Structure and function integrated composite material supporting plate, flexible screen assembly and foldable terminal

Abstract

The invention discloses a structure and function integrated composite material supporting plate, a flexible screen assembly and a foldable terminal. The supporting plate comprises a metal connecting piece, and a first heat dissipation supporting piece and a second heat dissipation supporting piece which are symmetrically arranged on the two sides of the metal connecting piece. The metal connecting piece comprises a bending part and a first connecting part; a plurality of through holes are formed in the first connecting part; the first connecting parts are symmetrically arranged on the two sides of the bent part, the thickness of the first connecting parts is smaller than that of the bent part, and the first connecting parts are outward protrusions located in the middle of the bent part; the first heat dissipation supporting piece and the second heat dissipation supporting piece are fiber resin composite pieces formed by stacking a plurality of heat dissipation supporting layers or fiber resin composite pieces formed by alternately stacking a plurality of heat dissipation supporting layers and supporting layers; the heat dissipation supporting layer is a mesophase pitch-based carbon fiber reinforced resin-based composite material layer; and a second connecting part matched with the first connecting part is formed on the heat dissipation supporting layer or the supporting layer in the middle of the first heat dissipation supporting piece and the second heat dissipation supporting piece.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible screens, and in particular relates to a composite material support plate with integrated structure and function, a flexible screen assembly and a foldable terminal. Background Art

[0002] With the rapid development of mobile, wearable and other electronic devices, the demand for thin, lightweight, foldable and other electronic devices is increasing. In order to meet the flatness and rigidity of the flexible screen of the electronic device, a support plate is usually set under the screen. When designing a flexible screen support plate, the existing conventional flexible screen support plate generally adopts metal and / or composite solutions. The advantage of the metal solution is that the prepared support plate has high strength, high hardness and high bending performance, but the weight of the metal is heavy; the advantage of the composite solution is that the prepared support plate is light and strong, but the bending performance is low and the processing difficulty is greater; in order to solve the heat dissipation problem in existing electronic devices, heat dissipation components need to be added to assist heat dissipation, but it will increase the weight and thickness.

[0003] How to make the support plate lightweight, highly foldable and improve heat dissipation performance is an important issue that current flexible screen design needs to face. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a composite material support plate, a flexible screen assembly and a foldable terminal with integrated structure and function, so as to reduce weight and optimize stress distribution to improve bending resistance, and at the same time realize rapid heat conduction through stacked heat dissipation support layers to improve the comprehensive performance of the support plate.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a composite material support plate with integrated structure and function, comprising a metal connector, a first heat dissipation support member and a second heat dissipation support member symmetrically arranged on both sides of the metal connector; the metal connector comprises a bending portion and a first connecting portion; a plurality of vertically arranged through holes are provided through the vertical center line of the first connecting portion; The first connecting portion is symmetrically arranged on both sides of the bending portion, the thickness of the first connecting portion is smaller than the thickness of the bending portion, and the first connecting portion is an outward protrusion located in the middle of the bending portion; The first heat dissipation support member and the second heat dissipation support member are fiber-resin composite members formed by stacking several layers of heat dissipation support layers, or fiber-resin composite members formed by alternately stacking several layers of heat dissipation support layers and support layers; the heat dissipation support layer is an intermediate phase asphalt-based carbon fiber reinforced resin-based composite material layer; the heat dissipation support layer or support layer located in the middle part of the first heat dissipation support member and the second heat dissipation support member forms a second connecting part matching the first connecting part.

[0006] In one embodiment, the support layer is a polyacrylonitrile-based carbon fiber reinforced resin-based composite material layer.

[0007] In one embodiment, the fibers in the heat dissipation support layer are one or more of continuous fibers and chopped fibers; the fiber content in each layer of the heat dissipation support layer is 20%-80%; and the resin in the heat dissipation support layer is a thermoplastic or thermosetting resin.

[0008] In one embodiment, a plurality of grooves are provided outside the through hole of the first connecting portion.

[0009] In one embodiment, the thickness of the first connecting portion is 1 / 10-9 / 10 of the thickness of the bending portion; the width of the first connecting portion is 1 / 10-9 / 10 of the width of the bending portion.

[0010] In one embodiment, the thickness of each heat dissipation support layer is 5%-90% of the bending portion, and the thickness of the fiber-resin composite is equal to the thickness of the bending portion.

[0011] In one embodiment, the metal connector further includes a reinforcing sheet located at the bottom of the bent portion; the reinforcing sheet has an overlapping area with the first heat dissipation support member and the second heat dissipation support member.

