Rear shell component for mobile terminal, manufacturing method of rear shell component and mobile terminal

Abstract

The embodiment of the invention provides a rear shell component for a mobile terminal, a manufacturing method of the rear shell component and the mobile terminal. The rear shell component comprises a rear shell body and a supporting structure, the rear shell body comprises a frame part and a back plate part, the frame part and the back plate part define a containing cavity, the supporting structure is arranged in the containing cavity, the supporting structure is welded to the inner wall of the frame part, the supporting structure is welded to the inner wall of the back plate part or integrally connected with the inner wall of the back plate part, and the supporting structure is arranged in the containing cavity. The support structure and the entirety of the rear shell body define at least one positioning recess inside the rear shell member. According to the technical scheme, the rear shell component is applied to the mobile terminal, and the product structure reliability of the mobile terminal can be improved.

Description

Technical Field

[0001] This application relates to the field of mobile terminal technology, and in particular to a back cover component for a mobile terminal, a method for manufacturing the same, and the mobile terminal itself. Background Technology

[0002] With the continuous advancement of technology, mobile terminals are widely used in all aspects of people's lives due to their rich functionality, ease of use, small size, and light weight. The back cover is a major supporting component of a mobile terminal, serving to support, install, or limit the movement of other components. Furthermore, the back cover is crucial to the mobile terminal's appearance, texture, and resistance to wear and corrosion. Given the complex and varied usage scenarios of mobile terminals, their back cover design is a key aspect determining the structural reliability of the product. Summary of the Invention

[0003] This application provides a back cover component for a mobile terminal, a method for manufacturing the same, and the mobile terminal itself, to improve the structural reliability of the mobile terminal.

[0004] According to one aspect of the embodiments of this application, a rear shell component for a mobile terminal is provided, comprising a rear shell body and a support structure, wherein: the rear shell body includes a frame portion and a back plate portion, the frame portion and the back plate portion defining a receiving cavity; the support structure is disposed within the receiving cavity, the support structure is welded to the inner wall of the frame portion, the support structure is welded to or integrally connected to the inner wall of the back plate portion, and the support structure and the rear shell body together define at least one positioning recess on the inner side of the rear shell component.

[0005] According to the embodiments of this application, the rear shell component can be designed with one or more positioning recesses on its inner side based on the support structure, thereby achieving at least the following technical effects: On the one hand, the positioning recesses can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal; on the other hand, the support structure is welded to the inner wall of the frame portion and welded to or integrally connected to the inner wall of the back plate portion, which can improve the structural strength of the rear shell component, thereby also helping to improve the product structure reliability of the mobile terminal; furthermore, the processing and manufacturing of the support structure can be achieved through various process schemes, making the choice of manufacturing process for the rear shell component more abundant and flexible, thereby helping to improve manufacturing accuracy and reduce manufacturing costs.

[0006] In some embodiments, the support structure includes: a first protruding structure welded to the inner wall of the frame portion; and a second protruding structure welded to or integrally connected to the inner wall of the back plate portion. Since the first and second protruding structures are convex in shape, corresponding recesses can be formed between the protrusions, such as the aforementioned positioning recesses.

[0007] In some embodiments, the first protruding structure is not connected to the inner wall of the back plate; or, the first protruding structure is integrally connected to the inner wall of the back plate; or, at least a portion of the first protruding structure is welded to the inner wall of the back plate. Depending on the specific structural design of the support structure and the selected manufacturing process, the first protruding structure and the inner wall of the back plate may have the above-mentioned different forms of connection.

[0008] In some embodiments, at least a portion of the first protrusion structure is strip-shaped; at least a portion of the second protrusion structure is strip-shaped, or at least a portion of the second protrusion structure is boss-shaped. Depending on the specific structural design of the support structure, the first and second protrusion structures may have various design shapes.

[0009] In some embodiments, the support structure and the rear shell body as a whole define a plurality of positioning recesses on the inner side of the rear shell member, wherein at least two of the positioning recesses do not overlap in their orthographic projections on the back plate portion. In these embodiments, the positioning recesses can be arranged in a flat arrangement, i.e., their orthographic projections on the back plate portion do not overlap.

[0010] In some embodiments, at least two positioning recesses are arranged in a direction orthogonal to the back panel, and the orthographic projection of one of the positioning recesses on the back panel overlaps with the orthographic projection of the other positioning recess on the back panel, i.e., there is an overlap in the orthographic projections of the two positioning recesses on the back panel. In these embodiments, the arrangement of the positioning recesses allows some electronic components to be stacked in a direction orthogonal to the back panel.

[0011] In some embodiments, a portion of the support structure serves as a mechanical reinforcement for the rear shell member. This improves the deformation resistance of the rear shell member, thereby enhancing its structural strength.

[0012] In some embodiments, the support structure is welded to the inner wall of the frame portion using friction stir welding; and / or, the support structure is welded to the inner wall of the back plate portion using friction stir welding. Compared to fusion welding, friction stir welding can produce welds with fewer defects and has greater compatibility with welding parameters and welding materials.

[0013] In some embodiments, the support structure is integrally connected to the inner wall of the back panel; the frame portion includes multiple spliced ​​segments assembled in a frame shape, wherein the back panel is assembled with the multiple spliced ​​segments, and the support structure is welded to the inner wall of each of the multiple spliced ​​segments. The rear shell component of this embodiment not only achieves the aforementioned beneficial effects, but also its back panel, support structure, and multiple spliced ​​segments can be obtained from sheet metal parts through cutting and bending or CNC milling, making the manufacturing process relatively simple and helping to save production raw materials.

[0014] In some embodiments, a gap is provided between the back panel and at least one of the multiple splicing segments to allow electromagnetic waves to pass through. This facilitates the design of the antenna system for the mobile terminal.

[0015] In some embodiments, all periphery portions of the back panel and the frame portion are connected; or, the frame portion includes a first frame edge portion and a second frame edge portion, wherein the back panel is connected to the first frame edge portion but not to the second frame edge portion, and the second frame edge portion is used to connect to the rear shell decorative surface of the mobile terminal. In this application embodiment, the specific shapes of the frame portion and the back panel are not limited and can be flexibly designed according to product design requirements.

[0016] In some embodiments, at least one positioning recess is used to limit at least one electronic component of the mobile terminal. The at least one electronic component includes one or more of a motherboard, sub-board, camera module, flash, laser autofocus sensor, ambient light sensor, speaker, earpiece, microphone, wireless charging module, chip card, motor, or battery. The rear shell component can be flexibly designed according to the hardware configuration of the mobile terminal product, thereby providing reliable limiting for some electronic components of the mobile terminal, reducing the assembly design difficulty of these electronic components, and improving their assembly reliability.

[0017] In some embodiments, both the frame portion and the back plate portion include a first metal layer and a second metal layer that are compositely connected. The first metal layer is located on the side of the second metal layer facing away from the receiving cavity. Furthermore, the main elements of the first and second metal layers are different, while the support structure has the same main element as the second metal layer. The back shell body is made of two metal materials with different main elements, thus combining the advantages of both materials. The support structure has the same main element as the second metal layer. Compared to using materials with different main elements, this reduces or even avoids weld weaknesses caused by differences in material thermal conductivity and coefficient of linear expansion.

[0018] In some embodiments, the thickness of the first metal layer is less than the thickness of the second metal layer, and the hardness of the first metal layer is greater than the hardness of the second metal layer. This results in a rear shell component that not only has good surface wear resistance but also meets structural strength design requirements. Furthermore, designing the thickness of the second metal layer to be greater than the thickness of the first metal layer makes it easier to achieve a reliable connection between the support structure and the frame and back plate portions, and also makes the support structure easier to manufacture.

[0019] In some embodiments, the side of the first metal layer facing away from the second metal layer has a surface treatment layer. The surface treatment layer can improve the wear resistance, corrosion resistance, stain resistance, or fingerprint resistance of the surface of the rear shell component, and can also improve the appearance of the rear shell component, thereby making the product design more competitive.

[0020] In some embodiments, the material of the first metal layer includes titanium, titanium alloy, or stainless steel, the material of the second metal layer includes aluminum alloy, and the material of the supporting structure includes aluminum alloy. Titanium has the characteristics of good corrosion resistance, high strength, and light weight; titanium alloy has the characteristics of good corrosion resistance, high strength, and good toughness; steel has the characteristics of high strength, good wear resistance, easy processing, and low cost; aluminum alloy has the characteristics of low density, good mechanical properties, good processing performance, non-toxicity, easy recycling, and excellent thermal conductivity and corrosion resistance.

[0021] According to one aspect of the embodiments of this application, a method for manufacturing a rear shell component for a mobile terminal is provided, the method comprising:

[0022] A rear shell body is provided, the rear shell body includes a frame portion and a back plate portion, wherein the frame portion and the back plate portion are integrally connected and define a receiving cavity;

[0023] A middle plate is provided, which is welded to the inner wall of the frame portion, and the middle plate is also welded to the inner wall of the back plate portion; and

[0024] A portion of the material of the middle plate is removed while retaining at least a portion of the welded structure between the middle plate and the frame portion, and at least a portion of the welded structure between the middle plate and the back plate portion, to obtain a support structure, wherein the support structure is welded to the inner wall of both the frame portion and the inner wall of the back plate portion, and the support structure and the rear shell body together define at least one positioning recess on the inner side of the rear shell member.

[0025] The back shell component manufactured using the method described in the above embodiments of this application, when applied to a mobile terminal, can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure is welded to the inner wall of the frame portion and to the inner wall of the back plate portion, the structural strength of the back shell component can be improved, which is beneficial to improving the product structure reliability of the mobile terminal. In addition, since the support structure is obtained by removing part of the material of the middle plate, it is not only simpler to process and manufacture, but also has a lower manufacturing cost, and it is easy to obtain accurate structural parameters, thereby further improving the assembly reliability of electronic components in the mobile terminal.

