Graphite film and its manufacturing process

Abstract

The present invention discloses a graphite film and a manufacturing process thereof, wherein the graphite film comprises: a graphite layer, the graphite layer being made of graphite material, the graphite layer comprising a first surface and a second surface arranged opposite to each other, the edge of the first surface being inclined toward the edge of the second surface so that the sidewall surface of the graphite layer is an inclined surface; a single-sided adhesive layer, the single-sided adhesive layer being attached to the surface of the first surface; a first double-sided adhesive layer, the first double-sided adhesive layer being attached to the surface of the second surface; the single-sided adhesive layer being attached along the inclined surface and being bonded to the first double-sided adhesive layer; and / or the first double-sided adhesive layer being attached along the inclined surface and being bonded to the single-sided adhesive layer. The technical solution of the present invention is conducive to improving the flatness of the hemming area of ​​the graphite film.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite films, and in particular to a graphite film and a manufacturing process thereof. Background Art

[0002] With the development of communications equipment, especially 5G, the power consumption of communications and consumer electronics is increasing. Consequently, the thickness of thermally conductive graphite and graphene films used in these products has gradually increased from a maximum of 0.1mm to 0.2mm or even 1.0mm. Increasing thermal conductivity by increasing thickness can lead to poor appearance, edge bubbles, and delamination defects in these films. Summary of the Invention

[0003] The main purpose of the present invention is to provide a graphite film, aiming to improve the flatness of the appearance of the graphite film and avoid the formation of bubbles.

[0004] To achieve the above-mentioned purpose, the graphite film proposed in the present invention comprises:

[0005] A graphite layer, wherein the graphite layer is made of graphite material, and comprises a first surface and a second surface arranged opposite to each other, wherein an edge of the first surface is inclined toward an edge of the second surface, so that a sidewall surface of the graphite layer is an inclined surface;

[0006] a single-sided adhesive layer, the single-sided adhesive layer being attached to the surface of the first layer;

[0007] a first double-sided adhesive layer, the first double-sided adhesive layer being attached to a surface of the second layer;

[0008] The single-sided adhesive layer is attached along the inclined surface and adheres to the first double-sided adhesive layer; and / or,

[0009] The first double-sided adhesive layer is attached along the inclined surface and adheres to the single-sided adhesive layer.

[0010] Optionally, the area of ​​the first plane is smaller than the area of ​​the second plane, and is located in the middle of the second plane, and the inclined surface extends from the edge of the first plane in the middle to the edge of the surrounding second plane.

[0011] Optionally, the connection between the side wall surface of the graphite layer and the first layer surface is connected through an arc transition, and the arc is a convex arc.

[0012] Optionally, the graphite layer includes a plurality of graphite sub-layers, the plurality of graphite sub-layers are stacked, and a second double-sided adhesive layer is provided between two adjacent graphite sub-layers.

[0013] Optionally, the inclined surface includes one or more of an arc surface, a curved surface and a flat surface.

[0014] Optionally, the angle between the inclined surface and the second plane surface is 10° to 45°.

[0015] Optionally, the connection between the side wall surface of the graphite layer and the second layer surface is connected by an arc transition, and the arc is a concave arc.

[0016] The present invention also proposes an ink layer forming punch, which is used to manufacture the graphite layer of the graphite film. The graphite layer forming punch includes a forming end and an installation section. The end of the forming end has a forming surface, and the forming surface includes a horizontal stamping surface and a forming extrusion surface inclined to the horizontal stamping surface.

[0017] Optionally, the horizontal stamping surface and the forming extrusion surface are transitionally connected via an arc surface.