[0012] In one embodiment, the cross-section of the bent portion of the metal connector includes a rectangular portion and a plurality of symmetrically arranged outwardly protruding portions on the upper edge and the lower edge of the rectangular portion, and gaps are arranged between the outwardly protruding portions.

[0013] In one embodiment, the distance between the top end of the outwardly protruding portion of the upper edge and the bottom end of the outwardly protruding portion of the lower edge is equal to the vertical distance between the upper and lower surfaces of the composite material support plate; and the gap is 0.2 mm-0.5 mm.

[0014] In one embodiment, the rectangular portion is connected to the first connecting portion, and the rectangular portion and the first connecting portion have the same thickness.

[0015] In one embodiment, the cross section of the bent portion of the metal connector is a continuous waveform with convexities and concavities alternating.

[0016] In one embodiment, the protrusion is symmetrical with the depression, and the vertical distance between the highest point of the protrusion and the lowest point of the depression is equal to the vertical distance between the upper and lower surfaces of the composite material support plate; the distance between the highest points of two adjacent protrusions is equal, and the distance between the highest points of two adjacent protrusions is 0.2mm-0.5mm.

[0017] In one embodiment, the starting end and the ending end of the continuous waveform are respectively connected to the first connecting portions located on both sides of the bending portion.

[0018] The present invention also provides a flexible screen assembly, comprising a composite material support plate with integrated structure and function as described in any one of the above items and a heat conductor located between the composite material support plate with integrated structure and function and the heat-generating components of the electronic device.

[0019] In one embodiment, the heat conducting member is connected to a heat dissipation support layer in a composite material support plate with integrated structure and function.

[0020] The present invention also provides a foldable terminal, comprising any one of the flexible screen components described above.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a composite material support plate with integrated structure and function, which integrates a metal connector and a heat dissipation support member, wherein the metal connector includes a bending portion and a first connecting portion, wherein the first connecting portion is a thinner outwardly protruding portion located in the middle of the metal connector and has a through hole. The first connecting portion not only significantly reduces the amount of material used, thereby reducing the weight of the overall support plate, but also enhances the strength and stability of the connector through its unique shape. The outwardly protruding shape enables the first connecting portion to disperse stress more effectively while providing convenience for fixing and connecting, thereby improving the anti-bending ability of the structure. In addition, the provision of the through hole further facilitates the precise docking and fixing with the support plate, and the through hole is used to fix the metal connector, the first heat dissipation support member and the second heat dissipation support member, thereby meeting the complex requirements of the flexible screen support plate in foldable applications. The heat dissipation support member is composed of a heat dissipation support layer stacked or a heat dissipation support layer and a support layer alternately stacked, and its stacked layer structure not only improves the overall strength and rigidity of the support plate, but also enables rapid heat conduction, thereby improving the comprehensive performance of the support plate.

[0022] Furthermore, the design of the groove can increase the contact area between the metal connector and the surrounding heat dissipation support, which is beneficial to the conduction and dissipation of heat. When heat is conducted through the metal connector, the groove can serve as an additional heat dissipation channel to accelerate the dissipation of heat and improve the overall heat dissipation efficiency. The presence of the groove can reduce the amount of material used in the metal connector, thereby achieving lightweight support plates without affecting the overall strength and stability. Reasonable groove design can enhance the structural strength of the metal connector to a certain extent. The groove can serve as a stress dispersion point to reduce the risk of structural damage caused by concentrated stress.

[0023] Furthermore, the reinforcing sheet, as an additional structure of the metal connector, can effectively improve the bearing capacity and deformation resistance of the overall support plate. When subjected to external force, the reinforcing sheet can share part of the stress and prevent the connector from breaking or plastic deformation, thereby maintaining the stability and integrity of the support plate. When there is an overlapping area between the reinforcing sheet and the heat dissipation support, the conduction and dissipation of heat can be further promoted. The reinforcing sheet can quickly conduct heat from the inside of the support plate to the outside, improving the heat dissipation efficiency. The introduction of the reinforcing sheet can optimize the stress distribution inside the support plate. Under complex stress conditions, the reinforcing sheet can act as a stress dispersion point, reduce the occurrence of stress concentration, and reduce the risk of failure of the support plate due to stress concentration. In addition, the overlapping area design of the reinforcing sheet and the heat dissipation support can increase the contact area between them, thereby enhancing the reliability of the connection between them.

[0024] Furthermore, the bending portion with the outward protrusion not only increases the complexity and stability of the structure, but also directly reduces the weight because the gap part does not need to be filled with material. At the same time, the presence of the protrusion increases the rigidity of the cross section, so that the necessary structural strength is maintained while reducing the weight. The protrusion provides an additional bending radius or space, making bending easier without causing damage to the structure. During the folding process, metal connectors may be subjected to large bending stresses. By designing the outward protrusions and providing gaps between them, these stresses can be effectively dispersed, reducing the risk of stress concentration, thereby protecting the integrity and reliability of the connector during the folding process.

