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Bipolar plate with stepped gas guide bosses and fuel cell

A bipolar plate and boss technology, applied in fuel cells, fuel cell parts, circuits, etc., can solve the problems of reduced gas flow velocity downstream of the flow field, weakened gas kinetic energy, loss of gas kinetic energy, etc., so as to increase the concentration of reactants. , The effect of uniform current density and improved drainage performance

Active Publication Date: 2021-08-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 1 It is the parallel flow field of the traditional fuel cell bipolar plate, the gas flow velocity in the upstream of the flow field is fast, the water in the gas diffusion layer is easy to be blown out, and it is not easy to block the gas diffusion layer, with high efficiency and rapid response. The gas flow velocity in the downstream of the flow field decreases, and it is difficult or even impossible to blow out the water in the gas diffusion layer. It is easy to block the gas diffusion layer, reduce the efficiency of the fuel cell, and seriously cause water flooding
[0004] Although spoilers or baffles are installed in the flow field in the related art, the raised structures are often arranged at the same height, which will also cause uneven gas entry into the gas diffusion layer along the length of the flow field, which in turn leads to water and heat distribution. Inhomogeneous; at the same time, the cross-sectional shape of the raised structure does not fully consider the airflow characteristics, which will lose part of the airflow kinetic energy

Method used

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  • Bipolar plate with stepped gas guide bosses and fuel cell
  • Bipolar plate with stepped gas guide bosses and fuel cell
  • Bipolar plate with stepped gas guide bosses and fuel cell

Examples

Experimental program
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Embodiment 1

[0039] refer to Figures 2 to 8 , the present invention provides a bipolar plate with stepwise arrangement of air guide bosses, comprising a bipolar plate body 1, a reaction gas inlet and a cooling liquid inlet 5 are provided at the front end of the bipolar plate body 1, and a rear end of the bipolar plate body 1 is provided with There are reaction gas outlets and cooling liquid outlets 8. The middle part of the bipolar plate body 1 is provided with a flow field 2 that connects the reaction gas inlet and the reaction gas outlet. The flow field 2 includes flow field ridges 23 and flow field grooves 22. The flow field ridges 23 is arranged in parallel with the flow field groove 22 and arranged at intervals. The bottom surface of the flow field groove 22 is fixedly provided with multi-stage gas guiding bosses 221, and the height of the gas guiding bosses 221 increases step by step along the gas flow direction.

[0040] Preferably, the size of the entire flow field 2 is 60mm×50mm,...

Embodiment 2

[0056] refer to Figure 9 , the difference between this embodiment and Embodiment 1 is that the flow field groove 22 and the flow field ridge 23 are serpentine, that is, the flow field 2 is a serpentine flow field, and the entire flow field of the serpentine flow field is from the gas inlet to the gas outlet. Connected, there are two turns, the gas pressure drop is small, and it is more suitable for the design of the stepped boss. Its principle is the same as that of the parallel flow field, so it will not be repeated here. Bar splitter 214.

[0057] The invention can improve the unfavorable phenomenon that the membrane tends to dry up caused by too fast airflow velocity at the inlet of the parallel flow field and the serpentine flow field and the membrane tends to be flooded caused by insufficient airflow pressure at the outlet. Make the gas pressure drop more uniform, and then make the water distribution in the membrane more uniform, so as to achieve the effect of uniform d...

Embodiment 3

[0060] A fuel cell, comprising a bipolar plate with stepwise arrangement of air-guiding bosses in Embodiment 1 or Embodiment 2.

[0061] It should be noted that the gas guiding and constant pressure functions of the stepped air guiding bosses in the present invention are not limited to the semi-droplet configuration, and other existing ones with better gas guiding and constant pressure can also be adopted. The design configuration of the function takes into account the flow field structure of the bipolar plate and the size of the bipolar plate body.

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Abstract

The invention relates to the technical field of proton exchange membrane fuel cells, and discloses a bipolar plate with stepped gas guide bosses. The bipolar plate comprises a bipolar plate body, wherein the front end of the bipolar plate body is provided with a reaction gas inlet and a cooling liquid inlet, and the rear end of the bipolar plate body is provided with a reaction gas outlet and a cooling liquid outlet. The middle part of the bipolar plate body is provided with a flow field for communicating the reaction gas inlet with the reaction gas outlet, the flow field comprises flow field ridges and flow field grooves which are arranged at intervals with the flow field ridges, the bottom surfaces of the flow field grooves are fixedly provided with a plurality of stages of gas guide bosses, and the heights of the gas guide bosses are gradually increased along the gas flow direction; in addition, the invention also discloses a fuel cell. The fuel cell comprises the bipolar plate with the gas guide bosses arranged in a stepped manner. The gas guide boss is wide in application range, gas flow kinetic energy can be reasonably utilized, small gradient pressure drop is achieved, the concentration of reactants near the membrane electrode is improved, and accumulation of liquid water in the gas diffusion layer is reduced.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a bipolar plate and a fuel cell with stepwise arrangement of gas guiding bosses. Background technique [0002] Proton exchange membrane fuel cells are sealed by bipolar plates, membrane electrodes, gas diffusion layers and end plates. Bipolar plates are important components of fuel cells. Each set of bipolar plates includes a cathode plate and an anode plate, which respectively bear The task of sending oxidizing gas and reducing gas into the membrane electrode for reaction. The reducing gas is usually hydrogen, and the oxidizing gas is usually oxygen. The hydrogen enters the gas diffusion layer through the flow field of the bipolar plate and passes through the membrane electrode. The oxidation reaction occurs at the membrane electrode and releases electrons to become hydrogen ions. The hydrogen ions migrate through the proton exchange membrane to The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258H01M8/026H01M8/0265H01M8/0267H01M8/1007
CPCH01M8/0258H01M8/026H01M8/0265H01M8/0267H01M8/1007H01M2008/1095Y02E60/50
Inventor 刘军恒马浩然刘源孙平嵇乾王攀
Owner JIANGSU UNIV