Fuel cell liquid water self-adaptive flow field plate capable of automatically switching between parallel flow field and snakelike flow field

Abstract

The invention discloses a fuel cell self-adaptive flow field plate capable of automatically switching between a parallel flow field and a snakelike flow field. The flow field plate structurally comprises a reactant inlet, a reactant outlet, an inlet header pipe, an outlet header pipe, a plurality of ridges arranged on the flow field plate, a flow channel, flow field plate walls on the periphery, grooves formed in the wall surfaces of the two sides of the header pipe, and arranged self-adaptive structures. When liquid water is accumulated in the header pipe, the self-adaptive structure in the flow field absorbs water and expands, the local cross section area of the header pipe is gradually reduced, and even the header pipe is blocked, so that the flow field plate is partially or completely changed into a snakelike flow field from a parallel flow field; when no liquid water is accumulated in the header pipe, the header pipe is purged by airflow at the operating temperature of the battery, internal moisture is evaporated, and the self-adaptive structure is dehydrated and shrunk to become a parallel flow field. According to the self-adaptive change of the content of the liquid water in the header pipe, different working conditions can be adapted, the removal of the liquid water is accelerated, the water logging phenomenon is avoided, the pump power consumption is reduced, and the net power of a battery is improved.

Description

Technical field: [0001] The invention belongs to the field of fuel cells, and in particular relates to a fuel cell liquid water self-adaptive flow field plate structure. Background technique: [0002] The prospects and trends of energy development have a major impact on national policies and corporate development strategies. The development of energy technology will affect a country's international status. Therefore, my country attaches great importance to the development of energy technology. In recent years, my country has issued a series of policies to promote the development of hydrogen fuel cell related industries. There are more and more hydrogen fuel cell related enterprises and companies, and the development of hydrogen fuel cell industry is advancing rapidly. [0003] The structure of the flow field plate affects the performance of the fuel cell. There are some shortcomings in the traditional flow field plate, which still needs to be improved. In a parallel flow...

AI Technical Summary

Problems solved by technology

[0004] At present, researchers have optimized the size of the parallel flow field from the channel depth, width, ridge width, etc., and added stoppers in the channel to promote mass transfer and accelerate liquid water removal, but adding stoppers will increase the two-phase flow The optimization of the serpentine flow field lies in the optimization of the number of flow channels and corner design. Although these optimizations have improved the performance of the fuel cell in the serpentine flow field, the problems of large pressure drop and increased pump power consumption are still unresolved. get well resolved

Images