Welding tool for module signal terminal

Abstract

The utility model relates to a welding tool for a module signal terminal, which comprises a welding tool body used for clamping when signal terminal reflow soldering is carried out on a power module, and the welding tool body is arranged on a substrate of the power module. The welding tool body is composed of a first cover plate and a second cover plate which are sequentially arranged from top to bottom and are the same in shape, a plurality of installation through holes corresponding in position are formed in the first cover plate and the second cover plate respectively, and metal blocks with the same number as the through holes are installed at the positions, between the first cover plate and the second cover plate, of the installation through holes respectively. The metal block is fixedly connected with a positioning column installed in a positioning hole of the substrate through a bolt and a gasket, the first cover plate and the second cover plate are further provided with a plurality of open holes corresponding in position, the positions of the open holes correspond to the positions of signal terminals on the substrate, and the open holes are used for conveniently inserting the signal terminals. And the head part and the tail part of the signal terminal are respectively positioned through the first cover plate and the second cover plate.

Description

Technical Field

[0001] The utility model relates to a welding tool for module signal terminals, belonging to the technical field of semiconductor module packaging. Background Art

[0002] In the signal terminal packaging process of traditional industrial-grade power modules, since the module design and process are relatively simple, only a good soldering process and how to save production time need to be considered, and most of them use an integrated packaging fixture for one-step reflow soldering. This method is not suitable for modern more flexible and complex automotive-grade large power modules. At this stage, automotive-grade modules require more stringent process production processes and will face a variety of complex packaging structures during the early process evaluation, such as more diverse substrate designs, signal terminal structures with better welding performance, etc. If any link is not properly operated, the product packaging cannot be completed with high quality. Therefore, for the packaging fixtures of signal terminals used in automotive-grade modules, flexibility, precision, high efficiency, and high quality are a big test.

[0003] Therefore, a welding tool for module signal terminals is designed to overcome the above problems. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a welding tool for module signal terminals which has a simple structure, precise welding and can flexibly cope with various complex packaging structures.

[0005] The utility model is realized through the following technical scheme: a welding tool for module signal terminals, comprising a welding tool body for clamping when performing reflow welding on the signal terminals of a power module, the welding tool body being installed on the substrate of the power module, the welding tool body being composed of a first cover plate and a second cover plate which are arranged in sequence from top to bottom and have the same shape, a plurality of mounting through holes corresponding to positions are respectively arranged on the first cover plate and the second cover plate, and metal blocks having the same number as the through holes are respectively installed at the mounting through holes between the first cover plate and the second cover plate, the metal blocks are fastened to positioning columns installed in positioning holes of the substrate through bolts and washers, a plurality of openings corresponding to positions are also arranged on the first cover plate and the second cover plate, the positions of the openings correspond to the positions of the signal terminals on the substrate, for facilitating the plugging of the signal terminals, and positioning the head and tail of the signal terminals respectively through the first cover plate and the second cover plate.

[0006] Preferably, a copper-clad ceramic substrate fixing frame is provided between the substrate and the second cover plate, the copper-clad ceramic substrate fixing frame is provided with a first through hole for fixing the copper-clad ceramic substrate, and second through holes corresponding to the positioning holes of the substrate are provided at four corners of the copper-clad ceramic substrate fixing frame, one end of the second through hole of the copper-clad ceramic substrate fixing frame corresponds to the positioning hole of the substrate, and the other end corresponds to the mounting through hole of the first cover plate and the second cover plate, and the positioning column passes through the mounting through holes of the first cover plate and the second cover plate, the second through hole of the copper-clad ceramic substrate fixing frame and the positioning hole of the substrate in sequence to achieve mutual connection and fixation, and the copper-clad ceramic substrate fixing frame is used to facilitate the placement of welding pieces and the copper-clad ceramic substrate on the substrate and to facilitate the plugging of the first cover plate and the second cover plate with the substrate.

[0007] Preferably, the outer surfaces of the first cover plate and the second cover plate are provided with an anti-oxidation layer to improve wear resistance, corrosion resistance and service life.

[0008] Preferably, there are multiple soldering sheets evenly distributed on the substrate.

