Abstract
In this paper, a fast equalizer for series-connected battery packs with adaptive balancing current control is proposed. As the duty cycle of the power switch in conventional equalizers is kept constant during the equalization process, smaller voltage difference between cells will decrease balancing current and consequently result in extended balancing time, especially in the later phase of equalization. To deal with this problem and take the battery nonlinearity and circuit parameter non-ideality into consideration, an adaptive balancing current control based on a fuzzy logic inference is proposed. The presented approach can adjust the duty ratio adaptively, according to voltages of individual cells and pack, to keep the balancing current nearly constant: Therefore, the balancing time can be shortened and the balancing efficiency can be improved. Finally, experimental results of three compared methods will be given and discussed to validate the feasibility, effectiveness, and performance improvement of the studied method.
Highlights
Energy storage systems consist of series-connected batteries have been widely applied to electric vehicles, renewable energy systems, and uninterruptible power supplies to meet the requirements of high voltage and/or high power [1,2,3,4,5,6]
In order to cope with the problem of balancing current reduction in the later equalization stage and take the battery nonlinearity and circuit parameter non-ideality into consideration, an adaptive balancing current control based on a fuzzy logic inference is proposed
The duty cycle of the fixed duty duty cycle cycle (FDC) method remains fixed throughout the equalization process
Summary
Energy storage systems consist of series-connected batteries have been widely applied to electric vehicles, renewable energy systems, and uninterruptible power supplies to meet the requirements of high voltage and/or high power [1,2,3,4,5,6]. The reason is that the characteristics of individual cells in a battery string could be discrepant, due to the inevitable inconsistency in electrochemical properties from manufacturing process, ambient temperature variation during charging and discharging, and asymmetrical degradation with aging [7,8]. The cell voltages through the entire pack are inhomogeneous during the charging and discharging cycles. In order to guarantee a safe operating condition and prolong the battery longevity, the battery equalizer is essential for a series-connected battery pack to diminish the unbalanced charge phenomena, extend the pack available lifespan, and improve the overall performance
Sign-in/Register to view highlights & summary 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.
