Heat generation measurement and thermal management with phase change material based on heat flux for high specific energy power battery

作     者：Wang, Haimin Wang, Yufei Hu, Feng Shi, Weijie Hu, Xuebin Li, Huanqi Chen, Si Lin, Hao Jiang, Chenglong 

作者机构：Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Dongfeng Commercial Vehicle Co Ltd Dongfeng Commercial Vehicle Tech Ctr Wuhan 430056 Peoples R China China Automot Technol & Res Ctr Co Ltd Tianjin 300300 Peoples R China 

出 版 物：《APPLIED THERMAL ENGINEERING》 (实用热力工程)

年 卷 期：2021年第194卷

页      面：117053-117053页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Key R&D Program of China [2018YFB0104400] National Natural Science Foundation of China 

主　　题：Power battery Heat generation rate Heat flux Energy distribution PCM thermal management 

摘      要：LiNi0.8Co0.1Mn0.1O2 (NCM811) lithium-ion battery is a kind of high specific energy power battery. By directly measuring the heat flux on the surface of a 21700-type cylindrical battery and the temperature of its inner center, the heat generation rate, the heat energy dissipated and the electric energy released at different discharge rates are all obtained. The results turn out that increasing the discharge rate will reduce the electric energy and correspondingly increase the heat energy released, while the total amount of both remains unchanged. When the discharge rate increases from 1C to 2.5C, the ratio of discharge heat generation to discharged energy increases from 2.89% to 7.89%. According to the heat generation rate obtained from the experimental results, a single cylindrical cell structure and hexagonal cell module were designed for different discharge rates with high thermal conductivity graphene paraffin composite phase change material (PCM). PCM structure can well manage the thermal parameters, which helps to maintain the stability and consistency of battery temperature. The distance between two adjacent batteries has a greater impact on the temperature distribution of the battery module during high rate discharge, and monitoring the change of heat flux can predict the failure of the thermal management of the battery in advance. It is a beneficial attempt to adopt PCM to manage the temperature field of the battery pack and use heat flux to monitor the solid state of PCM, which is also very helpful for the safe operation of the battery system.