Cell manufacturing/Aging

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

Semantic Links

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

Outgoing

Subject	Property	Object
Cell manufacturing/Aging	HasPredecessor	Cell manufacturing/Degassing
Cell manufacturing/Aging	HasSuccessor	Cell manufacturing/EOL Testing