[0025] Furthermore, the continuous wave design achieves a lightweight structure by reducing unnecessary material accumulation. Compared to solid or uniform thickness designs, this wave structure reduces the amount of material used while maintaining strength. The wave design enables the structure to distribute stress more effectively when subjected to the same load, thereby allowing the use of less material to achieve the same strength requirements. The continuous wave design allows the bend to adapt to deformation more easily when bending, reducing the risk of stress concentration and fracture. This design improves the foldability and durability of the support plate. The raised and recessed parts in the wave structure can offset some of the stress of each other when bending, thereby reducing the stress level of the overall structure. This stress dispersion effect helps protect the support plate from damage during the folding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A top view of a composite material support plate provided by one embodiment of the present invention; Figure 2 A cross-sectional view of a composite material support plate provided by one embodiment of the present invention; Figure 3 A cross-sectional view of a composite material support plate provided by one embodiment of the present invention; Figure 4 A top view of a composite material support plate provided by another embodiment of the present invention; Figure 5 A cross-sectional view of a composite material support plate provided by another embodiment of the present invention; Figure 6 A cross-sectional view of a composite material support plate provided by another embodiment of the present invention; Figure 7 A cross-sectional view of a composite material support plate provided by one embodiment of the present invention; Figure 8 A top view of a composite material support plate provided in yet another embodiment of the present invention; Fig. 9 A cross-sectional view of a composite material support plate provided in yet another embodiment of the present invention; Fig.10 A cross-sectional view of a composite material support plate provided in yet another embodiment of the present invention; Fig.11 A top view of a composite material support plate provided by one embodiment of the present invention; Fig.12 A cross-sectional view of a composite material support plate provided by one embodiment of the present invention; Fig.13 A cross-sectional view of a composite material support plate provided in accordance with an embodiment of the present invention.

[0027] Among them: 1-metal connecting part; 11-bending part; 12-first connecting part; 121-through hole; 122-groove; 123-reinforcement sheet; 124-rectangular part; 125-outward protruding part; 126-continuous waveform; 127-protrusion; 128-recess; 2-first heat dissipation support member; 3-second heat dissipation support member; 21-heat dissipation support layer; 22-support layer. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The present application is further described in detail below with reference to the accompanying drawings: See also Figure 1 , 2 and 3, the present application provides a composite material support plate with integrated structure and function, which includes a metal connector 1 and a first heat dissipation support member 2 and a second heat dissipation support member 3 located on both sides of the metal connector 1. The metal connector 1 includes a bending portion 11 and a first connecting portion 12. The first connecting portion 12 is penetrated by a plurality of vertically arranged through holes 121 on the vertical center line, which are used to connect the metal connector 1, the first heat dissipation support member 2 and the second heat dissipation support member 3. The first connecting portion 12 is symmetrically arranged on both sides of the bending portion 11, and its thickness is less than the bending portion 11, and it is an outward protruding structure in the middle of the bending portion 11. The heat dissipation support includes a first heat dissipation support member 2 and a second heat dissipation support member 3, both of which are fiber-resin composites, and the first heat dissipation support member 2 and the second heat dissipation support member 3 are completely consistent.

[0031] The first heat dissipation support member 2 and the second heat dissipation support member 3 are formed by stacking multiple heat dissipation support layers 21, or by alternately stacking heat dissipation support layers 21 and support layers 22. The first heat dissipation support member 2 and the second heat dissipation support member 3 are symmetrically arranged on both sides of the metal connector, and a second connection portion matching the first connection portion 12 is formed at the corresponding middle position of the first heat dissipation support member 2 and the second heat dissipation support member 3 to achieve a stable connection.

[0032] Preferably, the heat dissipation support layer 21 is a mesophase asphalt-based carbon fiber reinforced resin-based composite material layer, which has good thermal conductivity. The support layer 22 is a polyacrylonitrile-based carbon fiber reinforced resin-based composite material layer, which can provide strong support.

[0033] The heat dissipation support layer 21 is a composite material layer made of a mesophase pitch-based carbon fiber reinforced resin-based composite material, wherein the mesophase pitch-based carbon fiber material has a high thermal conductivity. The heat dissipation support layer 21 has excellent heat dissipation performance, can quickly disperse and conduct heat, and effectively prevent local overheating. At the same time, its light weight, high strength, and high modulus characteristics also reduce the overall weight of the support plate and improve the use efficiency.