[0026] In some embodiments, welding the middle plate to the inner wall of the frame portion includes: welding the middle plate to the inner wall of the frame portion along a first preset welding trajectory line using a friction stir welding process; and / or, welding the middle plate to the inner wall of the back plate portion includes: welding the middle plate to the inner wall of the back plate portion along a second preset welding trajectory line using a friction stir welding process. The first preset welding trajectory line and the second preset welding trajectory line can be designed according to the specific structural dimensional parameters of the support structure. For example, in some embodiments, the first preset welding trajectory line can be a closed shape, a line segment shape, or a combination of multiple line types; the second preset welding trajectory line can be a closed shape, a line segment shape, or a combination of multiple line types.

[0027] In some embodiments, a rear shell body is provided, comprising: providing a composite sheet material, the composite sheet material including a first metal layer and a second metal layer with different main elements; and molding the composite sheet material into a rear shell body having a receiving cavity, wherein the first metal layer is located on the side of the second metal layer opposite to the receiving cavity. The rear shell body is made of two metal materials with different main elements, which can combine the material advantages of both.

[0028] According to one aspect of the embodiments of this application, a method for manufacturing a rear shell component for a mobile terminal is provided, the method comprising:

[0029] Provide a sheet metal component;

[0030] Remove a portion of the material from the periphery of the sheet metal part to obtain a first part and a second part with different thicknesses, wherein the first part surrounds the second part, and the thickness of the first part is less than the thickness of the second part;

[0031] Fold the first part toward the second part and fit it together with the second part;

[0032] Weld the sidewalls of the first part to the second part; and

[0033] Remove some material from the second part and retain at least a portion of the welded structure between the first part and the second part to obtain a rear shell body and a support structure, wherein the rear shell body includes a frame portion and a back plate portion integrally connected and defining a receiving cavity, the support structure is located in the receiving cavity and is welded to the inner wall of the frame portion and integrally connected to the inner wall of the back plate portion, and the support structure and the rear shell body integrally define at least one positioning recess on the inner side of the rear shell member.

[0034] The back shell component manufactured using the method described in the above embodiments of this application, when applied to a mobile terminal, can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure is welded to the inner wall of the frame portion and integrally connected to the inner wall of the back plate portion, the structural strength of the back shell component can be improved, which is beneficial to improving the product structure reliability of the mobile terminal. In addition, since the support structure is obtained by removing part of the material of the second part, it is not only easier to process and manufacture with lower manufacturing costs, but also easier to obtain accurate structural parameters, thereby further improving the assembly reliability of electronic components in the mobile terminal.

[0035] In some embodiments, the manufacturing method further includes: after folding the first part toward the second part and fitting it to the second part, and before welding the sidewalls of the first part and the second part, removing a portion of the material from the first part and / or the second part to make the first part flush with the second part. This step, on the one hand, can appropriately reduce the dimensional accuracy requirements for the sheet metal parts, the processing accuracy requirements for the step of removing a portion of the sheet metal parts, or the forming accuracy requirements for stretching and bending in the aforementioned folding step; on the other hand, it can also obtain intermediate preforms with higher precision.

[0036] In some embodiments, welding the sidewalls of the first part and the second part includes: welding the sidewalls of the first part and the second part together along a preset welding trajectory using a friction stir welding process. In some embodiments, the preset welding trajectory may be closed in shape, so that the first part and the second part are welded at all points around the perimeter. In some embodiments, the preset welding trajectory may also be line segment in shape, so that the first part and the second part are welded only in areas where the local design requires it.

[0037] In some embodiments, a sheet metal component is provided, comprising: providing a composite sheet metal, the composite sheet metal including a first metal layer and a second metal layer with different main elements; and removing a portion of the thickness of the peripheral region of the sheet metal component, including: removing a portion of the thickness of the peripheral region of the second metal layer. The rear shell component is made of two metal materials with different main elements, thus combining the material advantages of both.

[0038] According to one aspect of the embodiments of this application, a method for manufacturing a rear shell component for a mobile terminal is provided, the method comprising:

[0039] Provides one medium plate and multiple splicing segments;

[0040] Multiple splicing segments are assembled into a frame section, and the middle plate is welded to the inner wall of the frame section; and

[0041] Remove part of the material from the middle plate and retain at least a portion of the welded structure between the middle plate and the frame portion to obtain the rear shell body and the support structure. The rear shell body includes a back plate portion and a frame portion defining a receiving cavity. The support structure is located in the receiving cavity and is welded to the inner wall of the frame portion and integrally connected to the inner wall of the back plate portion. The support structure and the rear shell body together define at least one positioning recess on the inner side of the rear shell member.

[0042] The rear shell component manufactured using the method described in the above embodiments of this application, when applied to a mobile terminal, can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure is welded to the inner wall of the frame portion and integrally connected to the inner wall of the back plate portion, the structural strength of the rear shell component can be improved, which is beneficial to improving the product structure reliability of the mobile terminal. In addition, since the frame portion is composed of multiple splicing segments, not only is the processing and manufacturing simpler, but it also provides convenience for the design of the antenna system of the mobile terminal. For example, a gap for electromagnetic waves to pass through can be designed between the back plate portion and at least one splicing segment.

[0043] In some embodiments, welding the middle plate to the inner wall of the frame portion includes: welding the middle plate to the inner wall of the frame portion along a preset welding trajectory line using a friction stir welding process. In some embodiments, the preset welding trajectory line may be closed in shape, so that the middle plate and the frame portion are welded at all points around the perimeter. In some embodiments, the preset welding trajectory line may also be in the shape of a line segment, so that the middle plate and the frame portion are welded only in the areas required by the local design, but a welding structure is required between the middle plate and each splicing segment.

[0044] According to one aspect of the embodiments of this application, a method for manufacturing a rear shell component for a mobile terminal is provided, the method comprising:

[0045] A rear shell body is provided, the rear shell body including a frame portion and a back plate portion, wherein the frame portion and the back plate portion are integrally connected and define a receiving cavity; and

[0046] A support structure is provided, which is welded to the inner wall of the frame portion and to the inner wall of the back plate portion. The support structure is a die-cast part, and the support structure and the rear shell body together define at least one positioning recess on the inner side of the rear shell member.

[0047] The back shell component manufactured using the method described in the above embodiments of this application, when applied to a mobile terminal, can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure is welded to the inner wall of the frame portion and to the inner wall of the back plate portion, the structural strength of the back shell component can be improved, which is beneficial to improving the product structure reliability of the mobile terminal. In addition, since the support structure is a die-cast part, not only is the production efficiency high, but it is also easy to obtain accurate structural parameters, which is beneficial to further improving the assembly reliability of electronic components in the mobile terminal.

[0048] In some embodiments, welding the support structure to the inner wall of the frame portion includes: welding the support structure to the inner wall of the frame portion along a first preset welding trajectory line using a friction stir welding process; and / or, welding the support structure to the inner wall of the back plate portion includes: welding the support structure to the inner wall of the back plate portion along a second preset welding trajectory line using a friction stir welding process. The first and second preset welding trajectory lines can be designed according to the specific structural dimensional parameters of the support structure. For example, in some embodiments, the first preset welding trajectory line can be a closed shape, a line segment shape, or a combination of various line types; the second preset welding trajectory line can be a closed shape, a line segment shape, or a combination of various line types.

[0049] According to one aspect of the embodiments of this application, a mobile terminal is provided, comprising: a rear shell component product of the foregoing embodiments or a rear shell component manufactured according to the manufacturing method of the foregoing embodiments, a motherboard and a battery, and a display screen, wherein: the support structure and the rear shell body as a whole define at least two positioning recesses on the inner side of the rear shell component, the at least two positioning recesses including a motherboard positioning recess and a battery positioning recess; the motherboard and the battery are correspondingly located in the motherboard positioning recess and the battery positioning recess; the display screen is located in front of the motherboard and the battery and is connected to the frame portion.

[0050] According to the embodiments of this application, the mobile terminal has the following advantages: First, the design of its rear shell component can provide reliable positioning for the battery and motherboard of the mobile terminal, thereby reducing the assembly design difficulty of the battery and motherboard, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Second, since the support structure of the rear shell component is welded to the inner wall of the frame and to the inner wall of the back panel or integrally connected, the overall structural strength of the rear shell component is high, and the product structure reliability of the mobile terminal is high. Third, the processing and manufacturing of the rear shell component can be achieved through various process schemes, which is conducive to improving manufacturing accuracy and reducing the manufacturing cost of the mobile terminal. Attached Figure Description

[0051] Figure 1 This is a three-dimensional structural schematic diagram of the rear shell component according to some embodiments of this application;

[0052] Figure 2A For the rear shell member according to some embodiments of this application along Figure 1 A schematic diagram of the cross-sectional structure cut along the AA direction (the thick black solid line indicates that the two structures are welded together);

[0053] Figure 2B For the rear shell member according to some embodiments of this application along Figure 1 A schematic diagram of the cross-sectional structure cut along the AA direction (the thick black solid line indicates that the two structures are welded together);

[0054] Figure 3A This is a simplified cross-sectional schematic diagram of a rear shell member according to some embodiments of this application (illustrating the limitation of electronic components);

[0055] Figure 3B This is a simplified cross-sectional schematic diagram of a rear shell member according to some embodiments of this application (illustrating the limitation of electronic components);

[0056] Figure 4A For example, the rear shell member according to some embodiments of this application Figure 2A Microscopic images of the weld pool obtained at points C and D (dashed lines indicate the approximate boundary of the weld pool);

[0057] Figure 4B For example, the rear shell member according to some embodiments of this application Figure 2A Microscopic image of the weld pool obtained at point C (dashed line indicates the approximate boundary of the weld pool);

[0058] Figure 4C For example, the rear shell member according to some embodiments of this application Figure 2A Microscopic image of the weld pool obtained at point C (dashed line indicates the approximate boundary of the weld pool);

[0059] Figure 4D For example, the rear shell member according to some embodiments of this application Figure 2A Microscopic image of the weld pool obtained at point D (dashed line indicates the approximate boundary of the weld pool);

[0060] Figure 5 This is a schematic diagram of the rear appearance of a mobile terminal according to some embodiments of this application;

[0061] Figure 6A This is a simplified front view schematic diagram of the rear shell component according to some embodiments of this application;

[0062] Figure 6B For the rear shell member according to some embodiments of this application along Figure 6A A schematic diagram of the cross-sectional structure cut along the BB direction (showing the weld pool, where the thick black solid line indicates the welded connection between the two structures);

[0063] Figure 6C For the rear shell member according to some embodiments of this application along Figure 6A A schematic diagram of the cross-sectional structure cut along the BB direction (the thick black solid line indicates that the two structures are welded together);

[0064] Figure 7A This is a schematic flowchart illustrating a method for manufacturing a rear shell component according to some embodiments of this application;

[0065] Figure 7B This is a schematic diagram illustrating the manufacturing process of a rear shell component according to some embodiments of this application;

[0066] Figure 8A This is a schematic flowchart illustrating a method for manufacturing a rear shell component according to some embodiments of this application;

[0067] Figure 8B This is a schematic diagram illustrating the manufacturing process of a rear shell component according to some embodiments of this application;

[0068] Figure 9A This is a schematic flowchart illustrating a method for manufacturing a rear shell component according to some embodiments of this application;

[0069] Figure 9B This is a schematic diagram illustrating the manufacturing process of a rear shell component according to some embodiments of this application;

[0070] Figure 10 This is a schematic flowchart illustrating a method for manufacturing a rear shell component according to some embodiments of this application;

[0071] Figure 11 This is a cross-sectional structural diagram of a mobile terminal according to some embodiments of this application.

