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Preparation method of composite bipolar plate for fuel cell and three-dimensional flow field design scheme

A fuel cell and three-dimensional flow field technology, which is applied to fuel cells, fuel cell components, circuits, etc., can solve problems such as hindering gas mass transfer process, affecting fuel cell power generation process, and fuel cell flooding, so as to reduce water pollution. Probability of "flooding" phenomenon, low gas permeability, and the effect of improving the gas mass transfer process

Active Publication Date: 2019-03-19
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

During the long-term operation of the fuel cell, due to the generation of a large amount of water, it will cause the phenomenon of "flooding" of the fuel cell, which will hinder the mass transfer process of the gas and seriously affect the power generation process of the fuel cell

Method used

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  • Preparation method of composite bipolar plate for fuel cell and three-dimensional flow field design scheme
  • Preparation method of composite bipolar plate for fuel cell and three-dimensional flow field design scheme
  • Preparation method of composite bipolar plate for fuel cell and three-dimensional flow field design scheme

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Embodiment 1

[0032] Such as figure 1 As shown, a composite bipolar plate for fuel cells, the composite bipolar plate has a three-layer structure, the middle layer 1 is composed of a low gas permeability composite carbon plate, which will not be engraved and lost during the engraving process of the subsequent flow field, as The flow field groove part plays the role of separating the cathode and anode reaction gases; the two sides of the middle layer 1 are composed of expanded graphite plates 2 with a porous structure, which form the ridge part of the composite bipolar plate after engraving in the subsequent flow field, so that the reaction gas and The water generated in the power generation process can be transported in its porous structure, which plays the role of increasing the effective area of ​​reaction gas transmission and improving the drainage efficiency of fuel cells. The three-dimensional flow field engraved on the expanded graphite plate 2 is a flow field in which the flow channe...

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Abstract

The invention relates to a preparation method of a composite bipolar plate for a fuel cell and a three-dimensional flow field design scheme thereof. The composite bipolar plate has a three-layer structure composed of a composite carbon plate having a low gas permeability in the middle and an expanded graphite plate having a porous structure on the outer side. The flow field is engraved on the outer porous expanded graphite plate, and the porous structure of the outer expanded graphite plate is used to increase the fuel cell gas transmission effective area and improve the fuel cell drainage efficiency. The three-dimensional flow field engraved on the expanded graphite plate is arranged at intervals of lower width and narrower than the traditional rectangular cross-section flow path. By controlling the opening and closing of the lower width and upper narrow flow path, the forced gas generates flowing in the direction perpendicular to the surface of the bipolar plate, so as to realize three-dimensional transmission of gas, thereby effectively improving the gas mass transfer process inside the fuel cell, preventing water flooding, and improving the power generation performance and operational stability of the fuel cell.

Description

technical field [0001] The invention relates to a composite bipolar plate for a proton exchange membrane fuel cell and the design of a flow field. Background technique [0002] At present, environmentally friendly green new energy is an international research hotspot. Hydrogen energy is a green renewable new energy source, and proton exchange membrane fuel cell is a green power generation device that uses hydrogen as fuel and directly converts the chemical energy in hydrogen into electrical energy, which only discharges water. The fuel cell technology has been widely used in fields such as stationary power stations, portable power supplies, and electric vehicle drive power supplies. [0003] Bipolar plates are one of the key materials of proton exchange membrane fuel cells, which play important roles in supporting electrodes, separating cathode and anode gases, transporting gaseous fuel, and conducting electrons in fuel cells. In the traditional bipolar plate design, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258H01M8/0234H01M8/0245
CPCH01M8/0234H01M8/0245H01M8/0258H01M8/026H01M8/0265
Inventor 王树博谢晓峰
Owner TSINGHUA UNIV
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