[0034] Compared with the mainstream polyacrylonitrile-based carbon fibers in the market, the mesophase asphalt-based carbon fibers used in the heat dissipation support layer 21 not only have the performance of light weight and high strength, but also have ultra-high modulus and high thermal conductivity. As the reinforcing phase of the composite material support plate, the mesophase asphalt-based carbon fibers, on the one hand, utilize the high modulus characteristics of the material to improve the rigidity of the support plate, thereby reducing the thickness of the support plate and achieving lightweight support plate; on the other hand, the high thermal conductivity of the material is utilized to make the support plate have the function of heat distribution and heat dissipation. Through design, it can replace the heat dissipation layer of the original heat-generating components in the electronic equipment, realize the heat dissipation function of the support plate, and promote the lightweight and thinness of the electronic equipment.

[0035] The heat dissipation support layer 21 in the embodiment of the present application is a prepreg, prepreg tape or prepreg board made of unidirectional or multi-directional angle woven fabric. The fibers in the heat dissipation support layer 21 are one or more of continuous fibers and chopped fibers; the resin in the heat dissipation support layer 21 is a thermoplastic or thermosetting resin. The length of the chopped fibers is 0.1mm-50mm, and the lengths of the chopped fibers are equal or unequal. The fibers and resin in the support layer 22 polyacrylonitrile-based carbon fiber reinforced resin-based composite material layer are the same as above. The metal connector 1 is a metal part made of any one of titanium, aluminum, copper, iron, titanium alloy, aluminum alloy, copper alloy and iron alloy.

[0036] The fiber content of each layer of the heat dissipation support layer 21 and the support layer 22 is 20%-80%. When the fiber content is low (such as 20%-30%), it is mainly composed of matrix materials (such as resin). As the fiber content increases (such as 30%-50%), the proportion of fiber in the layer gradually increases, forming a denser fiber network. When the fiber content reaches a higher level (such as 50%-80%), the layer is almost entirely composed of fiber and a small amount of matrix material. This high fiber content structure has extremely high strength and stiffness while maintaining a low weight, which is an effective way to achieve lightweight design.

[0037] Among them, the chopped fibers are ensured to be evenly dispersed in the matrix material through appropriate process control, and the processing process is relatively simple. They can be directly mixed with the matrix material and processed into the required shape and size, thereby achieving the isotropy of the overall performance of the heat dissipation support layer 21 and the support layer 22.

[0038] In the embodiment of the present application, the metal retention rate of the first connecting portion 12 after the through hole 121 is opened is 5%-95%, which can further reduce the weight. During the hot pressing molding process when processing and manufacturing the composite material support plate, the remaining resin in the prepreg fills the through hole 121 for further bonding.

[0039] The first support member 2, the metal connector 1 and the second support member 3 are combined by thermal compression, gluing or embedding, or a combination of the above methods.

[0040] In a specific embodiment, the thickness and width of the first connecting portion 12 are 1 / 10-9 / 10 of the thickness and width of the bending portion 11. The thickness of each heat dissipation support layer 21 is 5%-90% of the bending portion 11, and the thickness of the fiber resin composite formed by the heat dissipation support layer 21 is equal to the thickness of the bending portion 11.

[0041] The composite material reinforcement phase of the heat dissipation support layer 21 used in this application is specifically sourced from the ultra-high modulus asphalt-based carbon fiber (brands TC-HM-60, TC-HM-70, TC-HM-80) and high thermal conductivity asphalt-based carbon fiber (brands TC-HC-500, TC-HC-600, TC-HC-800) of Shaanxi Tiance New Materials Technology Co., Ltd., with a thermal conductivity of up to 800W / (m·K), a modulus of up to 900GPa, and a strength of 2400MPa, which not only maintains a relatively high strength, but also has a relatively high modulus and thermal conductivity.

[0042] This application uses an intermediate phase asphalt-based carbon fiber with high modulus and high thermal conductivity as the reinforcing phase of the composite material support plate, and at the same time, a metal connector 1 having a first connecting part 12 is combined with the composite material to achieve lightweight, thin and foldable properties while meeting the flatness and stiffness requirements of the support plate, while increasing the heat distribution and heat dissipation functions, providing a new idea for weight reduction of electronic equipment.

[0043] In another embodiment of the present application, Figure 4 , 5 As shown in FIG. 6 , a plurality of grooves 122 are provided outside the through hole 121 of the first connecting portion 12 .

[0044] The groove 122 is a circular or elliptical groove, a rectangular or square groove, a polygonal groove (such as a triangle, a hexagon, etc.), an irregular groove, a conical or wedge-shaped groove, or a groove with chamfered or rounded corners.

