Real-time monitoring of capacity loss for vanadium redox flow battery
Artikel i vetenskaplig tidskrift, 2018

The long-term operation of the vanadium redox flow battery is accompanied by ion diffusion across the separator and side reactions, which can lead to electrolyte imbalance and capacity loss. The accurate online monitoring of capacity loss is therefore valuable for the reliable and efficient operation of vanadium redox flow battery system. In this paper, a model-based online monitoring method is proposed to detect capacity loss in the vanadium redox flow battery in real time. A first-order equivalent circuit model is built to capture the dynamics of the vanadium redox flow battery. The model parameters are online identified from the onboard measureable signals with the recursive least squares, in seeking to keep a high modeling accuracy and robustness under a wide range of working scenarios. Based on the online adapted model, an observer is designed with the extended Kalman Filter to keep tracking both the capacity and state of charge of the battery in real time. Experiments are conducted on a lab-scale battery system. Results suggest that the online adapted model is able to simulate the battery behavior with high accuracy. The capacity loss as well as the state of charge can be estimated accurately in a real-time manner.

Battery modeling

State of charge

Capacity loss

Vanadium redox flow battery

Parameter identification


Zhongbao Wei

Nanyang Technological University

Arjun Bhattarai

Nanyang Technological University

Changfu Zou

Chalmers, Elektroteknik, System- och reglerteknik

Shujuan Meng

Beihang University

Tuti Mariana Lim

Nanyang Technological University

Maria Skyllas-Kazacos

University of New South Wales (UNSW)

Journal of Power Sources

0378-7753 (ISSN)

Vol. 390 261-269


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