Shell assembly and foldable electronic equipment

Abstract

The invention discloses a shell assembly and foldable electronic equipment, relates to the technical field of electronic products, and can optimize creases of a folding screen while reducing the temperature difference between a first shell and a second shell. The shell assembly comprises a first shell, a second shell, a rotating shaft mechanism, a supporting piece and a heat conducting piece, the rotating shaft mechanism is connected between the first shell and the second shell, and the first shell can rotate relative to the second shell; the supporting piece is arranged on one side of the rotating shaft mechanism, a containing space is formed between the supporting piece and the rotating shaft mechanism, when the rotating shaft mechanism is in an unfolded state, the supporting piece is arranged on the rotating shaft mechanism in a stacked mode, and when the rotating shaft mechanism is in a folded state, the supporting piece is bent; the heat conduction piece comprises a first heat conduction part, a second heat conduction part and a third heat conduction part, the first heat conduction part is fixedly connected to the first shell, the second heat conduction part is fixedly connected to the second shell, the third heat conduction part is connected between the first heat conduction part and the second heat conduction part, and at least one part of the third heat conduction part is located in the containing space.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to a housing assembly and a foldable electronic device. Background Art

[0002] At present, in order to solve the problem that traditional straight-screen electronic devices are large in size and inconvenient to carry, foldable electronic devices have come into being. The shell assembly of the foldable electronic device includes a first shell, a second shell, and a hinge mechanism connected between the first shell and the second shell. Since the heat generated by the components inside the first shell and the heat generated by the components inside the second shell are usually different, and the heat distribution performance of the foldable electronic device is poor, the temperature difference between the first shell and the second shell is large. In addition, after the foldable electronic device is repeatedly folded, creases are prone to appear on the folding screen. The foldable electronic device in the related art cannot take into account both the heat distribution performance of the foldable electronic device and the creases of the folding screen, which affects the user experience. Summary of the invention

[0003] The embodiments of the present application provide a shell assembly and a foldable electronic device, which can optimize the crease of the folding screen while reducing the temperature difference between the first shell and the second shell.

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

[0005] In the first aspect, the present application provides a shell assembly, which includes: a first shell, a second shell, a rotating shaft mechanism, a support sheet and a heat conducting sheet, the rotating shaft mechanism is connected between the first shell and the second shell, and the first shell can rotate relative to the second shell so that the shell assembly can switch between an expanded state and a folded state; the support sheet is arranged on one side of the rotating shaft mechanism, and there is a accommodating space between the support sheet and the rotating shaft mechanism, when the rotating shaft mechanism is in the expanded state, the support sheet is stacked on the rotating shaft mechanism, and when the rotating shaft mechanism is in the folded state, the support sheet is bent; the heat conducting sheet includes a first heat conducting part, a second heat conducting part and a third heat conducting part, the first heat conducting part is fixedly connected to the first shell, the second heat conducting part is fixedly connected to the second shell, the third heat conducting part is connected between the first heat conducting part and the second heat conducting part, and at least a part of the third heat conducting part is located in the accommodating space.

[0006] The housing assembly provided by the present application can separate the folding screen from the third heat-conducting portion of the heat-conducting portion by providing a support sheet and a heat-conducting sheet, and providing the third heat-conducting portion of the heat-conducting sheet between the support sheet and the rotating shaft mechanism, thereby preventing the third heat-conducting portion of the heat-conducting sheet from directly contacting the folding screen, and thus preventing the third heat-conducting portion from pressing the screen during the folding process of the foldable electronic device, thereby reducing the risk of the folding screen being pulled and causing an arch during the bending process, and improving the reliability of the folding screen. At the same time, when the foldable electronic device is in the unfolded state, the folding screen can be effectively supported by the support sheet, which can improve the flatness of the folding screen in the unfolded state, and is conducive to reducing screen light and shadow and optimizing the folding screen crease.

[0007] In a possible implementation of the first aspect, the shaft mechanism includes a base, a first rotating door plate and a second rotating door plate, the first rotating door plate and the second rotating door plate are rotatably connected to opposite sides of the base, the first rotating door plate includes a first supporting surface, the second rotating door plate includes a second supporting surface, and when the shell assembly is in an unfolded state, the supporting sheet is stacked on the first supporting surface and the second supporting surface; the third heat conducting part includes a first section and a second section, the first section is located between the supporting sheet and the first rotating door plate, and the second section is located between the supporting sheet and the second rotating door plate. A specific structure of the shaft mechanism is provided.

[0008] In a possible implementation of the first aspect, the rotating shaft mechanism further includes an intermediate door plate, the intermediate door plate is located between the first rotating door plate and the second rotating door plate, the intermediate door plate includes a third supporting surface, and when the shell assembly is in an expanded state, the first supporting surface, the second supporting surface, and the third supporting surface are oriented in the same direction; the third heat conducting portion further includes a third section, the third section is connected between the first section and the second section, and the third section is located between the supporting sheet and the intermediate door plate. Another specific structure of the rotating shaft mechanism is provided.

[0009] In a possible implementation of the first aspect, the first rotating door plate includes a first bottom surface, the first bottom surface is opposite to the first supporting surface, a first sinking groove is provided on the first supporting surface and is recessed toward the first bottom surface, a first accommodating groove is defined between the supporting sheet and the first sinking groove, and at least a portion of the first section is located in the first accommodating groove. In this way, it is convenient for the supporting sheet to be supported on the first supporting surface when the housing assembly is in an unfolded state, and while ensuring the supporting area of ​​the supporting sheet by the rotating shaft mechanism, the superimposed dimensions of the first rotating door plate, the first section and the supporting sheet in the thickness direction of the rotating shaft mechanism can be reduced, which is conducive to reducing the overall thickness of the housing assembly, and further conducive to realizing a thin design of the foldable electronic device.

[0010] In a possible implementation of the first aspect, the second rotating door plate includes a second bottom surface, the second bottom surface is opposite to the second supporting surface, a second recessed groove is provided on the second supporting surface and is recessed toward the second bottom surface, a second receiving groove is defined between the supporting sheet and the second recessed groove, and at least a portion of the second section is located in the second receiving groove. In this way, the stacked dimensions of the second rotating door plate, the second section, and the supporting sheet in the thickness direction of the rotating shaft mechanism can be reduced, which is conducive to reducing the overall thickness of the housing assembly, and further conducive to realizing a thin design of the foldable electronic device.

[0011] In a possible implementation of the first aspect, the middle door panel includes a third bottom surface, the third bottom surface is opposite to the third supporting surface, the third supporting surface is provided with a third recessed groove recessed toward the third bottom surface, a third accommodating groove is defined between the supporting sheet and the third recessed groove, and at least a portion of the third section is located in the third accommodating groove. In this way, the stacked dimensions of the middle door panel, the third section, and the supporting sheet in the thickness direction of the rotating shaft mechanism can be reduced, which is conducive to reducing the overall thickness of the housing assembly, and further conducive to realizing a thin design of the foldable electronic device.

[0012] In a possible implementation of the first aspect, the first rotating door plate includes a first inner side surface and a first outer side surface facing each other, and when the housing assembly is in an unfolded state, the first inner side surface faces the second rotating door plate, and the first recessed groove runs through the first inner side surface and the first outer side surface. In this way, it is convenient to assemble the first section in the first recessed groove, and it is helpful to reduce the overlapping dimension of the first section and the first rotating door plate in the thickness direction of the shaft mechanism, which is helpful to realize the thin design of the housing assembly and the foldable electronic device.

[0013] In a possible implementation of the first aspect, the second rotating door plate includes a second inner side surface and a second outer side surface facing each other, and when the housing assembly is in an unfolded state, the second inner side surface faces the first rotating door plate, and the second recessed groove runs through the second inner side surface and the second outer side surface. In this way, it is convenient to assemble the second section in the second recessed groove, and it is helpful to reduce the overlapping dimension of the second section and the second rotating door plate in the thickness direction of the rotating shaft mechanism, which is helpful to realize the thin design of the housing assembly and the foldable electronic device.

[0014] In a possible implementation of the first aspect, the middle door panel includes a first side wall surface and a second side wall surface opposite to each other, and when the hinge mechanism is in an unfolded state, the first side wall surface faces the first rotating door panel, and the second side wall surface faces the second rotating door panel. The third recessed groove runs through the first side wall surface and the second side wall surface. In this way, it is convenient to assemble the third section in the third recessed groove, and it is helpful to reduce the overlapping dimension of the third section and the middle door panel in the thickness direction of the hinge mechanism, which is helpful to realize the thin design of the housing assembly and the foldable electronic device.

[0015] In a possible implementation of the first aspect, when the housing assembly is in the unfolded state, the first section is parallel to the first support surface. In this way, the size of the first section is not redundant, which is conducive to preventing the first section from being clamped in the gap of the shaft mechanism during the folding process of the shaft mechanism, and is conducive to reducing the step difference between the first heat conducting portion and the first section, thereby facilitating reducing the bending stress of the heat conducting sheet when the shaft mechanism is in the unfolded state. In addition, the space occupied by the first section in the thickness direction of the shaft structure can be reduced, which is conducive to reducing the thickness of the shaft mechanism.

[0016] In a possible implementation of the first aspect, when the housing assembly is in the unfolded state, the second section is parallel to the second support surface. In this way, the size of the second section is not redundant, which is conducive to preventing the second section from being clamped in the gap of the shaft mechanism during the folding process of the shaft mechanism, and is conducive to reducing the step difference between the second heat conducting portion and the second section, thereby facilitating reducing the bending stress of the heat conducting sheet when the shaft mechanism is in the unfolded state. In addition, the space occupied by the second section in the thickness direction of the shaft structure can be reduced, which is conducive to reducing the thickness of the shaft mechanism.

[0017] In a possible implementation of the first aspect, the first sink includes a first bottom wall surface, the orientation of the first bottom wall surface is the same as the orientation of the first support surface, and the first bottom wall surface is parallel to the first support surface; when the shell assembly is in the expanded state, the first section is supported on the first bottom wall surface. In this way, when the shell assembly is in the expanded state, the flatness of the first section can be ensured, and the non-redundant design of the first section can be achieved, thereby reducing the bending stress on the first section, which is conducive to avoiding the occurrence of reverse arches in the first section. At the same time, it is also conducive to reducing the size of the first sink in the thickness direction of the shaft mechanism, which is conducive to improving the structural strength of the shaft mechanism.

[0018] In a possible implementation of the first aspect, the second sink includes a second bottom wall surface, the second bottom wall surface is oriented in the same direction as the second support surface, and the second bottom wall surface is parallel to the second support surface; when the shell assembly is in the expanded state, the second section is supported on the second bottom wall surface. In this way, when the shell assembly is in the expanded state, the flatness of the second section can be ensured, thereby reducing the bending stress on the second section, which is beneficial to avoid the first section from having an anti-arch. At the same time, it is also beneficial to reduce the size of the second sink in the thickness direction of the shaft mechanism, which is beneficial to improve the structural strength of the shaft mechanism.

[0019] In a possible implementation of the first aspect, when the shell assembly is in the expanded state, the first bottom wall surface and the second bottom wall surface are arranged in the same plane. Specifically, when the shell assembly is in the expanded state, the first bottom wall surface and the second bottom wall surface are located in the same plane. In this way, it can be ensured that the dimensions of the first section and the second section are non-redundant.

[0020] In a possible implementation of the first aspect, the first shell includes a first fixed surface, the first heat conducting portion is fixedly connected to the first fixed surface, and the first fixed surface is coplanar with the first bottom wall surface. In this way, when the shell assembly is in an expanded state, the first heat conducting portion and the first section can be transitioned through a straight line segment, which can eliminate the step difference between the first heat conducting portion and the first section, avoid bending between the first heat conducting portion and the first section, and thus reduce the bending stress on the heat conducting sheet.

[0021] In a possible implementation of the first aspect, the third sink includes a third bottom wall surface, the third bottom wall surface is oriented in the same direction as the third support surface, and the third bottom wall surface is parallel to the third support surface; when the shell assembly is in the expanded state, the third section is supported on the third bottom wall surface. In this way, when the shell assembly is in the expanded state, the flatness of the third section can be ensured, thereby reducing the bending stress on the third section.

[0022] In a possible implementation of the first aspect, when the shell assembly is in the expanded state, the third bottom wall surface is coplanar with the first bottom wall surface. In this way, when the shell assembly is in the expanded state, the first section and the third section can be transitioned through a straight line section, which can eliminate the step difference between the third section and the first section, avoid bending between the third section and the first section, and help reduce the bending stress on the third heat conducting portion.

[0023] In a possible implementation of the first aspect, when the shell assembly is in the expanded state, the third bottom wall surface is coplanar with the second bottom wall surface. In this way, when the shell assembly is in the expanded state, the second section and the third section can be transitioned through a straight line section, which can eliminate the step difference between the third section and the second section, avoid bending between the third section and the second section, and help reduce the bending stress on the third heat conducting portion.

[0024] In a possible implementation of the first aspect, when the shell assembly is in the unfolded state, the first bottom wall surface, the second bottom wall surface, and the third bottom wall surface are oriented in the same direction and are coplanar. Thus, when the shell assembly is in the unfolded state, the third heat conducting portion is in the shape of a flat plate, and the size of the third heat conducting portion is not redundant. Thus, when the rotating shaft mechanism is folded, the third heat conducting portion can be prevented from being clamped in the gap of the rotating shaft mechanism, and the material used for the heat conducting sheet can be reduced, which is conducive to reducing costs.

[0025] In a possible implementation of the first aspect, the first section is connected to the first rotating door panel through a buffer material, and / or the second section is connected to the second rotating door panel through a buffer material. In this way, on the one hand, the positions of the first section and the second section can be limited by the buffer material, reducing the displacement of the first section and the second section relative to the rotating mechanism, and preventing the first section and the second section from being clamped in the gap of the rotating shaft mechanism; on the other hand, since the buffer material has a certain deformation capacity, when the third heat conducting part is bent together with the rotating shaft mechanism, the deformation of the buffer material can be used to reduce the stress on the third heat conducting part, which can reduce the stretching rate of the third heat conducting part, thereby facilitating the improvement of the reliability of the third heat conducting part and reducing the possibility of the third heat conducting part being damaged by fracture, delamination, etc.

[0026] In a possible implementation of the first aspect, the buffer material piece is an adhesive. For example, the adhesive can be UV curing adhesive, hot melt adhesive, lead adhesive, white glaze adhesive, foam adhesive, silicone, etc. A specific example of a buffer material piece is provided.

[0027] In a possible implementation of the first aspect, when the rotating shaft mechanism is in the unfolded state, the third section is parallel to the third supporting surface. In this way, the size of the third section is not redundant, which helps to prevent the third section from being clamped in the gap of the rotating shaft mechanism during the folding process of the rotating shaft mechanism. At the same time, it is also helpful to reduce the size of the third sink in the thickness direction of the rotating shaft mechanism, which helps to improve the structural strength of the rotating shaft mechanism.

[0028] In a possible implementation of the first aspect, at least a portion of the third section is arched in a direction away from the support sheet to form an arched section. That is, the length of the third section is greater than the distance between the first section and the second section. The size of the third section has a certain redundancy. In this way, the stress on the third heat conducting portion during the bending process can be reduced, thereby improving the reliability of the third heat conducting portion, effectively avoiding the third heat conducting portion from being arched due to multiple foldings, and further reducing the force of the third heat conducting portion acting on the folding screen during the bending process.

[0029] In a possible implementation of the first aspect, the middle door panel includes a third bottom surface, the third bottom surface is opposite to the third supporting surface, the third supporting surface is provided with a third groove recessed toward the third bottom surface, and the arched section is located in the third groove. In this way, the arched section can be accommodated by the third groove. In this way, when the rotating shaft mechanism is in the unfolded state, the stress on the third section can be reduced, and the third section can be kept stretched, so as to avoid the third section from bending due to insufficient accommodation space, thereby facilitating the improvement of the reliability of the heat conducting sheet.

