Liquid absorption core, vapor chamber and foldable electronic equipment

Abstract

The invention provides a liquid absorption core, a vapor chamber and foldable electronic equipment, relates to the technical field of heat dissipation, and aims to enhance the bending resistance of the liquid absorption core. The liquid absorbing core comprises a plurality of first weaving wires and a plurality of second weaving wires, the first weaving wires extend in the first direction, the second weaving wires extend in the second direction, the first weaving wires and the second weaving wires are interwoven to form a net, and the first direction intersects with the second direction. At least one of the first weaving filaments and the second weaving filaments comprises a spiral line.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, and in particular to a liquid absorber, a heat spreader, and a foldable electronic device. Background Technology

[0002] Because the liquid wick inside the heat spreader has poor bending resistance, its lifespan is greatly reduced, making heat dissipation a problem that urgently needs to be solved in foldable electronic devices. Summary of the Invention

[0003] This application proposes a liquid absorbent core, a heat spreader, and a foldable electronic device, aiming to enhance the bending resistance of the liquid absorbent core.

[0004] To achieve the above objectives, embodiments of this application provide the following technical solutions:

[0005] On one hand, a liquid-absorbing core is provided, comprising a plurality of first braided filaments and a plurality of second braided filaments, wherein the first braided filaments extend along a first direction and the second braided filaments extend along a second direction, the plurality of first braided filaments and the plurality of second braided filaments interweaving to form a web, the first direction and the second direction intersecting. At least one of the first braided filaments and the second braided filaments includes a helix.

[0006] The liquid-absorbing core provided in the embodiments of this application is composed of a first braided filament and a second braided filament interwoven into a mesh, and at least one of the first braided filament and the second braided filament includes a spiral. This liquid-absorbing core can be applied to a flexible heat exchanger. The mesh-like liquid-absorbing core has a capillary effect, which can guide the flow of liquid working fluid, promote the evaporation and heat absorption of liquid working fluid and the condensation and heat release of gaseous working fluid, and realize rapid and uniform heat exchange inside the heat exchanger.

[0007] Compared to traditional mesh absorbent cores where the braided filaments are straight, which are prone to stress concentration and breakage during bending, the absorbent core of this application has spring-like spiral braids. This makes it less prone to stress concentration during bending, giving the absorbent core stronger bending resistance and making it less likely to break. This effectively extends the service life of the absorbent core and the flexible heat spreader mounted on it.

[0008] In some embodiments, at least one of the first braided filament and the second braided filament includes two spirals, which are wound together to form a double helix structure.

[0009] In some embodiments, the absorbent core further includes a plurality of connecting keys, and the two spirals are connected by the plurality of connecting keys to form a plurality of through holes between the two spirals.

[0010] In some embodiments, the absorbent core further includes a coating disposed on the surface of the spiral and within a plurality of through holes.

[0011] In some embodiments, the coating material includes a hydrophilic material or a hydrophobic material.

[0012] In some embodiments, the first braiding filament includes two spirals wound together to form a double helix structure, and the second braiding filament includes one spiral.

[0013] In some embodiments, one spiral of the second braided filament interweaves with the first braided filament at the intersection of the two spirals of the first braided filament to form a web.

[0014] In some embodiments, the materials of the first braided wire and the second braided wire both include at least one of copper, aluminum, iron, and stainless steel.

[0015] In some embodiments, the thickness of the absorbent core ranges from 100 μm to 500 μm.

[0016] On the other hand, a heat spreader is provided, which includes an upper shell and a lower shell, a plurality of support columns, and a liquid-absorbing core as described in any of the above embodiments. The upper shell and the lower shell are connected to form a cavity, the plurality of support columns are disposed within the cavity and located between the upper shell and the lower shell, and the liquid-absorbing core is disposed within the cavity.

[0017] The heat spreader provided in this application embodiment is flexible and can be applied to foldable electronic devices. Its cavity includes the liquid absorber core as described in the above embodiment. Since the bending resistance of the liquid absorber core is significantly improved, the liquid absorber core is not easy to break and fail, which improves the problem of liquid working fluid interruption and blockage caused by the breakage of the liquid absorber core. As a result, the bending resistance and service life of the heat spreader are also effectively improved.

