Guide plate and fuel cell stack containing the same

Abstract

The invention belongs to the technical field of fuel cell, and relates to a novel guide plate and a fuel cell stack containing the same. A fluid channel of the guide plate is made of a porous material; the guide plate includes a negative plate and a positive plate, which have the same or different structures and are both made of two materials with different apertures of in the cathode plate by two different aperture material plate holder with at least one layer of membrane material, the first porous plate as the oxidant flow, section more than and 2 hole plate as the cooling fluid flow through the control of the two sides of the membrane material pressure or humidity to control the water circulation in the membrane material on both sides the water entering into the system, the first multi hole wet oxidizing agent, or reaction of the water is discharged through the orifice more than and 2.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and specifically proposes a new deflector and a fuel cell stack containing the deflector. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrode reaction. A fuel cell is generally constructed of a plurality of cells, each cell comprising two electrodes (anode and cathode) separated by an electrolyte element and assembled in series with each other to form a fuel cell stack. The electrochemical reaction is achieved by supplying the appropriate reactants to each electrode, ie fuel to one electrode and oxidant to the other, creating a potential difference between the electrodes and thereby generating electrical energy. [0003] In order to supply each electrode with reactants, specific interface elements commonly referred to as "bipolar plates" and arranged on both sides of each individual...

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Problems solved by technology

In addition, in these overall or local areas, the concentration of fuel and oxidant is also uneven. In the working state, the electrical transient effect generated by the fluctuation of the supply of reactants may generate a large voltage at both ends of the flow channel. Similarly, such a large voltage difference may also occur in the lateral direction of the reflection area of ​​the membrane electrode assembly (MEA), and there may also be a voltage difference between the flow channels due to the uneven release of reactants. This will lead to a large lateral (Inplane) current inside each battery cell, resulting in electrochemical corrosion of the membrane electrode, which will greatly reduce the service life of the fuel cell

And the region with a large supply of reactants is limited to the region with a small supply of reactants. This correlation effect will also cause the output voltage of the region with a large supply of reactants to be pulled down, affecting the output power of the fuel cell.

[0006] However, the current improvement of deflectors has been focused on the design of sub-regions or optimized flow channels. However, due to the viscous shear stress in the flow channels, the fluid flows in a parabolic shape during its flow process, which cannot completely solve the problem of uneven fluid distribution. problem, and because the MEA membrane electrode is very thin, it forms a suspension above the flow channel, the pressure is high, and it is easy to damage

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