Laser welding structure, mobile phone middle frame assembly and mobile phone

Abstract

The utility model relates to the technical field of laser welding, in particular to a laser welding structure, a mobile phone middle frame assembly and a mobile phone, the laser welding structure comprises a middle plate welding layer, a middle frame welding layer and a laser welding fusion layer, the middle frame welding layer and the middle plate welding layer are stacked, and the stacked part of the middle plate welding layer and the middle frame welding layer is of a rectangular structure; the laser welding fusion layer is connected with the middle plate welding layer and the middle frame welding layer and comprises at least two first welding sections and at least one second welding section; each first welding section is parallel to the length direction of the rectangular structure, and the at least two first welding sections are distributed at intervals in the width direction of the rectangular structure; a second welding section is connected between the single-side end parts of two adjacent first welding sections; the first welding section is longer than the second welding section. According to the arrangement, the connection strength of the laser welding structure of the mobile phone middle frame assembly can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser welding, in particular to a laser welding structure, a mobile phone middle frame assembly and a mobile phone. BACKGROUND

[0002] The mobile phone middle frame assembly comprises a middle frame and a middle plate, and a part of the middle plate is overlapped with a part of the middle frame and is welded by laser. At present, in the rectangular laser welding area formed by welding the middle frame and the middle plate, the middle line of the rectangular laser welding area in the length direction can be regarded as a "welding seam", and the laser welding machine makes a back-and-forth arch-shaped welding along the width direction to sew the "welding seam" in a way similar to sewing a patch on clothes. However, when the mobile phone middle frame assembly adopting the above laser welding structure is subjected to a pushing force, welding failure is likely to occur.

[0003] Therefore, how to improve the connection strength of the laser welding structure of the mobile phone middle frame assembly is a technical problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a laser welding structure, a mobile phone middle frame assembly and a mobile phone, which can improve the connection strength of the laser welding structure of the mobile phone middle frame assembly.

[0005] According to a first aspect of the present application, the embodiments of the present application provide a laser welding structure of a mobile phone middle frame assembly, comprising a middle plate welding layer; a middle frame welding layer arranged below the middle plate welding layer; a laser welding fusion layer arranged between the middle plate welding layer and the middle frame welding layer; the laser welding fusion layer has a whole rectangular profile and comprises at least two first welding segments and at least one second welding segment; each of the first welding segment and the second welding segment penetrates the middle plate welding layer upwards and penetrates the middle frame welding layer downwards; each of the first welding segments is arranged in parallel to the length direction of the rectangle; one second welding segment is connected between the single side end portions of two adjacent first welding segments; the length of the first welding segment is greater than the length of the second welding segment.

[0006] In the above embodiment, since the length direction of the first welding segment is arranged in parallel to the length direction of the rectangular structure, in the process of being subjected to a pushing force, the stress of the middle plate welding layer is mainly concentrated on the first welding segment, and the stress of the first welding segment is dispersed to each position in the length direction of the first welding segment instead of being concentrated on the end portion of the first welding segment, so that the connection strength between the middle plate welding layer and the middle frame welding layer is increased, and the middle plate welding layer and the middle frame welding layer are not prone to welding failure. In addition, due to the change of the length direction of the first welding segment, the position of the corner formed by the connection of the first welding segment and the second welding segment is changed, so that the corner is not subjected to the pushing force first, and the connection strength between the middle plate welding layer and the middle frame welding layer is further improved.

[0007] In at least one embodiment, the depth of the first welding section and the second welding section into the middle frame welding layer is in the range of 0.1mm to 0.3mm.

[0008] By setting the melting depth of the laser welding melting layer at the middle frame welding layer, the laser welding melting layer does not break through the middle frame welding layer, so as to improve the problem of poor connection strength between the middle frame welding layer and the middle plate welding layer caused by breaking through the middle frame welding layer and the middle plate welding layer at the same time.

[0009] In at least one embodiment, the length of the first welding section is in the range of 2mm to 4mm, and the length of the second welding section is in the range of 0.3mm to 0.9mm.

[0010] In the above embodiment, by setting the length of the first welding section and the second welding section, the first welding section and the second welding section have sufficient length to disperse the force in the process of the middle plate welding layer being subjected to the force, thereby increasing the connection strength between the middle plate welding layer and the middle frame welding layer, so that the middle plate welding layer and the middle frame welding layer are not easy to fail in welding.

