Open-circuit voltage variation during charge and shelf phases of an all-vanadium liquid flow battery

doi:10.19799/j.cnki.2095-4239.2021.0717

Abstract

Abstract:

Charge and shelf tests on an all-vanadium liquid flow battery are used to investigate the open-circuit voltage change during the shelving phase. It is discovered that the open-circuit voltage variation of an all-vanadium liquid flow battery is different from that of a nonliquid flow energy storage battery, which primarily consists of four processes: jumping down, slowly falling, slowly rising, and stabilizing. The four stages of an all-vanadium liquid flow battery's open-circuit voltage are first evaluated step by step in this study, and then, the causes and influencing elements for the gradual growth of the open-circuit voltage are investigated. The experimental results demonstrated that the slow rise of the open-circuit voltage of the all-vanadium liquid flow battery is related to the volume share of the electrolyte in the battery and flow rate, which is an important feature of the all-vanadium liquid flow battery during the end of charge and shelf phases. The slower the open-circuit voltage rises, the less the volume proportion of electrolyte in the battery. The steady rising of the open-circuit voltage becomes shorter and smaller as the electrolyte flow rate increases.

Key words: all-vanadium liquid flow battery, open-circuit voltage, nonliquid flow energy storage battery

CLC Number:

TM 911

Zhiying LU, Shan JIANG, Quanlong LI, Kexin MA, Teng FU, Zhigang ZHENG, Zhicheng LIU, Miao LI, Yongsheng LIANG, Zhifei DONG. Open-circuit voltage variation during charge and shelf phases of an all-vanadium liquid flow battery[J]. Energy Storage Science and Technology, 2022, 11(7): 2046-2050.

Figures/Tables 6

Fig. 1

Fig. 2

Table 1

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Fig. 4

Table 2

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Volume/mL	B点		C点		D点
Volume/mL	Time/s	Voltage/V	Time/s	Voltage/V	Time/s	Voltage/V
100	1	1.5102	53	1.4753	148	1.4806
175	1	1.5113	57	1.4769	213	1.4801
250	1	1.5125	67	1.4775	345	1.4803

Flow rate/mL	B点		C点		D点
Flow rate/mL	Time/s	Voltage/V	Time/s	Voltage/V	Time/s	Voltage/V
22	1	1.5102	53	1.4753	148	1.4806
35	1	1.5091	29	1.4842	100	1.4889

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