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Bipolar plate for fuel cell stack and preparation method of bipolar plate

A fuel cell stack and bipolar plate technology, which is applied in fuel cells, circuits, electrical components, etc., can solve problems such as high cost, reduced air tightness, and defective plates, so as to improve the strength and toughness, and the surface is extremely Sexuality enhancement, the effect of improving wettability

Pending Publication Date: 2022-07-26
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the volume fraction of the conductive filler in the composite bipolar plate is more than 50%, and the conductivity is poor. However, when the content of the conductive filler is high, the mechanical properties of the bipolar plate are poor, and there are defects inside the plate, and the airtightness is reduced. meet normal needs
[0005] In the prior art, although carbon-based composite bipolar plates overcome the shortcomings of graphite bipolar plates such as poor mechanical properties, difficult processing, high cost, and poor corrosion resistance of metal bipolar plates, it is the focus of current research, but composite materials Poor conductivity of bipolar plates
When the content of conductive filler is high, the mechanical properties of the bipolar plate produced are poor, and there are defects inside the plate, and the airtightness is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The method for preparing a bipolar plate for a fuel cell stack of the present embodiment includes the aforementioned bipolar plate for a fuel cell stack, wherein the method for preparing a bipolar plate for a fuel cell stack is specifically carried out according to the following steps:

[0026] S1: First, dry the mixed expanded graphite matrix composite material at a temperature of 80°C to 100°C for 2 hours to remove acetone;

[0027] S2: add the above-mentioned composite material into the mold after adding the above-mentioned composite material to the ball mill for ball milling for 3h to 5h;

[0028] S3: Put the mold into the vacuum molding machine, and vacuumize for 40s to 60s after closing the mold, wherein the degree of vacuum is lower than -100kPa;

[0029] S4: The temperature is raised from room temperature to 80°C at 4°C-10°C, the molding pressure is 30MPa-100MPa, and the pressure is maintained for 30min-40min;

[0030] S5: the room temperature is raised to 120°...

Embodiment 1

[0039] The bipolar plate for the fuel cell stack in this embodiment is made of expanded graphite, carbon nanotubes, thermoplastic phenolic resin modified epoxy resin and m-phenylenediamine; in this embodiment, expanded graphite is the first conductive filler, and carbon nanotubes are For the second conductive filler, thermoplastic phenolic resin modified epoxy resin is used as adhesive, and m-phenylenediamine is used as curing agent.

[0040] The expansion coefficient of expanded graphite in this embodiment is 100ml / g~300ml / g, preferably, the length of carbon nanotubes is 10μm-20μm, and the mass ratio of expanded graphite to carbon nanotubes is 1:1.

[0041] The method for preparing a bipolar plate for a fuel cell stack of the present embodiment includes the aforementioned bipolar plate for a fuel cell stack, wherein the method for preparing a bipolar plate for a fuel cell stack is specifically carried out according to the following steps:

[0042] S1: First, the mixed expande...

Embodiment 2

[0055] The bipolar plate for the fuel cell stack in this embodiment is made of expanded graphite, carbon nanotubes, thermoplastic phenolic resin modified epoxy resin and m-phenylenediamine; in this embodiment, expanded graphite is the first conductive filler, and carbon nanotubes are For the second conductive filler, thermoplastic phenolic resin modified epoxy resin is used as adhesive, and m-phenylenediamine is used as curing agent.

[0056] The expansion coefficient of the expanded graphite in this implementation is 100ml / g~300ml / g, preferably, the length of the carbon nanotubes is 10μm-20μm, and the mass ratio of the expanded graphite to the carbon nanotubes is 5:1.

[0057] The method for preparing a bipolar plate for a fuel cell stack of the present embodiment includes the aforementioned bipolar plate for a fuel cell stack, wherein the method for preparing a bipolar plate for a fuel cell stack is specifically carried out according to the following steps:

[0058] S1: Firs...

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Abstract

The invention relates to the technical field of fuel cells, in particular to a bipolar plate for a fuel cell stack and a preparation method of the bipolar plate. The bipolar plate for the fuel cell stack is prepared from expanded graphite, carbon nanotubes, thermoplastic phenolic resin modified epoxy resin and m-phenylenediamine. Wherein the thermoplastic phenolic resin modified epoxy resin is an adhesive, the m-phenylenediamine is a curing agent, the expansion coefficient of the expanded graphite is 100-300 ml / g, the length of the carbon nanotube is 10-20 [mu] m, and the mass ratio of the expanded graphite to the carbon nanotube is (1-9): 1; according to the bipolar plate for the fuel cell stack, the thinning of the bipolar plate can be realized; the carbon nanotubes are added, so that the conductivity is improved, meanwhile, the content of hydroxyl groups after oxidation treatment is obviously increased, the surface polarity is enhanced, the wettability to organic matrix resin is improved, polar functional groups on the surfaces of the carbon nanotubes and a resin curing agent system can form chemical bonding through hydrogen-bond interaction, and the carbon nanotubes and the resin are firmly combined; good strength and toughness are realized.

Description

technical field [0001] The present invention relates to the technical field of fuel cells, in particular to a bipolar plate for a fuel cell stack and a preparation method thereof. Background technique [0002] The global energy industry is experiencing the third energy revolution in the direction of low carbon, no carbon and low pollution. Hydrogen energy will become an important medium for the third energy revolution, and the widespread use of hydrogen energy is an international trend. Proton exchange membrane fuel cell (PEMFC) can efficiently convert the chemical energy in hydrogen into electrical energy, which is not limited by the Carnot cycle, so the energy conversion efficiency is high, and its theoretical conversion efficiency can reach 85%–90%. %, the actual use efficiency is 2 to 3 times that of ordinary internal combustion engines, and it has high economic efficiency. It has attracted much attention because of its advantages of non-polluting, high efficiency, high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0223H01M8/0258B29C43/00B29C43/02
CPCH01M8/0223H01M8/0213H01M8/0258B29C43/02B29C43/003B29K2063/00B29K2061/04
Inventor 李位位李丽张小磊李笑晖甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD
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