Preparation method of pre-coated metallized coils for fuel cell metal bipolar plates

Abstract

The invention discloses a preparation method of a pre-coated metal strip used for a metal bipolar plate of a fuel cell; the method includes selecting a precision metal strip material as a base strip to be coated, and pre-treating the surface of the base strip; adopting "roll-to-roll" Physical vapor deposition first deposits transition coatings such as nickel and titanium on the surface of one side of the baseband after pretreatment, and then deposits the graphitized coating; repeating the operation of step S2 on the other surface of the baseband, that is, to obtain pretreatment on both sides. Coated metal reel. The prepared pre-coated metal strip can be stamped into a bipolar plate with a preset flow field and shape through a die at high speed. After the two unipolar plates (anode / cathode) are welded, a complete bipolar plate is formed, and finally assembled directly into the fuel cell stack. The metal-based tape of the invention can meet the performance requirements of the fuel cell for the bipolar plate, greatly improve the production efficiency, reduce the production cost by more than 50%, and truly achieve the purpose of accelerating the commercialization and industrialization of the fuel cell industry.

Description

technical field [0001] The invention relates to a method for preparing a precoated metallized coil used for a metal bipolar plate of a fuel cell. Background technique [0002] New energy is a national key development strategic layout direction, fuel cell is one of the representatives, and it is also one of the cleanest energy sources. Among the many types of fuel cells, especially the proton exchange membrane fuel cell (PEMFC) is the key development direction. The most critical large part of PEMFC is the electric stack, and the bipolar plate is one of the two core components in the electric stack, accounting for about one-third of the cost of the electric stack. [0003] At present, the relatively mature materials for bipolar plates are pure graphite matrix and graphite composite matrix, but due to their low processability efficiency, that is, high manufacturing cost (CNC slotting), bulky, fragile, low energy density, low mechanical strength, etc. Inherent disadvantages wi...

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Problems solved by technology

However, it is based on bipolar plates made of graphite, which is not conducive to the production of complex shapes, and the production efficiency is also very low, the cost is high, and it is not used for commercial purposes.

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