Fuel cell graphitc composite flow field plate and its manufacturing method

A fuel cell, composite flow technology, applied in the direction of fuel cells, fuel cell components, battery electrodes, etc., can solve the problem of high contact resistance, high resistance of graphite/polymer flow field plates, and high contact resistance of flow field plates and diffusion layers and other problems, to achieve the effect of low contact resistance, low cost and good gas barrier performance

Inactive Publication Date: 2007-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the proportion of polymer in the composite material flow field plate is large, the injection molding process can be used, but due to the high polymer content, the bulk resistance of the graphite / polymer flow field plate is high, and the contact resistance with the diffusion layer is also high
When the proportion of graphite is large, the molding process can be used, but the polymer will be enriched on the surface of the flow field plate during the hot pressing process, and the flow field plate and the diffusion layer prepared by this method have high contact resistance

Method used

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  • Fuel cell graphitc composite flow field plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 0.14 g of phenolic resin containing 0.014 g of curing agent hexamethylenetetramine and 1.66 g of natural flake graphite into a high-speed universal pulverizer and mix evenly. Put the uniformly mixed powder into a flat mold and heat it to 90°C, pressurize it to 50MPa, hold it for 2 minutes, and then cool it down to 40°C to demould to obtain a prefabricated plate with a thickness of 2.1mm in the middle layer of the graphite composite flow field plate . Add a piece of flexible graphite paper with a thickness of 0.22mm equal to the surface area of ​​the prefabricated plate on both sides of the prefabricated plate in the middle layer, put them together into a mold with a flow channel and heat to 150°C, keep the temperature for 2 minutes, at 110MPa The thickness of the graphite composite flow field plate is 2.48mm obtained by pressing down. The two surfaces of the graphite composite flow field plate are respectively composed of 10 ridges and 10 grooves, the width of the ...

Embodiment 2

[0014] Put 0.6 g of phenolic resin containing 0.06 g of curing agent hexamethylenetetramine and 2.2 g of natural flake graphite into a high-speed universal pulverizer and mix evenly. Put the uniformly mixed powder into a flat mold and heat it to 90°C, pressurize it to 50MPa, keep it for 2 minutes, and then cool it down to 40°C to demould to obtain a prefabricated plate with a thickness of 2.4mm in the middle layer of the graphite composite flow field plate . Put a layer of expanded graphite particles with a mass of 0.05g on the bottom layer of the mold with runners, then place the prefabricated plate on the expanded graphite particles, and then place a layer of expanded graphite particles with a mass of 0.05g on the prefabricated plate . Heat the mold to 150°C, keep the temperature constant for 2 minutes, press and form at 70MPa to obtain a graphite composite flow field plate with a thickness of 2.1mm. The two surfaces of the graphite composite flow field plate are respectiv...

Embodiment 3

[0016] Put 0.28g of polypropylene and 2.52g of natural flake graphite into a high-speed universal pulverizer and mix evenly. Put the evenly mixed powder into a flat mold and heat to 175°C, pressurize to 50MPa, keep it for 3 minutes, and cool to The mold was demolded at 60° C. to obtain a prefabricated plate with a thickness of 2.2 mm in the middle layer of the graphite composite flow field plate. Add a piece of flexible graphite paper on both sides of the prefabricated plate in the middle layer, which is equal to the surface area of ​​the prefabricated plate, and the thickness is 0.3mm. Put it into a mold with a flow channel and heat it to 210°C, keep the temperature for 5 minutes, and press it at 100MPa to obtain graphite. The thickness of the composite flow field plate is 2.6mm. The two surfaces of the graphite composite flow field plate are respectively composed of 10 ridges and 10 grooves, the width of the ridges is 1 mm, the width of the grooves is 1 mm, and the depth of ...

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Abstract

This invention discloses a graphite compound flow field board for fuel cell and manufacture method. On the wall of the flow field board there are fluid inlet, the fluid outlet and rib and channel forming flow field. The flow field is characterized in that it is formed by middle layer of graphite composite material and upper and lower surface layers of flexible graphite material that are compounded by sandwich layer. The preparation process includes: mix evenly electric conductive pellets and resin or polymer, put it in the mold to heat up, pressurize and maintain a certain time, the cool to draw mould to obtain sandwiched composite plate. Advantages: lower contact resistance, strong anti-corrosion ability, good electric conductivity and thermal conductivity, good gas barrier property, simple process and low cost.

Description

technical field [0001] The invention relates to a material of a fuel cell flow field plate and a manufacturing method thereof, belonging to the technical field of fuel cells. Background technique [0002] A fuel cell (PEMFC) is a power generating device that converts chemical energy in fuel and oxidant directly into electrical energy. It has the advantages of high energy conversion rate, strong reliability, high mass-to-energy ratio, clean and easy to start, etc. [0003] Currently, the flow field plate materials used in fuel cells mainly include metal and graphite. The metal flow field plate has good electrical conductivity, heat conduction and gas barrier properties, and good machining performance makes the flow field processing process simple. The disadvantage is that the cathode is easy to produce oxide film, which leads to an increase in the contact resistance with the diffusion layer and reduces the performance of the battery; the anode is easily corroded, and the pr...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0297
CPCY02E60/50Y02P70/50
Inventor 王宇新李冬杰许莉
Owner TIANJIN UNIV
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