Welding clamp suitable for free positioning of Pin needle type power module terminal

Abstract

The utility model discloses a welding fixture suitable for free positioning of a Pin pin type power module terminal, which is used for welding and positioning of a Pin pin type power module and comprises a bottom plate and a clamping plate. A positioning concave table used for positioning the base plate is arranged on the bottom plate, a bottom open groove is formed in the upward surface of the positioning concave table, and a first positioning part is further arranged on the positioning concave table; the clamping plate is provided with a plurality of Pin holes, and the downward surface of the clamping plate is provided with a second positioning part used for positioning the substrate and the bottom plate. According to the scheme, the problem of Pin accurate positioning is solved, a multi-hole-site free positioning scheme is innovatively designed, the limitation of a specific power module is broken through, the method is suitable for free positioning of respective Pin type power module terminals, allowance is provided for optimization design of the power module terminals, and the method is suitable for large-scale popularization and application. The preparation cost of the Pin needle type power module can be saved, the production efficiency is improved, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of semiconductor device production, especially to a welding fixture suitable for the free positioning of Pin needle type power module terminals. BACKGROUND

[0002] Power semiconductor modules can contain power diodes, fast diodes, thyristors, MOSFET or IGBT modules. The complexity of the internal wiring determines that it can realize from a single semiconductor function to up to twenty functions. In addition, some modules also contain passive components such as temperature sensors, resistors and capacitors, and it can also integrate the driver function together, which we call intelligent power module (IPM).

[0003] The current Pin needle type power module welding process includes the following steps: first, prepare the welding material and clean the surface of the power module and the Pin needle; then, apply flux to the welding area to improve wettability; then, set the welding equipment parameters according to the process requirements, accurately insert the Pin needle into the pad hole, and perform soldering, reflow welding or wave soldering.

[0004] In the process of implementing the present application, the inventors found that there are often at least the following problems in this process:

[0005] 1. Thermal expansion coefficient difference problem: due to the difference in thermal expansion coefficient between the power device and the bottom plate material, poor connection between the module and the bottom plate may occur during welding, thereby damaging the device or making it difficult to disassemble.

[0006] 2. Welding monitoring problem: it is difficult to monitor the welding quality of the Pin needle in real time during the welding process, and the relevant situation cannot be recorded and fed back in time, thereby limiting the immediate optimization and adjustment of the welding process.

[0007] 3. Positioning problem: accurate positioning of the Pin needle is the core link of the welding process, and if the positioning is not accurate, it will directly affect the welding quality, and the existing Pin needle type power module has the problem of inaccurate positioning in the welding process.

[0008] 4. Limiting problem: in the welding process, the limiting control of the Pin needle is one of the keys to ensuring the stability of the welding, and any limiting failure will affect the welding effect, and the existing Pin needle type power module has the problem of limiting failure of the Pin needle in the welding process, thereby reducing the quality of the Pin needle type power module product.

[0009] 5. Pin needle hole position limitation problem: the current Pin needle welding process is often limited by the design of a specific power module, and a specific power module with different Pin needle hole positions needs to use a specific welding fixture to position the Pin needle, which has high tool cost and is troublesome to manage and use.

[0010] In view of this, how to solve at least one of the above problems existing in the conventional soldering process of pin-type power modules becomes the subject to be studied and solved by the present invention. Utility Model Content

[0011] The utility model aims to provide a welding fixture suitable for freely positioning pin-type power module terminals.

[0012] To achieve the above-mentioned object, the technical solution adopted by the present invention is to propose a welding fixture suitable for freely positioning the terminals of a pin-type power module, which is used for welding and positioning the pin-type power module. The pin-type power module has a substrate and pins. The innovative features of the fixture are:

[0013] The welding fixture comprises a base plate and a clamping plate.

[0014] The bottom plate is provided with a positioning recess for positioning the substrate, an upward surface of the positioning recess is provided with a bottom groove, and the positioning recess is further provided with a first positioning portion.

[0015] The clamping plate is provided with an opening area for positioning the PIN pin, and a plurality of PIN pin openings are arranged in an array in the opening area. The clamping plate is assembled into the positioning recess of the base plate, and the downward surface of the clamping plate is provided with a second positioning portion for positioning the substrate and the base plate.

