Online surface passivation method and device for metal plate fuel cell pile cooling chamber

Abstract

The invention discloses an online surface passivation device for a metal plate fuel cell pile cooling chamber. According to online passivation of the invention, (1) a cooling chamber of a pile is passivated without detaching the pile, so that a pile maintenance process is simplified, the maintenance cost is reduced, and commercialization is benefited; (2) the electrical conductivity at a welding position of metal bipolar plates is not influenced, and the performance output of the pile is also not influenced; (3) the corrosion of a cooling liquid to the pile and the bipolar plates is reduced; (4) a method is easy to implement; (5) an acidic passivating solution is subjected to neutralizing treatment, so that the acidic passivating solution is environmentally friendly.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a surface passivation method and device for an online metal plate fuel cell stack cooling cavity. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a clean energy conversion device that converts the chemical energy stored in hydrogen and oxygen into electricity, and the product is only water, accompanied by heat. Proton exchange membrane fuel cells have attracted much attention because of their environmental friendliness, high energy conversion efficiency and low noise. It is an effective way to transform a carbon energy society into a clean energy society. It has broad application prospects in the fields of automobile industry, backup emergency power supply, distributed power station and military affairs. [0003] The bipolar plate is one of the key components of the proton exchange membrane fuel cell. It has the functions of connecting the single cell, su...

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Problems solved by technology

[0004] Although the metal bipolar plate will form an oxide film under natural conditions, the oxide film is not dense enough. When the conductivity of the cooling liquid reaches a certain level, it will affect the performance output of the stack and even cause a short circuit of the battery. The battery short circuit phenomenon has extremely high requirements on the conductivity of the coolant, usually less than 10μS·cm -1

At present, the method of replacing the coolant or adding a deionization filter to the cooling circuit of the fuel cell power system is used to maintain the operation of the fuel cell power supply system. However, 1) frequent replacement of coolant will reduce the experience of end users, 2) ) The deionization filter is a consumable item, which will not only increase the maintenance cost, but also reduce the user experience. 3) The output performance of the system is reduced

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