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Method for preparation of flexible graphite material for fuel cell with groove plate on both sides

A technology of flexible graphite materials and fuel cells, which is applied to fuel cell components, fuel cells, battery electrodes, etc., can solve the problems of brittle flexible graphite plates and achieve high density, good material fluidity, and good plasticity

Active Publication Date: 2009-03-11
中钛国创(青岛)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the flexible graphite plate is brittle when the density is high, the purpose of the present invention is to provide a method for manufacturing a flexible graphite material with grooves on both sides of the fuel cell with high density and good plasticity.

Method used

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  • Method for preparation of flexible graphite material for fuel cell with groove plate on both sides
  • Method for preparation of flexible graphite material for fuel cell with groove plate on both sides
  • Method for preparation of flexible graphite material for fuel cell with groove plate on both sides

Examples

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Embodiment 1

[0027] The preparation process of expanded graphite plate is: use natural flake graphite as raw material, use concentrated sulfuric acid (concentration 98%) as intercalation agent, concentrated nitric acid as oxidizing agent, wash with water to generate graphite residual compound, i.e. expandable graphite; wherein the concentrated sulfuric acid and oxidizing agent The weight ratio is 90:10; the weight ratio of natural flake graphite to concentrated sulfuric acid is 1:3; the expandable graphite is expanded into expanded graphite powder through an expansion furnace above 800°C, and the expansion volume reaches 200ml / g, and the expanded graphite powder is rolled Formed into low density board.

[0028] Manufacture of flexible graphite material for fuel cells with grooves on both sides: expandable graphite with an expansion volume of 200ml / g is expanded in an expansion furnace at about 800°C, and the expanded graphite powder is rolled to make a thickness of 5.5mm and a density of 0...

Embodiment 2

[0036] The difference from Example 1 is that

[0037] The preparation process of expanded graphite plate is as follows: use natural flake graphite as raw material, use concentrated sulfuric acid (concentration 98%) as intercalation agent, potassium chlorate, etc. The weight ratio is 95:5; the weight ratio of natural flake graphite to concentrated sulfuric acid is 1:3; the expandable graphite is expanded into expanded graphite powder through an expansion furnace above 1000°C, and the expansion volume reaches 400ml / g, and the expanded graphite powder is rolled Formed into low density board.

[0038] Manufacture of flexible graphite material for fuel cells with grooves on both sides: expandable graphite with an expansion volume of 400ml / g is expanded in an expansion furnace at about 1000°C, and the expanded graphite powder is rolled to make a thickness of 5.5mm and a density of 0.3g / cm 3 , Expanded graphite plate with a width of 500mm and a length of 500mm, cut this graphite pl...

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Abstract

This invention relates to a proton exchange membrane fuel cell plate, specifically, a manufacturing method of the flexible graphite material both-side trench plate used for fuel cell, 1) place the expanded graphite plate into dipping tank, vacuum impregnation, joining epoxy resin solution, the weight of the plate increased by 15-50%; drying the dipped plate in the 80~100degreeC; 2) once again place the epoxy resin drying plate into the dipping tank, vacuumed impregnation, then joining phenolic resin solution, the weight of the plate increased by 10-30%, drying the dipped plate in the 80~100degreeC; 3) then repress the drying plate with the plate repression machine, and place the repressed graphite plate on the both-side trench metal mold, pressing to form the shape, the pole plate of both surface having trench; 4) the formed plate processing ascending temperature and heat treatment to solid the resin. The advantages of the invention are: the pole plate having good plastic before molding, and material having good fluidity, and easy to mold for double-sided trench fuel cell pole plate.

Description

technical field [0001] The invention relates to a pole plate for a proton exchange membrane fuel cell, which is a method for plasticizing and forming a thin flexible graphite pole plate with grooves on both sides for a fuel cell, specifically a flexible graphite material with two sides for a fuel cell A method of manufacturing a grooved pole plate. Background technique [0002] A proton exchange membrane fuel cell is a device that uses hydrogen, methanol, etc. as a fuel, and air (oxygen) as an oxidant to perform an electrochemical reaction to directly generate electrical energy. The voltage of a single battery is generally 0.3-1.0V, which is very low, so in practical applications, dozens to hundreds of single batteries are used in series. The single cells are connected in series with bipolar plates to supply the fuel and oxidant of the single cells and separate the fuel and oxidant. The bipolar plate also has a cooling channel, and the coolant must be separated from the fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/02C01B31/02H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 付云峰阳贻华侯中军徐乃涛
Owner 中钛国创(青岛)科技有限公司
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