[0045] The design of the groove 122 can fit more closely with the second connecting part in the first heat dissipation support member 2 and the second heat dissipation support member 3, forming a more stable mechanical locking structure. When this locking structure is subjected to external forces, it can more effectively disperse stress, prevent loosening or breakage at the connection part, thereby enhancing the connection strength and stability of the entire support plate. The opening of the groove 122 can reduce the material usage of the metal connector without sacrificing the connection strength and stability. The opening of the groove 122 can not only increase the contact area between the metal connector 1 and the heat dissipation support member, but also facilitate heat conduction and diffusion. When the electronic components outside the support plate generate heat during operation, the groove 122 can serve as a heat conduction channel, helping the heat to be transferred from the heat source to the heat dissipation support member more quickly and dissipating the heat through the excellent heat dissipation performance of the heat dissipation support member.

[0046] In an embodiment of the present application, as Figure 7 shown, a reinforcing piece 123 is added at the bottom of the bent portion 11 of the metal connector 1. The reinforcing piece 123 and the bent portion 11 are integrated, and the shape is in the shape of the Chinese character "tu". The reinforcing piece 123 has overlapping regions with both the first heat dissipation support member 2 and the second heat dissipation support member 3. The overlapping regions are partially overlapping or fully overlapping.

[0047] As an additional support structure, the reinforcing piece 123 can significantly improve the overall strength and stiffness of the metal connector 1, especially in the stress concentration area of the bent portion. This helps to resist external loads and vibrations and extend the service life of the support plate. Since the reinforcing piece 123 has overlapping regions with the first heat dissipation support member 2 and the second heat dissipation support member 3, this design not only enhances the connection strength between the metal connector 1 and the heat dissipation support member, but also improves the overall stability of the entire support plate by increasing the contact area and dispersing stress. The introduction of the reinforcing piece 123 helps to optimize the stress distribution inside the support plate, reduce the risk of local damage caused by stress concentration, and protect other components from damage.

[0048] In another embodiment of the present application, as Figure 8 、 9 and 10 shown, the cross-sectional main body of the bent portion 11 of the metal connector 1 is a rectangular portion 124. On the upper edge and the lower edge of the rectangular portion 124, a number of outwardly protruding portions 125 are symmetrically arranged, and there are gaps between the outwardly protruding portions 125.

[0049] The range of the gaps is 0.2 mm - 0.5 mm. To prevent small components from falling in, it should not exceed this gap range.

[0050] As Fig.10As shown, the rectangular portion 124 in the bent portion 11 is connected and flush with the first connecting portion 12, and has the same thickness. More specifically, the distance between the top end of the outwardly protruding portion 125 of the upper edge and the bottom end of the outwardly protruding portion 125 of the lower edge is equal to the vertical distance between the upper and lower surfaces of the composite material support plate.

[0051] More specifically, the shape of the outwardly protruding portion 125 is circular or elliptical, rectangular or square, polygonal (such as triangle, hexagon, etc.), irregular, conical or wedge-shaped, or a shape with chamfered or rounded corners.

[0052] By designing a bending portion 11 with an outward protruding portion 125, the continuous use area of ​​the material can be reduced without significantly reducing the overall structural strength, thereby reducing the weight of the entire support plate. The outward protruding portion 125 can be used as a reinforcing rib to increase the rigidity and strength of the structure, especially in the bending and force directions. This design can improve the bending and deformation resistance of the support plate while maintaining lightweight. Providing an outward protruding portion 125 on the bending portion 11 can more effectively disperse and absorb the stress generated during bending, which helps to reduce stress concentration and improve the durability and reliability of the support plate, especially in frequent bending usage scenarios. The gap between the outward protruding portions 125 can be used as a buffer area during folding, reducing friction and resistance during the folding process and improving the foldability of the support plate.

[0053] In one embodiment of the present application, Fig.11 , 12 As shown in FIG. 13 , the bending portion 11 of the metal connector 1 presents a continuous waveform 126 in cross section, and the continuous waveform 126 is composed of alternating protrusions 127 and depressions 128. The continuous waveform 126 is similar to a sine or cosine waveform, and the protrusions 127 and depressions 128 are symmetrical about the center line of the bending portion.

[0054] like Fig.13 As shown, the starting end and the ending end of the continuous waveform 126 are respectively connected to the first connecting parts 12 located on both sides of the bending part 11. More specifically, the distance between the highest points of two adjacent protrusions 127 is equal and is 0.2mm-0.5mm. In order to prevent small components from falling in, the distance range cannot be exceeded. The vertical distance between the highest point of the protrusion 127 and the lowest point of the depression 128 is equal to the vertical distance between the upper and lower surfaces of the composite material support plate.

