Cell manufacturing/Aging
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Revision as of 11:12, 15 June 2021 by Christina Leinauer (talk | contribs)
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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Subject | Property | Object |
---|---|---|
Cell manufacturing/Aging | HasPredecessor | Cell manufacturing/Degassing |
Cell manufacturing/Aging | HasSuccessor | Cell manufacturing/EOL Testing |
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