State-of-health characteristics of all-vanadium redox flow batteries

doi:10.19799/j.cnki.2095-4239.2022.0409

Abstract

Abstract:

The battery system's state of health(SOH)characteristic is a crucial indicator for the large-scale application of the new system for improving the battery energy storage system's dispatchability and operating economy. Based on the self-developed all-vanadium redox flow battery system test platform, this study simulates the actual operating conditions of the all-vanadium redox flow battery system for approximately two years of charging and discharging. Here, the capacity, energy efficiency, comprehensive valence state, and internal resistance changes of the all-vanadium redox flow battery test platform are summarized and analyzed. This study's experimental data show that under operating conditions, the annual SOH reduction of the all-vanadium redox flow battery system is approximately 4%, and the energy efficiency remains stable. Furthermore, the analysis found that the rapid increase in the concentration polarization internal resistance at the end of discharge caused by the average valence state change is the main reason for the capacity decline of the all-vanadium flow battery system. Moreover, the SOH of the all-vanadium redox flow battery system also shows a pronounced difference from other solid-state batteries, implying that the SOH of the all-vanadium redox flow battery can be 100% recoverable.

Key words: all vanadium flow battery, SOH(state of health), influencing factors

CLC Number:

TM 911

Shuang ZHANG, Jianing XU, Rongrong ZHANG, Zonghao LIU, Chenqi WANG, Ruonan LIU, Minglin RONG. State-of-health characteristics of all-vanadium redox flow batteries[J]. Energy Storage Science and Technology, 2022, 11(12): 4022-4029.

Figures/Tables 12

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参数	数值
额定功率	10 kW
额定容量	40 kWh
直流电压	DC36 V～57.6 V
最大直流电流	390 A
外形尺寸(W×D×H)	875 mm×1775 mm×2060 mm
运行环境温度	0～40 ℃

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