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Production method for flexible graphite polar plate with plough groove on both faces

A manufacturing method, flexible graphite technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, battery electrodes, etc., can solve the problems of bipolar plate leakage, increase plate thickness, impermeability, etc.

Inactive Publication Date: 2008-07-16
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the prior art are: when forming a pole plate with grooves on both sides, since the low-density expanded graphite is a porous material, during the densification process, the open pores are closed to form high-pressure pores, and the pores are further compressed during pressure forming. Compression, even expansion, the bipolar plate made of this material is prone to leakage. In order to maintain the impermeability to gas and liquid, the thickness of the plate must be greatly increased, which will increase the volume of the fuel cell

Method used

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  • Production method for flexible graphite polar plate with plough groove on both faces
  • Production method for flexible graphite polar plate with plough groove on both faces

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The 50-mesh expandable graphite with an expansion volume of 200ml / g is fully mixed with 10% by weight acicular wollastonite powder. Rolled to make a thickness of 4.5mm and a density of 0.2g / cm 3 , Expanded graphite plate with a width of 450mm and a length of 500mm, cut this graphite plate into a 450×120mm plate, put such a graphite plate in a closed impregnation tank, first evacuate the impregnation tank, and the vacuum degree reaches -0.1MPa, then Inhale the resin solution and immerse in the ethanol solution mixed with phenolic resin and epoxy resin. The immersion time is about 10 minutes. The proportioning ratio of the resin solution is phenolic resin: epoxy resin: ethanol=10:5:85 (weight ratio). After impregnation, volatilize at normal temperature, and then dry at a temperature of about 90°C for about 2 hours, and the weight gain of the resin is between 15-50%. Put the dried graphite plate on the metal mold with grooves on the top and bottom, put the mold on the fl...

Embodiment 2

[0024] The same steps as in Example 1 are used to process the original plate thickness of 4.5mm expanded graphite plate, and the obtained overall thickness is 1.1mm, the depth of one side of the flow field is 0.5mm, and the width is 1.0mm, and the depth of the other side is 0.2mm, and the width is 0.8mm. mm fuel cell cathode plate.

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Abstract

The invention relates to a manufacturing method for a flexible graphite pole plate both surfaces of which are provided with grooves, comprising the following steps: firstly, expandable graphite raw materials are rolled or extruded into a low density graphite plate with thickness of 1.5 to 8 millimeters and density of 0.15 to 0.5 gram per cubic centimeter; secondly, the low density graphite plate is infused into a low viscosity resin solution until grain in weight of resins is 15 to 50 percent of weight of the low density plate; the low density graphite plate is dried after being taken out and solvent in an infused plate is removed, and then a drying plate is obtained; thirdly, the drying plate is extruded into the pole plate both surfaces of which are provided with the grooves; fourthly, the pole plate both surfaces of which are provided with the grooves is solidified. The invention is characterized in that: the step in which the drying plate is extruded into the pole plate both surfaces of which are provided with the grooves is that the dried low density graphite plate after infusion in the low viscosity resin solution is extruded into the pole plate both surfaces of which are provided with the grooves under the condition of vacuum. The invention has the advantages that: thickness of the flexible graphite double pole plate is reduced; isotropy degree of particle orientation of the expandable graphite materials is improved; longitudinal resistivity of the expandable graphite plate materials is reduced.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method for manufacturing flexible graphite pole plates for fuel cells. Background technique [0002] The bipolar plate of the proton exchange membrane fuel cell is an important part of the proton exchange membrane fuel cell. It acts as a single cell in series, and also has channels and coolant channels for supplying fuel and oxidant to the single cell. It also has the function of separating fuel and oxidant. Therefore, it is required that the bipolar plate should have electrical conductivity, be impermeable to gas and coolant (water), and have corrosion resistance to fuel, oxidant, and electrolyte membrane. [0003] Using expanded graphite formed plates as bipolar plates is an option for bipolar plates. In the prior art, the use of expanded graphite forming plates to make bipolar plates is to roll expanded graphite into a low-density flat plate, then impregna...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/02H01M8/10H01M8/0234H01M8/1004
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 徐洪峰傅云峰罗晓宽明平文
Owner SUNRISE POWER CO LTD
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