摘要
为使锂电池高效可靠运行,对锂电池单体和模组在不同倍率放电下的热特性进行研究。基于一维产热模型和三维传热模型,建立了锂电池电化学-热耦合模型。将仿真与实验测量的电压和平均温度进行对比,验证了模型的有效性,并从产热角度分析了电池温度的变化规律。此外,从连接铝排和正负极柱是否产热,探究了它们对电池模组温度场分布的影响。结果表明:放电倍率越大,电池表面温升越快。在低倍率放电下,可逆热是影响电池表面温度变化的主要因素。铝排和正负极柱产热对电池模组峰值温度和位置有较大影响,但对其最低温度以及位置几乎没有影响。当放电倍率为2 C时,峰值温差达到6.5℃。
For efficient and reliable operation of lithium batteries,this paper investigates the thermal characteristics of lithium battery cells and modules under different multiplier discharges.Based on a one-dimensional heat generation model and a three-dimensional heat transfer model,an electrochemical-thermal coupling model for lithium batteries is established.The simulation is compared with the experimentally measured voltage and average temperature to verify the validity of the model.Meanwhile,the change rule of the battery temperature is analyzed from the perspective of heat generation.In addition,the influence of the connecting aluminum bars and both the positive and negative poles on the temperature field distribution of the battery module is explored from whether the bars and the poles generate heat.The results show that the larger the discharge multiplier,the faster the temperature rise of the battery surface.At a small discharge rate,reversible heat is the main factor affecting the change of the battery surface temperature.The heat generation of the bars and the poles has a large effect on the peak temperature and the location of the battery module,but almost no effect on its minimum temperature as well as the location.When the discharge multiplier is 2 C,the peak temperature difference reaches 6.5℃.
作者
陈万宇
毛征宇
常利军
张焱
任桐
蔡志华
CHEN Wanyu;MAO Zhengyu;CHANG Lijun;ZHANG Yan;REN Tong;CAI Zhihua(Hunan Key Laboratory of Mechanical Equipment for Health Maintenance,Hunan University of Science and Technology,Xiangtan 411201,China;School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《重庆理工大学学报（自然科学）》
北大核心
2023年第7期184-191,共8页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金项目(11972158)
军委科技委基础加强计划技术领域基金项目(2019-JCJQ-JJ-150,2020-JCJQ-JJ-356)
湖南省研究生科研创新项目(CX20221044)。
关键词
方型锂电池
电化学-热耦合模型
热特性
温度场
square lithium battery
electrochemical-thermal coupling model
thermal characteristics
temperature field