[0018] In some embodiments, the heat spreader includes a multilayer liquid-absorbing core, which includes at least one first liquid-absorbing core and at least one second liquid-absorbing core. The cavity includes an evaporation end near the lower housing and a condensation end near the upper housing. At least one first liquid-absorbing core is disposed between a plurality of support pillars and the lower housing, and at least one second liquid-absorbing core is disposed between the plurality of support pillars and the upper housing. The surface of the first liquid-absorbing core is provided with a coating comprising a hydrophobic material, and the surface of the second liquid-absorbing core is provided with a coating comprising a hydrophilic material.

[0019] In some embodiments, the first absorbent core is connected to the second absorbent core.

[0020] In some embodiments, at least one absorbent core is disposed between the plurality of support pillars and the lower housing, or between the plurality of support pillars and the upper housing, or between the plurality of support pillars and the lower housing and the plurality of support pillars and the upper housing. Along the plane of the heat spreader, the cavity includes an evaporating end and a condensing end opposite to each other. The absorbent core includes a first end near the evaporating end and a second end near the condensing end. The surface of the first end is provided with a coating including a hydrophobic material, and the surface of the second end is provided with a coating including a hydrophilic material.

[0021] In some embodiments, both the upper and lower housings include a flexible substrate and a metal film, with the metal film disposed on the side of the flexible substrate away from the cavity.

[0022] In another aspect, a foldable electronic device is provided, which includes a heat spreader and electronic components as described in any of the above embodiments, wherein the cavity of the heat spreader includes an evaporation end and a condensation end, and the evaporation end of the heat spreader is disposed close to the electronic components.

[0023] Since the liquid absorption core in the heat spreader provided in this application embodiment includes a spiral, the spiral improves the bending resistance of the liquid absorption core, achieving good flexibility and a longer service life, thereby improving the service life of the heat spreader and thus improving the service life of the foldable electronic device including the heat spreader. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not actual dimensions of the products or actual processes of the methods involved in the embodiments of this application.

[0025] Figure 1 This is a schematic diagram of the structure of a liquid-absorbing core provided in an embodiment of this application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the first braided filament of the central absorbent core;

[0027] Figure 3 This is a schematic diagram of the structure of a heat spreader provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of another heat spreader provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of another heat spreader provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the foldable electronic device provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions in some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application are within the scope of protection of this application.

[0032] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0033] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. For example, in describing some embodiments, the term "connection" may be used to indicate that two or more components have direct physical or electrical contact with each other.

[0035] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0036] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0037] This document describes exemplary embodiments with reference to cross-sectional views, which are intended as idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations caused, for example, by manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0038] With the rapid development of technology, consumer electronics products such as smartphones, tablets, and wearable devices are constantly evolving towards higher performance, higher integration, and miniaturization. While improving computing power and user experience, the core components of these electronic products, such as processors and graphics chips, also bring unprecedented heat dissipation challenges. Due to the significant increase in the power consumption of these components, coupled with the increasingly compact internal space of devices, efficient and stable heat dissipation has become a key factor restricting the performance improvement of consumer electronics products.

[0039] However, traditional heat dissipation methods, such as heat sinks and fans, are inadequate for meeting the heat dissipation needs of modern high-performance consumer electronics. This is especially true for flexible electronic devices, such as foldable phones and flexible displays, whose unique shapes and designs require heat dissipation solutions that are both highly efficient and flexible. Therefore, developing a heat dissipation technology that can meet the demands of high-efficiency heat dissipation while adapting to the structural characteristics of flexible electronic devices is of paramount importance.

