealing seams
  
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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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|relations={{Semantic Link
 
|relations={{Semantic Link
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|property=Has predecessor
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|property=HasPredecessor
 
|value=Battery value chain/Process/Cell manufacturing/Stacking
 
|value=Battery value chain/Process/Cell manufacturing/Stacking
 
}}{{Semantic Link
 
}}{{Semantic Link
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|property=Has successor
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|property=HasSuccessor
 
|value=Battery value chain/Process/Cell manufacturing/Electrolyte Filling
 
|value=Battery value chain/Process/Cell manufacturing/Electrolyte Filling
 
}}
 
}}
 
}}
 
}}

Latest revision as of 04:18, 4 September 2022


Description

Production process

  • Collector foils are contacted with the cell tabs using an ultrasonic or laser welding process.
  • Cell stack is positioned in pouch foil, which has previously been deep-drawn for this purpose
  • Pouch cell is sealed gas-tight from three sides in an impulse or contact welding process
  • One side of the cell is not finally sealed in order to be able to fill the cell with electrolyte in the next process step

Process parameters & requirements

  • Deep drawing: up to 6 mm
  • Ultrasonic welding with approx. 15 kHz - 40 kHz
  • Packaging material: aluminium composite film (polyamide/aluminium/polypropylene)

Technology alternatives

  • Book folding process: Foil with two deep drawn cavities is used for insertion into packaging; foil is folded like a book after the stack has been inserted and, then, sealed

Quality influences

  • Reduction of thermal stress during contacting and sealing process
  • Seal seam width
  • Sealing temperature and pressure

Quality features

  • Low contact resistance as well as low mechanical and thermal stress during the welding process
  • Fatigue strength and tightness of the sealing seams

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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