[0072] Figure label:

[0073] 400 - Mobile terminal; 100 - Rear shell component; 10 - Rear shell body; 11 - Frame portion; 12 - Back panel portion; 101 - Receiving cavity; 30 - Support structure;

[0074] 31, 31a, 31b - Positioning recess; 32 - First protruding structure; 33 - Second protruding structure; 33a - Boss-shaped portion; 33b - Strip-shaped portion;

[0075] 110 - Joint segment; 115 - Gap; 116 - Molten pool; 111 - First frame edge; 112 - Second frame edge; 113 - Third frame edge; 114 - Fourth frame edge;

[0076] 13 - Rear shell decorative surface; 102 - First metal layer; 103 - Second metal layer; 104 - Electronic components; 105 - Display screen; 300a, 300b - Middle plate;

[0077] 301 - First preset welding trajectory line; 302 - Second preset welding trajectory line; 410 - Composite plate; 420 - Plate component;

[0078] 501 - Part 1; 502 - Part 2; 503 - Preset welding trajectory line; 311 - Motherboard positioning recess; 312 - Battery positioning recess;

[0079] 41-Main board; 42-Sub-board; 43-Battery; 700, 800, 900, 1000-Manufacturing method;

[0080] S701~S703, S7011~S7012, S801-S805, S901~S903, S1001~S1002 - Steps. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0082] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0083] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0084] Some mobile terminals in related technologies, such as mobile phones, mainly include a metal back cover, a battery, a motherboard, and a display screen. The metal back cover has a cavity within which the battery, motherboard, and display screen are housed, with the battery and motherboard located between the display screen and the metal back cover. In these technologies, the metal back cover is generally formed using a sheet metal stamping process, which is a pressure processing method that uses pressure to separate or deform sheet metal placed between dies.

[0085] The technical defects of the aforementioned technologies are that, due to the limitations of the metal sheet thickness and forming process, it is usually impossible to form ideal ribs for limiting the battery and motherboard on the inside of the metal back shell. This poses a challenge to the reliable assembly of electronic components such as the battery and motherboard, and may affect the overall structural reliability of the mobile terminal product.

[0086] In view of this, embodiments of this application provide a back cover component for a mobile terminal, a method for manufacturing the same, and a mobile terminal, to improve the structural reliability of the mobile terminal.

[0087] In the embodiments of this application, the specific product type of the mobile terminal may include, but is not limited to, mobile phones, tablet computers, personal computers, wearable devices, etc. The back cover component may serve as the back cover of the mobile terminal or as one of the structural components of the back cover of the mobile terminal. When the back cover of the mobile terminal also includes other structural components, these other structural components may be, for example, a decorative surface layer of the back cover, a camera decorative ring, a side button, etc., and this application does not specifically limit them.

[0088] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0089] like Figure 1 , Figure 2A and Figure 2B As shown, where, Figure 1 This is a three-dimensional structural diagram of the rear shell component 100 for a mobile terminal according to some embodiments of this application. Figure 2A For the rear shell member according to some embodiments of this application along Figure 1 A schematic diagram of the cross-sectional structure cut along the AA direction. Figure 2B For the rear shell member according to other embodiments of this application along Figure 1 A schematic diagram of the cross-sectional structure cut along the AA direction.

[0090] like Figure 1 As shown, the rear shell component 100 includes a rear shell body 10 and a support structure 30 (lead lines in the figure indicate a portion of the support structure 30). The rear shell body 10 includes a side frame portion 11 and a back plate portion 12, which define a receiving cavity 101, within which the support structure 30 is disposed. Figure 2A and Figure 2B As shown, the support structure 30 is welded to the inner wall of the frame portion 11, and the support structure 30 is welded to the inner wall of the back plate portion 12 (as shown). Figure 2A (as shown) or integrated connection (such as) Figure 2B (As shown). Based on the design of the support structure 30, the support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100.

[0091] In this embodiment, the back cover body 10 can constitute at least a portion of the appearance structure of the mobile terminal, and its outer surface can serve as at least a portion of the appearance surface of the mobile terminal. The receiving cavity 101 can be understood as the receiving space defined by the frame portion 11 and the back plate portion 12. In this embodiment, the side of the back cover member 100 closer to the receiving cavity 101 is defined as its inner side, and correspondingly, the side further away from the receiving cavity 101 is defined as its outer side.

[0092] In the embodiments of this application, the “integrated connection” of two structures (such as the frame portion 11 and the back plate portion 12) can be understood as the two structures being connected together without assembly, and the two structures being unable to be disassembled or separated.

[0093] In this embodiment, the support structure 30 primarily serves to support, install, and limit the movement of some electronic components of the mobile terminal. Furthermore, the support structure 30 also provides structural reinforcement to the overall rear shell component 100. See also... Figure 1 As shown, since the connection direction between the support structure 30 and the frame portion 11 is parallel to the XY reference plane, the welding of the support structure 30 and the inner wall of the frame portion 11 can be defined as "XY direction connection"; since the connection direction between the support structure 30 and the back plate portion 12 is along the Z direction, the welding or integral connection of the support structure 30 and the inner wall of the back plate portion 12 can be defined as "Z direction connection".

[0094] In this embodiment of the application, the support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100. The positioning recess 31 can be used to limit the electronic components of the mobile terminal. The types of electronic components may include, but are not limited to, motherboard, sub-board, camera module, flash, laser focus sensor, ambient light sensor, speaker, earpiece, microphone, wireless charging module, chip card, motor, or battery.

[0095] like Figure 1 As shown, in some embodiments, the support structure 30 and the rear shell body 10 together define a plurality of positioning recesses 31 on the inner side of the rear shell member 100 (only some of the positioning recesses 31 are shown in the figure with lead lines). These plurality of positioning recesses 31 can be used to limit the positioning of multiple electronic components of the mobile terminal. The embodiments of this application do not specifically limit the specific number, structural shape, size and arrangement of the plurality of positioning recesses 31, and can be flexibly designed according to the hardware configuration of the mobile terminal product.

[0096] For example, in some embodiments, the shape of the positioning recess 31 can be a rectangular groove, a circular groove, or a stepped groove, etc. Figure 1 Only some positioning recesses 31 in the shape of rectangular grooves are shown in the diagram.

[0097] For example Figure 3A The diagram shown is a simplified cross-sectional view of the rear shell member 100 according to some embodiments of this application, illustrating the positioning of the electronic component 104. In these embodiments, the various positioning recesses 31 can be arranged in a flat manner, that is, their orthographic projections on the back plate portion 12 do not overlap.

[0098] For example Figure 3B The diagram shown is a simplified cross-sectional view of the rear shell member 100 according to other embodiments of this application, illustrating the limiting of electronic components 104. In these embodiments, at least two positioning recesses 31 (such as positioning recesses 31a and positioning recesses 31b) are arranged in a direction orthogonal to the back plate portion 12, and the orthogonal projection of one of the positioning recesses 31 on the back plate portion 12 (such as the orthogonal projection of positioning recess 31a on the back plate portion 12) overlaps with the orthogonal projection of the other positioning recess 31 on the back plate portion 12 (such as the orthogonal projection of positioning recess 31b on the back plate portion 12), that is, there is an overlapping portion of the orthogonal projections of the two positioning recesses 31 on the back plate portion 12. Thus, some electronic components 104 can be stacked in a direction orthogonal to the back plate portion 12.

[0099] As can be seen, according to the technical solution of the embodiments of this application, one or more positioning recesses 31 can be defined on the inner side of the rear shell member 100 based on the design of the support structure 30. Therefore, compared with the aforementioned related technologies, at least the following technical effects can be obtained:

[0100] On the one hand, it can provide reliable limits for the electronic components of mobile terminals, thereby reducing the difficulty of assembling and designing these electronic components, improving the reliability of their assembly, and thus improving the product structure reliability of mobile terminals.

[0101] On the other hand, the support structure 30 is welded to the inner wall of the frame portion 11 and welded to or integrally connected to the inner wall of the back plate portion 12. That is, the support structure 30 is connected to the back shell body 10 in both the XY and Z directions. This can improve the structural strength of the back shell component 100, thereby improving the product structure reliability of the mobile terminal.

[0102] On the other hand, the processing and manufacturing of the support structure 30 can be achieved through a variety of process schemes (which will be described in detail in the manufacturing method embodiments below), and the choice of manufacturing process for the rear shell component 100 can be more abundant and flexible, thereby helping to improve manufacturing accuracy and reduce manufacturing costs.