[0011] In at least one embodiment, the width of the first welding section and the width of the second welding section are in the range of 0.05mm to 0.1mm.

[0012] In the above embodiment, by setting the width of the first welding section and the second welding section, the first welding section and the second welding section have sufficient width to disperse the force in the process of the middle plate welding layer being subjected to the force, thereby increasing the connection strength between the middle plate welding layer and the middle frame welding layer, so that the middle plate welding layer and the middle frame welding layer are not easy to fail in welding.

[0013] In at least one embodiment, the number of the first welding sections is greater than or equal to three, and the number of the second welding sections is greater than or equal to two, and the two ends of each second welding section are connected with two first welding sections respectively; wherein, the adjacent two second welding sections along the width direction of the rectangle are located on both sides of the length direction of the first welding section.

[0014] In the above embodiment, the adjacent two second welding sections along the width direction of the rectangular structure are located on both sides of the length direction of the first welding section, that is, the plurality of second welding sections are staggered along the length direction of the rectangular structure, so that the two ends of the length direction of the first welding section are shared by the second welding sections, and each position of the length direction of the second welding section can share the force, so as to improve the problem that the middle plate welding layer and the middle frame welding layer are easy to fail in welding.

[0015] In at least one embodiment, the thickness of the middle plate welding layer is in the range of 0.2mm to 0.5mm.

[0016] In the above embodiment, the thickness of the middle plate welding layer is set to 0.2mm to 0.5mm to improve the insufficient structural strength of the middle plate welding layer and the problem of material waste.

[0017] In at least one embodiment, the middle plate welding layer and the middle frame welding layer are stacked to form a rectangular structure, and a plurality of laser welding fusion layers are arranged on the rectangular structure. The plurality of laser welding fusion layers are arranged at intervals along the length direction of the rectangular structure, and the two outermost first welding sections of the plurality of laser welding fusion layers are arranged in alignment along the width direction of the rectangular structure.

[0018] In the above embodiment, the plurality of laser welding fusion layers are used to connect a rectangular structure, which further improves the connection strength between the middle plate welding layer and the middle frame welding layer. In addition, since the two outermost first welding sections of the plurality of laser welding fusion layers are arranged in alignment along the width direction of the rectangular structure, when the middle plate welding layer is subjected to a pushing force, the first welding sections of the plurality of laser welding fusion layers share the stress at the same width position of the rectangular structure, so that the stress is evenly distributed.

[0019] According to a second aspect of the present application, a mobile phone middle frame assembly is provided, which comprises a middle frame, a middle plate arranged in the middle frame, at least one middle plate connecting portion outwardly protruding around the periphery of the middle plate, the middle plate being connected to the middle frame through the middle plate connecting portion, and the laser welding structure described above, wherein the middle plate welding layer is located on the middle plate connecting portion, and the middle frame welding layer is located on the connection area between the middle frame and the middle plate connecting portion.

[0020] In the above embodiment, the laser welding structure is used in the mobile phone middle frame assembly. The laser welding fusion layer of the laser welding structure comprises at least two first welding sections and at least one second welding section. Since the length direction of the first welding section of the laser welding structure is arranged in parallel with the length direction of the rectangular structure, the main stress of the middle plate is concentrated on the first welding section during the pushing process. The stress of the first welding section is distributed to each position in the length direction of the first welding section, rather than being concentrated on the end of the first welding section. In this way, the connection strength between the middle plate and the middle frame is increased, so that the middle plate and the middle frame are not easily welded to fail. In addition, due to the change in the length direction of the first welding section, the position of the corner formed by the connection of the first welding section and the second welding section is changed, so that the corner does not first bear the pushing force, thereby further improving the connection strength between the middle plate and the middle frame.

[0021] In at least one embodiment, the middle plate connecting portion comprises a plurality of middle plate connecting ears arranged at intervals around the periphery of the middle plate, and each middle plate connecting ear is connected to the middle frame welding layer. The middle frame welding layer is provided with at least one middle frame connecting groove, and one middle plate connecting ear is arranged in each middle frame connecting groove.

