A composite energy storage system based on electric flywheel, fuel cell and lithium battery

Abstract

A composite energy storage system based on an electric flywheel, a fuel cell and a lithium battery is characterized in that it can meet the requirements of high energy density, high power density, high efficiency and long service life of the vehicle for the energy storage system. Under the starting condition of the vehicle, the advantage of the high power density of the flywheel battery and lithium 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 advantage of the high power density of the flywheel battery and lithium battery can not only meet the power demand of the whole vehicle , and can prevent high-current discharge of the fuel cell, prolong its service life, and improve system efficiency; under braking conditions, with the help of the high power feedback advantages of flywheel batteries and lithium batteries, all or part of the braking energy of the vehicle can be fed back, improving Vehicle energy efficiency.

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, a fuel cell and a lithium battery. Background technique [0002] Compared with lead-acid batteries and nickel-metal hydride batteries, lithium batteries have become the mainstream energy source of electric vehicles due to their moderate energy density and power density, but the existing lithium battery technology still cannot effectively improve the driving range of electric vehicles; fuel Batteries have the advantages of large energy and environmental protection, and have been valued by domestic and foreign automobile manufacturers and research institutions. However, the low power density and long start-up characteristics of fuel cells affect their popularization and application in the field of electric vehicles; electric flywheel batteries With the advantages of high power density and high energy conversion eff...

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Problems solved by technology

[0002] Compared with lead-acid batteries and nickel-metal hydride batteries, lithium batteries have become the mainstream energy source of electric vehicles due to their moderate energy density and power density, but the existing lithium battery technology still cannot effectively improve the driving range of electric vehicles; fuel Batteries have the advantages of large energy and environmental protection, and have been valued by domestic and foreign automobile manufacturers and research institutions. However, the low power density and long start-up characteristics of fuel cells affect their popularization and application in the field of electric vehicles; electric flywheel batteries With the advantages of high power density and high energy conversion efficiency, it can realize instantaneous high-power driving or braking. It is an ideal power energy storage component. However, the energy density of electric flywheels is low, and the ability of continuous energy release or feedback poor

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