[0055] The corrugated structure can increase the overall rigidity of the metal structure and improve its ability to resist deformation. By removing part of the material to form a continuous corrugated 126 structure, the weight of the metal parts can be reduced while maintaining or improving performance. By adopting a corrugated design, the continuous use area of ​​the material can be reduced while maintaining a certain structural strength, thereby reducing the overall weight of the support plate. The alternating arrangement of protrusions 127 and depressions 128 can make the folding line smoother, reduce friction and resistance during folding, and improve the smoothness and reliability of folding. During repeated folding, the corrugated design helps to disperse stress and reduce the occurrence of stress concentration. This helps to improve the durability and fatigue resistance of the support plate in the folding area and extend the service life of the flexible screen device.

[0056] In a specific implementation process, the length of the metal connector 1 is 20mm-500mm, the width is 1mm-100mm, and the thickness is 0.08mm-1mm. The connection area of ​​the metal connector 1 is designed with an ear-hanging structure, namely the first connection part 12, whose thickness and width are 1 / 10-9 / 10 of the overall thickness and width of the metal connector 1, and is located in the middle of the overall thickness and width direction of the metal connector 1. In addition, a through hole 121 is provided on the first connection part 12, and the shape of the through hole 121 is preferably circular, and a groove 122 is provided in the non-opening area.

[0057] The thickness of the metal connector 1, the first heat dissipation support 2 and the second heat dissipation support 3 are consistent, and the number can be set in several pieces according to the requirements of the folding area. Taking three folds as an example, the first heat dissipation support 2 and the second heat dissipation support 3 are set on both sides of a metal connector 1, and another metal connector 1 and the first heat dissipation support 2 are set on the other side of the second heat dissipation support 3.

[0058] In this specific embodiment, taking odd-numbered layers as an example, the middle layer of heat dissipation support layer 21 and support layer 22 are based, and the upper and lower layers are symmetrically distributed. The material, thickness, resin content and laying direction of the symmetrical layers are consistent, forming the same first heat dissipation support member 2 and second heat dissipation support member 3.

[0059] In this specific embodiment, a method for manufacturing a composite material support plate with integrated structure and function is also provided, comprising the following steps: Step 1: Prepare metal connector 1: By mechanical processing and laser processing, two groups of first connecting parts 12 with a length of 160 mm, a width of 8 mm and a thickness of 0.07 mm and a bending part 11 with a length of 160 mm, a width of 14 mm and a thickness of 0.15 mm are processed from a titanium alloy connecting piece with a length of 160 mm, a width of 30 mm and a thickness of 0.15 mm. The first connecting part 12 is located at the two long side edges of the bending part 11 of the titanium alloy connecting piece, centered along the thickness direction, and a Φ4 mm circular opening is performed on the first connecting part 12 to form a first connecting part 12 with a through hole 121. The metal connecting piece 1 consists of a bending part 11 and the first connecting parts 12 with thinner sides on both sides of the bending part 11; chemical etching is used to roughen the upper and lower surfaces and the side surfaces of the first connecting part 11, i.e., the bonding surface of the connecting area.

[0060] Step 2: Prepare a resin-based composite support preform, a heat dissipation support layer 21 and a support layer 22: Four single-layer prepreg sheets with a length of 160 mm, a width of 70 mm, a thickness of 0.04 mm and a fiber content of 60% were prepared by compounding high-strength polyacrylonitrile-based carbon fiber continuous fibers (brand name T700) and epoxy resin as support layers 22. Two single-layer prepreg sheets with a length of 160 mm, a width of 70 mm, a thickness of 0.07 mm and a fiber content of 60% were prepared by compounding high-modulus mesophase asphalt-based carbon fiber continuous fibers (brand name TC-HM-70) and epoxy resin as heat dissipation support layers 21. The edge of the heat dissipation support layer 21 in the middle was processed according to the shape and size matching the first connection part 12 in the metal connector 1 to form a second connection part matching the first connection part 12.

[0061] Step 3: Hot Pressing: The above two support layers 22 are distributed on both sides of the bending portion 11 below the first connection portion 12 of the above titanium alloy connector, and the fiber direction is laid on the bottom layer at 0 degrees; the above two heat dissipation support layers 21 are distributed on both sides of the first connection portion of the above titanium alloy connector, and the fiber direction is at 90 degrees. The second connection portion is processed at the edge position, and the second connection portion is embedded with the bonding area of ​​the titanium alloy connector, that is, the first connection portion 12, and laid on the middle layer; the above two support layers 22 are distributed on both sides of the bending portion 11 above the first connection portion 12 of the above titanium alloy connector, and the fiber direction is laid on the top layer at 0 degrees to form the first heat dissipation support member 2 and the second heat dissipation support member 3. The metal connector 1, the first heat dissipation support member 2 and the second heat dissipation support member 3 are formed by hot pressing to form a composite material support plate blank combining metal and resin-based composite materials. During the hot pressing process, the excess resin in the prepreg fills the through hole 121 for further bonding.

