A Flow Field Plate Structure for Proton Exchange Membrane Fuel Cell

Abstract

The invention discloses a flow field plate structure for a proton-exchange membrane fuel cell. The flow field plate structure comprises a flow field plate body, wherein a runner field which is arranged in a serpentine manner as a whole is formed at the front side of the flow field plate body; a runner air inlet is formed in an initiating terminal of the runner field; the runner field comprises a plurality of single runners which are arranged in parallel and are sequentially connected; a runner shoulder is arranged between two adjacent single runners; a drainage channel is formed in each runnershoulder; a water outlet is formed in the bottom of each drainage channel and communicates with each collection tank formed in the back side of the flow field plate body; and the collection tanks communicate with runner exhaust holes formed in the flow field plate body. The flow field plate structure has the beneficial effects that the drainage channels are formed in the corresponding runner shoulders, a product water is quickly discharged out of the fuel cell through the drainage channels and water outlets near the generation position, and meanwhile, a reactant gas is transported to variousparts of the fuel cell and separated from discharged water, so that the condition of increasing gas in the runners along with the water content in the runners is avoided, the risk of blockage is reduced, meanwhile, the humidity in the runners is more balanced and drainage is facilitated.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a flow field plate structure for proton exchange membrane fuel cells. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a device that uses hydrogen and oxygen as fuels to generate electricity. Compared with the traditional internal combustion engine, there is no combustion process in any form when the fuel cell is working, so no harmful gases such as nitrogen oxides will be generated. Its products are only electricity, water and heat. It is an environmentally friendly and green power generation device. Hydrogen and oxygen (oxygen in the air) respectively enter the gas diffusion layer from the anode and cathode of the fuel cell through the gas channel, and then reach the catalytic layer for electrochemical reaction. The outlet of the anode gas flow channel is excess hydrogen that does not participate in the reaction, and the outlet of the cathode ga...

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Problems solved by technology

Because in these two flow fields, the unreacted gas must pass through the gas diffusion layer (GDL) to reach the outlet and discharge the battery. During this process, the generated water in the GDL microchannel is brought out, so there is less liquid water in the flow channel. However, due to the large resistance of the diffusion layer, the pressure drop in the flow field will increase, and it is prone to short circuit or channel flow.

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