Pile structure of redox flow battery

A technology of liquid flow batteries and battery stacks, which is applied to battery electrodes, fuel cell components, fuel cells, etc., can solve the problems of polarization voltage hydrogen and oxygen evolution, slow diffusion, electrode reaction dead zone, etc., to increase the interface Effect of area, flow uniformity, speed promotion

Inactive Publication Date: 2010-06-02
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Abstract
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Problems solved by technology

However, the active substance in the electrolyte diffuses slowly inside the porous electrode, especially for a large-area porous electrode. Due to the inconsistent resistance of the solution everywhere, it is easy to form a "channel flow" inside the porous electrode, forming a dead zone for electrode reaction. , causing the local polarization voltage to be too high and side reactions such as hydrogen evolution and oxygen evolution to occur

Method used

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  • Pile structure of redox flow battery
  • Pile structure of redox flow battery
  • Pile structure of redox flow battery

Examples

Experimental program
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Embodiment

[0017] The electrode active material of the vanadium redox battery is vanadium-containing sulfuric acid solution, and the positive electrode electrolyte is V-containing 4+ / V 5+ The sulfuric acid solution of the redox pair, the negative electrode electrolyte is containing V 2+ / V 3+ Redox couple in sulfuric acid solution.

[0018] The reaction principle of vanadium battery is as follows:

[0019] positive electrode:

[0020] negative electrode:

[0021] Design and assemble two batteries, the current collector plate is a 1mm conductive electrode plate, the effective electrode area is 500*300mm, a set of composite flow field plates (interdigitated flow field), the actual reaction electrode area after removing the flow field plate is 1250cm 2 , and the other group is a plate electrode without a flow field plate. The positive and negative electrolytes are 1.6mol / L V in 1000ml 4+ +3mol / L H 2 SO 4 and 1.6mol / L V in 1000ml 3+ +3mol / L H 2 SO 4 solution, the porous ele...

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Abstract

The invention discloses a pile structure of a redox flow battery for storing energy through chemical reaction, which has the characteristic of improving the flowing uniformity of electrolyte. The pile structure of the redox flow battery comprises a battery stack formed by a plurality of single battery connected in series; each single battery comprises a positive pole sealing frame and a negative pole sealing frame; a collector plate which has a porous electrode and a conductive double electrode is arranged in the positive pole sealing frame; and flow field plates dividing the porous electrode into a plurality of flow guide areas are arranged in the porous electrode. The arranged flow field plates make the electrolyte flow in the porous electrode according to the flow guide areas separated by the flow field plates, increase the area of an electrochemical reaction interface and the flow speed at which the electrolyte passes through the porous electrode, make the flow of the electrolyte in the porous electrode more uniform, accelerate the electrochemical redox reaction, improve the current density of an electrochemical flow battery and obviously improve the efficiency of the conversion and storage of the electric energy and chemical energy in the electrochemical flow battery.

Description

technical field [0001] The invention relates to a stack structure, in particular to a stack structure of a redox flow battery for storing electric energy through chemical reactions. Background technique [0002] At present, liquid flow energy storage battery is a kind of device suitable for large-scale power storage. It is a battery stack formed by connecting multiple single cells in series. , a positive electrode, an ion exchange membrane, a negative electrode, a negative sealing frame and a collector plate located in the negative sealing frame. It has the advantages of long cycle life, independent design of capacity and power, high reliability, no geographical restrictions, and short construction period. Compared with other chemical energy storage devices such as batteries and supercapacitors, it is very cost-effective and safe. . Liquid flow batteries have great potential in matching energy storage for wind energy and solar power generation, and have attracted more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/24H01M8/18H01M4/86H01M8/02H01M8/0258H01M8/2455
CPCY02E60/528Y02E60/50
Inventor 冉洪波张波吴建国罗冬梅李道玉彭宏亮毛凤娇廖长轩李伟
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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