IGBT (Insulated Gate Bipolar Translator) module soldering lug jig

Abstract

The utility model aims to provide an IGBT (Insulated Gate Bipolar Translator) module soldering lug jig, which is used for meeting the requirement of welding a first product part, a second product part, a chip and the like of an IGBT module at one time, and comprises a base, a positioning bolt, a first positioning frame and a second positioning frame which are stacked in sequence, wherein the base is provided with a positioning hole for assembling a positioning bolt, the first positioning frame is provided with a positioning hole matched with the base, and a through accommodating part is arranged in the first positioning frame; the second positioning frame is arranged in the containing part, the shape of the second positioning frame is matched with that of the containing part, a plurality of chip grooves are formed in the second positioning frame and used for containing chips to be welded, one-time preassembly of all assemblies is achieved by stacking the parts in sequence, and finally the whole jig is placed in vacuum welding equipment. Therefore, one-time welding of the IGBT module can be completed. The problems of low working efficiency and low welding precision caused by repeated welding are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of IGBT, in particular to an IGBT module welding piece fixture. Background Art

[0002] The IGBT module packaging field belongs to the microelectronics industry, in which IGBT is a composite power device with voltage-type control, large input impedance, low driving power, simple control circuit, small switching loss, fast on-off speed, high operating frequency, large component capacity, etc. An IGBT product includes an insulated copper-clad laminate (DBC), an IGBT chip, a freewheeling diode, and ultra-pure aluminum wires. Through the layout design of the DBC and the unique performance of the chip, it is connected together through reflow sintering and aluminum wire bonding, supplemented by a protective shell (fixed to the DBC) and filled with silicone, and finally forms a complete IGBT module.

[0003] In the IGBT manufacturing process, high-power IGBT modules need to solder the chip to the DBC through reflow sintering, and the DBC is soldered to the base plate. Therefore, when selecting solder tabs for solder, a jig is needed to fix the chip on the DBC according to the specified arrangement, and the DBC is soldered to the base plate. The current solder tab process is to first solder the DBC and the chip separately, and then solder the semi-finished product to the copper base plate to achieve the positioning function. This positioning structure is cumbersome and inconvenient, and there are problems with low efficiency and low precision of the welding jig. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an IGBT module welding piece fixture; used to meet the needs of welding the first product components, second product components, chips, etc. of the IGBT module at one time, characterized in that it includes:

[0005] A base, a positioning bolt, a first positioning frame and a second positioning frame are stacked in sequence; wherein the base is provided with a positioning hole for assembling the positioning bolt, the first positioning frame is provided with a positioning hole matching the base, and the first positioning frame is provided with a through accommodating portion; the second positioning frame is arranged in the accommodating portion, and its shape matches that of the accommodating portion, and the second positioning frame is provided with a plurality of chip slots for accommodating chips to be welded.

[0006] The layered positioning between different components of the IGBT module is completed by multiple stacked positioning frames, and the connection between each layer is ensured according to the accommodating part and chip slot of each positioning frame; all components are pre-assembled at one time by sequentially stacking the components, and finally the whole jig is placed in the vacuum welding equipment to complete the one-time welding of the IGBT module. The problem of low work efficiency and low welding precision caused by multiple welding is solved.

[0007] Furthermore, the first product component is installed between the base and the first positioning frame, and the first product component is provided with a positioning hole corresponding to the base; the second product component is arranged in the accommodating portion, and its shape matches the accommodating portion; the chip is arranged in the corresponding accommodating portion; welding pieces are provided between the first product component and the second product component, and between the second product component and the chip.

[0008] Furthermore, each chip slot of the second positioning frame is provided with an exhaust hole. A large amount of gas will be generated during the vacuum welding process. In order to prevent the generation of voids in the welding layer, a through hole is provided on the chip slot to assist in exhausting the gas.

[0009] Furthermore, the second positioning frame is provided with a plurality of positioning bosses on one side close to the base. The plurality of positioning bosses are provided to limit the second product components within the range of the bosses, thereby limiting the second product components and ensuring the installation accuracy.

[0010] Furthermore, the inner wall of the accommodating portion is provided with a plurality of positioning protrusions.

[0011] Furthermore, the height of the positioning protrusion close to the base side exceeds the plane where the edge of the first positioning frame close to the base side is located.

