Metal foam flow field plate and fuel cell comprising the metal foam flow field plate
A technology of metal foam and metal foam layer, which is applied to fuel cells, circuits, electrical components, etc., can solve problems such as affecting battery performance, increasing battery concentration loss, and flooding.
Active Publication Date: 2021-03-23
TSINGHUA UNIV
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Problems solved by technology
The traditional gas flow channel is generally a ribbed structure. The disadvantage is that the water generated by the cathode is easy to accumulate under the ribs. Under high current density, water flooding may occur, resulting in blocked gas transport channels and gas mass transfer resistance. Increased battery concentration loss seriously affects battery performance
[0004] Therefore, the existing flow field plates for fuel cells still need to be improved
Method used
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Embodiment 1
[0044] Utilize the metal foam flow field plate of the present invention as the cathode flow field plate to prepare a proton exchange membrane fuel cell, its structure is as follows Figure 5 shown. Figure 5 Among them, 1-the metal foam with weak upper layer hydrophobicity (the first part of the second metal foam layer), 2-the metal foam with strong hydrophobicity at the upper layer (the second part of the second metal foam layer), 3-the lower hydrophilic metal foam ( The first foam metal layer), 4-cathode plate, 5-cathode gas diffusion layer, 6-cathode catalytic layer, 7-proton exchange membrane, 8-anode catalytic layer, 9-anode gas diffusion layer, 10-anode flow channel , 11-anode plate, 12-cathode, 13-anode).
[0045] In this embodiment, the metal foam material is copper (Cu), the porosity is 90%, and the PPI is 40. The thickness of the upper metal foam 1 and 2 is 0.8mm, the thickness of the lower metal foam 3 is 0.4mm, and the upper metal foam 1 It is equal to the width ...
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Abstract
A foam metal flow field plate and a fuel cell including the foam metal flow field plate are disclosed. The foam metal flow field plate includes a first foam metal layer formed of a first foam metal; asecond foam metal layer formed on at least a portion of a surface of the first foam metal layer, the second foam metal layer comprising a plurality of first portions and a plurality of second portions arranged alternately, the first portion being formed of a second foam metal and the second portion being formed of a third foam metal; Wherein the hydrophobicity of the third foam metal, the secondfoam metal and the first foam metal decreases sequentially. The foam metal flow field plate can effectively promote the discharge of water generated in the fuel cell, thereby improving the performanceof the fuel cell.
Description
technical field [0001] The invention relates to the technical field of fuel cells, in particular, the invention relates to a metal foam flow field plate and a fuel cell comprising the metal foam flow field plate. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high efficiency, high energy density and low pollution, so it has attracted extensive attention of researchers in many fields. Among them, the energy density is an important index to measure the performance of PEMFC. To further improve the energy density of the battery, on the one hand, it depends on the design of the membrane electrode assembly (MEA), and on the other hand, it depends on the reasonable design of the flow field plate. The design of the flow field plate mainly has the following goals: to ensure that the reaction gas is evenly distributed in the flow channel surface, and to facilitate the transport of the reaction gas to the gas diffusion layer, and at the s...
Claims
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IPC IPC(8): H01M8/0232H01M8/0245H01M8/0258
CPCH01M8/0232H01M8/0245H01M8/0258Y02E60/50
Inventor 尧磊彭杰张剑波张扬军诸葛伟林
Owner TSINGHUA UNIV