An electric flywheel and fuel cell composite energy storage system

Abstract

An electric flywheel and fuel cell composite energy storage system belongs to the field of vehicle-mounted energy for electric vehicles, and is characterized in that it can meet the requirements of high energy density, high power density, high system efficiency and long service life of vehicle-mounted energy storage devices. Under the starting condition of the vehicle, the advantage of the high power density of the flywheel battery can make up for the disadvantage of the long start-up time of the fuel cell; under the medium and high driving power demand, the composite energy storage system works in the dual energy supply mode, and with the advantage of the high power density of the flywheel battery, it can not only Meet the power requirements of the vehicle, and prevent the fuel cell from high-current discharge, prolong its service life, and improve system efficiency; under low drive power requirements, the electric flywheel does not participate in the drive of the vehicle, and the vehicle controller controls the speed of the flywheel motor. Timely control is carried out to improve the efficiency of the composite energy system; under braking conditions, with the advantage of instantaneous high power feedback of the flywheel battery, the braking energy of the whole vehicle can be fed back to improve the energy utilization efficiency of the whole vehicle.

Description

technical field [0001] The invention relates to a composite energy storage system, in particular to a composite energy storage system based on an electric flywheel and a fuel cell. Background technique [0002] At present, compared with lead-acid batteries, nickel-metal hydride batteries, and lithium batteries, fuel cells directly convert hydrogen energy into electrical energy, which has the characteristics of high efficiency, environmental protection, and large energy existence. It is regarded as an effective way to solve the problems of resource shortage and environmental pollution. . However, the technical solution of using fuel cells as vehicle energy systems has the following disadvantages: 1) Compared with lead-acid batteries, nickel-metal hydride batteries, and lithium batteries, fuel cells have start-up characteristics, and there is a start-up time period, which affects vehicle start-up and acceleration 2) The power density of the fuel cell is low. For the load cond...

AI Technical Summary

Problems solved by technology

However, the technical solution of using fuel cells as vehicle energy systems has the following disadvantages: 1) Compared with lead-acid batteries, nickel-metal hydride batteries, and lithium batteries, fuel cells have start-up characteristics, and there is a start-up time period, which affects vehicle start-up and acceleration 2) The power density of the fuel cell is low. For the load condition with a sudden load change, the high current discharge of the fuel cell will affect its working efficiency and service life; 3) The fuel cell can only realize energy output and cannot feed back the vehicle braking energy, which is not conducive to improving vehicle energy utilization efficiency

However, the energy density of the electric flywheel is relatively low, and the ability of continuous energy release or feedback is poor

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