摘要
针对低温环境下,由于锂离子电池内阻增加所带来的充电能力下降问题,依据锂离子电池极化内阻产热分析,提出采用变频脉冲激励的方法实现电池的低温预热。建立锂离子电池等效电路和内阻产热相结合的热电耦合模型,在此基础上推导了脉冲激励预热过程中,锂离子电池温升的计算方法。根据不同温度下锂离子电池的电化学阻抗谱(EIS)测试结果,以当前温度下锂离子电池的最大预热功率作为目标,实时计算不同温度下的最佳脉冲频率。实验结果表明,应用所提脉冲频率优化的预热策略,锂离子电池从-20℃预热至5℃用时368 s。25次预热循环结束后,锂离子电池容量衰减仅为0.16%。电化学阻抗谱分析结果证明,所提方法在预热过程没有促进电池内部副反应的进程。
Aiming at the problem of the decrease of the charging ability caused by the increase of the internal resistance of the lithium-ion battery at low temperature,a method of variable frequency pulse excitation was proposed.A thermoelectric coupling model combining the equivalent circuit and the internal resistance heat generation was established,and on this basis,the calculation method of the temperature rise during the pulse excitation preheating process was established.According to the test results of electrochemical impedance spectroscopy(EIS)at different temperatures,the maximum preheating power at the current temperature was taken as the target to calculate the best pulse frequency at different temperatures.Experiments show that using the proposed preheating strategy optimized for pulse frequency,it takes 368 s to warm up from-20℃to 5℃.After 25 warm-up cycles,the capacity decay is 0.16%.EIS analysis proves that the method does not promote internal side reactions during the preheating process.
作者
吴晓刚
李凌任
高鑫家
杜玖玉
SHCHUROV N I
WU Xiao-gang;LI Ling-ren;GAO Xin-jia;DU Jiu-yu;SHCHUROV N I(Automotive Electronic Drive Control and System Integration Engineering Research Center of Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;State Key Laboratory of Automobile Safety and Energy,Tsinghua University,Beijing 100084,China;Department of Electrical Engineering Complexes,Novosibirsk Technical University,Novosibirsk 630073,Russia)
出处
《电机与控制学报》
EI
CSCD
北大核心
2021年第11期56-65,共10页
Electric Machines and Control
基金
国家自然科学基金(51877057,51877121,52011530033)
俄罗斯自然科学基金(20-58-53055)。
关键词
锂离子电池
低温
脉冲预热
频率优化
控制
阻抗谱
lithium-ion battery
low temperature
pulse preheating
frequency optimization
control
electrochemical impedance spectroscopy
