Packaging structure based on graphene-based phase change composite material and application thereof

Abstract

The invention discloses a packaging structure based on a graphene-based phase-change composite material and application thereof. The packaging structure based on the graphene-based phase-change composite material is composed of the graphene-based phase-change composite material and a packaging shell. Wherein the graphene-based phase change composite material is composed of a large-size ordered porous graphene macroscopic body material and a high-latent-heat phase change material; the packaging shell is composed of a bottom shell and a cover plate. The bottom shell is composed of a graphite aluminum bottom plate and an aluminum surrounding shell. #-shaped ribs and cylinders are arranged on a bottom plate of the bottom shell; the cover plate is composed of an aluminum flat plate and aluminum cross-shaped ribs. The graphene-based phase-change composite material packaging structure can adapt to different work periods, improves the heat flow regulation and control capability, has the comprehensive effects of heat conduction and heat storage, meets the heat management requirement of a high-power electronic device working periodically in a confined space during normal operation, and is suitable for large-scale popularization and application. The problems that large heat in a limited space is accurately dredged, and the temperature of the wall surface is rapidly increased due to the integral accumulation effect of heat flow along with time are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal management of electronic devices, relates to a phase change composite material packaging structure, and also relates to the application of the phase change composite material packaging structure in thermal management of high-power devices working periodically. Background Art

[0002] A large number of high-power devices that work periodically are installed in weapons and equipment. They are usually installed in harsh environments and in limited enclosed spaces. They generate a large amount of waste heat during operation, causing the accumulation of heat in time and space, resulting in local high temperatures, which can cause thermal failure or damage to components (the reliability of components decreases by 50% for every 10°C increase in temperature). The cooling systems currently used for some high-power devices that work periodically are large in size, heavy in weight, and consume a lot of power, which seriously restricts the speed and portability of weapon systems. Therefore, it is urgent to develop a lightweight, small-volume, low-power cooling and heat dissipation system. Summary of the invention

[0003] In view of the shortcomings of the existing cooling systems for high-power devices that work periodically, such as large volume, heavy weight and high power consumption, the purpose of the present invention is to provide a packaging structure based on a graphene-based phase change composite material and its application. The lightweight graphene-based high-enthalpy phase change composite material adopts a high in-plane thermal conductivity, low-density graphene macrostructure and a high-enthalpy phase change material, which can meet the heat dissipation requirements of high-power devices that work periodically while reducing weight, volume and power consumption.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A packaging structure based on a graphene-based phase change composite material, which comprises, from top to bottom, a cover plate, a graphene-based phase change composite material, and a bottom shell;

[0006] The cover plate comprises an upper plate and a cross-shaped rib arranged on one side of the upper plate, and a plurality of circular holes are opened on the upper plate;

[0007] The graphene-based phase change composite material comprises an ordered porous graphene macroscopic material and a phase change material embedded in the ordered porous graphene macroscopic material; a cross-shaped gap matching the cross-shaped rib is provided on one side of the graphene-based phase change composite material that is bonded to the cover plate; a tic-tac-toe-shaped gap is provided on one side of the graphene-based phase change composite material that is bonded to the bottom shell, and a plurality of cylindrical holes are provided on the graphene-based phase change composite material;

[0008] The bottom shell comprises a bottom plate, a surrounding shell arranged around the bottom plate, and tic-tac-toe ribs and columns arranged on the bottom plate and adapted to the tic-tac-toe gaps;

[0009] The positions and sizes of the circular hole, cylindrical hole and cylinder are adapted to each other.

[0010] In order to solve the problem that a large amount of waste heat is generated during the periodic operation of high-power devices, causing the temporal and spatial accumulation of heat to lead to local high temperature, resulting in thermal failure of components, the packaging structure based on the graphene-based phase change composite material designed by the present invention is fixed on the surface of the heat flow area when used for the thermal control of periodic high-power devices. Due to its high in-plane thermal conductivity and latent heat value, it can effectively ensure the thermal safety of the device while reducing the volume and weight of the cooling system. The packaging structure based on the graphene-based phase change composite material designed by the present invention, when the high-power electronic device is working, transmits the heat generated by the high-power device to the graphene-based phase change composite material by heat conduction. Most of the heat is stored in the graphene-based phase change composite material by latent heat. When the high-power device is on standby, the stored heat is released by active cooling, radiation heat dissipation, etc., and this cycle repeats. By using the theoretical analysis and numerical simulation methods of the heat conduction equation, by optimizing the packaging structure design, a lightweight graphene-based high enthalpy phase change composite material packaging structure is finally obtained.

