Cell manufacturing/Formation

From KIproBatt Wiki
< Battery value chain‎ | Process‎ | Cell manufacturingBattery value chain/Process/Cell manufacturing/Formation
VisualWikitext
(Created page with "{{Semantic Element |label=Cell manufacturing/Formation |description===Production process== *The formation describes the first charging and discharging processes of the batt...")
 
m (Text replacement - "Has predecessor" to "HasPredecessor")
 
(3 intermediate revisions by 2 users not shown)
Line 1: Line 1:
−
{{Semantic Element
+
{{GlossaryEntry}}{{Semantic Element
 
|label=Cell manufacturing/Formation
 
|label=Cell manufacturing/Formation
−
|description===Production process==
+
|description=
 +
===Production process===
  
−
*The formation describes the first charging and discharging processes of the battery cell.
+
*Formation is first charging and discharging processes of the cell
−
*For formation, the cells are put in special good carriers in formation racks and contacted by spring-loaded contact pins.
+
*Cells are stored in formation racks and contacted by spring-loaded contact pins
−
*The cells are then charged or discharged according to precisely defined current and voltage curves.
+
*Cells are charged / discharged according to predefined current and voltage curves
−
*During formation, lithium ions are embedded in the crystal structure of the graphite on the anode side. Here the Solid Electrolyte Interface (SEI) is formed, which creates a interface layer between the electrolyte and the electrode.
+
*During formation, lithium ions are embedded in the crystal structure of the graphite on the anode side which leads to formation of the Solid Electrolyte Interface (SEI); SEI creates an interface layer between electrolyte and electrode
−
*The parameters during formation vary depending on the cell manufacturer and have a high impact on cell performance. They depend on the cell concept and chemistry and represent the core knowledge of a cell manufacturer.
+
*Parameters during formation have high impact on cell performance
−
*In some cases, pouch cells in particular are pressurised during formation by special good carriers.
 
  
−
==Process parameters & requirements==
+
===Process parameters & requirements===
  
−
*First charge: approx. 0.1 C - 0.5 C; State of Charge (SOC) approx. 20 % - 80 %
+
*First charge: approx. 0.1 C - 0.5 C; SOC approx. 20 % - 80 %
 
*Successive increase in C-rates with each charging and discharging cycle
 
*Successive increase in C-rates with each charging and discharging cycle
−
*Duration of formation process: up to 24 h
+
*Duration: up to 24 h
 
*Low contact resistances at the spring-loaded contact pins
 
*Low contact resistances at the spring-loaded contact pins
  
−
==Technology alternatives==
+
===Technology alternatives===
  
−
*There are different procedures for the formation depending on the cell manufacturer and cell chemistry.
+
*Different formation procedures  
  
−
==Quality influences==
+
===Quality influences===
  
 
*Orientation of the cells
 
*Orientation of the cells
Line 28: Line 28:
 
*Pressurisation, especially of pouch cells
 
*Pressurisation, especially of pouch cells
  
−
==Quality features==
+
===Quality features===
  
 
*Formation of the SEI layer
 
*Formation of the SEI layer
Line 34: Line 34:
 
*Internal resistance of the cell
 
*Internal resistance of the cell
  
−
==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
 +
 
|relations={{Semantic Link
 
|relations={{Semantic Link
−
|property=Has predecessor
+
|property=HasPredecessor
 
|value=Battery value chain/Process/Cell manufacturing/Electrolyte Filling
 
|value=Battery value chain/Process/Cell manufacturing/Electrolyte Filling
 +
}}{{Semantic Link
 +
|property=HasSuccessor
 +
|value=Battery value chain/Process/Cell manufacturing/Degassing
 
}}
 
}}
 
}}
 
}}

Latest revision as of 04:18, 4 September 2022


Description

Production process

  • Formation is first charging and discharging processes of the cell
  • Cells are stored in formation racks and contacted by spring-loaded contact pins
  • Cells are charged / discharged according to predefined current and voltage curves
  • During formation, lithium ions are embedded in the crystal structure of the graphite on the anode side which leads to formation of the Solid Electrolyte Interface (SEI); SEI creates an interface layer between electrolyte and electrode
  • Parameters during formation have high impact on cell performance

Process parameters & requirements

  • First charge: approx. 0.1 C - 0.5 C; SOC approx. 20 % - 80 %
  • Successive increase in C-rates with each charging and discharging cycle
  • Duration: up to 24 h
  • Low contact resistances at the spring-loaded contact pins

Technology alternatives

  • Different formation procedures

Quality influences

  • Orientation of the cells
  • Contact method
  • Process temperature
  • Pressurisation, especially of pouch cells

Quality features

  • Formation of the SEI layer
  • Stability of the SEI layer
  • Internal resistance of the cell

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


Semantic Links

Add or edit outgoing links
To edit incoming links, go to the subjects site.

Outgoing

Incoming

Semantic Statements

Add statement


External Identifiers

IRI:





Retrieved from "https://kiprobatt.de/w/index.php?title=Battery_value_chain/Process/Cell_manufacturing/Formation&oldid=13183"