The application provides a preparation method of a
power battery buffer heat insulation pad, and relates to the technical field of
power battery thermal management.The method comprises the following steps: preparing a gradient core material layer, and cooperatively curing the gradient core material, to prepare a
power battery buffer heat insulation pad comprising a
contact layer, a
transition layer and a core layer; introducing Bi2Te3
topological insulator nanosheets into the core layer, and applying an axial
magnetic field during the preparation process to make the Bi2Te3
topological insulator nanosheets directional arrangement, so as to form an ultralow
thermal conductivity layer, effectively reduce the
thermal conductivity, and significantly improve the heat insulation performance; a multifunctional structure with elastic buffering, stress dispersion and ultralow
thermal conductivity characteristics is formed; the elastic buffering characteristics of the
contact layer and the stress dispersion characteristics of the
transition layer effectively improve the overall
mechanical strength and durability; the gradient density core material is adopted, and the
sound field assisted preparation technology is combined, so that the
bottleneck of the traditional process is broken, and the method has significant advantages in thermal management, mechanical performance and safety performance.