[0018] The present invention also provides an electronic product, which includes a graphite film;

[0019] Among them, graphite film includes:

[0020] A graphite layer, wherein the graphite layer is made of graphite material, and comprises a first surface and a second surface arranged opposite to each other, wherein an edge of the first surface is inclined toward an edge of the second surface, so that a sidewall surface of the graphite layer is an inclined surface;

[0021] a single-sided adhesive layer, the single-sided adhesive layer being attached to the surface of the first layer;

[0022] a first double-sided adhesive layer, the first double-sided adhesive layer being attached to a surface of the second layer;

[0023] The single-sided adhesive layer is attached along the inclined surface and adheres to the first double-sided adhesive layer; and / or,

[0024] The first double-sided adhesive layer is attached along the inclined surface and adheres to the single-sided adhesive layer.

[0025] The present invention also provides a process for manufacturing a graphite film, comprising the following steps:

[0026] Producing a graphite layer with an inclined sidewall, the graphite layer comprising a first layer and a second layer disposed opposite to each other, wherein an edge of the first layer is inclined toward an edge of the second layer, so that the sidewall of the graphite layer is an inclined surface;

[0027] Obtaining a single-sided adhesive layer and attaching the single-sided adhesive layer to the surface of the first layer;

[0028] Obtaining a first double-sided adhesive layer and attaching the first double-sided adhesive layer to the surface of the second layer;

[0029] attaching the single-sided adhesive layer along the inclined surface and adhering it to the first double-sided adhesive layer; and / or,

[0030] The first double-sided adhesive layer is attached along the inclined surface and adhered to the single-sided adhesive layer.

[0031] Optionally, the step of manufacturing a graphite layer with an inclined sidewall surface includes:

[0032] Use a single-edged knife to die-cut the overall shape of the graphite material;

[0033] Using a graphite layer forming punch to extrude the graphite material so that the edge of the cut graphite layer forms an inclined surface; or,

[0034] The graphite material is extruded using a graphite layer forming punch so that the edge of the graphite layer forms an inclined surface;

[0035] Use a single-edged knife to die-cut the overall shape of the graphite material.

[0036] Optionally, before the step of using a single-edged knife to die-cut the overall shape of the graphite material and the step of using a graphite layer forming punch to extrude the graphite material so that the edge of the graphite layer forms an inclined surface, the method further includes:

[0037] The graphite layer includes a plurality of graphite sub-layers, and the plurality of graphite sub-layers are stacked via a second double-sided adhesive layer.

[0038] In the technical solution of the present invention, by setting the side walls of the graphite layer to be inclined compared to the first and second planes, the single-sided adhesive layer or the first double-sided adhesive layer can completely cover the inclined side walls before attachment. Therefore, even when the thickness of the graphite layer is greatly increased, the single-sided adhesive layer or the first double-sided adhesive layer can completely cover the side walls, avoiding the formation of bubbles between the single-sided adhesive layer and the side walls, or between the first double-sided adhesive layer and the side walls, which is beneficial to improving the integrity of the graphite film, making the edge area of ​​the graphite film smooth, avoiding delamination of the graphite layer, and improving the fit tightness of the upper and lower materials, which is beneficial to precise installation in electronic products, and is beneficial to improving the assembly accuracy of the graphite film, as well as improving the installation accuracy and working stability of electronic products. At the same time, compared with the existing solution, it is equivalent to filling the original bubble position with graphite layer material (graphite or graphene), increasing the surface area of ​​the graphite material, which is beneficial to improving the heat dissipation efficiency of the graphite film, and is beneficial to better heat dissipation of electronic products, and is beneficial to improving the working stability and reliability of electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 Schematic diagram of the structure of a graphite film according to an embodiment of the present invention;

[0041] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0042] Figure 3 Schematic diagram of the structure of a graphite layer of a graphite film according to an embodiment of the present invention;

[0043] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at the middle BB;

[0044] Figure 5 for Figure 4 A partial enlarged view of point E in the middle;

[0045] Figure 6 This is a schematic structural diagram of an embodiment of a forming punch of the present invention;

[0046] Figure 7 for Figure 6 Schematic diagram of the cross-section structure at CC;

[0047] Figure 8 for Figure 7 A partial enlarged view of point F in the middle;

[0048] Figure 9 Schematic diagram of the structure of another embodiment of the graphite layer of the graphite film of the present invention;

[0049] Figure 10 Schematic diagram of the process for manufacturing the graphite film of the present invention.

