Hydrogen fuel cell stack durability test system and method

Abstract

The invention belongs to the technical field of fuel cells, and discloses a hydrogen fuel cell stack durability test system and method. An input pipeline and an output pipeline of a cooling water storage tank are respectively communicated with a fuel cell stack; the middle of the input pipeline of the cooling water storage tank is communicated with a conductivity measuring instrument, a radiator and the like; a hydrogen tail gas exhaust pipeline is sequentially communicated with a hydrogen recovery pipeline, a back pressure valve and a hydrogen sensor; a cathode tail gas exhaust pipeline is connected with a tail gas analyzer to realize collection and measurement of concerned cathode tail gas components in the durability testing process; and the stack is connected with an electrochemical workstation to realize the detection of the electrochemical performance of the stack in the durability testing process. According to the invention, the durability of the stack can be comprehensively tested; hydrogen tail gas recovery is realized, and the cost is saved; an alarm can be given in time to prevent dangerous accidents; detection of the electric conductivity, the cathode tail gas components and the like of stack cooling circulating water is realized, and the influence of hydrogen-oxygen interface formation on the stack durability during starting and stopping is eliminated.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a hydrogen fuel cell stack durability test system and method Background technique [0002] At present, the closest prior art: the fuel cell test system has many patents, but it can be said that there are few systems that specifically introduce the fuel cell durability test. Most of the existing technical solutions are related to fuel cell testing. The fuel cell durability test system not only needs fuel and oxidant pipelines, but the general test system has nitrogen pipelines, but its use method is not considered from the perspective of stack durability testing. At the same time, the durability test system also needs to add devices such as exhaust gas analysis and cooling water conductivity detection. The resulting durability test system works differently. [0003] The demand for fossil fuels in the transportation industry is surging, and the environmental pollution caused b...

AI Technical Summary

Problems solved by technology

[0007] In summary, the problems in the prior art are: (1) Hydrogen cannot be recovered or the recovery effect is not good

[0008] (2) The cooling water temperature cannot be monitored and adjusted in real time, resulting in a large fluctuation range and high uncertainty in the operating temperature of the stack

[0009] (3) Not paying attention to the analysis of fuel cell exhaust gas

[0010] (4) The analysis of the fuel cell bipolar plate is ignored

[0011] (5) Ignore the impact of the hydrogen-oxygen interface in the anode flow field plate on the durability of the fuel cell when starting and stopping, or there is no specific plan for the elimination of this impact and how to conduct subsequent tests

[0013] (1) The fuel of the fuel cell usually needs to be humidified and kept pure (it is best not to have other impurities except hydrogen and humidified water), which makes it difficult to recover hydrogen. If hydrogen recovery contains a large amount of Moisture, when it passes into the fuel cell again, it is easy to cause water flooding, which has a great impact on the performance of the fuel cell

[0014] (2) From the perspective of thermodynamics and reaction kinetics, there are special requirements for the temperature of the fuel cell. If the temperature is too high, the moisture in the membrane will decrease, which is not conducive to the conduction of protons and will easily have a bad effect on the material (such as glass Chemicals, etc.), the performance of the fuel cell cannot reach a relatively good level if the temperature is too low

[0020] (5) If the durability test cycle includes the start-stop condition, the oxygen in the air will enter the anode of the fuel cell to form a hydrogen-oxygen interface during the start-stop period, and the formation of the hydrogen-oxygen interface will cause a high potential at the cathode, resulting in Reactions such as carbon corrosion and platinum particle agglomeration reduce fuel cell durability

At the same time, it is prone to starvation phenomenon of insufficient gas supply during start-up and stop, which will also aggravate the carbon corrosion of the carrier

If these two effects cannot be distinguished and controlled during start and stop, it will inevitably interfere with the test

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