摘要
为探索纯电动汽车用锂离子电池在放电过程中的瞬态热特性,通过试验测试得到不同温度下的内阻和不同放电倍率下的温升曲线,计算出不同放电倍率下的瞬时生热率;根据0.5C放电倍率下的瞬时生热率和内阻生热率,求出熵热(可逆反应热)系数变化曲线,分析锂离子电池熵热特性对瞬态生热特性的影响。分析结果表明:锂离子电池的瞬态热特性主要受电池内阻热和熵热(可逆反应热)的瞬态特性影响;熵热是影响电池放电过程中温度波动的主要因素,在放电中期会出现由相变反应引起的吸热现象;在小倍率放电过程中,熵热对电池温度场的影响大于内阻热,而在大倍率中则相反。通过分析,可以为电池瞬态生热模型的建立与完善提供依据。
To explore the transient thermal characteristics of lithium-ion batteries used in pure electric vehicles during discharge, the internal resistance at different temperatures and the temperature rise curves at different discharge rates were obtained through tests, and the transient heat generation rates were calculated at different discharge rates. According to the transient heat generation rate and the heat generation rate of internal resistance under the discharge rate of 0.5 C, the curve of entropy heat(i.e., heat generated in the reversible reaction) coefficient was calculated, and the effect of entropy heat characteristics of the lithium-ion battery on the transient heat generation characteristics was analyzed. Results show that the transient thermal characteristics of the lithium-ion battery were mainly influenced by the transient characteristics of internal resistance and entropy heat;entropy heat was the main factor influencing the temperature fluctuation during discharge, and the heat absorption phenomenon caused by the phase change reaction would appear in the middle of the discharge process. At a small discharge rate, entropy heat had more influences on the temperature field of the battery than the internal resistance heat;however, at a large discharge rate, the relation was reversed. The analyses in this paper can provide reference for the establishment and improvement of the transient heat generation model of batteries.
作者
姜水生
马龙
姜光军
文华
江先念
JIANG Shuisheng;MA Long;JIANG Guangjun;WEN Hua;JIANG Xiannian(School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China;Jiangling Group New Energy Automobile Co., Ltd,Nanchang 330013, China)
出处
《电源学报》
CSCD
北大核心
2019年第2期171-177,共7页
Journal of Power Supply
基金
南昌大学研究生创新专项资金资助项目(cx2016088)~~
关键词
锂离子电池
熵热系数
放电过程
瞬态热特性
生热率
ithium-ion battery
entropy heat coefficient
discharge process
transient thermal characteristic
heat generation rate
