Metal bipolar plate for proton exchange membrane fuel cell

Abstract

The invention relates to a metal bipolar plate for a proton exchange membrane fuel cell, and the bipolar plate comprises an electrode assembly; the electrode assembly comprises an anode plate and a cathode plate, the backs of the anode plate and the cathode plate are welded, and the anode plate is provided with a first hydrogen inlet and a first oxygen inlet; a second hydrogen inlet, a second oxygen inlet, a second hydrogen outlet and a second oxygen outlet are formed in the cathode plate, a first flow guide area is arranged in the middle of the side, away from the cathode plate, of the anode plate, and a hydrogen channel distributed in a snake shape is arranged in the first flow guide area; the first hydrogen inlet and the first hydrogen outlet are both communicated with the hydrogen channel, a second flow guide area is arranged in the middle of the side, away from the anode plate, of the cathode plate, a plurality of oxygen channels are arranged in the second flow guide area, and the second oxygen inlet and the second oxygen outlet are both communicated with the oxygen channels. The fuel cell has the effects that hydrogen and oxygen react more sufficiently, and the output performance of the fuel cell is improved.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular to a metal bipolar plate for a proton exchange membrane fuel cell. Background technique [0002] In principle, the proton exchange membrane fuel cell is equivalent to the "reverse" device of water electrolysis. A fuel cell consists of a bipolar plate and a proton exchange membrane, wherein the proton exchange membrane is the core of the fuel cell, and the bipolar plate plays the role of collecting current and gas distribution in the fuel cell. [0003] The Chinese utility model patent with authorized notification number CN203760565U discloses a metal bipolar plate for a proton exchange membrane fuel cell. The metal bipolar plate includes a cathode unipolar plate and an anode unipolar plate made of metal sheets. The back of the polar plate and the anode unipolar plate are facing each other, and the opposite surfaces of the cathode unipolar plate and the anode unipolar plate are p...

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Problems solved by technology

[0005] In view of the above-mentioned related technologies, the inventor believes that the groove structure corresponding to the flow field area of ​​the anode unipolar plate and the cathode unipolar plate is the same, and both oxygen and hydrogen diffuse in the groove, but because the diffusion rate of hydrogen is faster than that of oxygen , so the supply rate of oxygen cannot match the supply rate of hydrogen, and part of the hydrogen enters the flow field area and is discharged before reacting, which makes the reaction of hydrogen and oxygen insufficient, reducing the output performance of the fuel cell

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