Cold start method and device of fuel cell stack and vehicle

Abstract

The invention discloses a cold start method and device for a fuel cell stack and a vehicle, and the method comprises the steps: after shutdown purging is completed, introducing hydrogen into an anode inlet of the stack based on a first preset parameter, and introducing oxygen into a cathode inlet of the stack. And if it is detected that the minimum voltage and the average voltage of the batteries in the galvanic pile meet a first preset condition, loading a first current to the galvanic pile step by step according to a preset current density gradient. And if the detected minimum voltage and the average voltage meet a second preset condition, introducing hydrogen into the anode inlet of the galvanic pile based on a second preset parameter, introducing oxygen into the cathode inlet of the galvanic pile, and loading a second current with the target current density value to the galvanic pile. And if the detected minimum voltage and the average voltage meet a third preset condition and the detected temperature of the cooling liquid outlet of the electric pile is within a preset temperature range, finishing cold start of the electric pile. According to the method, a heating auxiliary device is not needed, and the problem of low-temperature cold start of the stack can be solved by a simpler structure.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cold start method, device and vehicle of a fuel cell stack. Background technique [0002] A proton exchange membrane fuel cell is a power generation device that uses hydrogen as fuel to directly convert chemical energy into electrical energy. Fuel cells have the advantages of high energy density, fast start-up speed, low operating temperature, and non-polluting products, which make them have potential application value in the field of new energy vehicles. The structure of the fuel cell stack is usually stacked by hundreds of membrane electrodes, bipolar plates and seals, and the fastening force is exerted by the end plates, insulating plates and collector plates on both sides to form a fuel cell stack. Then, the fuel cell stack is packaged and integrated into a fuel cell stack module through high-voltage copper bars, high-voltage penetration terminals, voltage detectors, hy...

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Problems solved by technology

[0004] However, the existing cold start method of the stack needs to use external heating tools, or increase the external power supply and control circuit to realize the cold start of the fuel cell, which will lead to the complexity of the fuel cell system and increase the space and cost of the system

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