Multipath parallel connection interlacing output type hybrid energy storage system and method for electric automobile

Abstract

The invention discloses a multipath parallel connection interlacing output type hybrid energy storage system and method for an electric automobile. The system comprises a battery pack, a voltage stabilization capacitor, a diode D3, a switch S, a high-power boosted circuit, a low-power boosted circuit, a super capacitor, a voltage and current sampling circuit, a controller, a reverse operational amplifier circuit and two opto-isolators. A load or a motor inverter is connected to the side of the super capacitor. The high-power boosted circuit is composed of an inductor L1, an MOS transistor SW1 and a diode D1. The low-power boosted circuit is composed of an inductor L2, an MOS transistor SW2 and a diode D2. The high-power boosted circuit, the low-power boosted circuit and the diode D3 form three-path parallel connection output of energy of the battery pack. The controller conducts parallel connection interlacing control over the high-power boosted circuit and the low-power boosted circuit and controls the switch S to be turned on and off to achieve active switching of output working modes. Through interlacing control over the two boosted circuits and active switching of the working modes, high-efficiency work of the hybrid energy storage system is achieved.

Description

technical field [0001] The invention belongs to the field of hybrid energy storage systems for electric vehicles, and relates to a multi-channel parallel interleaved output hybrid energy storage system and method for electric vehicles. Background technique [0002] In recent years, oil shortages and environmental pollution have become increasingly serious. Although the country is vigorously promoting the development of the renewable energy industry, common renewable energy sources such as wind power and solar energy are not highly utilized due to instability and other factors. The development of high-efficiency, low-emission electric vehicles is an effective measure to solve the above problems. The bottleneck in the development of electric vehicles is the energy storage system. As the current mainstream energy storage system, the battery pack has high energy density but relatively low power density. In contrast, supercapacitors have high power density but low energy densit...

AI Technical Summary

Problems solved by technology

Although some multi-mode hybrid energy storage systems have separate output circuits for energy sources, they do not consider the coordinated control of DC-DC or the realization of parallel interleaved output. The mode switching control strategy becomes complicated, and it will reduce the system efficiency, making it difficult for practical application

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