[0050] Description of Figure Numbers:

[0051] Label name Label name 10 graphite film 100 Single-sided adhesive layer 200 Graphite layer 300 Double-sided tape 210 First level 220 Second level 230 Inclined surface 250、260 Arc transition surface 500 Forming punch 510 Stamping plane 520 Extruded Bevel 530 Arc transition surface 270 Graphene sublayer

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] The present invention primarily provides a graphite film 10, which is primarily used in electronic products to aid in heat dissipation. By configuring the sidewalls of the graphite layer 200 as inclined surfaces 230, the double-sided or single-sided adhesive layer 100 can be perfectly bonded to the sidewalls of the graphite layer 200, thereby preventing the formation of bubbles and delamination on the sidewalls of the graphite layer 200. This improves the overall shape of the graphite film 10, increases space utilization, and increases the surface area of ​​the graphite layer 200, thereby facilitating better heat dissipation.

[0057] The specific structure of the graphite film 10 will be mainly described below.

[0058] Reference Figures 1 to 10 In an embodiment of the present invention, the graphite film 10 includes:

[0059] The graphite layer 200 is made of graphite and includes a first surface 210 and a second surface 220 that are oppositely disposed. The edge of the first surface 210 is inclined toward the edge of the second surface 220, such that the sidewall surface of the graphite layer 200 is an inclined surface 230.

[0060] A single-sided adhesive layer 100 , the single-sided adhesive layer 100 being attached to the surface of the first layer 210 ;

[0061] A first double-sided adhesive layer 300 , the first double-sided adhesive layer 300 being attached to a surface of the second layer 220 ;

[0062] The single-sided adhesive layer 100 is attached along the inclined surface 230 and adhered to the first double-sided adhesive layer 300; and / or,

[0063] The first double-sided adhesive layer 300 is attached along the inclined surface 230 and adheres to the single-sided adhesive layer 100 .

[0064] Specifically, in this embodiment, the graphite material includes graphite, graphene material, artificial synthetic graphite film material, natural graphite film, etc., and the graphite layer may include one or more of the above materials. The graphite layer can be in a single layer form or in a multi-layer stacked form. When the graphite layer is formed by stacking multiple layers of graphite materials, adjacent material layers are bonded together by double-sided tape. Among them, the thickness of the graphite layer can be many, such as 0.1 to 2 mm, that is, the maximum thickness can reach 2 mm. Of course, in some special actual situations, the thickness of the graphite layer can be thicker, such as 0.1 to 3 mm. Graphite materials that can be used for heat dissipation in electronic products. The overall shape of the graphite layer 200 can be various, such as circular, square, rectangular, triangular and other shapes. In this embodiment, a rectangular setting is taken as an example. The graphite layer 200 can be a flat layered structure, for example, with two sides with larger areas, namely the first layer 210 and the second layer 220. Multiple sidewalls are provided between the first and second layers 210, 220, connecting the edges of the first and second layers 210, 220. The first and second layers 210, 220, and the multiple sidewalls together constitute the entire outer surface of the graphite layer 200. Depending on the working conditions, the inclined surfaces 230 can be tilted in various ways, with the tilt directions and angles of the multiple inclined surfaces 230 being the same or different. For example, some inclined surfaces 230 can have an acute angle with the first layer 210, while others can have an obtuse angle. For example, when the inclined surfaces 230 are arranged at an acute angle with the second layer 220, the angle can range from 5° to 75°, with 10° to 45° being an example. If the angle is too small, the inclined surface 230 becomes too long, significantly reducing its strength and increasing processing difficulty. If the angle is too large, the angle at which the inclined surface 230 connects to the second layer 220 becomes larger, making it more susceptible to bubbles and delamination.

