Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof

A technology of expanded graphite and fuel cells, which is applied in the field of electrochemical cells, can solve problems such as uneven gas distribution in the battery pack, water accumulation, and MEA flooding, so as to reduce MEA flooding, reduce water management pressure, and improve The effect of utilization

Inactive Publication Date: 2012-07-04
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the fuel cell is a complex chemical reaction process when it is working, there are problems of heat balance and water balance, and the water management in the operation of the fuel cell is a problem that is difficult to control
When the amount of water in the reaction gas is slightly less (low relative humidity), the proton exchange membrane will dry out and the resistance will increase, making the electromigration of protons difficult and deteriorating the performance of the fuel cell
If the amount of water is too much, it is easy to form water accumulation in the diversion tank, blocking the passage of the reaction gas, resulting in uneven distribution of gas in the battery pack, affecting the performance of the battery, and in severe cases, it will cause the MEA to flood and the battery to fail.

Method used

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  • Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof
  • Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof
  • Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 20 sheets of porous expanded graphite material 1 with a thickness of 3 mm into the sealed tank for vacuuming, when the vacuum degree in the sealed tank reaches 10 -2 Stop vacuuming during pa, suck the polytetrafluoroethylene suspension (solvent is water) that concentration is 1% in the sealed box that expanded graphite material 1 is housed, make expanded graphite material 1 soak wherein 10min; The graphite material 1 is taken out, and the resin on the surface of the expanded graphite material 1 is absorbed by absorbent paper, and cured at 340°C to 360°C for 3 hours. Form a layer of filling layer I201 (such as figure 1 shown), forming a layer of hydrophobic network. Show by test, the massfraction of the polytetrafluoroethylene resin that contains in the expanded graphite material 1 after processing is 2.6%; In hydrophobic test, the contact angle of expanded graphite material 1 surface after filling is 99.6 (as image 3 shown, where A is a water droplet). 20 sheets...

Embodiment 2

[0035] Put 20 sheets of porous expanded graphite material 1 with a thickness of 3 mm into the sealed tank for vacuuming, when the vacuum degree in the sealed tank reaches 10 -2 Stop vacuuming during pa, suck the polytetrafluoroethylene suspension (solvent is water) that concentration is 1% in the sealed box that expanded graphite material 1 is housed, make expanded graphite material 1 soak wherein 10min; The graphite material 1 is taken out, and the liquid on the surface of the expanded graphite material 1 is sucked away by absorbent paper, and cured at 340°C to 360°C for 3 hours. After curing, the immersed polytetrafluoroethylene is fixed with the expanded graphite material 1, thereby Form a layer of filling layer I201 (such as figure 1 As shown), that is, a hydrophobic network is formed; then the expanded graphite material 1 after the above treatment is put back into the sealed tank for vacuum treatment, and when the vacuum degree in the sealed tank reaches 10 -2 Stop vacuu...

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Abstract

The invention discloses a hydrophobization fuel cell expanded graphite flow field and a manufacturing method thereof. The hydrophobization fuel cell expanded graphite flow field is manufactured by a porous expanded graphite material, and is characterized in that holes of the expanded graphite material are provided with hydrophobic fillers, and the upper surfaces of the hydrophobic fillers and the surface of the expanded graphite material are arranged on the same horizontal plane. The hydrophobization fuel cell expanded graphite flow field disclosed by the invention is manufactured simply, has a hydrophobization function, prompts drainage of liquid water during running of a cell and prevents MEA (Membrane Electrode Assembly) from being flooded during the running of the cell; and by utilizing the hydrophobization fuel cell expanded graphite flow field manufactured by the method disclosed by the invention, water management pressure can be effectively reduced and utilization ratio of reaction gas is improved during the running of the fuel cell.

Description

technical field [0001] The invention relates to the field of electrochemical cells, in particular to a hydrophobic fuel cell expanded graphite flow field and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy through an electrocatalytic reaction on electrodes. It is not limited by the Carnot cycle and can efficiently convert chemical energy into electricity. Proton Exchange Membrane Fuel Cell (PEMFC for short) is the most useful power source for future electric vehicles due to its low-temperature start-up, simple structure, and convenient operation. [0003] Since the fuel cell is a complex chemical reaction process, there are problems of heat balance and water balance, and the water management in the operation of the fuel cell is a problem that is difficult to control. When the amount of water in the reaction gas is slightly less (low relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88
CPCY02E60/50Y02P70/50
Inventor 燕希强徐乃涛单金环侯中军明平文刘常福
Owner SUNRISE POWER CO LTD
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