Carbon fiber composite shell and its preparation method, electronic equipment

Abstract

This invention discloses a carbon fiber composite material shell, its preparation method, and an electronic device. The preparation method includes the following steps: preparing a carbon fiber composite material shell blank; removing resin from the welding area on the surface of the carbon fiber composite material shell blank to expose the welding surface of the carbon fiber composite material layer in the blank; and welding a metal insert to the welding surface. The technical solution of this invention overcomes the shortcomings of existing carbon fiber composite materials where surface features such as fixed structures cannot be directly formed on their surface.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to a carbon fiber composite shell, its preparation method, and electronic devices. Background Technology

[0002] Virtual reality (VR) and augmented reality (AR) are two major hot fields in recent years, both showing good development trends and application prospects. As a result, many virtual reality and augmented reality devices have emerged.

[0003] Since these devices are generally worn on the head, lightweight design is a crucial technical indicator for comfort. Currently, considering both structural strength and weight reduction requirements, the structural components of these devices (such as the temples and frames of AR glasses) are primarily made of plastics such as PC, PC / ABS, and PA. However, due to limitations in molding processes, most require injection molding, resulting in thicker walls and greater weight. Other lightweight plastic materials are insufficient to meet the strength design requirements.

[0004] Against this backdrop, carbon fiber composites have gradually developed. Due to their high strength and low density, they can simultaneously meet the strength and lightweight requirements of wearable devices with a very thin wall thickness, giving them a significant advantage. However, it is impossible to directly mold and fix structural features on the surface of carbon fiber composites. Summary of the Invention

[0005] The main objective of this invention is to solve at least one of the aforementioned technical problems. Therefore, this invention provides a carbon fiber composite material shell and its preparation method, as well as an electronic device, aiming to overcome the shortcomings of existing carbon fiber composite materials where surface features such as fixed structures cannot be directly formed on their surface.

[0006] To achieve the above objectives, the method for preparing a carbon fiber composite shell proposed in this invention includes the following steps:

[0007] Preparation of carbon fiber composite shell rough blank;

[0008] Remove the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank.

[0009] Metal inserts are welded to the welding surface.

[0010] In one embodiment of the present invention, the step of preparing the carbon fiber composite shell blank includes:

[0011] Provide carbon fiber tow;

[0012] Electroplating is performed on the carbon fiber bundles to coat the surface of the carbon fiber bundles with welding material, thereby obtaining the carbon fiber bundles to be formed.

[0013] The carbon fiber to be formed is shaped to obtain a rough blank of carbon fiber composite shell.

[0014] In one embodiment of the present invention, the step of preparing the carbon fiber composite shell blank includes:

[0015] Provides carbon fiber tow and welding material tow;

[0016] Carbon fiber bundles and welding material bundles are combined together to obtain a carbon fiber composite material layer;

[0017] The carbon fiber composite material layer is molded to obtain a rough blank of carbon fiber composite shell.

[0018] In one embodiment of the present invention, the step of preparing the carbon fiber composite shell blank includes:

[0019] Provide carbon fiber layers and welding material layers;

[0020] The carbon fiber layer and the welding material layer are laminated to obtain a carbon fiber composite material layer.

[0021] The carbon fiber composite material layer is molded to obtain a rough blank of carbon fiber composite shell.

[0022] In one embodiment of the present invention, the welding material layer is a welding material sheet, a unidirectional welding material, or a woven welding material.

[0023] In one embodiment of the present invention, the step of removing the resin from the weld area on the surface of the carbon fiber composite shell blank to expose the weld surface on the carbon fiber composite layer in the carbon fiber composite shell blank includes:

[0024] Remove the resin from the welded areas on the surface of the carbon fiber composite shell blank to expose the underlying carbon fiber layer;

[0025] Welding material is attached to the exposed carbon fiber layer to form a weld surface.

[0026] In one embodiment of the present invention, in the step of attaching welding material to the exposed carbon fiber layer to form a welding surface, the welding material is attached to the carbon fiber layer by electroplating or deposition.

[0027] In one embodiment of the present invention, in the step of welding the metal insert to the welding surface, the metal insert is welded to the welding surface by laser welding, ultrasonic welding or hot-press welding.

