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CN-122008590-A - Insulation integrated composite material and application thereof in exoskeleton power module heat dissipation structure

CN122008590ACN 122008590 ACN122008590 ACN 122008590ACN-122008590-A

Abstract

The invention relates to the technical field of insulating heat-conducting composite materials, in particular to an insulating integrated composite material and application thereof in an exoskeleton power module heat dissipation structure. The filler is obtained by constructing an inorganic oxide shell layer on the surface of hexagonal boron nitride and loading a small amount of magnetic particles, and an integral cross-linking structure of an out-of-plane high heat conduction layer and an in-plane high heat conduction and heat diffusion layer is prepared through layered magnetic field orientation, so that the heat conduction coefficient and heat conduction anisotropy of the out-of-plane and in-plane are remarkably improved, simultaneously, a lower dielectric constant, high volume resistivity and high breakdown strength are maintained, and the filler can be used for an insulating heat conduction sleeve of an exoskeleton motor stator and a battery compartment shell lining plate, and high-efficiency and safe heat dissipation management of a power module under compact space and extreme working conditions is realized.

Inventors

  • LIU SHUIYAN
  • ZHANG JINZHU
  • Qu Muchao

Assignees

  • 广州海天塑胶有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. The preparation method of the insulation integrated composite material is characterized by comprising the following steps of: s1, dispersing a hexagonal boron nitride sheet layer in an ethanol aqueous solution, adding an inorganic oxide precursor, reacting, and generating an inorganic oxide shell layer on the surface of the hexagonal boron nitride sheet layer in situ to obtain inorganic oxide coated boron nitride; S2, mixing and dispersing an organic insulating matrix and a flame-retardant filler to obtain an insulating flame-retardant matrix premix, adding the magnetic response insulating boron nitride lamellar filler obtained in the step S1 into the insulating flame-retardant matrix premix, dispersing and defoaming through high-speed shearing or planetary stirring, and then adding a crosslinking curing component to uniformly mix to obtain a premix for molding; And S3, pouring part of premix into a mold to form a first layer, aligning the magnetic response insulating boron nitride sheet filler along the thickness direction under the action of a magnetic field perpendicular to the plane of the material, pre-curing the first layer under the condition of maintaining the magnetic field to form an out-of-plane heat conduction framework, continuously pouring the premix on the surface of the first layer to form a second layer, aligning the magnetic response insulating boron nitride sheet filler basically parallel to the surface of the material under the action of the magnetic field and the rotation of a sample around a vertical axis, and curing the whole under the condition of maintaining an alignment structure to ensure that the first layer and the second layer are crosslinked into a whole, thereby obtaining the integrated insulating composite material with the out-of-plane heat conduction layer and the in-plane heat conduction layer.
  2. 2. The method for preparing an insulation integrated composite according to claim 1, wherein the inorganic oxide shell layer is any one of SiO 2 、Al 2 O 3 and TiO 2 .
  3. 3. The method of producing an insulation integrated composite according to claim 1, wherein the magnetic inorganic particles are ferrite magnetic particles.
  4. 4. The method for preparing an insulation integrated composite according to claim 3, wherein the ferrite magnetic particles are ferroferric oxide nanoparticles.
  5. 5. The method for producing an insulation integrated composite according to claim 1, wherein the mass of the magnetic inorganic particles is 0.1% to 0.8% of the mass of the inorganic oxide-coated boron nitride.
  6. 6. The method for preparing an insulation integrated composite material according to claim 1, wherein the organic insulation matrix is any one of silicone rubber, epoxy resin or polyurethane.
  7. 7. The method for preparing an insulation integrated composite material according to claim 6, wherein the organic insulation matrix is an addition-crosslinking silicone rubber.
  8. 8. The method of preparing an insulation integrated composite according to claim 1, wherein the flame retardant filler comprises aluminum hydroxide and/or magnesium hydroxide.
  9. 9. An insulation integrated composite, characterized in that it is prepared by the method of any one of claims 1-8.
  10. 10. Use of the insulation integrated composite of claim 9 in an exoskeleton power module heat dissipation structure.

