High-quality composite heat dissipation plate and manufacturing process thereof

Abstract

The invention discloses a high-quality composite heat dissipation plate and a manufacturing process thereof. The high-quality composite heat dissipation plate comprises a first metal sheet and a second metal sheet, the inner side face of the first metal sheet is partially separated from the inner side face of the second metal sheet to form a cooling liquid pipeline, and the first welding face penetrates through the outer side face of the first metal sheet and / or the second welding face penetrates through the outer side face of the second metal sheet to form micropores used for exhausting. Through the arrangement of the micropores, exhaust can be carried out in the brazing process through the micropores, gas accumulation between the two welding faces is avoided, and therefore the defect that bumps and bubbles appear on the outer surface of the formed heat dissipation plate is eradicated, the product appearance is better, the heat conduction performance of the product can be improved, and meanwhile after brazing is completed, the heat dissipation plate is not prone to deformation. The micro holes can be completely filled with the brazing filler metal layer, the micro holes cannot appear, any adverse effect on the appearance of the product cannot be caused, and therefore the quality of the product is effectively improved, and the use requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat dissipation plates, in particular to a high-quality composite heat dissipation plate and a manufacturing process thereof. BACKGROUND

[0002] A heat dissipation plate (Heat Sink Plate or Cooling Plate) is a passive heat dissipation device used for efficient heat transfer and dissipation. Its main function is to quickly transfer the excess heat generated during device operation to prevent performance degradation or damage due to high temperature. It is widely used in electronic devices, industrial equipment, LED lighting, automotive electronics, and other fields. The core of the heat dissipation plate is to use heat conduction to transfer heat from the heat source (such as a chip or LED lamp bead) to itself, and then spread the heat to the surrounding environment through convection (air flow) or radiation. Some designs combine other heat dissipation methods (such as adding a fan to enhance convection or embedding a heat pipe to improve heat conduction efficiency).

[0003] To improve heat dissipation efficiency, current heat dissipation plates are all composite structures, which are usually combined by two metal sheets. After the two metal sheets are combined, the cooling liquid channel formed between them is filled with refrigerant to improve heat dissipation efficiency. In the prior art, the two metal sheets are fixed together by brazing with a brazing layer. However, the welding area between the two metal sheets is generally large, and the material of the brazing layer is different from that of the metal sheet. During brazing, gas is easily accumulated between the two welding surfaces, and the gas is difficult to completely discharge, resulting in the formation of bulges and bubbles on the outer surface of the formed heat dissipation plate, which seriously affects the appearance and the heat conduction performance of the product, and cannot meet the high-quality requirements. Therefore, it is necessary to study a scheme to solve the above problems. SUMMARY

[0004] Therefore, the present application aims to provide a high-quality composite heat dissipation plate and a manufacturing process thereof, which can effectively solve the problem of poor product quality caused by bulges and bubbles on the heat dissipation plate after manufacturing.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] The application discloses a high-quality composite heat dissipation plate, which comprises a first metal sheet and a second metal sheet; the inner side surface of the first metal sheet is partially separated from the inner side surface of the second metal sheet to form a cooling liquid pipeline; the rest of the inner side surface of the first metal sheet is a first welding surface; the rest of the inner side surface of the second metal sheet is a second welding surface; the first welding surface and the second welding surface are fixed together through a brazing filler layer; the first welding surface and the outer side surface of the first metal sheet are perforated and / or the second welding surface and the outer side surface of the second metal sheet are perforated to form micro-holes for exhausting; and the brazing filler layer completely fills the micro-holes after brazing.

[0007] As a preferred solution, the micro-holes are multiple and uniformly arranged on the first welding surface and / or the second welding surface.

[0008] As a preferred solution, the micro-holes are formed through laser drilling.

[0009] As a preferred solution, the inner diameter of the micro-holes is 0.1-0.3 mm.

[0010] As a preferred solution, the first metal sheet and the second metal sheet are both made of aluminum.

[0011] As a preferred solution, the cooling liquid pipeline is in a mesh shape.

[0012] As a preferred solution, the brazing filler layer is coated on the first welding surface and / or the second welding surface before brazing, and the micro-holes perforate the upper and lower surfaces of the brazing filler layer.

[0013] The application further discloses a manufacturing process of the high-quality composite heat dissipation plate, which comprises the following steps.