[0016] The base plate and the clamping plate are both provided with assembly direction indicating parts for determining the assembly direction.

[0017] The relevant contents of this utility model are explained as follows:

[0018] 1. The implementation of the above technical solutions of the present invention aims at the problem that the current welding process of the Pin-type power module may cause poor connection between the module and the base plate, thereby damaging the device or making the device difficult to disassemble. A bottom groove is set on the positioning recess of the base plate to facilitate the removal and placement of the power module and prevent connection; to address the current problem of Pin hole position limitation, an opening area with multiple Pin holes arranged in an array on the clamping plate is designed, which can be suitable for the free positioning of the Pins. When the Pin welding position is changed when the layout of the power module is optimized, there is no need to redesign the clamping plate, which greatly saves resources and improves efficiency; to address the positioning and limiting problems of the substrate and Pin, a first positioning part is set on the positioning recess, and a second positioning part for positioning the substrate and the base plate is correspondingly provided on the clamping plate, so as to ensure that the substrate and Pin can be well positioned and limited during the welding process to avoid displacement and offset, thereby ensuring that product quality is improved. Through the innovative joint design of the various parts of the above welding fixture, the welding process of pin-type power modules can save costs, improve production efficiency and enhance product quality.

[0019] 2. In the above technical solution, an observation window is further provided on the side of the clamp. When the welding fixture positions the substrate and pins of the pin-type power module for welding, the welding conditions of the substrate and pins of the pin-type power module are observable, thereby facilitating timely observation of the pin welding conditions, real-time monitoring of the pin welding quality, and timely recording and feedback of relevant conditions, thereby enabling immediate optimization and adjustment of the welding process of the pin-type power module product.

[0020] 3. In the above technical solution, the observation window is an open square window opened on one side of the length direction of the clamp, so as to provide an observation window that is large enough and does not damage the overall structure of the welding fixture, and makes it possible to observe the welding quality of all pins more comprehensively.

[0021] 4. In the above technical solution, the base plate is a rectangular plate-shaped structure, the positioning recess is a rectangular recessed area provided on the upward surface of the base plate, and the first positioning portions are located at the four corners of the rectangular positioning recess. This structure is used to align and position conventional pin-type power modules of most specifications.

[0022] 5. In the above technical solution, the bottom groove is a square groove, an arc groove or a broken line groove provided on the upward surface of the positioning recess, preferably a square groove.

[0023] 6. In the above technical solution, the first positioning portion is a quarter-shaped circular notch provided at the four corners of the rectangular positioning recess, so that the first positioning portion matches the characteristics of the positioning recess, facilitating production and positioning.

[0024] 7. In the above technical solution, the clamping plate is rectangular in structure, and the second positioning features are located at the four corners of the rectangular clamping plate. The second positioning features comprise a first and second stepped bosses. The first bosses engage with the irregularly shaped circular notches of the first positioning feature, and the second bosses abut against the base plate within the positioning bosses to secure the pin-type power module. This structure ensures that the second positioning features mate with the positioning recesses and the first positioning features on the recesses, making the positioning between the base plate and the clamping plate, and the positioning of the pin-type power module base plate, faster, more accurate, and more secure.

[0025] 8. In the above technical solution, the assembly direction indicating portion is a positioning notch provided on the base plate and the clamping plate at the same azimuth angle, so as to quickly determine the assembly direction and avoid assembly errors.

[0026] 9. In the above technical solution, the pin hole is provided with a 30° chamfer at the position where the pin is inserted, so that the pin can enter the pin hole more accurately and smoothly.

[0027] 10. In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements, unless otherwise expressly specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] 11. In the present invention, the term "up" in "upward" indicates the direction in which the pin points upward after the pin is positioned on the substrate by a welding fixture in a pin-type power module. In addition, the terms "center", "up", "down", "axial", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientation or positional assembly relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0029] 12. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0030] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0031] 1. This utility model addresses the problem that the current soldering process of pin-type power modules may cause poor connection between the module and the base plate, thereby damaging the device or making it difficult to disassemble the device. A bottom groove is provided on the positioning recess of the base plate to facilitate the removal and placement of the power module and prevent connection.

