Energy-storage management system based on range-extended vehicle

Abstract

The invention provides an energy-storage management system based on a range-extended vehicle, and relates to the technical field of vehicle energy management. The energy-storage management system comprises a range extender unit set, an energy storage unit and a distributed energy management unit. The range extender unit set includes a plurality of range extender units, and is used for converting fossil energy or other kinds of internal combustion engine energy into electric energy. The energy storage unit is used for supplying power to a vehicle load and recovering the braking energy of the vehicle, and comprises a super-capacitor energy storage unit and a power battery energy storage unit. A first preset electric quantity value is set in the energy storage unit. The distributed energy management unit is configured to coordinately control the range extender unit set and the energy storage unit to provide a power source for the vehicle according to the load demand power of the vehicle and the charge state of the energy storage unit. According to the energy-storage management system, the energy conversion efficiency of the vehicle and the service life of a power battery are greatly improved and prolonged separately.

Description

technical field [0001] The invention relates to the technical field of vehicle energy management, in particular to an energy storage management system based on an extended-range vehicle. Background technique [0002] Electric vehicles have the problems of short driving range and long charging time, and the emergence of extended-range electric vehicles has effectively made up for this deficiency. At present, the vehicle energy source of a range-extended vehicle generally consists of a range extender and a power battery. However, the power battery capacity of a range-extended vehicle is often small. When the range-extender starts to work, limited by the changes in the vehicle’s operating conditions and the response characteristics of the range-extender, the output power of the range-extender and the vehicle’s demanded power cannot be synchronized in real time, resulting in battery charging The discharge condition is relatively frequent, and the battery is prone to repeated im...

AI Technical Summary

Problems solved by technology

However, the power battery capacity of a range-extended vehicle is often small. When the range-extender starts to work, limited by the changes in the vehicle’s operating conditions and the response characteristics of the range-extender, the output power of the range-extender and the vehicle’s demanded power cannot be synchronized in real time, resulting in battery charging The discharge condition is relatively frequent, and the battery is prone to repeated impacts of large currents, which reduces the service life of the power battery

When the vehicle brakes for energy recovery, the power battery often bears a greater current impact. Limited by the physical characteristics of the power battery body, frequent charging and discharging conditions are likely to cause the battery pack to overheat, which not only affects the energy conversion efficiency, but also requires The extra energy cools the power battery, which in turn affects the vehicle's energy efficiency

In addition, the power battery is in the condition of frequent charging and discharging of high current for a long time, which will also have an adverse effect on the life of the power battery

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