Abstract To obtain the relationship between state of charge of lithium-ion battery and ultrasonic transmission features at low temperature, experiments and theory analysis on ultrasonic detection of the state of charge of cylindrically wound lithium-ion batteries were carried out. A fixing device was developed to improve the sensing stability and sensitivity. The feature extraction algorithm was proposed to extract ultrasonic signal amplitude (SA) and ultrasonic time-of-flight (TOF). The research on SOC detection by ultrasonic transmission method at low temperature was carried out. The maximum usable capacity of lithium-ion batteries was obtained. The results show that, the TOF is more accurate than the SA in state of charge detection of the lithium-ion battery at low temperature. The effects of low temperature on the elastic modulus, quality, and length of lithium-ion battery anode materials were investigated, and the quantified equations for the state of charge and ultrasonic transmission flight time of lithium-ion battery at low temperature were established. The coefficient of determination of the fitting between the quantization equation and the test data is 0.9668. This study can provide a reference for the accurate detection of lithium-ion battery SOC at low temperature.
Wu Lifeng,Liu Hao,Lin Zhongqin等. Relationship between State of Charge of Lithium-Ion Battery and Ultrasonic Transmission Flight Time at Low Temperature[J]. Transactions of China Electrotechnical Society, 2022, 37(21): 5617-5626.
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