Online impedance spectroscopy estimation of a dc–dc converter connected battery using a switched capacitor-based balancing circuit

• Main Authors: Mina Abedi Varnosfaderani, Dani Strickland
• Format: Article
• Language: English
• Published: Wiley 2019-06-01
• Series: The Journal of Engineering
• Subjects: secondary cells; battery management systems; DC-DC power convertors; electrochemical impedance spectroscopy; battery powered vehicles; switched capacitor networks; capacitors; frequency range; battery balancing circuit; switched capacitor balancing system; low-frequency; battery voltage; current; online impedance spectroscopy estimation; dc–dc converter connected battery; switched capacitor-based; online electrochemical impedance spectroscopy measurements; battery impedance
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8069
• ISSN: 2051-3305

This study investigates a novel method of undertaking online electrochemical impedance spectroscopy measurements to estimate battery impedance across the frequency range using a battery balancing circuit. A switched capacitor balancing system is used to generate an excitation signal of low-frequency of variable values from which battery voltage and current can be measured to estimate the impedance.