Flow battery anode and cathode electrolyte migration control method
A liquid flow battery and control method technology, which is applied in the direction of fuel cells, electrolyte flow processing, fuel cell additives, etc., can solve the problems of increasing labor costs, time-consuming and laborious, etc., and achieve low cost, easy operation and maintenance, and simple operation methods Effect
Active Publication Date: 2019-12-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF15 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the commonly used liquid flow batteries still use the remixing method to reduce the volume migration of positive and negative electrodes in engineering, but the remixing method is time-consuming and laborious, which increases labor costs.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0045] In this embodiment, the all-vanadium redox flow battery system uses 1.7 mol / L vanadyl sulfate plus 3.0 mol / L sulfuric acid as the positive and negative electrolytes. First, add 1.7mol / L vanadyl sulfate to 3.0mol / L sulfuric acid, stir evenly, and prepare the original electrolyte; then, electrolyze the electrolyte to obtain positive and negative electrolyte samples corresponding to different SOCs; determine When the battery SOC operating range is 30% to 70%, the viscosity of the positive and negative electrolyte corresponding to 50% SOC is required, and the viscosity of the negative electrolyte is μ - =4.98mPa·s, the viscosity of the positive electrode electrolyte μ + = 4.08 mPa·s. Therefore, the viscosity ratio of the positive and negative electrolytes is 4 / 5, and the volume flow ratio of the positive and negative electrolytes can be set to 5 / 4. If the positive and negative electrolyte volume flow is 50mL min -1 , then the negative electrode electrolyte volume flow rat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the flow battery field and especially relates to a flow battery anode and cathode electrolyte migration control method. The method is characterized by using a Darcy law to construct a relationship between a volume migration rate of an anode and cathode electrolyte on two sides of a film and a pressure difference on two sides of the film; and then acquiring the relationshipbetween an anode and cathode porous medium pressure difference and a volume flow and viscosity of the electrolyte based on the Darcy law so that effective construction of the relationship among the volume flow of the anode and cathode electrolyte, the viscosity of the anode and cathode electrolyte and a volume migration rate of the electrolyte on the two sides of the film is realized. Based on that, a volume-flow ratio of the anode and cathode electrolyte is regulated and controlled through a viscosity value of the anode and cathode electrolyte so that migration of the electrolyte on the twosides of the film is effectively controlled. In the invention, a physicochemical property of the anode and cathode electrolyte and a rule of a porous medium are fully used, the migration rate of the electrolyte on the two sides of the film is effectively reduced under a condition that a complex design or equipment does not introduced, capacity attenuation of the flow battery is effectively controlled, and operation and maintenance cost of a flow battery system is greatly reduced.
Description
technical field [0001] The invention relates to the field of flow batteries, in particular to a method for controlling the migration of positive and negative electrolytes of a flow battery. Background technique [0002] Flow battery is one of the preferred technologies for large-scale grid-level energy storage. The capacity fading caused by the volume migration between the positive and negative electrolytes cannot be ignored. Reducing the volume migration between the positive and negative electrodes can effectively Improve the operating life of the flow battery and reduce the cycle cost. At present, the commonly used liquid flow batteries still use the remixing method to reduce the volume migration of positive and negative electrodes in engineering, but the remixing method is time-consuming and labor-intensive, which increases labor costs. [0003] The present invention firstly measures the change law of the viscosity of positive and negative electrolytes with a certain con...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H01M8/04276H01M8/04746H01M8/04992
CPCH01M8/04276H01M8/04992H01M8/04746Y02E60/50
Inventor 唐奡宋玉玺李享容严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI