A proton exchange membrane fuel cell bipolar plate based on the flow field of the labyrinth baffle structure

Abstract

The invention discloses a proton exchange membrane fuel cell bipolar plate based on a labyrinth-baffle-plate-structured flow field. The proton exchange membrane fuel cell bipolar plate includes a rectangular gas flow field (1), the reaction gas inlet (11) and the reaction gas outlet (12) of which are located at two ends of one diagonal of the gas flow field (1) in diagonal distribution. A plurality of ridges (13) with the same height and a plurality of baffle plates (15) are distributed in the gas flow field (1). The gas flow field (1) is internally divided by the ridges (13) into to a plurality of flow channels (14) with the same width, and all the baffle plates (15) arranged along the other diagonal of the gas flow field (1) and the ridges (13) located on the diagonal form a flow channel dam along the diagonal. The labyrinth-baffle-plate-structured flow field allows forced convection and water discharge capacity of the reaction gas to be improved, the gas is made to be uniformly distributed, and the electrochemical reaction efficiency of the cell is increased. The electric current density becomes uniform, and the electrochemical performance of the whole fuel cell is improved.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cell bipolar plates, in particular to a proton exchange membrane fuel cell bipolar plate based on the flow field of a labyrinth baffle structure. Background technique [0002] In today's era of energy crisis and environmental pollution problems, fuel cells, as a clean energy with high energy efficiency and zero pollution, are favored and widely studied. Among them, the proton exchange membrane fuel cell is a device that undergoes a chemical reaction between hydrogen and oxygen in the air under certain conditions, thereby directly converting chemical energy into electrical energy. Due to the advantages of no pollution, high energy conversion rate, and fast start-up, proton exchange membrane fuel cells have very good application prospects. One of the most important components in the proton exchange membrane fuel cell is the bipolar plate, which plays the role of evenly distributing the ...

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Problems solved by technology

The point flow field abandons the flow field to a certain extent. The fluid, including reactants and products, tends to flow in the direction of the least flow resistance, and the uniformity of fluid flow cannot be guaranteed. Therefore, the corner position of the point flow field is likely to stagnate. Blockage will affect the reaction efficiency of the battery

Due to the total pressure drop between the inlet and outlet of the reaction gas in the parallel flow field, the fluid distribution in each flow channel will be uneven, causing water flooding in some areas, resulting in an increase in transmission loss, thereby reducing the current density

Although the flow path of the serpentine flow field can promote the discharge of liquid water and has good drainage performance, the disadvantage of the serpentine flow field is that in a large-area flow field, the pressure drop is large and the gas concentration distribution is uneven.

The interdigitated flow field can greatly enhance the forced convection and drainage capacity of the reaction gas, but the pressure requirements for the intake air are relatively high, and the local pressure drops suddenly

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