Cell manufacturing/Aging

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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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