[0028] In one embodiment of the present invention, when the metal insert is welded to the welding surface by laser welding, the laser welding weld points are distributed in an array or circumferentially, and / or the diameter of the laser welding weld points is within 0.3 mm.

[0029] To achieve the above objectives, the carbon fiber composite shell proposed in this invention is prepared by a method for preparing a carbon fiber composite shell, the method comprising the following steps:

[0030] Preparation of carbon fiber composite shell rough blank;

[0031] Remove the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank.

[0032] Metal inserts are welded to the welding surface.

[0033] To achieve the above objectives, the electronic device proposed in this invention includes a carbon fiber composite material shell, which is prepared by a method for preparing a carbon fiber composite material shell, comprising the following steps:

[0034] Preparation of carbon fiber composite shell rough blank;

[0035] Remove the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank.

[0036] Metal inserts are welded to the welding surface.

[0037] The carbon fiber composite shell preparation method proposed in this invention is a novel molding process that introduces metal inserts into the carbon fiber composite material through welding. The introduction of metal inserts effectively solves the shortcomings of existing carbon fiber composite materials, such as the inability to directly mold and fix structural features on their surface. Furthermore, compared to molding processes that introduce metal inserts into carbon fiber composite materials through hot pressing, the carbon fiber composite shell preparation method proposed in this invention, by directly welding the metal inserts to the carbon fiber, significantly improves the stability of the metal inserts, thereby making the prepared carbon fiber composite shell more reliable. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic flowchart of the first embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0040] Figure 2 This is a schematic flowchart of the second embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0041] Figure 3 This is a schematic flowchart of the third embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0042] Figure 4 This is a schematic flowchart of the fourth embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0043] Figure 5 This is a schematic flowchart of the fifth embodiment of the method for preparing the carbon fiber composite shell of the present invention.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0047] In response to the technical problems mentioned in the background art, the present invention proposes a method for preparing a carbon fiber composite shell, aiming to solve the defect that existing carbon fiber composite materials cannot directly form and fix surface features such as structures on their surface.

[0048] The preparation method of the carbon fiber composite shell proposed in this invention will be described below in specific embodiments:

[0049] like Figure 1 The image shown is a first embodiment of the method for preparing the carbon fiber composite shell of the present invention. In this embodiment, the method for preparing the carbon fiber composite shell includes the following steps:

[0050] Step S100: Prepare a rough blank of carbon fiber composite shell;

[0051] Step S200: Remove the resin from the welding area on the surface of the carbon fiber composite shell blank so that the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank can be exposed.

[0052] Step S300: Weld the metal insert to the welding surface.

[0053] It should be noted that the carbon fiber composite shell blank is a shell structure composed of carbon fiber and resin, possessing both high strength and lightweight characteristics. This allows it to effectively meet the high strength and lightweight requirements of electronic devices, especially head-mounted devices (such as VR and AR devices). The carbon fiber can exist in either unidirectional or woven fabric form; furthermore, various strength grades are available, such as T300 and T700; and the carbon fiber can be laid up in either a single layer or multiple layers. As for the resin, both thermoplastic resins such as PC, PA, PP, and PEEK, and thermosetting resins such as epoxy resin can be selected. Additionally, various flame retardant grades are available, such as [V2] and [V0] flame retardant grades.

[0054] In one embodiment, to achieve a better appearance, the carbon fiber is in the form of a woven fabric with a 2×2 twill weave; meanwhile, the carbon fiber volume content in the carbon fiber composite shell blank is 45%.

[0055] In one embodiment, the carbon fiber is laid up in a four-layer structure, with each layer being 0.1 mm thick, for a total thickness of 0.4 mm. This not only ensures high strength and lightweight of the carbon fiber composite shell blank but also maintains a relatively low wall thickness, thus providing more internal space and a smaller external volume. Of course, the carbon fiber layup method can be adjusted in detail according to the strength, lightweight indicators, and wall thickness required in actual use, but the total thickness should be controlled within 0.5 mm.

