Open AccessOperando Ultrasonic Monitoring of Lithium-Ion Battery Temperature and Behaviour at Different Cycling Rates and under Drive Cycle Conditions
Author(s) -
Rhodri E. Owen,
James B. Robinson,
Julia S. Weaving,
Martin Pham,
Thomas G. Tranter,
Tobias P. Neville,
D.R. Billson,
Michele Braglia,
Richard Stocker,
Annika Ahlberg Tiblad,
Paul R. Shearing,
Dan J. L. Brett
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac6833
Subject(s) - battery (electricity) , ultrasonic sensor , signal (programming language) , state of charge , ion , voltage , lithium (medication) , materials science , work (physics) , degradation (telecommunications) , acoustics , cycling , nuclear engineering , electrical engineering , automotive engineering , computer science , chemistry , engineering , mechanical engineering , physics , power (physics) , thermodynamics , medicine , history , organic chemistry , archaeology , endocrinology , programming language
Effective diagnostic techniques for Li-ion batteries are vital to ensure that they operate in the required voltage and temperature window to prevent premature degradation and failure. Ultrasonic analysis has been gaining significant attention as a low cost, fast, non-destructive, operando technique for assessing the state-of-charge and state-of-health of Li-ion batteries. Thus far, the majority of studies have focused on a single C-rate at relatively low charge and discharge currents, and as such the relationship between the changing acoustic signal and C-rate is not well understood. In this work, the effect of cell temperature on the acoustic signal is studied and shown to have a strong correlation with the signal’s time-of-flight. This correlation allows for the cell temperature to be inferred using ultrasound and to compensate for these effects to accurately predict the state-of-charge regardless of the C-rate at which the cell is being cycled. Ultrasonic state-of-charge monitoring of a cell during a drive cycle illustrates the suitability of this technique to be applied in real-world situations, an important step in the implementation of this technique in battery management systems with the potential to improve pack safety, performance, and efficiency.