Anti-gathering limiting device for DBC welding
By designing a combined structure of limiting frame and limiting block, the problems of coalescence and adhesion during DBC welding were solved, achieving high-quality and high-efficiency welding results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-03-06
AI Technical Summary
In existing technologies, DBC is prone to coalescence and adhesion during the soldering process due to factors such as solder paste flow and thermal expansion, which affects the soldering quality and positioning accuracy, and increases the risk of chipping.
Design an anti-agglomeration limiting device. Through the combination structure of limiting frame and limiting block, the edge and center intersection area of DBC are limited respectively to ensure that DBC maintains a stable position during welding and avoids agglomeration and adhesion.
It effectively prevents DBC from clustering and misaligning during welding, improves welding quality and stability, reduces safety risks, simplifies operation, and increases production efficiency.
Smart Images
Figure CN223971134U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of semiconductor packaging technology, and in particular to an anti-aggregation limiting device for DBC (Direct Bond Copper) soldering of IGBT modules. Background Technology
[0002] In the soldering process of IGBT modules, the positioning of the DBC (Digital Curtain Block) is one of the key factors affecting the soldering quality. An IGBT module undergoes a series of steps during a single soldering process, including base plate installation, DBC printing, DBC assembly, surface mounting, and reflow soldering. The soldering position of the DBC will have an irreversible impact on subsequent processes. Before soldering, a limiting frame is used to control the position of the DBC on the base plate, preventing it from spreading outwards and causing misalignment during the soldering process.
[0003] In existing technologies, a limiting frame is typically used to fix the edges of the DBC. Traditional limiting devices can only effectively fix the edge portion of the DBC. This is mainly achieved by using the limiting frame to surround the outer side of the four DBCs, and positioning the DBCs by contacting the protruding part of the inner edge of the limiting frame with the DBCs. However, there is no contact structure in the central area where the four DBCs intersect. The lack of limiting in the central area causes the solder paste to flow towards the center due to the depression in the middle of the base plate during soldering. This causes the DBCs to shift along with the solder paste and gather and connect towards the center. This cannot effectively prevent the four DBCs from changing position during the soldering process due to factors such as flux flow and solder paste flow. This results in the DBCs sticking together due to flux residue, affecting positioning accuracy and increasing the risk of DBC chipping. After the module is soldered, this will affect the overall process effect, causing inconsistent product quality and even damage.
[0004] To avoid this phenomenon, a new limiting device is needed that can effectively prevent the DBCs from clustering together during the welding process, ensuring that the four DBCs always remain in the predetermined position to avoid them connecting and improve the welding quality. Utility Model Content
[0005] In view of this, the purpose of this utility model is to propose an anti-agglomeration limiting device for DBC welding. Through the combined design of the limiting frame and the limiting block, the device simultaneously limits the edges and the central intersection area of the DBC, effectively preventing displacement of the DBC during welding, avoiding connection between the four DBC pieces, and ensuring the consistency and stability of the welding process. This solves the problems of DBC agglomeration, adhesion, and damage during welding.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] To achieve the above objectives, this utility model provides an anti-aggregation limiting device for DBC welding, comprising a limiting frame, a limiting block, and screws;
[0008] The inner wall of the limiting frame is provided with four positioning ribs extending towards the center. Threaded holes are provided in the area where the positioning ribs intersect. The positioning ribs distributed around the threaded holes are all provided with recessed grooves.
[0009] The limiting block includes a platform part and a protruding part. The platform part has a mounting hole in the center and is fixed to the threaded hole of the limiting frame by screws. The protruding parts are symmetrically distributed at the bottom of the platform part. When the limiting block is fixed to the limiting frame by screws, the protruding parts are embedded in the recessed slots and directly contact the bottom plate.
[0010] As a further embodiment of this utility model, the four positioning ribs extending towards the center on the limiting frame divide the interior of the limiting frame into welding areas for placing four DBCs, and the limiting frame is provided with several flanges that contact the outer edges of the DBCs in the welding areas.
[0011] As a further embodiment of this utility model, a gap is provided between the bottom of the positioning rib and the DBC to prevent direct contact. The gap between the bottom of the positioning rib and the DBC is maintained at more than 0.5 mm, and the distance between the two sides of the positioning rib and the edge of the DBC is not less than 0.3 mm. The extended bottom parts of the four positioning ribs of the limiting frame do not directly contact the DBC, and a certain gap is maintained between the two sides and the DBC to avoid the adhesion between the DBC and the limiting frame due to factors such as flux and thermal expansion.