[0012] Furthermore, the second positioning frame is made of graphite to avoid the second positioning frame from reacting with the components and chips of the IGBT module under vacuum welding conditions.

[0013] Furthermore, the first positioning frame is made of aluminum alloy.

[0014] This utility model provides a welding fixture for welding pads. It solves the problem that the positioning structure of the traditional welding fixture needs to be welded multiple times, avoiding the problem of high product failure rate and low operation efficiency due to excessive human contact, human body static electricity and other factors that may exist in multiple operations; this fixture realizes one-time welding of IGBT modules, greatly reducing the operation time and product failure rate, and multiple positioning holes are set around the chip slot of the second positioning frame to avoid welding layer voids caused by excessive gas generated in one welding, and the positioning boss on the side of the second positioning frame close to the base limits the second product parts, while ensuring efficiency, and further ensuring the accuracy of welding.

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of an exemplary IGBT module soldering fixture;

[0017] Figure 2An exploded view of an exemplary IGBT module soldering fixture after loading the product;

[0018] Figure 3 is a structural schematic diagram of a first positioning frame;

[0019] Figure 4 is a front view of the first positioning frame;

[0020] Figure 5 is a structural schematic diagram of a second positioning frame;

[0021] Figure 6 This is a bottom view of the second positioning frame.

[0022] 10: base; 20: positioning bolt; 30: first positioning frame; 301: accommodating portion; 302: positioning protrusion; 40: second positioning frame; 401: chip slot; 401.1: exhaust hole; 402: positioning boss; 50: first product component; 60: second product component; 70: chip.

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. DETAILED DESCRIPTION

[0024] See also Figure 1 , Figure 1 An exploded view of an exemplary IGBT module soldering fixture;

[0025] The welding sheet fixture includes a base 10, a positioning bolt 20, a first positioning frame 30 and a second positioning frame 40 stacked in sequence, wherein the base 10 is provided with a positioning hole for assembling the positioning bolt 20, the first positioning frame 30 is provided with a positioning hole matching the base 10, and the first positioning frame 30 is provided with a through accommodating portion 301; the second positioning frame 401 is arranged in the accommodating portion 301, and its shape matches the accommodating portion 301, and the second positioning frame is provided with a plurality of chip slots 401 for accommodating soldered chips.

[0026] See also Figure 2 , Figure 2FIG. 1 is a schematic diagram of an exemplary IGBT module welding piece fixture after loading the product. In the present utility model, the positioning bolt 20 is first installed on the positioning hole of the base 10, and then the first product component 50 for IGBT assembly is fixed to the base 10 through the positioning bolt 20; then the first positioning frame 30 is installed on the first product component 50 through the positioning bolt 20, and the first product component 50 is fixed between the base plate 10 and the first positioning frame 30; then the welding piece is placed in the accommodating portion 4 of the first positioning frame, and then the second product component 60 is covered on the welding piece. The shape matches the shape of the accommodating portion, so the second product component 60 is positioned in the accommodating portion 301, and then the second positioning frame 40 is installed in the accommodating portion 301 to complete the assembly of the jig. Subsequently, the welding pieces for welding the chips are placed in the corresponding chip slots 401 in sequence, and then the chips 70 to be welded are placed on the welding pieces in sequence. At this time, the chip 70 is also installed in the corresponding chip slot 401. At this point, all the assembly work is completed, and the assembled jig can be placed in the equipment for welding operations; after the operation is completed, the first positioning frame 30 and the second positioning frame 40 are taken out at once to obtain the welded IGBT module. Preferably, in the utility model, the first positioning frame is made of aluminum alloy. The second positioning frame is made of graphite to avoid reaction with the components and chips of the IGBT module under vacuum welding conditions.

[0027] In the utility model, multiple stacked positioning frames are used to complete the layered positioning between different components of the IGBT module, and then the interconnection between the layers is ensured according to the accommodating parts or chip slots that penetrate each positioning frame; the one-time pre-assembly of all components is realized by sequentially stacking the components, and finally the entire jig is placed in the vacuum welding equipment to complete the one-time welding of the IGBT module. The problem of low work efficiency and low welding precision caused by multiple welding is solved.