[0014] (1) stamping and preforming the first metal sheet and the second metal sheet;

[0015] (2) coating a brazing filler on the inner side surface of the first metal sheet and / or the inner side surface of the second metal sheet to form a brazing filler layer;

[0016] (3) drilling micro-holes on the corresponding positions of the first metal sheet and / or the second metal sheet, and the micro-holes perforate the upper and lower surfaces of the brazing filler layer;

[0017] (4) stacking the first metal sheet and the second metal sheet together and arranging the brazing filler layer between the first metal sheet and the second metal sheet;

[0018] (5) heating the first metal sheet and / or the second metal sheet to melt the brazing filler for brazing; in the process of brazing, the gas between the first welding surface and the second welding surface is exhausted from the micro-holes, and the brazing filler is extruded and filled into the micro-holes in a molten state; and the brazing filler layer solidifies to completely fill the micro-holes after brazing.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0020] By incorporating micropores, air can be released during the brazing process, preventing air accumulation between the two welding surfaces. This eliminates defects such as bulges and bubbles on the outer surface of the formed heat sink, resulting in a better product appearance and improved thermal conductivity. Furthermore, after brazing, the brazing filler layer completely fills the micropores, making them invisible and thus not negatively impacting the product's appearance. This effectively improves product quality and meets usage requirements.

[0021] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first state of the manufacturing process of a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the second state of the manufacturing process of a preferred embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the third state of the manufacturing process of a preferred embodiment of the present invention;

[0025] Figure 4 This is a partial cross-sectional schematic diagram of a preferred embodiment of the present invention;

[0026] Figure 5 This is a partial cross-sectional schematic diagram of another structure according to a preferred embodiment of the present invention;

[0027] Figure 6 This is a partial cross-sectional schematic diagram of another structure of a preferred embodiment of the present invention.

[0028] Explanation of reference numerals in the attached diagram:

[0029] 10. First metal sheet; 11. First welding surface

[0030] 12. First recess 20. Second metal sheet

[0031] 21. Second welding surface; 22. Second recess.

[0032] 30. Brazing filler layer 101. Coolant piping

[0033] 102. Micropores. Detailed Implementation

[0034] Please refer to Figures 1 to 6As shown, it illustrates the specific structure of a high-quality composite heat sink according to a preferred embodiment of the present invention, including a first metal sheet 10 and a second metal sheet 20.

[0035] The inner surface of the first metal sheet 10 is partially separated from the inner surface of the second metal sheet 20 to form a coolant pipe 101. The remaining portion of the inner surface of the first metal sheet 10 forms a first welding surface 11, and the remaining portion of the inner surface of the second metal sheet 20 forms a second welding surface 21. The first welding surface 11 and the second welding surface 21 are brazed together by a brazing filler layer 30. The first welding surface 11 penetrates the outer surface of the first metal sheet 10, and / or the second welding surface 21 penetrates the outer surface of the second metal sheet 20 to form micropores 102 for venting. After brazing, the brazing filler layer 30 completely fills the micropores 102. Figure 4 As shown, the micropore 102 exists only on the first metal sheet 10, penetrating between the first welding surface 11 and the outer surface of the first metal sheet 10; as Figure 5 As shown, the micropore 102 exists only on the second metal sheet 20, penetrating between the second welding surface 21 and the outer surface of the second metal sheet 20; as Figure 6 As shown, both the first metal sheet 10 and the second metal sheet 20 are provided with micropores 102. The micropores 102 on the first metal sheet 10 penetrate between the first welding surface 11 and the outer surface of the first metal sheet 10, and the micropores 102 on the second metal sheet 20 penetrate between the second welding surface 21 and the outer surface of the second metal sheet 20. Furthermore, the micropores 102 on the first metal sheet 10 and the micropores 102 on the second metal sheet 20 are arranged separately and in a staggered manner to achieve a better air venting effect.

[0036] In this embodiment, both the first metal sheet 10 and the second metal sheet 20 are made of aluminum. The coolant pipe 101 is mesh-like. Both the first metal sheet 10 and the second metal sheet 20 are formed by stamping. The first metal sheet 10 has a concave-convex shape with a first recess 12 formed on its inner side. The second metal sheet 20 has a concave-convex shape with a second recess 22 formed on its inner side. The second recess 22 and the first recess 12 are vertically aligned and connected to form the aforementioned coolant pipe 101. There are multiple microholes 102, which are evenly spaced on the first welding surface 11 and / or the second welding surface 21. The microholes 102 are formed by laser drilling, but can also be formed by other methods, without limitation. The microholes 102 can be circular, with an inner diameter of 0.1-0.3 mm, preferably 0.2 mm. The shape and size of the microholes 102 are not limited, as long as they do not affect the appearance of the product. In addition, before brazing, the brazing filler layer 30 is coated on the first welding surface 11 and / or the second welding surface 21, and the micropore 102 penetrates the upper and lower surfaces of the brazing filler layer 30.

