Abstract
The influence of operating conditions such as temperature and state of charge on the performance of a high-power commercial lithium-ion pouch cell is explored using electrochemical impedance spectroscopy. State-of-charge and temperature ranges were selected based on relevance to automotive applications, such as DC Fast Charging, cold start, and high rate discharge events. Typical vehicle operation varies on the order of a few seconds and is therefore comparable with impedance values at frequencies higher than 0.1 Hz. Therefore, vehicle designers can utilize EIS as a tool to probe available power under standard operating conditions, as well as low temperatures and SOC in the vehicle at the battery cell level, offering the ability to decrease the amount of battery pack or vehicle level testing.Here, the full cell impedance is used to calculate electrochemical modeling parameters. Simulations using the parameters obtained from EIS are then compared to pulse tests and drive profiles for a large format pouch cell. Trends in the diffusion coefficients, reaction kinetics, and electrode conductivity as a function of state-of-charge and temperature will be discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
