动力锂电池在NEDC工况下的热特性研究  

Study on Temperature Characteristics of High-Power Li-Ion Cells under NEDC

作　　者：李圆圆[1] 霍炜[1] 李志明[1] 樊华敏 黄福闯 LI Yuanyuan;HUO Wei;LI Zhiming;FAN Huamin;HUANG Fuchuang(School of Electromechanic Engineering,Qingdao University,Qingdao 266071,China)

机构地区：[1]青岛大学机电工程学院,山东青岛266071

出　　处：《青岛大学学报（工程技术版）》2018年第3期110-114,共5页Journal of Qingdao University(Engineering & Technology Edition)

基　　金：青岛市战略性新兴产业培育计划(14-8-1-2-gx)

摘　　要：本文以某18650锂电池为研究对象,探索动力锂电池在NEDC工况下的热特性。根据锂电池OCV曲线和内阻的焦耳特性,建立基于NEDC工况的动力电池发热特性数学模型,并根据牛顿冷却公式和斯蒂芬-玻尔兹曼定律建立电池NEDC工况过程中的散热数学模型,后使用Matlab进行电池热特性仿真。探究基于NEDC工况的动力电池热特性实验方法,并搭建实验电路硬件平台,基于PWM波占空比变化控制电池,使其按照NEDC工况输出功率。使用示波器采集实验数据,并连接PC,将实验数据导入硬盘处理。实验结果表明,本文使用PWM波等效NEDC输出功率的方法可完成锂电池大倍率放电过程中的测量工作;在第2个循环后期,动力电池电量即将耗尽时,内阻急剧上升,考虑到安全问题此时不应继续使用电池。In this paper, 18650 Li ionbatteries are researched, to explore the thermal characteristics of the high power Li ionbattery under the NEDC. According to OCV curve of Li ion battery and theJoule＇s law of internal resistant, the mathematical model of heating characteristics of high power Li ionbattery based on NEDC is es tablished. Based on Newton＇s cooling formula and Stephen Boltzmann＇s law, a mathematical model of heat dissi pation during battery NEDC operation is established. Then thermal simulation of the battery is performed with Matlab. The experimental method of thermal characteristics of high power Li ionbattery based on NEDC is ex plored, and the circuit platform of the experimentis built. The output power of the high power Li ioncell is controlled by the duty cycle of PWM wave based on NEDC. During Experimental process, the experimental da ta import into the hard disk of a PC that connected with an oscilloscope, the device measures experimental vari ables. The results show that the PWM wave method which is equivalent to NEDC output power couldfulfil the mission of measurement during lithium battery discharge in a high power and the end of the second cycle, the high power Li ioncell is about to exhaust, and its internal resistance rose sharply. Taking into account the safe ty problem at this time thehigh power Li ioncell should no longer be used.

关 键 词：NEDC 温度 MATLAB 锂电池 单片机 

分 类 号：TM912.9[电气工程—电力电子与电力传动]