基于大平板热管的电池热管理实验及仿真  

Experimental and simulation on battery thermal management based on a large flat heat pipe

作　　者：刘彬[1,2] 胡子强 李夔宁[1,2] 谢翌[3] 郑锦涛 LIU Bin;HU Ziqiang;LI Kuining;XIE Yi;ZHENG Jintao(Key Laboratory of Low-grade Energy Utilization Technology and System of Ministry of Education,Chongqing University;School of Energy and Power Engineering,Chongqing University;College of College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室 [2]重庆大学能源与动力工程学院 [3]重庆大学机械与运载工程学院,重庆400044

出　　处：《储能科学与技术》2021年第4期1364-1373,共10页Energy Storage Science and Technology

基　　金：高性能纯电动运动型多功能汽车(SUV)开发(2018YFB0106100);新能源汽车高效整车一体化热管理系统的研究(KJQN201800121);中央高校项目(2020CDJGFCG009)。

摘　　要：热特性是影响锂离子电池性能的主要因素之一,当电池以较高倍率进行充放电时,热量聚集使温度迅速上升,影响电池性能,甚至会产生燃烧或爆炸。本工作搭建了一种基于大平板热管的高效高均温性电池散热模型。电池组置于大平板热管上,底部辅以风冷散热,在不同工况下对电池表面平均温度及最大温差进行数值计算,并通过实验验证了热管理模型准确性。结果表明,当环境温度为20℃、冷却风速为5 m/s、以1 C放电至截止电压时,电池组平均温度为38℃,最大温差为1.9℃;在大平板热管散热端适量布置翅片可增大换热面积,提高换热效率。Thermal characteristics are a major factor affecting the performance of lithium-ion batteries.When a battery is charged and discharged at a high rate,heat accumulation causes the temperature to rise rapidly,affecting the battery performance and even causing the danger of combustion or explosion.In this study,the heat generation mechanism of lithium-ion batteries is studied by combining theory with experiment.The HPPC pulse current method is used to identify the internal ohmic resistance and internal polarization resistance of the battery offline,and the heat transfer coefficient of the flat heat pipe is identified by the least square method.Under various working conditions,the average temperature and the maximum temperature difference at the battery surface were calculated,and the accuracy of the thermal management model was experimentally verified.At an ambient temperature of 20℃,a cooling wind speed of 5 m/s,and the discharge of the battery pack at the cut-off voltage of 1 C,the average temperature of the battery pack is 38℃,and the maximum temperature difference is 1.9℃.When the heat exchange area increases,the heat exchange efficiency improves.This research promotes the application of flat heat pipes in the heat dissipation of power batteries and provides a basis for ensuring the safety and efficiency of batteries under high-rate charging and discharging.

关 键 词：脉冲电流法 大平板热管 均温性 风冷散热 

分 类 号：TM911[电气工程—电力电子与电力传动]