Leveling and blending system and method for positive and negative electrolytes of all-vanadium redox flow battery

Abstract

The invention discloses a leveling and blending system and method for positive and negative electrolytes of an all-vanadium redox flow battery. The leveling and blending system comprises a positive liquid storage tank, a negative liquid storage tank and an electric pile. The positive liquid storage tank is connected with the electric pile and conveys a positive electrolyte to the pile; and the negative storage tank is connected to the electric pile and conveys a negative electrolyte to the pile. The electric pile is connected with the positive liquid storage tank and the negative liquid storage tank through a fifth pipeline and a sixth pipeline. The positive liquid storage tank is connected with a blending pipe through a branch third pipe opened at the first pipeline; the negative liquid storage tank is connected with the blending pipe through a branch fourth pipe opened at the second pipeline; and the blending pipe is connected with the positive liquid storage tank and the negative liquid storage tank through a seventh pipeline and an eighth pipeline. According to the leveling and blending system and method, long-time contact between the positive and negative electrolytes is avoided to reduce self-discharge capacity losses and realize the capacity recovery of the system; and the attenuation of the electrolyte capacity is prevented.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, in particular to a leveling and blending system and method for the positive and negative electrolytes of the all-vanadium redox flow battery. Background technique [0002] The all-vanadium redox flow battery is a new type of energy storage battery with relatively young technology, especially suitable for the application of large-capacity energy storage. 2+ / VO 2+ , Negative pole V 2+ / V 3+ The positive and negative electrolytes are stored in storage tanks respectively, and the positive and negative electrolytes are provided to the battery module separately through an external pump. The positive and negative electrolytes are separated by a diaphragm inside the battery, and return to the storage tanks after redox reactions occur. Such a continuous cycle completes the mutual conversion of electrical energy and chemical energy. [0003] In actual operation, the penetration of vanadium ions an...

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Problems solved by technology

[0007] In order to solve the problems that the existing electrolyte leveling and blending system has no obvious adjustment effect on the concentration and will cause leakage, resulting in a decrease in the overall efficiency and capacity of the system, the invention provides an electrolytic solution for the positive and negative electrodes of the all-vanadium redox flow battery. Liquid leveling blending system and method thereof

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