[0011] The graphene-based phase change composite material packaging structure of the present invention is composed of an ordered porous graphene skeleton composite phase change material matrix and a packaging shell. The porous graphene skeleton composite phase change material matrix adopts a phase change material with high latent heat and an ordered porous graphene macrobody with high thermal conductivity, which gives it a high enthalpy value and a high in-plane thermal conductivity. The enthalpy value of the phase change composite material is greater than 220 J / g, and the in-plane thermal conductivity is higher than 35 W / (m K). It can not only provide a large heat storage capacity, but also give the packaging structure good thermal conductivity, so that heat can be quickly transferred in the in-plane direction to avoid the accumulation of heat in high-power electronic devices.

[0012] The bottom shell of the graphene-based phase-change composite packaging structure of the present invention is made of graphite aluminum composite material, which has a larger range and more efficient heat flow conduction capacity than aluminum, and is lighter than aluminum. When in use, it contacts the side of the high-power electronic device that generates waste heat, and quickly transfers the heat flow in the high heat flux density area to the low-temperature area of ​​the phase-change composite material, so that the heat flow is evenly distributed on the entire surface of the high-power electronic device, so that the temperature of the high-power electronic device is maintained within the safe use temperature range. The graphene-based phase-change composite packaging structure of the present invention has the characteristics of light weight and high thermal conductivity. According to theoretical calculations, the overall weight of the packaging structure is less than 1.5g / cm 3; Through simulation research, the thermal conductivity in the plane is greater than 120W / (m K), and the thermal conductivity in the thickness direction is greater than 10W / (m K). In summary, the graphene-based phase change composite packaging structure of the present invention efficiently manages the periodic heat flow on the surface of high-power devices by utilizing the characteristics of each material through packaging combination, and uses graphite aluminum in the bottom shell and ordered porous graphene in the phase change composite material to achieve rapid heat transfer along the plane direction. In the graphene phase change composite material, a phase change material with a high latent heat value is used to increase the heat capacity absorbed, so that the temperature within the working cycle of the high-power device finally meets the safety temperature control requirements.

[0013] Preferably, the material used for the cover plate is relatively low-cost aluminum, and the thickness of the cover plate is 2mm to 2.8mm, ensuring that the overall mass of the graphene-based phase change composite material packaging structure is relatively light. The height of the "cross" ribs is 2mm to 4mm, ensuring that the graphene-based phase change composite material is not penetrated by the ribs in the thickness direction. There are no ribs in the graphene-based phase change composite material in the middle part, so that it is impossible to form a "thermal bridge", and heat will not be directly transferred to the other side through the ribs; the top of the "cross" rib is 5mm to 10mm away from the edge of the cover plate, in order to ensure that the graphene-based phase change composite material is not penetrated by the ribs in the in-plane direction to avoid the formation of a "thermal bridge", and the diameter of the circular hole is 6mm to 10mm.

[0014] Preferably, the materials used for the bottom plate are aluminum and graphite aluminum, wherein the materials used for the ribs, cylinders and surrounding shells are aluminum, and the materials used for the remaining plates are graphite aluminum. The thickness of the portion of the bottom plate made of graphite aluminum is 2mm to 2.8mm; the height of the "well"-shaped ribs is 2mm to 4mm, ensuring that the graphene-based phase change composite material is not penetrated by the ribs in the thickness direction, so that it cannot form a "thermal bridge", and the distance between the top of the "well"-shaped ribs and the edge of the bottom shell is 5mm to 10mm, ensuring that the graphene-based phase change composite material is not penetrated by the ribs in the in-plane direction, avoiding the formation of a "thermal bridge"; the cylinder is a gradient design, with a large diameter of 8mm to 12mm, a height the same as the thickness of the graphene-based phase change composite material, a large diameter difference of 2mm between the large diameter and the small diameter, a small diameter of 6mm to 10mm, and a height the same as the thickness of the upper plate.

