Online vehicle-mounted hydrogen fuel cell impedance spectrum measuring device and measuring method

Abstract

The invention relates to an online vehicle-mounted hydrogen fuel cell impedance spectrum measuring device and method, wherein the device comprises a controllable AC source which is used for applying asinusoidal alternating signal, a battery voltage signal preceding-stage measuring circuit communicated with one single battery through a voltage signal gating circuit, a current sensor, a battery current signal preceding-stage measuring circuit connected with the current sensor, and a signal conditioning and amplifying circuit, multiple independent synchronous analog-to-digital conversion circuits, a digital signal processor and an upper computer which are connected in sequence; the signal conditioning and amplifying circuit is connected to the battery voltage signal preceding-stage measuringcircuit and the battery current signal preceding-stage measuring circuit, and the upper computer is connected with a controllable alternating current source and a voltage signal gating circuit. Compared with the prior art, the fuel cell impedance spectrum measuring device has the advantages that the miniaturization of the fuel cell impedance spectrum measuring device is realized and the reliability of the fuel cell impedance spectrum measuring device is improved by designing the battery current signal preceding-stage measuring circuit and the voltage signal gating circuit and utilizing a semiconductor device.

Description

technical field [0001] The invention relates to the field of on-line measurement of hydrogen fuel cell impedance, in particular to an on-line vehicle-mounted hydrogen fuel cell impedance spectrum measurement device and measurement method. Background technique [0002] With the energy crisis and environmental protection issues getting attention from all walks of life, clean energy and renewable energy technologies have been deeply researched and widely used. Among them, proton exchange membrane fuel cells are considered to have the potential to replace internal combustion engines and be widely used in future new energy vehicles due to their high energy density, high efficiency, and no pollutant emissions. However, there are still many problems restricting the widespread use of proton exchange membrane fuel cells in the automotive field, and the durability and life of fuel cells are one of the main aspects. Since the fuel cell system is a complex electrochemical system, the s...

AI Technical Summary

Problems solved by technology

However, in the vehicle environment, the dedicated impedance measurement equipment has defects such as large size, easy damage, and long measurement cycle, and is not suitable for real-time detection of vehicle fuel cell systems.

In addition, vehicle fuel cells are mostly composed of multiple fuel cell cells in series, while electrochemical workstations and other instruments are mostly designed for single-chip fuel cell impedance measurement, which does not meet the actual measurement needs of fuel cell systems

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