[0012] As a further embodiment of this utility model, the protrusion is a four-section octagonal protrusion structure with a maximum width of 0.9mm on both sides. It is embedded in the recessed groove and directly contacts the base plate to prevent the DBC from shifting during the welding process, ensuring that the four DBCs maintain a 1mm gap and preventing them from gathering and connecting.
[0013] As a further embodiment of this utility model, the octagonal protrusion of the protrusion has a rounded corner transition at the corner, and the radius of the rounded corner does not exceed 0.1mm.
[0014] As a further embodiment of this utility model, the protrusion of the limiting block has a height of 3mm, ensuring that it passes through the limiting frame and contacts the bottom plate.
[0015] As a further embodiment of this utility model, the threaded hole of the limiting frame is a through hole, and the threaded hole and four grooves are arranged in the intersection area of the positioning rib to form an assembly positioning structure. Through the cooperation of the limiting block and the limiting frame, it is ensured that the DBC always maintains the correct position during the welding process.
[0016] As a further embodiment of this utility model, the hole diameter of the upper platform of the limiting block is 5mm, the screw is M5 specification, and the mounting hole diameter is adapted to the screw to fix the limiting block and the limiting frame, so as to prevent the limiting block from shifting or loosening during the welding process.
[0017] As a further embodiment of this utility model, the height of the upper surface of the DBC assembled on the base plate relative to the base plate is 0.95mm, the height of the leg of the limiting block is greater than the height of the positioning rib of the limiting frame, and the limiting block directly contacts the base plate through the protrusion of the leg, serving as a barrier to limit the DBC.
[0018] Compared with the prior art, the present invention proposes an anti-agglomeration limiting device for DBC soldering. Through the combined structural design of the limiting frame and the limiting block, it solves the problems of aggregation, adhesion and damage caused by solder paste flow during DBC soldering in the prior art. The present invention has the following beneficial effects:
[0019] 1. Effectively prevents DBCs from converging and connecting or becoming misaligned. This utility model's anti-convergence limiting device, through its designed limiting frame and limiting block structure, effectively restricts the relative positions of the four DBCs during the welding process, preventing them from converging or connecting due to factors such as welding temperature changes, flux flow, or thermal expansion. This ensures a stable gap between each DBC module, thereby avoiding welding defects or quality problems caused by positional misalignment during welding. By preventing DBC modules from converging or connecting, this utility model effectively reduces potential safety risks during welding, such as short circuits in welding equipment, thus ensuring the safety of the production environment.
[0020] 2. Improved stability during welding. The anti-aggregation limiting device of this utility model fixes the limiting block to the limiting frame with screws, ensuring that the DBC module is stably fixed throughout the welding process. This prevents the DBC from shifting or misaligning due to temperature fluctuations, mechanical vibrations, or external forces during welding, thereby greatly improving the stability and consistency of the welding process.
[0021] 3. Reduce welding defects. The anti-aggregation limiting device of this utility model can ensure that the gap between DBCs remains consistent at all times, avoiding welding defects caused by uneven gaps or workpiece misalignment, such as short circuits, incomplete welds, or poor weld contacts, thereby significantly improving welding quality.
[0022] 4. Simplifies welding operations and adapts to welding requirements of workpieces of different sizes. Because the frame structure and positioning components of the anti-aggregation limiting device of this invention can be adjusted according to the specific dimensions of the workpiece, it can adapt to DBC modules of different shapes and sizes, giving the limiting device strong versatility and meeting the requirements of various welding processes and workpieces. The simple structure and ease of installation allow operators to quickly and accurately fix the DBC module on the welding table, reducing manual adjustment time during the welding process, improving overall production efficiency. The precise positioning function also reduces the possibility of human error during welding, enhancing product consistency and reliability.
[0023] In summary, the anti-aggregation limiting device for DBC welding of this utility model can effectively prevent the aggregation and misalignment of DBC modules during the welding process, improve welding quality and stability, and has the advantages of high temperature resistance, strong material stability and strong adaptability, providing a reliable guarantee for high-quality and high-efficiency DBC welding.
[0024] These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings:
[0026] Figure 1 This is a three-dimensional structural diagram of an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0027] Figure 2 This is a top view of the limiting frame in an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0028] Figure 3 This is a top view of the assembly of the limiting block and the limiting frame in an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0029] Figure 4 This is a three-dimensional structural diagram of a limiting block installed on a limiting frame in an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0030] Figure 5This is a three-dimensional structural diagram of the limiting block in an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0031] Figure 6 This is a bottom view of the limiting block in an anti-aggregation limiting device for DBC welding according to an embodiment of the present invention.