[0032] 2. To address the current problem of limited pin hole positions, this utility model designs a pin hole area with multiple array-arranged pin holes on the clamping plate, which can be suitable for free positioning of the pins. When the pin soldering position is changed during the layout optimization of the power module, there is no need to redesign the clamping plate, which greatly saves resources and improves efficiency.

[0033] 3. To address the positioning and limiting issues of the substrate and pins, this utility model provides a first positioning portion on the positioning recess, and a corresponding second positioning portion on the clamping plate for positioning the substrate and base plate. This ensures that the substrate and pins are well positioned and limited during the welding process, preventing displacement and offset, thereby ensuring improved product quality.

[0034] 4. In summary, the utility model not only solves the problem of precise Pin positioning through the innovative joint design of the various parts of the above welding fixture, but also innovatively designs a solution for free positioning of multiple holes, breaking through the limitations of specific power modules, and is suitable for the free positioning of each Pin-type power module terminal, providing a margin for the optimized design of the power module terminal, so that the preparation of Pin-type power modules can save costs, improve production efficiency, and enhance product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A three-dimensional schematic diagram of an embodiment of the utility model;

[0036] Figure 2 This is a three-dimensional schematic diagram of a splint in an embodiment of the present utility model;

[0037] Figure 3 This is a three-dimensional schematic diagram of a Pin-type power module in an embodiment of the present utility model;

[0038] Figure 4 It is the three-dimensional schematic view of the bottom plate in the embodiment of the utility model;

[0039] Figure 5 It is the three-dimensional sectional view schematic view of the embodiment of the utility model.

[0040] The following is the schematic diagram of each component in the drawing:

[0041] 10 bottom plate

[0042] 11 positioning recess

[0043] 12 bottom slot

[0044] 13 first positioning part

[0045] 131 circle notch

[0046] 14 assembly direction schematic part

[0047] 20 clamping plate

[0048] 21 aperture region

[0049] 22 Pin needle aperture

[0050] 23 second positioning part

[0051] 231 first boss

[0052] 232 second boss

[0053] 24 assembly direction schematic part

[0054] 25 observation window

[0055] 30 Pin needle type power module

[0056] 31 base plate

[0057] 32 Pin needle. DETAILED DESCRIPTION

[0058] In order to make the above purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. But the present application can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0059] The present invention aims to solve the problems of thermal expansion coefficient difference, welding monitoring, positioning, limiting and pin hole position limitation in the current welding process of pin-type power module 30, so as to provide an innovatively designed welding fixture suitable for free positioning of pin-type power module terminals.

[0060] The embodiment of the present invention provides a welding fixture suitable for freely positioning the terminals of a pin-type power module, which is used for welding and positioning the pin-type power module 30. The pin-type power module 30 includes a substrate 31, a pin 31, and a Figures 1 to 5 As shown, the welding fixture includes a base plate 10 and a clamping plate 20 .

[0061] like Figure 4 As shown, a positioning recess 11 for positioning the substrate 31 is provided on the bottom plate 10 , a bottom groove 12 is provided on the upward surface of the positioning recess 11 , and a first positioning portion 13 is further provided on the positioning recess 11 .

[0062] like Figure 2 As shown, the splint 20 is provided with an opening area 21 for positioning the PIN needle 31, and a plurality of PIN needle openings 22 are arranged in an array in the opening area 21. The splint 20 is assembled into the positioning recess 11 of the base plate 10, and the downward surface of the splint 20 is provided with a second positioning portion 23 for positioning the substrate 31 and the base plate 10.

[0063] Both the base plate 10 and the clamping plate 20 are provided with an assembly direction indicating portion 1424 for determining the assembly direction.

