【作者】 辛乃龙；

【导师】 刘宏伟；

【作者基本信息】 吉林大学 ， 车辆工程， 2012， 硕士

【摘要】 我国一直在着手电动汽车相关技术的研发，通过国家863计划的的研发支持，我国电动汽车行业取得了快速发展，不仅攻克了一系列关键技术，而且自主研发的电动汽车整车产品已实现小批量生产，并进入市场销售环节，在某些技术领域已实现了与日美欧等国家同步发展。但是对于电动汽车特别是纯电动汽车的动力电池来说，在生产环节和使用环节还没有完善、全面的检测系统和管理系统。目前市场上能够买到的电池管理系统（BMS）具备数据采集模块、数据显示模块、高压和低压保护模块和电池荷电状态（SOC）估算与显示模块等，但是电池热管理模块还没有加到电池管理系统中去，因此有必要研究电池组的热管理系统，使电池组中各单体电池之间的温度差异较小，温度分布较均匀，改善动力电池的电化学性能，提高电池的充放电能力和使用寿命，使BMS的功能更加完善。本文结合吉林省科技厅科技发展计划项目“纯电动高档商务客车研制”，以纯电动汽车用磷酸铁锂动力电池为研究对象，运用实验和仿真相结合的方法对电池组的生热温度场和散热温度场进行研究，为温控电池箱的整体设计提供技术支持。本文的主要研究内容可以概括如下：1.锂离子电池的热特性分析。通过分析锂离子电池的工作原理、结构和电化学特性，研究锂离子电池的生热机制，找出影响锂离子电池温度特性的因素，建立电池温升和环境温度之间的对应关系，确定了电池组放电效率的最佳温度区间。2.锂离子电池组的生热温度场仿真分析。首先建立锂离子电池的热效应模型和生热速率模型，然后对电池热模型的导热系数、比热容和密度等参数进行计算，最后确定了热模型的初始条件和边界条件，实现了生热温度场的仿真，得到了电池组生热后的温度分布。3.锂离子电池组的散热温度场仿真分析。首先介绍了各种传热介质的优缺点，确定了空气冷却的散热方式，同时采用并行通风的散热结构。然后分析了空气的流动方式，建立起了电池-空气的流固耦合模型。最后通过设置求解器方式和边界条件完成了电池组散热温度场的仿真，为温控电池箱的初步设计做出理论分析。4．完成温控电池箱的的整体设计。首先提出了温控电池箱的总体设计方案，并进行了电池箱的功能描述，其次对电池箱的壳体和上下夹具做了详细的设计和空间上的布置，再次对散热设备和加热设备进行了比较和选型。最后对散热设备、加热设备和温度传感器的布置进行了详细的分析。更多还原

【Abstract】 China has been working on research and development (R&D) of electric vehicle’s related technology for years, and the electric vehicle industry in China has achieved rapid development, which is supported by National863Program of R&D. Not only a series of key technologies have been overcome, but also small quantities of electric vehicle products, researched and developed independently, have come into the market. In some areas of technology, Simultaneous development with Japan, the United States and Europe has been achieved. Power battery for electric vehicles, especially pure electric car, there is no perfect, comprehensive detection system and management system in the links of production and use. Battery management system (BMS) which can be bought on the current market have the data acquisition module, the data display module, high pressure and low voltage protection modules and the battery state of charge (SOC) estimating and display module, etc. Battery thermal management module has not been added to the battery management system, therefore, it is necessary to study the battery pack thermal management system, in order to narrow down the temperature difference among every the battery cell of the battery pack, so the temperature distribution is more even, thus can enhance electrochemical characteristics of the battery pack, improve the charging and discharging ability and life of the battery, and make BMS more perfect at the same time.This thesis is supported by Science and Technology Department of Jilin Province’s scientific and technological development projects,"Pure Electric Grade Commercial Bus development", and pure electric vehicles using Lithium iron phosphate power battery is its research subject. In this thesis, the method of combining experiment and simulation will be applied to study the temperature field of heat generation and heat dissipation of the battery pack, which will provide technical support to the overall design of the thermostat battery box.The main contents of this thesis can be summarized as follows:1. Analysis of the thermal characteristics of the lithium-ion battery. First of all, the thesis will make you understand the working principle, structure and electrochemical properties of lithium-ion battery to analyze the mechanism of lithium-ion battery heat. And then the thesis will analyze the temperature characteristics of the lithium-ion battery to find a correspondence between the battery temperature rising and ambient temperature, while the optimal temperature range of the discharge efficiency of the battery pack will be determined.2. Analysis of Lithium-ion battery packs heat temperature field simulation. Through establishing the thermal effect model of the lithium-ion battery and the model of the rate of heat generation, and then calculating thermal conductivity, specific heat capacity and density parameters of battery thermal model, the initial and boundary conditions of a thermal model will be finally ascertained. That realized the temperature field simulation of heat generation, and obtained temperature distribution after the battery heat.3. Analysis of Lithium-ion battery pack heat dissipation temperature field simulation. First of all, the advantages and disadvantages of the various heat transfer medium will be introduced, the air-cooled cooling mode will be determined, and simultaneously parallel ventilation heat dissipation structure will be used. Then, the air flow will be analyzed in order to establish the battery-air fluid-solid coupled models. Finally, by setting the solver methods and boundary conditions of the battery pack thermal model, heat dissipation temperature field simulation will be accomplished, and a good theoretical analysis of the preliminary design for temperature control battery box will be done.4. The overall design of the thermostat battery box. First, the overall design scheme of the thermostat battery box will be proposed, and a description of the function of the battery box will be done. Then, a detailed design and space layout on the shell of the battery box and the upper and lower fixture will be done. Next, a comparison and selection of heat dissipation equipment and heating equipment will be done. Finally, a detailed analysis of the layout of heat dissipation equipment, heating equipment and temperature sensors will be done.更多还原