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

Abstract

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.

Keywords

• 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