Cell manufacturing/Separation

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< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Separation
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{{Semantic Element
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{{GlossaryEntry}}{{Semantic Element
 
|label=Cell manufacturing/Separation
 
|label=Cell manufacturing/Separation
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|description===Production process==
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|description=
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===Production process===
  
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*Separation is necessary for the production of the pouch cell and describes the separation of * anode, cathode and separator sheets from the (bought) roll material (daughter rolls).
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*Separation is the separation of anode, cathode, and separator sheets from roll material (daughter rolls)
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*The dried daughter rolls are unwound and fed to the separation tool.
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*Dried daughter rolls are fed to separation machine
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*The cutting process is usually carried out with a shear cut (punching tool) in a continuous process.
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*Punching tool carries out shear cut in a continuous process
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*Depending on the system concept, the individual sheets (coated on both sides) are stored in a magazine or transferred directly to the next process step.
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*Individual sheets (coated on both sides) are transferred directly to the next process step
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*The blank edge of the sheets are later used as the welding area for the cell tabs.
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*Blank edge of sheets are later used as welding area for cell tabs
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*The waste as well as the cutting dusts are extracted and transported away in the process.
 
  
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==Process parameters & requirements==
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===Process parameters & requirements===
  
 
*Separation time punching: approx. 0.2 s/sheet
 
*Separation time punching: approx. 0.2 s/sheet
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*Punching tool: Very good cutting edge quality (depending on wear resistance)
 
*Punching tool: Very good cutting edge quality (depending on wear resistance)
  
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==Technology alternatives==
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===Technology alternatives===
  
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*Laser ablation: A guided laser beam allows the active material to be ablated again at defined points, thus exposing the carrier foil. This technology offers a high flexibility with regard to the positioning of the cell tabs.
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*Laser ablation: Guided laser beam allows active material to be ablated again at defined points, thus exposing the carrier foil
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*Laser cutting: Instead of a conventional punching tool, the electrodes can also be cut out by a laser.
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*Laser cutting: Electrodes not pounched, but cut out by laser
  
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==Quality influences==
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===Quality influences===
  
 
*Heat-affected zone and suction of evaporated material during laser cutting
 
*Heat-affected zone and suction of evaporated material during laser cutting
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*Cutting/punching speed
 
*Cutting/punching speed
  
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==Quality features==
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===Quality features===
  
 
*Cutting edge geometry (e.g. smearing of the active material over the cutting edges)
 
*Cutting edge geometry (e.g. smearing of the active material over the cutting edges)
 
*Thermal and mechanical stress during the cutting process
 
*Thermal and mechanical stress during the cutting process
  
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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 successor
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|property=HasPredecessor
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|value=Battery_value_chain/Process/Component_manufacturing
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}}{{Semantic Link
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|property=HasSuccessor
 
|value=Battery value chain/Process/Cell manufacturing/Vacuum Drying
 
|value=Battery value chain/Process/Cell manufacturing/Vacuum Drying
 
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Latest revision as of 04:18, 4 September 2022


Description

Production process

  • Separation is the separation of anode, cathode, and separator sheets from roll material (daughter rolls)
  • Dried daughter rolls are fed to separation machine
  • Punching tool carries out shear cut in a continuous process
  • Individual sheets (coated on both sides) are transferred directly to the next process step
  • Blank edge of sheets are later used as welding area for cell tabs

Process parameters & requirements

  • Separation time punching: approx. 0.2 s/sheet
  • Tolerance requirements: approx. ±200 μm width and length tolerance for the sheets
  • Punching tool: Very good cutting edge quality (depending on wear resistance)

Technology alternatives

  • Laser ablation: Guided laser beam allows active material to be ablated again at defined points, thus exposing the carrier foil
  • Laser cutting: Electrodes not pounched, but cut out by laser

Quality influences

  • Heat-affected zone and suction of evaporated material during laser cutting
  • Finishing of tools
  • Cutting/punching speed

Quality features

  • Cutting edge geometry (e.g. smearing of the active material over the cutting edges)
  • Thermal and mechanical stress during the cutting process

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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