Cell manufacturing/Aging

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Revision as of 12:12, 15 June 2021


Description

Production process

  • Aging represents the final step in cell production and is used for quality assurance.
  • During aging, cell characteristics and cell performance are monitored by regularly measuring the open circuit voltage (OCV) of the cell over a period of up to three weeks.
  • A distinction is made between high temperature (HT) and normal temperature (NT) aging. The cells usually first undergo HT aging and then NT aging.
  • The cells are stored in so-called aging shelves and/or towers.
  • No significant change in the cell properties over the entire period of time means that the cell is fully functional and can be delivered to the customer.
  • In contrast to formation, the pouch cells are no longer pressurised in this process step.
  • The duration of the aging process depends strongly on the respective cell manufacturer and the cell chemistry used.

Process parameters & requirements

  • State of charge of the cell at the beginning of aging: 80 % - 100 % SOC
  • Aging time: up to 3 weeks
  • Normal temperature approx. 22°C, high temperature approx. 30°C - 50°C

Technology alternatives

  • There are different procedures for the sequence and duration of HT and NT aging depending on the cell manufacturer and cell chemistry.

Quality influences

  • Orientation of cells
  • Packing density of the cell good carriers
  • Ambient temperature

Quality features

  • Capacity
  • Internal resistance
  • Self-discharge rate

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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