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CN-122028347-A - Rear cover, rear shell, rear cover assembly and electronic equipment

CN122028347ACN 122028347 ACN122028347 ACN 122028347ACN-122028347-A

Abstract

The embodiment of the application provides a rear cover, a rear shell, a rear cover assembly and electronic equipment, and belongs to the technical field of rear covers. The rear cover includes a first metal layer and a second metal layer. The second metal layer is positioned on the inner side of the first metal layer along the thickness direction of the rear cover, and the second metal layer is provided with a porous structure. Thus, the problem that the metal rear cover is hot in hand feeling is solved while the rear cover with metal texture is realized.

Inventors

  • HUANG LIZHONG
  • MAO JIAN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20250306

Claims (20)

  1. 1. A rear cover (10), characterized by comprising: a first metal layer (11); And a second metal layer (12), wherein the second metal layer (12) is positioned on the inner side of the first metal layer (11) along the thickness direction of the rear cover (10), and the second metal layer (12) has a porous structure.
  2. 2. The back cover (10) according to claim 1, characterized in that the thermal conductivity of the second metal layer (12) is less than or equal to 50W/(m-K), and/or the thermal diffusivity of the second metal layer (12) is less than or equal to 5 x 10 -5 m 2 /s.
  3. 3. The back cover (10) according to claim 1 or 2, characterized in that the porous structure comprises a plurality of sub-holes (14), each sub-hole (14) being a blind hole and being located inside the second metal layer (12), the inside of the second metal layer (12) being a side of the second metal layer (12) remote from the first metal layer (11) in the thickness direction of the back cover (10).
  4. 4. A rear cover (10) according to claim 3, characterized in that the second metal layer (12) comprises: -a central zone (121), said sub-apertures (14) being located inside said central zone (121); An edge region (122) surrounding the central region (121).
  5. 5. The back cover (10) according to claim 4, wherein the width of the edge region (122) is greater than or equal to 0.5mm in a direction perpendicular to the thickness direction of the back cover (10).
  6. 6. The back cover (10) according to claim 5, characterized in that the width of the edge zone (122) is less than or equal to 3mm.
  7. 7. Rear cover (10) according to claim 1 or 2, characterized in that the material of the second metal layer (12) is a porous metal material.
  8. 8. The back cover (10) of claim 7, wherein the porous metal material is a foamed metal material or a metal fiber mat.
  9. 9. Rear cover (10) according to any of claims 1 to 8, characterized in that the second metal layer (12) is integrally formed.
  10. 10. Rear cover (10) according to any one of claims 1 to 6, characterized in that the second metal layer (12) comprises at least two metal parts spliced to each other, the orthographic projections of adjacent two of said metal parts onto the first metal layer (11) being at least partially misaligned in a direction perpendicular to the thickness direction of the rear cover (10).
  11. 11. The back cover (10) according to claim 10, wherein adjacent two of the metal portions are welded in a direction perpendicular to a thickness direction of the back cover (10).
  12. 12. The back cover (10) according to claim 10 or 11, characterized in that the at least two metal parts comprise a first metal part (123) and a second metal part (124), the porous structure being provided to the first metal part (123), the second metal part (124) being a solid metal part.
  13. 13. The back cover (10) of claim 12, wherein the first metal portion (123) and the second metal portion (124) are of different materials.
  14. 14. Back cover (10) according to any of claims 1 to 13, characterized in that the first metal layer (11) is directly connected with the second metal layer (12).
  15. 15. The back cover (10) according to claim 14, characterized in that the first metal layer (11) is welded with the second metal layer (12) or that the first metal layer (11) is diffusion bonded with the second metal layer (12).
  16. 16. The back cover (10) according to any one of claims 1 to 13, characterized in that the back cover (10) further comprises a third metal layer (13), the third metal layer (13) being located between the first metal layer (11) and the second metal layer (12), the first metal layer (11) being fixedly connected with the second metal layer (12) by means of the third metal layer (13).
  17. 17. Rear cover (10) according to claim 16, characterized in that the third metal layer (13) is welded with the first metal layer (11) or that the third metal layer (13) is diffusion bonded with the first metal layer (11).
  18. 18. Rear cover (10) according to claim 16 or 17, characterized in that the third metal layer (13) is welded with the second metal layer (12) or that the third metal layer (13) is diffusion bonded with the second metal layer (12).
  19. 19. The back cover (10) according to any one of claims 1 to 18, wherein the first metal layer (11) is of a single-layer structure, or wherein the first metal layer (11) comprises a plurality of sub-metal layers (111) arranged side by side in a thickness direction of the back cover (10).
  20. 20. Rear cover (10) according to any of claims 1 to 19, characterized in that the material of the first metal layer (11) is an aluminium alloy material, a titanium metal material or a stainless steel material.