[0022] In the above embodiment, by setting at least one middle frame connecting groove and setting one middle plate connecting lug in the middle frame connecting groove, due to the recess of the middle frame connecting groove, the middle plate connecting lug not connected with the middle frame connecting groove has the force pressed on the middle frame welding layer, so that the connection between the middle plate and the middle frame is more compact.

[0023] In at least one embodiment, the mobile phone middle frame assembly comprises at least two laser welding structures; wherein each laser welding structure is aligned and distributed along the length direction of the middle frame.

[0024] In the above embodiment, by setting a plurality of laser welding structures, the welding strength between the middle plate and the middle frame is further increased.

[0025] According to the third aspect of the present application, a mobile phone is provided, comprising the above mobile phone middle frame assembly.

[0026] In the above embodiment, the above mobile phone middle frame assembly is used in the mobile phone, and due to the improvement of the connection strength between the middle plate and the middle frame of the mobile phone middle frame assembly, the carrying capacity of the mobile phone middle frame assembly to carry other components is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of an embodiment of the mobile phone middle frame assembly of the present application.

[0028] Figure 2 is Figure 1 is an enlarged schematic diagram of the A area of the mobile phone middle frame assembly of

[0029] Figure 3 is Figure 1 is an enlarged schematic diagram of the B area of the mobile phone middle frame assembly of

[0030] Figure 4 is a structural schematic diagram of the laser welding fusion layer of the middle frame welding layer and the middle plate welding layer of the prior art.

[0031] MAIN ELEMENT SYMBOL EXPLANATION

[0032] 100, laser welding structure; 10, middle plate welding layer; 20, middle frame welding layer; 30, laser welding fusion layer; 31, first welding section; 310, head welding section; 311, tail welding section; 3110, connecting end; 3111, free end; 32, second welding section; 1, middle plate; 11, middle plate connecting part; 12, middle plate main body; 110, middle plate connecting lug; 2, middle frame; 210, middle frame connecting groove. DETAILED DESCRIPTION

[0033] Clearly, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0034] In the related art, the mobile phone middle frame assembly includes a middle plate and a middle frame, the middle frame and the middle plate are laser welded to form a laser welding fusion layer, the laser welding fusion layer includes a plurality of first welding sections and a plurality of second welding sections, the length direction of each first welding section is parallel to the width direction of the corresponding middle plate, the length direction of each second welding section is parallel to the length direction of the middle plate, and both ends of each second welding section are connected with two adjacent first welding sections, so that the second welding section and the first welding section have a corner.

[0035] The mobile phone middle frame assembly welded by the above laser welding fusion layer, in the process of being subjected to a thrust force, the force receiving area of the end of the first welding section is small, and one end of the first welding section is located at the edge of the middle frame close to the middle plate, so that the end of the first welding section is concentratedly subjected to a force, and the corners at both ends of the first welding section are prone to cracks, so that the middle plate is prone to deformation in the process of being subjected to a thrust force, and tears the already welded laser welding fusion layer, and a smaller thrust force between the middle plate and the frame can easily lead to welding failure, and the welding strength between the middle plate and the frame is low.

[0036] The embodiment of the present application provides a laser welding structure, which includes a middle plate welding layer and a middle frame welding layer, the middle plate welding layer and the middle frame welding layer are stacked, a part of the middle plate welding layer and the middle frame welding layer stacked is in a rectangular structure, the middle plate welding layer and the middle frame welding layer are welded to form a laser welding fusion layer, the laser welding fusion layer includes at least two first welding sections and at least one second welding section, each first welding section is parallel to the length direction of the rectangular structure, two first welding sections are arranged at intervals along the width direction of the rectangular structure, and one second welding section is connected between the single-side end portions of two adjacent first welding sections; the length of the first welding section is greater than the length of the second welding section.

[0037] In the above arrangement, since the length direction of the first welding section is parallel to the length direction of the rectangular structure, in the process of being subjected to the thrust force, the stress of the middle plate welding layer is mainly concentrated on the first welding section, and the stress of the first welding section is dispersed to each position in the length direction of the first welding section, instead of being concentrated on the end of the first welding section, so that the connection strength between the middle plate welding layer and the middle frame welding layer is increased, and the middle plate welding layer and the middle frame welding layer are not prone to welding failure. Moreover, due to the change of the length direction of the first welding section, the position of the corner formed by the connection of the first welding section and the second welding section is changed, so that the corner is not subjected to the thrust force first, thereby further improving the connection strength between the middle plate welding layer and the middle frame welding layer.

