Full-immersion type self-circulation evaporative cooling vehicle-mounted fuel cell system and working method thereof

Abstract

The invention discloses a full-immersion type self-circulation evaporative cooling vehicle-mounted fuel cell system, belonging to the field of clean energy application and transportation traffic. The system comprises a metal sealing box, a fuel cell stack, a liquid level supply device and a hydrogen storage tank, wherein the upper part and the top part of the metal sealing box are of heat dissipation structures; the liquid level supply device comprises a medium expansion compensation box and a first exhaust valve; and the bottom of the medium expansion compensation box is connected with the side face of the upper portion of the metal sealing box. According to the invention, the expansion liquid level supplementing device can supplement a liquid level in the metal sealing box so as to ensure a full immersion state in the metal sealing box and can also absorb expansion of the evaporative cooling medium in the cold and hot states of the fuel cell stack. The invention further relates to a working method of the full-immersion type self-circulation evaporative cooling vehicle-mounted fuel cell system.

Description

technical field [0001] The invention relates to the fields of clean energy application and transportation, more specifically, it is a full-immersion self-circulation evaporative cooling vehicle-mounted fuel cell system. The invention also relates to the method of operation of such an on-board fuel cell system. Background technique [0002] At present, hydrogen fuel cell vehicles mostly use 35Mpa or 70Mpa hydrogen storage tanks, two or more (heavy-duty trucks or large buses) are connected in parallel, and are connected to the hydrogen input port of the fuel cell device through pipelines; the above-mentioned vehicle-mounted fuel cells generate hydrogen or oxygen Possibility of leakage; when hydrogen leaks, it can only be quickly discharged into the atmosphere, so there are very high requirements for the layout of fuel cells, anti-static and open flames. Specific limitations are: [0003] 1) For vehicle-mounted fuel cells, the main dangerous feature is the leakage of various ...

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Problems solved by technology

[0003] 1) For vehicle-mounted fuel cells, the main dangerous feature is the leakage of various sealing passages caused by the reduction of the compacting force of the stack or the aging of the seals, which will cause the mixing of hydrogen and air, resulting in the risk of explosion; therefore, from the fuel cell For safety considerations, overpressure relief devices, collision sensors, overcurrent and overtemperature protection, etc. must be installed to fully ensure the safety of the fuel cell stack

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