Corrugation staggered fuel cell bipolar plate structure

Abstract

The invention discloses a corrugation staggered fuel cell bipolar plate structure. The bipolar plate structure comprises an upper bipolar plate, a lower bipolar plate and a membrane electrode combination body, wherein the membrane electrode combination body is arranged between the two bipolar plates; the membrane electrode combination body comprises a cathode diffusion layer, a cathode catalyst layer, a proton exchange membrane, an anode catalyst layer and an anode diffusion layer from top to bottom; the cross sections of the bipolar plate along the flow direction of a fuel gas are in a wave shape, so that the bipolar plates form a plurality of strip-shaped peak portions and strip-shaped valley portions which are alternately arranged in a peak-valley shape; a plurality of corrugated protrusions which penetrate into the gas flow channels are uniformly distributed in the strip-shaped peak portions of the bipolar plate at intervals along the direction of the gas flow channel; and the corrugated protrusions on every two adjacent gas flow channels are arranged in a staggered mode. According to the structure, the gas convection in a rib lower diffusion layer is enhanced through the protrusions arranged in the gas flow channels in a staggered manner, the uniformity of reactant distribution is improved, better performance output and stability are achieved, and the power density and theservice life of the fuel cell are improved and prolonged.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a fuel cell bipolar plate flow channel structure which enhances drainage performance through corrugated staggered arrangement. Background technique [0002] A fuel cell is a device that generates electricity through an electrochemical reaction of hydrogen and oxygen. With the urgent demand for clean energy, it has gained widespread attention. The proton exchange membrane fuel cell is a relatively mature fuel cell technology. It uses renewable energy - hydrogen, oxygen, and the reaction product is water, thus achieving zero emissions. [0003] The single cell of the fuel cell is mainly composed of three parts: the membrane electrode (diffusion layer, catalyst, and proton exchange membrane hot-pressed), the bipolar plate and the sealing material. The bipolar plate needs to have multiple functions, mainly including: separating the reaction gas ; Make the reaction gas reach the membrane electrode to ...

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Problems solved by technology

However, this method needs to install a separator on the opposite side of the electrode plate and the membrane electrode to separate the cooling liquid and the reaction gas, thereby greatly increasing the volume and weight of the fuel cell, and failing to take into account the power density of the fuel cell.

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