[0103] In this embodiment, the support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100, and the specific structural design of the support structure 30 is not limited. Figure 1 As shown, in some embodiments of this application, the support structure 30 includes a first protrusion structure 32 welded to the inner wall of the frame portion 11, and a second protrusion structure 33 welded to or integrally connected to the inner wall of the back plate portion 12.

[0104] This application does not limit the specific structural shape of the first protrusion structure 32 and the second protrusion structure 33. In some embodiments of this application, at least a portion of the first protrusion structure 32 may be strip-shaped, and at least a portion of the second protrusion structure 33 may be boss-shaped, or at least a portion of the second protrusion structure 33 may be strip-shaped. Figure 1 As shown, in this embodiment, the first protruding structure 32 is strip-shaped, and the second protruding structure 33 includes a boss-shaped portion 33a and a strip-shaped portion 33b. Since the first protruding structure 32 and the second protruding structure 33 are protruding, corresponding recesses can be formed between the protrusions, such as the aforementioned positioning recess 31.

[0105] Depending on the specific design of the support structure 30 and the selected manufacturing process, the first protruding structure 32 and the inner wall of the back plate 12 may have different forms of connection.

[0106] For example, in some embodiments, such as Figure 2A As shown, the first protruding structure 32 of the support structure 30 may not be connected to the inner wall of the back plate portion 12, so that the first protruding structure 32 is only welded to the inner wall of the frame portion 11 (i.e., connected in the XY direction). In these embodiments, the second protruding structure 33 of the support structure 30 may be welded to the inner wall of the back plate portion 12 (i.e., connected in the Z direction).

[0107] For example, in some embodiments, the first protrusion 32 of the support structure 30 is not only welded to the inner wall of the frame portion 11 (i.e., connected in the XY direction), but also integrally connected to the inner wall of the back plate portion 12 (i.e., connected in the Z direction). In these embodiments, the second protrusion 33 of the support structure 30 can be integrally connected to the inner wall of the back plate portion 12 (i.e., connected in the Z direction).

[0108] For example, in some embodiments, the first protruding structure 32 of the support structure 30 is not only welded to the inner wall of the frame portion 11 (i.e., connected in the XY direction), but at least a portion thereof can also be welded to the inner wall of the back plate portion 12 (i.e., connected in the Z direction). In these embodiments, the second protruding structure 33 of the support structure 30 can be welded to the inner wall of the back plate portion 12 (i.e., connected in the Z direction), and the aforementioned at least portion of the first protruding structure 32 that is welded to both the frame portion 11 and the back plate portion 12 can be located at the intersection of the first protruding structure 32 and the second protruding structure 33, such as... Figure 1 Point F as shown.

[0109] In these embodiments, the design of the support structure 30 can not only provide reliable positioning for the electronic components of the mobile terminal, but also improve the structural strength of the rear shell component 100 since the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, thereby improving the product structural reliability of the mobile terminal.

[0110] In some embodiments of this application, a portion of the support structure 30 can be used as a mechanical reinforcement structure for the rear shell member 100. For example, a portion of the first protrusion structure 32 and the second protrusion structure 33 can be designed as strips and used as reinforcing ribs of the rear shell member 100 instead of forming positioning grooves for limiting electronic components. Such a design can improve the deformation resistance of the rear shell member 100, thereby improving the structural strength of the rear shell member 100.

[0111] In the embodiments of this application, the support structure 30 and the frame portion 11, and the support structure 30 and the back plate portion 12 can be connected by the same or different welding processes, and the embodiments of this application do not specifically limit this.

[0112] In some embodiments, the support structure 30 and the inner wall of the frame portion 11 can be connected by XY direction welding through friction stir welding, and the support structure 30 and the inner wall of the back plate portion 12 can be connected by Z direction welding through friction stir welding.

[0113] Friction stir welding (FSW) utilizes the heat generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials being welded. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the tool under the rotational friction force, forming a dense solid-state weld under the pressure of the tool. Compared to fusion welding, FSW, being a solid-state welding process, avoids defects caused by the cooling process of the metal during fusion welding, such as porosity, slag inclusions, and hot cracks. It also enables green production, producing almost no welding fumes or spatter, and virtually no ultraviolet or electromagnetic radiation. Typically, FSW produces welds with fewer defects and has greater compatibility with welding parameters and materials.

[0114] In this embodiment, the XY-direction weld structure between the support structure 30 and the frame portion 11, and the Z-direction weld structure between the support structure 30 and the back plate portion 12 are sliced. Then, the surfaces of the two slices are sequentially ground (e.g., using 180-grit, 1200-grit, and 2500-grit sandpaper), polished (e.g., using 1μm alumina powder), and metallographic etched (e.g., using Kohler reagent for 10-30 seconds). After these treatments, the microstructure of the molten pool in the friction stir weld can be observed under a microscope. The molten pool typically refers to the liquid metal portion with a certain geometric shape formed on the weldment under the action of the welding heat source. The shape of the molten pool is an important factor in judging the welding quality. Normally, the molten pool should be roughly funnel-shaped. If the molten pool is flat, it indicates that there may be problems with distortion or excessive heat during the welding process.

[0115] The rear shell member 100 of some embodiments of this application is, for example, Figure 2A Sections were taken at points C and D, and after grinding, polishing, and metallographic etching, the results could be observed under a microscope, for example... Figure 4A The image shown is a micrograph of the weld pool, in which the dashed line indicates the approximate boundary of the weld pool 116. It can be seen that the microstructure of the weld pool 116 is roughly funnel-shaped.

[0116] In some embodiments, during the fabrication of the rear shell member 100, since other structural features need to be processed after the welding process, the aforementioned generally funnel-shaped molten pool microstructure may only be partially observable due to the removal of some material during processing. For example, in some embodiments of the present application, the rear shell member 100 may exhibit... Figure 2A After sectioning at point C and sequentially performing grinding, polishing, and metallographic etching, it is possible to observe, for example... Figure 4B The molten pool features shown are illustrated, with the dashed line indicating the approximate boundary of molten pool 116. It can be seen that it retains some of the microstructure features of a roughly funnel-shaped molten pool.

[0117] In some embodiments, during the manufacturing process of the rear shell component 100, in order to improve the mechanical properties of the rear shell component 100, the rear shell component 100 may be further subjected to heat treatment. Thus, for the actual product of the rear shell component 100, in for example... Figure 2A After sectioning at point C and sequentially performing grinding, polishing, and metallographic etching, it is possible to observe, for example... Figure 4C The molten pool features shown, in, for example Figure 2A After sectioning at point D and sequentially performing grinding, polishing, and metallographic etching, it is possible to observe, for example... Figure 4D The molten pool characteristics shown are in Figure 4C and Figure 4D In the diagram, the dashed line indicates the approximate boundary of the molten pool 116. (As shown...) Figure 4C As shown, the microstructure of the roughly funnel-shaped molten pool is partially observable under a microscope due to the removal of some material during processing. Although the inner and outer grains of molten pool 116 have grown or deformed to some extent after heat treatment, at least some features of the roughly funnel-shaped molten pool boundary are still retained in the metallographic representation. Figure 4D As shown, although the inner and outer grains of the roughly funnel-shaped molten pool 116 grow or deform to some extent after heat treatment, the metallographic model still retains the roughly funnel-shaped boundary traces of the molten pool.

[0118] In the embodiments of this application, the specific shapes of the border portion 11 and the back plate portion 12 are not limited.

[0119] For example, in some embodiments of this application, the back plate portion 12 may be connected to all periphery portions of the frame portion 11. For example... Figure 1 In the embodiment shown, the frame portion 11 is generally in the shape of a rounded rectangle, which includes a first frame edge 111, a second frame edge 112, a third frame edge 113 and a fourth frame edge 114 connected in sequence, wherein the back plate portion 12 is integrally connected to the first frame edge 111, the second frame edge 112, the third frame edge 113 and the fourth frame edge 114.

[0120] For example, in some other embodiments of this application, the frame portion can be divided into a first frame edge portion and a second frame edge portion, wherein the back panel portion is connected to the first frame edge portion but not connected to the second frame edge portion, and the second frame edge portion can be used to connect the decorative surface layer of the back cover of the mobile terminal. Figure 5The diagram shown is a schematic representation of the back appearance of a mobile terminal 400 according to some embodiments of this application. It can be seen that in these embodiments, the frame portion 11 is generally a rounded rectangular frame, comprising a first frame edge 111, a second frame edge 112, a third frame edge 113, and a fourth frame edge 114 connected sequentially. The back panel portion 12 is integrally connected to a portion of the first frame edge 111, a portion of the third frame edge 113, and the fourth frame edge 114 (i.e., the back panel portion 12 is integrally connected to the aforementioned first frame edge portion of the frame portion 11). In these embodiments, the portions of the first frame edge 111 not connected to the back panel portion 12, the second frame edge 112, and the third frame edge 113 not connected to the back panel portion 12 (i.e., the aforementioned second frame edge portion of the frame portion 11) can be used to connect to the rear shell decorative surface layer 13 of the mobile terminal 400. The rear shell decorative surface layer 13 can be, for example, a leather-textured decorative surface layer, a wood-textured decorative surface layer, or a fabric-textured decorative surface layer, etc., and this application does not specifically limit this.

[0121] For example, in some other embodiments of this application (not shown in the accompanying drawings), the frame portion may also be in the shape of a circular frame or a regular polygonal frame, and the back plate portion may be integrally connected to at least a portion of the frame portion. The back shell components of these embodiments can be applied in smart terminal products such as wearable devices.

[0122] This application does not specifically limit the material and material structure composition of the rear shell body 10.

[0123] like Figure 2A and Figure 2B As shown, in some embodiments of this application, the rear shell body 10 may adopt a composite structure layer design, wherein the frame portion 11 and the back plate portion 12 both include a first metal layer 102 and a second metal layer 103 that are compositely connected. The first metal layer 102 is located on the side of the second metal layer 103 that is away from the receiving cavity. Furthermore, the main elements of the first metal layer 102 and the second metal layer 103 are different, and the support structure 30 is the same as the main element of the second metal layer 103.

