Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (12): 4022-4029.doi: 10.19799/j.cnki.2095-4239.2022.0409

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

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

Shuang ZHANG1(), Jianing XU1, Rongrong ZHANG2, Zonghao LIU2(), Chenqi WANG1, Ruonan LIU2, Minglin RONG2   

  1. 1.State Grid Fuxin Electric Power Supply Company, Fuxin 123000, Liaoning, China
    2.Dalian Conspark Energy Co. , Ltd. , Dalian 116085, Liaoning, China
  • Received:2022-07-20 Revised:2022-08-01 Online:2022-12-05 Published:2022-12-29
  • Contact: Zonghao LIU E-mail:635142901@qq.com;zonghao.liu@ rongkepower.com

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: