圆柱锂电池表面自然对流换热系数仿真估算

Simulation and estimation of natural convection heat transfer coefficient on surface of cylindrical lithium ion batteries

为研究锂离子电池热特性机理,针对电池表面自然对流换热系数展开研究,通过实验得到了电池基本生热参数并以此建立了单体锂离子电池生热模型,仿真分析了恒温条件下不同放电电流的表面自然对流换热系数。结果表明:恒温测试环境下,放电电流越大,电池温升速率越快,总内阻增大,实际放电能力呈非线性变化趋势;自定义生热速率下,电池表面自然对流换热系数随着放电深度的增加而提高,放电电流越大对流换热系数上升速率越快。

In order to study the thermal characteristics of lithium-ion batteries,a study was conducted on the natural convective heat transfer coefficients on the surface of the battery.The basic heat-generation parameters of the battery were obtained through experiments,and a single-cell heat-generation model was established.The natural convection heat transfer coefficient of the different discharge current under constant temperature was analyzed.The results show that the larger the discharge current is,the faster the battery temperature rise rate,and the total internal resistance increases,the actual discharge capacity shows a non-linear trend under the constant temperature test environment;the natural convection heat transfer coefficient of the battery surface as the depth of the discharge increases,the larger the discharge current is,the faster the rate of convective heat transfer coefficient rises under a custom heat generation rate.