Method for testing balance degree of electrolyte of portable all-vanadium redox flow battery

Abstract

The invention discloses a method for testing the balance degree of the electrolyte of a portable all-vanadium redox flow battery. The method comprises the following steps that: step 1, an absorbance-concentration standard working curve is drawn; 2, a positive pole electrolyte and a negative pole electrolyte are sampled separately and simultaneously, and the sampled positive pole electrolyte and negative pole electrolyte are subjected to isopyknic mixing so as to undergo an oxidation-reduction reaction, and a mixed solution A can be obtained; step 3, a portable ultraviolet and visible spectrophotometer is adopted to obtain the concentration CV<3+> of trivalent vanadium ions in the mixed solution A; step 4, a reducing agent is added into the mixed solution A, so that a mixed solution B can be obtained, and the portable ultraviolet and visible spectrophotometer is adopted to obtain the maximum concentration Cm of the trivalent vanadium ions in the mixed solution B within testing time, andthe concentration of tetravalent vanadium ions in the mixed solution A is CVO<2+>, and CVO<2+>=Cm-CV3<+>; and step 5, the unbalance degree K of the whole electrolyte is calculated according to a formula that K=(CVO2<+>-CV3<+>) / (CVO2<+>+CV3<+>). The method has the advantages of convenience in operation, simplicity, rapidity, portable convenience, accurate detection and suitability for the on-sitedetection of the actual operation place of flow batteries.

Description

technical field [0001] The invention relates to a portable all-vanadium redox flow battery electrolyte balance test method, in particular to a method for using a portable device for detection and then obtaining electrolyte balance data, and belongs to the technical field of electrolyte flow battery electrolyte detection. Background technique [0002] In order to achieve sustainable development and improve the energy environment, humans have begun to use new energy sources such as wind energy and solar energy on a large scale. However, due to the instability of new energy power generation, it will have a greater impact on the grid when it is connected to the grid. Therefore, a large-scale energy storage system that can be used to calm power fluctuations and maintain power balance has emerged as the times require. Among them, all-vanadium redox flow batteries have the advantages of high efficiency, long life, large capacity, and deep charge and discharge. One of the main large...

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Problems solved by technology

[0011] Aiming at the problem that the detection methods in the above prior art are not convenient enough and need to be carried out under laboratory conditions, in the process, in fact, it takes a certain amount of time from sampling to detection. During this period, continuous operation The state of flow batteries is actually changing