摘要
锂离子电池在不同容量区间和不同工况应力下使用衰退性能不同。该文以复合材料锂离子电池为研究对象,基于电化学相变机理对循环区间进行划分,在分区间和全区间分别完成了累计吞吐量600次的循环测试。基于不同容量区间循环过程性能衰退结果,采用回归分析法建立锂离子电池的特征参量相关性模型,包含累积容量衰退率的相关性、累积内阻衰退率的相关性和二者之间的相关性,得到模型的拟合优度均在95%以上。进一步地,将模型推广到更宽的温度范围,量化分析了模型的适用性。结果表明:在不同温度下,累积容量衰退率的相关模型适用性很强,但累积内阻相关模型和两参量之间相关模型的适用性较弱。不同衰退路径下容量和内阻的演变规律,为锂离子电池的使用区间选择提供了依据,也为不同条件下的衰退预测提供了新思路。
The performance of li-ion battery is different under different capacity ranges and stress conditions.In this paper,lithium ion battery of composite material was taken as the research object,and the cycle range was divided based on the electrochemical phase change mechanism.A total throughput of 600 cycle tests was performed in the divided ranges and the whole range.Based on the performance degradation results in the cycle of different capacity ranges,the regression parameter analysis method was used to establish the characteristic parameter correlation model of lithium ion battery,including the correlation of cumulative capacity degradation rate,the correlation of cumulative internal resistance degradation rate and the correlation between them.The fitting goodness of the models are above 95%.Furthermore,the models were extended to a wider temperature range,and the applicability of the models was quantitatively analyzed.The results show that the correlation model of cumulative capacity degradation rate is very applicable at different temperatures.However,the applicability of the cumulative internal resistance correlation model and the correlation model between the two parameters are weak.The evolution law of internal resistance and capacity under different degradation paths provides a basis for the selection of the cycle range of li-ion batteries,and also provides a new idea for degradation prediction under different conditions.
作者
孙丙香
刘佳
韩智强
任鹏博
张维戈
Sun Bingxiang;Liu Jia;Han Zhiqiang;Ren Pengbo;Zhang Weige(National Active Distribution Network Technology Research Center Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Jiaotong University,Beijing 100044 China;Beijing Electric Vehicle Co.Ltd,Beijing 100176 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第9期2063-2073,共11页
Transactions of China Electrotechnical Society
基金
国家重点研发计划(2018YFB0104400)
国家自然科学基金重点基金(61633015)资助项目。
关键词
锂离子电池
循环区间
衰退路径
相关性
温度适用性
Lithium-ion battery
cycle range
degradation path
correlation
thermal applicability