[0064] Through the implementation of the utility model embodiment, in view of the problem that the present Pin needle type power module 30 welding process may cause poor connection between the module and the bottom plate 10, and further damage the device or make the device difficult to disassemble, the bottom slot 12 is arranged on the positioning recess 11 of the bottom plate 10, so as to facilitate the taking and placing of the power module and prevent the connection from being generated; in view of the present Pin needle hole position limiting problem, the hole region 21 with a plurality of arrayed Pin needle holes 22 is designed on the clamping plate 20, which can be suitable for the free positioning of the Pin needle 31, and the Pin needle 31 welding position is changed when the power module is laid out and optimized, so that the clamping plate 20 does not need to be redesigned, which greatly saves resources and improves efficiency; in view of the positioning and limiting problems of the substrate 31 and the Pin needle 31, the first positioning part 13 is arranged on the positioning recess 11, and the second positioning part 23 for positioning the substrate 31 and the bottom plate 10 is correspondingly arranged on the clamping plate 20, so as to ensure that the substrate 31 and the Pin needle 31 can be well positioned and limited during the welding process, avoiding displacement and deviation, thereby ensuring that the product quality is improved. Through the innovative combined design of each part of the welding fixture, the welding process of the Pin needle type power module 30 can save cost, improve production efficiency and improve product quality.

[0065] In the utility model embodiment, the observation window 25 is further arranged on the side edge of the clamping plate 20, and the welding position of the substrate 31 and the Pin needle 31 of the Pin needle type power module 30 is in an observable state after the welding fixture is positioned, so that the welding condition of the substrate 31 and the Pin needle 31 of the Pin needle type power module 30 is in an observable state, thereby facilitating the timely observation of the welding condition of the Pin needle 31, the real-time monitoring of the welding quality of the Pin needle 31, the timely recording and feedback of related conditions, and the immediate optimization and adjustment of the welding process of the Pin needle 31 type power module 30 product.

[0066] In the utility model embodiment, the observation window 25 is an open square window arranged on one side of the clamping plate 20 in the length direction, so as to provide a large enough observation window 25 without damaging the overall structure of the welding fixture, and the welding quality of all the Pin needles 31 can be observed, which is more comprehensive.

[0067] In the utility model embodiment, the bottom plate 10 is a rectangular plate structure, the positioning recess 11 is a rectangular recess region arranged on the upward surface of the bottom plate 10, and the first positioning part 13 is arranged at the four corners of the rectangular positioning recess 11. This structure is used for matching and positioning the conventional and most specifications of the Pin needle type power module 30.

[0068] In the utility model embodiment, the bottom slot 12 is a square slot, an arc-shaped slot or a fold line-shaped slot arranged on the upward surface of the positioning recess 11, and preferably a square slot.

[0069] In the embodiment of the present invention, the first positioning portion 13 is a quarter-shaped circular notch 131 provided at the four corners of the rectangular positioning recess 11, so that the first positioning portion 13 matches the characteristics of the positioning recess 11, which is convenient for production and positioning.

[0070] In this embodiment of the present invention, the clamping plate 20 is rectangular in structure, and the second positioning portions 23 are located at the four corners of the rectangular clamping plate 20. The second positioning portion 23 comprises a stepped first boss 231 and a second boss 232. The first boss 231 engages with the irregular circular notch 131 of the first positioning portion 13 for positioning, while the second boss 232 abuts against the base plate 31 within the positioning boss to secure the pin-type power module 30. This structure aligns the second positioning portion 23 with the positioning recess 11 and the first positioning portion 13 on the positioning recess 11, making the positioning between the base plate 10 and the clamping plate 20, and the positioning of the base plate 31 of the pin-type power module 30, faster, more accurate, and more secure.

[0071] In the embodiment of the present invention, the assembly direction indicating portion 1424 is a positioning notch provided at the same azimuth angle on the base plate 10 and the clamping plate 20, so as to quickly determine the assembly direction and avoid assembly errors.

[0072] In the embodiment of the present invention, the PIN opening 22 is provided with a 30° chamfer at the position where the PIN 31 is inserted, so that the PIN 31 can enter the PIN opening 22 more accurately and smoothly.

[0073] In addition, the technical solution of the present invention is introduced with one of the detailed embodiments.

[0074] In this detailed embodiment, a welding fixture suitable for freely positioning pin-type power module terminals is proposed, which includes a base plate 10 and a clamping plate 20 of a rectangular structure.

