Flow field structure of fuel cell or redox flow cell pole plate

A liquid flow battery and fuel cell technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of poor battery uniformity and uneven distribution of reactants on the electrode surface, achieve uniform heat production, avoid the formation of pinholes and change the mechanical structure , Improve the uniformity and operating life of the effect

Inactive Publication Date: 2019-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is improved to solve the problem of uneven distribution of reactants on the electrode surface due to the continuous consumption of reactants during the flow process of the fuel cell / redox flow battery, which leads to poor uniformity in the battery discharge process. flow field structure

Method used

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  • Flow field structure of fuel cell or redox flow cell pole plate
  • Flow field structure of fuel cell or redox flow cell pole plate
  • Flow field structure of fuel cell or redox flow cell pole plate

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Experimental program
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Effect test

specific Embodiment approach

[0030] Specific implementation methods include:

[0031] Bipolar plate 1, used for fluid distribution and heat transfer oil circulation; Membrane electrode assembly 2, the component unit of the fuel cell stack;

[0032] working principle:

[0033] A fuel cell is a device that converts chemical energy stored in compound fuels directly into electrical energy through a chemical reaction. A proton exchange membrane fuel cell usually consists of an anode, a cathode and a proton exchange membrane. During the operation of the battery, the fuel undergoes an oxidation reaction on the surface of the anode catalyst to generate protons and electrons. The protons reach the cathode through the proton exchange membrane, oxygen undergoes a reduction reaction with the protons on the surface of the cathode catalyst to generate water, and the electrons do work through the external circuit to reach the cathode. The redox flow battery is a new type of large-scale electrochemical energy storage d...

Embodiment approach 1

[0036] Embodiment 1: The anode of the bipolar plate 1 adopts a conventional serpentine structure, and the cathode flow field structure adopts a counterflow serpentine structure to test the performance of the DMFC battery. The electrode with an effective area of ​​50 square centimeters in the membrane electrode assembly 2 is selected to verify the structure of the bipolar plate . The battery discharge process uses 100mA cm -2 Electricity density discharge test is carried out, the anode uses 0.5M methanol solution, the cathode uses air feed, and the cathode and anode are fed with 3 times the metering ratio of feed. The battery operation shows excellent stability, and the 300-hour battery stability test results show that the stability of the battery during operation is better than that of the conventional flow field structure.

Embodiment approach 2

[0037] Embodiment 2: The anode of the bipolar plate 1 adopts a conventional serpentine structure, and the cathode flow field structure adopts a countercurrent parallel structure to test the performance of the DMFC battery. The electrode with an effective area of ​​50 square centimeters in the membrane electrode assembly 2 is selected to verify the structure of the bipolar plate. The battery discharge process uses 200mA cm -2 Electricity density discharge test is carried out, the anode uses 0.5M methanol solution, the cathode uses air feed, and the cathode and anode are fed with 3 times the metering ratio of feed. The battery operation shows excellent stability, and the 200-hour battery stability test results show that the stability of the battery during operation is better than that of the conventional flow field structure.

[0038] This embodiment can effectively solve the problem of uneven distribution of fluid in the fuel cell / redox flow battery. The fluids in the flow cha...

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Abstract

The invention discloses a flow field structure of a fuel cell or redox flow cell pole plate. A proton exchange membrane cell comprises two end plates and a unit cell arranged between two end plates; the unit cell comprises a bipolar plate and a membrane electrode; the bipolar plate comprises an anode flow field structure and a cathode flow field structure; the redox flow cell comprises two end plates and a unit cell set arranged between two end plates; the unit cell set comprises an electrode material, a diaphragm and the bipolar plate; the bipolar plate comprises a positive flow field structure and a negative flow field structure. Compared with the conventional flow field structure, the flow field structure can enable the fluid distribution of the cathode and anode to be more uniform, thereby enabling the reflection in the electrode to be more uniform.

Description

technical field [0001] The invention relates to the technical field of fuel cells / redox flow batteries, in particular to a fluid flow and distribution structure. Background technique [0002] A fuel cell is a device that converts chemical energy stored in compound fuels directly into electrical energy through a chemical reaction. A proton exchange membrane fuel cell usually consists of an anode, a cathode and a proton exchange membrane. During the operation of the battery, the fuel undergoes an oxidation reaction on the surface of the anode catalyst to generate protons and electrons. The protons reach the cathode through the proton exchange membrane, oxygen undergoes a reduction reaction with the protons on the surface of the cathode catalyst to generate water, and the electrons do work through the external circuit to reach the cathode. The redox flow battery is a new type of large-scale electrochemical energy storage device. Its positive and negative electrolytes are store...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 孙公权孙雪敬孙海
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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