PEMFC metal bipolar plate service life testing device and method

Abstract

The invention discloses a PEMFC bipolar plate service life testing device and method. The device comprises a bipolar plate, a flow field on the bipolar plate, a cover plate, a bottom plate, a microporous filter membrane, a flexible counter electrode, a heating membrane, a gas supply device and a simulated PEMFC environment circulating liquid supply device. Gas channels are formed in fluid inlet and outlet positions of the polar plates; the gas supply device is provided with various fluid measuring instruments, and the liquid supply device comprises a peristaltic pump and a flow meter. When inuse, the bipolar plate test flow field surface is covered with the microporous filter membrane and the flexible counter electrode, and the back surface is covered with the heating membrane and fixed between the cover plate and the bottom plate; after liquid and gas simulating the PEMFC environment are introduced, the bipolar plate is polarized to the corresponding potential and then operates for along time, and the use condition of the bipolar plate is judged by detecting the ion concentration in the circulating solution. The invention solves the problem that the service life of the metal bipolar plate cannot be independently evaluated, the test method and the evaluation means are simple and practical, the service life of the bipolar plate can be accurately judged, and the device is suitable for being widely popularized in metal bipolar plate service life tests.

Description

technical field [0001] The invention relates to a life testing device for a PEMFC metal bipolar plate, in particular to a device and a method using ion detection technology as a life testing method for a stainless steel bipolar plate. Background technique [0002] Fuel cell bipolar plates are divided into cathode plate and anode plate. Due to the high temperature and acidic environment inside the fuel cell, the direct use of stainless steel bipolar plates is usually difficult to meet the requirements of the fuel cell, and surface modification is required before use. The traditional method of measuring the life of the modified metal bipolar plate is to put the bipolar plate into the fuel cell, and judge the life of the metal bipolar plate by comparing it with the life of the fuel cell with the graphite bipolar plate. This method is not only expensive, but also cannot produce graphite plates with the same flow field as metal plates in many cases, and is easily affected by the...

AI Technical Summary

Problems solved by technology

[0003] In most of the literature surveys, it was found that the failure of the bipolar plate usually manifested as the perforation of the surface modified film, which on the one hand would lead to an increase in the surface contact resistance, thereby reducing the useful power of the battery stack; on the other hand, it would lead to matrix corrosion, dissolved Metal ions can catalyze the degradation of membrane electrodes, resulting in loss of stack performance

But no matter which way it fails, it will lead to the corrosion of the substrate, which will make a certain amount of metal ions exist in the liquid environment of PEMFC

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