[0065] The single-sided adhesive layer 100 is an insulating film made of an insulating material, one side of which is non-adhesive and the other side is adhesive. The adhesive side of the single-sided adhesive layer 100 is attached to the surface of the first layer 210 and bonded thereto. The first double-sided adhesive layer 300 has adhesive properties on both sides, and one side thereof is bonded and fixed to the second layer 220 of the graphite layer 200. The specific structure of the graphite film 10 is described below with an example. The second layer 220 of the graphite layer 200 is facing upward, and the first double-sided adhesive layer 300 is bonded thereto; the first layer 210 is facing upward, and the single-sided adhesive layer 100 is bonded thereto. The single-sided adhesive layer 100 corresponds to the edge of the first layer 210 and is attached along the inclined surface 230 from top to bottom. After completely covering the inclined surface 230, it is bonded to the side of the first double-sided adhesive layer 300 facing the second layer 220. Of course, in some embodiments, under special working conditions, the first double-sided adhesive layer 300 can also be attached from bottom to top along the inclined surface 230, and after completely covering the inclined surface 230, the first double-sided adhesive layer 300 can be attached from bottom to top along the inclined surface 230.

[0066] In this embodiment, by setting the side wall of the graphite layer 200 to be inclined relative to the first plane 210 and the second plane 220, the single-sided adhesive layer 100 or the first double-sided adhesive layer 300 can completely cover the inclined side wall before being attached. Therefore, even if the thickness of the graphite layer 200 is greatly increased, the single-sided adhesive layer 100 or the first double-sided adhesive layer 300 can completely cover the side wall, avoiding the formation of bubbles between the single-sided adhesive layer 100 and the side wall, or between the first double-sided adhesive layer 300 and the side wall, which is beneficial to improving the integrity of the graphite film 10 and making the graphite film 10 more compact. The edge area of ​​the film 10 is flat, which avoids the delamination of the graphite layer 200, is conducive to improving the fit of the upper and lower materials, is conducive to precise installation in electronic products, is conducive to improving the assembly accuracy of the graphite film 10, and improves the installation accuracy and working stability of electronic products; at the same time, compared with the existing solutions, it is equivalent to filling the original bubble position with graphite layer 200 material (graphite or graphene), increasing the surface area of ​​the graphite material, which is conducive to improving the heat dissipation efficiency of the graphite film 10, is conducive to better heat dissipation of electronic products, and is conducive to improving the stability and reliability of the operation of electronic products.

[0067] In some embodiments, to better cover the inclined surface 230, the area of ​​the first layer 210 is smaller than that of the second layer 220 and is located in the middle of the second layer 220. The inclined surface 230 extends from the edge of the first layer 210 in the middle to the edges of the surrounding second layers 220. Specifically, in this embodiment, taking the example of the first layer 210 being located directly above the second layer 220, the first layer 210 is located in the middle of the second layer 220, such that the edge of the first layer 210 is tilted downward toward the edge of the second layer 220, and the inclined surface 230 extends downward from the middle (top) to the surrounding edges. This ensures that the single-sided adhesive layer 100 effectively covers all inclined sidewalls and adheres to the first double-sided adhesive layer 300.

[0068] In some embodiments, to better cover the inclined surface 230, the sidewall surface of the graphite layer 200 is connected to the first layer 210 via a convex arc transition surface 250. This arrangement allows for a very good transition between the first layer 210 and the side avoidance surface, preventing loose adhesion at the connection between the two, thereby improving the adhesion between the single-sided adhesive layer 100, the first layer 210, and the sidewall surface.

[0069] In other embodiments, to better cover the inclined surface 230, the sidewall surface of the graphite layer 200 and the second layer 220 are connected by a concave arc transition surface 260. This arrangement allows for a very good transition between the second layer 220 and the side avoidance surface, preventing loose adhesion at the connection between the two, thereby improving the adhesion between the single-sided adhesive layer 100, the second layer 220, and the sidewall surface.

