Proton exchange membrane fuel cell flow channel

Abstract

The invention discloses a proton exchange membrane fuel cell flow channel. The proton exchange membrane fuel cell flow channel comprises at least one branch flow channel, wherein a plurality of geometric partition structures with variable contact angles are arranged on the flow channel wall of each branch flow channel in the flow direction of gas and the water drainage direction, and the contact angles of the geometric partition structures with the variable contact angles are reduced sequentially from each branch flow channel inlet to the corresponding branch flow channel outlet. The proton exchange membrane fuel cell flow channel has the advantages of being simple in structure, easy to process and low in cost; due to the fact that the contact angle gradual change structures of different partition areas are arranged in the flow direction of the gas, the contact angles in each branch flow channel are reduced sequentially from the corresponding inlet to the corresponding outlet, the hydrophilicity gradually increases, and therefore surface tension gradients of water drops exist on each branch flow channel wall face, the transmission driving force of the water drops is increased in the decreasing direction of the contact angles of each branch flow channel, transmission of the water drops from the interior of each branch flow channel to the corresponding outlet, and water generated on a cathode can be fast drained to the corresponding outlet through each branch flow channel.

Description

technical field [0001] The invention relates to a flow channel, in particular to a flow channel used for discharging water from the cathode product of a proton exchange membrane fuel cell. Background technique [0002] A proton exchange membrane fuel cell consists of an anode, a cathode, and an electrolyte membrane between the electrodes. The anode and the cathode respectively use hydrogen and oxygen as fuels to directly convert chemical energy into electrical energy. The only product is water generated by the electrochemical reaction at the cathode. The flow channel of the fuel cell is the main channel for the fuel reaction gas to be transported from the outside to the inside of the battery, and the product of the electrode catalytic layer to be transported from the electrode to the outside of the battery. An important factor in utilization and battery performance. Parallel flow channels and serpentine flow channels are typical traditional fuel cell flow channels, such as ...

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Problems solved by technology

So far, there is no relevant report on the change of flow channel contact angle and the influence of contact angle design on cathode drainage and battery performance of proton exchange membrane fuel cells

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