[0038] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features of the following embodiments and examples can be combined with each other without conflict.

[0039] Please refer to Figure 1 and Figure 2 , an embodiment of the present application provides a laser welding structure 100 of a mobile phone middle frame assembly, which comprises a middle plate welding layer 10, a middle frame welding layer 20 and a laser welding fusion layer 30, the middle frame welding layer 20 is stacked with the middle plate welding layer 10, and the stacked part of the middle plate welding layer 10 and the middle frame welding layer 20 is in a rectangular structure; the laser welding fusion layer 30 connects the middle plate welding layer 10 and the middle frame welding layer 20.

[0040] Please refer to Figure 2 and Figure 3 , the laser welding fusion layer 30 comprises at least two first welding sections 31 and at least one second welding section 32; each first welding section 31 is arranged parallel to the length direction of the rectangular structure, and the at least two first welding sections 31 are distributed along the width direction of the rectangular structure; one second welding section 32 is connected between the single-side end of the adjacent two first welding sections 31; the length of the first welding section 31 is greater than the length of the second welding section 32. In the above arrangement, since the length direction of the first welding section 31 is parallel to the length direction of the rectangular structure, in the process of being subjected to the thrust force, the stress of the middle plate welding layer 10 is mainly concentrated on the first welding section 31, and the stress of the first welding section 31 is dispersed to each position in the length direction of the first welding section 31, instead of being concentrated on the end of the first welding section 31, so that the connection strength between the middle plate welding layer 10 and the middle frame welding layer 20 is increased, and the middle plate welding layer 10 and the middle frame welding layer 20 are not prone to welding failure. Moreover, due to the change of the length direction of the first welding section 31, the position of the corner formed by the connection of the first welding section 31 and the second welding section 32 is changed, so that the corner is not subjected to the thrust force first, thereby making the corner not prone to fracture, and further improving the connection strength between the middle plate welding layer 10 and the middle frame welding layer 20.

[0041] Specifically, the laser welding fusion layer 30 is formed by laser welding fusion mixing of the middle plate welding layer 10 and the middle frame welding layer 20. The first welding section 31 and the second welding section 32 of the laser welding fusion layer 30 both penetrate the middle plate welding layer 10 and extend into the middle frame welding layer 20.

[0042] In some embodiments, the depth of the first welding section 31 and the second welding section 32 extending into the middle frame welding layer 20 is in the range of 0.1mm to 0.3mm. By setting the fusion depth of the laser welding fusion layer 30 at the middle frame welding layer 20, the laser welding fusion layer 30 will not penetrate the middle frame welding layer 20, thereby improving the problem of poor connection strength between the middle frame welding layer 20 and the middle plate welding layer 10 caused by simultaneously penetrating the middle frame welding layer 20 and the middle plate welding layer 10.

[0043] In some embodiments, the length of the first welding section 31 is in the range of 2mm to 4mm, and the length of the second welding section 32 is in the range of 0.3mm to 0.9mm. By setting the length of the first welding section 31 and the second welding section 32 in the above range, the first welding section 31 and the second welding section 32 have sufficient length to disperse the stress during the process of the middle plate welding layer 10 being subjected to the force, thereby increasing the connection strength between the middle plate welding layer 10 and the middle frame welding layer 20, and preventing the middle plate welding layer 10 and the middle frame welding layer 20 from being easily welded to failure.

[0044] In some embodiments, the width of the first welding section 31 and the width of the second welding section 32 are both in the range of 0.05mm to 0.1mm. By setting the width of the first welding section 31 and the second welding section 32 in the above range, the first welding section 31 and the second welding section 32 have sufficient width to disperse the stress during the process of the middle plate welding layer 10 being subjected to the force, thereby increasing the connection strength between the middle plate welding layer 10 and the middle frame welding layer 20, and preventing the middle plate welding layer 10 and the middle frame welding layer 20 from being easily welded to failure.

[0045] Please refer to Figure 2 In some embodiments, the number of the first welding sections 31 is greater than or equal to three, and the number of the second welding sections 32 is greater than or equal to two. Each second welding section 32 is connected to two first welding sections 31 at both ends thereof. Adjacent two second welding sections 32 along the width direction of the rectangular structure are located at both sides of the length direction of the first welding section 31.