[0030] In a possible implementation of the first aspect, the third groove includes a third groove bottom wall, a first groove side wall, and a second groove side wall, the third groove bottom wall faces the support sheet; the first groove side wall is connected to a side of the third groove bottom wall close to the first rotating door panel; the second groove side wall is connected to a side of the third groove bottom wall close to the second rotating door panel; in the direction from the middle door panel to the support sheet, the first groove side wall extends in a direction close to the first rotating door panel, and the second groove side wall extends in a direction close to the second rotating door panel. In this way, the extrusion stress of the third section can be further reduced, stress concentration on the third section can be avoided, and the reliability of the third section can be further improved.

[0031] In a possible implementation of the first aspect, the third groove includes a third groove bottom wall, the third groove bottom wall faces the support sheet; the housing assembly further includes a limit plate, the limit plate is disposed on the middle door panel, the limit plate is opposite to and spaced from the third groove bottom wall, and the arched section is located between the limit plate and the third groove bottom wall. In this way, the limit plate can limit the movement of the third section in the thickness direction of the rotating shaft mechanism, which can further reduce the influence of the third section's reverse arch on the folding screen.

[0032] In a possible implementation of the first aspect, the limiting plate is detachably connected to the middle door plate, thereby preventing the size of the third groove from limiting the size of the first heat conducting portion and the second heat conducting portion, thereby improving the heat dissipation capacity of the housing assembly and the heat dissipation performance of the housing assembly.

[0033] In a possible implementation of the first aspect, when the housing assembly switches between the unfolded state and the folded state, at least a portion of the support sheet can slide relative to the hinge mechanism, so that the support sheet can be bent together with the folding screen.

[0034] In a possible implementation of the first aspect, the support sheet is fixedly connected to the first rotating door panel, and the support sheet is slidably connected to the second rotating door panel. A specific implementation is provided.

[0035] In a possible implementation of the first aspect, the support sheet includes a first surface and a second surface facing each other, and a first side surface and a second side surface facing each other, the second surface faces the rotating shaft mechanism, and when the shell assembly is in an unfolded state, the first side surface faces the first shell; the second surface is provided with a step groove that avoids the first surface, the step groove runs through the first side surface and the second side surface, and an accommodation space is defined between the step groove and the rotating shaft mechanism. Another method for defining the accommodation space is provided.

[0036] In a possible implementation of the first aspect, the heat conducting sheet includes a heat conducting layer, a first protective layer and a second protective layer, wherein the first protective layer covers a surface of the heat conducting layer facing away from the rotating shaft mechanism, and the second protective layer covers a surface of the heat conducting layer facing the rotating shaft mechanism. A laminated structure of a heat conducting sheet is provided.

[0037] In a possible implementation of the first aspect, the first shell includes a first fixed surface, the first heat conducting part is fixedly connected to the first fixed surface, the heat conducting sheet includes a first wear-resistant layer, the first wear-resistant layer is arranged on the side of the first protective layer away from the heat conducting layer, and when the shell assembly is in an unfolded state, the orthographic projection of the first wear-resistant layer on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism on the reference plane, and the orthographic projection of the first wear-resistant layer on the reference plane does not overlap with the orthographic projection of the first fixed surface on the reference plane, wherein the reference plane is parallel to the first fixed surface. In this way, when the heat conducting sheet is applied to a foldable electronic device, the thickness of the first shell of the foldable electronic device can be reduced, which is conducive to realizing a thin design of the foldable electronic device, and can reduce the material used for the first wear-resistant layer, which is conducive to reducing costs.

[0038] In a possible implementation of the first aspect, the second heat conducting portion is fixedly connected to the second fixed surface, and when the housing assembly is in an unfolded state, the orthographic projection of the first wear-resistant layer on the reference plane does not overlap with the orthographic projection of the second fixed surface on the reference plane. In this way, when the heat conducting sheet is applied to a foldable electronic device, the thickness of the second housing of the foldable electronic device can be reduced, which is conducive to realizing a thin design of the foldable electronic device, and can reduce the material used for the first wear-resistant layer, which is conducive to reducing costs.

[0039] In a possible implementation of the first aspect, the heat conductive sheet includes a second wear-resistant layer, the second wear-resistant layer is arranged on the side of the second protective layer away from the heat conductive layer, and when the shell assembly is in an unfolded state, the orthographic projection of the second wear-resistant layer on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism on the reference plane, and the orthographic projection of the second wear-resistant layer on the reference plane does not overlap with the orthographic projection of the first fixed surface on the reference plane; wherein the reference plane is parallel to the first fixed surface. In this way, when the heat conductive sheet is applied to a foldable electronic device, the thickness of the first shell of the foldable electronic device can be reduced, which is conducive to realizing a thin design of the foldable electronic device, and can reduce the material used for the second wear-resistant layer, which is conducive to reducing costs.

[0040] In a possible implementation of the first aspect, when the shell assembly is in the unfolded state, the orthographic projection of the second wear-resistant layer on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism on the reference plane, and the orthographic projection of the second wear-resistant layer on the reference plane does not overlap with the orthographic projection of the second fixed surface on the reference plane. In this way, when the thermal conductive sheet is applied to a foldable electronic device, the thickness of the second shell of the foldable electronic device can be reduced, which is conducive to realizing a thin design of the foldable electronic device, and can reduce the material used for the second wear-resistant layer, which is conducive to reducing costs.

[0041] In a possible implementation of the first aspect, the elongation at break of the heat-conducting layer is greater than or equal to 3.5%, so that the reliability of the heat-conducting sheet can be improved and the heat-conducting sheet can be prevented from breaking during the bending process.

[0042] In a second aspect, the present application provides a foldable electronic device, which includes a shell assembly and a foldable screen. The shell assembly is the shell assembly in any of the above technical solutions, and the foldable screen is arranged in the shell assembly.

[0043] In a possible implementation of the second aspect, the folding screen includes a first part, a second part and a third part, the third part is connected between the first part and the second part, the first part is supported by the first shell, the second part is supported by the second shell, and the third part is supported by the hinge mechanism.

[0044] In a third aspect, the present application provides a heat conductive sheet, comprising a heat conductive layer, a first protective layer and a second protective layer, wherein the first protective layer covers a surface of the heat conductive layer facing away from the rotating shaft mechanism; the second protective layer covers a surface of the heat conductive layer facing the rotating shaft mechanism.

[0045] Among them, the technical effects brought about by any implementation method in the second aspect to the third aspect can refer to the technical effects brought about by different implementation methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A three-dimensional diagram of a foldable electronic device in an unfolded state provided by some embodiments of the present application;

[0047] Figure 2 for Figure 1 A schematic diagram of a partial exploded structure of a foldable electronic device shown;

[0048] Figure 3 for Figure 1 A schematic diagram of the structure of the foldable electronic device shown in FIG. 1 when the foldable electronic device is in a folded state;

[0049] Figure 4 for Figure 1 A cross-sectional view of the foldable electronic device shown at line AA;

[0050] Figure 5a A schematic diagram of temperature simulation of a foldable electronic device in the related art;

[0051] Figure 5b It is a schematic diagram of temperature simulation of a foldable electronic device 100 in other related technologies;

[0052] Figure 6 A perspective view of a housing assembly provided for some embodiments of the present application;

[0053] Figure 7 for Figure 6 The schematic diagram of the assembly of the housing assembly and the folding screen is shown;

[0054] Figure 8 A perspective view of a housing assembly provided for some embodiments of the present application;

[0055] Fig. 9 for Figure 8 an exploded view of the housing assembly shown;

[0056] Fig.10 for Figure 8 A three-dimensional view of the shaft mechanism in the housing assembly shown;

[0057] Fig.11 for Fig.10 A schematic diagram of the rotating shaft mechanism shown in the folded state;

[0058] Fig.12 for Fig.10 The schematic diagram of the assembly of the rotating shaft mechanism and the supporting sheet is shown;

[0059] Fig.13 for Fig.12 The assembly schematic shown is a cross-sectional view at line BB;

[0060] Fig.14 for Fig.10 A schematic diagram of the rotating shaft mechanism and the supporting sheet in a folded state is shown;

[0061] Fig.15 for Fig.13 A schematic diagram of the structure of the first rotating door panel and the second rotating door panel in the rotating shaft mechanism when they rotate relative to each other;

[0062] Fig.16 for Fig.12 The assembly schematic shown is a cross-sectional view at line CC;

[0063] Fig.17 for Figure 8 A partial cross-sectional view of the shell assembly shown at line DD;

[0064] Fig.18 for Fig.17 The schematic diagram of the assembly of the housing assembly and the folding screen is shown;

[0065] Fig.19a for Fig. 9 A schematic diagram of the laminated structure of the heat conducting sheet in the housing assembly shown;

[0066] Fig.19b It is a schematic diagram of a laminated structure of a heat conducting sheet in the prior art;

[0067] Fig. 20 for Fig.19a A schematic diagram of the structure of the first wear-resistant layer in the heat conductive sheet shown;

[0068] Fig.21 A schematic diagram of the structure of the first wear-resistant layer provided in some other embodiments of the present application;

[0069] Fig. 22 A partial cross-sectional view of a housing assembly provided for some other embodiments of the present application;

[0070] Fig.23 for Fig. 22 A schematic diagram of the shaft mechanism in the cross-sectional view shown;

[0071] Fig.24 A partial cross-sectional view of a housing assembly provided for some other embodiments of the present application;

[0072] Fig.25 for Fig.24 a perspective view of the middle door panel of the housing assembly shown;

[0073] Fig.26 A perspective view of a housing assembly is provided for some other embodiments of the present application;

[0074] Fig. 27 for Fig.26 The schematic diagram of the assembly of the limit plate and the rotating shaft mechanism in the housing assembly shown;

[0075] Fig.28 for Fig. 27 An exploded view of the limit plate and the rotating shaft mechanism shown;

[0076] Fig.29 A three-dimensional diagram of a support sheet provided for some other embodiments of the present application;

[0077] Fig.30 for Figure 8 The schematic diagram of temperature simulation of a foldable electronic device after the shell assembly is applied to the foldable electronic device is shown.

[0078] Reference numerals:

[0079] 100. Foldable electronic devices;

[0080] 10. Folding screen; 10a. Screen; 10b. Support structure; 11. First part; 12. Second part; 13. Third part;

[0081] 20, housing assembly; 21, first housing; 211, first middle frame; 211a, first fixing surface; 212, first back cover; C1, first accommodating cavity; 22, second housing; 221, second middle frame; 221a, second fixing surface; 222, second back cover; C2, second accommodating cavity;

[0082] 23. Rotating shaft mechanism; 230. Base; 2301. Bottom plate; 2302. Side panel;

[0083] 231, first rotating door panel; 2311, first supporting surface; 2312, first bottom surface; 2313, first inner side surface; 2314, first outer side surface; 231a, first sink; 231a1, first bottom wall surface; 231b, first groove;

[0084] 232, second rotating door panel; 2321, second supporting surface; 2322, second bottom surface; 2323, second inner side surface; 2324, second outer side surface; 232a, second sink groove; 232a1, second bottom wall surface; 232b, second groove;

[0085] 233, middle door panel; 2331, third supporting surface; 2332, third bottom surface; 2333, first side wall surface; 2334, second side wall surface; 233a, third sinking groove; 233b, third groove; 233c, mounting groove; 234, limiting plate;

[0086] 24, heat conducting sheet; 241, first heat conducting part; 242, second heat conducting part; 243, third heat conducting part; 2431, first section; 2432, second section; 2433, third section; 2433a, arched section; 24a, heat conducting layer; 24b, first protective layer; 24c, second protective layer; 24d, first wear-resistant layer; 24d1, first hollow hole; 24e, second wear-resistant layer; 24f, first heat conducting layer; 24g, third protective layer; 24h, fourth protective layer; 25k, adhesive layer;

[0087] 25, support sheet; 25a, first surface; 25b, second surface; 25c, first side surface; 25d, second side surface; 25e, step groove; 251, first support portion; 252, second support portion; 253, third support portion;

[0088] 31. Mainboard; 32. Battery; 33. Heating element;

[0089] 40. Fasteners;

[0090] 60. First bonding structure; 70. Lubricating structure; 80. Accommodating space; 81. First accommodating groove; 82. Second accommodating groove; 83. Third accommodating groove; 90. Buffer material. DETAILED DESCRIPTION

[0091] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0092] In the embodiments of the present application, the terms "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0093] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0094] In the description of the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present application generally indicates that the associated objects before and after are in an "or" relationship.

[0095] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship remains unchanged after the connection. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. "Sliding connection" means that the two are connected to each other and can slide relative to each other after the connection. "Transmission connection" means that the movement of one of the two connected parts can be transmitted to the other part, and the connection method between the two parts includes but is not limited to at least one of the connection methods such as rotational connection, sliding connection, gear meshing transmission connection, sprocket transmission connection, and cam mechanism transmission connection.

[0096] In the description of the embodiments of the present application, the terms "consistent in direction", "perpendicular", "parallel", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement being discussed and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°, 8°, or 10°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°, 8°, or 10°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, the difference between the two equals is less than or equal to 5%, 8%, or 10% of either one.

[0097] To facilitate understanding, before introducing the shell assembly and the foldable electronic device in the embodiments of the present application in detail, the relevant terms involved in the embodiments of the present application are first explained.

[0098] Thermal conduction connection: refers to a connection with heat transfer between two components.

[0099] Elongation at break: When an object is stretched to pieces by an external force, the ratio of the elongated length after stretching to the length before stretching is called elongation at break, expressed as a percentage.

[0100] An embodiment of the present application provides a foldable electronic device. Under different usage requirements, the foldable electronic device can be unfolded to an unfolded state, can be folded to a folded state, or can be in an intermediate state between the unfolded state and the folded state. That is to say, the foldable electronic device has at least two states, namely the unfolded state and the folded state. In some cases, a third state may be further included, namely an intermediate state between the unfolded state and the folded state. It can be understood that the intermediate state does not have only a unique state, and can be any one or more states of the foldable electronic device between the unfolded state and the folded state.

[0101] Specifically, the foldable electronic device can be a user equipment (UE) or a terminal device, for example, the foldable electronic device can be a tablet computer (portable android device, PAD), a personal digital assistant (PDA), a laptop, an electronic reader, a handheld device with a wireless communication function, a computing device, a vehicle-mounted device, a wearable device (including but not limited to a smart watch, a smart bracelet, etc.), a virtual reality (VR) terminal device (such as VR glasses, etc.), an augmented reality (AR) terminal device (such as AR glasses, etc.), a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, and other mobile terminals or fixed terminals. In the embodiment of the present application, the form of the foldable electronic device is not specifically limited.

[0102] See also Figure 1-Figure 2 , Figure 1 A three-dimensional diagram of a foldable electronic device 100 in an unfolded state provided in some embodiments of the present application, Figure 2 for Figure 1 The schematic diagram of the partial exploded structure of the foldable electronic device 100 is shown. This embodiment and the following embodiments are exemplified by taking the foldable electronic device 100 as a handheld device with a wireless communication function, and the handheld device with a wireless communication function may be, for example, a mobile phone.

[0103] The foldable electronic device 100 is approximately in the shape of a rectangular flat plate in the unfolded state. In order to facilitate the description of the embodiments below, an XYZ coordinate system is established for the foldable electronic device 100 in the unfolded state, and the length direction of the foldable electronic device 100 is defined as the X-axis direction, the width direction of the foldable electronic device 100 is defined as the Y-axis direction, and the thickness direction of the foldable electronic device 100 is defined as the Z-axis direction. It can be understood that the coordinate system setting of the foldable electronic device 100 can be flexibly set according to actual needs, and no specific limitation is made here. In some other embodiments, the shape of the foldable electronic device 100 can also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.

