Dual-power supply management system and dual-power supply management method for electric vehicle

Abstract

The invention discloses a dual-power supply management system and a dual-power supply management method for an electric vehicle. The dual-power supply management system comprises a storage battery, a power electronic switch, a supercapacitor bank, a bidirectional DC-DC (Direct Current-Direct Current) converter and a digital signal processor, wherein the storage battery is connected to an inverter through the power electronic switch; the power electronic switch controls the charge, discharge and switching on or off of the storage battery under the control of an acquired PWM (Pulse Width Modulation) signal, the supercapacitor bank is connected to the inverter through the bidirectional DC-DC converter; the bidirectional DC-DC inverter is used for increasing or reducing the voltage in a positive direction and a negative position under the control of the acquired PWM signal; and the digital signal processor is connected with the storage battery, the supercapacitor bank, a motor, an accelerator, a brake and direct current buses among the inverter, the power electronic switch and the bidirectional DC-DC inverter to generate a PWM signal for controlling the power electronic switch and the bidirectional DC-DC inverter. According to the dual-power supply management system, the supercapacitor bank and the storage battery are used in parallel, and thus the defects that the storage battery is low in specific power, does not support a large current, and the like are effectively made up.

Description

Technical field [0001] The invention relates to a power management system and method for electric vehicles, and in particular to a dual power management system and method for electric vehicles. Background technique [0002] In traditional pure electric vehicles, batteries are generally used as the energy source of electric vehicles. In this case, the batteries are the only energy source and bear the entire power load of the vehicle. This structure puts forward high requirements on the cold start time of the battery, the number of resistant start cycles, and the response to load changes. In order to reduce costs and prolong life, the battery needs to work stably at low current and less frequent starting or braking, which greatly limits the power performance and energy recovery performance of pure electric vehicles such as acceleration and climbing. Summary of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present i...

AI Technical Summary

Problems solved by technology

In order to reduce costs and prolong life, the battery needs to work as stably as possible under the conditions of low current and infrequent starting or braking, which greatly limits the power performance and energy recovery performance of pure electric vehicles such as acceleration and climbing

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