Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of bipolar plate for vanadium battery

A bipolar plate and vanadium battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of high local resistance, large resistance, and bipolar plates that cannot be made thin, so as to reduce production costs and simplify the preparation process Effect

Active Publication Date: 2020-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a method for preparing a bipolar plate for a vanadium battery, which solves the problem of uneven dispersion of carbon materials on the surface of the bipolar plate in the prior art, which causes too high a local resistance. The thickness direction of the plate cannot be made thin, and the resistance in the vertical direction is large, etc.

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of bipolar plate for vanadium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Place the steel plate in an incubator, control the temperature at 230°C, and stick a Teflon film on the surface of the steel plate, spray graphite powder with a particle size of 0.02mm on the steel plate, the coating thickness is 0.03mm, and then the particle size Spray 0.04mm polypropylene powder on the graphite layer with a coating thickness of 0.5mm. After 10 minutes, spray graphite powder with a particle size of 0.02mm on the polypropylene layer with a coating thickness of 0.03mm. When the temperature is below 40°C, it is taken out to make a bipolar plate for a vanadium battery.

[0027] The 2KW vanadium battery assembled with bipolar plates prepared in this example has the performance parameters of battery charging and discharging: Coulombic efficiency 95.5%, voltage efficiency 86.5%, and energy efficiency 82.6%.

Embodiment 2

[0029] Place the steel plate in an incubator, the temperature is controlled at 200°C, and a Teflon film is pasted on the surface of the steel plate, and carbon black powder with a particle size of 0.04mm is sprayed on the steel plate with a coating thickness of 0.04mm, and then the particle size is Spray polyethylene powder with a diameter of 0.06mm on the graphite layer with a coating thickness of 0.1mm. After 10 minutes, spray carbon black powder with a particle diameter of 0.04mm on the polyethylene layer with a coating thickness of 0.04mm. When the temperature drops below 40°C, it is taken out to make a bipolar plate for a vanadium battery.

[0030] The 2KW vanadium battery assembled with bipolar plates prepared in this example has the performance parameters of battery charging and discharging: 95.0% Coulombic efficiency, 86.0% voltage efficiency, and 81.7% energy efficiency.

Embodiment 3

[0032] Place the glass plate in an incubator, control the temperature at 180°C, and paste a Teflon film on the surface of the glass plate, spray graphite powder with a particle size of 0.03mm on the glass plate, and the coating thickness is 0.04mm, and then Spray polyvinyl chloride powder with a particle diameter of 0.04mm on the graphite layer with a coating thickness of 0.6mm. After 10 minutes, spray graphite powder with a particle diameter of 0.03mm on the polyvinyl chloride layer with a coating thickness of 0.04mm. mm, when the temperature drops below 40°C, take it out to make a bipolar plate for a vanadium battery.

[0033] The bipolar plate assembled 2KW vanadium battery prepared in this example has the performance parameters of battery charge and discharge as follows: Coulombic efficiency 96.5%, voltage efficiency 85.5%, energy efficiency 82.5%.

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

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of vanadium battery manufacturing, particularly to a preparation method of a bipolar plate for a vanadium battery. The preparation method comprises: spraying an electric conduction layer on a hot plate by using a thermal spraying method, spraying a resin layer on the electric conduction layer, curing, and spraying an electric conduction layer on the resin layer to prepare the bipolar late for the vanadium battery. According to the present invention, through the electric conduction layer used by the surface of the bipolar plate, the problems of too high resistance of the existing polymer-carbon black composite bipolar plate, the bipolar plate surface resistance increase caused by electrochemical corrosion, and the like can be solved; the thickness of the bipolar plate prepared through the current processes is more than 100 [mu]m, and cannot be reduced, and the thickness of the bipolar plate prepared through the method of the present invention can be less than 100 [mu]m, such that the defect of the distance of the electric conduction circuit of the bipolar plate in the vertical direction is long is solved; and the size of the bipolar plate preparedthrough the method of the present invention cannot be controlled, and can be any size, and conventional equipment such as an extruder, a hot press and the like are not required, such that the processis simple, and the processing cost is reduced.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular to a method for preparing a bipolar plate for a vanadium battery. Background technique [0002] Vanadium battery is an ideal energy storage battery for large-capacity energy storage of renewable energy such as wind energy and solar energy. In the research of all-vanadium redox flow battery, the performance index of the conductive bipolar plate plays an important role in the power output and cycle life of the vanadium battery stack, so the preparation of a new type of bipolar plate with good electrical conductivity and excellent mechanical properties is of great importance to the whole vanadium redox flow battery. It is of great significance that vanadium redox flow batteries have made breakthroughs and have been applied on a large scale. Although the bipolar plate research has achieved some results, there are still problems to be solved. The carbon material on the sur...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M8/0228
CPCH01M8/0228H01M8/188Y02E60/50
Inventor 侯绍宇张建国刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI