The Integrated Magnetics Based Hybrid Energy Storage System Application In Electric Vehicles

With the development of high-energy batteries, such as lithium ion batteries and fuel cells. The highest energy density of batteries up to 300 Wh / kg. The battery composed of a battery pack can bring a huge amount of storage capacity upgrade.Now electric vehicles mileage up to 500 kilometers, could meet most people's daily use. At the same time, high electric vehicles mileage bring is costly, slow charging time, limiting the charging stations. Accounting for about 30% of the weight of the battery electric vehicle weight, making the design of the other parts of the electric car is try to reduce the size and weight. The chemical characteristics of the battery limiting its discharge rate, largely affected the fluency driving.In response to these problems of electric vehicles, proposed the hybrid energy storage system based on magnetic integration technology. The system uses a battery pack as the primary storage device, the super capacitors for auxiliary equipment,constituted the hybrid energy storage devices. And with integrated magnetic structure DC-DC converter as an energy conversion device transmission. Integrated Magnetics converter reduces the volume and weight of the magnetic member. It could improve the power transfer efficiency of the converter and filtered off and the input and output current ripple. Therefore, there can be a greater increase in hybrid energy storage system on the storage capacity, response speed, weight and volume.The proposed hybrid energy storage system is applied to electric vehicles, by the simulation analysis of Matlab simulation software and electric vehicles analysis software advisor2002. The proposed hybrid energy storage can be very good to deal with normal driving cycle through simulation. The DC side voltage fluctuation does not exceed 3.3%, while the output current ripple factor is less than 1%. By building a small laboratory equipment, applying a step change in the load side to verify the performance of the proposed hybrid energy storage system. Through comparative analysis of experiments with traditional single battery energy storage system and compared with the traditional bridge reversible chopper converter. The proposed energy storage system with the integrated magnetic structure DC-DC converter can be a good deal with a sudden step change in load. Ensure smooth output current of the battery pack, the response rate has improved so much. For the connection between the grid and the electric vehicles, make use of the large-capacity storage of electric car tostabilize the grid frequency offset. Through simulation analysis to verify the feasibility. With the escalation of future energy storage technology innovation and energy management control systems, energy storage systems will be getting to the smaller size, lighter weight, larger capacity, faster response direction.