Brake energy recovery system and method of electric vehicle

Abstract

The invention discloses a brake energy recovery system and method of an electric vehicle. The brake energy recovery system of the electric vehicle comprises an energy conversion unit, an inverting unit, an energy storage unit and an energy storage unit management system, wherein the energy conversion unit is used for converting mechanical energy generated during braking into electrical energy and converting the electrical energy into the mechanical energy for driving a vehicle during driving; the inverting unit is connected with the energy conversion unit and used for inverting between alternating current and direct current; the energy storage unit is used for receiving the electrical energy generated by the energy conversion unit and can provide the electrical energy; the energy storage unit management system is connected between the inverting unit and the energy storage unit and used for controlling charge and discharge of the energy storage unit; and the energy storage unit comprises a super-capacitor energy storage unit and a chemical battery energy storage unit, wherein the super-capacitor energy storage unit is connected with the chemical battery energy storage unit in parallel through the energy storage unit management system. Through the system and method disclosed by the invention, the brake energy recovery efficiency can be improved, and the service life of the battery can be prolonged.

Description

technical field [0001] The invention belongs to the field of electric vehicle energy recovery, in particular to an electric vehicle braking energy recovery system and an energy recovery control method. Background technique [0002] With the depletion of fossil resources such as oil and the increasingly serious environmental pollution, new energy vehicles are being promoted more and more. Various traditional vehicle manufacturers are also rushing to launch their own electric vehicles or hybrid models. Electric vehicles not only use clean electric energy to drive the vehicle, but also recover and reuse the energy generated during braking. At present, vehicles with braking energy recovery systems mostly charge the battery directly with the electric energy recovered by the motor (such as Chinese Patent Publication No.: CN10159043), but the charging capacity of the battery is generally low at present, and the braking recovery current is often very large. Therefore, the battery ...

AI Technical Summary

Problems solved by technology

At present, vehicles with braking energy recovery systems mostly charge the battery directly with the electric energy recovered by the motor (such as Chinese Patent Publication No.: CN10159043), but the charging capacity of the battery is generally low at present, and the braking recovery current is often very large. Therefore, the battery cannot fully recover the energy generated during braking, and it will also shorten the service life of the battery.

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