Assessing spatial non-uniformities in lithium-ion battery state of charge using ultrasound immersion testing
Enhancing the performance, safety and reliability of battery management systems is crucial for advancing the state of the art in battery electric vehicles. Current research explores the potential of ultrasound to monitor state of charge (SoC) changes in individual batteries. Understanding spatial variations in SoC is essential, as nonuniformities could lead to sub-optimal performance, premature ageing, and possible safety risks. This study uses ultrasound immersion testing to map wave speed and attenuation at different SoC levels during battery discharging. Results indicate nonuniform wave speed and attenuation suggestive of SoC spatial variations within single cells. Future work will include acoustic measurements under various discharge rates and relaxation periods to provide further insights into SoC inhomogeneities. Potential causes of structure and manufacturing variations of the battery are discussed, highlighting the need to address these issues to prevent over-charging/overdischarging in specific battery areas.
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| Work Title | Assessing spatial non-uniformities in lithium-ion battery state of charge using ultrasound immersion testing |
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| License | In Copyright (Rights Reserved) |
| Work Type | Article |
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| Publication Date | January 1, 2024 |
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| Deposited | June 03, 2025 |
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