[0070] In some cases, in order to increase the thickness of the graphite layer 200 or improve the performance of the graphite layer 200, the graphite layer 200 includes multiple graphite sub-layers 270, which are stacked and a second double-sided adhesive layer is provided between two adjacent graphite sub-layers 270. The material of the graphite sub-layers 270 can be the same. In some embodiments, in order to adjust the performance of the overall graphite layer 200, the materials of the graphite sub-layers 270 can also be set to different. Adjacent graphite sub-layers 270 can be bonded and fixed by the second double-sided adhesive layer. The thickness of the second double-sided adhesive layer is very thin and is only used to bond adjacent graphite sub-layers 270.

[0071] The inclined surface 230 can be in many forms, including one or more of an arc surface, a curved surface, and a flat surface. It only needs to maintain a large inclination trend that is conducive to the attachment of the single-sided adhesive layer 100 or the first double-sided adhesive layer 300.

[0072] In some embodiments, in order to better form the graphite layer 200, the present application further proposes a graphite layer 200 forming punch 500, which is used to manufacture a graphite layer 200 such as the graphite film 10 in the above-mentioned embodiment. The specific structure of the graphite film 10 refers to the above-mentioned embodiment. Since the graphite layer 200 forming punch 500 is used to manufacture the graphite layer 200, it includes all the technical solutions of all the above-mentioned embodiments, and therefore has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The graphite layer 200 forming punch 500 includes a forming end and a mounting section, and the end of the forming end has a forming surface, and the forming surface includes a horizontal stamping surface and a forming extrusion surface inclined to the horizontal stamping surface. In this embodiment, the horizontal stamping surface and the forming extrusion surface are arranged at an angle greater than 90°. Taking 135° to 170° as an example, at this time, the angle between the inclined surface 230 and the second plane 220 is 10° to 45°.

[0073] In some embodiments, to further achieve a smoother transition between the outer surface of the graphite layer 200, the horizontal stamping surface and the formed extrusion surface are transitionally connected via an arc transition surface 530. By providing an arc surface between the horizontal stamping surface and the formed extrusion surface, the first layer 210 and the side wall surface of the extruded graphite layer 200 are transitionally connected via an arc.

[0074] In some embodiments, in order to better manufacture the graphite film 10, the present application further proposes a forming process of the graphite film 10, comprising the following steps:

[0075] A graphite layer 200 with an inclined sidewall is produced, wherein the graphite layer 200 includes a first layer 210 and a second layer 220 that are oppositely disposed, and an edge of the first layer 210 is inclined toward an edge of the second layer 220, so that the sidewall of the graphite layer 200 is an inclined surface 230;

[0076] Obtain a single-sided adhesive layer 100 and attach the single-sided adhesive layer 100 to the surface of the first layer 210;

[0077] Obtain a first double-sided adhesive layer 300 and attach the first double-sided adhesive layer 300 to the surface of the second layer 220;

[0078] Attaching the single-sided adhesive layer 100 along the inclined surface 230 and laminating it with the first double-sided adhesive layer 300; and / or,

[0079] The first double-sided adhesive layer 300 is attached along the inclined surface 230 and adhered to the single-sided adhesive layer 100 .

