Composite bipolar plate for all-vanadium redox flow battery and fabrication method of composite bipolar plate

An all-vanadium redox flow battery and bipolar plate technology, which is applied to fuel cells, regenerative fuel cells, circuits, etc., can solve the problem that the long-term stable operation of all-vanadium redox flow batteries cannot be satisfied, and the corrosion resistance and bending resistance of metal materials are poor. To achieve the effect of uniform and dense microscopic molecular structure, improved mechanical and electrical properties, and improved bending resistance

Inactive Publication Date: 2019-05-21
山东昇昀国际贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure graphite bipolar plates have good electrical conductivity and chemical stability, but they are easy to break during processing and installation, have poor bending resistance, resulting in thicker thickness, and higher processing costs, which are limited in large-scale applications
The metal material bipolar plate has high mechanical strength and toughness, good electrical and thermal conductivity, and the good machining performance of the metal material makes the flow field easy to process and shape, but the metal material has poor corrosion resistance and cannot meet the requirements of the all-vanadium liquid flow. The demand for long-term stable operation of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A composite bipolar plate for an all-vanadium redox flow battery is prepared, comprising the following steps:

[0027] (1) After the expandable graphite is expanded at a high temperature of 600° C., the worm-like graphite is formed.

[0028] (2) With the worm-shaped graphite prepared in step (1), at normal temperature, it is 10MPa to apply a pressure, and the pressing time is 4h after the first press molding is carried out by the continuous rolling of the molding machine, and the thickness is 0.6 mm, flexible graphite roll sheet with a tensile strength of 4Mpa.

[0029] (3) The polymer material PVDF softened at a softening temperature of 10°C higher than the melting point of the polymer material PVDF is used to coat the flexible graphite roll plate made in step (2) up and down. The total weight percentage of the graphite coil and the polymer material is 80%, and then the pressure is 9MPa applied to the hot press, and the hot pressing temperature is 10°C higher than the...

Embodiment 2

[0031] A composite bipolar plate for an all-vanadium redox flow battery is prepared, comprising the following steps:

[0032] (1) After the expandable graphite is expanded at a high temperature of 1000° C., the worm-like graphite is formed.

[0033] (2) the worm-shaped graphite prepared in the step (1), after being pressed and formed for the first time by the continuous rolling of the calender for 12 hours to apply a pressure of 25 MPa at normal temperature, the thickness of the made is 1.0 mm, flexible graphite roll sheet with a tensile strength of 8Mpa.

[0034] (3) The polymer material PE softened with a softening temperature of 30°C higher than the melting point of the polymer material PE is used to coat the flexible graphite roll sheet made in step (2) up and down. The total weight percentage of the graphite coil and the polymer material is 90%, and then the pressure is applied to the hot press at 12MPa, and the hot pressing temperature is 20°C higher than the melting po...

Embodiment 3

[0036] A composite bipolar plate for an all-vanadium redox flow battery is prepared, comprising the following steps:

[0037] (1) After the expandable graphite is expanded at a high temperature at an expansion temperature of 800°C, the worm-like graphite is formed;

[0038] (2) With the worm-like graphite obtained in step (1), at normal temperature, it is 12MPa to apply pressure, and the pressing time is 6h after carrying out the first compression molding by the continuous rolling of the molding machine, and the thickness is 0.8 mm, tensile strength of 10Mpa flexible graphite coil sheet.

[0039] (3) The polymer material PVDE softened at a softening temperature of 20°C higher than the melting point of the polymer material PVDE is used to coat the flexible graphite roll plate made in step (2) up and down, and the flexible graphite roll plate accounts for 20% of the flexible graphite roll plate. The total weight percentage of the graphite coil and the polymer material is 85%, a...

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Abstract

The invention relates to a composite bipolar plate for an all-vanadium redox flow battery and a fabrication method of the composite bipolar plate. By the composite bipolar plate, the technical problems that the composite bipolar plate for the all-vanadium redox flow battery in the prior art is difficult to process and is high in fabrication cost, poor in bending-resistant performance, poor corrosion-resistant performance, poor in conductivity and low in energy efficiency are solved. In the composite bipolar plate for the all-vanadium redox flow battery, provided by the invention, an inner layer of the composite bipolar plate is a flexible graphite roll plate, an outer layer is a high polymer material, the flexible graphite roll plate and the polymer material are hot-pressed and integrallyformed, and the flexible graphite roll plate is formed by pressing wormlike graphite which is formed by high-temperature expansion of expandable graphite. The composite bipolar plate is widely appliedto the technical field of an all-vanadium redox flow energy storage battery.

Description

technical field [0001] The invention relates to the technical field of all-vanadium redox flow energy storage batteries, in particular to a composite bipolar plate for all-vanadium redox flow batteries and a preparation method thereof. Background technique [0002] Electric energy is an indispensable secondary energy source for human life and production in modern society. With the development of social economy and the improvement of people's living standards, the demand for electricity is increasing day by day. Therefore, it is necessary to continuously develop various power stations and power transmission and distribution systems to meet the needs of life and production for power. In order to make full use of various power generation systems and achieve stable power supply, it is necessary to develop large-scale and efficient power storage technologies. So far, the flow energy storage batteries that have been studied more include: iron-chromium flow energy storage batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0221H01M8/0228H01M8/18
CPCY02E60/50
Inventor 李正坤李文涛
Owner 山东昇昀国际贸易有限公司
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