Metallic bipolar plate shaped by sheet-metal press working

Abstract

The invention relates to a bipolar plate of a proton exchange membrane fuel cell, in particular to a metal bipolar plate stamping with plate materials, comprising a metal positive single-polar plate and a metal negative single-polar plate which are respectively provided with a common channel for oxidizers, a common channel for reducer and a common channel for cooling media. A water frame is arranged between the positive single-polar plate and the negative single-polar plate. A metal stretch net serving as a cooling water flow field is arranged inside the water frame. The edges of the common channel for oxidizers, the common channel for reducers, the common channel for cooling medium, the positive single-polar plate and the negative single-polar plate are all turned outside with cylindrical bumps. The invention greatly improves the effective use area and use rate of the bipolar plate.

Description

technical field [0001] The invention relates to a bipolar plate of a proton exchange membrane fuel cell, in particular to a metal bipolar plate structure that can be used for stamping and forming a metal bipolar plate of a proton exchange membrane fuel cell, which can improve the utilization rate of the bipolar plate. Background technique [0002] PEMFC directly converts the chemical energy stored in fuels (such as hydrogen) and oxidants (such as air) into electrical energy, and has great application prospects in ground power stations, transportation, and portable power supplies. The voltage of the PEMFC single cell is very low (0.6-0.7V). In order to obtain useful current and voltage, it is necessary to connect multiple single cells in series to form a battery stack. The separator that separates two adjacent single cells is called a bipolar plate. The bipolar plate is a multifunctional component of PEMFC. Its basic function is to provide reactants to the fuel cell electrod...

AI Technical Summary

Problems solved by technology

Metal bipolar plates usually adopt two forms, one is the method of separating the flow field from the current collector plate, that is, the current collector plate is made of stainless steel and other technical light plates, and the metal mesh flow field is metal mesh, such as US patent US6,207,310 [Document 1. Wilson; Mahlon S.; Zawodzinski; Christine, "Fuel cell with metal screen flow-field", [P].US6,207,310]. The disadvantage is that the metal mesh is difficult to fix, and the multi-layer mesh is difficult to ensure the matching of all batteries uniform

But in fact, if you want to use two monopoles to be directly bonded or welded together, you can not only satisfy the water channel between the two plates, but also ensure that the gas can enter each flow field channel through the common pipeline. is difficult to achieve

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