[0032] Figure label:
[0033] 1-Limiting frame, 11-Positioning rib, 12-Welding area, 13-Threaded hole, 14-Recessed slot, 15-Flange, 2-Limiting block, 21-Platform part, 22-Protrusion part, 23-Round corner, 24-Mounting hole, 3-Screw, 4-DBC. Detailed Implementation
[0034] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.
[0036] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.
[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0038] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.
[0039] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0040] See Figures 1 to 6 As shown, an embodiment of this utility model provides an anti-aggregation limiting device for DBC welding, including a limiting frame 1, a limiting block 2, and screws 3. The inner wall of the limiting frame 1 has four positioning ribs 11 extending towards the center. Threaded holes 13 are provided in the area where the positioning ribs 11 intersect. Recessed slots 14 are provided on the positioning ribs 11 distributed around the threaded holes 13. The limiting block 2 includes a platform portion 21 and a protrusion portion 22. The platform portion 21 has a mounting hole 24 at its center, which is fixed to the threaded hole 13 of the limiting frame 1 by screws 3. The protrusion portions 22 are symmetrically distributed at the bottom of the platform portion 21. When the limiting block 2 is fixed to the limiting frame 1 by screws 3, the protrusion portions 22 are embedded in the recessed slots 14 and directly contact the base plate.
[0041] The anti-aggregation limiting device of this utility model fixes the limiting block 2 to the limiting frame 1 with screws 3, ensuring that the DBC 4 module is stably fixed throughout the welding process. This prevents the DBC 4 from shifting or misaligning due to temperature fluctuations, mechanical vibrations or external forces during the welding process, thereby greatly improving the stability and consistency of the welding process.
[0042] In this embodiment, the four positioning ribs 11 extending towards the center on the limiting frame 1 divide the interior of the limiting frame 1 into a welding area 12 for placing four DBC 4 pieces. The limiting frame 1 is provided with several flanges 15 that contact the outer side of the DBC 4 in the welding area 12.
[0043] The positioning rib 11 has a gap between its bottom and the DBC 4, which prevents direct contact. The gap between the bottom of the positioning rib 11 and the DBC 4 is maintained at more than 0.5 mm, and the distance between the two sides of the positioning rib 11 and the edge of the DBC 4 is not less than 0.3 mm. The extended bottom parts of the four positioning ribs 11 of the limiting frame 1 do not directly contact the DBC 4, and a certain gap is maintained between the two sides of the positioning rib 11 and the DBC 4 to avoid the adhesion between the DBC 4 and the limiting frame 1 due to factors such as flux and thermal expansion.
[0044] This utility model's anti-aggregation limiting device, through its designed limiting frame 1 and limiting block 2 structure, can effectively limit the relative positions of four DBC 4 modules during the welding process, preventing them from aggregating or connecting due to factors such as welding temperature changes, flux flow, or thermal expansion. This ensures a stable gap between each DBC 4 module, thereby avoiding welding defects or quality problems caused by positional misalignment during welding. By preventing the DBC 4 modules from aggregating or connecting, this utility model effectively reduces potential safety risks during welding, such as short circuits in welding equipment, thus ensuring the safety of the production environment.
[0045] In this embodiment, the protrusion 22 is a four-part octagonal protrusion structure with a maximum width of 0.9mm on both sides. It is embedded in the recessed slot 14 and directly contacts the base plate to prevent the DBC 4 from shifting during the welding process and to ensure that the four DBC 4 pieces maintain a 1mm gap to avoid them from gathering and connecting.
[0046] The anti-aggregation limiting device of this utility model can ensure that the gap between DBC 4 is always consistent, avoiding welding defects caused by uneven gap or workpiece misalignment, such as short circuit, poor welding or poor welding contact, thereby greatly improving the welding quality.
[0047] The octagonal protrusion of the protrusion 22 is rounded at the corners 23, with a radius of no more than 0.1 mm. The protrusion 22 of the limiting block 2 has a height of 3 mm, ensuring that it passes through the limiting frame 1 and contacts the base plate.
[0048] In this embodiment, the threaded hole 13 of the limiting frame 1 is a through hole. The threaded hole 13 and the four grooves are arranged in the intersection area of the positioning rib 11 to form an assembly positioning structure. Through the cooperation between the limiting block 2 and the limiting frame 1, it is ensured that the DBC 4 always maintains the correct position during the welding process. The hole diameter of the upper platform of the limiting block 2 is 5mm, the screw 3 is M5 specification, and the diameter of the mounting hole 24 is adapted to the screw 3 to fix the limiting block 2 and the limiting frame 1, preventing the limiting block 2 from shifting or loosening during the welding process.