[0080] Specifically, in this embodiment, a graphite layer 200 is first manufactured. The side avoidance surface of the graphite layer 200 is tilted relative to the first plane 210 and the second plane 220. The specific structure of the graphite layer 200 can refer to the above embodiment. Corresponding to the shape and size of the graphite layer 200, a corresponding single-sided adhesive layer 100 (insulating layer) is prepared. The area of ​​the single-sided adhesive layer 100 is larger than the area of ​​the first plane 210, and the edge of the single-sided adhesive layer 100 protrudes from the edge of the first plane 210. Similarly, corresponding to the shape and size of the graphite layer 200, a corresponding first double-sided adhesive layer 300 is prepared. The area of ​​the first double-sided adhesive layer 300 is larger than the area of ​​the second plane 220, and the edge of the first double-sided adhesive layer 300 protrudes from the edge of the second plane 220. It is worth noting that there is no need to have a specific order for obtaining the first double-sided adhesive layer 300 and obtaining the single-sided adhesive layer 100, that is, there is no limit on the order of obtaining the first double-sided adhesive layer 300 and the single-sided adhesive layer 100. The specific formation process of the graphite film 10 is described below by example. Lay the first double-sided adhesive layer 300 flat, place the graphite layer 200 on the first double-sided adhesive layer 300, so that the edge of the first double-sided adhesive layer 300 extends out of the edge of the second surface 220; cover the single-sided adhesive layer 100 on the first surface 210, so that the single-sided adhesive layer 100 extends out of the edge of the first surface 210; attach the portion of the single-sided adhesive layer 100 extending out of the first surface 210 to the side wall surface, and then adhere it to the first double-sided adhesive layer 300. This is beneficial to improving the integrity of the graphite film 10, making the edge area of ​​the graphite film 10 smooth, avoiding stratification of the graphite layer 200, and improving the fit of the upper and lower materials, which is conducive to precise installation in electronic products, and is beneficial to improving the assembly accuracy of the graphite film 10, as well as improving the installation accuracy and working stability of electronic products; at the same time, compared with the existing solutions, it is equivalent to filling the original bubble position with graphite layer 200 material (graphite or graphene), increasing the surface area of ​​the graphite material, which is beneficial to improving the heat dissipation efficiency of the graphite film 10, and is conducive to better heat dissipation of electronic products, and is conducive to improving the stability and reliability of the operation of electronic products.

[0081] Regarding the production of the graphite layer 200, the steps of producing the graphite layer 200 with an inclined sidewall surface include:

[0082] Use a single-edged knife to die-cut the overall shape of the graphite material;

[0083] The graphite material is squeezed using the graphite layer 200 forming punch 500 so that the edge of the cut graphite layer 200 forms an inclined surface 230; or,

[0084] The graphite material is extruded using a graphite layer 200 forming punch 500 so that an edge of the graphite layer 200 forms an inclined surface 230 ;

[0085] Use a single-edged knife to die-cut the overall shape of the graphite material.

[0086] Specifically, in this embodiment, a single-edged knife can be used to die-cut the overall shape of the graphite material. The die-cut graphite material is then extruded using the graphite layer 200 forming punch 500 to form the inclined surface 230 on the sidewall of the graphite layer 200. The single-edged knife has a tool angle of 20° to 50°. Once the graphite material has the inclined surface 230, further cutting and other processes are no longer necessary. This ensures that the shape and structure of the extruded graphite layer 200 remain intact, facilitating the convenient and efficient production of the graphite layer 200.

[0087] Of course, in some embodiments, the graphite material can be first extruded using the graphite layer 200 forming punch 500 to form the inclined surface 230 at the edge of the graphite layer 200; then, a single-edged knife can be used to die-cut the overall shape of the graphite material. Similarly, the single-edged knife's cutting angle is between 20° and 50°. This eliminates the need for other processes to affect the dimensions of the graphite layer 200 after die-cutting, resulting in highly accurate dimensional accuracy of the graphite layer 200 and facilitating efficient, high-quality production of the graphite layer 200.

