Abstract
The State of Health (SOH) is a crucial parameter for evaluating the stability of battery operation. The SOH can be investigated via electrochemical impedance spectroscopy (EIS), which is useful for nondestructive battery testing and studying the working mechanism of batteries. The traditional EIS method used for estimating the SOH of lithium-ion batteries requires a long test time, complex circuit structure, complex calculation, or huge history data, making it inconvenient for practical applications. This paper presents a straightforward, convenient, and efficient method for estimating the SOH of Li-ion batteries, reducing the measurement time (3 min) compared with full-range EIS measurement (30 min) by a factor of 10. This method is based on the ratio between the real part of the zero-crossing of a Nyquist plot (impedance at 0.99 Hz in this paper) and the real part of the low-frequency inflection point of the Nyquist plot (impedance at 1976 Hz in this paper). This method is validated by different battery experiments. The obtained results show that this indicator does not significantly change with the battery charging capacity, and could be used to estimate the Li-ion battery SOH with an average relative error of 4.46 % through a second-order fitting function, which is of utmost importance for practical applications.
Sign-in/Register to access full text options 
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.