[0124] In this application, "the main elements of the first metal layer 102 and the second metal layer 103 are different" can be understood as the main metal elements of the two materials being different. The back shell body 10 is made of two metal materials with different main elements, which can combine the material advantages of both.

[0125] In this application, "the main elements of the support structure 30 and the second metal layer 103 are the same" can be understood as the main metal elements of the two materials being the same, while other added elements may be the same or different. Having the same main elements as the second metal layer 103 reduces or even avoids weld weaknesses caused by differences in thermal conductivity and linear expansion coefficients compared to using materials with different main elements.

[0126] The specific materials chosen for the first metal layer 102 and the second metal layer 103 are not limited. For example, in some embodiments, the material of the first metal layer 102 is titanium, titanium alloy, or stainless steel, and the material of the second metal layer 103 is aluminum alloy, and the material of the support structure 30 is aluminum alloy. For example, the first metal layer 102 and the second metal layer 103 can be respectively: a titanium layer and an aluminum alloy layer, a titanium alloy layer and an aluminum alloy layer, or a stainless steel layer and an aluminum alloy layer, etc. Both the support structure 30 and the second metal layer 103 are made of aluminum alloy, and they can be aluminum alloys of the same series or aluminum alloys of different series. For example, in some embodiments, the support structure 30 and the second metal layer 103 are respectively: a six-series aluminum alloy (the main element is aluminum, and the added elements include magnesium and silicon) and a seven-series aluminum alloy (the main element is aluminum, and the added elements include zinc), or a six-series aluminum alloy and a six-series aluminum alloy, etc.

[0127] Among the materials listed above, titanium has the characteristics of good corrosion resistance, high strength, and light weight; titanium alloys have the characteristics of good corrosion resistance, high strength, and good toughness; steel has the characteristics of high strength, good wear resistance, easy processing, and low cost; aluminum alloys have the characteristics of low density, good mechanical properties, good processing performance, non-toxicity, easy recycling, and excellent thermal conductivity and corrosion resistance.

[0128] In some embodiments of this application, the thickness of the first metal layer 102 can be designed to be less than the thickness of the second metal layer 103, and the hardness of the first metal layer 102 is greater than the hardness of the second metal layer 103. In this way, the rear shell member 100 not only has good surface wear resistance but also meets the structural strength design requirements. Designing the thickness of the second metal layer 103 to be greater than the thickness of the first metal layer 102 makes it easier to achieve a reliable connection between the support structure 30 and the frame portion 11 and the back plate portion 12, and also makes the support structure 30 easier to manufacture.

[0129] The specific thickness of the first metal layer 102 and the second metal layer 103 is not limited. For example, in some embodiments, the thickness of the first metal layer 102 is designed to be no more than 0.3 mm and the thickness of the second metal layer 103 is designed to be no more than 0.7 mm. Although the overall thickness of the rear shell body 10 is no more than 1 mm, the design of the support structure 30 can significantly increase the overall structural strength of the rear shell component 100, so that the rear shell component 100 still has good structural reliability.

[0130] In some embodiments of this application, the side of the first metal layer 102 facing away from the second metal layer 103 may also have a surface treatment layer (not shown in the figure). The surface treatment layer can improve the wear resistance, corrosion resistance, stain resistance, or fingerprint resistance of the surface of the back cover component, and can also improve the appearance of the back cover component, thereby making the product design more competitive. In some embodiments, the surface treatment layer can be formed by processes such as physical vapor deposition (PVD).

[0131] In some embodiments of this application, the rear shell body 10 may not use a composite structure layer, but a single metal layer, such as an aluminum alloy layer or a stainless steel layer, etc. This application does not make specific limitations on this.

[0132] like Figure 6A and Figure 6B As shown, where, Figure 6A This is a simplified front view of the rear shell member 100 according to some embodiments of this application. Figure 6B For the rear shell member 100 according to some embodiments of this application along Figure 6A A schematic diagram of the cross-sectional structure cut along the BB direction. In these embodiments, the support structure 30 is integrally connected to the inner wall of the back plate portion 12, and the frame portion 11 includes a plurality of splicing segments 110 assembled in a frame shape, wherein the back plate portion 12 is assembled with the plurality of splicing segments 110, and the support structure 30 is welded to the inner wall of each splicing segment 110.

[0133] The rear shell component 100 of this embodiment not only achieves similar beneficial effects to the aforementioned embodiments, but its processing and manufacturing are also simpler, which helps to save raw materials and reduce production costs.

[0134] like Figure 6B As shown, the back panel 12 and the splicing section 110 can be spliced ​​in a stepped manner, that is, the splicing surface between the two is stepped. The advantages of this design are that, on the one hand, it is easy for the two to be aligned with each other, which is conducive to improving the assembly accuracy; on the other hand, it can reduce the amount of dust entering from this point after assembly, thereby improving the production yield; and on the other hand, it can also make the appearance of the spliced ​​structure more beautiful.

[0135] Continue to refer to Figure 6A and Figure 6B As shown, in some embodiments, both the frame portion 11 and the back plate portion 12 include a first metal layer 102 and a second metal layer 103 that are compositely connected. The support structure 30 and the second metal layer 103 of the frame portion 11 can be connected by friction stir welding in the XY direction (the Y direction is not shown because it is perpendicular to the paper).

[0136] like Figure 6BAs shown in the figure, the figure also illustrates the general shape of the molten pool 116 in the friction stir welding process. It can be seen that the molten pool 116 can extend downward along the Z direction. Thus, through the friction stir welding process, the second metal layer 103 of the frame portion 11 and the second metal layer 103 of the back plate portion 12 can also achieve a Z-direction welding connection at some positions.

[0137] In some embodiments, such as Figure 6B As shown, a gap 115 for electromagnetic waves to pass through is provided between the back panel 12 and at least one of the splicing segments 110. This facilitates the design of the antenna system for the mobile terminal. In these embodiments, the gap 115 may specifically be a gap between the cross-section of the first metal layer 102 of the splicing segment 110 and the first metal layer 102 and the second metal layer 103 of the back panel 12. In some embodiments, the gap 115 may be filled with a decorative material, such as plastic, that does not affect the passage of electromagnetic waves. In other embodiments, the gap 115 may not be filled.

[0138] like Figure 6C As shown, it is the rear shell member 100 according to some other embodiments of this application along... Figure 6A A schematic diagram of the cross-sectional structure cut along the BB direction; these embodiments are similar to... Figure 6B The difference in the illustrated embodiment is that the gap 115 through which electromagnetic waves pass is the gap between the cross section of the first metal layer 102 of the splicing segment 110 and the first metal layer 102 of the back plate portion 12. Similarly, the gap 115 can be filled with decorative material that does not affect the passage of electromagnetic waves, or it can be left unfilled.

[0139] The rear shell component 100 of the above embodiments of this application can be implemented through various manufacturing processes.

[0140] like Figure 7A and Figure 7B As shown, where, Figure 7A This is a schematic flowchart of a method 700 for manufacturing a rear shell member 100 according to some embodiments of this application. Figure 7B This is a schematic diagram illustrating the manufacturing process of the rear shell member 100 in these embodiments. The manufacturing method 700 may include the following steps S701 to S703.

[0141] In step S701, a rear shell body 10 is provided, the rear shell body 10 including a side frame portion 11 and a back plate portion 12, the side frame portion 11 and the back plate portion 12 are integrally connected and define a receiving cavity 101.

[0142] In step S702, a middle plate 300a is provided, the middle plate 300a is welded to the inner wall of the frame portion 11, and the middle plate 300a is welded to the inner wall of the back plate portion 12.

[0143] In step S703, a portion of the material of the middle plate 300a is removed, while retaining at least a portion of the welded structure between the middle plate 300a and the frame portion 11, and at least a portion of the welded structure between the middle plate 300a and the back plate portion 12, to obtain a support structure 30. The support structure 30 is welded to both the inner wall of the frame portion 11 and the inner wall of the back plate portion 12. Furthermore, the support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100. Figure 7B The structure of the rear shell body 10 is shown in a simplified schematic diagram. The actual structure of the rear shell body 10 is not limited to this structural form.

[0144] By using the manufacturing method 700 of the above embodiments of this application, for example, it is possible to produce... Figure 1 The rear shell component 100 shown is used in a mobile terminal and can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure 30 is welded to the inner wall of the frame portion 11 and the inner wall of the back plate portion 12, that is, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, the structural strength of the rear shell component 100 can be improved, which is conducive to improving the product structure reliability of the mobile terminal. In addition, since the support structure 30 is obtained by removing part of the material of the middle plate 300a, it is not only easier to process and manufacture, but also easier to obtain accurate structural parameters, thereby further improving the assembly reliability of electronic components in the mobile terminal.

[0145] Reference Figure 7B As shown, in some embodiments of this application, in step S701, a rear shell body 10 is provided, which may include the following sub-steps S7011 and S7012.

[0146] In sub-step S7011, a composite plate 410 is provided, the composite plate 410 including a first metal layer 102 and a second metal layer 103 with different main elements.

[0147] In some embodiments, the first metal layer 102 and the second metal layer 103 can be sequentially processed by surface treatment, lamination, rolling and diffusion processes to form a composite plate 410. The surface treatment process may include cleaning the surface and removing the surface oxide layer, the rolling process may include hot rolling and cold rolling, and the diffusion process may include diffusion annealing.

[0148] In some embodiments, the first metal layer 102 and the second metal layer 103 may also be formed into a composite plate 410 by sequentially performing processes such as surface treatment, lamination and explosive welding. Explosive welding is a method of welding that uses the impact force generated by the explosion of explosives to cause the workpiece to collide rapidly.

[0149] Regarding the material selection for the first metal layer 102 and the second metal layer 103, please refer to the aforementioned description of the embodiment of the rear shell component 100, which will not be repeated here.

[0150] In sub-step S7012, the composite sheet 410 is formed into a rear shell body 10 having a receiving cavity 101, wherein the first metal layer 102 is located on the side of the second metal layer 103 facing away from the receiving cavity 101. In this sub-step S7012, the composite sheet 410 can be specifically formed into a rear shell body 10 having a receiving cavity 101 by a stamping process.