[0104] See also Figure 1-Figure 2 The foldable electronic device 100 includes a folding screen 10 and a shell assembly 20.

[0105] In some embodiments, see Figure 2 The folding screen 10 includes a screen 10a and a supporting structure 10b which are stacked. The screen 10a is used to display information such as images and videos. The screen 10a is a flexible screen that can bend and deform between a folded state and an unfolded state. Exemplarily, the screen 10a can be an organic light-emitting diode (OLED) screen, a micro organic light-emitting diode (micro organic light-emitting diode) screen, a quantum dot light emitting diode (QLED) screen, etc.

[0106] The screen 10a has a display surface for displaying image information, and the display surface of the screen 10a is exposed to facilitate presenting images, videos and other information to the user. The support structure 10b is arranged on the side of the screen 10a facing away from the display surface, and is stacked with the screen 10a. The support structure 10b is also called a bamboo book, which is used to increase the structural strength of the folding screen 10, and the support structure 10b can be folded together with the screen 10a. The support structure 10b can be in the form of a thin sheet, and the material of the support structure 10b can be metals such as stainless steel and titanium alloy, or it can be a carbon fiber material. These materials have a certain hardness and a large elastic modulus, which can improve the hardness and bending resilience of the screen 10a.

[0107] See also Figure 1 and Figure 2 The folding screen 10 includes a first part 11, a second part 12 and a third part 13. The first part 11, the second part 12 and the third part 13 are each composed of a partial screen 10a and a partial support structure 10b opposite thereto. The third part 13 is connected between the first part 11 and the second part 12.

[0108] exist Figure 1 In the foldable electronic device 100 shown, the foldable screen 10 is in the unfolded state, and the first part 11, the third part 13, and the second part 12 are arranged in sequence along the X-axis direction, so that the foldable electronic device 100 can be folded in the longitudinal direction. In some other embodiments, when the foldable screen 10 is in the unfolded state, the first part 11, the third part 13, and the second part 12 can also be arranged in sequence along the Y-axis direction. In this way, the foldable electronic device 100 can be folded in the horizontal direction. When the foldable screen 10 is in the unfolded state, a large screen display can be achieved to provide users with richer information and bring users a better user experience.

[0109] See also Figure 3 , Figure 3 for Figure 1 The schematic diagram of the structure of the foldable electronic device 100 is shown in a folded state, and the foldable screen 10 in the foldable electronic device 100 is also in a folded state. Specifically, when the foldable screen 10 is in a folded state, the first part 11 of the foldable screen 10 is opposite to the second part 12, and the third part 13 is bent. At this time, the third part 13 can be in a water drop shape, a U shape, etc. In this state, the size of the foldable electronic device 100 is small and easy to carry.

[0110] It should be noted that Figure 3 In the illustrated embodiment, when the foldable electronic device 100 is in the folded state, the housing assembly 20 is protected outside the folding screen 10, and the folding screen 10 is not visible to the user. That is, the foldable electronic device 100 is an inner folding electronic device. In other embodiments, when the foldable electronic device 100 is in the folded state, the folding screen 10 may also be located outside the housing assembly 20, and the folding screen 10 is visible to the user. That is, the foldable electronic device 100 is an outer folding electronic device.

[0111] The housing assembly 20 is used to carry the folding screen 10. Figure 2 The housing assembly 20 includes a first housing 21, a second housing 22, and a hinge mechanism 23. The first housing 21 is used to carry the first part 11 of the folding screen 10. The second housing 22 is used to carry the second part 12 of the folding screen 10. The first housing 21 can rotate between the unfolded position and the folded position relative to the second housing 22, so that the housing assembly 20 can switch between the unfolded state and the folded state. The hinge mechanism 23 is connected between the first housing 21 and the second housing 22, and is used to carry the third part 13 of the folding screen 10. The hinge mechanism 23 is used to realize the relative rotation between the second housing 22 and the first housing 21.

[0112] See also Figure 2 The length direction of the rotating shaft mechanism 23 is parallel to the Y axis direction, the width direction is parallel to the X axis direction, and the thickness direction is parallel to the Z axis direction. The first shell 21 and the second shell 22 can be located on both sides of the rotating shaft mechanism 23 in the width direction.

[0113] In this embodiment, the shell assembly 20 includes two shells, a first shell 21 and a second shell 22, and the shell assembly 20 can be folded once. It can be understood that in other embodiments, the shell assembly 20 can also include three, four or more shells. That is, in addition to the above-mentioned first shell 21 and second shell 22, the shell assembly 20 can also include at least one third shell. In this case, the first shell 21, the second shell 22 and at least one third shell can be connected in sequence, and the two adjacent shells can be connected by a rotating shaft mechanism 23. In this way, the shell assembly 20 can be folded multiple times (twice or more).

[0114] See also Figure 4 , Figure 4 for Figure 1 The cross-sectional view of the foldable electronic device 100 shown is at the AA line. The first shell 21 may include a first middle frame 211 and a first back cover 212, and the first part 11 of the folding screen 10 is carried on the first middle frame 211. The first back cover 212 is fixedly connected to the side of the first middle frame 211 away from the first part 11, and the first back cover 212 can be replaced by a display screen (such as an LCD display screen). The first shell 21 can be connected to the hinge mechanism 23 by means of the first middle frame 211 or the first back cover 212. A first accommodating cavity C1 is formed between the first middle frame 211 and the first back cover 212, and the first accommodating cavity C1 can be used to accommodate functional devices such as a mainboard 31 and a camera module.

[0115] The second shell 22 may include a second middle frame 221 and a second back cover 222, and the second part 12 of the folding screen 10 is carried on the second middle frame 221. The second back cover 222 is fixedly connected to the side of the second middle frame 221 away from the second part 12, and the second back cover 222 can be replaced by a display screen (such as an LCD display screen). The second shell 22 can be connected to the hinge mechanism 23 by means of the second middle frame 221 or the second back cover 222. A second accommodating cavity C2 is formed between the second middle frame 221 and the second back cover 222. The second accommodating cavity C2 can be used to accommodate functional devices such as speaker modules, arrays, and batteries 32.

[0116] See also Figure 4 The foldable electronic device 100 further includes a heating element 33. The heating element 33 is a component that generates heat or a module composed of multiple components. Exemplarily, the heating element 33 can be a system on chip (SOC), a central processing unit (CPU), a graphics processing unit (GPU), and other chips. The heating element 33 can be set on the motherboard 31.

[0117] In some embodiments, the heating element 33 (such as a SOC chip) as the main heat source of the foldable electronic device 100 can be disposed in one of the first shell 21 and the second shell 22. This causes the temperature of the shell provided with the heating element 33 to be higher than the temperature of the other shell not provided with the heating element 33. For example, in this embodiment, the heating element 33 is disposed in the first shell 21, in which case the temperature of the first shell 21 is higher than the temperature of the second shell 22.

[0118] The heat dissipation problems and challenges currently faced by the foldable electronic device 100 include the following aspects:

[0119] First, with the development of technology, the thickness of the foldable electronic device 100 is designed to be thinner and thinner. In this case, the thickness direction (for example, Figure 4 The thermal resistance in the Z-axis direction (in the Z-axis direction) is small, and the heat generated by the heating element 33 can more easily reach the surface of the foldable electronic device 100, causing local hot spots. On the second hand, since the hinge mechanism 23 of the foldable electronic device 100 is designed with a large number of parts and air gaps, the thermal resistance is large, and the heat conduction path between the first shell 21 and the second shell 22 is blocked at the hinge mechanism 23, which deteriorates the heat-dissipating ability of the foldable electronic device 100. On the third hand, the use scenarios of conventional heat dissipation auxiliary materials are limited: the vacuum chamber (VC) heat spreader commonly used in electronic devices cannot cross the hinge mechanism 23 of the foldable electronic device 100, and can only be used to heat the single-side shell (such as the first shell 21) through the VC heat spreader, and the shell with a lower temperature on the other side (such as the second shell 22) cannot be effectively used for heat dissipation. In addition, as the thickness of the foldable electronic device 100 decreases, the heat dissipation space inside the foldable electronic device 100 is compressed to the limit, and large-sized and high-thickness heat dissipation materials cannot be used for heat dissipation and heat dissipation.

[0120] This will cause a large temperature difference between the first shell 21 and the second shell 22, affecting the user's thermal experience, and easily cause a large color difference between the first part 11 and the second part 12 of the folding screen 10, affecting the display effect of the foldable electronic device 100.

[0121] See also Figure 5a , Figure 5a Schematic diagram of temperature simulation of a foldable electronic device 100 in the related art. In the foldable electronic device 100, the heating element 33 is disposed in the first housing 21, and no heat conducting structure is disposed in the foldable electronic device 100. Figure 5aIt can be seen that the foldable electronic device 100 has a thermal fault at the hinge mechanism 23. The highest temperature on the first shell 21 is 49.6999°C, and the highest temperature on the second shell 22 is 37.6622°C. The temperature difference between the highest temperature of the first shell 21 and the highest temperature of the second shell 22 is as high as 12.0377°C, which affects the user experience.

[0122] See also Figure 5b , Figure 5b FIG. 1 is a schematic diagram of temperature simulation of a foldable electronic device 100 in other related technologies. Figure 5a The difference between the foldable electronic device 100 in the embodiment is that, in the embodiment, the first housing 21 includes a first heat-conducting structure, the second housing 22 is provided with a second heat-conducting structure, and the first heat-conducting structure and the second heat-conducting structure are independent of each other. In this way, the first housing 21 can be cooled by the first heat-conducting structure, and the second housing 22 can be cooled by the second heat-conducting structure.

[0123] from Figure 5b It can be seen that the foldable electronic device 100 still has a thermal fault at the hinge mechanism 23. Among them, the highest temperature on the first shell 21 is 42.9107°C. The highest temperature on the second shell 22 is 29.6342°C. The temperature difference between the highest temperature of the first shell 21 and the highest temperature of the second shell 22 is 11.2728°C.

[0124] In order to improve the heat dissipation performance of the foldable electronic device 100, and thereby improve the foldable electronic device and reduce the temperature of the foldable electronic device 100, please refer to Figure 6-Figure 7 , Figure 6 A perspective view of a housing assembly 20 provided in some embodiments of the present application, Figure 7 for Figure 6 The housing assembly 20 and the folding screen 10 are shown as a schematic diagram of assembly. The housing assembly 20 of the foldable electronic device 100 includes a first housing 21, a second housing 22 and a hinge mechanism 23, and also includes a heat conducting sheet 24.

[0125] See also Figure 6-Figure 7 The heat conducting sheet 24 includes a first heat conducting portion 241, a second heat conducting portion 242 and a third heat conducting portion 243. The third heat conducting portion 243 is connected between the first heat conducting portion 241 and the second heat conducting portion 242. The first heat conducting portion 241 is connected to the third heat conducting portion 243 by thermal conduction, and the second heat conducting portion 242 is connected to the third heat conducting portion 243 by thermal conduction. In this way, heat transfer between the first heat conducting portion 241 and the second heat conducting portion 242 can be achieved through the third heat conducting portion 243.

[0126] Specifically, there are many ways to achieve thermal connection between the first heat conducting part 241 and the third heat conducting part 243, for example, the first heat conducting part 241 and the third heat conducting part 243 can be directly connected, or the first heat conducting part 241 and the third heat conducting part 243 can be indirectly connected through other heat conducting structures. The connection method between the second heat conducting part 242 and the third heat conducting part 243 can be the same as the connection method between the first heat conducting part 241 and the second heat conducting part 242.

[0127] In some embodiments, the first heat conducting part 241, the third heat conducting part 243, and the second heat conducting part 242 are an integrally formed structure. That is, the heat conducting sheet 24 is an integrally formed part. In this way, while achieving heat transfer between the first heat conducting part 241 and the second heat conducting part 242, the connection strength between the first heat conducting part 241 and the third heat conducting part 243 and the connection strength between the third heat conducting part 243 and the second heat conducting part 242 can be improved, simplifying the assembly process of the heat conducting sheet 24.

[0128] It is understandable that in other embodiments, the first heat conducting part 241 and the third heat conducting part 243 can be set as a molded structure, or the second heat conducting part 242 and the third heat conducting part 243 can be set as an integrally molded structure, or the first heat conducting part 241, the second heat conducting part 242, and the third heat conducting part 243 can be set as separate parts.

[0129] See also Figure 7 , the first heat conducting part 241 is located on the side of the first shell 21 facing the folding screen 10. The first heat conducting part 241 is thermally connected to the first shell 21. Specifically, the first heat conducting part 241 can be fixedly connected to the first shell 21. Exemplarily, the first heat conducting part 241 can be fixedly connected to the first shell 21 by gluing, clamping, screw connection, etc. In this way, heat transfer can be achieved between the first shell 21 and the first heat conducting part 241.

[0130] The second heat conducting part 242 is located on the side of the second housing 22 facing the folding screen 10. The second heat conducting part 242 is thermally connected to the second housing 22. In this way, heat transfer can be achieved between the second housing 22 and the second heat conducting part 242.

[0131] The second heat conducting portion 242 may be connected to the second housing 22 in the same manner as the first housing 21 is connected to the first housing 21 .

[0132] In some embodiments, see Figure 6The first housing 21 has a first fixing surface 211a, and the first fixing surface 211a is formed on a side surface of the first middle frame 211 away from the first back cover 212. The second housing 22 has a second fixing surface 221a. The second fixing surface 221a is formed on a side surface of the second middle frame 221 away from the second back cover 222. The first heat conducting portion 241 can be fixedly connected to the first fixing surface 211a, and the second heat conducting portion 242 can be fixedly connected to the second fixing surface 221a.

[0133] See also Figure 6 , the third heat-conducting part 243 is arranged opposite to the rotating shaft mechanism 23. The third heat-conducting part 243 can be bent together with the folding screen 10. At least the third heat-conducting part 243 of the heat-conducting sheet 24 is made of a flexible material. The first heat-conducting part 241 and the second heat-conducting part 242 can be made of a flexible material, or a rigid material, or partially made of a rigid material and partially made of a flexible material, which is not specifically limited here. In this way, when the first shell 21 rotates relative to the second shell 22 between the unfolded position and the folded position, the third heat-conducting part 243 can bend with the relative rotation between the first shell 21 and the second shell 22. In this way, the folding performance of the foldable electronic device 100 can be guaranteed, so that the foldable electronic device 100 can be switched between the unfolded state and the folded state.

[0134] See also Figure 7 , the third heat conducting part 243 is arranged between the third part 13 of the folding screen 10 and the hinge mechanism 23. That is, the third heat conducting part 243 is arranged across the hinge mechanism 23. In this way, it is possible to avoid the third heat conducting part 243 occupying the internal space of the hinge mechanism 23, thereby facilitating the reduction of the thickness of the hinge mechanism 23 and the thickness of the foldable electronic device 100, and facilitating the realization of a lightweight design of the foldable electronic device 100.

[0135] In this embodiment, the heat on the first housing 21 can be transferred to the first heat conducting portion 241 of the heat conducting sheet 24, and then transferred to the second heat conducting portion 242 via the third heat conducting portion 243. In this way, the first housing 21 and the second housing 22 can achieve heat transfer through the heat conducting sheet 24, which can improve the heat distribution capacity of the foldable electronic device 100, thereby reducing the temperature difference between the first housing 21 and the second housing 22, avoiding the local temperature of the first housing 21 or the second housing 22 from being too high, avoiding the occurrence of local hot spots in the foldable electronic device 100, and helping to reduce the color difference between the first part 11 and the second part 12 of the foldable screen 10, thereby helping to improve the display effect of the foldable electronic device 100 and enhance the user experience.

