Double-source energy system of battery electric vehicle, power supply control method, fast charging method and slow charging method

Abstract

The invention discloses a double-source energy system of a battery electric vehicle. The double-source energy system comprises an energy management controller, a lithium battery management system, a super-capacitor management system, a lithium battery, a super-capacitor bank, a bidirectional DC / DC module, a unidirectional DC / DC module, a motor controller, a motor and the like, wherein the energy management controller is connected with the lithium battery management system, the super-capacitor management system, the bidirectional DC / DC module, the unidirectional DC / DC module and the motor controller, the lithium battery is connected with the lithium battery management system and the bidirectional DC / DC module, the bidirectional DC / DC module is connected with the motor controller and the unidirectional DC / DC module through a direct-current bus, the super-capacitor bank is connected with the super-capacitor management system, the super-capacitor bank is connected with the motor controller and the unidirectional DC / DC module, and the unidirectional DC / DC module is connected with an auxiliary power supply device. The double-source energy system of the battery electric vehicle is enhanced in load adaptability by combining high energy density of the lithium battery with high power density of super-capacitors.

Description

technical field [0001] The invention relates to a pure electric vehicle dual-source energy system, a power supply control method, a fast charging method and a slow charging method. Background technique [0002] With the increasing emphasis on clean energy in the country and the world, power batteries have been widely used in the field of electric vehicles as the protagonist. The existing electric vehicles are mainly divided into pure electric vehicles, hybrid electric vehicles and fuel cell electric vehicles. Three types. Because pure electric vehicles have the advantages of saving oil resources and environmental protection, they are considered to be the future of the automobile industry. At present, the common pure electric vehicle power supply system is mainly powered by a single power supply, and mainly uses secondary power sources such as lead-acid batteries, lithium batteries, and super capacitors as the power supply. [0003] Supercapacitors are physical energy stora...

AI Technical Summary

Problems solved by technology

However, the energy density of supercapacitors is lower than that of lithium batteries, about 10-20% of lithium batteries, and the cost of supercapacitors is generally more than 10 times that of lithium battery systems.

Under the same energy demand conditions, its volume and weight are much larger than lithium battery packs, so pure supercapacitor buses have problems such as high cost, high quality, and short cruising mileage.

Lithium batteries have the advantage of high energy density, so pure lithium battery buses have the advantage of longer cruising mileage, but because lithium batteries have higher requirements for storage and use environment temperature, charge and discharge rate, etc., there is also safety Poor, poor adaptability and other issues

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