Fuel cell system, control method, vehicle-mounted power supply system and vehicle

Abstract

The invention provides a fuel cell system, a control method, a vehicle-mounted power supply system and a vehicle. Multiple fuel cell stacks are integrated in the fuel cell system. All the fuel cell stacks are connected in parallel. The output end of each fuel cell stack is connected with the low voltage end of a DC / DC converter through a corresponding control switch. The high voltage end of the DC / DC converter is connected with a power cell load. When the fuel cell system is in the idling condition and the state of charge of the power cell is high, the controller controls the corresponding fuel cell stack to shut down and cut off the current output according to the power demand of the load so that the fuel cell stack in the working state can generate electricity with the power higher thanthe electrochemical polarization curve. The fuel cell stacks can be effectively prevented from working in the electrochemical polarization region under the idling condition of the fuel cell system sothat the service life of the fuel cell is improved and the performance attenuation rate of the fuel cell system is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell systems, and in particular relates to a fuel cell system, a control method, a vehicle power supply system and a vehicle. Background technique [0002] Under the dual pressure of energy and environment, fuel cell vehicles have become the direction of the future development of the automobile industry and the focus of research in the field of automobiles. A fuel cell vehicle is a vehicle powered by electricity generated by an on-board fuel cell device. The fuel used by the vehicle-mounted fuel cell device is high-purity hydrogen or hydrogen-containing reformed gas obtained by reforming hydrogen-containing fuel. Compared with ordinary electric vehicles, the difference in power is that the power used by fuel cell vehicles comes from on-board fuel cell devices, and the power used by electric vehicles comes from batteries charged by the grid. A fuel cell is a high-efficiency power generation device t...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a fuel cell system, a control method, an on-board power supply system and a vehicle, which are used to solve the problem of the fuel cell system in the prior art when the fuel cell is in an idle state and the state of charge of the energy storage element is relatively high. Attenuation and Performance Degradation Issues

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