Flow field plate structure for increasing drainage performance of fuel cell

Abstract

The invention provides a flow field plate structure for increasing drainage performance of a fuel cell, wherein the flow field plate structure comprises a flow field plate, an upper support layer, a liquid absorbing material, a gas diffusion layer and a catalytic layer; the top of the flow field plate is provided with the upper support layer, and the edge of the bottom face of the upper support layer is connected with the edge of the top face of the flow field plate; the middle of the bottom face of the upper support layer is provided with a hollow-out layer; the bottom of the flow field plate is provided with the gas diffusion layer and the catalytic layer from top to bottom; the liquid absorbing material is arranged vertically, the lower part of the liquid absorbing material makes contact with the gas diffusion layer, and the upper part of the liquid absorbing material passes through the flow field plate and is connected with the upper support layer; the upper support layer and the flow field plate are respectively provided with dry gas inlets, reaction gas inlets and reaction gas outlets which communicate correspondingly, the upper support layer is provided with a dry gas outlet, and the dry gas inlets communicate with the liquid absorbing material. The flow field plate structure has the advantages that the flow field plate structure is provided with dry gas flow channels alone, dry gas is used for achieving transpiration of the liquid absorbing material, and flow of the dry gas of the fuel cell and flow of reaction gas of the fuel cell are not interfered with each other.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a flow field plate structure for improving the drainage performance of fuel cells. Background technique [0002] The water management and temperature problems of fuel cells have always been the main factors that plague their performance improvement. When the fuel cell stack works at a high current density, it is prone to "water flooding" and overheating in the battery, which seriously affects performance of the fuel cell. Therefore, it is necessary to adopt a reasonable method to improve the water management problem in the fuel cell and to cool the battery so as to improve the working performance of the fuel cell. At present, there are many designs of different flow field plate flow channel structures and improved materials in the battery. Although these methods have alleviated the degree of "water flooding" and excessive temperature in the battery to a certain extent, they a...

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Problems solved by technology

[0002] The water management and temperature problems of fuel cells have always been the main factors that plague their performance improvement. When the fuel cell stack works at a high current density, it is prone to "water flooding" and overheating in the battery, which seriously affects fuel cell performance

[0004] Although there is a bionic structure of related flow field plates in the prior art, it only uses the flow of reaction gas to drive transpiration. This structure can only be used for fuel cells with a specific power range, and the drain channel of the fuel cell and the reaction gas The channels are connected, and the drying rate can only be adjusted by changing the drying degree of the reaction gas, and the drainage rate of the fuel cell is limited

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