主動式雙向DC-DC電池均衡器的設計
[Abstract]:The problems of environmental pollution and energy crisis have gradually become two difficult problems in the 21st century. With the improvement of people's environmental awareness and the support of the government, electric vehicles are favored by the market for their energy saving and environmental protection characteristics. Will lead the future direction of the development of the automotive industry. Battery as the core part of electric vehicle, its development status determines the possibility of further development of electric vehicle. Because of the technical limitation, the battery of electric vehicle is composed of several single cells in series. Because of the inconsistency of the cell's monomer performance, and the serious overcharge and overdischarge phenomenon during the period of use, the electric vehicle's power cell is made up of several single cells in series. The battery life will be greatly affected, so the battery equalization technology is very important for the development of electric vehicle industrialization. It is a way to solve the problem of battery life damage by applying the cell equalization technology to the charging post to ensure the safety and effectiveness of each charge of the battery pack. The latest data at home and abroad show that the non-dissipative equalization technology is the focus of the current equalization technology, which has presented the status quo of circuit structure diversification and control method diversification. However, many equalization methods only focus on theoretical research and do not fully take into account the variation of parameters in the actual operating environment of the battery pack. In addition, the proposed partial equalization control strategy is often difficult to be applied in practice because of the complexity of calculation. Based on the deep analysis of domestic and foreign research on power battery pack equalization technology, this paper presents a design method of active bidirectional DC-DC battery equalizer under the condition of incomplete charging and overcharging often occurring in electric vehicle charging. The method can be used to fully charge the lithium battery pack and equalize the battery pack of 24 lithium cells. The battery equalization system is composed of two parts: the main circuit and the controller. First, the circuit design of the equalization main circuit and controller is described in detail. The design method of power supply circuit, power supply monitor circuit, DSP peripheral circuit, SPI module and CAN module are discussed in order to design the battery equalizer of product level. The equalization controller takes DSP as the control core and the voltage acquisition module of LTC6804-2 of Lingliert Company. Secondly, a complete scheme from cell voltage monitoring to single cell voltage equalization is designed, and an effective equalization strategy and SOC estimation algorithm are designed. Then, the simulation model of battery equalization system is established, and the equalization scheme is verified by simulation. Finally, the prototype of the battery equalizer is developed, and the EMC, high and low temperature tests and functional tests are carried out to verify the validity and reliability of the whole system design.
【學位授予單位】:東華大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM912
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