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Manufacturing process and device of bipolar plate for fuel cell

A fuel cell and manufacturing process technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as dry mixing process and unknown parameters, and achieve the effect of reducing processing costs and improving performance

Inactive Publication Date: 2011-10-05
TONGJI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent [T.Yoshitaka.JP2002160217(A)] mentions the dry mixing method, but the specific dry mixing process and parameters are unknown

Method used

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  • Manufacturing process and device of bipolar plate for fuel cell
  • Manufacturing process and device of bipolar plate for fuel cell
  • Manufacturing process and device of bipolar plate for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] A kind of preparation method of expanded graphite / resin composite bipolar plate for fuel cell, its specific steps are as follows:

[0040] (1) The newly prepared expanded graphite with a worm-like structure is dry mixed with resin powder. Such as figure 1 As shown, the expanded graphite and resin powder are evenly sprinkled on the conveyor belt 3 through the first vibrating feeder 1 and the second vibrating feeder 2. By adjusting the first vibrating feeder 1 and the second vibrating feeder 2 Adjust the ratio of expanded graphite to resin by using parameters such as the feeding speed of the conveyor belt 3 and the walking speed of the conveyor belt 3, so that the content of the resin accounts for 10-50wt%; at the same time, control the total amount of material spilled on the conveyor belt 3 to 0.1g / sec-10g / sec; in order to make the final bipolar plate reach a certain thickness, the total amount of spilled materials can be further increased through the second group, the...

Embodiment

[0055] Add expanded graphite with an expansion ratio of 280 times and phenolic resin powder with a particle size of 30-40 μm respectively figure 1 Shown through the first vibrating feeder 1 and the second vibrating feeder 2, by adjusting the parameters such as the exciting force and the size of the discharge port, the expanded graphite and the phenolic resin are 7: 3, that is, the resin content is The ratio of 30wt% is evenly sprinkled on the conveyor belt 3, and the walking speed of the conveyor belt 3 is adjusted to be 5cm / second. At the same time, the second group and the third group of vibrating feeding units were added to further increase the total amount of spilled materials, so that the height of the expanded graphite / resin finally accumulated on the conveyor belt 3 reached about 1cm. The conveyor belt 3 sends the material to the roller press 4, and after rolling, a pre-pressed plate with a thickness of 5mm is obtained, and the density of the pre-pressed plate is 0.4g / c...

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Abstract

A manufacturing process and a device of a bipolar plate for fuel cells. The process comprises the following steps: dry-mixing expanded graphite and resin powder; pressing the mixed materials of expanded graphite and resin powder into a precompressed plate; pressing again to obtain corresponding flow passages on one side or two sides; separating the precompressed plate with pressed flow passages of the bipolar plate to obtain a molded bipolar plate; curing and cooling the molded bipolar plate to obtain the bipolar plate product. The device comprises at least one group of vibrating feeders which are used to feed the expanded graphite and resin powder on a conveyer belt respectively; a conveyer belt for conveying the mixed expanded graphite and resin powder; a roller press for pressing the mixture on the conveyer belt into a precompressed plate; a block press for pressing the precompressed plate again and obtaining corresponding flow passages, and a curing furnace for curing and molding the bipolar plate. The block press comprises a mold for pressing the flow passages of the bipolar plate. The expanded graphite / resin composite bipolar plate of the invention has excellent performance in conductivity, gas-barrier rate, and mechanical strength, and has low price.

Description

technical field [0001] The invention relates to a molded graphite bipolar plate for a proton exchange membrane fuel cell and a manufacturing process thereof. Specifically, the bipolar plate of a fuel cell is manufactured by one-time molding through a reasonable ratio of expanded graphite / resin by molding. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) converts chemical energy in fuel (hydrogen) and air directly and continuously into electrical energy. Its basic principle is to pass fuel (H 2 or methanol, etc.), the oxidant (O 2 or air), and make them electrochemically react under the action of catalysts to generate water and generate electricity. At the same time, in order to immediately remove the heat generated during the electrochemical reaction, it is also necessary to pass a cooling fluid (generally water or air) into the battery to dissipate heat. When the fuel cell is working normally, the internal fuel, oxidant and cooling liquid must b...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 杨代军马建新徐麟袁亦琳李平李富国陈安定
Owner TONGJI UNIV
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