Power device module terminal welding tool

Abstract

The utility model discloses a power device module terminal welding tool, and relates to the technical field of semiconductor power device module packaging, the power device module terminal welding tool comprises a clamp unit, the clamp unit comprises a first clamp, a second clamp, a third clamp, a fixing piece and a limiting support assembly, the first clamp, the second clamp and the third clamp are sequentially distributed from bottom to top, and the fixing piece is connected with the second clamp. The power device module terminal is provided with a module bottom plate, an insulating substrate and a module terminal after being welded, the limiting and supporting assembly vertically penetrates through the first clamp, the module bottom plate and the second clamp in sequence from bottom to top, and the module bottom plate is limited between the first clamp and the second clamp through the limiting and supporting assembly; by adopting the power device module terminal welding tool provided by the invention, the product appearance quality can be improved, the coating surface scratch and copper leakage rate of the module terminal can be reduced, the product packaging yield can be improved, and the module terminal can meet the product requirements after being welded.

Description

Technical Field

[0001] The utility model relates to the field of semiconductor power device module packaging technology, in particular to a power device module terminal welding tool. Background Art

[0002] The welding of semiconductor power device modules is mainly divided into welding between the chip and the insulating substrate, welding between the insulating substrate and the module base plate, and welding between the module terminal and the insulating substrate. The welding strength, position and sintering effect of the module terminal between the module terminal and the insulating substrate have a great impact on the product. The terminal structures of power device modules vary. The invention patent with application number 202211463617.8 discloses a welding structure and a power device. The welding tooling in the prior art may cause poor appearance such as module terminal offset, skewness and coating surface damage during the welding process of the control module terminal, and the welding defective rate is high. Therefore, in view of this situation, there is an urgent need to develop a power device module terminal welding tool to meet the needs of actual use. Utility Model Content

[0003] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a power device module terminal welding tool. By adopting the power device module terminal welding tool provided by this application, it can ensure that the product appearance quality is improved, the surface scratches and copper leakage rate of the module terminal plating are reduced, the product packaging yield is improved, and it is ensured that the module terminal meets the product requirements after welding.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A power device module terminal welding tool comprises a fixture unit, which includes a first fixture, a second fixture, a third fixture, a fixing piece and a limit support assembly. The first fixture, the second fixture and the third fixture are distributed in sequence from bottom to top, and the fixing piece is connected to the second fixture. After the welding tool is used to weld the power device module terminal, it has a module base plate, an insulating substrate and a module terminal. The limit support assembly vertically penetrates the first fixture, the module base plate and the second fixture in sequence from bottom to top, and the module base plate is limited between the first fixture and the second fixture by the limit support assembly.

[0006] As a preferred solution: the first clamp is a graphite heat-conducting base plate, the second clamp includes an upper limit plate and a lower limit plate, the third clamp is a pressure block, the fixing part is vertically connected between the upper limit plate and the lower limit plate, the second clamp is detachably arranged above the first clamp, and the third clamp is detachably arranged above the second clamp.

[0007] As a preferred solution: the limit support assembly includes an upper copper column and a lower copper column, the lower copper column is connected between the first clamp and the module base plate, the upper copper column is detachably connected to the lower copper column, and the upper copper column is connected between the upper limit plate and the lower limit plate.

[0008] As a preferred solution: the fixing member includes a stepped stud and a locking nut matching the stepped stud, the stepped stud vertically passes through the upper limit plate and the lower limit plate, and the locking nut is detachably arranged on the upper end of the stepped stud.

[0009] As a preferred solution: the second clamp and the third clamp are both provided with limiting holes for limiting the module terminal, the module terminal vertically passes through the limiting hole, and the single-side reserved gap between the module terminal and the limiting hole is 0.1 mm.

[0010] As a preferred solution: a connecting piece is detachably provided between the second clamp and the third clamp, and the third clamp is arranged above the second clamp through the connecting piece.

[0011] As a preferred solution: both sides of the pressing block are provided with clearance notches for facilitating disassembly, and the fixing piece is located beside the clearance notches.

[0012] Compared with the existing technology, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that by adopting the power device module terminal welding tooling provided by this application, the product appearance quality can be improved, the surface scratches and copper leakage rates of the module terminal plating can be reduced, the product packaging yield can be improved, and the module terminal can be guaranteed to meet the product requirements after welding; by using fixing parts to fix and limit the second clamp, the structural stability is improved; by using limiting support components to support and limit the first clamp, the module base plate, the second clamp and the third clamp, position deviation is prevented and welding accuracy is guaranteed.

[0013] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the power device module terminal welding tooling of the present invention from a first perspective;

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the power device module terminal welding tool from the second perspective of the present invention;

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the power device module terminal welding tooling of the present invention from a third perspective;

[0017] Figure 4This is a schematic diagram of the three-dimensional structure of the power device module terminal after welding of the present invention.