[0028] See also Figure 3 In another embodiment, the inner wall of the receiving portion is provided with a plurality of positioning protrusions 302, and the outer wall of the second positioning frame is provided with a plurality of positioning concave points matching the positioning protrusions 302. Figure 4 Preferably, the height of the positioning protrusion close to the side of the base exceeds the plane where the edge of the first positioning frame close to the side of the base is located.

[0029] Due to the high welding accuracy requirements, a relatively fixed connection between the first positioning frame 30 and the second positioning frame is required. However, threaded fixation will reduce the installation efficiency of the fixture. Therefore, positioning bumps are set on the inner wall of the accommodating portion, and the longitudinal fixed connection is maintained by sliding fixation of a partial area. It is convenient to take and place the second positioning frame 40, and at the same time plays the role of positioning the second positioning frame 40, which significantly improves efficiency in actual production operations. The height of the positioning bump separates the first product component from the first positioning frame to avoid the first positioning frame and the first product component from reacting during welding.

[0030] See also Figure 5 In another embodiment, each chip slot 401 of the second positioning frame 40 is surrounded by exhaust holes 401.1. A large amount of gas will be generated during the vacuum welding process. In order to prevent the formation of voids in the welding layer, through holes are set on the chip slot to assist in exhausting the gas.

[0031] See also Figure 6 In another preferred embodiment, a plurality of positioning bosses 402 are further provided on one side of the second positioning frame close to the base 10. During the vacuum welding process, the generated gas will be discharged, and the discharged gas will exert force on some product parts or chips, causing their positions to shift and thus affecting the welding accuracy. Therefore, a plurality of positioning bosses are provided to limit the second product parts 60 within the range of the bosses, thereby limiting the second product parts 60 and ensuring the installation accuracy.

[0032] This utility model provides a welding fixture for welding pieces. It solves the problem that the positioning structure of the traditional welding fixture needs to be welded multiple times, avoiding the problem of high product failure rate and low operation efficiency due to excessive human contact, human body static electricity and other factors that may exist in multiple operations; this fixture realizes one-time welding of IGBT modules, greatly reducing the operation time and product failure rate, and multiple positioning holes are set around the chip slot of the second positioning frame to avoid welding layer voids caused by excessive gas generated in one welding, and the second positioning frame 40 is close to the base 10. The positioning boss on the side limits the second product component 60, while ensuring efficiency, and further ensuring the accuracy of welding.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. An IGBT module welding fixture, used to meet the needs of welding the first product component, the second product component, and the chip of the IGBT module at one time, characterized in that: include: A base, a positioning bolt, a first positioning frame and a second positioning frame are stacked in sequence; wherein the base is provided with a positioning hole for assembling the positioning bolt, the first positioning frame is provided with a positioning hole matching the base, and the first positioning frame is provided with a through accommodating portion; the second positioning frame is arranged in the accommodating portion, and its shape matches that of the accommodating portion, and the second positioning frame is provided with a plurality of chip slots for accommodating chips to be welded.

2. The IGBT module soldering fixture according to claim 1, characterized in that: The first product component is installed between the base and the first positioning frame, and a positioning hole corresponding to the base is provided on the first product component; the second product component is arranged in the accommodating portion, and its shape matches the accommodating portion; the chip is arranged in the corresponding accommodating portion; welding pieces are provided between the first product component and the second product component, and between the second product component and the chip.

3. The IGBT module soldering fixture according to claim 2, characterized in that: Each chip slot of the second positioning frame is provided with an exhaust hole.

4. The IGBT module soldering fixture according to claim 3, characterized in that: A plurality of locking bosses are disposed on one side of the second positioning frame close to the base.

5. The IGBT module soldering fixture according to claim 4, characterized in that: The inner wall of the accommodating portion is provided with a plurality of positioning protrusions.

6. The IGBT module soldering fixture according to claim 5, characterized in that: The height of the positioning protrusion close to one side of the base exceeds the plane where the edge of the first positioning frame close to one side of the base is located.

7. The IGBT module soldering fixture according to any one of claims 1 to 6, characterized in that: The second positioning frame is made of graphite.

8. The IGBT module soldering fixture according to claim 7, characterized in that: The first positioning frame is made of aluminum alloy.

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