Composite electric flywheel and fuel battery energy storage system

Abstract

The invention discloses a composite electric flywheel and fuel battery energy storage system, and belongs to the field of vehicle-mounted energy of electromobiles. The system is characterized in thatthe requirements of a vehicle for high-energy density, high-power density, high system efficiency and long service life of a vehicle-mounted energy storage device can be considered. Under the startingworking conditions of the vehicle, the high-power density advantage of a flywheel battery is utilized for compensating for the disadvantage of long starting time of a fuel battery; under the medium-high driving requirement power, the composite energy storage system works in a dual-energy supply mode, the high-power density advantage of the flywheel battery is utilized, not only can the power requirement of the whole vehicle be met, but also high current discharge of the fuel battery can be avoided, the service life of the fuel battery is prolonged, and the system work efficiency is improved;under the low driving requirement power, an electric flywheel does not participate in driving of the whole vehicle, and a whole vehicle controller moderately controls a flywheel speed adjusting motorto improve the efficiency of the composite energy system; under the braking conditions, the instantaneous high-power feedback advantage of the flywheel battery is utilized, the braking energy of the whole vehicle can be fed back, and the energy utilization efficiency of the whole vehicle is improved.

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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