[0040] Therefore, flexible vapor chambers have emerged. As an emerging heat dissipation technology, they have gradually gained widespread attention in the industry due to their excellent thermal conductivity, good flexibility, and ability to adapt to complex spatial layouts. However, there are still certain limitations in the design of the wicking structure of flexible vapor chambers. Currently, flexible vapor chambers used in foldable electronic devices are prone to failure after excessive bending, especially the failure of their internal wicking structure. The failure of the wicking structure can lead to the interruption and blockage of the working fluid inside the vapor chamber. This means that traditional wicking structures often cannot simultaneously meet the requirements of efficient heat transfer, good flexibility, and service life, thus limiting the performance of flexible vapor chambers in practical applications.

[0041] To address the aforementioned problems, embodiments of this application provide a liquid-absorbing core. Figure 1 This is a schematic diagram of the structure of a liquid-absorbing core provided in an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the structure of the first braided filament of the liquid-absorbing core.

[0042] See Figure 1 The absorbent core 1 includes multiple first braided filaments 11 and multiple second braided filaments 12. Each first braided filament 11 extends along a first direction X, and each second braided filament 12 extends along a second direction Y. The first direction X and the second direction Y intersect. This application will use the example of the first direction X being perpendicular to the second direction Y for illustration. The multiple first braided filaments 11 and the multiple second braided filaments 12 are interwoven to form a web.

[0043] At least one of the first braided filament 11 and the second braided filament 12 includes a spring-shaped spiral. Exemplarily, the first braided filament 11 includes a spring-shaped spiral, or the second braided filament 12 includes a spring-shaped spiral, or both the first braided filament 11 and the second braided filament 12 include spring-shaped spirals. Figure 1 This illustrates the case where both the first braided filament 11 and the second braided filament 12 are spirals.

[0044] The liquid-absorbing core 1 provided in the embodiments of this application is formed by interlacing first braided filaments 11 and second braided filaments 12 into a mesh, and at least one of the first braided filaments 11 and the second braided filaments 12 includes a spring-shaped helix. This liquid-absorbing core 1 can be applied to a flexible heat exchanger, which is used in foldable electronic devices. The mesh-like liquid-absorbing core 1 has a capillary effect, guiding the flow of liquid working fluid, promoting the evaporation and heat absorption of the liquid working fluid and the condensation and heat release of the gaseous working fluid, thereby achieving rapid and uniform heat exchange inside the heat exchanger.

[0045] Compared to the straight braided filaments in mesh absorbent cores, which are prone to stress concentration and breakage during bending, the absorbent core 1 of this application has spring-like spiral braids. This makes it less prone to stress concentration during bending, giving the absorbent core 1 stronger bending resistance and making it less likely to break. This effectively extends the service life of the absorbent core 1 and the flexible heat spreader plate equipped with the absorbent core 1.

[0046] In some embodiments, see Figure 1 At least one of the first braided filament 11 and the second braided filament 12 includes two spring-shaped helical lines. The two helical lines are intertwined to form a three-dimensional double helix structure. This double helix structure is similar to a "DNA-like double helix structure", which makes it less likely for stress concentration to occur during the bending process of the braided filament. This can further improve the bending resistance of the absorbent core 1 and extend the service life of the absorbent core 1.

[0047] For example, the first braided filament 11 includes two spirals, and the second braided filament 12 can be a single spiral, or the first braided filament 11 is a single spiral and the second braided filament 12 includes two spirals, or both the first braided filament 11 and the second braided filament 12 can include two spirals.

[0048] In some embodiments, see Figure 1 Taking the example of the first braided filament 11 comprising two spirals and the second braided filament 12 comprising a single spiral, both the first braided filament 11 and the second braided filament 12 include spirals, which can improve the bending resistance of the absorbent core 1. Furthermore, compared to the single spiral of the second braided filament 12, the first braided filament 11 has a double spiral structure, making it more resistant to bending. This further enhances the bending resistance of the absorbent core 1 in the extension direction (first direction X) of the first braided filament 1, thereby extending the service life of the absorbent core 1.

[0049] For example, the single spiral of the second braided filament 12 interweaves with the first braided filament 11 at the intersection 130 of the two spirals of the first braided filament 11 to form a web. This weaving method is simple and easy to implement.

