Operando State of Charge Tracking of Second-Life Lithium-Ion Batteries Using Quantitative Ultrasound Spectroscopy
Affiliation Type:
Other
Keywords:
Quantitative ultrasound spectroscopy (QUS), lithium-ion batteries, second-life batteries, state of health, state of charge, non-destructive evaluation
Abstract:
Li-ion batteries play a crucial role in the global goal of decarbonizing electricity generation and transport. Battery Management Systems (BMS) require accurate tracking of batteries’ behavior for optimal and safe performance. BMS estimate two crucial metrics: the State of Charge (SOC) indicates the available battery charge, which is a measure of cumulative capacity, at a certain moment; and the State of health (SOH) refers to the battery storage capacity compared to its nominal value. Standard BMS only measure external variables such as voltage, current, and temperature. However, various groups have demonstrated that the time of flight of ultrasonic waves can be used to track battery changes. In this study, we used Quantitative Ultrasound Spectroscopy (QUS) to track SOC during battery operation (operando) for second-life batteries (SLBs) at different SOH.