[0075] like Figure 4 As shown, in this detailed embodiment, a rectangular positioning recess 11 is provided on the base plate 10, and a quarter-shaped irregular circular notch 131 is provided at the four corners of the positioning recess 11 to serve as a first positioning portion 13, and a plurality of parallel rectangular bottom grooves 12 are provided on the upward surface of the positioning recess 11, and a positioning notch is provided at one corner of the base plate 10 as an assembly direction indication portion 1424.

[0076] like Figure 2As shown in this detailed embodiment, the clamping plate 20 is provided with a rectangular opening area 21. The opening area 21 is arrayed with multiple pin holes 22 with 30° chamfers. The downward-facing surface of the clamping plate 20 is provided at the four corners with first bosses 231 for positioning the base plate 10 and the clamping plate 20, and second bosses 232 for positioning the base plate 31. The first bosses 231 are located outside the four corners and engage with the quarter-circular notches 131 at the four corners of the positioning recess 11. The first bosses 231 and the second bosses 232 can extend to connect the four corners of the clamping plate 20, forming a step-like shape.

[0077] Through the implementation of the above embodiments, the problems of thermal expansion coefficient difference, welding monitoring, positioning, limiting and pin hole position limitation existing in the current soldering process of the pin-type power module 30 are solved, thereby achieving the purpose of the present utility model.

[0078] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A welding fixture suitable for freely positioning a pin-type power module terminal, used for welding and positioning a pin-type power module (30), wherein the pin-type power module (30) comprises a substrate (31) and a pin (31), and is characterized in that: The welding fixture comprises a base plate (10) and a clamping plate (20); The bottom plate (10) is provided with a positioning recess (11) for positioning the substrate (31), the upward surface of the positioning recess (11) is provided with a bottom groove (12), and the positioning recess (11) is also provided with a first positioning portion (13); The clamping plate (20) is provided with an opening area (21) for positioning the pin needle (31), and a plurality of pin needle openings (22) are arranged in an array in the opening area (21). The clamping plate (20) is assembled into the positioning recess (11) of the base plate (10), and a second positioning portion (23) for positioning the base plate (31) and the base plate (10) is provided on the downward surface of the clamping plate (20); The base plate (10) and the clamping plate (20) are both provided with an assembly direction indicating portion (14) (24) for determining the assembly direction.

2. A welding fixture suitable for freely positioning pin-type power module terminals according to claim 1, characterized in that: An observation window (25) is also provided on the side of the clamp (20), so that when the substrate (31) and the pin (31) of the pin-type power module (30) are positioned for welding by the welding fixture, the welding conditions of the substrate (31) and the pin (31) of the pin-type power module (30) can be observed.

3. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 2, characterized in that: The observation window (25) is an open square window provided on one side of the length direction of the clamping plate (20).

4. A welding fixture suitable for freely positioning pin-type power module terminals according to any one of claims 1 to 3, characterized in that: The bottom plate (10) is a rectangular plate-shaped structure, the positioning recess (11) is a rectangular recessed area provided on the upper surface of the bottom plate (10), and the first positioning portion (13) is provided at the four corners of the rectangular positioning recess (11).

5. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 4, characterized in that: The bottom opening (12) is a square groove, an arc groove or a broken line groove provided on the upward surface of the positioning recess (11).

6. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 4, characterized in that: The first positioning portion (13) is a quarter-shaped irregular circular notch (131) provided at the four corners of the rectangular positioning recess (11).

7. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 6, characterized in that: The clamping plate (20) is a rectangular structure. The second positioning portion (23) is arranged at the four corners of the rectangular clamping plate (20). The second positioning portion (23) has a first boss (231) and a second boss (232) in a stepped shape. The first boss (231) is engaged with the irregular circular notch (131) of the first positioning portion (13) for positioning. The second boss (232) abuts against the substrate (31) in the positioning boss to fix the pin-type power module (30).

8. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 7, characterized in that: The assembly direction indicating portion (14) (24) is a positioning notch provided at the same azimuth angle on the base plate (10) and the clamping plate (20).

9. The welding fixture suitable for freely positioning pin-type power module terminals according to claim 1, characterized in that: The pin opening (22) is provided with a 30° chamfer at a position where the pin (31) is inserted.

Images