Determination of Cycle to Cycle Battery Cell Degradation with High-Precision Measurements

Due to the long life of lithium ion cells, it is difficult to measure their low capacity degradation from cycle to cycle. In order to accelerate the measurements, cells are often exposed to extreme stress conditions, which usually means elevated temperatures and high charging currents. This raises d...

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Bibliographic Details
Published in:Applied sciences 2022-12, Vol.12 (23), p.11876
Main Authors: Schürholz, Daniel, Schweighofer, Bernhard, Neumayer, Markus, Wegleiter, Hannes
Format: Article
Language:English
Subjects:
18650
Aging
Battery cycles
calendrical aging
capacity degradation
Climate change
cycle aging
Electric cells
Energy storage
High temperature
Leakage current
Li-ion
Lithium
Lithium-ion batteries
precision measurement
R&D
Research & development
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Summary:Due to the long life of lithium ion cells, it is difficult to measure their low capacity degradation from cycle to cycle. In order to accelerate the measurements, cells are often exposed to extreme stress conditions, which usually means elevated temperatures and high charging currents. This raises doubts as to whether the results obtained in this way are representative for real world applications. This work shows that, with the help of very precise capacity measurements, it is possible to determine cell aging in a few days even under normal operating conditions from cycle to cycle. To verify this, a self-built measurement system is used. After demonstrating the capabilities of the system, two different cycling schemes are used simultaneously to determine the various causes of aging—namely cycle aging, calendrical aging and self-discharge due to leakage currents.
ISSN:2076-3417
2076-3417
DOI:10.3390/app122311876