Device and method for online impedance spectrum measurement of vehicle-mounted hydrogen fuel cell

A device for online impedance spectrum measurement of a vehicle-mounted hydrogen fuel cell, comprising:

• a controllable alternating current source, connected to two ends of the fuel cell and configured to apply a sinusoidal alternating signal;
• wherein the fuel cell comprises a plurality of monocells;
• a cell voltage signal preceding-stage measuring circuit, connected to two ends of each monocell of the fuel cell via a voltage signal gating circuit, and configured to select, by the voltage signal gating circuit, to communicate with one monocell;
• a current sensor and a cell current signal preceding-stage measuring circuit connected with the current sensor, wherein the current sensor is connected to an output DC bus of the fuel cell and configured to measure an output DC bus current of the fuel cell;
• and
• a signal conditioning and amplifying circuit, a multi-channel simultaneous sampling analog-digital conversion circuit, a digital signal processor and an upper computer, which are connected in sequence, wherein the signal conditioning and amplifying circuit is connected to the cell voltage signal preceding-stage measuring circuit and the cell current signal preceding-stage measuring circuit, separately;
• and the upper computer is connected with the controllable alternating current source and the voltage signal gating circuit.