Description

Rear cover, rear shell, rear cover assembly and electronic equipment Technical Field The application relates to the technical field of rear covers, in particular to a rear cover, a rear shell, a rear cover assembly and electronic equipment. Background At present, electronic devices such as mobile phones and tablet personal computers comprise a display screen, a middle frame and a rear cover, wherein the rear cover and the display screen are respectively positioned on two opposite sides of the middle frame, the rear cover, the display screen and the middle frame enclose a containing space, and the containing space is used for containing functional elements of the electronic devices, such as elements of a battery, a camera module and the like. In the related art, the metal rear cover is made of an aluminum alloy material, so that a metal appearance effect can be achieved. However, aluminum alloy material's coefficient of heat conductivity is high, and heat conduction is fast, and when electronic equipment used, the temperature that leads to the metal back lid is high, leads to the fact the feel to scald the somatosensory, has influenced user's experience. Disclosure of Invention The embodiment of the application provides a rear cover, a rear shell, a rear cover assembly and electronic equipment, which can realize the rear cover with metal texture and solve the problem of hand feel scalding. In a first aspect, an embodiment of the present application provides a back cover that includes a first metal layer and a second metal layer. The second metal layer is positioned on the inner side of the first metal layer along the thickness direction of the rear cover, and the second metal layer is provided with a porous structure. In the embodiment of the application, the first metal layer is positioned on the outer side of the second metal layer to provide metal texture, so that the outer surface of the rear cover has the metal texture appearance effect, and the outer surface of the rear cover is the appearance surface of the rear cover, so that the appearance surface of the rear cover has the metal texture appearance effect. The second metal layer has a porous structure, so that the heat transfer area is reduced, the heat transfer channel is narrow, heat storage is reduced while heat transfer is reduced, and therefore the heat transferred to the first metal layer through the second metal layer is less, the temperature of the first metal layer is low, the problem of hand feeling scalding is avoided, and the user experience is improved. In addition, through setting up porous structure, can also reduce the weight of second metal level, can control the whole weight of back lid in lower within range, help the back lid to realize lightweight design. In addition, through setting up porous structure, can make the bulk strength of second metal level high, provide the supporting strength, ensure that the bulk strength of back lid satisfies the requirement, can not fracture and can not warp when falling. In some possible implementations, the thermal conductivity of the second metal layer is less than or equal to 50W/(m·k), and/or the thermal diffusivity of the second metal layer is less than or equal to 5×10 -5m2/s. In this implementation manner, the thermal conductivity and/or thermal diffusivity of the second metal layer are limited, which means that the second metal layer is made of a low-thermal-conductivity metal material, so that the second metal layer has a low thermal conductivity, thereby further reducing the heat transferred to the first metal layer through the second metal layer, further reducing the heat on the first metal layer, and realizing a better temperature control effect. In some possible implementations, the porous structure includes a plurality of sub-holes, each of which is a blind hole and is located inside the second metal layer, which is a side of the second metal layer away from the first metal layer in a thickness direction of the rear cover. In this implementation manner, when each sub-hole is a blind hole, the contact area between the second metal layer and the third metal layer or the first metal layer can be increased, which is helpful to increase the connection strength between the second metal layer and the first metal layer or the third metal layer. In addition, the preparation procedure of the rear cover can be optimized, the process steps are reduced, and the preparation efficiency of the rear cover is improved. Finally, the first metal layer and the second metal layer can be connected together, then the second metal layer is etched, the second metal layer is not etched and penetrated when the sub-holes are formed, and the first metal layer is protected from being influenced. In some possible implementations, the second metal layer includes a central region and an edge region. Wherein the sub-holes are located inside the central region. The edge region surrounds the central region. In this imp