[0088] In some embodiments, the graphite layer 200 is formed by stacking multiple graphite sub-layers 270. In this case, in order to improve processing efficiency, before the step of using a single-edged knife to die-cut the overall shape of the graphite material and the step of using a graphite layer 200 forming punch 500 to extrude the graphite material so that the edge of the graphite layer 200 forms an inclined surface 230, the following steps are further included: the graphite layer 200 includes multiple graphite sub-layers 270, and the multiple graphite sub-layers 270 are stacked and arranged through a second double-sided adhesive layer. That is, before cutting or extruding the graphite layer 200, the structure of the graphite layer 200 itself is first determined so that all the graphite sub-layers 270 can be uniformly processed in the subsequent process. This is conducive to significantly improving production efficiency and production accuracy.

[0089] The present invention also proposes an electronic product, which includes a graphite film 10. The specific structure of the graphite film 10 refers to the above embodiment. Since this electronic product adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0090] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A graphite film, characterized in that include: A graphite layer, wherein the graphite layer is made of graphite material, and comprises a first surface and a second surface arranged opposite to each other, wherein an edge of the first surface is inclined toward an edge of the second surface, so that a sidewall surface of the graphite layer is an inclined surface; a single-sided adhesive layer, the single-sided adhesive layer being attached to the surface of the first layer; a first double-sided adhesive layer, the first double-sided adhesive layer being attached to a surface of the second layer; The single-sided adhesive layer is attached along the inclined surface and adheres to the first double-sided adhesive layer; and / or, The first double-sided adhesive layer is attached along the inclined surface and adheres to the single-sided adhesive layer.

2. The graphite film according to claim 1, wherein The area of ​​the first plane is smaller than that of the second plane, and the first plane is located in the middle of the second plane. The inclined surface extends from the edge of the first plane in the middle to the edge of the surrounding second plane.

3. The graphite film according to claim 1, wherein The connection between the side wall surface of the graphite layer and the first layer surface is connected through an arc transition, and the arc is a convex arc.

4. The graphite film according to claim 1, wherein The graphite layer includes a plurality of graphite sub-layers, which are stacked and arranged, and a second double-sided adhesive layer is arranged between two adjacent graphite sub-layers.

5. The graphite film according to claim 1, wherein The inclined surface includes one or more of an arc surface, a curved surface and a flat surface.

6. The graphite film according to claim 1, wherein The angle between the inclined surface and the second plane surface is 10° to 45°.

7. The graphite film according to any one of claims 1 to 6, wherein The connection between the side wall surface of the graphite layer and the second layer surface is connected through an arc transition, and the arc is a concave arc.

8. A process for manufacturing a graphite film, characterized in that: The steps include: Producing a graphite layer with an inclined sidewall, the graphite layer comprising a first layer and a second layer disposed opposite to each other, wherein an edge of the first layer is inclined toward an edge of the second layer, so that the sidewall of the graphite layer is an inclined surface; Obtaining a single-sided adhesive layer, and attaching the single-sided adhesive layer to the surface of the first layer; Obtaining a first double-sided adhesive layer and attaching the first double-sided adhesive layer to the surface of the second layer; attaching the single-sided adhesive layer along the inclined surface and adhering it to the first double-sided adhesive layer; and / or, The first double-sided adhesive layer is attached along the inclined surface and adhered to the single-sided adhesive layer.

9. The process for manufacturing a graphite film according to claim 8, wherein: The steps of making a graphite layer with an inclined sidewall surface include: Use a single-edged knife to die-cut the overall shape of the graphite material; Using a graphite layer forming punch to extrude the graphite material so that the edge of the cut graphite layer forms an inclined surface; or, The graphite material is extruded using a graphite layer forming punch so that the edge of the graphite layer forms an inclined surface; Use a single-edged knife to die-cut the overall shape of the graphite material.

10. The process for manufacturing a graphite film according to claim 9, wherein: Before the step of using a single-edged knife to die-cut the overall shape of the graphite material and the step of using a graphite layer forming punch to extrude the graphite material so that the edge of the graphite layer forms an inclined surface, the method further includes: The graphite layer includes a plurality of graphite sub-layers, and the plurality of graphite sub-layers are stacked via a second double-sided adhesive layer.

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