CAJ | 학술논문

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。
건립고산리전지고상열람용적열모형，병대불동고상온도하적열람용진행수치모의。비교분석전심불동구역적열람용반응급열행위발현，고온하전지전심발생열실공적주요열량래자우정전겁여전해액적반응，격리막구역적열생성량최소。고찰불동산열조건화고상온도대전심열행위적영향발현，산열조건화배경온도시영향전심열행위적관건인소，발생열실공적림계온도수착산열조건적변호이승고，사득전지불발생열실공적림계산열계수수착고상온도적승고이증대。
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.