Composite bipolar plate and its preparation method

A bipolar plate and particle size technology, applied in fuel cells, electrical components, electrochemical generators, etc., to achieve good electrical conductivity, high production efficiency, and good flow channel accuracy

Active Publication Date: 2022-05-31
氢辉能源(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a composite bipolar plate and its preparation method, aiming to solve the technical problem of how to improve the accuracy of the flow channel of the bipolar plate

Method used

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  • Composite bipolar plate and its preparation method
  • Composite bipolar plate and its preparation method
  • Composite bipolar plate and its preparation method

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preparation example Construction

[0050] A second aspect of the embodiments of the present application provides a method for preparing a composite bipolar plate, comprising the following steps:

[0051] S01: provide the raw material of the composite bipolar plate of the embodiment of the present application;

[0052] S02: Dissolve the toughening agent and the liquid epoxy resin in a solvent to obtain a mixed solution;

[0053] S03: Mix and process expanded graphite, flake graphite, graphite worms and conductive fillers to obtain a mixed material;

[0054] S04: after mixing the mixed solution and the mixed material, solvent removal treatment is performed, and then stamping molding and curing treatment are performed to obtain a composite bipolar plate.

[0055] In the preparation method of the composite bipolar plate provided in the embodiment of the present application, after mixing the raw materials uniformly, the product is obtained by stamping and curing. Such preparation method not only has high production...

Embodiment 1

[0065] A preparation method of a composite bipolar plate, comprising the following steps:

[0066] (1) Provide raw materials:

[0067] D50 particle size 25 microns ~ 200 microns expanded graphite powder 80 parts

[0068] D50 particle size 25 microns ~ 250 microns flake graphite powder 8 parts

[0069] 18 parts of graphite worms with an expansion ratio of 300mL / g

[0070] 30 parts of liquid epoxy resin

[0071] 1 part of carboxyl liquid nitrile rubber

[0072] 1 part of graphene conductive filler

[0073] 500 parts of dichloromethane solvent.

[0074] (2) Forming process: First dissolve the carboxyl-based liquid nitrile rubber and liquid epoxy resin in dichloromethane to obtain a mixed solution, then the expanded graphite, flake graphite, graphite worms and conductive fillers are vigorously mechanically stirred and mixed evenly, and finally the mixed solution is mixed. The solution and powder are mixed evenly, and the solvent is removed to obtain the base material of the ...

Embodiment 2

[0076] A preparation method of a composite bipolar plate, comprising the following steps:

[0077] (1) Provide raw materials:

[0078] D50 particle size 25 microns ~ 200 microns expanded graphite powder 74 parts

[0079] D50 particle size 25 microns ~ 250 microns flake graphite powder 6 parts

[0080] 15 parts of graphite worms with an expansion ratio of 200mL / g

[0081] 25 parts of liquid epoxy resin

[0082] Carboxyl liquid nitrile rubber 0.5 part

[0083] 0.5 part of graphene conductive filler

[0084] 450 parts of dichloromethane solvents.

[0085] (2) Forming process: First dissolve the carboxyl-based liquid nitrile rubber and liquid epoxy resin in dichloromethane to obtain a mixed solution, then the expanded graphite, flake graphite, graphite worms and conductive fillers are vigorously mechanically stirred and mixed evenly, and finally the mixed solution is mixed. The solution and powder are mixed evenly, and the solvent is removed to obtain the base material of th...

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Abstract

The present application relates to the technical field of hydrogen energy fuel cells, in particular to a composite bipolar plate and a preparation method thereof. The raw materials of the composite bipolar plate include the following components: 1-95 parts of expanded graphite with a D50 particle size of 1-300 μm; 0.1-50 parts of flake graphite with a D50 particle size of 1-500 μm; 1-95 parts of graphite worms; 1-50 parts of liquid resin; 0.1-20 parts of toughening agent; 0.1-20 parts of conductive filler. The composite bipolar plate has the best flow channel formability, precision, and comprehensive effects of mechanical properties and electrical conductivity, and has a good application prospect in solid electrolyte water electrolysis cells.

Description

technical field [0001] The application belongs to the technical field of hydrogen energy fuel cells, and in particular relates to a composite bipolar plate and a preparation method thereof. Background technique [0002] The hydrogen produced by solid electrolyte membrane water electrolysis technology has high purity, high electrolysis efficiency and compact electrolytic cell structure. It is considered to be a potential high-purity hydrogen production technology. The electrolytic cell is mainly composed of bipolar plates, gas diffusion layers and membrane electrodes. The bipolar plate is one of the key components of solid electrolyte water electrolysis, accounting for more than 40% of the cost of the electrolytic cell, and plays a number of functions such as isolation and distribution of cathode and anode reactants, current collection, heat conduction, sealing, and supporting membrane electrodes. Therefore, the bipolar plate material needs to have the characteristics of goo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M8/0234H01M8/0243H01M8/22
CPCH01M8/0234H01M8/0243H01M8/22Y02E60/50
Inventor张修平徐少轶樊建涛李辉
Owner氢辉能源(深圳)有限公司