Abstract
The second-use application technique is an effective method to deal with the retired batteries from electric vehicles, which avoids energy waste and reduce vehicle cost. Since the accelerated degradation fault results in the fast degradation of the battery performance, especially under the storage condition, it is urgently to be diagnosed before the second-use application. A fast diagnostic method is developed for the accelerated degradation fault with the following contributions. First, the unusual changes in the charging voltage that approach the upper limit (Back-end voltage) caused by accelerated degradation fault is detected. By the mechanism analysis, it is revealed that the correspondence between the unusual Back-end voltage variation and fault mechanism is deterministic. Second, according to the particular Back-end voltage variation, a novel fault feature (κ) is proposed. Furthermore, to calculate κ reliably, how to acquire the Back-end voltage is determined based on the full-voltage composition; the third-order spline least-square method is utilized to smooth the Back-end voltage data. Finally, the proposed diagnostic method for accelerated degradation fault is validated via the large number of retired batteries, which guarantees that even if the historical driving data is lost, the accelerated degradation fault can be effectively diagnosed with better accuracy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.