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A fuel cell bipolar plate and its preparation method

A fuel cell and bipolar plate technology, applied in the direction of fuel cells, fuel cell parts, circuits, etc., can solve the problems of limited polymer materials, and achieve the effects of low production cost, simple operation, and short preparation time

Active Publication Date: 2022-04-15
SHENZHEN SENERGY FUEL CELL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3D printing technology includes solidification technology, layered entity manufacturing technology, selective laser sintering technology and fused deposition modeling technology. Among them, selective laser sintering technology has the advantages of wide applicability and simple manufacturing process, but selective laser sintering technology is available Sintered polymer materials are very limited

Method used

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  • A fuel cell bipolar plate and its preparation method

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preparation example Construction

[0042] On the other hand, the embodiment of the present invention also provides a method for preparing the fuel cell bipolar plate, comprising the following steps:

[0043] Step S01: Mix graphite and resin powder under vacuum, stir evenly at 40°C-50°C to obtain a semi-finished product; based on 100 parts by mass of the semi-finished product, the mass part of the graphite is 97-98 parts , the mass fraction of the resin powder is 2 to 3 parts;

[0044] Step S02: heating the semi-finished product in step S01 to 80-150°C, and continuing to react for 5-10 minutes to obtain a paste;

[0045] Step S03: Lower the paste in step S02 to room temperature, and then perform 3D printing on the paste at 30-90°C according to the drawing of the first plate (selective laser sintering technology is used in the examples of this application) 3D printing), obtain the first polar plate;

[0046] Step S04: Cool down the paste in step S02 to room temperature, and then perform 3D printing on the paste...

Embodiment 1

[0063] A method for preparing a fuel cell bipolar plate, comprising the steps of:

[0064] Step S01: Mix expanded graphite and resin powder under vacuum, stir at 40°C for 30 minutes until uniform, and obtain a semi-finished product; based on 100 parts by mass of the semi-finished product, 98 parts by mass of the expanded graphite, The mass fraction of the resin powder is 2 parts;

[0065] Step S02: heating the semi-finished product in step S01 to 100°C, and continuing to react for 5 minutes to obtain a paste;

[0066] Step S03: Cool down the paste in step S02 to room temperature, and then perform 3D printing on the paste at 45°C according to the drawing of the first polar plate to obtain the first polar plate;

[0067] Step S04: Cool down the paste in step S02 to room temperature, and then perform 3D printing on the paste at 45°C according to the drawing of the second polar plate to obtain a second polar plate (with a density of 0.50-0.70g / cm 3 );

[0068] Step S05: bondi...

Embodiment 2

[0073] A method for preparing a fuel cell bipolar plate, comprising the steps of:

[0074] Step S01: Mix natural graphite and resin powder under vacuum, stir at 50°C for 30 minutes until uniform, and obtain a semi-finished product; based on 100 parts by mass of the semi-finished product, the mass part of the natural graphite is 97 parts, The mass fraction of described resin powder is 3 parts;

[0075] Step S02: heating the semi-finished product in step S01 to 110°C, and continuing to react for 10 minutes to obtain a paste;

[0076] Step S03: Cool down the paste in step S02 to room temperature, and then perform 3D printing on the paste according to the drawing of the first polar plate at 30-90° C. to obtain the first polar plate.

[0077] Step S04: Cool down the paste in step S02 to room temperature, and then perform 3D printing on the paste at 45°C according to the drawing of the second polar plate to obtain a second polar plate;

[0078] Step S05: bonding the first pole pla...

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Abstract

The application relates to a fuel cell bipolar plate and a preparation method thereof, belonging to the technical field of fuel cells. The fuel cell bipolar plate has a double-layer structure, and the double-layer structure includes a first polar plate and a second polar plate that are in contact with each other, and a three-dimensional flow is formed between the first polar plate and the second polar plate. field, the width of the flow channel of the three-dimensional flow field is 0.3 mm to 0.8 mm; the first pole plate is a graphite plate or graphite flat plate with a two-dimensional flow field, and the second pole plate is a porous carbon foam plate. The preparation method of the present application is simple to operate, low in production cost, and short in preparation time. The paste of the present application can be applied to selective laser sintering technology for 3D printing, and can quickly prepare the required fuel cell bipolar plate according to actual needs. The prepared bipolar plate has good flexibility, excellent mechanical properties and electrical properties, and can meet the requirements of fuel cell bipolar plates.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell bipolar plate and a preparation method thereof. Background technique [0002] The fuel cell bipolar plate (Bipolar Plate, BP), also known as the flow field plate, is the "skeleton" in the stack. It is stacked with the membrane electrode to form a stack, which supports the fuel cell, collects current, and provides cooling fluid. channel, separating oxidizing and reducing agents, etc. [0003] Generally speaking, in terms of functionality, the bipolar plate material is required to be a good conductor of electricity and heat, with a certain strength and gas density, etc.; in terms of stability, the bipolar plate is required to be in the acidity (pH=2~3) and potential ( E=~1.1V), hot and humid (air-water two-phase flow, ~80°C) environment has corrosion resistance and is compatible with other fuel cell components and materials without pollution; in terms of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/026H01M8/0245H01M8/0234B33Y10/00
CPCH01M8/026H01M8/0234H01M8/0245B33Y10/00Y02E60/50
Inventor 高鹏然张华农
Owner SHENZHEN SENERGY FUEL CELL TECH CO LTD