Air-cooled fuel cell stack and metal bipolar plate thereof

Abstract

The invention discloses an air-cooled fuel cell metal bipolar plate which comprises an anode plate and a cathode plate which are fixedly connected in a laminated manner, the opposite surfaces of the anode plate and the cathode plate are reaction gas circulation surfaces, and the opposite surfaces of the anode plate and the cathode plate are cooling surfaces; a plurality of fuel gas first flow channels extending in the length direction of the anode plate are arranged on the reaction gas flow surface of the anode plate in parallel; a plurality of second fuel gas flow channels extending in the width direction of the cathode plate are arranged on the reaction gas flow surface of the cathode plate in parallel; a plurality of diffusion grooves communicated with the two adjacent fuel gas second flow channels are formed between the two adjacent fuel gas second flow channels; a plurality of cooling gas flow channels extending in the width direction of the cathode plate are arranged on the cooling surface of the cathode plate in parallel; and the cooling gas flow channels and the second fuel gas flow channels are arranged at intervals and penetrate through the two sides of the cathode plate in the width direction. The assembly and preparation difficulty is low, the oxygen concentration under the bipolar plate ridge can be effectively improved, and the hydrothermal distribution in the fuel cell is improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to an air-cooled fuel cell stack and its metal bipolar plate. Background technique [0002] In the existing air-cooled fuel cells, there are two main types of flow field structures of the fuel cells. One uses graphite as the substrate, and the flow field structure is formed by CNC machining; the other uses thin metal plates as the base material. Through a certain forming method (such as stamping forming, hydroforming and roll forming, etc.), a certain groove-like shape is formed as the gas flow field structure. Graphite is selected as the substrate material mainly because graphite has excellent electrical conductivity and corrosion resistance. The formed electrode plate can be used without surface treatment and has low contact resistance, which can effectively reduce the decrease in stack performance caused by contact resistance. However, its shortcomings are also very obvious, the weight...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the distribution of water and heat inside the fuel cell is unreasonable, and the water generated by the electrochemical reaction of the membrane electrode under the ridge cannot be discharged, which will cause the membrane electrode to be flooded.

Its disadvantages are: low volumetric power density of the stack, complex plate structure, low production efficiency, and high manufacturing cost

Its disadvantages are: the structure of the plate is complex, the manufacturing process is complicated, it is not conducive to mass production, the production efficiency is low, and the manufacturing cost is high

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