[0050] In some embodiments, see Figure 2 The liquid-absorbing core 1 also includes multiple connecting keys 14. The two spirals 13 of the first braided filament 11 are connected by multiple connecting keys 14, which can enhance the connection strength between the two spirals 13 of the first braided filament 11. Furthermore, the presence of multiple connecting keys 14 forms multiple through holes 15 between the two spirals 13. The multiple through holes 15 can form micro-nano pore spaces, which is beneficial to improve the capillary capacity of the liquid-absorbing core 1, promote the flow of liquid working fluid along the extension direction of the first braided filament 1, and help the heat exchange plate equipped with the liquid-absorbing core 1 to achieve rapid and uniform heat exchange.

[0051] In some embodiments, the materials of the first braided filament 11 and the second braided filament 12 both include at least one of copper, aluminum, iron, and stainless steel. Copper has high thermal conductivity, aluminum is lightweight and has good thermal conductivity, stainless steel has strong corrosion resistance, and iron has low cost. Using braided filaments made of materials such as copper, aluminum, iron, and stainless steel can not only realize the capillary action of the liquid absorbent core 1, but also give the liquid absorbent core 1 advantages such as light weight and strong corrosion resistance.

[0052] In addition, the material of the connecting key 14 may also include at least one of copper, aluminum, iron, and stainless steel.

[0053] In some embodiments, see Figure 1 The dimension of the absorbent core 1 in the Z direction is its thickness, which ranges from 100 μm to 500 μm. For example, the thickness of the absorbent core 1 can be 100 μm, 200 μm, 300 μm, 400 μm, or 500 μm. Designing the thickness of the absorbent core 1 between 100 μm and 500 μm provides sufficient structural strength while maintaining a certain degree of flexibility to enhance its resistance to bending. In addition, this thickness range is also beneficial to the capillary action of the absorbent core 1, which can effectively promote the circulation of the working fluid.

[0054] In some embodiments, see Figure 2 The absorbent core 1 also includes a coating 16, which is disposed on the surface of the two spirals 13 of the first braided filament 11, and the coating 16 is also disposed in a plurality of through holes 15 between the two spirals 13. It can be understood that the plurality of through holes 15 serve as micro-nano pore spaces, which can facilitate the storage and attachment of the coating 16.

[0055] In addition, the coating 16 can also be applied to the surface of the second braided filament 12, that is, the coating 16 is applied to the entire surface of the absorbent core 1.

[0056] In some embodiments, see Figure 2 The material of coating 16 includes hydrophilic materials. For example, the absorbent core 1 can be modified and altered by coating or impregnating it with a hydrophilic material or film to form a hydrophilic surface. The material of coating 16 may also include hydrophobic materials. For example, the absorbent core 1 can be modified and altered by coating or impregnating it with a hydrophobic material or film to form a hydrophobic surface.

[0057] Understandably, the vapor chamber of the heat exchanger includes an evaporation end and a condensation end. The wick 1 with a hydrophobic surface can be placed near the evaporation end to reduce the phase change resistance of the liquid working fluid at the evaporation end, thereby improving the efficiency of heat absorption during evaporation. Furthermore, placing the wick 1 with a hydrophilic surface near the condensation end facilitates the condensation of the gaseous working fluid into a liquid state, enhancing the accumulation and flow of the liquid working fluid on the surface of the wick 1 after condensation, thus improving the heat exchange capacity of the heat exchanger.

[0058] On the other hand, embodiments of this application also provide a heat spreader. Figure 3 This is a schematic diagram of the structure of a heat spreader provided in an embodiment of this application; Figure 4 This is a schematic diagram of another heat spreader provided in an embodiment of this application; Figure 5 This is a schematic diagram of another heat spreader provided in an embodiment of this application.