[0046] If the first welding section 31 is provided with the second welding section 32 only at one side end, the end of the first welding section 31 not provided with the second welding section 32 only connects the middle plate welding layer 10 and the middle frame welding layer 20 by the end of the first welding section 31, so that the end of the first welding section 31 not provided with the second welding section 32 is prone to welding failure. Through the above arrangement, the two second welding sections 32 adjacent to each other along the width direction of the rectangular structure are respectively located at the two sides of the length direction of the first welding section 31, that is, the plurality of second welding sections 32 are staggered along the length direction of the rectangular structure. Thus, the two ends of the first welding section 31 in the length direction are both shared by the second welding sections 32, and each position in the length direction of the second welding section 32 can share the stress, so as to improve the problem that the middle plate welding layer 10 and the middle frame welding layer 20 are prone to welding failure.

[0047] In some embodiments, the material of the middle plate welding layer 10 and the middle frame welding layer 20 is aluminum alloy. Specifically, the material of the middle plate welding layer 10 and the middle frame welding layer 20 is AL6013.

[0048] In some embodiments, the thickness of the middle plate welding layer 10 is in the range of 0.2mm to 0.5mm. For the mobile phone middle frame assembly, if the thickness of the middle plate welding layer 10 is less than 0.2mm, the structural strength of the middle plate welding layer 10 will be insufficient, and if the thickness of the middle plate welding layer 10 is greater than 0.5mm, the material will be wasted.

[0049] Referring to Figure 2 and Figure 3 In some embodiments, the middle plate welding layer 10 and the middle frame welding layer 20 are stacked to form a rectangular structure, and the laser welding fusion layer 30 on the rectangular structure is provided with a plurality of laser welding fusion layers 30. The plurality of laser welding fusion layers 30 are arranged at intervals along the length direction of the rectangular structure, and the two first welding sections 31 located at the outermost sides of the plurality of laser welding fusion layers 30 are arranged in alignment along the width direction of the rectangular structure.

[0050] In the above arrangement, the plurality of laser welding fusion layers 30 jointly connect a rectangular structure, further improving the connection strength between the middle plate welding layer 10 and the middle frame welding layer 20. In addition, since the two first welding sections 31 located at the outermost sides of the plurality of laser welding fusion layers 30 are arranged in alignment along the width direction of the rectangular structure, when the middle plate welding layer 10 is subjected to a pushing force, the first welding sections 31 of the plurality of laser welding fusion layers 30 jointly share the stress at the same width position of the rectangular structure, so that the stress is uniformly distributed.

[0051] In the above arrangement, the laser welding fusion layer 30 on one rectangular structure is provided with at least two.

[0052] Referring to Figure 1In some embodiments, the middle plate welding layer 10 and the middle frame welding layer 20 are stacked to form a plurality of rectangular structures.

[0053] Referring to Figure 1 Embodiments of the present application also provide a middle frame assembly of a mobile phone, comprising: a middle frame 2 and a middle plate 1, the middle plate 1 being arranged in the middle frame 2; the middle plate 1 being provided with at least one middle plate connecting part 11 outwardly around the periphery of the middle plate 1; the middle plate 1 being connected to the middle frame 2 through the middle plate connecting part 11; and the middle frame assembly of the mobile phone further comprising a laser welding structure 100; wherein the middle plate welding layer 10 is located on the middle plate connecting part 11; and the middle frame welding layer 20 is located on the connection area of the middle frame 2 and the middle plate connecting part 11.

[0054] In the above embodiments, the laser welding structure 100 is used in the middle frame assembly of the mobile phone, and the laser welding fusion layer 30 of the laser welding structure 100 comprises at least two first welding sections 31 and at least one second welding section 32. Since the length direction of the first welding section 31 of the laser welding structure 100 is arranged in parallel with the length direction of the rectangular structure, the force is mainly concentrated on the first welding section 31 during the process of the middle plate 1 being subjected to the force, and the force of the first welding section 31 is dispersed to each position in the length direction of the first welding section 31, instead of being concentrated on the end of the first welding section 31. In this way, the connection strength between the middle plate 1 and the middle frame 2 is increased, so that the connection between the middle plate 1 and the middle frame 2 is not easy to fail. Moreover, since the length direction of the first welding section 31 is changed, the position of the corner formed by the connection of the first welding section 31 and the second welding section 32 is changed, so that the corner will not first bear the force, thereby further improving the connection strength between the middle plate 1 and the middle frame 2.