[0018] Description of the accompanying drawings:

[0019] In the figure: 1. Module base plate; 2. Insulating substrate; 3. Module terminal; 4. First clamp; 5. Second clamp; 51. Upper limit plate; 52. Lower limit plate; 6. Upper copper pillar; 7. Third clamp; 71. Clearance gap; 72. Connector; 73. Limit hole; 8. Locking nut; 9. Step stud; 10. Lower copper pillar. DETAILED DESCRIPTION

[0020] The utility model Figures 1 to 4 As shown, a power device module terminal welding tool includes a fixture unit, wherein:

[0021] The clamp unit includes a first clamp 4, a second clamp 5, a third clamp 7, a fixing part and a limiting support assembly. The first clamp 4, the second clamp 5 and the third clamp 7 are distributed in sequence from bottom to top. The fixing part is connected to the second clamp 5. After the welding tool is welded to the power device module terminal, it has a module base plate 1, an insulating substrate 2 and a module terminal 3. The limiting support assembly vertically penetrates the first clamp 4, the module base plate 1 and the second clamp 5 from bottom to top, and the module base plate 1 is limited between the first clamp 4 and the second clamp 5 by the limiting support assembly.

[0022] The power device module terminal is a power device unit; after welding, the power device unit includes a module base plate 1, an insulating substrate 2 and a module terminal 3; the insulating substrate 2 is located on the upper surface of the module base plate 1, and the module terminal 3 is arranged on the insulating substrate 2;

[0023] The module base plate 1 is located above the first clamp 4, and the module terminal 3 vertically passes through the second clamp 5 and the third clamp 7. The fixing part fixes and limits the second clamp 5, and the limiting support assembly supports and limits the first clamp 4, the module base plate 1, the second clamp 5 and the third clamp 7.

[0024] Since the power device module terminal 3 is suitable for different application platforms, there are certain differences between the module terminal 3 structures. The center of gravity of the power device module terminal 3 is eccentric and the height is inconsistent. The packaging process is very likely to cause the terminal to tilt and cold solder joints, resulting in poor matching between the terminal and other raw materials after welding. In view of this abnormal phenomenon after the power device module terminal 3 is welded, the terminal packaging effect is guaranteed by optimizing the design of the welding tool. By adopting the power device module terminal 3 welding tool provided by this application, the product appearance quality can be improved, the scratches on the module terminal 3 plating surface and the copper leakage rate can be reduced, the product packaging yield can be improved, and the module terminal 3 can be guaranteed to meet the product requirements after welding.

[0025] The first clamp 4 is a graphite heat-conducting base plate, the second clamp 5 includes an upper limit plate 51 and a lower limit plate 52, the third clamp 7 is a pressure block, and the fixing part is vertically connected between the upper limit plate 51 and the lower limit plate 52. The second clamp 5 is detachably arranged above the first clamp 4, and the third clamp 7 is detachably arranged above the second clamp 5.

[0026] This graphite thermally conductive baseplate is used for heat transfer between the heating platform and the sintering furnace equipment, as well as for positioning the module baseplate 1. Made of graphite, it is highly resistant to high temperatures, with a melting point of 3850±50°C. Even under ultra-high-temperature arc burns, it exhibits minimal weight loss and a low thermal expansion coefficient. It also exhibits thermal conductivity, which decreases with increasing temperature, and possesses excellent lubricity, chemical stability, plasticity, and thermal shock resistance.

[0027] The upper limit plate 51 and the lower limit plate 52 are used to limit the position of the power device module terminal 3 during the welding process. The upper limit plate 51 and the lower limit plate 52 are both made of aluminum alloy 7075, which has good wear resistance and weldability.

[0028] The stainless steel clamp is used to maintain the upright feature of the power device module terminal 3 during the packaging process. The stainless steel clamp is made of 304, which has a certain weight and good weldability and heat resistance.

[0029] The limiting support assembly includes an upper copper column 6 and a lower copper column 10. The lower copper column 10 is connected between the first clamp 4 and the module base plate 1. The upper copper column 6 is detachably connected to the lower copper column 10. The upper copper column 6 is connected between the upper limiting plate 51 and the lower limiting plate 52.

[0030] The fixing member includes a stepped stud 9 and a locking nut 8 matching the stepped stud 9 . The stepped stud 9 vertically passes between the upper limit plate 51 and the lower limit plate 52 . The locking nut 8 is detachably arranged on the upper end of the stepped stud 9 .

[0031] The stepped stud 9 integrates the upper limit plate 51 and the lower limit plate 52 into one piece, making them easy to take.

[0032] The upper copper pillar 6 has a blind hole therein and cooperates with the lower copper pillar 10 to position and support the module base plate 1 and the second fixture 5 .