[0056] Metal inserts are fixed to the inner and / or outer surfaces of a carbon fiber composite shell blank to form auxiliary structures, such as snap-fit ​​or other positioning and limiting structures. They can be formed from thin-walled, lightweight, high-strength metal sheets (e.g., titanium alloy, magnesium alloy, aluminum alloy, etc.) using methods such as stamping. Generally, the thickness of the metal sheet is controlled between 0.2mm and 0.4mm, which effectively meets the requirements of thin walls, lightweight, and high strength. Of course, metal inserts can also take other forms, such as knurled nuts or columnar structures.

[0057] Understandably, after the carbon fiber composite shell blank is fabricated, a welding area is marked on it for welding metal inserts. However, since the welding area is covered with resin at this time, welding cannot be performed directly. Therefore, the resin covering the welding area needs to be removed, which can be achieved using processes such as laser processing or chemical etching, to expose the welding surface on the resin-covered carbon fiber composite layer. Then, the metal insert can be welded to the welding surface, completing the connection between the metal insert and the carbon fiber.

[0058] Therefore, the carbon fiber composite shell preparation method proposed in this embodiment is a novel molding process that introduces metal inserts into carbon fiber composites through welding. The introduction of metal inserts effectively solves the shortcomings of existing carbon fiber composites, such as the inability to directly form and fix structural features on their surface. Furthermore, compared to molding processes that introduce metal inserts into carbon fiber composites through hot pressing, the carbon fiber composite shell preparation method proposed in this invention, by directly welding the metal inserts to the carbon fiber, greatly improves the stability of the metal inserts, thereby making the prepared carbon fiber composite shell more reliable.

[0059] Furthermore, it is understandable that after the welding of the metal inserts is completed, the resulting carbon fiber composite shell can be post-processed, such as CNC machining or laser processing, to achieve surface treatment and detail processing.

[0060] In addition, it should be noted that in the embodiments, the metal insert can be welded to the welding surface in a variety of ways, such as laser welding, ultrasonic welding, hot pressing welding, etc.

[0061] Preferably, the metal insert is welded to the welding surface using laser welding. Laser welding has advantages such as small weld points, precise welding, and stable welding, which can greatly reduce the impact of the welding process on the carbon fiber morphology, thereby reducing the likelihood of adverse effects on the product's performance and appearance.

[0062] Specifically, when metal inserts are laser-welded to the welding surface, the weld points can be arranged in an array or circumferentially: when the welding area is rectangular, the weld points are arranged in an array, for example, in two rows with 4 to 8 weld points per row; when the welding area is circular, the weld points are arranged circumferentially, for example, 4 to 10 weld points are arranged sequentially along the outer edge of the welding area. Furthermore, to further reduce the impact of the welding process on the carbon fiber morphology, the diameter of the laser-welded weld points is controlled to be within 0.3 mm, for example, the diameters of the laser-welded weld points are 0.3 mm, 0.25 mm, 0.2 mm, 0.15 mm, 0.1 mm, etc.

[0063] The following is a detailed description of how the weld surface on the carbon fiber composite material layer in the carbon fiber composite shell blank is formed in the first embodiment:

[0064] like Figure 2 The image shows a second embodiment of the method for preparing the carbon fiber composite shell of the present invention. The difference between this embodiment and the first embodiment is that step S100 in the first embodiment, namely the step of "preparing a rough carbon fiber composite shell blank," includes:

[0065] Step S110: Provide carbon fiber tow;

[0066] Step S120: Electroplating is performed on the carbon fiber bundle to deposit welding material on the surface of the carbon fiber bundle, thereby obtaining the carbon fiber bundle to be formed.

[0067] Step S130: The carbon fiber bundle to be formed is shaped to obtain a carbon fiber composite shell blank.

[0068] In this embodiment, before configuring the carbon fiber tow into carbon fiber prepreg, the carbon fiber tow undergoes electroplating to coat its surface with a welding material. This welding material can be a low-melting-point metal, either a single metal such as tin, lead, or zinc, or a mixture of multiple metals such as tin-based, lead-based, zinc-based, aluminum-based, silver-based, copper-based, or nickel-based brazing fillers. Next, the carbon fiber tow coated with the welding material, i.e., the carbon fiber tow to be formed, is also made into unidirectional fabric or woven fabric, then into prepreg, and undergoes a forming process (e.g., hot pressing) to obtain a carbon fiber composite shell blank.