[0059] See Figure 3 The heat exchanger 2 includes an upper shell 21, a lower shell 22, multiple support columns 23, and the liquid-absorbing core 1 in any of the above embodiments. The upper shell 21 and lower shell 22 are connected to form a closed shell, with an interior cavity 24. Multiple support columns 23 are distributed within the cavity 24 and located between the upper shell 21 and lower shell 22. The support columns 23 can be made of polymer or metal and are used to support the upper shell 21 and lower shell 22. The liquid-absorbing core 1 is disposed within the cavity 24. Liquid working fluid is injected into the cavity 24, and the capillary action of the liquid-absorbing core 1 guides the flow of the liquid working fluid, promoting the evaporation and heat absorption of the liquid working fluid and the condensation and heat dissipation of the gaseous working fluid, thus achieving rapid and uniform heat exchange within the heat exchanger.

[0060] For example, both the upper shell 21 and the lower shell 22 include a flexible substrate and a metal film. The metal film is disposed on the side of the flexible substrate away from the cavity 24, that is, the metal film is disposed on the outer side of the flexible substrate, forming a composite material of metal-coated substrate. The metal film and the flexible substrate together serve as the shell of the heat spreader 2, which can improve the flexibility of the shell, ensure the flexible bending performance of the heat spreader 2, enhance the strength of the shell, and improve the thermal conductivity of the shell, thereby enhancing the thermal conductivity of the heat spreader 2.

[0061] For example, the flexible substrate may be made of a polymer, which may include at least one of PI, PET, PP, PVA, or PE, and the thickness of the flexible substrate may range from 50 μm to 100 μm. The metal film may be made of a high thermal conductivity metal such as copper or aluminum, and the thickness of the metal film may range from 20 μm to 80 μm.

[0062] The heat spreader 2 provided in this embodiment is flexible and can be applied to foldable electronic devices. Its cavity 24 includes the liquid absorption core 1 in the above embodiment. Since the bending resistance of the liquid absorption core 1 is improved, the liquid absorption core 1 is not easy to break and fail, which improves the problem of liquid working fluid interruption and blockage caused by the breakage of the liquid absorption core 1. As a result, the bending resistance and service life of the heat spreader 2 are also effectively improved.

[0063] In some embodiments, see Figure 3 The heat spreader 2 includes a multi-layer liquid absorbing core 1, which includes at least one first liquid absorbing core 101 and at least one second liquid absorbing core 102. The first liquid absorbing core 101 and the second liquid absorbing core 102 are not connected. The first liquid absorbing core 101 and the second liquid absorbing core 102 can be a single layer or a multi-layer structure. The multi-layer structure of the first liquid absorbing core 101 and the second liquid absorbing core 102 can provide more reflux channels for the liquid working fluid to enhance the reflux rate of the liquid working fluid, and provide more contact area for the working fluid to improve the capillary capacity of the liquid absorbing core.

[0064] See also Figure 3 The cavity 24 includes an evaporation end near the lower shell 22 and a condensation end near the upper shell 21. The evaporation end serves as a heat input end, and the condensation end serves as a heat output end. The heat in the heat spreader 2 is transmitted and dissipated in the Z direction. By placing the first liquid absorbent core 101 between the multiple support columns 23 and the lower shell 22, the first liquid absorbent core 101 is placed close to the evaporation end. And by placing the second liquid absorbent core 102 between the multiple support columns 23 and the upper shell 21, the second liquid absorbent core 102 is placed close to the condensation end.

[0065] Understandably, the heat source (e.g., electronic device) is located on the side of the lower housing 22 away from the upper housing 21. Heat is input through the lower housing 22 to the evaporation end of the cavity 24. The liquid working fluid flowing on the first wick 101 near the evaporation end absorbs heat and is converted into gaseous working fluid. Driven by the pressure difference within the vacuum cavity 24, the gaseous working fluid flows rapidly within the cavity 24, according to... Figure 3 The direction of the arrow rapidly and evenly diffuses towards the condensation end near the upper shell 21. At the condensation end, the gaseous working fluid releases heat through the upper shell 21, undergoes a condensation phase change, and reverts to a liquid working fluid. The gas-liquid phase change rapidly carries away a large amount of heat. Driven by the capillary pressure of the second wicking core 102, the liquid working fluid flows back and through multiple support columns 23 to the evaporation end to continue absorbing heat, completing the entire gas-liquid cycle and achieving uniform heat dissipation of the heat spreader 2 in the Z direction.