[0009] The beneficial effects of the utility model are as follows:

[0010] The utility model adopts a split independent structure as a whole, which is flexibly compatible with the layout of various signal terminals and various complex structures of the substrate. While effectively improving production efficiency and reducing welding costs, the simultaneous positioning welding of the head and tail of the signal terminal improves the accuracy of the welding position, and the one-time yield rate of the product is significantly increased. The surface of the welding tool body is anodized or plated with metal materials such as chrome, which greatly improves the anti-deformation ability of the fixture. When a damaged fixture needs to be replaced, it can avoid waiting for a long time to make the fixture. The upper and lower covers or nuts can be replaced according to needs, which reduces the complexity of component replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the power module in the utility model;

[0013] Figure 3 It is a structural schematic diagram of the copper-clad ceramic substrate fixing frame in the utility model;

[0014] Figure 4 It is a schematic diagram of the structure of the utility model after assembly. DETAILED DESCRIPTION

[0015] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0016] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0017] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1-2 As shown, a welding tool for module signal terminals includes a welding tool body 1 for clamping when reflow soldering the signal terminals of a power module, the welding tool body 1 is installed on a substrate 2 of the power module, the welding tool body 1 is composed of a first cover plate 3 and a second cover plate 4 which are arranged in sequence from top to bottom and have the same shape, a plurality of corresponding mounting through holes 5 are respectively arranged on the first cover plate 3 and the second cover plate 4, and metal blocks 6 with the same number as the mounting through holes 5 are respectively installed at the mounting through holes 5 between the first cover plate 3 and the second cover plate 4, the metal blocks 6 are fastened to the positioning columns 10 installed in the positioning holes 9 of the substrate 2 through bolts 7 and washers 8, a plurality of corresponding openings 11 are also arranged on the first cover plate 3 and the second cover plate 4, the positions of the openings 11 correspond to the positions of the signal terminals 12 on the substrate 2, for facilitating the insertion of the signal terminals 12, and positioning the head and tail of the signal terminals 12 by the first cover plate 3 and the second cover plate 4 respectively.

[0018] like Figure 2-3 As shown, a copper-clad ceramic substrate fixing frame 13 is arranged between the substrate 2 and the second cover plate 4, and a first through hole 15 for fixing the copper-clad ceramic substrate 14 is opened on the copper-clad ceramic substrate fixing frame 13, and second through holes 16 corresponding to the positioning holes 9 of the substrate 2 are arranged at the four corners of the copper-clad ceramic substrate fixing frame 13, one end of the second through hole 16 of the copper-clad ceramic substrate fixing frame 13 corresponds to the positioning hole 9 of the substrate 2, and the other end corresponds to the mounting through hole 5 of the first cover plate 3 and the second cover plate 4, and the positioning column 10 sequentially passes through the mounting through hole 5 of the first cover plate 3 and the second cover plate 4, the second through hole 16 of the copper-clad ceramic substrate fixing frame 13 and the positioning hole 9 of the substrate 2 to achieve mutual connection and fixation, and the copper-clad ceramic substrate fixing frame 13 is used to facilitate the placement of the welding piece 17 and the copper-clad ceramic substrate 14 on the substrate 2 and facilitate the plugging between the first cover plate 3 and the second cover plate 4 and the substrate 2.

[0019] The outer surfaces of the first cover plate 3 and the second cover plate 4 are provided with an anti-oxidation layer to improve wear resistance, corrosion resistance and service life. There are multiple welding sheets 17, which are evenly distributed on the substrate 2. The overall structure after installation is shown in FIG. Figure 4 shown.

[0020] It is worth noting that the welding tool of the present invention can be a double-layer structure formed by an upper cover plate and a lower cover plate, or a multi-layer structure, which can be adjusted according to actual conditions; the size of the copper-clad ceramic substrate fixing frame leaves sufficient margin value according to the size of the substrate to prevent abnormal conditions such as missing corners of the copper-clad ceramic substrate during disassembly or after reflow.

[0021] The copper-clad ceramic substrate includes but is not limited to DBC (Direct Bonded Copper), AMB (Active metal brazing), and the like.

