Ultrasonic monitoring performance degradation of lithium ion battery

• Published in: Microelectronics and reliability 2020-11, Vol.114, p.113859, Article 113859
• Main Authors: Kim, Jae-Yeon, Jo, Jang-Hun, Byeon, Jai-Won
• Format: Article
• Language: English
• ISSN: 0026-2714; 1872-941X
• DOI: 10.1016/j.microrel.2020.113859

To monitor the performance and reliability of a lithium-ion battery during charge/discharge cycles, an ultrasonic time-of-flight (ToF) and attenuation measurement was performed. Ultrasonic ToF of the reflected pulse echo increased with the decrease in the state of charge (SoC) and with the increase in number of cycles (i.e., degradation). A health evaluation map relating SoC with ToF at various cycles was constructed. In this map, ultrasonic hysteresis was reported, of which area reflected the magnitude of irreversible electrochemical damage to the battery material. A linear correlation between the ToF and the number of cycles was observed. •Ultrasonic wave technique for monitoring performance degradation of battery was investigated.•Ultrasonic time-of-flight increases with the decrease in the state of charge.•Ultrasonic time-of-flight was linearly correlated with the number of charge/discharge cycles.