[0136] In some embodiments, in order to reduce the bending stress of the heat conductive sheet 24, the third heat conductive portion 243 is usually not relatively fixed to the hinge mechanism 23. In this way, when the foldable electronic device 100 is in the folded state or the foldable electronic device 100 switches between the unfolded state and the folded state, the stress on the third heat conductive portion 243 can be reduced, which is conducive to reducing the risk of fracture, fault, etc. of the third heat conductive portion 243, and can reduce the requirements for the fracture elongation of the heat conductive sheet 24, which is conducive to reducing the cost of the heat conductive sheet 24.

[0137] The foldable electronic device 100 and the shell assembly 20 in this embodiment only need to fix the heat conductive sheet 24 to the first shell 21 and the second shell 22 respectively, and there is no need to fix the heat conductive sheet 24 to the hinge mechanism 23. The assembly is simple, and the part of the heat conductive sheet 24 spanning the hinge mechanism 23 (that is, the third heat conductive portion 243) serves as a stretching zone during the bending process of the shell assembly 20. The stress applied to the heat conductive sheet 24 during the bending process is small, which can reduce the requirement for the elongation at break of the heat conductive sheet 24.

[0138] However, the foldable electronic device 100 and the housing assembly 20 in this embodiment also have the following disadvantages: since the third heat conducting part 243 of the heat conducting sheet 24 is not fixed to the hinge mechanism 23, when the foldable electronic device 100 is folded between the unfolded state and the folded state, the third heat conducting part 243 is easy to contact the third part 13 of the foldable screen 10, and there is a risk of the screen being pushed up. Moreover, after repeated bending, the third heat conducting part 243 has poor flatness, and the third part 13 of the foldable screen 10 cannot be effectively supported by the third heat conducting part 243, which affects the screen light and shadow and is not conducive to optimizing the folding of the foldable screen 10. In addition, in order to avoid the reverse arch phenomenon after the third part 13 of the foldable screen 10 is bent multiple times, in some designs, the third part 13 of the foldable screen 10 is fixed with glue. On this basis, in order to ensure the bendability of the third heat conducting part 243, the glue spot between the foldable screen 10 and the hinge mechanism 23 is set apart from the third heat conducting part 243. In this way, the third heat conducting portion 243 is arranged in the length direction of the rotating shaft mechanism 23 (that is, Figure 6 The size in the Y-axis direction) will be affected by the above-mentioned glue spot position, and the gaps between the components of the hinge mechanism 23 cannot be covered by the heat conductive sheet 24, so that the part of the folding screen 10 opposite to the gap cannot be effectively supported, further affecting the screen light and shadow, making the folding screen 10 prone to creases, resulting in a low user experience of the foldable electronic device 100.

[0139] In order to take into account both the heat dissipation performance of the foldable electronic device 100 and the folding mark of the folding screen 10, please refer to Figure 8-Figure 9 , Figure 8 A perspective view of a housing assembly 20 provided in some embodiments of the present application, Fig. 9 for Figure 8 The exploded view of the housing assembly 20 is shown. The housing assembly 20 includes a first housing 21 , a second housing 22 , a rotating shaft mechanism 23 and a heat conducting sheet 24 , and also includes a supporting sheet 25 .

[0140] The support sheet 25 is in sheet shape. Fig. 9 The support sheet 25 includes a first surface 25a and a second surface 25b opposite to each other. The first surface 25a faces away from the hinge mechanism 23, and the second surface 25b faces the hinge mechanism 23. Specifically, when the hinge mechanism 23 is in the unfolded state, the support sheet 25 is stacked on the hinge mechanism 23, and the third part 13 of the folding screen 10 can be supported on the first surface 25a of the support sheet 25. That is, the support sheet 25 is located between the folding screen 10 and the third heat conducting part 243.

[0141] In this way, the third part 13 of the folding screen 10 can be separated from the third heat conducting part 243 of the heat conducting sheet 24 by the support sheet 25, so as to avoid direct contact between the third heat conducting part 243 of the heat conducting sheet 24 and the third part 13 of the folding screen 10, thereby preventing the third heat conducting part 243 from hitting the screen during the folding process of the foldable electronic device 100, thereby improving the reliability of the folding screen 10. At the same time, when the foldable electronic device 100 is in the unfolded state, the third part 13 of the folding screen 10 can be effectively supported by the first surface 25a of the support sheet 25, thereby improving the flatness of the folding screen 10 in the unfolded state, and helping to reduce screen light and shadow and optimize the folding marks of the folding screen 10.

[0142] The specific structure of the housing assembly 20 in the embodiment of the present application is described in detail below.

[0143] See also Fig.10 , Fig.10 for Figure 8 The three-dimensional diagram of the rotating shaft mechanism 23 in the housing assembly 20 is shown. Fig.10 The rotating shaft mechanism 23 is shown in an unfolded state. The rotating shaft mechanism 23 includes a base 230, a first rotating door plate 231, a second rotating door plate 232 and an intermediate door plate 233. It can be understood that Fig.10 The schematic diagram shows some components of the rotating shaft mechanism 23. The actual shape, size, position and structure of these components are not limited to Fig.10 For example, in some other embodiments, the rotating shaft mechanism 23 may not include the middle door plate 233. For another example, in some other embodiments, the rotating shaft mechanism may further include a plurality of middle door plates 233.

[0144] The base 230 includes a bottom plate 2301 and a side panel 2302. The side panel 2302 surrounds the outer edge of the bottom plate 2301, and a storage space is defined between the side panel 2302 and the bottom plate 2301. At least part of the components of the hinge mechanism 23 are stored in the storage space. In this way, the components of the hinge mechanism 23 can be hidden inside the base 230, which can improve the appearance of the folding screen 10 device.

[0145] The first rotating door plate 231 and the second rotating door plate 232 are rotatably connected to opposite sides of the base 230 to support the rotation shaft mechanism 23 to switch between the unfolded state and the folded state. Fig.10 The first rotating door plate 231 is rotatably connected to the base 230 in the width direction ( Fig.10 The first rotating door panel 231 and the second rotating door panel 232 are rotatably connected to one side of the base 230 in the width direction. The first rotating door panel 231 and the second rotating door panel 232 can be rotatably connected to the base 230 through a rotating shaft, a swing arm, a hinge, etc., which is not specifically limited in the embodiment of the present application.

[0146] See also Fig.10 The middle door plate 233 is disposed on the base 230 and is located between the first rotating door plate 231 and the second rotating door plate 232. The first rotating door plate 231 and the second rotating door plate 232 can both rotate relative to the middle door plate 233.

[0147] See also Fig. 9 , the first housing 21 can be connected to the first rotating door plate 231. Exemplarily, the first housing 21 can be connected to the first rotating door plate 231 by means of the first middle frame 211. In some embodiments, the first housing 21 and the first rotating door plate 231 can be fixedly connected, or the first housing 21 can also be slidably connected to the first rotating door plate 231. The second housing 22 is connected to the second rotating door plate 232. The connection method between the second housing 22 and the second rotating door plate 232 can be designed with reference to the connection method between the first housing 21 and the first rotating door plate 231. In this way, when the first housing 21 rotates between the unfolded position and the folded position, the first rotating door plate 231 can be driven to rotate relative to the base 230, and when the second housing 22 rotates between the unfolded position and the folded position, the second rotating door plate 232 can be driven to rotate relative to the base 230, thereby realizing the switching of the foldable electronic device 100 between the unfolded state and the folded state.

[0148] See also Fig.10The first rotating door plate 231, the second rotating door plate 232 and the middle door plate 233 are all in plate shape. The first rotating door plate 231 includes a first supporting surface 2311, and the first rotating door plate 231 can support part of the supporting sheet 25 by means of the first supporting surface 2311. The second rotating door plate 232 includes a second supporting surface 2321, and the second rotating door plate 232 can support part of the supporting sheet 25 by means of the second supporting surface 2321. The middle door plate 233 includes a third supporting surface 2331, and the middle door plate 233 can support part of the supporting sheet 25 by means of the third supporting surface 2331.

[0149] Fig.10 The rotating shaft mechanism 23 is shown in an unfolded state. In this state, the first support surface 2311, the second support surface 2321 and the third support surface 2331 are oriented in the same direction, and the first support surface 2311, the second support surface 2321 and the third support surface 2331 are arranged approximately in the same plane. That is, the angle between the first support surface 2311 and the third support surface 2331 is approximately 180°, and the angle between the second support surface 2321 and the third support surface 2331 is also approximately 180°. In this way, the support sheet 25 supported on the first support surface 2311, the second support surface 2321 and the third support surface 2331 can be in a flattened state, thereby ensuring the flatness of the third part 13 of the folding screen 10 when the foldable electronic device 100 is in an unfolded state, which is conducive to reducing the crease of the folding screen 10.

[0150] It can be understood that when the hinge mechanism 23 is in the unfolded state, the shell assembly 20 and the foldable electronic device 100 including the shell assembly 20 are also in the unfolded state, the angle between the first shell 21 and the second shell 22 is approximately 180°, and the angle between the first part 11 and the second part 12 of the folding screen 10 is also approximately 180°.

[0151] Please continue reading Fig.10 The first rotating door plate 231 includes a first inner side surface 2313 and a first outer side surface 2314 opposite to each other. When the rotating shaft mechanism 23 is in the unfolded state, the first inner side surface 2313 faces the second rotating door plate 232. The first rotating door plate 231 also includes a first bottom surface 2312 opposite to the first supporting surface 2311. The first supporting surface 2311 is provided with a first sinking groove 231a which is recessed toward the first bottom surface 2312. The first sinking groove 231a is used to accommodate a part of the third heat conducting portion 243.

[0152] The second rotating door plate 232 includes a second inner side surface 2323 and a second outer side surface 2324 opposite to each other. When the rotating shaft mechanism 23 is in the unfolded state, the second inner side surface 2323 faces the first rotating door plate 231. The second rotating door plate 232 also includes a second bottom surface 2322 opposite to the second supporting surface 2321. The first supporting surface 2311 is provided with a second sinking groove 232a which is recessed toward the second bottom surface 2322. The second sinking groove 232a is used to accommodate a part of the third heat conducting portion 243.

[0153] The middle door plate 233 includes a first side wall surface 2333 and a second side wall surface 2334 opposite to each other. When the hinge mechanism 23 is in the unfolded state, the first side wall surface 2333 faces the first rotating door plate 231, and the second side wall surface 2334 faces the second rotating door plate 232. The middle door plate 233 also includes a third bottom surface 2332 opposite to the third supporting surface 2331. The third supporting surface 2331 is provided with a third sinking groove 233a which is recessed toward the third bottom surface 2332, and the third sinking groove 233a is used to accommodate a part of the third heat conducting portion 243.

[0154] In some embodiments, see Fig.10 When the hinge mechanism 23 is in the unfolded state, there is a first gap K1 between the middle door panel 233 and the first rotating door panel 231, and there is a second gap K2 between the middle door panel 233 and the second rotating door panel 232. In this way, when the first rotating door panel 231 and the second rotating door panel 232 rotate between the unfolded position and the folded position, collision, friction or even jamming between the first rotating door panel 231 and the middle door panel 233, and between the second rotating door panel 232 and the middle door panel 233 can be avoided, thereby improving the reliability of the hinge mechanism 23.

[0155] See also Fig.11 , Fig.11 for Fig.10 Schematic diagram of the rotating shaft mechanism 23 in the folded state. When the rotating shaft mechanism 23 is in the folded state, the bending shape of the third part 13 of the folding screen 10 can be limited by the first rotating door plate 231, the middle door plate 233 and the second rotating door plate 232. Fig.11 As shown, the first rotating door panel 231 and the second rotating door panel 232 are in the folded position, the first support surface 2311 and the second support surface 2321 are arranged opposite to each other, and the first support surface 2311 and the second support surface 2321 are arranged obliquely or vertically relative to the third support surface 2331. The first support surface 2311 and the second support surface 2321 are arranged opposite to each other, which means that the first support surface 2311 and the second support surface 2321 face each other, so that the third part 13 of the folding screen 10 arranged opposite to the rotating shaft mechanism 23 is also in the folded state.

[0156] It can be understood that when the hinge mechanism 23 is in a folded state, the shell assembly 20 including the hinge mechanism 23 and the foldable electronic device 100 including the shell assembly 20 are also in a folded state, the angle between the first shell 21 and the second shell 22 is approximately 0°, and the angle between the first part 11 of the folding screen 10 and the second part 12 of the folding screen 10 is also approximately 0°.

[0157] For some examples, see Fig.11 The first rotating door panel 231 and the second rotating door panel 232 rotate from the unfolded position to the folded position at angles θ1 and θ2 respectively. Fig.11 In the embodiment shown, the rotation angles θ1 and θ2 are both greater than 90°. In this way, the third portion 13 of the folding screen 10 can be folded into a teardrop shape. In some other embodiments, the rotation angles θ1 and θ2 can also be less than or equal to 90° to fold the third portion 13 of the folding screen 10 into other shapes, which is not specifically limited in the embodiment of the present application.

[0158] Among them, the first rotating door panel 231 and the middle door panel 233, as well as the second rotating door panel 232 and the middle door panel 233 can be directly rotatably connected by means of a rotating shaft, or can be rotatably connected by means of an intermediate transmission mechanism such as a hinge mechanism and a four-bar mechanism, or can be rotatably connected by means of soft materials such as leather and cloth, and no specific limitation is made here.

[0159] See also Fig.12 , Fig.12 for Fig.10 The schematic diagram of the assembly of the hinge mechanism 23 and the support sheet 25 is shown. When the hinge mechanism 23 is in the unfolded state, the support sheet 25 is stacked on the first support surface 2311, the second support surface 2321 and the third support surface 2331. That is, the support sheet 25 is laid flat on the first support surface 2311, the second support surface 2321 and the third support surface 2331. The first surface 25a of the support sheet 25 is roughly parallel to the first support surface 2311, the second support surface 2321 and the third support surface 2331. In this way, the support sheet 25 can remain flat when the hinge mechanism 23 is in the unfolded state, thereby improving the flatness of the third part 13 of the folding screen 10 in the unfolded state, which is beneficial to reduce the screen light and shadow and optimize the crease of the screen folding screen 10.

[0160] For details, please refer to Fig.13 , Fig.13 for Fig.12The assembly schematic diagram shown is a cross-sectional view at line BB. The support sheet 25 can be supported on the pivot mechanism 23 by means of the second surface 25b. Specifically, when the pivot mechanism 23 is in the expanded state, a portion of the support sheet 25 is opposite to the first gap K1, and a portion of the support sheet 25 is opposite to the second gap K2. In this way, when the pivot mechanism 23 is in the expanded state, the support sheet 25 can span across the first gap K1 and the second gap K2. That is, when the pivot mechanism 23 is in the expanded state, the support sheet 25 can cover the first gap K1 and the second gap K2. Therefore, when the shell assembly 20 is applied to the foldable electronic device 100, the hinge mechanism 23 can support the parts of the folding screen 10 opposite to the first gap K1 and the second gap K2 with the help of the support sheet 25, so as to improve the supporting performance of the hinge mechanism 23, thereby improving the impact resistance of the folding screen 10, avoiding the appearance of bright spots on the folding screen 10, and improving the flatness of the folding screen 10 in the unfolded state, which is beneficial to reduce the light and shadow of the screen and reduce the creases that appear on the folding screen 10 during the folding process.