[0069] At this point, removing the resin from the welding area reveals the carbon fiber bundles coated with welding material underneath. These bundles can be in the form of unidirectional fabric or woven fabric; that is, in this embodiment, the welding surface is formed by arranging or weaving several carbon fiber bundles coated with welding material. Because of the presence of the welding material on the welding surface, welding to the metal insert can be completed under high-temperature conditions, achieving the connection between the metal insert and the carbon fiber.

[0070] Understandably, in this embodiment, the welding material on the electroplated surface bonds well with the carbon fiber and is evenly distributed within the carbon fiber layer. Thus, during the later stages of fabricating the carbon fiber composite shell blank and removing the surface resin, the welding material is less likely to detach, resulting in excellent stability of the welded metal insert and increased reliability of the finished product.

[0071] like Figure 3 The image shown is a third embodiment of the method for preparing the carbon fiber composite shell of the present invention. The difference between this embodiment and the first embodiment is that step S100 in the first embodiment, namely the step of "preparing a rough carbon fiber composite shell blank," includes:

[0072] Step S110': Provide carbon fiber tow and welding material tow;

[0073] Step S120': Combine the carbon fiber bundles and the welding material bundles together to obtain a carbon fiber composite material layer;

[0074] Step S130': The carbon fiber composite material layer is formed to obtain a carbon fiber composite material shell blank.

[0075] In this embodiment, before configuring the carbon fiber tow into a carbon fiber prepreg and before configuring the carbon fiber tow into a unidirectional fabric or woven fabric, welding material tow is added to the carbon fiber tow. This involves weaving the carbon fiber tow and welding material tow together to obtain a carbon fiber composite material layer. Specifically, the welding material tow can be tow of metal materials with low melting points, such as tin wire, lead wire, or zinc wire. Next, the carbon fiber composite material layer with the woven welding material tow needs to be made into a prepreg and subjected to a molding process (e.g., hot pressing) to obtain a carbon fiber composite material shell blank. Of course, besides weaving, other reasonable methods can be used to combine the carbon fiber tow and welding material tow, such as alternating arrangements of the carbon fiber tow and welding material tow and co-prepreg to create a unidirectional prepreg.

[0076] At this point, removing the resin from the welding area reveals the underlying carbon fiber composite material layer woven with welding material strands; that is, the welding surface in this embodiment is formed by the carbon fiber composite material layer woven with welding material strands. Because of the presence of welding material on the welding surface, welding to the metal insert can be completed under high-temperature conditions, achieving the connection between the metal insert and the carbon fiber.

[0077] Understandably, in this embodiment, the welding material is woven together with the carbon fiber bundles in the form of a woven fabric. This not only ensures a good bond between the welding material and the carbon fiber but also allows for a more uniform distribution of the welding material within the carbon fiber layer. Consequently, during the later stages of fabricating the carbon fiber composite shell blank and removing the surface resin, the welding material is less likely to detach, resulting in excellent stability of the welded metal insert and thus increasing the reliability of the finished product.

[0078] like Figure 4 The image shown is a fourth embodiment of the method for preparing the carbon fiber composite shell of the present invention. The difference between this embodiment and the first embodiment is that step S100 in the first embodiment, namely the step of "preparing a rough carbon fiber composite shell blank," includes:

[0079] Step S110” provides a carbon fiber layer and a welding material layer;

[0080] Step S120” involves laminating the carbon fiber layer and the welding material layer to obtain a carbon fiber composite material layer;

[0081] Step S130”, the carbon fiber composite material layer is shaped to obtain a carbon fiber composite material shell blank.

[0082] This embodiment is specifically divided into the following two scenarios:

[0083] (1) The welding material layer is used as the surface layer;

[0084] Thus, in the step of "laminating the carbon fiber layer and the welding material layer to obtain a carbon fiber composite material layer": when there is only one carbon fiber layer, the prepreg of this carbon fiber layer is used as the bottom layer, and then the prepreg of the welding material layer is laminated on top of it to obtain the carbon fiber composite material layer; when there are several (greater than or equal to 2) carbon fiber layers, the prepregs of several carbon fiber layers are sequentially laminated together as the bottom layer, and then the prepreg of the welding material layer is laminated on top of it to obtain the carbon fiber composite material layer. Next, the carbon fiber composite material layer can be molded to allow the resin in the carbon fiber composite material layer to cool and solidify, thereby obtaining a carbon fiber composite material shell blank.

