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Investigation and Development of Power Lithium-ion Battery Management System

Author: ZhuHongBo
Tutor: KangLongYun
School: South China University of Technology
Course: Vehicle Engineering
Keywords: Power Li-ion battery Electric Vehicle Battery management system State of charge Equalization circuit
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 210
Quote: 0
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Abstract


AS the petroleum crisis and environmental degration problem are becoming increasingly serious,the traditional auto industry faces severe challenges.As a way to future development of automobile,Electric Vehicle (EV) has become global research hotspot.Power battery pack is an important component of EV of which the performance deeply affects the performance of EV. Li-ion battery is an ideal battery as a energy source for EV due to its higher power density and energy density. To ensure the safty use and make the most performance of Li-ion battery pack ,efficiently management for it is absolutely necessary.The Li-ion battery pack has a high demand for the Battery Management System (BMS) because the Li-ion battery pack consists of many series-connected battery cells and the operating conditiong of battery pack is complicated.So it is very important to research and develope the power Li-ion battery pack‘s BMS, the main contents of this thesis are summarized as follow:At the beginning, the background of the project and the developments of BMS in our country and abroad are summarized. An overall scheme of battery management system is put forward,and the strategy of estimating the state of charge (SOC) is established.Secondly,the working principle and property of Li-ion battery are introduced; Some models of the battery are given. The PNGV model of Li-ion battery is builded,and the parameters of the model are calculated based on the data of Hybird Pulse Power Characterization (HPPC) test.Furthermore,the hardware of BMS is designed,which include voltage acquisition circuit﹑current acquisition circuit﹑temperature acquisition circuit and equalization circuit.A V/F convert circuit is designed for current signal to improve the precision of SOC.The most commonly use of equalization circuits are introduced and analysed,a new equalization circuit is proposed.In addition, the software system of the BMS is introduced. the design of software include main procedure, interrupt procedure and other procedures, and the flow charts of important procedures are also given.Finally, the simulations and experiments for the equalization circuit are performed,the result indicates that the equalization circuit proposed in this thesis can do gross balancing and have a higher speed of balancing compared with other equalization circuits.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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