[0161] For details, please refer to Fig.13 The support sheet 25 includes a first support portion 251, a second support portion 252 and a third support portion 253, and the third support portion 253 is connected between the first support portion 251 and the second support portion 252. When the shaft mechanism 23 is in the unfolded state, the first support portion 251 is arranged opposite to the first rotating door plate 231, and the second support portion 252 is arranged opposite to the second rotating door plate 232. A part of the third support portion 253 covers the first gap K1, a part of the third support portion 253 covers the second gap K2, and a part of the third support portion 253 is arranged opposite to the middle door plate 233.

[0162] See also Fig.14 , Fig.14 for Fig.10 The schematic diagram of the rotating shaft mechanism 23 and the supporting sheet 25 in the folded state is shown. When the rotating shaft mechanism 23 is in the folded state, the supporting sheet 25 is bent. In this way, when the first rotating door plate 231 and the second rotating door plate 232 rotate between the unfolded position and the folded position relative to the base 230, the supporting sheet 25 can be bent together with the folding screen 10, so as to avoid the supporting sheet 25 affecting the bending effect of the folding screen 10.

[0163] In order to facilitate the support sheet 25 to be bent together with the folding screen 10, in some embodiments, when the shell assembly 20 switches between the unfolded state and the folded state, the support sheet 25 can at least partially slide relative to the hinge mechanism 23.

[0164] In some embodiments, see Fig.13 and Fig.14, the first support portion 251 is connected to the first rotating door plate 231. The first support portion 251 can be fixedly connected to the first rotating door plate 231 by means of a first adhesive structure 60. The first adhesive structure 60 includes but is not limited to double-sided adhesive, hot melt adhesive, etc. The first adhesive structure 60 can be arranged on opposite sides of the first sink 231a. In this way, the connection area between the support sheet 25 and the first rotating door plate 231 can be increased, thereby improving the connection reliability between the support sheet 25 and the first rotating door plate 231.

[0165] It is understood that in some other embodiments, the first support portion 251 may also be fixedly connected to the first rotating door panel 231 by means of a screw, a buckle or other structures, or the first support portion 251 may also be rotatably connected to the first rotating door panel 231 by means of a rotating shaft, a flexible structure or the like, which is not specifically limited here. The second support portion 252 is slidably connected to the second rotating door panel 232. That is, when the rotating shaft mechanism 23 is folded between the unfolded state and the folded state, the second support portion 252 can slide relative to the second rotating door panel 232.

[0166] See also Fig.15 , Fig.15 for Fig.13 The schematic diagram of the structure of the first rotating door plate 231 and the second rotating door plate 232 in the rotating shaft mechanism 23 is shown when they rotate relative to each other. When the rotating shaft mechanism 23 rotates from the unfolded state to the folded state along the r1 direction, the second supporting portion 252 of the supporting sheet 25 contacts the second rotating door plate 232 and slides relative to the second rotating door plate 232 along the direction e1. When the rotating shaft mechanism 23 rotates from the folded state to the unfolded state along the r2 direction, the second supporting portion 252 of the supporting sheet 25 contacts the second rotating door plate 232 and slides relative to the second rotating door plate 232 along the direction e2. In this way, when the rotating shaft mechanism 23 is folded between the unfolded state and the folded state, the supporting sheet 25 can adapt to the change in the gap between the first rotating door plate 231 and the second rotating door plate 232, which can reduce the stress received by the folding screen 10 and ensure the flatness of the supporting sheet 25. Therefore, when the third part 13 of the folding screen 10 is supported on the supporting sheet 25, the flatness of the third part 13 can be improved.

[0167] On this basis, in order to improve the wear resistance of the housing assembly 20 and reduce the noise generated by the support sheet 25 rubbing against the second support surface 2321 during the folding process of the rotating shaft mechanism 23, please refer to Figure 13-Figure 15 The shaft mechanism 23 further includes a lubricating structure 70. The lubricating structure 70 is at least disposed between the support sheet 25 and the shaft mechanism 23. Specifically, the lubricating structure 70 may be disposed between the second support portion 252 and the second support surface 2321, and between the third support portion 253 and the third support surface 2331.

[0168] In some embodiments, the lubrication structure 70 may be a surface-slip structure, and the friction coefficient of the lubrication structure 70 is less than the friction coefficient of the second support surface 2321. Specifically, the lubrication structure 70 may be a structure having a surface friction coefficient less than 0.25. Exemplarily, the surface friction coefficient of the lubrication structure 70 may be 0.24, 0.23, 0.2, 0.1, 0.05, 0.02 or 0.01, etc. On this basis, the material of the lubrication structure 70 includes but is not limited to compounds containing fluorine elements. Exemplarily, the material of the lubrication structure 70 is polytetrafluoroethylene (also known as Teflon). In other embodiments, the material of the lubrication structure 70 may also be polyoxymethylene (POM). In yet other embodiments, the lubrication structure 70 may also be a Mylar sheet. In this way, the friction coefficient between the support sheet 25 and the second support surface 2321 can be reduced, the wear resistance of the housing assembly 20 can be improved, and the noise generated by the scratching between the support sheet 25 and the rotating shaft mechanism 23 can be reduced, thereby improving the user experience of the foldable electronic device 100.

[0169] There are many locations where the lubrication structure 70 can be disposed. Figure 13-Figure 15 , the lubrication structure 70 is disposed on the second support surface 2321. The lubrication structure 70 can be disposed on a portion of the surface of the second support surface 2321, or on the entire surface of the second support surface 2321. Exemplarily, the lubrication structure 70 can be formed on the second support surface 2321 by spraying, curtain coating, electrochemical deposition, electroplating, etc., or the lubrication structure 70 can be bonded to the second support surface 2321, which is not specifically limited here.

[0170] In other embodiments, the lubrication structure 70 may also be provided on the second surface 25b of the support sheet 25. Specifically, the lubrication structure 70 may be provided on the second surface 25b corresponding to the second support portion 252 of the support sheet 25. The lubrication structure 70 may be provided in a partial area of ​​the second surface 25b corresponding to the second support portion 252, or may be provided in the entire area of ​​the second surface 25b corresponding to the second support portion 252. Moreover, in addition to being provided on the second surface 25b corresponding to the second support portion 252, the lubrication structure 70 may also be provided in other areas of the second surface 25b. In this way, the wear resistance of the housing assembly 20 can be further improved, and the noise generated by the rotating shaft mechanism 23 during the folding process can be further reduced.

[0171] In other embodiments, a lubricating structure 70 may be provided on the second surface 25 b of the support sheet 25 and at the same time, a lubricating structure 70 may be provided on the second support surface 2321 .

[0172] exist Fig.13In the illustrated embodiment, one end of the support sheet 25 is fixed relative to the rotating shaft mechanism 23, and the other end is slidably connected to the rotating shaft mechanism 23. In other embodiments, the middle portion of the support sheet 25 may be fixed to the rotating shaft mechanism 23, and both ends of the support sheet 25 may be slidably connected to the rotating shaft mechanism 23. For example, the third support portion 253 of the support sheet 25 may be fixedly connected to the middle door panel 233, the first support portion 251 may be slidably connected to the first rotating door panel 231, and the second support portion 252 may be slidably connected to the second rotating door panel 232. Of course, in other embodiments, both ends of the support sheet 25 may also be fixedly connected to the rotating shaft mechanism 23.

[0173] In addition, Fig.13 In the embodiment shown, there is one support sheet 25, and in other embodiments, there may be two support sheets 25. In this case, the first gap K1 can be covered by one of the support sheets 25, and the second gap K2 can be covered by the other support sheet 25. In this case, one end of one of the support sheets 25 can be fixedly connected to the first rotating door panel 231, and the other end can be slidably connected to the middle door panel 233. One end of the other support sheet 25 can be fixedly connected to the second rotating door panel 232, and the other end can be slidably connected to the middle door panel 233. As long as it can be ensured that when the rotating shaft mechanism 23 is directly folded in the unfolded state and the folded state, at least part of the support sheet 25 can slide relative to the rotating shaft mechanism 23.

[0174] See also Fig.16 , Fig.16 for Fig.12 The assembly schematic diagram shown is a cross-sectional view at line CC. An accommodating space 80 is defined between the support sheet 25 and the rotating shaft mechanism 23. The accommodating space 80 is used to accommodate at least a portion of the structure of the third heat-conducting portion 243 of the heat-conducting sheet 24. In other words, at least a portion of the third heat-conducting portion 243 can be located in the accommodating space 80. In this embodiment, the accommodating space 80 is defined between the support sheet 25 and the first rotating door panel 231, the second rotating door panel 232, and the middle door panel 233.

[0175] For details, please refer to Fig.16 , a first accommodating groove 81 is defined between the first sinking groove 231a and the supporting sheet 25, a second accommodating groove 82 is defined between the second sinking groove 232a and the supporting sheet 25, and a third accommodating groove 83 is defined between the third sinking groove 233a and the supporting sheet 25. The accommodating space 80 may include the first accommodating groove 81, the second accommodating groove 82 and the third accommodating groove 83 mentioned above. In this way, while ensuring the contact area between the rotating shaft mechanism 23 and the supporting sheet 25, the overlapping dimensions of the rotating shaft mechanism 23, the third heat conducting portion 243 and the supporting sheet 25 in the thickness direction of the rotating shaft mechanism 23 can be reduced, which is conducive to reducing the overall thickness of the housing assembly 20, and further conducive to realizing the thin design of the foldable electronic device 100.

[0176] See also Fig.17 , Fig.17 for Figure 8 The third heat conducting portion 243 includes a first section 2431, a second section 2432 and a third section 2433. The third section 2433 is connected between the first section 2431 and the second section 2432. The third heat conducting portion 243 can be connected to the first heat conducting portion 241 by means of the first section 2431, and connected to the second heat conducting portion 242 by means of the second section 2432. The first section 2431 of the third heat conducting portion 243 is located in the first receiving groove 81, the second section 2432 is located in the second receiving groove 82, and the third section 2433 is located in the third receiving groove 83.

[0177] In some embodiments, see Fig.17 In order to reduce the scratch between the support sheet 25 and the third heat conducting portion 243 , the support sheet 25 and the third heat conducting portion 243 are spaced apart from each other.

[0178] See also Fig.18 , Fig.18 for Fig.17 The schematic diagram of the assembly of the housing assembly 20 and the folding screen 10 is shown. The support sheet 25 is located between the third part 13 of the folding screen 10 and the third heat conducting part 243 of the heat conducting sheet 24. The third part 13 of the folding screen 10 is supported on the first surface 25a of the support sheet 25. In this way, the housing assembly 20 can separate the third part 13 of the folding screen 10 from the third heat conducting part 243 of the heat conducting sheet 24 with the help of the support sheet 25, so as to avoid direct contact between the third heat conducting part 243 of the heat conducting sheet 24 and the third part 13 of the folding screen 10, thereby preventing the third heat conducting part 243 from hitting the screen during the folding process of the foldable electronic device 100, and improving the reliability of the folding screen 10. At the same time, when the foldable electronic device 100 is in the unfolded state, the third part 13 of the folding screen 10 can be effectively supported by the first surface 25a of the support sheet 25, which can improve the flatness of the folding screen 10 in the unfolded state, and is conducive to reducing the light and shadow of the screen and optimizing the screen crease.

[0179] In some embodiments, see Fig.18 When the foldable electronic device 100 is in the unfolded state, the third portion 13 of the foldable screen 10 is in contact with the first surface 25a of the support sheet 25. In this way, the flatness of the foldable screen 10 in the unfolded state can be further improved, and the crease of the screen 10a can be further optimized.

[0180] On the basis of any of the above embodiments, in order to ensure the supporting strength and supporting performance of the supporting sheet 25 , the elastic modulus of the supporting sheet 25 is greater than the elastic modulus of the third heat conducting portion 243 .

[0181] In some embodiments, the material of the support sheet 25 includes, but is not limited to, metals such as steel and titanium alloy, and composite materials containing fiber materials such as glass fiber, carbon fiber, and aramid fiber. Exemplarily, the support sheet 25 is a metal sheet or a carbon fiber sheet. Among them, steel is an iron-carbon alloy with a carbon content of between 0.02% and 2.11% by mass. These materials have a large elastic modulus and excellent structural strength. While ensuring the supporting strength of the support sheet 25, it is beneficial to reduce the thickness of the support sheet 25, so as to facilitate the thinning of the folding screen 10 device. At the same time, these materials are elastoplastic materials. When the support sheet 25 is in sheet form, the support sheet 25 is elastic, and the support sheet 25 can be bent together with the folding screen 10.

[0182] In some embodiments, the thickness of the support sheet 25 may be greater than or equal to 0.02 millimeters (mm) and less than or equal to 0.10 mm. Specifically, the thickness of the support sheet 25 may be 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm. In this way, the thickness of the support sheet 25 is moderate, and while ensuring the structural strength of the support sheet 25, the thickness of the hinge mechanism 23 in the Z-axis direction can also be taken into account, which is conducive to realizing the thin design of the foldable electronic device 100 in the unfolded state or the folded state.

[0183] It should be noted that the thickness of the support sheet 25 described in the embodiment of the present application refers to the distance between the first surface 25 a and the second surface 25 b of the support sheet 25 .

[0184] In some embodiments, in order to prevent the support sheet 25 from scratching the folding screen 10 during the bending process, a Mylar sheet may be provided on the first surface 25 a of the support sheet 25 .

[0185] In some embodiments, in order to reduce the stress on the third heat conducting part 243 during the folding process of the rotating shaft mechanism 23, when the rotating shaft mechanism 23 switches between the folded state and the unfolded state, the third heat conducting part 243 can slide relative to the rotating shaft mechanism 23. That is, the third heat conducting part 243 and the rotating shaft mechanism 23 are not relatively fixed. In this way, during the bending process of the rotating shaft mechanism 23, the entire third heat conducting part 243 can be used as a stretching zone, which can reduce the tensile force on the third heat conducting part 243 during the bending process, thereby reducing the requirements for the elongation at break of the heat conducting sheet 24, which is conducive to reducing the requirements for the elongation at break of the heat conducting sheet 24, and further reducing the material cost while ensuring the reliability of the heat conducting sheet 24. In addition, the structure is easy to assemble and has high assembly efficiency.

[0186] In this example, see Fig.18When the rotating shaft mechanism 23 is in the unfolded state (that is, when the housing assembly 20 is in the unfolded state), the third section 2433 of the third heat conducting portion 243 is substantially parallel to the first surface 25a of the supporting sheet 25. That is, the size of the third section 2433 is not redundant. In this way, during the folding process of the rotating shaft mechanism 23, the third section 2433 can be prevented from being sandwiched in the gap of the rotating shaft mechanism 23 (such as the gap between the first rotating door panel 231 and the middle door panel 233 and the gap between the second rotating door panel 232 and the middle door panel 233).

[0187] For further information, please refer to Fig.18 , when the rotating shaft mechanism 23 is in the unfolded state, the first section 2431, the second section 2432 and the third section 2433 are all substantially parallel to the first surface 25a. The third heat conducting part 243 is in the shape of a flat plate. That is, the size of the entire third heat conducting part 243 is non-redundant. In this way, during the folding process of the rotating shaft mechanism 23, the third heat conducting part 243 can be prevented from being clamped in the gap of the rotating shaft mechanism 23. In addition, the non-redundant design of the third heat conducting part 243 can reduce the space occupied by the third heat conducting part 243 in the thickness direction of the rotating shaft mechanism 23, and is also conducive to reducing the size of the accommodating space 80 in the thickness direction of the rotating shaft mechanism 23, thereby helping to reduce the size of the first sink 231a, the second sink 232a, and the third sink 233a in the thickness direction of the rotating shaft mechanism 23, and can ensure the structural reliability of the rotating shaft mechanism 23 while reducing the thickness of the rotating shaft mechanism 23.