[0015] The graphene-based phase change composite material uses an ordered graphene porous skeleton as the matrix material of the phase change composite material. The ordered porous graphene macrobody is characterized by anisotropic thermal conductivity and high porosity. At a high porosity of 93%, the thermal conductivity in the in-plane direction can reach 60W / (m K) or more, which is much higher than the existing graphene skeleton material; the phase change material is an organic alkane phase change material with a latent heat value greater than 240J / g, which meets the requirements for latent heat value during periodic cyclic use; the overall thickness of the graphene-based phase change composite material is 14.4mm~20mm; there is a cross-shaped gap on the side of the graphene-based phase change composite material that is bonded to the cover plate, and the gap height and width are the same as the cross-shaped ribs of the upper plate; there is a "well"-shaped gap on the side of the graphene-based phase change composite material that is bonded to the bottom shell, and the gap height and width are the same as the "well"-shaped gap of the upper plate; there are 5 cylindrical holes in the graphene-based phase change composite material, and the hole diameter is 8mm~12mm. During processing, the large-sized graphene-based phase change composite blank is first processed so that it can match the packaging shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The use of high latent heat phase change materials increases the heat storage density and enhances the heat storage capacity when facing the heat dissipation of high-power electronic devices;

[0018] 2. By using ordered porous graphene macrobodies, the in-plane thermal conductivity is increased, and the surface heat flow of high-power electronic devices is efficiently transferred to the phase change material;

[0019] 3. Graphite aluminum material is used as the packaging shell in contact with the heat flow, which can reduce weight and achieve rapid heat transfer;

[0020] 4. The packaging structure has good mechanical properties, and the use of cylinders enhances its versatility in a variety of complex environments;

[0021] 5. The use of lightweight, high enthalpy, high in-plane thermal conductivity graphene-based phase change composite materials and graphite aluminum shells can achieve rapid heat transfer while reducing weight, volume and power consumption, meet the heat dissipation requirements of high-power devices that work periodically, and are easy to separate from the devices and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a packaging structure based on a graphene-based phase change composite material provided by an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the cover structure in the packaging structure shown;

[0024] Figure 3 yes Figure 1A schematic diagram of the structure of the graphene-based phase change composite material in the packaging structure shown in the figure, which contacts the cover plate;

[0025] Figure 4 yes Figure 1 A schematic diagram of the structure of the graphene-based phase change composite material in the packaging structure shown in the figure, which contacts the bottom shell;

[0026] Figure 5 yes Figure 1 Schematic diagram of the bottom shell structure in the packaging structure shown.

[0027] Figure 6 yes Figure 1 A partial enlarged schematic diagram of the corner of the bottom shell structure in the packaging structure shown.

[0028] The symbols in the accompanying drawings are explained as follows:

[0029] 1-cover plate, 2-graphene-based phase change composite material, 3-bottom shell;

[0030] 11-upper plate, 12-cross ribs, 13-circular holes of cover plate;

[0031] 21-ordered porous graphene macroscopic material, 22-phase change material, 23-cross-shaped gap, 24-cylindrical hole, 25-tic-tac-toe gap;

[0032] 31- bottom plate, 32- shell, 33- well-shaped ribs, 34- cylinder. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0035] To facilitate understanding of the embodiments of the present invention, further explanation will be given below by taking specific embodiments as examples in conjunction with the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0036] In order to solve the problem that a large amount of waste heat is generated during the periodic operation of high-power devices, causing the temporal and spatial accumulation of heat to lead to local high temperature, resulting in thermal failure of components, the packaging structure based on graphene-based phase change composite materials designed by the present invention is fixed on the surface of the heat flow area when used for thermal control of periodic high-power devices. Due to its high in-plane thermal conductivity and latent heat value, it can effectively ensure the thermal safety of the device while reducing the volume and weight of the cooling system. When the high-power device is on standby, the stored heat is released by active cooling, radiation heat dissipation and other methods, and this cycle is repeated. By using the theoretical analysis of the heat conduction equation and the numerical simulation method, the packaging structure design is optimized to finally obtain a lightweight graphene-based high enthalpy phase change composite packaging structure with high in-plane thermal conductivity.

