Fuel cell stack durability acceleration test method and durability acceleration test device

Abstract

The invention belongs to the technical field of fuel cell detection, discloses a fuel cell stack durability acceleration test method and a durability acceleration test device, and aims to solve problems that the existing test method cannot realize the function of rapidly increasing or reducing the temperature of a stack during acceleration working condition test and the influence of rapid change of the working temperature of the electric pile on the durability cannot be considered. a multi-nozzle hydrogen ejector is adopted to control anode reaction gas supply, and an air flow controller is combined with a control strategy to control cathode reaction gas supply; and the working temperature of the fuel cell stack and the reaction gas supply temperature under the accelerated aging working condition are adjusted and controlled in real time by using a temperature control system. And a durability acceleration test result of the fuel cell stack is obtained through the control process. According to the invention, the functions of reaction gas supply and rapid adjustment of the working temperature of the stack under the accelerated aging working condition are realized, so that the fuel cell stack durability accelerated test system can be used for accelerated aging test, and an accurate test result is obtained.

Description

technical field [0001] The invention belongs to the technical field of fuel cell detection, and in particular relates to a fuel cell stack durability accelerated test method and a durability accelerated test device. Background technique [0002] At present, fuel cells have the advantages of no pollution, high energy conversion efficiency, fast start-up speed, small vibration during work, and lower operating temperature than internal combustion engines. However, fuel cells also have difficulties that limit their commercial application. One of the most critical issues is the life of fuel cells, that is, durability. Through various durability tests on fuel cell stacks, we can well understand the life of fuel cell stacks and the mechanism of durability decay, and contribute to increasing the life of fuel cell stacks. The durability test of fuel cell stacks is extremely time-consuming. Generally speaking, thousands of hours of measurement are required, and it also consumes manpo...

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Problems solved by technology

[0005] (1) The durability test of the fuel cell stack is extremely time-consuming. Usually, thousands of hours of measurement are required, and it also consumes manpower and material resources, which brings great limitations to the durability test of the fuel cell stack.

When the existing fuel cell stack test system and device are used for the accelerated test of the stack, there are problems of delayed and untimely supply of the reaction gas, and it takes a long time for the temperature control and adjustment when the stack temperature needs to change greatly. Inaccurate Heap Endurance Accelerated Test Results

[0006] (2) The existing stack test system and method are mainly aimed at the steady-state performance test. When used for the durability test of the constant current stack, the working parameters such as the reaction gas flow rate, working temperature, working pressure, and intake humidity are stable, and can be easily Well-controlled, when used in the durability test of dynamic working conditions, the above working parameters will have transient changes, which will affect the performance of the stack, and then affect the durability test results of the stack. In the case of the accelerated durability test of the stack, the current There are test systems and methods that cannot meet the requirements for rapid response to operating parameters, and the durability test results cannot fully reflect the impact of accelerated conditions on the durability of the stack, especially when the existing test systems and methods cannot achieve accelerated conditions. For the function of the rapid increase or decrease of the stack temperature, the impact of the rapid change of the operating temperature of the stack on the durability cannot be considered, and this function is required for future accelerated test research on the durability of the stack

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