[0049] The height of the upper surface of the DBC 4 assembled on the base plate relative to the base plate is 0.95mm. The height of the leg of the limiting block 2 is greater than the height of the positioning rib 11 of the limiting frame 1. The limiting block 2 directly contacts the base plate through the protrusion of the leg, and acts as a barrier to limit the DBC 4.
[0050] The frame structure and positioning components of this utility model's anti-aggregation limiting device can be adjusted according to the specific dimensions of the workpiece, adapting to DBC 4 modules of different shapes and sizes. This gives the limiting device strong versatility, meeting the requirements of various welding processes and workpieces. Its simple structure and ease of installation allow operators to quickly and accurately fix the DBC4 module on the welding table, reducing manual adjustment time during welding and improving overall production efficiency. The precise positioning function also reduces the possibility of human error during welding, enhancing product consistency and reliability.
[0051] This invention proposes an anti-agglomeration limiting device for DBC soldering, which effectively prevents DBC 4 from agglomerating and misaligning towards the center. Through the combined structural design of the limiting frame 1 and the limiting block 2, it solves the problems of aggregation, adhesion, and damage to DBC 4 caused by solder paste flow during soldering in existing technologies. This invention improves soldering quality and stability, and possesses advantages such as high-temperature resistance, strong material stability, and strong adaptability, providing a reliable guarantee for high-quality and high-efficiency DBC 4 soldering.
[0052] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.
[0053] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A bunching prevention stop device for DBC soldering, characterized by, It comprises a limiting frame (1), a limiting block (2) and a screw (3); The inner wall of the limiting frame (1) is provided with four positioning ribs (11) extending to the center, and the intersection area of the positioning ribs (11) is provided with a threaded hole (13). The positioning ribs (11) around the threaded hole (13) are provided with recessed grooves (14). The limiting block (2) comprises a platform part (21) and a protruding part (22). The center of the platform part (21) is provided with a mounting hole (24) fixed with the threaded hole (13) of the limiting frame (1) through the screw (3). The protruding part (22) is symmetrically distributed at the bottom of the platform part (21). When the limiting block (2) is fixed with the limiting frame (1) through the screw (3), the protruding part (22) is embedded in the recessed groove (14) and directly contacts with the bottom plate.
2. The anti-pooling stop device for DBC soldering of claim 1, wherein, The four positioning ribs (11) extending to the center arranged on the limiting frame (1) divide the inner part of the limiting frame (1) into four welding areas (12) for placing four DBCs (4). The limiting frame (1) is provided with a plurality of flanges (15) in contact with the outer side of the DBC (4) in the welding area (12).
3. The anti-pooling stop device for DBC soldering of claim 2, wherein, The bottom of the positioning rib (11) and the DBC (4) are not in direct contact, and the gap between the bottom of the positioning rib (11) and the DBC (4) is maintained above 0.5mm.
4. The anti-pooling stop device for DBC soldering of claim 3, wherein, The distance between the two sides of the positioning rib (11) and the edge of the DBC (4) is not less than 0.3mm. The bottom extension part of the four positioning ribs (11) of the limiting frame (1) does not directly contact with the DBC (4), and maintains a certain gap between the two sides and the DBC (4).
5. The anti-pooling stop device for DBC soldering of claim 4, wherein, The protruding part (22) is a protruding structure with an octagonal cross section. The maximum width of the protruding structure on both sides is 0.9mm, which is embedded in the recessed groove (14) and directly contacts with the bottom plate.
6. The anti-pooling stop device for DBC soldering of claim 5, wherein, The octagonal protrusion of the protruding part (22) is a round corner (23) transition at the corner. The radius of the round corner (23) is not more than 0.1mm.
7. The anti-pooling stop device for DBC soldering of claim 6, wherein, The height of the protruding part (22) of the limiting block (2) is 3mm, and the protruding part (22) contacts with the bottom plate through the limiting frame (1).
8. The anti-pooling stop device for DBC soldering of claim 7, wherein, The threaded hole (13) of the limiting frame (1) is a through hole. The threaded hole (13) and the four grooves are arranged at the intersection area of the positioning rib (11), forming an assembly positioning structure.
9. The anti-pooling stop device for DBC soldering of claim 8, wherein, The hole diameter of the upper end platform of the limiting block (2) is 5mm, the screw (3) is M5 specification, and the mounting hole (24) diameter is matched with the screw (3) to fix the limiting block (2) and the limiting frame (1).
10. The anti-pooling stop device for DBC soldering of claim 7, wherein, The height of the upper surface of the DBC (4) assembled on the bottom plate relative to the bottom plate is 0.95mm. The leg height of the limiting block (2) is greater than the height of the positioning rib (11) of the limiting frame (1). The protruding part of the leg of the limiting block (2) directly contacts with the bottom plate.