Preforming soldering lug

Abstract

The embodiment of the utility model provides a preformed soldering lug. The preformed soldering lug is composed of a first welding part, a second welding part and a connecting part. The first welding part surrounds the second welding part, the outer edge of the first welding part is the outer edge of the soldering lug, the area surrounded by the inner edge of the first welding part accommodates the second welding part, and the inner edge is connected with the second welding part through the connecting part; the second welding part is located in an area surrounded by the inner edge of the first welding part and is separated from the first welding part, and the second welding part is connected with the inner edge of the first welding part through the connecting part; and the connecting part is connected with the first welding part and the second welding part. According to the preformed soldering lug adopting the scheme, the number of times of taking, positioning and placing the soldering lug in the welding process is reduced, the welding efficiency is improved, and meanwhile, the packaging and transportation cost is reduced.

Description

Technical Field

[0001] This utility model generally relates to the field of welding technology, and more specifically, to a preformed welding sheet structure. Background Technology

[0002] Solder paste is a commonly used soldering material in the soldering field. It is primarily used in the surface mount technology (SMT) industry for soldering surface-mount resistors, capacitors, integrated circuits (ICs), and other electronic components onto printed circuit boards (PCBs). Soldering involves first applying the solder paste to the PCB, and then performing the soldering process. Figure 1 As shown, in wireless base station products, the PCB motherboard needs to be soldered to a metal plate for heat dissipation. Simultaneously, some high-power devices on the PCB motherboard, such as the amplifier (PA) shown in the figure, which are soldered to the PCB motherboard via PA daughterboards, also require heat dissipation. To solder these devices to the metal plate, the PCB motherboard has a cutout area to accommodate the PA. Because the PA is relatively large, its thickness usually exceeds the thickness of the PCB motherboard. Therefore, after passing through the cutout area of ​​the PCB motherboard, a groove of corresponding depth needs to be made in the metal plate to accommodate the protruding part of the PA. During soldering, solder paste is applied to the contact surface between the motherboard and the metal plate for soldering the motherboard, and solder pads are placed at the bottom of the groove in the metal plate for soldering the PA. Figure 2 for Figure 1 The image shows a top view of the metal plate. The small rectangular squares in the image represent applied solder paste. These small squares are for illustrative purposes only; the solder paste could also cover the entire metal plate.

[0003] However, in this situation, soldering around the PA groove on the metal plate with solder paste can easily lead to short circuits and burnout of the PA. The solution is to use pre-formed solder pads instead of solder paste. For example... Figure 3 , 4 Taking the two preformed welding pieces shown as an example, among them Figure 4 The rectangular ring-shaped solder pad on the left is placed on the contact surface between the metal plate and the motherboard for soldering the PCB motherboard. Figure 4 The rectangular solder pad on the right is placed at the bottom of the groove and is used for soldering PA. Solder pads, compared to applying solder paste, are better at ensuring the accuracy of solder volume and the amount of flux applied. Therefore, using... Figure 4 The solder pads shown replace solder paste for soldering the PCB motherboard and PA daughterboard, reducing the risk of PA short circuits and burnout. However, using these pre-formed solder pads adds the steps of picking up and positioning the pads compared to solder paste application, especially when two pads are needed, requiring an additional picking and positioning operation. Furthermore, the two solder pads are packaged and transported separately, further increasing costs. Utility Model Content

[0004] This invention provides a preformed welding sheet to solve the problems of numerous sheet removal and positioning operations, and high packaging and transportation costs.

[0005] To address this, the present invention employs a pre-formed welding sheet comprising three parts: a first welding part, a second welding part, and a connecting part. The first welding part surrounds the second welding part, with its outer edge forming the outer edge of the welding sheet. The area enclosed by the inner edge of the first welding part accommodates the second welding part, and the inner edge connects to the second welding part via the connecting part. The second welding part is located within the area enclosed by the inner edge of the first welding part and is spaced apart from it. The second welding part is connected to the inner edge of the first welding part via the connecting part. The connecting part connects the first and second welding parts. This pre-formed welding sheet integrates two separate welding sheets corresponding to two welding positions into a single sheet, reducing the number of times the sheet needs to be picked up and positioned during welding, thus improving welding efficiency and reducing packaging and transportation costs. Furthermore, the easily separable connecting part allows the first and second welding parts, corresponding to different welding positions, to be easily separated and placed at their respective welding positions. Therefore, a single welding sheet provides the welding sheet needs for two different welding positions, further improving welding efficiency.

[0006] In some embodiments, the connecting portion has two or more parts.

[0007] In some embodiments, the connecting portion is a strip-shaped connecting strip or a dot-shaped connecting strip.