[0151] Continue to refer to Figure 7B As shown, in some embodiments of this application, in step S702, before welding the middle plate 300a to the rear shell body 10, the middle plate 300a can be pre-fixed in the receiving cavity 101 of the rear shell body 10 by means of a jig (not shown in the figure) or by applying glue (not shown in the figure).

[0152] Continue to refer to Figure 7B As shown, in some embodiments of this application, in step S702, when welding the middle plate 300a to the rear shell body 10, the middle plate 300a can first be welded to the inner wall of the frame portion 11 along the first preset welding trajectory line 301 using friction stir welding. Then, the middle plate 300a can be welded to the inner wall of the back plate portion 12 along the second preset welding trajectory line 302 using friction stir welding. Alternatively, the middle plate 300a can first be welded to the inner wall of the back plate portion 12 along the second preset welding trajectory line 302 using friction stir welding, and then the middle plate 300a can be welded to the inner wall of the frame portion 11 along the first preset welding trajectory line 301 using friction stir welding. Friction stir welding can achieve welds with lower defects, and it produces almost no welding fumes and spatter, and has virtually no ultraviolet or electromagnetic radiation. It also has strong compatibility with welding parameters and welding materials.

[0153] The first preset welding trajectory line 301 and the second preset welding trajectory line 302 can be designed according to the specific structural dimensions of the supporting structure 30. They are only simplified in the figure and are not used to represent the actual design. For example, in some embodiments, the first preset welding trajectory line 301 can be a closed shape, a line segment shape, or a combination of multiple line types; the second preset welding trajectory line 302 can be a closed shape, a line segment shape, or a combination of multiple line types.

[0154] In some embodiments of this application, the middle plate 300a may also be welded to the frame portion 11 and the back plate portion 12 using other welding processes, and this application does not specifically limit this.

[0155] In some embodiments of this application, in step S703, the removal of a portion of the material from the middle plate 300a can be achieved using a computer numerical control (CNC) milling machine. A CNC is a program-controlled automated machine tool characterized by high machining accuracy, high efficiency, and high reliability. Using a CNC, a support structure 30 with high dimensional accuracy can be formed.

[0156] In step S703, during the process of removing part of the material of the middle plate 300a, at least a portion of the welded structure between the middle plate 300a and the frame portion 11, and at least a portion of the welded structure between the middle plate 300a and the back plate portion 12 are retained. As a result, the obtained support structure 30 is welded to the inner wall of the frame portion 11 and the inner wall of the back plate portion 12. That is, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, which makes the structural strength of the rear shell component 100 higher.

[0157] In some embodiments of this application, after completing step S703 above, the rear shell component 100 can be further processed by other processes, including but not limited to: processing some hole and groove structures of the rear shell component 100 by CNC process, such as camera module mounting holes, flash mounting holes, sensor mounting holes, USB holes, etc.; processing other structures of the rear shell component 100 by nano molding technology (NMT); and forming a surface treatment layer, such as a decorative surface layer, on the outer surface of the rear shell component 100 by PVD process.

[0158] like Figure 8A and Figure 8B As shown, where, Figure 8A This is a schematic flowchart of a method 800 for manufacturing a rear shell member 100 according to some embodiments of this application. Figure 8B This is a schematic diagram illustrating the manufacturing process of the rear shell member 100 in these embodiments. The manufacturing method 800 may include the following steps S801 to S805.

[0159] In step S801, a sheet metal part 420 is provided.

[0160] In step S802, a portion of the material thickness of the peripheral area of ​​the sheet metal part 420 is removed to obtain a first part 501 and a second part 502 with different thicknesses, wherein the first part 501 surrounds the second part 502, and the thickness of the first part 501 is less than the thickness of the second part 502.

[0161] In step S803, the first part 501 is folded toward the second part 502 and attached to the second part 502.

[0162] In step S804, the sidewalls of the first part 501 and the second part 502 are welded together.

[0163] In step S805, some material of the second part 502 is removed and at least a portion of the welded structure of the first part 501 and the second part 502 is retained to obtain the rear shell body 10 and the support structure 30. The rear shell body 10 includes a frame portion 11 and a back plate portion 12 integrally connected and defining the receiving cavity 101. The support structure 30 is located in the receiving cavity 101 and is welded to the inner wall of the frame portion 11 and integrally connected to the inner wall of the back plate portion 12. The support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100.

[0164] By using the manufacturing method 800 of the above embodiments of this application, for example, it is possible to produce... Figure 1 The rear shell component 100 shown is used in a mobile terminal and can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure 30 is welded to the inner wall of the frame portion 11 and integrally connected to the inner wall of the back plate portion 12, that is, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, the structural strength of the rear shell component 100 can be improved, which is conducive to improving the product structure reliability of the mobile terminal. In addition, since the support structure 30 is obtained by removing part of the material of the second part 502, it is not only easier to process and manufacture, but also easier to obtain accurate structural parameters, thereby further improving the assembly reliability of electronic components in the mobile terminal.

[0165] In some embodiments of this application, reference is made to Figure 8B As shown, in step S801, providing a sheet metal component 420 may include providing a composite sheet metal 410, wherein the composite sheet metal 410 includes a first metal layer 102 and a second metal layer 103 with different main elements. The first metal layer 102 and the second metal layer 103 may be sequentially formed into the composite sheet metal 410 through processes such as surface treatment, lamination, rolling, and diffusion. Regarding the material selection of the first metal layer 102 and the second metal layer 103, please refer to the aforementioned description of the embodiment regarding the rear shell component 100, which will not be repeated here.

[0166] Reference Figure 8BAs shown, in step S802, removing a portion of the thickness of the material from the peripheral region of the sheet metal part 420 may include removing a portion of the thickness of the material from the peripheral region of the second metal layer 103. That is, after completing step S802, a first part 501 and a second part 502 with different thicknesses can be obtained. The first part 501 surrounds the second part 502, and both the first part 501 and the second part 502 include a first metal layer 102 and a second metal layer 103. However, the thickness of the second metal layer 103 in the first part 501 is less than the thickness of the second metal layer 103 in the second part 502, thereby making the overall thickness of the first part 501 less than the overall thickness of the second part 502.

[0167] In some embodiments of this application, in step S803, the first part 501 is folded toward the second part 502 and attached to the second part 502, which can be achieved by stretching and bending sheet metal using a stamping device.

[0168] Continue to refer to Figure 8B As shown, in some embodiments of this application, the manufacturing method 800 may further include: after step S803 and before step S804, removing a portion of the material from the first portion 501 and / or the second portion 502 so that the first portion 501 and the second portion 502 are flush. Adding this step can, on the one hand, appropriately reduce the dimensional accuracy requirements for providing the sheet metal part 420 in step S801, the material processing accuracy requirements for removing the material from the surrounding area of ​​the sheet metal part 420 in step S802, or the forming accuracy requirements for stretching and bending in step S803; on the other hand, it can also obtain intermediate preforms with higher precision.

[0169] Continue to refer to Figure 8B As shown, in some embodiments of this application, in step S804, when welding the sidewalls of the first part 501 and the second part 502, the sidewalls of the first part 501 and the second part 502 can be welded along a preset welding trajectory line 503 using a friction stir welding process. In some embodiments, the preset welding trajectory line 503 can be a closed shape, so that the first part 501 and the second part 502 are welded at various points around the perimeter. In some embodiments, the preset welding trajectory line can also be a line segment shape, so that the first part 501 and the second part 502 are only welded in areas where local design is required.

[0170] In some embodiments of this application, the first part 501 and the second part 502 may also be welded using other welding processes, and this application does not specifically limit this.

[0171] In some embodiments of this application, removing a portion of the material thickness from the peripheral area of ​​the sheet metal part 420, or removing a portion of the material from the first part 501 and / or the second part 502, can be achieved using CNC machining.

[0172] In step S805, during the process of removing part of the material of the second part 502, at least a part of the welded structure of the first part 501 and the second part 502 is retained. As a result, the obtained support structure 30 is welded to the inner wall of the frame part 11. Since the support structure 30 is integrally connected to the inner wall of the back plate part 12, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, resulting in a high structural strength of the rear shell component 100.

[0173] After completing step S805 above, the rear shell component 100 can be further processed by other processes, including but not limited to: processing some hole and groove structures of the rear shell component 100 by CNC process, such as camera module mounting holes, flash mounting holes, sensor mounting holes, USB holes, etc.; processing other structures of the rear shell component 100 by NMT process; and forming a surface treatment layer, such as a decorative surface layer, on the outer surface of the rear shell component 100 by PVD process.

[0174] like Figure 9A and Figure 9B As shown, where, Figure 9A This is a schematic flowchart of a method 900 for manufacturing a rear shell member 100 according to some embodiments of this application. Figure 9B This is a schematic diagram illustrating the manufacturing process of the rear shell member 100 in these embodiments. The manufacturing method 900 may include the following steps S901 to S903.

[0175] In step S901, a middle plate 300b and a plurality of splicing segments 110 are provided.

[0176] In step S902, multiple splicing segments 110 are assembled into a frame portion 11, and the middle plate 300b is welded to the inner wall of the frame portion 11.

[0177] In step S903, a portion of the material of the middle plate 300b is removed while retaining at least a portion of the welded structure between the middle plate 300b and the frame portion 11 to obtain the rear shell body 10 and the support structure 30. The rear shell body 10 includes a back plate portion 12 and a frame portion 11 defining a receiving cavity 101. The support structure 30 is located within the receiving cavity 101 and is welded to the inner wall of the frame portion 11 and integrally connected to the inner wall of the back plate portion 12. The support structure 30 and the rear shell body 10 together define at least one positioning recess 31 on the inner side of the rear shell member 100.

