A laser welded heat sink

Abstract

This utility model relates to the field of heat dissipation technology, specifically to a laser-welded heat sink. The heat sink includes a heat sink base and a heat dissipation fin assembly that are sequentially attached from bottom to top. The heat dissipation fin assembly includes multiple fins stacked and interlocked side-by-side, with multiple rows of laser welding points spaced apart from one end to the other. The purpose of this utility model is to provide a laser-welded heat sink that, through the sequential attachment design of the base and the heat dissipation fin assembly, combined with multiple fins arranged side-by-side at intervals, is laser-welded into a single unit, effectively improving the overall structural strength and heat dissipation efficiency of the heat sink.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology, specifically to a laser-welded heat sink. Background Technology

[0002] Laser welding technology is widely used in electronic components, heat sinks, and other industrial fields due to its advantages such as high precision, high efficiency, and low heat-affected zone. Especially in the manufacture of heat sinks, laser welding can effectively and firmly connect the heat sink fins to the base and connecting plates, thereby improving heat dissipation performance and the overall stability of the product. However, some problems still exist in the practical application of existing technologies.

[0003] First, traditional heatsink soldering methods often employ reflow soldering with solder paste. These methods are prone to thermal deformation during soldering, leading to unstable heatsink geometry. The presence of fused solder paste between the base and fins further hinders heat dissipation. Second, existing traditional solder paste soldering techniques often lack rational design. Solder paste has a high thermal efficiency but is costly, requiring high-temperature melting and solidification. Prolonged use of heatsinks in high-temperature environments reduces their overall strength and durability. Furthermore, current technologies lack sufficient precision in controlling solder joints, easily causing defects such as weak or over-soldering, impacting product reliability.

[0004] Therefore, there is an urgent need for a new type of laser-welded heat sink design to solve the above problems and improve the welding quality and heat dissipation performance of the heat sink. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a laser-welded heat sink. Through the sequential bonding design of the base and the heat sink fin assembly, combined with multiple fins arranged side by side and spaced apart, the heat sink is laser-welded into one piece, which can effectively improve the overall structural strength and heat dissipation efficiency of the heat sink.

[0006] This utility model is achieved through the following technical solution:

[0007] A laser-welded heat sink is characterized in that it includes a heat sink base and a heat sink fin assembly that are sequentially attached from bottom to top; the heat sink fin assembly includes a plurality of fins that are stacked and fastened together in parallel with spacing, and the fins are provided with multiple rows of laser welding points at intervals from one end to the other.

[0008] Among them, multiple fins are stacked to form a fin group by using a die stamping on the fin, and a laser welding groove is provided on the upper surface.

[0009] The adjacent heat dissipation fin groups are provided with multiple welding transition grooves, and the bottom end of the transition groove is provided with a laser welding point.

[0010] The distance between adjacent transition grooves shall not be less than 1.0 mm.

[0011] The first laser welding point includes:

[0012] The basic welding area with a diameter of 0.8 mm or more, and the welding edge heat diffusion transition groove area with an area of ​​0.8 x 1.2 mm or more.

[0013] The heat dissipation fins have a 90° bend that fits into the base.

[0014] After the fin bend is attached to the base, a laser source is used to pass through the transition zone of the welding groove to weld multiple laser welding points in the basic welding area.

[0015] The beneficial effects of this utility model are:

[0016] This invention discloses a laser-welded heat sink. By incorporating a heat sink base and a heat sink fin assembly, the rational distribution of the first laser welding points within the heat sink fin assembly evenly disperses welding stress, avoiding localized stress concentration and thus improving the heat sink's durability and reliability. Furthermore, the heat sink, combined with laser welding technology, achieves high-precision welding, fusing the heat sink base and fin assembly into a single unit, reducing the heat-affected zone, maintaining the heat sink's geometric stability, and further enhancing heat dissipation performance. Through optimized welding point design and distribution, this invention effectively reduces the incidence of welding defects, ensures welding quality, and extends the heat sink's service life. Attached Figure Description

[0017] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of Example 1.

[0019] Figure 2 This is another structural schematic diagram of Example 1.

[0020] Figure 3 This is another structural schematic diagram of Example 1.

[0021] Figure Labels

[0022] Base--101, heat dissipation fin assembly--102, heat dissipation slot--103, fins--104, first laser welding point--105&107, transition groove--106, second laser welding point--107. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] Example 1

[0027] like Figures 1 to 3 As shown, this embodiment discloses a laser-welded heat sink, which includes a heat sink base 101 and a heat sink fin assembly 102 that are attached sequentially from bottom to top; the heat sink fin assembly 102 includes a plurality of fins 104 arranged side by side at intervals, and the fins 104 are provided with laser welding points 105 & 107 arranged sequentially at intervals from one end to the other.

