摘要
建立钴酸锂电池烤箱热滥用的热模型,并对不同烤箱温度下的热滥用进行数值模拟。比较分析电芯不同区域的热滥用反应及热行为发现,高温下电池电芯发生热失控的主要热量来自于正电极与电解液的反应,隔离膜区域的热生成量最少。考察不同散热条件和烤箱温度对电芯热行为的影响发现,散热条件和环境温度是影响电芯热行为的关键因素,发生热失控的临界温度随着散热条件的变好而升高,使得电池不发生热失控的临界散热系数随着烤箱温度的升高而增大。
Improper design and abusive operations are identified to be major causes related to safety accidents of lithium-ion batteries. A robust and powerful mathematical-physical model based on relevant complex mechanisms that could be an effective tool for thermal analysis, structural design, and thermal management design of lithium-ion batteries is thus a critically requirement. In this paper a thermal abusing model is established particularly for oven tests of graphite/LiPF6/LiCoO2 batteries to investigate the influence of heat release condition and temperature of oven on battery thermal behaviors by a series of simulations calculation. The simulation results can be applied for detail analysis of battery thermal behaviors. It is found that during abusing processes of oven heat and not leading to thermal runaway, the cathode zone of the battery is the maximum source of heat generation and the rate of heat generation depends mainly on the reaction between intercalated lithium and electrolyte and the decomposition of solid electrolyte interface （SEI）; during abusing processes of oven heat and even leading to thermal runaway, the anode zone is the maximum source of heat generation and the rate of heat generation depends mainly on the reaction between anode and solvent. It is also found that the thermal behavior of the battery is dominated by the combined effect of conditions of heat release and oven temperature, the critical temperature of oven for thermal runaway rises with increase of the heat dissipation coefficient, and the critical dissipation coefficient of heat without thermal runaway increases when the oven temperature rises, indicating the importance of thermal design and management of batteries.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第2期647-657,共11页
CIESC Journal
基金
中国科学院可再生能源重点实验室基金项目(y307j91001)
中国科学院“百人计划”项目(FJ)~~
关键词
锂离子电池
烤箱热滥用
数值模拟
热行为
lithium-ion battery
oven thermal abuse
numerical simulation
thermal behavior
