Fuel cell online life detection method, system and device for new energy vehicles

Abstract

The invention relates to a fuel cell on-line service life detection method, system and device of a new energy automobile. The method specifically includes the following steps that the cell temperature, the cell hydrogen gas parameter, the cell air parameter, the current value and the voltage value of a fuel cell at the current moment are acquired in real time; the ideal open circuit electromotiveforce at the current moment is calculated according to the cell temperature, the cell hydrogen gas parameter and the cell air parameter; the concentration difference loss electromotive force and the polarization loss electromotive force are obtained through calculation according to the current value, the voltage value and the ideal open circuit electromotive force; and according to the concentration difference loss electromotive force and the polarization loss electromotive force, the current direct current internal resistance of the fuel cell is calculated, and the health state index of the fuel cell is obtained. Compared with the prior art, the method, system and device are suitable for a fuel cell power system applied to the automobile, single-body health state information of the fuel cell can be quickly and conveniently obtained, the calculation process is simple and quick, automobile-rule-level controller software is embedded conveniently, and the service life of the fuel cell canbe detected accurately in real time.

Description

technical field [0001] The invention relates to the detection field of fuel cells, in particular to a fuel cell online life detection method, system and device for new energy vehicles. Background technique [0002] Fuel cell single life detection is very important in the use of fuel cells and is an important parameter of fuel cells. The internal state of the long-term running fuel cell may be very different from the initial working state. If the life state of the fuel cell cannot be obtained, the effective control of the system will be lost after the long-term operation of the battery, which will seriously affect the reliability and durability of the fuel cell system. The current research on the life state of the fuel cell mainly focuses on how to obtain accurate internal parameters of the monomer online. The methods for obtaining the internal resistance parameters of the battery are mainly AC impedance spectroscopy, cyclic voltammetry, and current-off method, but these meth...

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Problems solved by technology

The internal state of the long-term running fuel cell may be very different from the initial working state. If the life state of the fuel cell cannot be obtained, the effective control of the system will be lost after the long-term operation of the battery, which will seriously affect the reliability and durability of the fuel cell system.

The current research on the life state of the fuel cell mainly focuses on how to obtain accurate internal parameters of the monomer online. The methods for obtaining the internal resistance parameters of the battery are mainly AC impedance spectroscopy, cyclic voltammetry, and current-off method, but these methods are all in the laboratory. Acquisition, cannot be accurately and conveniently applied to new energy vehicles, and there are problems such as high cost and low accuracy

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