[0066] The first wicking core 101 has a coating of hydrophobic material on its surface, which reduces the resistance to phase change of the liquid working fluid at the evaporation end, promotes the evaporation and heat absorption of the liquid working fluid at the evaporation end, and improves the efficiency of the liquid working fluid's evaporation and heat absorption. The second wicking core 102 has a coating of hydrophilic material on its surface, which facilitates the condensation of the gaseous working fluid into a liquid working fluid, enhances the aggregation and flow of the condensed liquid working fluid on the surface of the wicking core 1, improves the efficiency of liquid working fluid reflux, and thus improves the heat exchange capacity of the heat exchanger plate.

[0067] In some embodiments, see Figure 4 The first liquid absorbing core 101 can be connected to the second liquid absorbing core 102. By utilizing the capillary effect of the liquid absorbing core, the liquid working fluid that has accumulated and flowed on the second liquid absorbing core 102 can be promoted to flow back to the first liquid absorbing core 101, thereby improving the flow rate and effect of the liquid working fluid and thus improving the heat exchange efficiency of the heat exchange plate 2.

[0068] In some embodiments, at least one absorbent core 1 is disposed between the plurality of support columns 23 and the upper housing 21, or at least one absorbent core 1 is disposed between the plurality of support columns 23 and the lower housing 22, or absorbent core 1 is disposed between the plurality of support columns 23 and both the upper housing 21 and the lower housing 22. Figure 5 The diagram shows a configuration where the liquid suction core 1 is positioned between multiple support columns 23 and the lower housing 22.

[0069] See Figure 5 Along the plane (i.e. plane XY) where the heat spreader 2 is located, for example, along the first direction X, the cavity 24 includes an evaporation end (e.g., the right end of the cavity 24 in the figure) and a condensation end (e.g., the left end of the cavity 24 in the figure). The evaporation end serves as one end for heat input, and the condensation end serves as one end for heat output. The liquid absorbent core 1 extends from the evaporation end to the condensation end. Within the structure of this heat spreader 2, heat is transferred along the first direction X.

[0070] Understandably, the heat source (e.g., electronic device) is close to the evaporation end of the cavity 24. Heat is input to the evaporation end of the cavity 24 through the shell. The liquid working fluid flowing on the wick 1 absorbs the heat and is converted into a gaseous working fluid. Driven by the pressure difference inside the vacuum cavity 24, the gaseous working fluid flows rapidly inside the cavity 24, according to... Figure 5 The gaseous working fluid rapidly diffuses uniformly towards the condensation end in the direction of the arrow. At the condensation end, the gaseous working fluid releases heat through the shell, undergoes a condensation phase change, and becomes liquid again. The gas-liquid phase change quickly removes a large amount of heat. Driven by the capillary pressure of the wick 1, the liquid working fluid flows back to the evaporation end to continue absorbing heat, completing the entire gas-liquid cycle and achieving uniform heat dissipation of the heat spreader 2 in the first direction X.

[0071] See also Figure 5 The wick 1 includes a first end 17 near the evaporation end and a second end 18 near the condensation end. The surface of the first end 17 is coated with a hydrophobic material, which reduces the phase change resistance of the liquid working fluid at the evaporation end, promotes the evaporation and heat absorption of the liquid working fluid at the evaporation end, and improves the efficiency of the liquid working fluid evaporation and heat absorption. The surface of the second end 18 is coated with a hydrophilic material, which facilitates the condensation of the gaseous working fluid into a liquid working fluid, enhances the accumulation and flow of the condensed liquid working fluid on the surface of the wick 1, improves the efficiency of the liquid working fluid reflux, and thus improves the heat exchange capacity of the heat exchanger.

[0072] Furthermore, embodiments of this application also provide a foldable electronic device. Figure 6 This is a schematic diagram of the structure of the foldable electronic device provided in an embodiment of this application.

