Fuel cell flow field plate

Abstract

The invention discloses a fuel cell flow field plate, which comprises an anode / cathode flow field plate body, wherein the upper end face of the anode / cathode flow field plate body is provide with a sealing support plate with a cavity, the upper end face of the anode / cathode flow field plate body is provided with gas diffusion layers in the cavity, the upper end faces of the gas diffusion layers are provided with the same number of catalyst coating films, and the upper end face of the sealing support layer is provided with protective edges capable of installing the catalyst coating films; and there is a gap between the edges of the gas diffusion layer and the inner edges of the sealing support layer, and the gap is a peripheral portion of a gas flow channel. The fuel cell flow field plate has the advantages of ingenious structure deign and low cost. The adoption of the fuel cell flow field plate can ensure the consistency of the flow field, enables the uniformity, temperature and rate of the reaction to be more stable, improves the power density of the fuel cell and enables the performance and efficiency to be better. Meanwhile, the battery thickness is further reduced, the weight is reduced, the processing difficulty is also lowered, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a fuel cell flow field plate. Background technique [0002] At present, a hydrogen-air fuel cell is a device that converts the anode and cathode gases into electrical energy through an electrochemical reaction under the action of a catalyst; among them, the design of the flow field structure is one of the core technologies of the fuel cell stack. The design level of the structure will affect the operation of the oxidant, reductant and coolant in the fuel cell, and then affect the uniformity of the reaction, the reaction temperature and the flow rate of the air flow, and finally affect the performance and efficiency of the fuel cell; at the same time, The manufacturing cost of the flow field plate also accounts for 20-30% of the cost of the fuel cell. [0003] Existing fuel cell flow field structures are mostly manufactured by removing material or stamping. Machining in the form of material remova...

AI Technical Summary

Problems solved by technology

Machining in the form of material removal requires a lot of processing costs and time. Because it is thin plate processing, it is difficult for conventional processing equipment to meet the required processing consistency, and the thickness of a single cell composed of flow field plates processed in the form of material removal Larger, the weight and volume of the fuel cell are difficult to compress

Although the flow field plate formed by stamping has better consistency, smaller size and lighter weight, it requires expensive mold investment during development. If there is a new product to be developed, mold costs have to be invested again

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