[0008] In some embodiments, the connecting portions are symmetrically distributed with respect to the center of the second welded portion.

[0009] In some embodiments, the width of the connection between the connecting portion and the first weld portion and the second weld portion is 0.2-0.4 mm.

[0010] In some embodiments, the thickness of the solder sheet is 0.15 mm.

[0011] In some embodiments, the second weld portion is rectangular, and the inner edge of the first weld portion is approximately rectangular.

[0012] In some embodiments, the connecting portion is connected to the long rectangular side of the second welded portion and the long rectangular inner edge of the first welded portion; and / or the connecting portion is connected to the short rectangular side of the second welded portion and the short rectangular inner edge of the first welded portion.

[0013] In some embodiments, the rectangular inner edge of the first welded portion is an arc that expands outward around the four corners.

[0014] In some embodiments, the connecting portion connects the rectangular right-angled corner of the second welding portion and the inner arc edge of the first welding portion.

[0015] In some embodiments, the first weld portion has one or more mounting holes.

[0016] In some embodiments, the outer edge of the first welded portion is generally rectangular.

[0017] In some embodiments, the welding sheet is integrally formed.

[0018] The preformed welding sheet of this invention features a first welding part and a second welding part connected by a connecting part, which are easily separated. This allows one welding sheet to meet the welding needs of two welding sheets previously required, and it is also easy to position and separate. This not only reduces the number of times the sheet needs to be picked up and positioned, but also lowers packaging and transportation costs, while improving welding efficiency.

[0019] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0020] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0021] Figure 1 This is a side view of the PCB motherboard and PA being soldered using solder paste.

[0022] Figure 2 for Figure 1 A top view of the metal plate shown;

[0023] Figure 3 This is a side view of the PCB motherboard and PA being soldered using solder pads.

[0024] Figure 4 This is a schematic diagram of two solder pads used for soldering the PCB motherboard and soldering the PA, respectively.

[0025] Figure 5 This is a top view schematic diagram of a preformed solder sheet according to an embodiment of the present disclosure;

[0026] Figure 6 for Figure 5 A side view schematic diagram of the welding of the preformed weldment shown;

[0027] Figure 7This is a top view schematic diagram of a preformed solder sheet according to an embodiment of the present disclosure;

[0028] Figure 8 This is a top view schematic diagram of a preformed solder sheet according to an embodiment of the present disclosure;

[0029] Figure 9 for Figure 8 A schematic diagram of the preformed weldment shown;

[0030] Figure 10 This is a top view schematic diagram of a preformed solder sheet according to an embodiment of the present disclosure;

[0031] Figure 11 This is a top view of a metal plate according to an embodiment of the present disclosure.

[0032] Reference numerals: 1. PA; 2. PA sub-board; 3. PCB motherboard; 4. Metal plate; 5. Solder sheet; 6. Solder paste; 7. Groove; 8. Rectangular annular solder sheet; 9. Mounting hole; 10. Outer edge of the first welding part; 11. Inner edge of the first welding part; 12. First welding part; 13. Second welding part; 14. Connecting part; 15. Preformed solder sheet; 16. Hole; 17. Solder sheet placement area. Detailed Implementation

[0033] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0034] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment".

[0035] The following will combine Figures 5 to 11 Example embodiments of this disclosure are described below.

[0036] Figure 5This is a schematic diagram of a preformed weld sheet according to an embodiment of the present disclosure. As shown, the preformed weld sheet of the present disclosure consists of three parts: a first welding portion, a second welding portion, and a connecting portion. The first welding portion surrounds the second welding portion, the outer edge of the first welding portion is the outer edge of the weld sheet, the area enclosed by the inner edge of the first welding portion accommodates the second welding portion, and the inner edge is connected to the second welding portion via the connecting portion. The second welding portion is located within the area enclosed by the inner edge of the first welding portion and is spaced apart from the first welding portion. The second welding portion is connected to the inner edge of the first welding portion via the connecting portion. The connecting portion connects the first welding portion and the second welding portion.

[0037] like Figure 5 As shown, the preformed solder sheet has a rectangular shape, wherein the second welding part is rectangular, and the inner edge of the first welding part is also rectangular. It can be understood that the shape of the second welding part, and the inner and / or outer edges of the first welding part, can be adaptively varied according to the shape of the specific device and board surface. For example, the second welding part can also be circular, while the inner edge of the first welding part can be circular, rectangular, or other shapes, and the outer edge of the first welding part can be circular, rectangular, or other shapes.

