Method and device for testing liquid water tolerance of cathode and anode of fuel cell stack

Abstract

The invention discloses a fuel cell stack cathode and anode liquid water tolerance testing device and method. The fuel cell stack cathode and anode liquid water tolerance testing device comprises a rate adjusting assembly and a voltage measuring instrument, an outlet of the rate adjusting assembly is communicated with a target flow channel of the to-be-measured fuel cell stack and is used for outputting liquid water to the target flow channel; the voltage measuring instrument is electrically connected with each single cell in the fuel cell stack to be measured and is used for measuring the voltage of each single cell; and when the index measured by the voltage measuring instrument reaches a cut-off point, the rate of outputting the liquid water by the rate adjusting assembly is the maximum tolerance rate of the liquid water of the fuel cell stack to be measured. According to the method, the liquid water is directly injected into the target flow channel, and the maximum tolerance rate of the liquid water of the fuel cell stack is obtained, so that the liquid water tolerance test result of the fuel cell stack is quantified, and guidance is provided for the design and structure optimization of the fuel cell stack.

Description

technical field [0001] The invention relates to the technical field of fuel cell stack liquid water tolerance testing, in particular to a fuel cell stack anode and cathode liquid water tolerance testing method and device. Background technique [0002] During the operation of a fuel cell stack (hereinafter referred to as "stack"), the internal water content has an important impact on its performance. In the existing methods for testing the water content of the stack, the method of high-frequency impedance test combined with the inspection of the stack voltage is mostly used to monitor the water content inside the stack, and then reflect the water content in the stack. [0003] The above method is based on the passive monitoring of the stack under normal operating conditions, and its disadvantage is that the tolerance limit of the stack to liquid water cannot be obtained. When the stack is running, the liquid water content in the cathode and anode channels has an important im...

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Problems solved by technology

[0003] The above method is based on the passive monitoring of the stack under normal operating conditions, and its disadvantage is that it cannot obtain the tolerance limit of the stack for liquid water

When the stack is running, the liquid water content in the cathode and anode channels has an important impact on the performance of the stack. When the liquid water content is high, the output performance of the stack will fluctuate, and in severe cases, it will cause reverse polarity.

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