[0085] At this point, removing the resin from the welding area exposes the underlying welding material layer; that is, the welding surface in this embodiment is formed by the welding material layer. Because of the presence of the welding material on the welding surface, welding to the metal insert can be completed under high-temperature conditions, thus achieving the connection between the metal insert and the carbon fiber.

[0086] (2) The welding material layer serves as the inner layer;

[0087] In this way, at least one carbon fiber layer is stacked on top of the welding material layer. At this time, the welding material layer and all the carbon fiber layers above it need to be in direct interlayer contact and used as a whole—to make prepreg and directly become carbon fiber composite material layer, so as to form a carbon fiber composite shell blank; or, to make prepreg and stack it on the prepreg of the carbon fiber layer below to become carbon fiber composite material layer, so as to form a carbon fiber composite shell blank.

[0088] At this point, removing the resin from the welding area exposes the underlying carbon fiber layer; that is, the welding surface in this embodiment is formed by the carbon fiber layer. Although there is no welding material directly present on the welding surface, under high-temperature conditions, the welding material layer in direct contact with the carbon fiber layer will melt and penetrate to the welding surface, welding it to the metal insert and achieving the connection between the metal insert and the carbon fiber. It can be understood that using the welding material layer and all the carbon fiber layers above it in direct interlayer contact as a whole is to prevent resin from entering the interlayer and hindering the penetration of molten welding material to the welding surface.

[0089] Furthermore, it should be noted that the welding material layer in this embodiment can be welding material sheet, such as tin foil, lead foil, zinc foil, etc.; it can also be welding material unidirectional material, such as unidirectional material obtained by arranging tin wire, unidirectional material obtained by arranging lead wire, unidirectional material obtained by arranging zinc wire, etc.; it can also be welding material braided material, such as braided material obtained by tin wire, braided material obtained by arranging lead wire, braided material obtained by arranging zinc wire, etc.

[0090] Understandably, in this embodiment, the material thickness of the welding area and other areas outside the welding area is increased, and the structural reinforcement is achieved.

[0091] Understandably, the second to fourth embodiments described above all illustrate how to obtain the welding surface required for welding metal inserts during the step of "preparing carbon fiber composite shell blank".

[0092] The following describes another method for obtaining the weld surface required for welded metal inserts—the weld surface is obtained in the step of "removing the resin from the weld area on the surface of the carbon fiber composite shell blank to expose the weld surface on the carbon fiber composite layer in the carbon fiber composite shell blank," as detailed below:

[0093] like Figure 5The image shown is a fifth embodiment of the method for preparing a carbon fiber composite shell according to the present invention. The difference between this embodiment and the first embodiment is that step S200 in the first embodiment, namely, "removing the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank," includes:

[0094] Step S210: Remove the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the underlying carbon fiber layer;

[0095] Step S220: Apply welding material to the exposed carbon fiber layer to form a welding surface.

[0096] At this point, the step of "preparing a carbon fiber composite shell blank" can be carried out according to the technical route of ordinary carbon fiber-prepreg-hot pressing. After removing the resin from the welding area on the surface of the carbon fiber composite shell blank, the underlying carbon fiber layer will be exposed. Further, welding material is attached to the exposed carbon fiber layer to form a welding surface. Thus, due to the presence of welding material on the welding surface, welding with the metal insert can be completed under high-temperature conditions, achieving the connection between the metal insert and the carbon fiber.

[0097] Furthermore, it should be noted that in this embodiment, the welding material can be attached to the carbon fiber layer in various ways, such as electroplating or deposition. If deposition is used, chemical deposition and physical deposition are both available options.

[0098] Understandably, in this embodiment, the welding surface is formed after the surface resin removal step. This can effectively reduce the possibility of damage to the welding material caused by the process of making the carbon fiber composite shell blank and the process of removing the surface resin. This allows the welding material to obtain a better surface condition and storage condition on the welding surface, thereby achieving a tighter weld with the metal insert, improving the stability of the metal insert, and improving the reliability of the product.

