A method for on-line monitoring of vanadium ion concentration in all-vanadium redox flow battery

Abstract

The invention relates to a method for on-line monitoring of the concentration of vanadium ions in an all-vanadium redox flow battery, which comprises the following steps: 1) Potential monitoring: installing a reference at the liquid inlets of the positive and negative liquid storage tanks of the all-vanadium redox flow battery The electrode and working electrode, the potential tester monitors the change of the positive electrode potential and the negative electrode potential of the all-vanadium redox flow battery in real time through the reference electrode and the working electrode connected with it. From the obtained test potential, the battery’s potential can be obtained according to the relevant potential calculation formula. Charge and discharge state; 2) Vanadium ion concentration monitoring: adopt potentiometric titration method, use titrant, and perform potentiometric titration by potentiometric titrator to obtain vanadium ion concentration. The advantages of the present invention are that the monitoring method is simple, convenient, easy to operate and control, has high accuracy, and will not pollute the electrolyte of the battery; not only the charging and discharging state of the battery can be monitored online, but also the positive and negative poles of the battery can be monitored regularly Changes in the concentration of vanadium ions in the electrolyte, and monitor whether the charge and discharge states of the positive and negative electrodes are consistent.

Description

technical field [0001] The invention relates to the field of energy storage batteries, in particular to a method for on-line monitoring of the concentration of vanadium ions in an all-vanadium redox flow battery, which is applied to the monitoring of the positive and negative valence states of the all-vanadium redox flow battery and to deal with the balance of electrolyte concentration . Background technique [0002] According to relevant information, the state of the active material contained in the solid electrode of the all-vanadium redox flow battery is different from that of the ordinary battery. The positive and negative active materials of the all-vanadium redox flow battery mainly exist in the electrolyte, so the used contains The electrolytes of the positive and negative active materials are respectively installed in two liquid storage tanks; when the all-vanadium redox flow battery is working, the electrolyte containing the positive and negative active materials ci...

AI Technical Summary

Problems solved by technology

[0006] The applicant found in the research that the above-mentioned existing technologies all use the measurement potential to monitor the change of the valence concentration ratio of the positive and negative vanadium ions, that is, to monitor the state of charge and discharge (SOC) of the all-vanadium redox flow battery, but cannot monitor the vanadium ion concentration ratio. Changes in ion concentration

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