储能科学与技术 ›› 2022, Vol. 11 ›› Issue (12): 4022-4029.doi: 10.19799/j.cnki.2095-4239.2022.0409

• 储能测试与评价 • 上一篇    下一篇

全钒液流电池健康状态(SOH)特性

张爽1(), 许伽宁1, 张蓉蓉2, 刘宗浩2(), 王琛淇1, 刘若男2, 荣明林2   

  1. 1.国网辽宁省电力有限公司阜新供电公司,辽宁 阜新 123000
    2.大连融慧能源科技有限公司,辽宁 大连 116085
  • 收稿日期:2022-07-20 修回日期:2022-08-01 出版日期:2022-12-05 发布日期:2022-12-29
  • 通讯作者: 刘宗浩 E-mail:635142901@qq.com;zonghao.liu@ rongkepower.com
  • 作者简介:张爽(1991—),女,硕士,工程师,研究方向为电力调度与控制运行,E-mail:635142901@qq.com
  • 基金资助:
    化工园区垃圾发电与储能电池协调控制技术研究(2021YF-26)

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

摘要:

电池系统健康状态(SOH)特性的准确掌握和评估对于提高电池储能系统的可调度特性和运行的经济性具有重要意义,是新型储能系统大规模应用非常重要的一个指标。本研究基于自主开发的全钒液流电池系统测试平台,模拟全钒液流电池系统实际运行工况开展了近2年的充放电实验。本文对全钒液流电池测试平台2年内的容量、能量效率,平均价态及电池内阻变化进行了总结和分析。实验数据表明,在本研究运行工况下全钒液流电池系统年度SOH降低幅度大约为4%,能量效率保持基本稳定。分析发现,平均价态变化使得放电末期浓差极化内阻快速增加是导致全钒液流电池系统容量衰减的主要原因,同时全钒液流电池系统SOH表现出与其他固态电池非常明显的差异性,即全钒液流电池的SOH是可100%恢复的。

关键词: 全钒液流电池, 健康状态, 影响因素

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

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