[0022] The material used to make the welding tool body must be close to the thermal expansion coefficient of the substrate material, so as to eliminate the different stresses caused by thermal expansion between different materials during reflow, greatly reduce the deformation of the fixture and increase the service life of the fixture, and the surface of the terminal welding tool needs to be anodized or plated with metal materials such as chromium to achieve wear resistance, corrosion resistance, and other purposes such as extending the service life and enhancing the aesthetics. The solder sheet is mainly composed of tin; the signal terminal must be made of a material with excellent conductivity, such as copper, silver, gold, etc., and the surface can be gold-plated, nickel-plated, etc., including but not limited to the above materials. After placement, put the power module and the corresponding fixture into the reflow oven for reflow soldering.

[0023] The signal terminal 12 is inserted into the opening 11 of the signal terminal welding tool body before reflow, and then the module signal terminal welding tool body is plugged onto the substrate 2 of the power module through the substrate positioning column 10.

[0024] When welding the signal terminals, the corresponding solder paste should be applied to the signal terminal welding points on the copper-clad ceramic substrate before the module signal terminal welding tool body and the substrate can be plugged in. After the assembly is completed and checked to be correct, it can be put into the furnace for vacuum reflow soldering.

[0025] The shapes of the openings on the first cover plate and the second cover plate in the welding tool body may be circular, rectangular, diamond, elliptical, triangular, etc., including but not limited to the above shapes, and may be adjusted according to actual conditions without limitation.

[0026] The utility model can design opening shapes, sizes and hole positions suitable for a variety of signal terminals according to actual needs, or design substrate positioning columns suitable for power modules with complex substrate structures, effectively optimize the signal terminal welding process, and be more flexible in dealing with various large-scale automotive-grade power modules during the production process.

[0027] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A welding tool for module signal terminals, comprising a welding tool body (1) for clamping when performing reflow welding on the signal terminals of a power module, wherein the welding tool body (1) is mounted on a substrate (2) of the power module, and is characterized in that: The welding tool body (1) is composed of a first cover plate (3) and a second cover plate (4) which are arranged in sequence from top to bottom and have the same shape. A plurality of corresponding mounting through holes (5) are respectively arranged on the first cover plate (3) and the second cover plate (4). The mounting through holes (5) between the first cover plate (3) and the second cover plate (4) are respectively installed with metal blocks (6) of the same number as the mounting through holes (5). The metal blocks (6) are fastened to positioning columns (10) installed in positioning holes (9) of the substrate (2) through bolts (7) and washers (8). The first cover plate (3) and the second cover plate (4) are also provided with a plurality of corresponding openings (11). The positions of the openings (11) correspond to the positions of signal terminals (12) on the substrate (2) for convenient plugging of the signal terminals (12). The head and tail of the signal terminals (12) are respectively positioned by the first cover plate (3) and the second cover plate (4).

2. The welding tool for module signal terminals according to claim 1, characterized in that: A copper-clad ceramic substrate fixing frame (13) is provided between the substrate (2) and the second cover plate (4); a first through hole (15) for fixing the copper-clad ceramic substrate (14) is provided on the copper-clad ceramic substrate fixing frame (13); and second through holes (16) corresponding to the positioning holes (9) of the substrate (2) are provided at four corners of the copper-clad ceramic substrate fixing frame (13); one end of the second through hole (16) of the copper-clad ceramic substrate fixing frame (13) corresponds to the positioning hole (9) of the substrate (2), and the other end corresponds to the first cover plate (3) and the second through hole (16) of the copper-clad ceramic substrate fixing frame (13). The mounting through holes (5) of the second cover plate (4) correspond to each other, and the positioning posts (10) sequentially penetrate the mounting through holes (5) of the first cover plate (3) and the second cover plate (4), the second through holes (16) of the copper-clad ceramic substrate fixing frame (13), and the positioning holes (9) of the substrate (2) to achieve mutual connection and fixation. The copper-clad ceramic substrate fixing frame (13) is used to facilitate the placement of the welding sheet (17) and the copper-clad ceramic substrate (14) on the substrate (2) and to facilitate the plugging of the first cover plate (3) and the second cover plate (4) with the substrate (2).

3. The welding tool for module signal terminals according to claim 2, characterized in that: The outer surfaces of the first cover plate (3) and the second cover plate (4) are provided with an anti-oxidation layer, which is used to improve wear resistance and corrosion resistance and to increase service life.

4. The welding tool for module signal terminals according to claim 2, characterized in that: There are multiple welding sheets (17) evenly distributed on the substrate (2).

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