[0062] Step 4: Surface Preparation: The support plate blank is subjected to mechanical processing to remove burrs, glue overflow, oxide layer and processing allowance on the surface and edge of the blank, so as to achieve a smooth surface and an external dimension that meets the design requirements, thereby forming a composite material support plate with integrated structure and function.

[0063] On the basis of the above manufacturing method, the processing method in preparing the metal connector 1 is not limited to mechanical processing and laser processing, but also includes chemical etching, plasma etching and other processing methods. The processing method of surface treatment is not limited to mechanical processing, but also includes laser processing, chemical etching, plasma etching and other processing methods.

[0064] On the basis of the above manufacturing method, the step of preparing the metal connector 1 also includes the step of forming a groove 122 in the non-opening area. The shape of the groove 122 is not limited, such as Figure 5 As shown, the size of the groove 122 can be equal to the width and thickness of the first connecting portion 12, that is, it can penetrate the first connecting portion 12, or the metal material can be completely removed along the edge to form a groove 122 tangent to the bending portion 11. The shape of the corresponding second connecting portion in the corresponding area of ​​the corresponding first heat dissipation support member 2 and the second heat dissipation support member 3 matches the shape of the first connecting portion 12 having the groove 122.

[0065] In another case, if Figure 7 As shown, in the step of preparing the metal connector 1, there is an integrated reinforcing sheet 123 at the bottom of the bending portion 11, and there are overlapping areas between the reinforcing sheet 123 and the first heat dissipation support member 2 and the second heat dissipation support member 3. The size of the overlapping area is not limited, and the overlapping area can be complete or partial.

[0066] In another case, if Fig. 9 As shown, in the step of preparing the metal connector 1, the main part of the bending portion 11 is rectangular, and a plurality of outward protruding parts 125 are processed at the upper and lower edges thereof.

[0067] In one case, if Fig.12 As shown, in the step of preparing the metal connector 1, the shape of the bending portion 11 is a continuous waveform 126, and the protrusions 127 and recesses 128 of the continuous waveform 126 alternate in sequence. The highest point of a protrusion 127 is flush with the topmost support layer 22 or the heat dissipation support layer 21, and the lowest point of the adjacent recess 128 is flush with the bottommost support layer 22 or the heat dissipation support layer 21.

[0068] The first heat dissipation support member 2 and the second heat dissipation support member 3 can be composed of a simple plurality of heat dissipation support layers 21, or can be a fiber resin composite composed of a support layer 22-heat dissipation support layer 21-support layer 22 as described above, or can be a heat dissipation support layer 21-support layer 22-heat dissipation support layer 21, and the specific stacking method is not limited. In the above case, when the fibers in the heat dissipation support layer 21 and the support layer 22 are short-cut fibers, the laying direction is not limited, and when the fibers in the heat dissipation support layer 21 and the support layer 22 are continuous fibers, the layers are laid and stacked according to the mechanical design layup.

[0069] The composite material support plate with the above-mentioned integrated structure and function is combined with a heat conductor to form a flexible screen assembly. The heat conductor is placed between the heat-generating components of the electronic device and the composite material support plate. The first heat dissipation support member 2 and the second heat dissipation support member 3 in the composite material support plate are composed of a multi-layer heat dissipation support layer 21 (such as an intermediate phase asphalt-based carbon fiber reinforced resin-based composite material layer). The heat dissipation support layer 21 has excellent thermal conductivity and can quickly conduct the heat generated by the heat-generating components of the electronic device. The addition of the heat conductor further enhances the heat dissipation effect, ensuring that the heat can be efficiently transferred from the heat-generating components to the composite material support plate, and dissipated into the air through the heat dissipation support layer 21, thereby protecting the electronic equipment and the flexible screen from high temperature damage.

[0070] Furthermore, the heat conducting member should be connected to the heat dissipation support layer 21 in the composite material support plate, and the heat conducting member is preferably a graphite layer or a copper foil.

[0071] When the flexible screen assembly is applied to a foldable terminal, the efficient heat dissipation component (heat dissipation support layer 21) in the flexible screen assembly can quickly dissipate the heat generated by the heat generating components and maintain a suitable temperature inside the terminal. This is of great significance for improving the performance stability of the terminal and extending the battery life.

