Method and device for detecting charging state of vanadium redox battery

Abstract

The invention discloses a method for detecting charging state of a vanadium redox battery, which includes the following steps of firstly, detecting electrolyte of the vanadium redox battery by a spectral type surface plasma resonance sensor to obtain surface plasma resonance spectral information of the electrolyte and computing surface plasma resonance wavelength and/or refractive index of the electrolyte; and secondly, inquiring or computing charging state of the vanadium redox battery by a prebuilt database of relation between the surface plasma resonance wavelength and/or refractive index of the electrolyte with various parameters and the charging state. The method can detect the charging state of the vanadium redox battery online, can acquire imbalance degree in real time and can adjust the system when the vanadium redox battery is not at the perfect state.

Description

technical field [0001] The invention belongs to the field of measurement technology, in particular to a method and device for detecting the state of charge of a vanadium battery based on a spectral 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 dis...

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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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