[0188] It can be understood that in other embodiments, when the hinge mechanism 23 is in the expanded state, only the first section 2431 can be set to be parallel to the first support surface 2311, or only the second section 2432 can be set to be parallel to the second support surface 2321, or the first section 2431 can be set to be parallel to the first support surface 2311 while the second section 2432 can be set to be parallel to the second support surface 2321.

[0189] In some embodiments, see Figure 17-Figure 18 The first sink 231a includes a first bottom wall surface 231a1, and the orientation of the first bottom wall surface 231a1 is the same as the orientation of the first support surface 2311. The second sink 232a includes a second bottom wall surface 232a1, and the orientation of the second bottom wall surface 232a1 is the same as the orientation of the second support surface 2321. The third sink 233a includes a third bottom wall surface 233a1, and the orientation of the third bottom wall surface 233a1 is the same as the orientation of the third support surface 2331.

[0190] When the hinge mechanism 23 is in the unfolded state, the first section 2431 is supported on the first bottom wall surface 231a1, the second section 2432 is supported on the second bottom wall surface 232a1, and the third section 2433 is supported on the third bottom wall surface 233a1. In this way, the third heat conducting part 243 can remain flat when the hinge mechanism 23 is in the unfolded state, which is helpful to avoid the third heat conducting part 243 from arching, thereby helping to reduce the force of the third heat conducting part 243 acting on the folding screen 10.

[0191] In some embodiments, please refer back to Fig.10 , the first sinking groove 231a passes through the first inner side surface 2313 and the first outer side surface 2314. Specifically, one end of the first bottom wall surface 231a1 extends to be flush with the first inner side surface 2313, and the other end extends to be flush with the first outer side surface 2314. In this way, it is convenient to assemble the first section 2431 in the first sinking groove 231a, which can reduce the difficulty of assembling the first section 2431, and can increase the contact area between the first section 2431 and the first bottom wall surface 231a1, thereby ensuring the flatness of the first section 2431 when the rotating shaft mechanism 23 is in the unfolded state.

[0192] Likewise, the second recessed groove 232 a penetrates the second inner side surface 2323 and the second outer side surface 2324 , and the third recessed groove 233 a penetrates the first side wall surface 2333 and the second side wall surface 2334 .

[0193] Based on the above examples, please continue to refer to Fig.10 , the first bottom wall surface 231a1 is parallel to the first support surface 2311. Since the third heat conducting portion 243 of the heat conducting sheet 24 is a flexible material, the shape of the first bottom wall surface 231a1 will affect the shape of the first section 2431 when the shaft mechanism 23 is in the unfolded state. Therefore, the first bottom wall surface 231a1 is set to be parallel to the first support surface 2311. On the one hand, when the shaft mechanism 23 is in the unfolded state, it can ensure that the first section 2431 is parallel to the first support surface 2311, so that the size of the first section 2431 can be designed without redundancy. During the folding process of the shaft mechanism, it is helpful to avoid the first section 2431 being clamped in the gap of the shaft mechanism 23. On the other hand, it is helpful to reduce the size of the first sink 231a in the thickness direction of the shaft mechanism 23, which is helpful to improve the structural strength of the shaft mechanism 23. On the other hand, it is helpful to reduce the step difference between the first heat conducting portion 241 and the first section 2431 , thereby helping to reduce the bending stress of the heat conducting sheet 24 when the rotating shaft mechanism 23 is in the unfolded state.

[0194] Based on similar reasons, the second bottom wall surface 232a1 is parallel to the second supporting surface 2321. The third bottom wall surface 233a1 is parallel to the third supporting surface 2331.

[0195] In some embodiments, in order to enable the third heat conducting portion 243 to be in a flat plate shape when the hinge mechanism 23 is in the unfolded state, the first bottom wall surface 231 a 1 , the second bottom wall surface 232 a 1 , and the third bottom wall surface 233 a 1 are arranged in the same plane.

[0196] It should be noted that the "coplanar" in the embodiments of the present application should be understood in a broad sense. Specifically, "coplanar" includes the situation where multiple surfaces are located in the same plane, and also includes the situation where the step difference between two planes is within a certain error range. For example, if the step difference between two planes is within the range of ±0.2mm, the two planes can be regarded as coplanar.

[0197] It is understandable that in other embodiments, only the first bottom wall surface 231a1 and the third bottom wall surface 233a1 may be arranged coplanarly. Alternatively, only the second bottom wall surface 232a1 and the third bottom wall surface 233a1 may be arranged coplanarly.

[0198] In some embodiments, in order to reduce the step difference between the first heat conducting portion 241 and the first section 2431, please refer to Figure 17-Figure 18 The first fixing surface 211a of the first housing 21 is coplanar with the first bottom wall surface 231a1. Thus, when the rotating shaft mechanism 23 is in the unfolded state, the first heat conducting portion 241 and the first section 2431 can be transitioned through a straight line, thereby avoiding bending between the first heat conducting portion 241 and the first section 2431.

[0199] Similarly, in order to reduce the step difference between the second heat conducting portion 242 and the second section 2432, please refer to Figure 17-Figure 18 The second fixing surface 221a of the second shell 22 is arranged coplanar with the second bottom wall surface 232a1.

[0200] It can be understood that, in other embodiments, when the rotating shaft mechanism 23 is in the unfolded state, the first section 2431 can also be formed into an arc shape that arches in the direction away from the support sheet 25. Similarly, the second section 2432 and the third section 2433 can also be formed into an arc shape that arches in the direction away from the support sheet 25. The structure of the second sink groove 232a and the structure of the third sink groove 233a can be designed with reference to the structure of the first sink groove 231a. In addition, it should be noted that in the same embodiment, the shapes of the first section 2431, the second section 2432, and the third section 2433 can be the same or different.

[0201] See also Fig.19a , Fig.19a for Fig. 9 The schematic diagram of the laminated structure of the heat conducting sheet 24 in the housing assembly 20 is shown. The heat conducting sheet 24 includes a heat conducting layer 24a, a first protective layer 24b and a second protective layer 24c. It can be understood that Fig.19aThe schematic diagram shows some film layers included in the heat conducting sheet 24. The actual shape and thickness of these film layers are not affected by Fig.19a restrictions.

[0202] Specifically, the heat conducting layer 24a may extend from the first heat conducting portion 241 to the second heat conducting portion 242. That is, the first heat conducting portion 241, the second heat conducting portion 242 and the third heat conducting portion 243 all include the heat conducting layer 24a.

[0203] In some embodiments, the material of the heat-conducting layer 24a is graphite. Graphite has good layer-wise heat conduction performance. Specifically, the thermal conductivity of graphite in the plane extension direction is relatively large, which can reach 1000W / (m*K) to 2000W / (m*K). In this way, the heat on the heat-conducting sheet 24 can be quickly diffused outward along its plane, so that the heat between the first heat-conducting part 241 and the second heat-conducting part 242 can be quickly transferred by means of the third heat-conducting part 243, thereby effectively improving the heat-dissipating capacity of the housing assembly 20.

[0204] Of course, the material of the heat-conducting layer 24a is not limited thereto. In other embodiments, the material of the heat-conducting layer 24a may also be metal, polymer material, etc. As long as the thermal conductivity of the heat-conducting layer 24a is higher than the thermal conductivity of the first shell 21, the second shell 22 and the rotating shaft mechanism 23.

[0205] In some embodiments, in order to improve the reliability of the thermal conductive sheet 24 and prevent the thermal conductive sheet 24 from breaking during the bending process, the elongation at break of the thermal conductive layer 24a is greater than or equal to 3.5%. For example, the elongation at break of the thermal conductive layer 24a can be 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.2%, 4.5%, 4.6%, 4.8%, 5.0%, etc.

[0206] In some embodiments, the thickness of the heat conductive layer 24a may be greater than or equal to 0.04 mm and less than or equal to 0.08 mm. For example, the thickness of the heat conductive layer 24a may be 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, etc. In this way, the overall thickness of the heat conductive sheet 24 can be reduced while ensuring the thermal conductivity of the heat conductive sheet 24, which is conducive to reducing the thickness of the housing assembly 20 and realizing a thin design of the foldable electronic device 100.

[0207] The first protective layer 24b is used to protect the heat-conducting layer 24a. Fig.19aThe heat-conducting layer 24a includes a first surface 24a1 and a second surface 24a2 facing each other. The first surface 24a1 may face the folding screen 10, and the second surface 24a2 may face the hinge mechanism 23. The first protective layer 24b is disposed on the first surface 24a1 of the heat-conducting layer 24a. Specifically, the first protective layer 24b may cover the entire surface of the first surface 24a1. In this way, the first surface 24a1 of the heat-conducting layer 24a can be prevented from being exposed, thereby preventing the heat-conducting layer 24a from being oxidized, and preventing the first surface 24a1 of the heat-conducting layer 24a from being scratched against the supporting sheet 25, thereby extending the service life of the heat-conducting layer 24a.

[0208] In some embodiments, the material of the first protective layer 24b can be polyethylene glycol terephthalate (PET), polytetrafluoroethylene (also known as Teflon) (PTFE), etc. The first protective layer 24b can be formed on the first surface 24a1 of the heat conductive layer 24a by bonding, spraying, etc. In this way, the protective effect of the first protective layer 24b can be ensured, and the material cost of the heat conductive sheet 24 can be reduced.

[0209] In some embodiments, the thickness of the first protective layer 24b is greater than or equal to 0.004 mm and less than or equal to 0.01 mm. For example, the thickness of the first protective layer 24b can be 0.004 mm, 0.005 mm, 0.006 mm, 0.007 mm, 0.008 mm, 0.009 mm, 0.10 mm, etc.

[0210] Please continue reading Fig.19a The second protective layer 24c is disposed on the second surface 24a2 of the heat-conducting layer 24a. The second protective layer 24c may cover the entire surface of the second surface 24a2. In this way, the second surface 24a2 of the heat-conducting layer 24a can be prevented from being exposed, thereby preventing the heat-conducting layer 24a from being oxidized, and preventing the second surface 24a2 of the heat-conducting layer 24a from being scratched against the rotating shaft mechanism 23, thereby extending the service life of the heat-conducting layer 24a.

[0211] In some embodiments, the second protective layer 24c is an adhesive layer. For example, the second protective layer 24c can be hot melt adhesive, double-sided adhesive, etc. In this way, the first heat conducting portion 241 of the heat conducting sheet 24 can be bonded and fixed to the first housing 21 with the help of the second protective layer 24c, and the second heat conducting portion 242 of the heat conducting sheet 24 can be bonded and fixed to the second housing 22 with the help of the second protective layer 24c. In this way, while protecting the heat conducting layer 24a, the connection between the heat conducting sheet 24 and the first housing 21 and the second housing 22 can be achieved, which is conducive to reducing the number of stacked layers of the heat conducting sheet 24, thereby helping to reduce the overall thickness of the heat conducting sheet 24.

[0212] In some embodiments, the thickness of the second protective layer 24c is greater than or equal to 0.008 mm and less than or equal to 0.012 mm. For example, the thickness of the second protective layer 24c can be 0.008 mm, 0.009 mm, 0.01 mm, 0.011 mm, 0.012 mm, etc.

[0213] The third heat conducting portion 243 of the heat conducting sheet 24 is easily scratched against the supporting sheet 25 and the rotating shaft mechanism 23 during the bending process of the foldable electronic device 100. On this basis, in order to improve the wear resistance of the heat conducting sheet 24, please continue to refer to Fig.19a The heat conductive sheet 24 further includes a first wear-resistant layer 24d and a second wear-resistant layer 24e.

[0214] The first wear-resistant layer 24d can be used to reduce the friction between the third heat conducting portion 243 and the support sheet 25. The first wear-resistant layer 24d is disposed on the surface of the first protective layer 24b facing away from the heat conducting layer 24a, and the first wear-resistant layer 24d is disposed on the third heat conducting portion 243 of the heat conducting sheet 24.

[0215] Specifically, when the heat conductive sheet 24 is assembled to the shell assembly 20, the orthographic projection of the first wear-resistant layer 24d on the reference plane does not overlap with the orthographic projection of the first fixed surface 211a on the reference plane, and the orthographic projection of the first wear-resistant layer 24d on the reference plane overlaps with the orthographic projection of the hinge mechanism 23 on the reference plane. Among them, when the hinge mechanism 23 is in the unfolded state, the reference plane is parallel to the first fixed surface 211a. That is, the first wear-resistant layer 24d is provided on the third heat conductive part 243, and the first wear-resistant layer 24d is not provided on the first heat conductive part 241. In this way, when the heat conductive sheet 24 is applied to the foldable electronic device 100, the thickness of the first shell 21 can be reduced, which is conducive to realizing the thin design of the foldable electronic device 100, and the material used for the first wear-resistant layer 24d can be reduced, which is conducive to reducing costs.

[0216] Similarly, in order to reduce the thickness of the second shell 22 and the material of the first wear-resistant layer 24d, the orthographic projection of the first wear-resistant layer 24d on the reference plane does not overlap with the orthographic projection of the second fixing surface 221a on the reference plane. That is, the first wear-resistant layer 24d is not provided on the second heat conducting portion 242.

[0217] In some embodiments, the material of the first wear-resistant layer 24d includes, but is not limited to, polytetrafluoroethylene (also known as Teflon) (polytetrafluoroethylene, PTFE), PET, etc. The thickness of the first wear-resistant layer 24d can be 0.015mm-0.02mm. Exemplarily, the thickness of the first wear-resistant layer 24d can be 0.015mm, 0.016mm, 0.017mm, 0.018mm, 0.019mm, 0.02mm, etc.

[0218] The second wear-resistant layer 24e can be used to reduce the friction between the third heat-conducting part 243 and the rotating shaft mechanism 23. The second wear-resistant layer 24e is arranged on the side surface of the second protective layer 24c away from the heat-conducting layer 24a, and the second wear-resistant layer 24e is arranged on the third heat-conducting part 243 of the heat-conducting sheet 24. Specifically, when the heat-conducting sheet 24 is assembled to the housing assembly 20, the orthographic projection of the second wear-resistant layer 24e on the reference plane does not overlap with the orthographic projection of the first fixed surface 211a on the reference plane, and the orthographic projection of the second wear-resistant layer 24e on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism 23 on the reference plane. That is, the second wear-resistant layer 24e is arranged on the third heat-conducting part 243, and the second wear-resistant layer 24e is not arranged on the first heat-conducting part 241. In this way, when the heat conductive sheet 24 is applied to the foldable electronic device 100, the thickness of the first shell 21 can be reduced, which is conducive to realizing the thin design of the foldable electronic device 100, and can reduce the material used in the second wear-resistant layer 24e, which is conducive to reducing costs.

[0219] Similarly, in order to reduce the thickness of the second shell 22 and the material of the second wear-resistant layer 24e, the orthographic projection of the second wear-resistant layer 24e on the reference plane does not overlap with the orthographic projection of the second fixing surface 221a on the reference plane. That is, the second heat conducting portion 242 is not provided with the second wear-resistant layer 24e.

[0220] When the second protective layer 24c is an adhesive layer, the second wear-resistant layer 24e can be connected to the heat-conducting layer 24a by means of the second protective layer 24c. In this way, the wear resistance of the heat-conducting sheet 24 can be improved while reducing the overlapping dimensions of the heat-conducting sheet 24 and the first shell 21, and the overlapping dimensions of the heat-conducting sheet 24 and the second shell 22.

[0221] The material and thickness of the second wear-resistant layer 24e can be designed with reference to the material and thickness of the first wear-resistant layer 24d, and will not be described in detail here.

