Electric vehicle energy management system and method thereof based on hybrid stored energy

Abstract

The invention provides an electric vehicle energy management system and a method thereof based on hybrid stored energy, namely, an electric vehicle energy management system based on hybrid stored energy of solar energy, a lithium battery and a super capacitor and a method thereof. Every two of a solar-cell panel, a boost converter, the lithium battery and a hub motor are electrically connected in sequence; the super capacitor is connected with a bidirectional DC (direct current) / DC converter and then connected to the lithium battery; a corresponding MPPT (maximum power point tracking) algorithm is operated in accordance with light conditions (the lights change quickly when the electric vehicle runs and the lights are even or shielded partly when the electric vehicle stops) of the solar-cell panel, thus a solar cell always outputs the maximum power; by controlling the bidirectional DC / DC converter, the super capacitor can output large currents instantly so as to meet the high-power requirement of a load, thereby improving the uphill performance and the acceleration performance of the electric vehicle; the super capacitor can absorb regenerative braking feedback energy, thus improving the energy utilization rate of the electric vehicle; the super capacitor outputs and absorbs the large currents instantly, thus a stored energy battery is more stable in charge-discharge current, thereby avoiding being impacted by load currents and prolonging the service life of the stored energy battery.

Description

technical field [0001] The invention relates to an electric vehicle energy management system, in particular to an electric vehicle energy management system based on hybrid energy storage and a method thereof. Background technique [0002] With the continuous growth of global automobile production and ownership, the problems that automobiles have brought to human beings have become increasingly prominent, such as exhaust emissions, noise pollution, and fuel consumption. Electric vehicles have the characteristics of zero emission, low noise, and comprehensive utilization of energy. They are environmentally friendly and energy-saving green vehicles, and have very broad development prospects. However, the limited energy storage capacity, low energy utilization rate, and insufficient cruising range of electric vehicles directly restrict the development of electric vehicles. [0003] As a clean and environmentally friendly energy source, solar energy has attracted widespread atte...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide an electric vehicle energy management system based on hybrid energy storage and its method, which overcomes the shortage of energy sources of traditional electric vehicles, poor battery life, and short battery life. , poor operating performance and other shortcomings, the use of solar energy, lithium batteries and super capacitors for hybrid energy storage not only improves energy utilization, increases cruising range, but also slows down the impact of large load currents and braking currents on lithium batteries , prolong the battery life, and also improve the output power level of the power system in a short time

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