基于NTC微珠状热敏电阻的瞬态热测量技术

Transient Thermal Measurement Technology Based on NTC Bead Thermistor

实时原位监测相变材料热物性可以为优化新能源汽车电池热管理提供可靠数据支撑。提出了一种瞬态热测量技术,并建立对应的物理模型和方法,用于同步测量相变材料的导热系数和热扩散系数。采用该方法对相变材料石蜡进行测量分析,并通过仿真和试错法进行误差修正,测量得到石蜡的导热系数为0.245 W/(m·K),热扩散系数为1.07×10^(-7) m^(2)/s。测量值与参考值吻合良好。该方法具有热源小、测量快、原位测量等优点,在新能源汽车相变冷却热管理中有实际应用前景。

Real-time in-situ monitoring of the thermal properties of phase change materials can provide reliable data support for optimizing the thermal management of new energy vehicle batteries.This paper proposes a transient thermal measurement technology,and establishes a corresponding physical model and method to simultaneously measure the thermal conductivity and thermal diffusivity of phase change materials.This method is used to measure and analyze the phase change material paraffin,and the error is corrected through simulation and trial and error method.The measured thermal conductivity of paraffin wax is 0.245 W/(m·K),and the thermal diffusion coefficient is 1.07×10^(-7) m^(2)/s.The measured value is in good agreement with the reference value.The method has the advantages of small heat source,fast measurement,in-situ measurement,etc.,and has practical application prospects in the phase change cooling thermal management of new energy vehicles.