[0222] For example, in Fig.19a In the embodiment shown, the material of the heat-conducting layer 24a is graphite, the material of the first protective layer 24b is PET, the material of the second protective layer 24c is an adhesive layer, and the materials of the first wear-resistant layer 24d and the second wear-resistant layer 24e are both PTFE. On this basis, when the thickness of the heat-conducting layer 24a is 0.04 mm, the thickness of the first protective layer 24b is 0.007 mm, the thickness of the second protective layer 24c is 0.01 mm, the thickness of the first wear-resistant layer 24d is 0.016 mm, and the thickness of the second wear-resistant layer 24e is 0.016 mm, the thickness of the portion of the heat-conducting sheet 24 corresponding to the first shell 21 (that is, the first heat-conducting portion 241) is 0.057 mm, and the thickness of the portion of the heat-conducting sheet 24 corresponding to the second shell 22 (that is, the second heat-conducting portion 242) is 0.057 mm.

[0223] See also Fig.19b , Fig.19b Schematic diagram of the laminated structure of a heat-conducting sheet 24 in the prior art. The heat-conducting sheet 24 includes a first heat-conducting layer 24f, a third protective layer 24g, a fourth protective layer 24h and an adhesive layer 24k, and the third protective layer 24g and the fourth protective layer 24h are relatively arranged on the two side surfaces of the first heat-conducting layer 24f. Among them, the material of the first heat-conducting layer 24f can be graphite, the material of the third protective layer 24g can be PTFE, and the material of the fourth protective layer 24h can be PET. The first heat-conducting layer 24f, the third protective layer 24g and the fourth protective layer 24h are all covered on the entire surface of the first heat-conducting layer 24f. That is, the third protective layer 24g and the fourth protective layer 24h are extended from the first heat-conducting part to the second heat-conducting part. The adhesive layer 24k is arranged on the portion of the fourth protective layer 24h corresponding to the first heat-conducting part 241 and the portion of the fourth protective layer 24h corresponding to the second heat-conducting part 242.

[0224] Will Fig.19b When the heat conductive sheet 24 shown is applied to a foldable electronic device, the third protective layer 24g may face the folding screen 10. The fourth protective layer 24h may face the housing assembly and be fixedly connected to the first housing 21 and the second housing 22 by means of the adhesive layer 24k.

[0225] exist Fig.19b In the heat conductive sheet 24 shown, the thickness of the first heat conductive layer 24f is 0.04 mm, the thickness of the third protective layer 24g is 0.016 mm, the thickness of the fourth protective layer 24h is 0.010 mm, and the thickness of the adhesive layer 24k is 0.01 mm. The thickness of the heat conductive sheet 24 corresponding to the first shell 21 is 0.076 mm, the thickness of the heat conductive sheet 24 corresponding to the shaft mechanism is 0.066 mm, and the thickness of the heat conductive sheet 24 corresponding to the second shell 22 is 0.076 mm.

[0226] Thus, compared to Fig.19b The heat conducting sheet 24 shown, Fig.19a The stacking thickness of the heat conductive sheet 24 and the first housing 21 and the stacking thickness of the heat conductive sheet 24 and the second housing 22 in the illustrated embodiment can be reduced by 0.019 mm. Therefore, when the heat conductive sheet 24 is applied to the foldable electronic device 100, the overall thickness of the foldable electronic device 100 can be reduced, which is conducive to realizing a thin design of the foldable electronic device 100.

[0227] When the third heat conducting part 243 is bent along with the folding of the housing assembly 20, the third heat conducting part 243 is in a stretched state. When the third heat conducting part 243 is stretched and deformed, it will exert a force on the folding screen 10, which will increase the risk of cracking of the folding screen and the risk of failure of the adhesive layers between the laminated layers of the folding screen.

[0228] In some embodiments, in order to reduce the force of the heat conductive sheet 24 on the folding screen under the same stretching amount and improve the bending performance of the third heat conductive portion 243, please refer to Fig. 20 , Fig. 20 for Fig.19a The schematic diagram of the structure of the first wear-resistant layer 24d in the heat conductive sheet 24 is shown. The first wear-resistant layer 24d is provided with a first hollow hole 24d1. In the thickness direction of the first wear-resistant layer 24d, the first hollow hole 24d1 penetrates the first wear-resistant layer 24d. That is, the first hollow hole 24d1 is a through hole. There are a plurality of first hollow holes 24d1, and the plurality of first hollow holes 24d1 are arranged at intervals on the first wear-resistant layer 24d.

[0229] See also Fig. 20 In this embodiment, a plurality of first hollow holes 24d1 may be arranged in a plurality of rows and columns. Specifically, a plurality of first hollow holes 24d1 in each row are spaced apart in the first direction, and a plurality of first hollow holes 24d1 in each column are spaced apart in the second direction. The first hollow holes 24d1 in two adjacent rows are staggered. The first direction and the second direction are different. Exemplarily, the first direction is parallel to the X-axis direction, and the second direction is parallel to the Y-axis direction. In this way, the opening rate of the first hollow holes 24d1 can be increased, which is beneficial to improving the deformation ability of the third heat conducting portion 243, and thus improving the bending performance of the third heat conducting portion 243.

[0230] Of course, the arrangement of the first hollow holes 24d1 is not limited to this. Fig.21 , Fig.21 The schematic diagram of the structure of the first wear-resistant layer 24d provided in some other embodiments of the present application. Fig.21 As shown in (a) of FIG. 1 , a plurality of first hollow holes 24d1 may be arranged in a rectangular array. Fig.21 As shown in (b) of FIG. 1 , the first hollow hole 24d1 may be in a strip shape, and the first hollow hole 24d1 may extend from one end to the other end of the third heat conducting portion 243 along the Y-axis direction. Alternatively, the first hollow hole 24d1 may also extend from one end to the other end of the third heat conducting portion 243 along the X-axis direction.

[0231] The shape of the first hollow hole 24d1 can be a rectangle, a square, a rhombus, a triangle, a trapezoid, a circle, an ellipse, a U-shape, an irregular shape, etc., and the embodiment of the present application does not make any specific limitation on this.

[0232] Furthermore, the second wear-resistant layer 24e is provided with second hollow holes. The arrangement and shape of the second hollow holes can be designed with reference to the first hollow holes 24d1, and will not be described in detail here.

[0233] In some embodiments, the size of the third heat conducting portion 243 in the Y-axis direction is smaller than the size of the first heat conducting portion 241 in the Y-axis direction, and the size of the third heat conducting portion 243 in the Y-axis direction is smaller than the size of the second heat conducting portion 242 in the Y-axis direction. In this way, the force acting on the folding screen 10 when the third heat conducting portion 243 is bent can also be reduced to a certain extent.

[0234] It has been verified through experiments that when the dimension of the third heat conducting portion 243 in the length direction of the rotating shaft mechanism 23 (that is, the Y-axis direction) is 14.4 mm, the heat conducting layer 24a is graphite, and the elongation of graphite reaches 3.5%, the heat conducting sheet 24 in the embodiment of the present application, after providing the above-mentioned first hollow hole 24d1 and the second hollow hole, can reduce the stress by about 16.2% at the same elongation compared to the solution without providing the above-mentioned first hollow hole 24d1 and the second hollow hole.

[0235] Therefore, the shell assembly 20 and the foldable electronic device 100 in the embodiment of the present application are provided with hollow holes on the first wear-resistant layer 24d and the second wear-resistant layer 24e, that is, a grille design is performed through the first wear-resistant layer 24d and the second wear-resistant layer 24e, and the size of the third heat-conducting part 243 in the Y-axis direction (for example, the width size of the third heat-conducting part 243) is reduced, thereby reducing the force of the heat-conducting sheet 24 on the folding screen 10.

[0236] In other embodiments, see Fig. 22 , Fig. 22 The partial cross-sectional view of the housing assembly 20 provided in some other embodiments of the present application. Fig.17 The housing assembly 20 in the illustrated embodiment differs in that: Fig.17 The third heat conducting part 243 in the embodiment shown is not fixed relative to the rotating shaft mechanism 23. In this embodiment, the first section 2431 of the third heat conducting part 243 is connected to the rotating shaft mechanism 23 through the buffer material 90, and the second section 2432 of the third heat conducting part 243 is connected to the rotating shaft mechanism 23 through the buffer material 90. For details, please refer to Fig. 22 The first section 2431 is connected to the first rotating door plate 231 through the buffer material piece 90 , and the second section 2432 is connected to the second rotating door plate 232 through the buffer material piece 90 .

[0237] The buffer material 90 has a certain deformation capability. In some embodiments, the buffer material 90 can be an adhesive. For example, the adhesive can be a UV curing adhesive, a hot melt adhesive, a lead adhesive, a white glaze adhesive, a foam adhesive, a silicone adhesive, etc.

[0238] In this way, on the one hand, the position of the first section 2431 and the second section 2432 can be limited by the buffer material piece 90, thereby reducing the displacement of the first section 2431 and the second section 2432 relative to the rotating mechanism, and avoiding the first section 2431 and the second section 2432 from being clamped in the gap of the rotating shaft mechanism 23; on the other hand, since the buffer material piece 90 has a certain deformation ability, when the third heat conducting part 243 is bent together with the rotating shaft mechanism 23, the deformation of the buffer material piece 90 can be utilized to weaken the stress on the third heat conducting part 243, and the elongation rate of the third heat conducting part 243 can be reduced, which is beneficial to improving the reliability of the third heat conducting part 243 and reducing the possibility of the third heat conducting part 243 being damaged by breakage, delamination, etc.

[0239] On this basis, in order to reduce the overlapping dimension between the third heat conducting portion 243 and the rotating shaft mechanism 23, please refer to Fig.23 , Fig.23 for Fig. 22 The cross-sectional view is a schematic diagram of the rotating shaft mechanism 23. The first supporting surface 2311 is provided with a first groove 231b which is concave toward the first bottom surface 2312, and the buffer material 90 between the first section 2431 and the first rotating door plate 231 can be disposed in the first groove 231b.

[0240] Specifically, in this embodiment, the first groove 231b is recessed from a portion of the first bottom wall surface 231a1 toward the first bottom surface 2312. It can be understood that in other embodiments, the buffer material piece 90 can also be directly disposed on the first bottom wall surface 231a1.

[0241] Please continue reading Fig.23 The second supporting surface 2321 is provided with a second groove 232b which is concave toward the second bottom surface 2322, and the buffer material 90 between the second section 2432 and the second rotating door plate 232 is arranged in the second groove 232b. The arrangement method and the arrangement position of the second groove 232b can be designed with reference to the first groove 231b, and will not be described in detail here.

[0242] It is understandable that in other embodiments, the first section 2431 may be connected to the shaft mechanism 23 only through the buffer material piece 90, the second section 2432 and the shaft mechanism 23 are not fixed, or the second section 2432 and the shaft mechanism 23 are connected through other structures. In still other embodiments, the second section 2432 may be connected to the shaft mechanism 23 only through the buffer material piece 90, the first section 2431 and the shaft mechanism 23 are not fixed, or the first section 2431 and the shaft mechanism 23 are connected through other structures.

[0243] Please continue reading Fig. 22In this embodiment, when the rotating shaft mechanism 23 is in the unfolded state, the third section 2433 of the third heat conducting portion 243 is substantially parallel to the first supporting surface 2311. That is, the size of the third section 2433 is not redundant. In this way, during the folding process of the rotating shaft mechanism 23, the third section 2433 can be prevented from being sandwiched in the gap of the rotating shaft mechanism 23 (such as the gap between the first rotating door plate 231 and the middle door plate 233 and the gap between the second rotating door plate 232 and the middle door plate 233), and the risk of the heat conducting sheet 24 being scratched by the supporting sheet 25 during the bending process can be reduced.

[0244] The assembly method between the first section 2431 and the first rotating door plate 231 in the embodiment of the present application, and the assembly method between the second section 2432 and the second rotating door plate 232 can be applied to the shell assembly 20 and the foldable electronic device 100 in any embodiment of the present application.

[0245] See also Fig.24 , Fig.24 The partial cross-sectional view of the housing assembly 20 provided in some embodiments of the present application. Fig. 22 The difference of the shell assembly 20 in the illustrated embodiment is that, in the present embodiment, the hinge mechanism 23 is in the unfolded state, and at least part of the third section 2433 is arched in the direction away from the support sheet 25 to form an arched section 2433a. Specifically, the third section 2433 can be formed as a whole as the arched section 2433a, or a part of the structure of the third section 2433 is formed as the arched section 2433a. That is, the length of the third section 2433 is greater than the distance between the first section 2431 and the second section 2432. The size of the third section 2433 has a certain redundancy. In this way, the stress on the third heat conducting part 243 during the bending process can be reduced, thereby improving the reliability of the third heat conducting part 243, effectively avoiding the third heat conducting part 243 from being reversely arched due to multiple folding, and further reducing the force of the third heat conducting part 243 acting on the folding screen 10 during the bending process.

[0246] On this basis, see Fig.25 , Fig.25 for Fig.24 3D view of the middle door plate 233 of the housing assembly 20. The middle door plate 233 is provided with a third groove 233b. The arched section 2433a is located in the third groove 233b. In this way, the arched section 2433a can be accommodated by the third groove 233b. In this way, when the rotating shaft mechanism 23 is in the unfolded state, the stress on the third section 2433 can be reduced, and the third section 2433 can be kept stretched, so as to avoid the third section 2433 from bending due to insufficient accommodation space, thereby facilitating the improvement of the reliability of the heat conducting sheet 24.

[0247] The shape of the arched section 2433a matches the shape of the third groove 233b. Fig.25 The third groove 233b includes a third groove bottom wall 233b1, a first groove side wall 233b2 and a second groove side wall 233b3. The orientation of the third groove bottom wall 233b1 is the same as that of the third supporting surface 2331. The first groove side wall 233b2 is connected to the side of the third groove bottom wall 233b1 close to the first rotating door plate 231, and the second groove side wall 233b3 is connected to the side of the third groove bottom wall 233b1 close to the second rotating door plate 232. In the direction from the rotation shaft mechanism 23 to the supporting sheet 25, the first groove side wall 233b2 extends toward the first rotating door plate 231, and the second groove side wall 233b3 extends toward the direction close to the second rotating door plate 232. In this way, the extrusion stress of the third section 2433 can be further reduced, and stress concentration on the third section 2433 can be avoided, thereby further improving the reliability of the third section 2433.

[0248] On the basis of the above embodiment, in order to further reduce the stress on the third section 2433, a smooth transition is formed between the first groove side wall 233b2 and the third groove bottom wall 233b1, and a smooth transition is formed between the second groove side wall 233b3 and the third groove bottom wall 233b1.

[0249] In some other embodiments, the third groove bottom wall 233b1, the first groove side wall 233b2 and the third groove side wall of the third groove 233b may also be arranged on a common arc surface. In this case, the shape of the arched section 2433a may be an arc.

[0250] See also Figure 24-25 In this embodiment, the third groove 233b is formed in the third sink groove 233a. Specifically, the third groove 233b is formed by a portion of the third bottom wall surface 233a1 of the third sink groove 233a being recessed in a direction away from the support sheet 25. In this way, it is helpful to eliminate the step difference between the other parts of the third section 2433 except the arched section 2433a and the first section 2431, and avoid bending between the third section 2433 and the first section 2431, thereby reducing the stress on the heat conducting sheet 24.

[0251] It is understandable that, in other embodiments, the third groove 233b may also be formed by the third supporting surface 2331 being recessed toward the third bottom surface 2332. In this case, the middle door panel 233 may also be provided with a third recessed groove 233a, or may not be provided with the third recessed groove 233a.

[0252] In the shell assembly 20 and the foldable electronic device 100 in this embodiment, the third heat-conducting part 243 is redundant, and the third section 2433 and the middle door panel 233 are not relatively fixed, which can reduce the stress of the heat-conducting sheet 24 during the bending process, and can reduce the force applied by the heat-conducting sheet 24 to the folding screen 10, and can improve the reliability of the foldable electronic device 100.