[0072] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A composite material support plate with integrated structure and function, characterized in that: It comprises a metal connecting piece (1), a first heat dissipation support piece (2) and a second heat dissipation support piece (3) symmetrically arranged on both sides of the metal connecting piece (1); the metal connecting piece (1) comprises a bending portion (11) and a first connecting portion (12); a plurality of vertically arranged through holes (121) are provided on the vertical center line of the first connecting portion (12); The first connecting portion (12) is symmetrically arranged on both sides of the bent portion (11); the thickness of the first connecting portion (12) is smaller than the thickness of the bent portion (11); and the first connecting portion (12) is an outward protrusion located in the middle of the bent portion (11); The first heat dissipation support member (2) and the second heat dissipation support member (3) are fiber-resin composite members formed by stacking a plurality of heat dissipation support layers (21), or fiber-resin composite members formed by alternately stacking a plurality of heat dissipation support layers (21) and support layers (22); the heat dissipation support layer (21) is a mesophase asphalt-based carbon fiber reinforced resin-based composite material layer; the heat dissipation support layer (21) or the support layer (22) located in the middle of the first heat dissipation support member (2) and the second heat dissipation support member (3) forms a second connection portion that matches the first connection portion (12).

2. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The support layer (22) is a polyacrylonitrile-based carbon fiber reinforced resin-based composite material layer.

3. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The fibers in the heat dissipation support layer (21) are one or more of continuous fibers and chopped fibers; the fiber content in each layer of the heat dissipation support layer (21) is 20%-80%; and the resin in the heat dissipation support layer (21) is a thermoplastic or thermosetting resin.

4. The composite material support plate with integrated structure and function according to claim 1, characterized in that: A plurality of grooves (122) are provided outside the position of the through hole (121) of the first connecting portion (12).

5. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The thickness of the first connecting portion (12) is 1 / 10 to 9 / 10 of the thickness of the bending portion (11); and the width of the first connecting portion (12) is 1 / 10 to 9 / 10 of the width of the bending portion (11).

6. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The thickness of each heat dissipation support layer (21) is 5%-90% of the thickness of the bent portion (11), and the thickness of the fiber-resin composite part is equal to the thickness of the bent portion (11).

7. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The metal connecting piece (1) further comprises a reinforcing sheet (123) located at the bottom of the bent portion (11); the reinforcing sheet (123) has an overlapping area with the first heat dissipation support piece (2) and the second heat dissipation support piece (3).

8. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The cross section of the bent portion (11) of the metal connector (1) comprises a rectangular portion (124) and a plurality of symmetrically arranged outwardly protruding portions (125) on the upper edge and the lower edge of the rectangular portion (124), with gaps being arranged between the outwardly protruding portions (125).

9. The composite material support plate with integrated structure and function according to claim 8, characterized in that: The distance between the top end of the outwardly protruding portion (125) of the upper edge and the bottom end of the outwardly protruding portion (125) of the lower edge is equal to the vertical distance between the upper and lower surfaces of the composite material support plate; and the gap is 0.2 mm-0.5 mm.

10. The composite material support plate with integrated structure and function according to claim 8, characterized in that: The rectangular portion (124) is connected to the first connecting portion (12), and the rectangular portion (124) and the first connecting portion (12) have the same thickness.

11. The composite material support plate with integrated structure and function according to claim 1, characterized in that: The cross section of the bent portion (11) of the metal connector (1) is a continuous waveform (126) with convexities (127) and concavities (128) alternating between them.

12. The composite material support plate with integrated structure and function according to claim 11, characterized in that: The protrusion (127) is symmetrical to the depression (128); the vertical distance between the highest point of the protrusion (127) and the lowest point of the depression (128) is equal to the vertical distance between the upper and lower surfaces of the composite material support plate; the distance between the highest points of two adjacent protrusions (127) is equal, and the distance between the highest points of two adjacent protrusions (127) is 0.2 mm-0.5 mm.

13. The composite material support plate with integrated structure and function according to claim 11, characterized in that: The starting end and the ending end of the continuous waveform (126) are respectively connected to the first connecting portions (12) located on both sides of the bending portion (11).

14. A flexible screen assembly, characterized in that: It comprises the composite material support plate with integrated structure and function as claimed in any one of claims 1 to 13 and a heat conducting member located between the composite material support plate with integrated structure and function and the heat generating components of the electronic equipment.

15. The flexible screen assembly according to claim 14, characterized in that: The heat conducting element is connected to a heat dissipation support layer (21) in a composite material support plate with integrated structure and function.

16. A foldable terminal, characterized in that: The foldable terminal comprises the flexible screen assembly as claimed in any one of claims 14 and 15.

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