基于柔性相变材料的电加热棒温控实验研究

Experimental study on the temperature control effect of electric heating rod based on flexible phase change materials

为了研究柔性相变材料对电池控温效果的影响,解决传统相变材料硬度大、易脆、安装不便的问题。以石蜡(PA)为相变基体,烯烃嵌段共聚物(OBC)为支撑材料,氮化硼(BN)为添加剂,熔融制备了一种PA-OBC/BN柔性相变材料,以电加热棒模拟电池发热,研究功率、间歇工作、添加剂、材料尺寸对加热棒控温效果的影响。结果表明:使用相变材料控温能够有效地降低电加热棒的表面温度,高加热功率下效果更明显;BN的加入,不仅可以增强控温效果,还可以显著地提高加热棒表面温度的均匀性,在实验范围内,表面最大温度差不超过0.3℃;通过压应力试验发现与以高密度聚乙烯(HDPE)为支撑基的相变材料相比,本柔性材料的硬度更低,韧性更高,延展性更好。上述研究可为柔性相变材料的温控及实际安装应用提供参考。

In order to study the influence of flexible phase change material(FPCM)on the temperature control effect of batteries and solve the problems of traditional phase change materials,such as the hardness,brittleness,and inconvenient installation,a flexible phase change material PA-OBC/BN was prepared by melting method using paraffin(PA)as phase change matrix,olefin block copolymer(OBC)as support material,and boron nitride(BN)as additive.An electric heating rod was used to simulate battery heating,and the effects of power,intermittent work,additives,and material size on the temperature control effect of the heating rod were investigated.The results showed that using PCM could effectively reduce the surface temperature of electric heating rod,and the effect was more obvious at high heating power.The addition of BN could not only enhance the temperature control effect,but also significantly improve the surface temperature uniformity of the heating rod.In the experimental range,the maximum surface temperature difference was no more than 0.3℃.The compressive stress test revealed that,compared with the phase change material supported by high density polyethylene(HDPE),the FPCM had lower hardness,higher toughness and better ductility.The above research results could provide reference for the temperature control and practical installation of flexible phase change materials.