[0055] In one embodiment, the middle plate 1 comprises a middle plate main body 12, the middle plate welding layer 10 comprises a middle plate connecting lug 110, the middle plate connecting lug 110 being connected to the middle plate main body 12 and being arranged outwardly around the periphery of the middle plate main body 12; the middle frame welding layer 20 comprises a middle frame connecting groove 210, and at least part of the middle plate connecting lug 110 is arranged in the middle frame connecting groove 210.

[0056] Referring to Figure 4In the related art, a mobile phone middle frame assembly includes a middle plate and a middle frame, the middle frame and the middle plate are connected by laser welding to form a laser welding fusion layer 30, the middle plate has a middle plate welding layer 10 and a middle plate body 12, the middle frame has a middle frame welding layer 20, the middle plate welding layer 10 and the middle frame welding layer 20 are connected by laser welding to form the laser welding fusion layer 30, the laser welding fusion layer 30 includes a plurality of first welding sections 31, at least one of the plurality of first welding sections 31 has a free end 3111 and a connected end 3110, the free end 3111 of the first welding section 31 is located at one end of the first welding section 31 close to the edge of the middle plate welding layer 10, and the welding track of the above-mentioned laser welding fusion layer 30 is that the welding starts from the free end 3111 of the first welding section 31, and the laser head is bent in sequence to form a plurality of first welding sections 31 and a plurality of second welding sections 32 to form a vertical arch-shaped laser welding structure. In the above arrangement, when the middle plate is subjected to a pushing force, since the free end 3111 of the first welding section 31 is located at one end of the first welding section 31 away from the edge of the middle plate welding layer 10, and the starting energy of welding is low, the molten pool is shallow, and the pushing force applied to the middle plate is applied to the middle plate body 12, so that the free end 3111 of the first welding section 31 is prone to welding failure, resulting in low welding strength between the middle plate welding layer 10 and the middle frame welding layer 20.

[0057] Please refer to Figure 2 In an embodiment of the present application, the plurality of first welding sections 31 includes a head welding section 310 and a tail welding section 311, the head welding section 310 and the tail welding section 311 each have a free end 3111 and a connected end 3110, the first welding section close to the edge of the middle plate on one side is the head welding section 310, and the free end 3111 of the head welding section 310 is the starting point of welding. In the above arrangement, by arranging the entire head welding section 310 close to the edge of the middle plate on one side, when a pushing force is applied to the middle plate body 12, the head welding section 310 will not be subjected to force first, so that the middle plate welding layer 10 and the middle frame welding layer 20 are not prone to welding failure, and during the process that the middle plate welding layer 10 is subjected to a pushing force, each position in the length direction of the head welding section 310 can share the force received, rather than concentrating on the starting point of welding to bear the force, thereby improving the connection strength between the middle plate welding layer and the middle frame welding layer.

[0058] In some embodiments, the middle plate connecting portion 11 comprises a plurality of middle plate connecting lugs 110, the plurality of middle plate connecting lugs 110 are arranged at intervals around the circumference of the middle plate 1, and each middle plate connecting lug 110 is connected with the middle frame welding layer 20; the middle frame welding layer 20 is provided with at least one middle frame connecting groove 210, and one middle plate connecting lug 110 is arranged in one middle frame connecting groove 210. In the above arrangement, by arranging at least one middle frame connecting groove 210 and arranging one middle plate connecting lug 110 in the middle frame connecting groove 210, due to the recess of the middle frame connecting groove 210, the other middle plate connecting lugs 110 not connected with the middle frame connecting groove 210 have a force pressing on the middle frame welding layer 20, so that the connection between the middle plate 1 and the middle frame 2 is more compact.