[0178] like Figure 9BAs shown, in some embodiments of this application, in step S901, the middle plate 300b and the plurality of splicing segments 110 can be obtained from the composite board 410 through cutting and bending or CNC machining. For example, in some embodiments, after cutting the composite board 410, the middle plate 300b and a plurality of strips can be obtained, and bending the plurality of strips can obtain the corresponding plurality of splicing segments 110. Figure 9B As shown, the composite board 410 may include a first metal layer 102 and a second metal layer 103 with different main elements. The material selection and manufacturing process of the composite board 410 are described in the foregoing embodiments and will not be repeated here. In some embodiments of this application, the mating surfaces of the middle plate 300b and the multiple splicing segments 110 can be processed into a stepped shape. This not only facilitates mutual alignment and improves assembly accuracy, but also reduces dust entry after assembly, thereby improving the production yield; furthermore, it makes the assembled structure more aesthetically pleasing.

[0179] In some embodiments of this application, in step S902, before welding the middle plate 300b to the multiple splicing segments 110, the middle plate 300b and the multiple splicing segments 110 can be pre-fixed using a clamp (not shown in the figure) or by applying glue (not shown in the figure).

[0180] In some embodiments of this application, in step S902, welding the middle plate 300b to the inner wall of the frame portion 11 may include welding the middle plate 300b to the inner wall of the frame portion 11 along a preset welding trajectory line 503 using a friction stir welding process. In some embodiments, the preset welding trajectory line 503 may be closed in shape, so that the middle plate 300b and the frame portion 11 are welded at various points around the perimeter. In some embodiments, the preset welding trajectory line may also be line segment in shape, so that the middle plate 300b and the frame portion 11 are welded only in areas where local design is required.

[0181] By using the manufacturing method 900 of the above embodiments of this application, for example, it is possible to produce... Figure 6A The rear shell component 100 shown is used in a mobile terminal and can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure 30 is welded to the inner wall of the frame portion 11 and integrally connected to the inner wall of the back plate portion 12, that is, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, the structural strength of the rear shell component 100 can be improved, which is conducive to improving the product structure reliability of the mobile terminal. In addition, since the middle plate 300b and the multiple splicing segments 110 can be obtained from sheet metal parts through cutting and bending or CNC machining, it is convenient to process and manufacture parts, which helps to save raw materials and reduce production costs.

[0182] After completing step S903 above, the rear shell component 100 can be further processed by other processes, including but not limited to: processing some hole and groove structures of the rear shell component 100 by CNC process, such as camera module mounting holes, flash mounting holes, sensor mounting holes, USB holes, etc.; processing other structures of the rear shell component 100 by NMT process; and forming a surface treatment layer, such as a decorative surface layer, on the outer surface of the rear shell component 100 by PVD process.

[0183] like Figure 10 As shown, it is a flowchart of a method 1000 for manufacturing a rear shell member 100 according to some other embodiments of the present application. The manufacturing method may include the following steps S1001 to S1002.

[0184] In step S1001, a rear shell body is provided, the rear shell body including a side frame portion and a back plate portion, the side frame portion and the back plate portion being integrally connected and defining a receiving cavity.

[0185] In step S1002, a support structure is provided, which is welded to the inner wall of the frame portion and to the inner wall of the back plate portion. The support structure is a die-cast part, and the support structure and the rear shell body together define at least one positioning recess on the inner side of the rear shell member.

[0186] Regarding the fabrication of the rear shell body in step S1001, please refer to the description in the foregoing embodiments, which will not be repeated here.

[0187] In some embodiments, the rear shell body may include a first metal layer and a second metal layer, wherein the first metal layer is located on the side of the second metal layer opposite to the receiving cavity. The second metal layer and the support structure may be made of the same or different aluminum alloys, wherein the material of the support structure may include, but is not limited to, die-cast aluminum alloys (material types such as ADC10, ADC12, or YZAlSi12, etc.) or high thermal conductivity die-cast aluminum alloys (material types such as DMS1, DMS3, DMS5, DMS6, or LZTH-HTC01, etc.).

[0188] Support structures can be formed using die casting or semi-solid die casting processes. Die casting is a precision casting method that uses high pressure to force molten metal into a complex-shaped metal mold. Semi-solid die casting involves intense stirring during the solidification of molten metal, breaking down the dendritic network framework that is easily formed in ordinary casting into a dispersed granular structure, thus creating a semi-solid molten metal, which is then die-cast into a billet or casting. Using die casting or semi-solid die casting processes to produce support structures allows for the direct formation of the basic components with high dimensional accuracy, reducing or even eliminating secondary machining processes, resulting in high production efficiency.

[0189] By using the manufacturing method 1000 of the above embodiments of this application, for example, it is possible to produce... Figure 1 The rear shell component 100 shown is used in a mobile terminal and can provide reliable positioning for the electronic components of the mobile terminal, thereby reducing the assembly design difficulty of these electronic components, improving their assembly reliability, and thus improving the product structure reliability of the mobile terminal. Since the support structure is welded to the inner wall of the frame and the inner wall of the back plate, that is, the support structure is connected to the rear shell body in both the XY and Z directions, the structural strength of the rear shell component can be improved, which is conducive to improving the product structure reliability of the mobile terminal. In addition, since the support structure is a die-cast part, not only is the production efficiency high, but it is also easy to obtain accurate structural parameters, which is conducive to further improving the assembly reliability of electronic components in the mobile terminal.

[0190] This application also provides a mobile terminal. For example... Figure 11 The diagram shows a cross-sectional view of a mobile terminal 400 according to some embodiments of this application. The main structure of the mobile terminal 400 may include a rear shell member 100, a motherboard 41, a battery 43, and a display screen 105. The rear shell member 100 may be a rear shell member designed using the structure described in the foregoing embodiments, or a rear shell member 100 manufactured according to the manufacturing method described in the foregoing embodiments. The support structure 30 and the rear shell body 10 together define at least two positioning recesses 31 on the inner side of the rear shell member 100. These at least two positioning recesses 31 may include a motherboard positioning recess 311 and a battery positioning recess 312. The motherboard 41 and the battery 43 are correspondingly located in the motherboard positioning recess 311 and the battery positioning recess 312. The display screen 105 is located in front of the motherboard 41 and the battery 43 and is connected to the frame portion 11.

[0191] In this embodiment, the specific product type of the mobile terminal 400 may include, but is not limited to, mobile phones, tablet computers, personal computers, wearable devices, etc. The motherboard 41, also known as the host board or system board, is one of the core components inside the mobile terminal 400, and it may mainly include a processor, memory and storage modules, communication modules, etc.

[0192] like Figure 11 As shown, in some embodiments, the mobile terminal 400 may further include a sub-board 42, a camera module, a flash, a laser focus sensor, an ambient light sensor, a speaker, an earpiece, a microphone, a wireless charging module, a chip card, or a motor (these electronic components are not shown in the figure). The sub-board 42 in the mobile terminal 400 is mainly used to connect the mainboard 41 and some external accessories.

[0193] By designing the support structure 30 accordingly, the support structure 30 and the back shell body 10 as a whole can define positioning recesses 31 that match multiple electronic components 104, thereby providing more flexible and richer design options for the assembly of electronic components 104 of the mobile terminal 400.

[0194] According to the embodiments of this application, the mobile terminal 400 has the following advantages: First, the positioning recess 31 of the rear shell component 100 can provide reliable positioning for the electronic component 104 of the mobile terminal 400, thereby reducing the assembly design difficulty of the electronic component 104, improving its assembly reliability, and thus improving the product structure reliability of the mobile terminal 400. Second, since the support structure 30 of the rear shell component 100 is welded to the inner wall of the frame portion 11 and welded to or integrally connected to the inner wall of the back plate portion 12, that is, the support structure 30 is connected to the rear shell body 10 in both the XY and Z directions, the overall structural strength of the rear shell component 100 is high, and the product structure reliability of the mobile terminal 400 is high. Third, the processing and manufacturing of the rear shell component 100 can be achieved through various process schemes (as described in the previous embodiments), which is beneficial to improving manufacturing accuracy and reducing the manufacturing cost of the mobile terminal 400.

[0195] For reference Figure 1 As shown, in some embodiments of this application, the frame portion 11 of the rear shell component 100 of the mobile terminal 400 can be generally in the shape of a rounded rectangular frame, which includes a first frame edge 111, a second frame edge 112, a third frame edge 113 and a fourth frame edge 114 connected in sequence, wherein the back plate portion 12 is integrally connected to the first frame edge 111, the second frame edge 112, the third frame edge 113 and the fourth frame edge 114.

[0196] refer to Figure 5As shown, in some other embodiments of this application, the frame portion 11 of the mobile terminal 400 may be generally in the shape of a rounded rectangle, comprising a first frame edge 111, a second frame edge 112, a third frame edge 113, and a fourth frame edge 114 connected in sequence. The back panel portion 12 is integrally connected to a portion of the first frame edge 111, a portion of the third frame edge 113, and the fourth frame edge 114 (i.e., the back panel portion 12 is integrally connected to the aforementioned first frame edge portion of the frame portion 11). In these embodiments, the portions of the first frame edge 111 not connected to the back panel portion 12, the second frame edge 112, and the third frame edge 113 not connected to the back panel portion 12 (i.e., the aforementioned second frame edge portion of the frame portion 11) can be used to connect to the rear shell decorative surface layer 13 of the mobile terminal 400.

[0197] The back cover decorative surface 13 can be, for example, a leather-like decorative surface, a wood-like decorative surface, or a fabric-like decorative surface, etc., and this application does not specifically limit it. In these embodiments, the outer surface of the portion where the frame portion 11 connects to the back panel portion 12, and the outer surface of the portion where the frame portion 11 connects to the back cover decorative surface 13, can have plating with consistent or inconsistent appearance styles, thereby making the back cover of the mobile terminal 400 more harmonious and aesthetically pleasing.

[0198] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A back cover member (100) for a mobile terminal, characterized in that, The back shell body (10) comprises a frame part (11) and a back plate part (12), wherein the frame part (11) and the back plate part (12) define a receiving cavity (101); and A support structure (30) is arranged in the receiving cavity (101), wherein the support structure (30) is welded with the inner wall of the frame part (11), the support structure (30) is welded or integrally connected with the inner wall of the back plate part (12), and the whole of the support structure (30) and the back shell body (10) defines at least one positioning recess (31) on the inner side of the back shell member (100). The support structure comprises:

2. The rear housing member (100) according to claim 1, characterized in that A first protruding structure (32) welded with the inner wall of the frame part (11); and A second protruding structure (33) welded or integrally connected with the inner wall of the back plate part (12).

