Method of compositely manufacturing proton exchange membrane fuel cell bipolar plate and membrane electrode assembly

A proton exchange membrane and membrane electrode assembly technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of high contact resistance of metal bipolar plates, easy rupture of gas diffusion layers, and inability to bend and form. Achieve the effect of reducing ohmic loss, reducing processing cost, and eliminating contact resistance

Active Publication Date: 2009-10-07
上海氢晨新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies in the prior art, to provide a composite manufacturing method of bipolar plates and membrane electrode assemblies for proton exchange membrane fuel cells, to solve the problems of traditional membrane electrode assemblies that cannot be bent and formed, high manufacturing costs, and gas diffusion layers during assembly and assembly. It is easy to break during use, and the contact resistance with the metal bipolar plate is relatively large, etc.

Method used

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  • Method of compositely manufacturing proton exchange membrane fuel cell bipolar plate and membrane electrode assembly

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Experimental program
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Embodiment 1

[0031] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0032]The double-layer stainless steel 316 fiber mesh is processed into a bipolar plate 1 by a stamping forming process. The formed electrode plate 1 is removed by an alkali washing-acid washing-water washing process to remove surface grease and oxide film. The pretreated bipolar plate 1 is first weighed, and then dipped in polytetrafluoroethylene emulsion with a concentration of 5% for several times for water-repellent treatment. Take out the soaked PTFE bipolar plate and dry it in the shade, then place it in an oven at a temperature of 330°C to 340°C and bake it to remove the surfactant contained in the PTFE emulsion impregnated in the fiber net, and at the same time make the Polytetrafluoroethylene is hot-melt and sintered and evenly dispersed on the fiber, so as to achieve a good water-repellent effect and build a gas channel that is conducive to gas transm...

Embodiment 2

[0037] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0038] The double-layer stainless steel 316 fiber mesh is processed into a bipolar plate 1 by a stamping forming process. The formed electrode plate 1 is removed by alkali washing-acid washing-water washing process to remove surface grease and oxide film. The pretreated bipolar plate 1 is first weighed, and then dipped in polytetrafluoroethylene emulsion with a concentration of 5% for several times for water-repellent treatment. Take out the soaked PTFE bipolar plate and dry it in the shade, then place it in an oven at a temperature of 330°C to 340°C and bake it to remove the surfactant contained in the PTFE emulsion impregnated in the fiber net, and at the same time make the Polytetrafluoroethylene is hot-melt and sintered and evenly dispersed on the fiber, so as to achieve a good water-repellent effect and build a gas channel that is conducive to gas transmis...

Embodiment 3

[0044] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0045] The double-layer stainless steel 316 fiber mesh is processed into a bipolar plate 1 by a stamping forming process. The formed electrode plate 1 is removed by alkali washing-acid washing-water washing process to remove surface grease and oxide film. The pretreated bipolar plate 1 is first weighed, and then dipped in polytetrafluoroethylene emulsion with a concentration of 5% for several times for water-repellent treatment. Take out the soaked PTFE bipolar plate and dry it in the shade, then place it in an oven at a temperature of 330°C to 340°C and bake it to remove the surfactant contained in the PTFE emulsion impregnated in the fiber net, and at the same time make the Polytetrafluoroethylene is hot-melt and sintered and evenly dispersed on the fiber, so as to achieve a good water-repellent effect and build a gas channel that is conducive to gas transmis...

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Abstract

The invention relates to a method of compositely manufacturing proton exchange membrane fuel cell bipolar plate and membrane electrode assembly in the technical field of fuel cell; the method comprises the steps of: first, using stamping process to process the double-layer stainless steel fiber net into the bipolar plate, second, using polyfluortetraethylene for executing hydrophobic treatment to the formed stainless steel fiber net bipolar plate, thereby forming hydrophobic reaction gas channel; third, coating a layer of carbon powder at surface of the bipolar plate after the hydrophobic treatment for leveling; fourth, applying the catalyst layer on the Nafion type proton exchange membrane to produce Pt / C catalyst layer; fifth, carrying out heat pressing treatment to the processed bipolar plate and the proton exchange membrane having catalyst layer to obtain the composite stainless steel fiber net bipolar plate and membrane electrode assembly. The component material of the invention has low producing cost and little ohmic loss and can be bent to satisfy the diverse design requirements of the stack structure.

Description

technical field [0001] The invention relates to a manufacturing method in the technical field of fuel cells, in particular to a composite manufacturing method of a proton exchange membrane fuel cell bipolar plate and a membrane electrode assembly. Background technique [0002] A fuel cell is a highly efficient and environmentally friendly power generation device, which directly converts the chemical energy stored in fuel and oxidant into electrical energy, and the theoretical thermoelectric conversion efficiency is 85% to 90%. Due to the advantages of low operating temperature, fast start-up, high reliability, no noise and emission pollution, proton exchange membrane fuel cells have broad application prospects in electric vehicles, small and medium-sized power stations and portable devices. [0003] Traditional proton exchange membrane fuel cell stacks are assembled in the way of filter presses, and most of them use internal shared pipelines. The main body of the battery pa...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/88H01M8/0245
CPCY02E60/50Y02P70/50
Inventor 彭林法易培云来新民倪军林忠钦
Owner 上海氢晨新能源科技有限公司
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