[0037] (1) In order to achieve more efficient heat flow conduction capability, high thermal conductivity graphite aluminum material is used as the bottom plate of the metal packaging structure and graphene macro-bodies with high in-plane thermal conductivity are used as the skeleton material of the phase change material. Through the superposition configuration of high thermal conductivity graphite aluminum and graphene phase change composite materials, the heat flow in the high heat flux density area is quickly transferred to the large area low temperature area of ​​the graphene-based phase change composite packaging structure, so that the heat flow is more evenly distributed on the entire packaging structure surface, reducing the device temperature.

[0038] (2) Graphene-based phase change composite materials need to be designed according to the periodic heat flux density, working time and safety temperature requirements of electronic devices during operation. Phase change materials with high latent heat and good reversible solid-liquid phase transition cycle performance with different melting points should be used. Reasonable material and packaging shell size design should be carried out according to different heating value and temperature requirements to ensure that the total latent heat absorption value of the graphene-based phase change composite packaging structure is greater than the total heat release of the electronic device in one working cycle.

[0039] In one embodiment, if Figure 1 As shown, the present invention provides a packaging structure based on a graphene-based phase change composite material, and the graphene-based phase change composite material packaging structure includes a cover plate 1, a graphene-based phase change composite material 2, and a bottom shell 3.

[0040] like Figure 2 As shown, the cover plate 1 includes an upper plate 11 and a cross-shaped rib 12 arranged on one side of the upper plate 11, and a plurality of circular holes 13 are opened on the upper plate 11;

[0041] like Figure 3 and Figure 4As shown, the graphene-based phase change composite material 2 includes an ordered porous graphene macroscopic material 21 and a phase change material 22 embedded in the ordered porous graphene macroscopic material 21; a cross-shaped gap 23 adapted to the cross-shaped ribs 12 is provided on the side of the graphene-based phase change composite material 2 that is bonded to the cover plate 1; a tic-tac-toe-shaped gap 25 is provided on the side of the graphene-based phase change composite material 2 that is bonded to the bottom shell 3, and a plurality of cylindrical holes 24 are opened on the graphene-based phase change composite material 2;

[0042] like Figure 5 As shown, the bottom shell 3 includes a bottom plate 31, a surrounding shell 32 arranged around the bottom plate 31, and a tic-tac-toe rib 33 and a cylinder 34 arranged on the bottom plate 31 and adapted to the tic-tac-toe gap 25;

[0043] The positions and sizes of the circular hole 13 , the cylindrical hole 24 and the cylinder 34 are adapted to each other.

[0044] In this embodiment, the cover plate 1 is made of metal aluminum or graphite aluminum, and metal aluminum is preferred for low cost. The thickness of the upper plate 11 can be determined according to the usage. To ensure that the overall density of the graphene-based phase change composite material packaging structure is less than 1.5 g / cm 3 The preferred thickness is 2.8 mm, and the length and width are not less than 394.4 mm; the thickness of the cross-shaped rib 12 can be determined according to the usage, in order to ensure that the overall density of the graphene-based phase change composite material packaging structure is less than 1.5 g / cm 3 The preferred thickness is 1mm, and the height of the cross-shaped ribs 12 is 2mm to 4mm, which ensures that the graphene-based phase change composite material is not penetrated by the ribs in the thickness direction. There are no ribs in the graphene-based phase change composite material in the middle part, so that it cannot form a "thermal bridge", and the heat will not be directly transferred to the other side through the ribs. The preferred height of the cross-shaped ribs is 4mm; the distance between the top of the cross-shaped rib 12 and the edge of the cover plate is 5mm to 10mm. In order to ensure that the graphene-based phase change composite material is not penetrated by the cross-shaped ribs in the in-plane direction and avoid the formation of a "thermal bridge", the preferred distance is 10mm; the presence of the cross-shaped ribs 12 can enhance the mechanical strength on the one hand, and increase the in-plane thermal conductivity of the graphene-based phase change composite material packaging structure on the other hand; there is a fillet at the connection between the cross-shaped ribs 12 and the upper plate 11, and the preferred fillet radius is 0.5mm; the diameter of the circular hole 13 is 6mm to 10mm, and different diameters correspond to different sizes of the cylinder 34, and the preferred diameter is 10mm.

