A kind of all-vanadium redox flow battery positive and negative electrode electrolyte leveling blending system and method thereof

Abstract

The invention discloses a leveling and blending system and method for the positive and negative electrolytes of an all-vanadium redox flow battery. The leveling and blending system includes a positive electrode liquid storage tank, a negative electrode liquid storage tank, an electric stack, and a positive electrode liquid storage tank. Connect with the stack and deliver the positive electrolyte to the stack, the negative liquid storage tank is connected to the stack and transport the negative electrolyte to the stack; the stack is connected to the positive liquid storage tank and the negative liquid storage through the fifth pipeline and the sixth pipeline respectively tank connection; the positive liquid storage tank is connected with the blending pipe through the third branch pipe opened on the first pipe, and the negative liquid storage tank is connected with the blending pipe through the fourth branch pipe opened on the second pipe, and the blending pipes are respectively It is connected with the positive electrode liquid storage tank and the negative electrode liquid storage tank through the seventh pipeline and the eighth pipeline. The leveling and blending system and the method thereof provided by the present invention avoid long-term contact of the positive and negative electrolytes, thereby reducing the loss of self-discharge capacity, realizing the capacity recovery of the system, and ensuring that the capacity of the electrolyte does not decay.

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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