Method and device for detecting charging state of vanadium cell

Abstract

The invention discloses a method for detecting a charging state of a vanadium cell, which comprises the following steps of: (1) using an angular spectrum type surface plasma resonance sensor to detect electrolyte of the vanadium cell, obtaining surface plasma resonance angular spectrum information of the electrolyte, and calculating to obtain a surface plasma resonance angle and / or refractive index of the electrolyte; and (2) inquiring or calculating to obtain the charging state of the vanadium cell according to the preset surface plasma resonance angle and / or the refractive index of the electrolyte under various parameters and a data bank related to the charging state. According to the method, the charging state of the vanadium cell can be detected on line, the imbalance can be known in real time, and thus a system can be adjusted when the vanadium cell is in an unideal state.

Description

technical field [0001] The invention belongs to the field of measurement technology, in particular to a method and device for detecting the charge state of a vanadium battery based on an angle spectrum surface plasmon resonance detection technology. Background technique [0002] Invented in the 1980s (J. Electrochem. Soc. 1986, 133:1057), the vanadium redox flow battery (VRB or vanadium battery for short) has the advantages of easy scale, long service life, Environmental friendliness and other advantages have attracted wide attention in the field of energy storage technology. [0003] In vanadium batteries, the working substances in the positive and negative electrodes are electrolytes containing vanadium ions. During the charging process, the +4 valence vanadium ions in the positive electrode are transformed into +5 valence vanadium ions, and the +3 valence vanadium ions in the negative electrode are transformed into +2 valence vanadium ions; the reverse is true during the...

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Problems solved by technology

[0005] The existing detection methods of the state of charge of vanadium batteries mainly include open circuit voltage method, potentiometric titration method, chromatography and spectrophotometer method, but none of them are suitable for real-time online detection of state of charge of vanadium battery: the open circuit voltage method cannot detect the unbalanced state vanadium battery; potentiometric titration and chromatographic steps are more complicated, and the detection time is long; it is difficult for spectrophotometer to detect high concentration (generally up to 2mol / L) electrolyte in vanadium battery (Journal of Power Sources 2011, 196: 8822 –8827)

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