Automobile energy feedback type active balance control system and method and electric automobile

Abstract

The invention belongs to the technical field of power batteries, and discloses an automobile energy feedback type active balance control system and method and an electric automobile. Whether the automobile is in a downhill or braking state is determined. When the automobile is in the downhill or braking state, a switch is closed, the system starts to work, energy recovery starts, wheels rotate togenerate alternating current, and the alternating current is rectified and filtered to form direct current to charge the storage battery; when the automobile needs active equalization and the voltageof a storage battery is higher than the voltage of a battery cell needing equalization, the battery cell needing charging is directly connected with the storage battery for equalization charging; whenthe voltage of the storage battery is lower than that of the battery cell, the storage battery is connected with the battery cell through a DCDC converter for charging; and if active equalization isnot needed at the moment, the electric energy is stored in a vehicle-mounted common 24V storage battery for later use. According to the invention, the energy of the automobile during downhill running,coasting, braking and high-speed running is recycled, so that the utilization rate of the energy is improved; recycled energy is actively balanced, and the balancing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a vehicle energy feedback type active balance control system, method and electric vehicle. Background technique [0002] At present, the closest existing technology: power battery is the power source that provides power source for tools, mostly refers to the battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts. It is mainly different from the starting battery used for starting the automobile engine, which mostly adopts valve-sealed lead-acid battery, open-type tubular lead-acid battery and lithium iron phosphate battery. In order to prevent the voltage gap of each cell of the vehicle power battery from being too large and affecting the service life of the battery, the battery balancing system used in the existing electric vehicle generally places a two-way DCDC converter between the power battery and the 24v bat...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the battery equalization system used in the existing electric vehicles has large switching loss and low equalization efficiency

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