Abstract
AbstractThe existing equivalent modeling methods reported in literature focuses mainly on the battery cells and do not take the packing consistency state into consideration, which exists on the internal connected cells of the lithium‐ion battery pack. An improved equivalent circuit model is constructed and reported in this manuscript for the first time, which can be used to characterize the working characteristics of the packing lithium‐ion batteries. A new equilibrium concept named as state of balance is proposed as well as the calculation process, which is realized by considering the real‐time detected internal battery cell voltages. In addition, this new equilibrium concept aims to obtain more information on the real‐time consistency characterization of the battery pack. The improved adaptive equivalent circuit model is investigated by using the improved splice modeling method, in which the statistical noise properties are corrected and the additional parallel resistance‐capacitance circuit is introduced. The parameter correction treatment is carried out by comparing the estimated and experimental detected closed circuit voltages. Furthermore, the tracking error is found to be 0.005 V and accounts for 0.119% of the nominal battery voltage. By taking the packing consistency state and temperature correction into consideration, the accurate working characteristic expression is realized in the improved equivalent circuit modeling process. Finally, the model proposed in this manuscript presents a great number of advantages compared to other methods reported so far, like has the high accuracy, and the ability to protect the security of the lithium‐ion battery pack in the power supply application.
Highlights
Funding informationNational Natural Science Foundation of China, Grant/Award Number: 61801407; National Key Specialty Construction Project of Clinical Pharmacy, Grant/Award Number: 30305030698; Sichuan Province Science and Technology Support Program, Grant/Award Number: 19ZDYF1098, 2018GZ0390 and 2017FZ0013; Scientific Research Fund of Sichuan, Grant/Award Number: 17ZB0453; Teaching Research Project, Grant/Award Number: 18lzx665, 18gjzx[11] and 18xnsu[12]; Sichuan Science and Technology Innovation Cultivation Project, Grant/Award Number: 201810619078 and 201810619096
The voltage and capacity of the single lithium-ion battery cell is very limited as a result they should be connected together and used as packs that are suitable for the industrial energy power supplies, especially for the Unmanned Aerial Vehicles (UAVs).[1]
As the material and process variations cannot be avoided, the imbalance phenomena exits among the internal connected cells of the lithium-ion battery pack,[2] which makes the balance state evaluation to be necessary for power supply applications.[3]
Summary
National Natural Science Foundation of China, Grant/Award Number: 61801407; National Key Specialty Construction Project of Clinical Pharmacy, Grant/Award Number: 30305030698; Sichuan Province Science and Technology Support Program, Grant/Award Number: 19ZDYF1098, 2018GZ0390 and 2017FZ0013; Scientific Research Fund of Sichuan, Grant/Award Number: 17ZB0453; Teaching Research Project, Grant/Award Number: 18lzx665, 18gjzx[11] and 18xnsu[12]; Sichuan Science and Technology Innovation Cultivation Project, Grant/Award Number: 201810619078 and 201810619096
Sign-in/Register to view highlights & summary 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.