Description

Insulation integrated composite material and application thereof in exoskeleton power module heat dissipation structure Technical Field The invention relates to the technical field of insulating heat-conducting composite materials, in particular to an insulating integrated composite material and application thereof in an exoskeleton power module heat dissipation structure. Background The exoskeleton system, as an on-body worn electromechanical device, typically includes a high power density motor and a high energy density battery pack as its power module. Under the conditions of compact packaging and limited heat dissipation space, the motor winding and the battery core can generate large heat flux density under the working conditions of high load and transient impact, and if heat dissipation is unsmooth, local overheating is easily caused, insulation aging, performance attenuation and even safety accidents are caused. Especially in the exoskeleton application scene, the power module is arranged close to a human body, so that the electric safety of the human body is ensured, the heat flux density pointing to the direction of the human body is restrained, and higher requirements are provided for the comprehensive performance of the high heat conduction, high insulation and controllable heat flux path of the material. The conventional practice is to fill inorganic fillers such as alumina, hexagonal boron nitride and the like in polymer matrixes such as silicon rubber, epoxy resin and the like, and improve the heat conduction performance by improving the volume fraction of the fillers or adopting the orientation of flaky fillers. Although the heat conductivity can be improved to a certain extent, the scheme has the outstanding problems that firstly, higher filler content is needed to obtain higher heat conductivity coefficient, the viscosity of a system is increased, the processing and forming are difficult, the dielectric constant and dielectric loss are obviously increased, the volume resistivity and the breakdown strength are reduced, the long-term insulation reliability under the conditions of high voltage and high field strength are difficult to meet, secondly, most materials are isotropic or only have weak anisotropy in a single direction, the cooperative design of the rapid heat conduction in the thickness direction and the heat diffusion in the in-plane direction is difficult to realize, the efficient heat dissipation and the thermal comfort are not considered in the application of exoskeleton close to a human body, thirdly, the common multi-layer structure is usually formed by laminating or bonding different materials, the interface thermal resistance is large, and layering and interface failure are easy to occur under long-term service. CN121471589a discloses a three-dimensional boron nitride skeleton, a high-thermal-conductivity insulating composite material and a preparation method thereof. The technology comprises the steps of hydroxylating boron nitride, modifying the surface of a silane coupling agent, mixing with saccharides, pressing and forming, then dissolving the saccharides to obtain a three-dimensional porous boron nitride skeleton, filling matrixes such as epoxy resin, phenolic resin, polylactic acid or paraffin phase change material and the like into the pores of the skeleton in a vacuum impregnation mode, curing and forming, so that a continuous three-dimensional heat conduction network is constructed under the condition of low boron nitride content, the heat conductivity and the volume resistivity of the composite material are remarkably improved, and the technology has good application prospect in the field of high-voltage electrical insulation. The material has a certain advantage in improving heat conduction and insulation performance, but has obvious defects from the practical requirement of an exoskeleton power module that a nearly isotropic three-dimensional boron nitride skeleton is adopted, controllable heat conduction anisotropy is difficult to form in the thickness direction and the in-plane direction, a layered functional structure which is close to heat source side strengthening out-of-plane heat conduction and close to human body side strengthening in-plane diffusion and shielding cannot be constructed in the same material, the skeleton is a static porous network, no magnetic component and magnetic field orientation regulation and control are introduced, the direction of a heat conduction channel cannot be dynamically designed in the forming process, meanwhile, the composite material mainly faces a high-voltage insulation device, is not optimized for comprehensive requirements such as flexible forming, complex curved surface fitting, limiting pointing to human body heat flux density and the like under the condition of wearing the exoskeleton in close-fitting, and the design problem of a heat conduction and insulation performance balance window under the condition of intro