The Research on the Balancing Capacitor Parameter Identification Method for Electric Double-Layer Capacitor Modules.

The voltage imbalance between cells in electric double-layer capacitors will affect their performance and lifetime. Flying-capacitor equalization system can be employed to solve this problem. The balancing capacitor's parameter is essential for voltage balancing effect. The existing parameter identification method obtains a capacitance range based on the stable-state analysis of charging circuit and the balance effect by selecting a value from this range is not always optimized. In this paper, a novel parameter identification method based on zero-state response is proposed. Some simulation results show that smaller voltage difference and faster balancing rate can be achieved with this new approach.