[0037] This invention also discloses a manufacturing process for the aforementioned high-quality composite heat sink, comprising the following steps:

[0038] (1) Stamping and prefabrication of the first metal sheet 10 and the second metal sheet 20.

[0039] (2) A brazing filler layer 30 is formed by coating the inner side of the first metal sheet 10 and / or the inner side of the second metal sheet 20 with brazing filler metal.

[0040] (3) Microholes 102 are formed at the positions corresponding to the first metal sheet 10 and / or the second metal sheet 20, and the microholes 102 penetrate the upper and lower surfaces of the solder layer 30.

[0041] (4) The first metal sheet 10 and the second metal sheet 20 are stacked together and the solder layer 30 is sandwiched between the first metal sheet 10 and the second metal sheet 20.

[0042] (5) The first metal sheet 10 and / or the second metal sheet 20 are heated to melt the brazing filler metal for brazing. During the brazing process, the gas between the first welding surface 11 and the second welding surface 21 is discharged from the micropore 102. At the same time, the brazing filler metal is squeezed and filled into the micropore 102 in the molten state. After the brazing is completed, the brazing filler metal layer 30 is solidified to completely fill the micropore 102 so that the micropore 102 is not visible on the product appearance.

[0043] The key design feature of this invention is that by incorporating micropores, air can be released during the brazing process, preventing gas accumulation between the two welding surfaces. This eliminates defects such as bulges and bubbles on the outer surface of the formed heat sink, resulting in a better product appearance and improved thermal conductivity. Furthermore, after brazing, the brazing filler layer completely fills the micropores, making them invisible and thus not negatively impacting the product's appearance. This effectively improves product quality and meets usage requirements.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-quality composite heat sink, comprising a first metal sheet and a second metal sheet; a portion of the inner surface of the first metal sheet is partially separated from the inner surface of the second metal sheet to form a coolant conduit; the remaining portion of the inner surface of the first metal sheet forms a first welding surface; the remaining portion of the inner surface of the second metal sheet forms a second welding surface; the first welding surface and the second welding surface are fixed together by brazing with a layer of solder; characterized in that: The first welding surface penetrates the outer surface of the first metal sheet and / or the second welding surface penetrates the outer surface of the second metal sheet to form micropores for venting. After brazing, the brazing filler layer completely fills the micropores.

2. The high-quality composite heat sink according to claim 1, characterized in that: The micropores are multiple, and the multiple micropores are evenly spaced and arranged on the first welding surface and / or the second welding surface.

3. The high-quality composite heat sink according to claim 1, characterized in that: The micropores are formed by laser drilling.

4. The high-quality composite heat sink according to claim 1, characterized in that: The inner diameter of the micropore is 0.1-0.3 mm.

5. The high-quality composite heat sink according to claim 1, characterized in that: Both the first metal sheet and the second metal sheet are made of aluminum.

6. The high-quality composite heat sink according to claim 1, characterized in that: The coolant piping is in the form of a mesh.

7. The high-quality composite heat sink according to claim 1, characterized in that: Before brazing, the brazing filler metal layer is coated on the first welding surface and / or the second welding surface, and the micropores penetrate the upper and lower surfaces of the brazing filler metal layer.

8. A manufacturing process for a high-quality composite heat sink as described in any one of claims 1-7, characterized in that: It includes the following steps: (1) Stamping and prefabrication of the first metal sheet and the second metal sheet; (2) A brazing filler layer is formed by coating brazing filler metal on the inner surface of the first metal sheet and / or the inner surface of the second metal sheet; (3) Microholes are formed at the corresponding positions of the first metal sheet and / or the second metal sheet, and the microholes penetrate the upper and lower surfaces of the solder layer; (4) The first metal sheet and the second metal sheet are stacked together and the solder layer is sandwiched between the first metal sheet and the second metal sheet; (5) Heating the first metal sheet and / or the second metal sheet to melt the brazing filler metal for brazing. During the brazing process, the gas between the first and second welding surfaces is discharged from the micropores. At the same time, the brazing filler metal is squeezed and filled into the micropores in the molten state. After the brazing is completed, the brazing filler metal layer solidifies and completely fills the micropores.

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