[0253] It should be noted that in the embodiment of the present application, the structure of the third section 2433 can be applied to the shell assembly 20 and the foldable electronic device 100 in any embodiment of the present application.

[0254] See also Fig.26 , Fig.26 A three-dimensional diagram of the housing assembly 20 is provided for some other embodiments of the present application. Fig.24 The difference of the housing assembly 20 in the illustrated embodiment is that the middle door panel 233 in this embodiment is provided with a limit plate 234, and the third section 2433 is arranged opposite to and spaced apart from the third groove bottom wall 233b1. The third section 2433 is located between the limit plate 234 and the third groove bottom wall 233b1. Specifically, a limit space is defined between the limit plate 234 and the third groove 233b. The third section 2433 is located in the limit space. In this way, the movement of the third section 2433 in the thickness direction of the rotating shaft mechanism 23 can be limited by the limit plate 234, which can further reduce the influence of the anti-arch of the third section 2433 on the folding screen 10.

[0255] See also Figure 27-Figure 28 , Fig. 27 for Fig.26 The schematic diagram of the assembly of the limit plate 234 and the rotating shaft mechanism 23 in the housing assembly 20 is shown. Fig.28 for Fig. 27 2 is an exploded view of the limit plate 234 and the rotating shaft mechanism 23 shown in FIG. In some embodiments, the limit plate 234 is detachably connected to the middle door plate 233. In this way, during the assembly process, the third section 2433 can be assembled to the third groove 233b first, and then the limit plate 234 can be connected to the middle door plate 233. In this way, it is possible to avoid the size of the third groove 233b limiting the size of the first heat conducting part 241 and the second heat conducting part 242, and the size of the first heat conducting part 241 and the second heat conducting part 242 in the Y-axis direction can be guaranteed, thereby improving the heat dissipation capacity of the housing assembly 20 and improving the heat dissipation performance of the housing assembly 20.

[0256] Exemplarily, one end of the limit plate 234 can be detachably connected to the middle door panel 233. For example, in some embodiments, one end of the limit plate 234 can be connected to the middle door panel 233 by a fastener 40. In other embodiments, one end of the limit plate 234 can also be connected to the middle door panel 233 by a buckle or the like. The other end of the limit plate 234 can be connected to the middle door panel 233 by a snap connection, a fastener connection, or the other end of the limit plate 234 can also be rotatably connected to the middle door panel 233 by a rotating shaft, a flexible member, or the like.

[0257] On the basis of any of the above embodiments, the surface of the limiting plate 234 that is away from the third groove 233b is coplanar with the third supporting surface 2331. Exemplarily, the third supporting surface 2331 is provided with a mounting groove 233c that is recessed toward the third bottom surface 2332, and the limiting plate 234 is disposed in the mounting groove 233c. In this way, the limiting plate 234 can support the supporting sheet 25 together with the middle door plate 233, which can increase the supporting area of ​​the supporting sheet 25, thereby increasing the flatness of the supporting sheet 25 when the rotating shaft mechanism 23 is in the unfolded state.

[0258] It can be understood that the limiting plate 234 in this embodiment can be applied to the housing assembly 20 and the foldable electronic device 100 in any embodiment of the present application.

[0259] In the above embodiments, the support sheet 25 is formed into a flat plate, and the accommodation space 80 between the support sheet 25 and the rotating shaft mechanism 23 is defined by the first sinking groove 231a, the second sinking groove 232a and the third sinking groove 233a on the support sheet 25 and the rotating shaft mechanism 23. Fig.29 , Fig.29 A three-dimensional diagram of a support sheet 25 provided for some other embodiments of the present application. The difference between the support sheet 25 in this embodiment and the support sheet 25 in the above embodiments is that the support sheet 25 in this embodiment has a step groove 25e on the second surface 25b that is recessed toward the first surface 25a. An accommodating space 80 for accommodating the third heat conducting portion 243 can be defined between the step groove 25e and the rotating shaft mechanism 23. In this case, the first sink groove 231a, the second sink groove 232a and the third sink groove 233a can be provided on the rotating shaft mechanism 23, or the first sink groove 231a, the second sink groove 232a and the third sink groove 233a can be omitted.

[0260] For details, please refer to Fig.29 The support sheet 25 includes a first side surface 25c and a second side surface 25d opposite to each other. When the shaft mechanism 23 is in the unfolded state, the first side surface 25c faces the first housing 21. The step groove 25e passes through the first side surface 25c and the second side surface 25d. The structure is simple and the processing is convenient.

[0261] It can be understood that the support sheet 25 in this embodiment can be applied to the housing assembly 20 and the foldable electronic device 100 in any embodiment of the present application.

[0262] The shell assembly 20 and the foldable electronic device 100 in this embodiment can further reduce the force exerted on the folding screen 10 by the reverse arch of the third section 2433 by setting the limiting plate 234, and can further reduce the risk of the heat conducting sheet 24 being scratched by the supporting sheet 25 during the bending process.

[0263] It is understandable that in other embodiments, the first sink groove 231a, the second sink groove 232a and the third sink groove 233a may not be provided on the rotating shaft mechanism 23, and at the same time, the step groove 25e is not provided on the supporting sheet 25. In this case, the supporting sheet 25 and the rotating shaft mechanism 23 may be separated by a connecting member (such as a boss, an adhesive structure, etc.). In this case, an accommodating space 80 can also be defined between the supporting sheet 25 and the rotating shaft mechanism 23.

[0264] See also Fig.30 , Fig.30 for Figure 8 The temperature simulation diagram of the foldable electronic device 100 is shown after the housing assembly 20 is applied to the foldable electronic device 100. Fig.30 It can be seen that in the foldable electronic device 100 in the embodiment of the present application, the maximum temperature of the first shell 21 is 42.085°C, and the maximum temperature of the second shell 22 is 32.7565°C. The temperature fault phenomenon in the axial area is improved. The temperature difference between the maximum temperature of the first shell 21 and the maximum temperature of the second shell 22 is 9.3285°C.

[0265] Compared with the foldable electronic device 100 in the related art, the maximum temperature of the foldable electronic device in the embodiment of the present application is reduced by 0.83°C, and the temperature difference between the maximum temperature of the first shell 21 and the maximum temperature of the second shell 22 is reduced by 1.9443°C.

[0266] According to the description of the above embodiments, the shell assembly 20 and the foldable electronic device 100 in the embodiment of the present application, by providing a support sheet 25 and a cross-axis heat-conducting sheet 24, and providing the third heat-conducting portion 243 of the heat-conducting sheet 24 between the support sheet 25 and the hinge mechanism 23, on the one hand, effectively reduce the maximum temperature of the foldable electronic device 100 and reduce the temperature difference between the first shell 21 and the second shell 22; on the other hand, effectively reduce the screen light and shadow, and optimize the folding mark of the folding screen; on the other hand, avoid direct contact between the heat-conducting sheet 24 and the folding screen 10, and reduce the risk of the folding screen 10 being pulled and causing the folding screen 10 to arch during the bending process; on the other hand, reduce the risk of the shell assembly 20 and the foldable electronic device 100 hitting the screen after being folded 200,000 times.

[0267] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0268] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A housing assembly, characterized in that: include: A first shell, a second shell and a rotating shaft mechanism, wherein the rotating shaft mechanism is connected between the first shell and the second shell, and the first shell can rotate relative to the second shell, so that the shell assembly can switch between an unfolded state and a folded state; A support sheet, the support sheet is arranged at one side of the rotating shaft mechanism, an accommodation space is provided between the support sheet and the rotating shaft mechanism, when the rotating shaft mechanism is in the unfolded state, the support sheet is stacked on the rotating shaft mechanism, and when the rotating shaft mechanism is in the folded state, the support sheet is bent; A heat conducting sheet, the heat conducting sheet comprising a first heat conducting portion, a second heat conducting portion and a third heat conducting portion, the first heat conducting portion being fixedly connected to the first shell, the second heat conducting portion being fixedly connected to the second shell, the third heat conducting portion being connected between the first heat conducting portion and the second heat conducting portion, and at least a portion of the third heat conducting portion being located in the accommodating space.

2. The housing assembly according to claim 1, characterized in that: The rotating shaft mechanism comprises a base, a first rotating door plate and a second rotating door plate, the first rotating door plate and the second rotating door plate are rotatably connected to opposite sides of the base respectively, the first rotating door plate comprises a first supporting surface, the second rotating door plate comprises a second supporting surface, and when the shell assembly is in the unfolded state, the supporting sheet is stacked on the first supporting surface and the second supporting surface; The third heat conducting portion includes a first section and a second section, the first section is located between the supporting sheet and the first rotating door plate, and the second section is located between the supporting sheet and the second rotating door plate.

3. The housing assembly according to claim 2, characterized in that: The first rotating door panel includes a first bottom surface, which is opposite to the first supporting surface. The first supporting surface is provided with a first recessed groove which is recessed toward the first bottom surface. A first accommodating groove is defined between the supporting plate and the first recessed groove. At least part of the first section is located in the first accommodating groove.

4. The housing assembly according to claim 3, characterized in that: The first rotating door plate comprises a first inner side surface and a first outer side surface which are opposite to each other, and when the housing assembly is in the unfolded state, the first inner side surface faces the second rotating door plate; The first recessed groove passes through the first inner side surface and the first outer side surface.

5. The housing assembly according to claim 3 or 4, characterized in that: The first sink includes a first bottom wall surface, the orientation of the first bottom wall surface is the same as the orientation of the first supporting surface, and the first bottom wall surface is parallel to the first supporting surface. When the shell assembly is in the expanded state, the first section is supported on the first bottom wall surface.

6. The housing assembly according to any one of claims 3 to 5, characterized in that: The second rotating door panel includes a second bottom surface, which is opposite to the second supporting surface. The second supporting surface is provided with a second recessed groove which is recessed toward the second bottom surface. A second accommodating groove is defined between the supporting plate and the second recessed groove. At least part of the second section is located in the second accommodating groove.

7. The housing assembly according to any one of claims 2 to 6, characterized in that: When the shell assembly is in the expanded state, the first section is parallel to the first supporting surface, and / or the second section is parallel to the second supporting surface.

8. The housing assembly according to any one of claims 2 to 7, characterized in that: The first section is connected to the first rotating door panel via a buffer material, and / or the second section is connected to the second rotating door panel via a buffer material piece.

9. The housing assembly according to claim 8, characterized in that: The buffer material piece is adhesive.

10. The housing assembly according to any one of claims 2 to 9, characterized in that: The rotating shaft mechanism further includes an intermediate door plate, the intermediate door plate is located between the first rotating door plate and the second rotating door plate, the intermediate door plate includes a third supporting surface, and when the housing assembly is in the expanded state, the first supporting surface, the second supporting surface, and the third supporting surface are oriented in the same direction; The third heat conducting portion further includes a third section, the third section is connected between the first section and the second section, and the third section is located between the supporting sheet and the middle door panel.

11. The housing assembly according to claim 10, characterized in that: The middle door panel includes a third bottom surface, which is opposite to the third supporting surface. The third supporting surface is provided with a third recessed groove which is recessed toward the third bottom surface. A third accommodating groove is defined between the supporting plate and the third recessed groove. At least a portion of the third section is located in the third accommodating groove.

12. The housing assembly according to claim 11, characterized in that The third sink includes a third bottom wall surface, the orientation of the third bottom wall surface is the same as the orientation of the third supporting surface, and the third bottom wall surface is parallel to the third supporting surface. When the shell assembly is in the expanded state, the third section is supported on the third bottom wall surface.

13. The housing assembly according to claim 12, characterized in that: A first groove is provided on the first supporting surface, and the first groove includes a first bottom wall surface, and the orientation of the first bottom wall surface is the same as the orientation of the first supporting surface. When the shell assembly is in the expanded state, the first section is supported on the first bottom wall surface, and the first bottom wall surface is coplanar with the third bottom wall surface.

14. The housing assembly according to any one of claims 10 to 13, characterized in that: When the shell assembly is in the expanded state, the third section is parallel to the third supporting surface.

15. The housing assembly according to any one of claims 10 to 13, characterized in that: At least a portion of the third section is arched toward a direction away from the support sheet to form an arched section.

16. The housing assembly according to claim 15, characterized in that The middle door panel comprises a third bottom surface, the third bottom surface is opposite to the third supporting surface, a third groove which is recessed toward the third bottom surface is arranged on the third supporting surface, and the arched section is located in the third groove.

17. The housing assembly according to claim 16, characterized in that The third groove comprises: a third groove bottom wall, the third groove bottom wall facing the support sheet; a first groove side wall, the first groove side wall being connected to a side of the third groove bottom wall close to the first rotating door panel; a second groove side wall, the second groove side wall being connected to a side of the third groove bottom wall close to the second rotating door panel; In the direction from the middle door panel to the supporting plate, the first groove side wall extends toward the direction close to the first rotating door panel, and the second groove side wall extends toward the direction close to the second rotating door panel.

18. The housing assembly according to claim 16 or 17, characterized in that: The third groove comprises a third groove bottom wall, and the third groove bottom wall faces the supporting sheet; The housing assembly further comprises a limit plate, which is arranged on the middle door plate, the limit plate is opposite to and spaced apart from the bottom wall of the third groove, and the arched section is located between the limit plate and the bottom wall of the third groove.

19. The housing assembly according to claim 18, characterized in that The limiting plate is detachably connected to the middle door panel.

20. The housing assembly according to any one of claims 1 to 19, characterized in that: When the housing assembly switches between the unfolded state and the folded state, at least a portion of the support sheet can slide relative to the rotating shaft mechanism.

21. The housing assembly according to any one of claims 1 to 20, characterized in that: The support sheet comprises a first surface and a second surface opposite to each other, and a first side surface and a second side surface opposite to each other, the second surface faces the rotating shaft mechanism, and when the shell assembly is in the unfolded state, the first side surface faces the first shell; The second surface is provided with a step groove avoiding toward the first surface, the step groove runs through the first side surface and the second side surface, and the accommodating space is defined between the step groove and the rotating shaft mechanism.

22. The housing assembly according to any one of claims 1 to 21, characterized in that , the thermal conductive sheet comprises: Thermally conductive layer; A first protective layer, the first protective layer covering a surface of the heat conductive layer on a side away from the rotating shaft mechanism; A second protective layer, wherein the second protective layer covers a surface of the heat conductive layer on one side facing the rotating shaft mechanism.

23. The housing assembly according to claim 22, characterized in that The first housing includes a first fixing surface, and the first heat conducting portion is fixedly connected to the first fixing surface; The heat conducting sheet comprises a first wear-resistant layer, the first wear-resistant layer is arranged on a side of the first protective layer away from the heat conducting layer, and when the shell assembly is in the unfolded state, the orthographic projection of the first wear-resistant layer on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism on the reference plane, and the orthographic projection of the first wear-resistant layer on the reference plane does not overlap with the orthographic projection of the first fixing surface on the reference plane; and / or The heat conducting sheet comprises a second wear-resistant layer, the second wear-resistant layer is arranged on a side of the second protective layer away from the heat conducting layer, and when the housing assembly is in the unfolded state, the orthographic projection of the second wear-resistant layer on the reference plane overlaps with the orthographic projection of the rotating shaft mechanism on the reference plane, and the orthographic projection of the second wear-resistant layer on the reference plane does not overlap with the orthographic projection of the first fixing surface on the reference plane; Wherein, the reference plane is parallel to the first fixing surface.

24. The housing assembly according to claim 22 or 23, characterized in that: The elongation at break of the heat-conducting layer is greater than or equal to 3.5%.

25. A foldable electronic device, characterized in that: include: A housing assembly, wherein the housing assembly is the housing assembly according to any one of claims 1 to 24; A folding screen is arranged on the shell assembly.

Images