Metallic bipolar plate of proton exchange membrane fuel cell and single cell and electric stack formed by same

Abstract

The invention discloses a metallic bipolar plate of a proton exchange membrane fuel cell and a single cell and an electric stack formed by the same. The metallic bipolar plate is a non-planar arc plate with certain curvature, and is formed by relatively combining a cathode monopolar plate and an anode monopolar plate which are made of metal sheets; cathode and anode cavities, cooling medium cavities, flow field area grooves and lug bosses of the two plates have mutual corresponding convex-concave shapes and form a fuel gas passage, an oxidant gas passage and a cooling medium passage respectively; and a membrane electrode and single bipolar plate can be combined into single fuel cell, and a plurality of single cells can be superposed and connected to form the electric stack. Compared with a common metallic bipolar plate, the bipolar plate has better mechanical property, is not easy to deform or dislocated after assembly, and has high stability; and because the contact between the bipolar plate and a diffusion layer of the membrane electrode is good, the internal resistance is low, the energy consumption is low, and the formed electric stack can provide higher output voltage and higher output power.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a bipolar plate of a proton exchange membrane fuel cell, and a fuel cell single cell and an electric stack respectively composed of the bipolar plate. Background technique [0002] Proton exchange membrane fuel cells have become one of the research hotspots because of their advantages such as high power density, simple structure, fast start-up speed, no corrosion, etc., and a wide range of applications. The bipolar plate is the core component of the proton exchange membrane fuel cell, which accounts for most of the weight and cost of the battery pack. It plays the role of separating the reactant gas and introducing the reactant gas into the fuel cell through the flow field, collecting and conducting current, and supporting the membrane electrode. , and also undertake the heat dissipation and drainage functions of the entire fuel cell system, and its performance dir...

AI Technical Summary

Problems solved by technology

However, ordinary flat metal bipolar plates are prone to warping and deformation due to factors such as stress changes during forming, which reduces their flatness, and eventually leads to incomplete contact between the boss part of the flow field area and the diffusion layer of the membrane electrode and reduces the contact. area, increasing the contact resistance

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