[0059] In one embodiment, the middle plate connecting lug 110 and the middle frame connecting groove 210 are arranged in plurality, the plurality of middle plate connecting lugs 110 are arranged at intervals around the circumference of the middle plate main body 12, and the plurality of middle plate connecting lugs 110 and the plurality of middle frame connecting grooves 210 are arranged in one-to-one correspondence, and the laser welding fusion layer 30 is arranged between each middle plate connecting lug 110 and the corresponding middle frame connecting groove 210. In the above arrangement, the plurality of middle plate connecting lugs 110 and the plurality of middle frame connecting grooves 210 are arranged in one-to-one correspondence, so that after the middle plate connecting lug 110 and the middle frame connecting groove 210 are overlapped, the thickness between the middle plate 1 and the middle frame 2 is kept within a certain range, so that the structure in the thickness direction of the middle plate 1 and the middle frame 2 is more compact.

[0060] Specifically, by arranging a plurality of middle plate connecting lugs 110, the plurality of middle plate connecting lugs 110 are overlapped with the middle frame welding layer 20 to form a plurality of rectangular structures.

[0061] In one embodiment, the middle frame 2 is a rectangular structure, and the first welding section 31 of the laser welding fusion layer 30 of each laser welding structure 100 is parallel to the length direction of the middle frame 2.

[0062] The embodiments of the present application also provide a mobile phone, which comprises the mobile phone middle frame assembly. The mobile phone middle frame assembly is used in the mobile phone, and due to the improvement of the connection strength between the middle plate 1 and the middle frame 2 of the mobile phone middle frame assembly, the carrying capacity of the mobile phone middle frame assembly for other components is improved.

[0063] In addition, for those skilled in the art, other various corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications shall belong to the protection scope of the claims of the present application.

Claims

1. A laser welding structure of a mobile phone middle frame assembly, characterized in that, The laser welding structure comprises: a middle plate welding layer; a middle frame welding layer arranged below the middle plate welding layer; a laser welding fusion layer arranged between the middle plate welding layer and the middle frame welding layer; the laser welding fusion layer is in a rectangular overall profile and comprises at least two first welding segments and at least one second welding segment; the first welding segments and the second welding segment each penetrate the middle plate welding layer upward and each penetrates into the middle frame welding layer downward; each of the first welding segments is arranged in parallel to the length direction of the rectangle; one of the second welding segments is connected between the single-side end portions of two adjacent first welding segments; the length of the first welding segment is greater than the length of the second welding segment.

2. The laser welded structure of claim 1, wherein, The depth of penetration of the first welding segments and the second welding segment into the middle frame welding layer is in the range of 0.1 mm to 0.3 mm.

3. The laser welded structure of claim 1, wherein, The length of the first welding segment is in the range of 2 mm to 4 mm; the length of the second welding segment is in the range of 0.3 mm to 0.9 mm.

4. The laser welded structure of claim 1, wherein, The width of the first welding segment and the width of the second welding segment are in the range of 0.05 mm to 0.1 mm.

5. The laser welded structure of claim 1, wherein, The number of the first welding segments is greater than or equal to three, and the number of the second welding segments is greater than or equal to two; the two ends of each second welding segment are connected to two first welding segments respectively; wherein, the two adjacent second welding segments along the width direction of the rectangle are located on the two sides of the length direction of the first welding segment.

6. The laser welded structure of claim 1, wherein, The thickness of the middle plate welding layer is in the range of 0.2 mm to 0.5 mm.

7. A mobile phone middle frame assembly, characterized in that, The laser welding structure comprises: a middle frame; a middle plate arranged in the middle frame; the middle plate is provided with at least one middle plate connecting portion outward around the middle plate; the middle plate is connected to the middle frame through the middle plate connecting portion; and the laser welding structure according to any one of claims 1 to 6; wherein, the middle plate welding layer is arranged on the middle plate connecting portion; and the middle frame welding layer is arranged on the connecting area of the middle frame and the middle plate connecting portion. 8.The mobile phone middle frame assembly of claim 7, wherein, The mobile phone middle frame assembly comprises at least two laser welding structures; wherein, each laser welding structure is arranged in alignment along the length direction of the middle frame. 9.The mobile phone middle frame assembly of claim 7, wherein, The middle plate connecting portion comprises a plurality of middle plate connecting ears arranged in intervals around the circumference of the middle plate; each middle plate connecting ear is connected to the middle frame welding layer; the middle frame welding layer is provided with at least one middle frame connecting groove; one middle plate connecting ear is arranged in one middle frame connecting groove.

10. A handset, comprising: The mobile phone comprises the mobile phone middle frame assembly according to any one of claims 7 to 9.

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