文献类型：期刊文献

英文题名：Effects of discharge rate on electrochemical and thermal characteristics of LiFePO4/graphite battery

作者：Huang, Yingxia[1];Lai, Huanxin[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：157

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20192006912998);WOS:【SCI-EXPANDED(收录号:WOS:000475994000043)】；

语种：英文

外文关键词：Electrochemical-thermal coupled model; Discharge rate; Electrochemical and thermal characteristics

摘要：The discharge rate has great influences on the electrochemical reaction rate and heat generation in lithium ion batteries. In order to simulate the discharge process and investigate the effects of discharge rate on electrochemical and thermal characteristic, a one-dimensional electrochemical-thermal coupled model has been developed for a prismatic LiFePO4 battery cell unit. The model is validated by experimental data for electrochemical and thermal performance. The electrochemical and thermal behaviors of the battery cell at different discharge rate are investigated in detail. The results show that the spatial and temporal distributions of the electrochemical reaction rate and the generated heat are non-uniform. The non-uniformity becomes aggravated at higher discharge rates. The averaged reaction heats in both positive and negative electrodes are mainly determined by the entropy change, while the averaged heat from polarization and ohmic heat across the cell unit have regular changes with time. Furthermore, the polarization heat is the main part of the total heat generation in a lithium-ion battery cell unit. With the increases of discharge rate, the polarization heat remains the main part of heat production, but its proportion decreases slightly, while the proportion of the ohmic heat increases.