3. The back shell member (100) according to claim 2, wherein The first protruding structure (32) and the inner wall of the back plate part (12) are not connected with each other; or The first protruding structure (32) and the inner wall of the back plate part (12) are integrally connected; or At least a part of the first protruding structure (32) is welded with the inner wall of the back plate part (12).

4. The back shell member (100) according to claim 2 or 3, wherein At least a part of the first protruding structure (32) is in a strip shape; At least a part of the second protruding structure (33) is in a strip shape, or at least a part of the second protruding structure (33) is in a boss shape.

5. The back shell member (100) according to any one of claims 1 to 4, wherein The whole of the support structure (30) and the back shell body (10) defines a plurality of positioning recesses (31) on the inner side of the back shell member (100), and among the plurality of positioning recesses (31), The normal projections of at least two positioning recesses (31) on the back plate part (12) do not overlap with each other; and / or At least two positioning recesses (31) are arranged in a direction orthogonal to the back plate part (12), and among the at least two positioning recesses (31), the normal projection of one positioning recess (31) on the back plate part (12) overlaps with the normal projection of another positioning recess (31) on the back plate part (12).

6. The back shell member (100) according to any one of claims 1 to 5, wherein The support structure (30) is integrally connected with the inner wall of the back plate part (12); The frame part (11) comprises a plurality of spliced segments (110) spliced in a frame shape, wherein the back plate part (12) is spliced with the plurality of spliced segments (110), and the support structure (30) is welded with the inner wall of each spliced segment (110) of the plurality of spliced segments (110).

7. The back shell member (100) according to claim 6, wherein There is a gap (115) for electromagnetic waves to pass between the back plate part (12) and at least one spliced segment (110) of the plurality of spliced segments (110). ​ 8. The rear shell member (100) according to any one of claims 1 to 7, characterized in that, the back plate portion (12) is connected with each part of the perimeter of the frame portion (11); or the frame portion (11) comprises a first frame edge portion and a second frame edge portion, wherein the back plate portion (12) is connected with the first frame edge portion and is not connected with the second frame edge portion, and the second frame edge portion is used for connecting a rear shell decoration surface layer of the mobile terminal.

9. The rear shell member (100) according to any one of claims 1 to 8, characterized in that, the at least one positioning recess (31) is used for limiting at least one electronic component (104) of the mobile terminal, and the at least one electronic component (104) comprises one or more of a main board, a sub-board, a camera module, a flash, a laser focusing sensor, an ambient light sensor, a loudspeaker, an earpiece, a microphone, a wireless charging module, a chip card, a motor, or a battery.

10. The rear shell member (100) according to any one of claims 1 to 9, characterized in that, the frame portion (11) and the back plate portion (12) each comprise a first metal layer (102) and a second metal layer (103) connected in a composite manner, wherein the first metal layer (102) is located on a side of the second metal layer (103) facing away from the accommodation cavity (101), and the main elements of the first metal layer (102) and the second metal layer (103) are different, and the support structure (30) is the same as the main element of the second metal layer (103).

11. The rear shell member (100) according to claim 10, characterized in that, the thickness of the first metal layer (102) is less than the thickness of the second metal layer (103), and the hardness of the first metal layer (102) is greater than the hardness of the second metal layer (103); and / or a side of the first metal layer (102) facing away from the second metal layer (103) has a surface treatment layer.

12. The rear shell member (100) according to claim 10 or 11, characterized in that, the material of the first metal layer (102) comprises titanium, a titanium alloy, or stainless steel; the material of the second metal layer (103) comprises an aluminum alloy; the material of the support structure (30) comprises an aluminum alloy.

13. A method of manufacturing a rear case member (100) for a mobile terminal, characterized by, including: providing a rear shell body (10) comprising a frame portion (11) and a back plate portion (12), wherein the frame portion (11) and the back plate portion (12) are integrally connected and define an accommodation cavity (101); providing a middle plate (300a) welded with an inner wall of the frame portion (11), and the middle plate (300a) is welded with an inner wall of the back plate portion (12); and Remove part of the material of the middle plate (300a) and retain at least part of the welding structure of the middle plate (300a) and the frame part (11), and at least part of the welding structure of the middle plate (300a) and the back plate part (12), to obtain a support structure (30), wherein the support structure (30) is welded with the inner wall of the frame part (11) and the inner wall of the back plate part (12), and the support structure (30) and the whole of the rear shell body (10) define at least one positioning recess (31) inside the rear shell member (100).

14. The manufacturing method of claim 13, wherein, Welding the middle plate (300a) and the inner wall of the frame part (11) includes welding the middle plate (300a) and the inner wall of the frame part (11) by friction stir welding along a first preset welding trajectory line (301); and / or Welding the middle plate (300a) and the inner wall of the back plate part (12) includes welding the middle plate (300a) and the inner wall of the back plate part (12) by friction stir welding along a second preset welding trajectory line (302).

15. The production method according to claim 13 or 14, characterized in that, The rear shell body is provided, including: Providing a composite plate (410) including a first metal layer (102) and a second metal layer (103) different in main elements; and Forming the composite plate (410) into a rear shell body (10) having a receiving cavity (101), wherein the first metal layer (102) is located on the side of the second metal layer (103) away from the receiving cavity (101).

16. A method of making a back cover member (100) for a mobile terminal, characterized by, Including: Providing a plate piece (420); Removing part of the thickness of the peripheral region of the plate piece (420) to obtain a first part (501) and a second part (502) different in thickness, wherein the first part (501) surrounds the second part (502), and the thickness of the first part (501) is less than the thickness of the second part (502); Folding the first part (501) towards the second part (502) and abutting the second part (502); Welding the first part (501) and the side wall of the second part (502); and Removing part of the material of the second part (502) and retaining at least part of the welding structure of the first part (501) and the second part (502) to obtain a rear shell body (10) and a support structure (30), wherein, The rear shell body (10) includes a frame part (11) and a back plate part (12) integrally connected and defining a receiving cavity (101), the support structure (30) is located in the receiving cavity (101) and is welded with the inner wall of the frame part (11) and integrally connected with the inner wall of the back plate part (12), the support structure (30) and the whole of the rear shell body (10) define at least one positioning recess (31) inside the rear shell member (100).

17. The method of manufacturing according to claim 16, wherein, Also including: After the first part (501) is folded towards the second part (502) and adheres to the second part (502), before the first part (501) and the side wall of the second part (502) are welded, part of the material of the first part (501) and / or the second part (502) is removed to make the first part (501) flush with the second part (502).

18. The method of manufacturing according to claim 16 or 17, wherein, Welding the first part (501) and the side wall of the second part (502) includes: Welding the first part (501) and the side wall of the second part (502) by a friction stir welding process along a preset welding trajectory (503).

19. The manufacturing method of any one of claims 16-18, wherein The providing of the plate member (420) includes providing a composite plate (410), the composite plate (410) including a first metal layer (102) and a second metal layer (103) different in main element; The removing of the part of the thickness of the material of the peripheral region of the plate member (420) includes removing the part of the thickness of the material of the peripheral region of the second metal layer (103).

20. A method for manufacturing a rear shell component (100) for a mobile terminal, characterized in that, Including: Providing a middle plate (300b) and a plurality of splicing segments (110); Splicing the plurality of splicing segments (110) into a frame portion (11), and welding the middle plate (300b) and an inner wall of the frame portion (11); and Removing part of the material of the middle plate (300b) and retaining at least part of the welding structure of the middle plate (300b) and the frame portion (11) to obtain a rear shell body (10) and a support structure (30), wherein The rear shell body (10) includes a back plate portion (12) and the frame portion (11) defining a receiving cavity (101), the support structure (30) is located in the receiving cavity (101) and is welded with the inner wall of the frame portion (11) and integrally connected with the inner wall of the back plate portion (12), and the support structure (30) and the whole of the rear shell body (10) define at least one positioning recess (31) inside the rear shell member (100).

21. The method of manufacturing according to claim 20, wherein, Welding the middle plate (300b) and the inner wall of the frame portion (11) includes: Welding the middle plate (300b) and the inner wall of the frame portion (11) by a friction stir welding process along a preset welding trajectory (503).

22. A method for manufacturing a rear shell component for a mobile terminal, characterized in that, Including: Providing a rear shell body, the rear shell body including a frame portion and a back plate portion, wherein the frame portion and the back plate portion are integrally connected and define a receiving cavity; and Providing a support structure, welding the support structure and an inner wall of the frame portion, and welding the support structure and an inner wall of the back plate portion, wherein the support structure is a die casting, and the support structure and the whole of the rear shell body define at least one positioning recess inside the rear shell member.

23. The manufacturing method of claim 22, wherein Welding the support structure with the inner wall of the frame portion includes: welding the support structure with the inner wall of the frame portion along a first preset welding track line by a friction stir welding process; and / or Welding the support structure with the inner wall of the back plate portion includes: welding the support structure with the inner wall of the back plate portion along a second preset welding track line by a friction stir welding process.

24. A mobile terminal (400), characterized by Comprise: A rear shell member (100), the rear shell member (100) is the rear shell member (100) according to any one of claims 1 to 12, or the rear shell member (100) is the rear shell member (100) prepared according to the manufacturing method of any one of claims 13 to 23, wherein the support structure (30) and the whole of the rear shell body (10) define at least two positioning recesses (31) on the inner side of the rear shell member (100), the at least two positioning recesses (31) include a mainboard positioning recess (311) and a battery positioning recess (312); A mainboard (41) and a battery (43) are correspondingly positioned in the mainboard positioning recess (311) and the battery positioning recess (312); And A display screen (105) is located on the front side of the mainboard (41) and the battery (43) and is connected with the frame portion (11).

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