[0045] In this embodiment, the graphene-based phase change composite material 2 is a composite material of an ordered porous graphene macroscopic material 21 and a phase change material 22, with a thickness of 14.4 mm to 20 mm, and a preferred thickness of 14.4 mm; the ordered porous graphene macroscopic material 21 has a high in-plane thermal conductivity, a thickness of 14.4 mm to 20 mm, and a preferred thickness of 14.4 mm; the ordered porous graphene macroscopic material 21 has a high porosity, a porosity greater than 0.9, and a preferred porosity of 0.93; the phase change material 22 can select phase change materials with different melting points, preferably an alkane organic phase change material with a latent heat value of not less than 240 J / g, which satisfies the latent heat value change after 1000 melting and solidification cycles. The value does not exceed 20%; the ordered porous graphene macroscopic material 21 with a porosity of 0.93 and the alkane organic phase change material with a latent heat value of 240J / g can ensure that the overall latent heat value of the graphene-based phase change composite material 2 reaches 220J / g; the graphene-based phase change composite material 2 has a cross-shaped gap 23 on the side that is bonded to the cover plate 1, and the gap height and width are the same as the cross-shaped ribs of the upper plate, and the graphene-based phase change composite material 2 has a well-shaped gap 25 on the side that is bonded to the bottom shell 3, and the gap height and width are the same as the well-shaped ribs of the bottom shell; there are 5 cylindrical holes 24 in the graphene-based phase change composite material 2, and the hole diameter is 8mm~12mm, and different diameters correspond to different sizes of the cylinder 34, and the preferred diameter is 12mm.

[0046] In this embodiment, the bottom shell 3 is made of aluminum alloy and graphite aluminum, wherein the bottom plate 31 is made of graphite aluminum with a thickness of 2 mm to 2.8 mm, preferably 2.8 mm, and the rest of the material is aluminum; the surrounding shell 32 is made of aluminum alloy, and the enlarged view of the corners is as shown in FIG. Figure 6 As shown in the figure, the thickness of the shell is inconsistent, and the thickness is smaller where it contacts the cover plate 1, in order to facilitate the placement and welding of the cover plate; the height of the well-shaped ribs 33 is 2mm to 4mm, and the preferred height is 4mm to ensure that the graphene-based phase change composite material is not penetrated by the ribs in the thickness direction, so that it cannot form a "thermal bridge"; the thickness of the well-shaped ribs 33 can be determined according to the usage, in order to ensure that the overall density of the graphene-based phase change composite material packaging structure is less than 1.5g / cm 3 , the preferred thickness is 1mm; the distance between the top of the criss-cross rib 33 and the edge of the bottom shell is 5mm~10mm. In order to ensure that the graphene-based phase change composite material is not penetrated by the ribs in the in-plane direction and avoid the formation of a "thermal bridge", the preferred distance is 10mm; the cylinder 33 is a gradient design, the major diameter is 8mm~12mm, the height is the same as the thickness of the graphene-based phase change composite material 2, the major diameter and the minor diameter differ by 2mm, the minor diameter is 6mm~10mm, and the height is the same as the thickness of the upper plate 11.

[0047] The high-performance, lightweight, fast-response, high-enthalpy phase change composite material of the present invention is an advanced thermal management material that integrates rapid heat conduction and the "peak shaving and valley filling" effect of heat. The core idea of ​​phase change energy storage thermal management is to utilize the reversible solid-liquid phase transition of phase change materials to absorb and release heat and maintain its own temperature unchanged, thereby realizing the "peak shaving and valley filling" management of thermal energy. The basic design idea of ​​graphene phase change composite materials is to utilize the significant capillary force of low-density, high-thermal conductivity graphene assemblies to absorb molten high-enthalpy phase change materials, and obtain them through condensation and solidification, thereby obtaining lightweight, high-enthalpy, and high-thermal conductivity graphene-based phase change composite materials. After packaging, graphene-based phase change composite materials can be directly applied to the thermal management of high-power devices that work periodically, providing a solid guarantee for the thermal safety and miniaturization of high-power weapons and equipment that work periodically.