[0038] like Figure 5 As shown, there are two connecting parts, each located at the midpoint of the long side of the second welded part's rectangle. It is understood that the number of connecting parts can be more than two; for example, it can be three, four, or any other arbitrary number. The position of the connecting parts is not limited to the midpoint of the long side of the second welded part's rectangle; they can also be located on either side of the long side. They can also be located at the midpoint of the short side of the second welded part's rectangle or other positions as needed. The number and position of the connecting parts only need to ensure a certain degree of rigid connection between the second welded part and the first welded part. Generally, from the perspective of connection stability, the connecting parts can be symmetrically distributed with respect to the center of the second welded part, for example, axially symmetrical or centrally symmetrical.

[0039] The connecting part is a strip-shaped connecting band, or it can be a dot-shaped connecting band. The connecting band has a certain width and length. The connecting part mainly facilitates the separation of the first welded part and the second welded part. If the width of the connection is too wide, it will be difficult to separate the two parts; if the width of the connection is too narrow, it may be difficult to maintain the connection stability of the second welded part. The width of the connection between the connecting band and the first and second welded parts is usually 0.2-0.4 mm, but it can be appropriately increased or decreased according to the actual application, such as the required solder sheet thickness and the size of the welded components.

[0040] In one embodiment of this disclosure, the thickness of the preformed weld sheet is 0.15 mm. It is understood that the thickness of the preformed weld sheet is not limited to this and can be adjusted according to actual welding needs.

[0041] In one embodiment of this disclosure, the first welded portion has one or more mounting holes. For example... Figure 5 The preformed solder piece shown has two symmetrical mounting holes at the outer edge of its first welding portion. These mounting holes correspond to the mounting holes on the metal plate and the mother plate, and in addition to assisting in the mounting between the metal plate and the mother plate, they can also be used to position the solder piece when placing it. The location of the mounting holes is not limited to the edge of the first welding portion; mounting holes can also be formed inside the area of ​​the first welding portion for the mounting or positioning of other components. Mounting holes can also be provided on the second welding portion.

[0042] In one embodiment of this disclosure, the preformed weld sheet is integrally formed. For example, the preformed weld sheet, including the first welding portion, the second welding portion, and the connecting portion, can be directly stamped from a single weld sheet by a stamping process. Alternatively, the preformed weld sheet of this disclosure can be manufactured by mold making.

[0043] Figure 6 for Figure 5 The diagram shown is a side view of the preformed weldment during welding. Figure 6 As shown, the pre-formed weld sheet is taken out and placed on the metal plate, and positioned on the metal plate at the corresponding position through the mounting holes. It should be noted that... Figure 6 The gaps between the connecting part and the first connecting part and the second connecting part in the side view diagram shown are only for the convenience of showing the three different parts mentioned above. In fact, the connecting part and the first connecting part and the second connecting part are continuous in the side view direction.

[0044] After the preformed solder pad is placed, the PCB motherboard and PA daughterboard press the preformed solder pad towards the metal plate. Simultaneously, the PA device on the PA daughterboard further presses the second solder portion of the preformed solder pad towards the bottom of the groove. The connection between the first and second solder portions breaks when the second solder portion is pressed into the groove, and the second solder portion separates from the first solder portion and is pressed to the bottom of the groove. Here, either the PCB motherboard presses the solder pad first, then the PA daughterboard is pressed down, or the PA daughterboard is first fixed to the PCB motherboard, for example, by welding or other fastening methods, and then the PCB motherboard with the PA daughterboard is directly pressed against the metal plate to press the solder pad. In this way, both the first and second solder portions are pressed firmly onto the metal plate, similar to placing the preformed solder pad on the metal plate and its groove. Figure 3 , 4 The two weld pieces shown are similar. At this point, the disconnected connection is either attached to the inner wall of the groove or to the bottom of the groove. Due to their limited number and area, they will not affect the welding.

[0045] Figure 7A preformed solder pad according to another embodiment of this disclosure is shown. (With) Figure 5 The difference in the welding piece shown is that, in this embodiment, the connecting part is connected to the four rectangular corners of the second welding part and the four rectangular corners of the inner edge of the corresponding first welding part.

[0046] Figure 8 Another embodiment of the preformed weld sheet of this disclosure is shown. Considering that when a rectangular groove is cut into a metal plate using a milling cutter, outwardly expanding arcuate groove edges surrounding the four right angles of the rectangular groove are generated due to the milling process, the rectangular inner edge of the first welding portion of the preformed weld sheet in this embodiment is designed with outwardly expanding arcuate inner edges surrounding the four corners to accommodate the arcuate groove edges generated at the four corners when the rectangular groove is machined by the milling cutter, such as... Figure 8 As shown. The connecting part connects the rectangular right-angled corner of the second welding part and the inner arc of the first welding part, respectively.

