Internal resistance test system and method of fuel cell stack

Abstract

The invention discloses an internal resistance test system and method of a fuel cell stack. The internal resistance test system comprises a stack module, a current and voltage sensor, an impedance controller, a heating resistor, a master controller and an upper computer, wherein the heating resistor, the impedance controller and the stack module are connected in series, the heating resistance is used for providing a hot radiation source for the stack module, the impedance controller is used for sending a PWM square wave signal to the stack module and is used for providing different input excitation voltages for the stack module, the sensor is arranged on the stack module and is used for measuring voltages and currents of two ends of the stack module, and the sensor, the impedance controller and the upper computer are in communication connection with the master controller. By the internal resistance test system, the internal resistance of the fuel cell can be safely and rapidly monitored in real time, and the wet condition of a proton exchange film is further judged according to the size of the internal impedance of the fuel cell; and moreover, the internal resistance test system isconvenient to operate and simple to calculate, is high in safety and is suitable for on-line real-time monitoring, and the test required time frame is easy to implement.

Description

technical field [0001] The invention relates to the field of fuel cell power generation devices, in particular to a fuel cell stack internal resistance testing system and method. Background technique [0002] A fuel cell is a device that converts chemical energy in fuel into electrical energy. The membrane electrode is the core of the fuel cell engine. At the anode of the membrane electrode, hydrogen gas penetrates the porous material, and an electrochemical reaction occurs on the surface of the catalyst, losing electrons. , and become positively charged ions. Positive ions can migrate through the proton exchange membrane and reach the cathode at the other end of the membrane electrode. At the cathode of the membrane electrode, oxygen can be obtained by electrochemical reaction on the surface of the catalyst by penetrating the porous material. electrons to form negative ions. The negative ions formed at the cathode end react with the positive ions migrating from the anode e...

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Problems solved by technology

[0004] There are still some deficiencies in the existing technology: (1) electrochemical impedance spectroscopy, which measures the internal impedance of the fuel cell, the test time of this method is very long, the impedance parameter fitting process is cumbersome, and it is not suitable for online real-time testing; (2) cut-off It is very dangerous and difficult to measure the internal impedance of the fuel cell by using the current method, and it is not suitable for online real-time monitoring.

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