[0028] This embodiment of a laser-welded heat sink, through the design of the base 101 and the heat dissipation fin group 102 being completely bonded in sequence, combined with multiple fins 104 arranged side by side at intervals, can effectively improve the overall structural strength and heat dissipation efficiency of the heat sink.

[0029] Specifically, a heat dissipation groove 103 is provided on the heat dissipation fin group 102 between adjacent first laser welding points 105 to 107, which can effectively improve the heat dissipation efficiency of the heat dissipation fin in this embodiment.

[0030] Specifically, multiple transition grooves 106 are provided between adjacent heat dissipation grooves 103, and laser welding points are provided at the bottom of the transition grooves 106. The transition grooves 103 can help the laser welding machine identify the welding point of the second laser welding point 107, achieving a rapid identification effect and welding sequentially; in addition, by distinguishing different welding points, the distance between laser welding points can be increased, avoiding local overheating and deformation. Preferably, the distance between adjacent transition grooves 103 is not less than 8mm.

[0031] Specifically, the first laser welding point 105 includes:

[0032] The basic welding area with a diameter of 0.8 mm or more, and the welding edge heat diffusion transition groove area with an area of ​​0.8 x 1.2 mm or more.

[0033] In this embodiment, the heat sink base and fin assembly are welded together with solder points 105 & 107 evenly distributed to ensure mechanical strength in the fusion structure area, and the heat diffusion area reduces the thermal stress concentration factor by 40%; the welding transition grooves 103 & 106 help with laser welding positioning, and can improve heat dissipation efficiency by 10% during use by allowing ventilation and convection.

[0034] Example 2

[0035] In this embodiment, the heat dissipation fins are provided with a 90° bend, and the bend fits into the base.

[0036] Specifically, the bending design of the heatsink fins extends the airflow path by 1.5-2 times, improving heat dissipation efficiency by 10%-20% through forced convection. Specific angle bending shifts the structural resonant frequency outside the operating frequency band, reducing noise levels by 10-15 dB(A); the bent surface directly adheres to the base, reducing the influence of intermediate media layers and lowering interface contact thermal resistance by 25%-35%. The heatsink's fit with the mounting surface reaches over 98%, improving heat dissipation performance by over 20%.

[0037] Example 3

[0038] In this embodiment, after the fin bend is attached to the base, a laser source is used to pass through the transition zone of the welding groove to weld multiple laser welding points in the basic welding area.

[0039] Specifically, the laser welding design integrates the fin assembly with the base through multiple welding points, enhancing structural strength and solving the performance loss problem of traditional solder paste-welded heat sinks at 100°C. This makes it suitable for any application scenario with stringent high-temperature heat dissipation requirements.

[0040] In summary, this invention provides a laser-welded heat sink. By employing a base 101 and a heat dissipation fin assembly 102, and using laser welding technology, the laser passes through transition grooves 103 and 106, welding the base 101 and the heat dissipation fin assembly 102 into a single unit. The rational distribution of welding points 105 and 107 on the heat dissipation fin assembly 102 evenly disperses welding stress, avoiding localized stress concentration, thereby improving the durability and reliability of the heat sink. Furthermore, the heat sink of this invention, combined with laser welding technology, enables high-precision welding, reduces the heat-affected zone, maintains the geometric stability of the heat sink, and further enhances heat dissipation performance. By optimizing the design and distribution of welding points, this invention effectively reduces the incidence of welding defects, ensures welding quality, and thus extends the service life of the heat sink.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A laser-welded heat sink, characterized by, This includes a heatsink base and heatsink fins that are attached sequentially from bottom to top; The heat dissipation fin assembly includes multiple fins stacked and fastened side by side at intervals, and the fins are provided with multiple rows of laser welding points at intervals from one end to the other. The laser welding points include: The basic welding area with a diameter of 0.8 mm or more, and the welding edge heat diffusion transition groove area with an area of ​​1.0 x 1.2 mm or more; The heat dissipation fins have a 90° bend, which fits into the base. After the bent portion of the fin is attached to the base, a laser source is used to pass through the transition zone of the welding groove to weld no less than 50 laser welding points in the basic welding area.

2. A laser welded heat sink according to claim 1, wherein, Located on the fins, multiple fins are stacked to form a fin group by stamping with a mold, and a laser welding groove is provided on the upper surface.

3. A laser welded finned heat sink according to claim 2, wherein, The adjacent heat dissipation fin groups are provided with multiple welding transition grooves, and the bottom end of the transition grooves is provided with laser welding points.

4. The laser welded fin of claim 3, wherein, The distance between adjacent transition grooves shall not be less than 1.0 mm.

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