[0099] To address the technical problems mentioned in the background section, this invention also proposes a carbon fiber composite shell, which is prepared by the method described above. The specific implementation of this method is as described in the foregoing embodiments. Since this carbon fiber composite shell employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by all the technical solutions of all the foregoing embodiments, which will not be elaborated upon here.

[0100] To address the technical problems mentioned in the background section, the present invention also proposes an electronic device comprising a carbon fiber composite material shell as described above, the specific structure of which refers to the foregoing embodiments. Since this electronic device employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by all the technical solutions of all the foregoing embodiments, which will not be elaborated upon here.

[0101] Specifically, the electronic device can be a head-mounted device, specifically a VR device, an AR device, etc.; among which, the AR device can be AR glasses, and the outer shell of the AR glasses includes a lens frame and temples; that is, the lens frame can include the carbon fiber composite material outer shell as described above; the temples can include the carbon fiber composite material outer shell as described above; or both can include the carbon fiber composite material outer shell as described above.

[0102] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing a carbon fiber composite shell, characterized in that, Includes the following steps: Preparation of carbon fiber composite shell rough blank; Remove the resin from the welding area on the surface of the carbon fiber composite shell blank to expose the welding surface on the carbon fiber composite layer in the carbon fiber composite shell blank. Metal inserts are welded to the welding surface; The steps for preparing the carbon fiber composite shell blank include: Provides carbon fiber layers and welding material layers; The carbon fiber layer and the welding material layer are laminated to obtain a carbon fiber composite material layer, with the welding material layer serving as the inner layer. At this point, the welding material layer and all the carbon fiber layers above it need to be in direct interlayer contact and used as a whole. Under high temperature conditions, the welding material layer in direct contact with the carbon fiber layer will melt and penetrate to the welding surface to weld with the metal insert, thus achieving the connection between the metal insert and the carbon fiber. The carbon fiber composite material layer is molded to obtain a rough blank of carbon fiber composite shell.

2. The preparation method according to claim 1, characterized in that, The steps for preparing the carbon fiber composite shell blank include: Provide carbon fiber tow; Electroplating is performed on the carbon fiber bundles to coat the surface of the carbon fiber bundles with welding material, thereby obtaining the carbon fiber bundles to be formed. The carbon fiber to be formed is shaped to obtain a rough blank of carbon fiber composite shell.

3. The preparation method according to claim 1, characterized in that, The steps for preparing the carbon fiber composite shell blank include: Provides carbon fiber tow and welding material tow; Carbon fiber bundles and welding material bundles are combined together to obtain a carbon fiber composite material layer; The carbon fiber composite material layer is molded to obtain a rough blank of carbon fiber composite shell.

4. The preparation method according to claim 1, characterized in that, The welding material layer is a welding material sheet, a unidirectional welding material, or a woven welding material.

5. The preparation method according to claim 1, characterized in that, The step of removing resin from the welded area on the surface of the carbon fiber composite shell blank to expose the welded surface on the carbon fiber composite layer in the carbon fiber composite shell blank includes: Remove the resin from the welded areas on the surface of the carbon fiber composite shell blank to expose the underlying carbon fiber layer; Welding material is attached to the exposed carbon fiber layer to form a weld surface.

6. The preparation method according to claim 5, characterized in that, In the step of attaching welding material to the exposed carbon fiber layer to form a welding surface, the welding material is attached to the carbon fiber layer by electroplating or deposition.

7. The preparation method according to any one of claims 1 to 6, characterized in that, In the step of welding the metal insert to the welding surface, the metal insert is welded to the welding surface by laser welding, ultrasonic welding or hot-press welding.

8. The preparation method according to claim 7, characterized in that, When the metal insert is welded to the welding surface using laser welding, the laser welding weld points are distributed in an array or circumferentially, and / or the diameter of the laser welding weld points is within 0.3 mm.

9. A carbon fiber composite material shell, characterized in that, It is prepared by the method for preparing the carbon fiber composite shell as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, Includes the carbon fiber composite shell as described in claim 9.

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