用于储能电站热失控预警的热敏涂层材料研究

Research on Thermosensitive Coatings for Thermal Runaway Warning in Energy Storage Power Station

[目的]磷酸铁锂电池储能电站是新型电力系统消纳大规模新能源的重要基础,然而电池单元的热失控严重威胁储能电站的运行安全。对储能电站局部过热进行实时监测和科学预警具有重要意义。[方法]在此工作中,制备了一种具有感知过热温度并产生颜色变化的热敏微胶囊,将其适量添加到环氧树脂基体中构成具有感知外部过热温度场特性的复合绝缘材料。[结果]测试结果表明,所制备的热敏微胶囊/环氧树脂绝缘示温涂层的颜色可以灵敏地随外界温度变化而发生变化,在60℃左右时发生颜色突变。当热敏微胶囊的掺杂质量分数为0.25%时,复合涂层的绝缘强度、介电特性和纯环氧树脂材料相当,保持良好的本征电气性能。[结论]研究提出的热敏变色复合绝缘涂层可对外界局部过热状态的温度可视变化,为储能电站的热失控预警应用提供了一条新的技术路线,具有一定的工程应用价值。

[Introduction]Lithium iron phosphate battery storage power plants are an important basis for new power systems to consume large-scale new energy,however,the thermal runaway of battery cells seriously threatens the operational safety of storage power plants.It is important to conduct real-time monitoring and scientific warning of local overheating in storage power plants.[Method]In this work,a thermal microcapsule with the ability to sense overheating temperature and produce colour changes was prepared and added in appropriate amounts to an epoxy resin matrix to form a composite insulating material with the characteristics of sensing external overheating temperature fields.[Result]Test results show that the colour of the prepared thermosensitive microcapsule/epoxy insulating temperature indication coating can change sensitively with external temperature changes,with a sudden colour change occurring at around 60°C.When the doping mass fraction of the thermosensitive microcapsules is 0.25%,the insulation strength and dielectric properties of the composite coating are comparable to those of the pure epoxy resin material,maintaining good intrinsic electrical properties.[Conclusion]The thermosensitive colour-changing composite insulation coating proposed in the study can visibly change the temperature of the external local overheating state,providing a new technical route for the application of thermal runaway warning in energy storage power plants,which has certain engineering application value.