Hybrid power system with vehicle-mounted fuel cells and lithium cells in direct parallel connection

Abstract

The invention discloses a hybrid power system with vehicle-mounted fuel cells and lithium cells in direct parallel connection. An output end of a fuel cell generation device is connected with an input end of a motor controller through a first switch conductive device; an output end of a lithium cell pack is connected with the input end of the motor controller through a second switch conductive device; an output end of the motor controller is connected with a motor; and a system energy management controller is respectively connected with a fuel cell controller, a lithium cell management system, the motor controller, a control end of the first switch conductive device and a control end of the second switch conductive device and used for controlling the ON and OFF of the first switch conductive device and controlling the forward ON or the backward ON or OFF of the second switch conductive device according to information obtained by the fuel cell controller and the lithium cell managementsystem. In the system, the traditional power supply mode requiring DC / DC (Direct Current / Direct Current) voltage stabilization is abandoned, the power supply efficiency is improved, the voltage fluctuation of the fuel cell generation device is shared by the lithium cell pack and the fuel cells protected.

Description

technical field [0001] The invention relates to a hybrid power system of a fuel cell vehicle, which belongs to the field of research and development of the fuel cell vehicle power system. Background technique [0002] Fuel cell vehicles have the advantages of energy saving, environmental protection, high efficiency, stable operation and no noise, etc., and have become a hot spot in the research and development of a new generation of vehicles. In recent years, fuel cell vehicle technology has made significant progress, however, there are still technical challenges in the development process of fuel cell vehicles, such as the integration of fuel cell stacks, improving the fuel processor of commercialized electric vehicles, optimizing the power of fuel cell vehicles. system etc. [0003] The power system of fuel cell vehicles is the main symbol that distinguishes them from other types of vehicles (internal combustion engine vehicles, battery pure electric vehicles and gasoline...

AI Technical Summary

Problems solved by technology

[0008] The invention provides a vehicle-mounted fuel cell and lithium battery direct parallel hybrid power system, which can avoid the reduction of system efficiency caused by the DC / DC converter in the structure of the existing fuel cell vehicle indirect parallel hybrid power system, increase the difficulty of control strategies, and reduce the fuel consumption. The battery itself brings harm, and the problem of increasing the cost of developing a high-power DC / DC converter

Images