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Preparation method of flexible graphite composite bipolar plate of proton exchange membrane fuel cell

A technology of proton exchange membrane and flexible graphite, which is used in fuel cell parts, fuel cells, battery electrodes, etc., can solve problems such as large thickness, increase density, enhance gas tightness and mechanical strength, and reduce fine cracks and the effect of the probability of bubbles

Active Publication Date: 2009-06-03
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bipolar plate prepared by this process has good electrical conductivity, mechanical and sealing properties, but its thickness is relatively large, which has certain restrictions on the assembly and practical application of battery packs, especially for vehicles.

Method used

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  • Preparation method of flexible graphite composite bipolar plate of proton exchange membrane fuel cell
  • Preparation method of flexible graphite composite bipolar plate of proton exchange membrane fuel cell
  • Preparation method of flexible graphite composite bipolar plate of proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention adopts the attached figure 1 The preparation process shown. Select thickness as 7mm and density as 0.20g / cm 3 The flexible graphite sheet is pre-pressed under vacuum (vacuum degree-0.08MPa), the pre-pressing pressure is 1.5MPa, and the density is 0.69g / cm 3 of plates. Epoxy resin was selected as the polymer filler, phenolic resin was used as the curing agent, and ethanol was selected as the solvent to prepare a resin solution with a mass fraction of 40%. Vacuum impregnation (vacuum degree-0.08MPa) of the plate was carried out for 18 hours with the resin solution. After taking it out, use the post-treatment method of alcohol scrubbing to treat the resin remaining on the surface of the impregnated board, and dry it at 80°C for 2 hours. The dried plate is rolled out of the flow field flow channel by secondary rolling under vacuum conditions (vacuum degree -0.08MPa), and the rolling pressure is 10Mpa; finally, it is cured at 175°C by program heatin...

Embodiment 2

[0026] The difference from Example 1 is that a resin solution with a mass fraction of 20% is selected. The final thickness is 1mm and the density is 1.79g / cm 3 polymer / flexible graphite electrode composite plate.

[0027] The performance analysis of the prepared plate is as follows:

[0028] Table 2

[0029]

Embodiment 3

[0031] The difference from Example 1 is that a resin solution with a mass fraction of 23% is selected. The final thickness is 1mm and the density is 1.81g / cm 3 polymer / flexible graphite electrode composite plate. The performance analysis of the prepared plate is as follows:

[0032] table 3

[0033]

[0034] The bipolar plate prepared by using the composite material is assembled into a battery, and its performance is as follows: figure 2 shown.

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Abstract

The invention relates to a preparation method of a flexible graphite composite bipolar plate of a proton exchange membrane fuel cell, which comprises anode flow field, a cathode flow field and a water plate made of flexible graphite plates, which are assembled into a bipolar plate with a sealing frame and a partition plate. The method is that firstly low density flexible graphite plates are prepressed into plates with the density being of 0.65 to 0.75 g / cm<3> under vacuum, then the plates are dipped in low viscosity resin solution under vacuum, after surface treatment and drying, the plates are pressed through a roll or a die out the flow field, and a flow filed and a water plate made of polymer / flexible graphite composite plates is obtained after the plates are solidified. At last, the flow filed and the water plate made of the polymer / flexible graphite composite plates with the sealing frame and the partition plate are assembled into a bipolar plate. The preparation method has the advantages that the resin content in the pole plate is easier to be controlled, the sealing property to gas is good, the mechanical property is good, the thickness of the pole plate is convenient to be reduced, the preparation technology is simple, the mass production is easy, and the preparation method is significant for promoting the industrialized development of the fuel cell.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a preparation process for flexible graphite composite bipolar plates of proton exchange membrane fuel cells. Background technique [0002] The bipolar plate is a key component in the proton exchange membrane fuel cell (PEMFC). In the fuel cell, it plays the role of distributing fuel gas and air, realizing the electrical connection between monolithic cells, taking out waste heat from the active area, and preventing gas and coolant leakage as well as facilitating water management in the battery, among other functions. In addition, the cost of the bipolar plate accounts for about 30%-45% of the total cost of the battery, and its mass accounts for 80% of the total weight, so it also has a significant effect on the quality, volume and cost of the entire PEMFC system. It can be seen that if a low-cost, light-weight, and high-performance bipolar plate material can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/02H01M8/0258
CPCY02E60/50Y02P70/50
Inventor 杜超明平文傅云峰罗晓宽
Owner SUNRISE POWER CO LTD
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