[0048] The technical solutions provided by the present disclosure are described in detail above in combination with specific embodiments. Meanwhile, the description of the above embodiments is only used to help understand the method and core idea of ​​the present disclosure. For those skilled in the art, according to the idea of ​​the present disclosure, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be understood as limiting the present disclosure.

Claims

1. A packaging structure based on a graphene-based phase change composite material, characterized in that: From top to bottom, they are a cover plate (1), a graphene-based phase change composite material (2), and a bottom shell (3); The cover plate (1) comprises an upper plate (11) and a cross-shaped rib (12) arranged on one side of the upper plate (11); a plurality of circular holes (13) are opened on the upper plate (11); The graphene-based phase change composite material (2) comprises an ordered porous graphene macroscopic material (21) and a phase change material (22) embedded in the ordered porous graphene macroscopic material (21); a cross-shaped gap (23) adapted to the cross-shaped rib (12) is provided on one side of the graphene-based phase change composite material (2) that is bonded to the cover plate (1); a tic-tac-toe-shaped gap (25) is provided on one side of the graphene-based phase change composite material (2) that is bonded to the bottom shell (3); and a plurality of cylindrical holes (24) are provided on the graphene-based phase change composite material (2); The bottom shell (3) comprises a bottom plate (31), a surrounding shell (32) arranged around the bottom plate (31), and ribs (33) and columns (34) arranged on the bottom plate (31) and adapted to the tic-tac-toe slits (25); The positions and sizes of the circular hole (13), the cylindrical hole (24) and the cylinder (34) are adapted to each other.

2. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The upper plate (11) and the cross-shaped ribs (12) are made of metal aluminum or a graphite aluminum composite material, and the upper plate (11) is provided with five circular holes (13).

3. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The ordered porous graphene macroscopic material (21) is a porous graphene foam with anisotropic thermal conductivity and a high in-plane thermal conductivity; the phase change material (22) is an alkane organic phase change material.

4. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The porosity of the ordered porous graphene macroscopic material (21) is greater than 0.

9.

5. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The material of the bottom plate (31) is a graphite aluminum composite material, and the material of the surrounding shell (32), the crisscross ribs (33) and the cylinder (34) is an aluminum alloy.

6. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The thickness of the upper plate (11) is 2 mm to 2.8 mm, the height of the cross-shaped rib (12) is 2 mm to 4 mm, the distance between the top of the cross-shaped rib (12) and the edge of the upper plate is 5 mm to 10 mm, and the diameter of the circular hole (13) is 6 mm to 10 mm.

7. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The bottom plate (31) has a thickness of 2 mm to 2.8 mm, the height of the criss-cross ribs (33) is 2 mm to 4 mm, the top of the criss-cross ribs (33) is 5 mm to 10 mm away from the edge of the bottom shell, the cylinder (34) is of gradient design, the major diameter is 8 mm to 12 mm, the height is the same as the thickness of the graphene-based phase change composite material (2), the major diameter differs from the minor diameter by 2 mm, the minor diameter is 6 mm to 10 mm, and the height is the same as the thickness of the upper plate (11).

8. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The overall thickness of the graphene-based phase change composite material (2) is 14.4 mm to 20 mm; there are 5 cylindrical holes (24) in the graphene-based phase change composite material (2), and the diameter of the cylindrical holes is 8 mm to 12 mm.

9. The packaging structure based on graphene-based phase change composite material according to claim 1, characterized in that: The packaging structure based on the graphene-based phase change composite material is in the shape of a rectangular parallelepiped as a whole, wherein the length and width are the same and the size is greater than 400 mm.

10. The application of the graphene-based phase change composite material packaging structure according to any one of claims 1 to 9, characterized in that: The invention is used for thermal management of high-power electronic devices that work periodically. When the high-power electronic devices are working, the bottom shell of the packaging structure is fixed to the surface of the heat flow area of ​​the high-power electronic devices. The heat generated by the high-power devices is transferred to the graphene-based phase change composite material by heat conduction. Most of the heat is stored in the graphene-based phase change composite material by latent heat. When the high-power devices are on standby, the stored heat is released by active cooling and radiation heat dissipation, and the cycle repeats. The thermal safety of high-power electronic devices can be effectively guaranteed while reducing the volume and weight of the cooling system.

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