【作者】 何小颤；

【导师】 罗玉涛；

【作者基本信息】 华南理工大学 ， 车辆工程， 2012， 硕士

【摘要】 随着环境问题与能源问题的日益恶化，传统汽车行业不得不向节能环保的新能源汽车行业转变。电机、动力电池、控制器等作为新能源汽车的核心技术，近年取得了突破性的进展。尤其动力电池技术的发展为新能源汽车的发展提供了一个新的平台。目前动力电池的比能量达到100-500Wh/kg，比功率达到315W/kg，寿命达到1000-2000次，基本可以满足新能源汽车的需要。铅酸动力电池、镍氢动力电池安全性较好，但比能量、比功率值不高。锂离子动力电池的比能量、比功率较高，但其热安全性仍然是制约新能源汽车产业化的一个重要因素，需要进一步的研究。目前，镍氢动力电池和锂离子动力电池为主流动力电池，故对其进行热特性研究非常必要，对新能源汽车的热管理系统（BTMS）的设计有着重要意义。动力电池的热分析主要包括热安全性、热效率和温度引起的单体电池之间的差异。主要任务是保证动力电池工作在适宜的温度范围，提高整车运行效率，同时不发生燃烧、爆炸等意外事故。本文研究的主要内容有：（1）分析了目前混合动力汽车的发展、动力电池的发展以及动力电池热特性研究现状。（2）研究了动力电池的产热原理与其影响因素，找到了研究动力电池的方法。（3）采用ANSYS商业有限元软件对国内某款锂离子动力电池进行了热分析研究。（4）分析了电池包的冷却方式，研究了电池包的冷却结构，并利用FLUENT流体分析软件进行了流体仿真。根据仿真结果，对冷却结构进行了相应的优化。（5）对分析对象进行了试验设计与试验验证。本文的研究结果对新能源汽车的热管理系统设计提供一定的理论基础，同时对电池组的结构设计提供一定的借鉴意义。更多还原

【Abstract】 With the worsening of environmental problems and energy issues, the traditionalautomotive industry has to change to the new energy automotive industry. At the same time,motor, power battery, motor controller, etc., as the core technology of new energy vehicleshave made a breakthrough in recent years. In particular, the development of batterytechnology provides a new platform for the development of new energy vehicles. Currently,the energy density and specific power of the battery can reach to100-500Wh/kg,315W/kg.In addition, its life can reach to1000-2000cycles, so the battery’s performance basicallymeets the needs of new energy vehicles. The lead-acid battery and nickel hydrogen battery,have better security than lithium battery, but their specific energy and specific power value ismuch lower than lithium battery. Poor thermal safety of lithium ion, is an important factor,which still constrains the new energy automotive industry. The lithium-ion battery isincreasingly being applied to the new energy vehicles, so the thermal characteristics of thepower battery is necessary, which also is the base of the Thermal Management System(BTMS) of new energy vehicles.Power battery’s thermal characteristics contains the thermal safety, thermal efficiencyand the difference among the cells caused by temperature. The main objective is to ensure thatthe battery is running in the appropriate temperature range, the vehicle has good performance,without occurrence of combustion explosions and other accidents. The main content of thisstudy:(1) Research the development of hybrid vehicles, the development of power battery andthe status of thermal characteristics of the power battery.(2) Analyze the principle of heat production and its influence factors of the power battery,and find out a method to analyze the power battery.(3) Study a domestic lithium-ion battery on its thermal characters by using ANSYS,a commercial finite element software.(4) Study the battery pack cooling model, design the cooling structure of the battery pack,and make a simulation by using FLUENT. (5) Design the experiment about the analytical object, and make the verification.This study results provide a theoretical basis for the thermal management system designof new energy vehicles, at the same time to provide a reference for the structural design of thebattery pack.更多还原