磷酸铁锂和三元锂电池热功率参数的变化特性  

Variation characteristics of thermal power parameters of lithium iron phosphate and ternary lithium batteries

作　　者：庄玲[1] 姜贵文 胡清华[1] 何星 ZHUANG Ling;JIANG Guiwen;HU Qinghua;HE Xing(School of Physics and Electronic information,Shangrao Normal College,Shangrao,Jiangxi 334001,China;Research Center of Intelligent Engineering Technology of Electronic Vehicle Parts of Jiangxi Province,Shangrao 334001,China)

机构地区：[1]上饶师范学院物理与电子信息学院,江西上饶330041 [2]江西省电动汽车部件智能化工程研究中心,江西上饶330041

出　　处：《南昌大学学报（理科版）》2023年第3期229-233,共5页Journal of Nanchang University(Natural Science)

基　　金：江西省教育厅科技项目(GJJ211701);上饶师范学院校级课题资助项目(202133)。

摘　　要：基于HPPC脉冲放电,测试了磷酸铁锂和三元锂电池的欧姆内阻、极化内阻和熵热系数等热功率参数,分析了这两种电池热功率参数随工作温度和放电深度(DOD)的变化规律;同时采用恒流放电模式比较了这两种电池不同温度下的容量。结果表明:随环境温度的降低,两种电池的欧姆内阻和极化内阻增大,放电容量减小;随DOD增加,欧姆内阻基本保持不变,极化内阻呈“U”字形变化;DOD<90%,熵热系数略大于零,DOD=90%~100%,熵热系数为负值,其绝对值急剧增大;同种状态下,磷酸铁锂的欧姆内阻、极化内阻和熵热系数大于三元锂电池。In this work,the thermal power parameters of lithium iron phosphate and ternary lithium batteries,such as ohmic internal resistance,polarized internal resistance and entropy thermal coefficient,were measured based on HPPC pulse discharging method.The dependence of thermal power parameters of the two batteries on operating temperature and depth of discharge(DOD)were discussed,respectively,while the discharging capacity of the two batteries were compared by constant discharging mode at different temperatures.The results showed that:(1)with the decrease of environment temperature,the ohmic internal resistance and polarized internal resistance increased,and the discharging capacity decreased.(2)Ohmic internal resistance almost kept constant with DOD increasing,however,the polarized internal resistance changed in the shape of"U".(3)At the value of DOD less than 90%,Entropy thermal coefficient was small,slightly greater than zero,however,DOD up to 90%-100%,Entropy thermal coefficient was changed to negative value and its absolute value increased dramatically.In the same state,the ohmic internal resistance,polarized resistance and entropy thermal coefficient of lithium iron phosphate were greater than those of ternary lithium battery.

关 键 词：锂电池 放电容量 欧姆内阻 极化内阻 熵热系数 

分 类 号：TM911[电气工程—电力电子与电力传动]