[0073] See Figure 6 The foldable electronic device 3 includes a heat spreader 2 as described in any of the above embodiments and an electronic device 31. The heat spreader 2 is a flexible heat spreader, which can more flexibly match the shape of the foldable electronic device 3. The cavity 24 of the heat spreader 2 includes an evaporation end and a condensation end, with the evaporation end of the heat spreader 2 positioned close to the electronic device 31. Since the liquid-absorbing core 1 in the heat spreader 2 provided in this application embodiment includes a spiral, the spiral improves the bending resistance of the liquid-absorbing core 1, achieving good flexibility and a longer service life, thereby increasing the service life of the flexible heat spreader 2, and consequently increasing the service life of the foldable electronic device 3 including the heat spreader 2.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A liquid-absorbing core, characterized in that, The absorbent core includes multiple first braided filaments and multiple second braided filaments. The first braided filaments extend along a first direction, and the second braided filaments extend along a second direction. The multiple first braided filaments and the multiple second braided filaments are interwoven to form a web, and the first direction and the second direction intersect. At least one of the first braided yarn and the second braided yarn includes a spiral.

2. The absorbent core according to claim 1, characterized in that, At least one of the first braided yarn and the second braided yarn includes two spirals, which are wound together to form a double helix structure.

3. The absorbent core according to claim 2, characterized in that, The liquid-absorbing core also includes multiple connecting keys, and the two spirals are connected by the multiple connecting keys to form multiple through holes between the two spirals.

4. The absorbent core according to claim 3, characterized in that, The liquid-absorbing core also includes a coating, which is disposed on the surface of the spiral and within the plurality of through holes.

5. The absorbent core according to claim 4, characterized in that, The coating material includes hydrophilic or hydrophobic materials.

6. The absorbent core according to claim 1, characterized in that, The first braided yarn includes two spirals, which are wound together to form a double helix structure; The second braided yarn includes a spiral.

7. The absorbent core according to claim 6, characterized in that, One spiral of the second braided filament interweaves with the first braided filament at the intersection of the two spirals of the first braided filament to form a web.

8. The absorbent core according to claim 1, characterized in that, The materials of the first braided wire and the second braided wire both include at least one of copper, aluminum, iron, and stainless steel.

9. The absorbent core according to claim 1, characterized in that, The thickness of the absorbent core ranges from 100 μm to 500 μm.

10. A heat spreader, characterized in that, include: The upper and lower shells are connected to form a cavity; Multiple support columns are disposed within the cavity and located between the upper housing and the lower housing; The suction core as described in any one of claims 1 to 9 is disposed within the cavity.

11. The heat spreader according to claim 10, characterized in that, The heat spreader includes multiple layers of liquid-absorbing cores, and the multiple layers of liquid-absorbing cores include at least one first liquid-absorbing core and at least one second liquid-absorbing core. The cavity includes an evaporation end near the lower shell and a condensation end near the upper shell. The at least one first liquid-absorbing core is disposed between the plurality of support columns and the lower shell, and the at least one second liquid-absorbing core is disposed between the plurality of support columns and the upper shell. The surface of the first absorbent core is provided with a coating including a hydrophobic material, and the surface of the second absorbent core is provided with a coating including a hydrophilic material.

12. The heat spreader according to claim 11, characterized in that, The first absorbent core is connected to the second absorbent core.

13. The heat spreader according to claim 10, characterized in that, At least one of the liquid-absorbing cores is disposed between the plurality of support columns and the lower housing, and / or, is disposed between the plurality of support columns and the upper housing; Along the plane of the heat spreader, the cavity includes an evaporation end and a condensation end opposite to each other, and the liquid suction core includes a first end near the evaporation end and a second end near the condensation end; The surface of the first end is provided with a coating including a hydrophobic material, and the surface of the second end is provided with a coating including a hydrophilic material.

14. The heat spreader according to claim 10, characterized in that, Both the upper housing and the lower housing include a flexible substrate and a metal film, with the metal film disposed on the side of the flexible substrate away from the cavity.

15. A foldable electronic device, characterized in that, include: The heat spreader as described in any one of claims 10 to 14, wherein the cavity of the heat spreader includes an evaporation end and a condensation end; The electronic device is located near the evaporation end of the heat spreader.

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