[0047] Figure 9 for Figure 8 A schematic diagram of the preformed weldment shown. Figure 9 As shown, in addition to the mounting holes at the edge of the first welding portion, the preformed weld sheet also has a varying number of holes in the internal region of the first welding portion. It is understood that the mounting holes at the edge of the first welding portion and the holes in the internal region of the first welding portion are not limitations on the preformed weld sheet of this disclosure; they can be provided or omitted depending on actual installation needs.

[0048] Figure 10 A preformed solder pad according to another embodiment of this disclosure is shown. (With) Figure 8 , Figure 9 The difference in the welding piece shown is that, in this embodiment, the connecting part is connected to the intersection of the rectangular long side and the arc edge of the inner edge of the first welding part and the rectangular long side of the corresponding second welding part.

[0049] In one embodiment of this disclosure, the size of the mounting holes for the preformed solder pads can be adjusted according to the mounting requirements of the motherboard, such as... Figure 10 As shown, it is relative to the previous Figure 5 , 7 The mounting hole shown in -9 should be large.

[0050] Figure 11 A top view of a metal plate according to an embodiment of this disclosure is shown. Considering cost and actual soldering requirements, solder pads can be used only near the PA device area, while solder paste is still used in other areas. For example... Figure 11 As shown, the dashed lines on the metal plate indicate the areas where the preformed solder pads of this disclosure are placed. Compared to using solder pads that cover the entire metal plate, limiting the size of the solder pads to the vicinity of the PA device area will greatly reduce costs. Figure 11It also demonstrates the arc-shaped groove edge produced at the right angle of the rectangle when a milling cutter is used to machine a rectangular groove. Figure 11 The metal plates shown can be used accordingly, such as Figure 8-10 The preformed solder pad shown is understandable. Figure 8-10 The area surrounding the inner edge of the first welding portion of the preformed weld sheet should be appropriately larger than the size of the groove area on the metal plate, and the size of the second welding portion of the preformed weld sheet should be appropriately smaller than the size of the groove area on the metal plate.

[0051] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, any combination of these technical features that does not contradict each other should be considered within the scope of this specification.

Claims

1. A preform soldering sheet, characterized in that: the soldering sheet is composed of a first soldering part, a second soldering part and a connecting part; the first soldering part surrounds the second soldering part, the outer edge of the first soldering part is the outer edge of the soldering sheet, the area surrounded by the inner edge of the first soldering part contains the second soldering part, and the inner edge is connected to the second soldering part through the connecting part; the second soldering part is located in the area surrounded by the inner edge of the first soldering part and is spaced apart from the first soldering part, and the second soldering part is connected to the inner edge of the first soldering part through the connecting part; and the connecting part connects the first soldering part and the second soldering part. The connecting part has two or more. The connecting part is a strip-shaped connecting band or a dot-shaped connecting band. The connecting part is symmetrically distributed relative to the center of the second soldering part. The width of the connecting part at the connection with the first soldering part and the second soldering part is 0.2-0.4 mm.

2. The soldering tab of claim 1, wherein: The thickness of the soldering sheet is 0.15 mm.

3. The soldering tab of claim 2, wherein:

7. The soldering sheet according to any one of claims 1-6, characterized in that:

4. The soldering tab of claim 2, wherein: The second soldering part is rectangular, and the inner edge of the first soldering part is rectangular.

5. The soldering tab of claim 4, wherein:

8. The soldering sheet according to claim 7, characterized in that:

6. The soldering tab of claim 5, wherein: The connecting part connects the long side of the rectangular second soldering part and the long side of the rectangular inner edge of the first soldering part, respectively; and / or the connecting part connects the short side of the rectangular second soldering part and the short side of the rectangular inner edge of the first soldering part, respectively.

9. The soldering sheet according to claim 7, characterized in that: The rectangular inner edge of the first soldering part is a circular arc that expands outward at the four corner positions and surrounds the corners.

10. The soldering sheet according to claim 9, characterized in that: The connecting part connects the corner position of the rectangular right angle of the second soldering part and the circular arc inner edge of the first soldering part, respectively.

11. The soldering sheet according to claim 9, characterized in that: The connecting part connects the long side of the rectangular second soldering part and the long side of the rectangular inner edge of the first soldering part, respectively; and / or the connecting part connects the short side of the rectangular second soldering part and the short side of the rectangular inner edge of the first soldering part, respectively. The first soldering part has one or more mounting holes.

13. The soldering sheet according to any one of claims 8-12, characterized in that: The outer edge of the first soldering part is rectangular. The soldering sheet is integrally formed.

12. The soldering tab of claim 10, wherein: ​ ​ ​ 14. The soldering lug of any one of claims 8-12, wherein: ​

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