A pemfc metal bipolar plate life testing device and method

Abstract

A PEMFC bipolar plate life testing device and method, the device includes a bipolar plate, a flow field on the pole plate, a cover plate, a bottom plate, a microporous filter membrane, a flexible counter electrode, a heating film, a gas supply device, and a simulated PEMFC environmental cycle Liquid supply device; gas channels are provided at the fluid inlet and outlet positions of the pole plate; various fluid measuring instruments are installed on the gas supply device, and the liquid supply device includes a peristaltic pump and a flow meter. When in use, cover the test flow field of the bipolar plate with a microporous filter membrane and a flexible counter electrode, cover the back with a heating film, and fix it between the cover plate and the bottom plate; After reaching the corresponding potential, it will run for a long time, and the use of the bipolar plate can be judged by detecting the ion concentration in the circulating solution. The device solves the problem that the service life of the metal bipolar plate cannot be independently evaluated, and its testing method and evaluation means are simple and practical, and can accurately judge the service life of the bipolar plate, and is suitable for widespread promotion in the life test of the metal bipolar plate.

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

Images