Exploring the correlation between ultrasound speed and the state of health of LiFePO4 prismatic cells
Electric vehicles (EVs) have become a popular mode of transportation, with their performance depending on the ageing of the Li-ion batteries used to power them. However, it can be challenging and time-consuming to determine the capacity retention of a battery in service. A rapid and reliable test...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/176040 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Electric vehicles (EVs) have become a popular mode of transportation, with
their performance depending on the ageing of the Li-ion batteries used to power
them. However, it can be challenging and time-consuming to determine the
capacity retention of a battery in service. A rapid and reliable testing method
for state of health (SoH) determination is desired. Ultrasonic testing
techniques are promising due to their efficient, portable, and non-destructive
features. In this study, we demonstrate that ultrasonic speed decreases with
the degradation of the capacity of an LFP prismatic cell. We explain this
correlation through numerical simulation, which describes wave propagation in
porous media. We propose that the reduction of binder stiffness can be a
primary cause of the change in ultrasonic speed during battery ageing. This
work brings new insights into ultrasonic SoH estimation techniques. |
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