[0033] The locking nut 8 and the stepped stud 9 cooperate with each other to lock the upper limit plate 51 and the lower limit plate 52 to fix the upper limit plate 51 and the lower limit plate 52.

[0034] The lower copper column 10 is screwed onto the graphite heat-conducting base plate to limit the graphite heat-conducting base plate and the module base plate 1 .

[0035] The stepped stud 9 is used for positioning and connecting the upper limit plate 51 and the lower limit plate 52 ; the locking nut 8 is used for fixing the upper limit plate 51 and the lower limit plate 52 .

[0036] The upper copper column 6 is used for positioning and supporting the power device unit and the second fixture 5, as well as for positioning the module base plate 1 and the graphite thermal conductive base plate; the lower copper column 10 is used for positioning the graphite thermal conductive base plate and the module base plate 1; by adopting a limiting support component to achieve support and position limitation between the power device unit and the fixture unit, welding accuracy is guaranteed and position deviation is prevented.

[0037] The second clamp 5 and the third clamp 7 are both provided with a limiting hole 73 for limiting the module terminal 3 . The module terminal 3 vertically passes through the limiting hole 73 . The single-side reserved gap between the module terminal 3 and the limiting hole 73 is 0.1 mm.

[0038] The second fixture 5 secures the upper and lower retaining plates 51 and 52 via stepped studs 9 and locknuts 8. Before soldering the base of the module terminal 3, the second fixture 5 is flipped over. After inserting the module terminal 3 into the corresponding retaining hole 73, solder paste is applied. After soldering the module terminal 3, the soldering fixture for the module terminal 3 is reversed and placed in contact with the module base plate 1 and the insulating substrate 2. A 0.1mm clearance is reserved on either side of the retaining hole 73 of the second fixture 5 to prevent significant offset during the packaging process.

[0039] The clamping block has a 0.1mm clearance on one side between the module terminal 3 and the retaining hole 73 of the clamping block, ensuring no significant offset during the packaging process of the module terminal 3. After the module terminal 3 contacts the insulating substrate 2, the clamping block presses against the base of the terminal, uprighting the module terminal 3 and ensuring a clear gap between the module terminal 3 and the retaining hole 73 of the clamping block.

[0040] A connecting piece 72 is detachably provided between the second clamp 5 and the third clamp 7 , and the third clamp 7 is provided above the second clamp 5 via the connecting piece 72 .

[0041] Both sides of the pressing block are provided with clearance notches 71 for easy disassembly, and the fixing piece is located beside the clearance notches 71 .

[0042] By using the second clamp 5 and the third clamp 7 in conjunction with each other, the module terminal 3 is inserted upside down after the solder paste is applied to the root, so that the module terminal 3 remains upright after welding and does not have cold solder joints or other phenomena; and after the module terminal 3 is welded, the clamp units are easy to disassemble and the module terminal 3 is not easily scratched or other phenomena.

[0043] The usage and principle of the power device module terminal welding tool are as follows:

[0044] The module base plate is located above the first clamp, and the module terminal vertically passes through the second clamp and the third clamp. The fixing part fixes and limits the second clamp, and the limiting support assembly supports and limits the first clamp, the module base plate, the second clamp and the third clamp; through the coordinated use of the second clamp and the third clamp, the module terminal adopts the method of inverted insertion after the root is soldered with solder paste, so that the module terminal remains upright after welding, and there will be no phenomenon such as cold welding; and after the module terminal is welded, the clamp units are easy to disassemble, and the module terminal is not prone to scratches and the like.

[0045] The design focus of the present utility model is that by adopting the power device module terminal welding tooling provided in this application, the product appearance quality can be improved, the surface scratches and copper leakage rate of the module terminal plating can be reduced, the product packaging yield can be improved, and the module terminal can be guaranteed to meet the product requirements after welding; by using fixing parts to fix and limit the second clamp, the structural stability is improved; by using limiting support components to support and limit the first clamp, the module base plate, the second clamp and the third clamp, position deviation is prevented and welding accuracy is guaranteed.

[0046] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A power device module terminal welding tool, characterized in that: The invention comprises a clamp unit, which comprises a first clamp, a second clamp, a third clamp, a fixing part and a limiting support assembly. The first clamp, the second clamp and the third clamp are arranged in sequence from bottom to top, and the fixing part is connected to the second clamp. After the welding tool is welded to the power device module terminal, it has a module base plate, an insulating substrate and a module terminal. The limiting support assembly vertically penetrates the first clamp, the module base plate and the second clamp in sequence from bottom to top, and the module base plate is limited between the first clamp and the second clamp by the limiting support assembly.

2. The power device module terminal welding tool according to claim 1, characterized in that: The first clamp is a graphite heat-conducting base plate, the second clamp includes an upper limit plate and a lower limit plate, the third clamp is a pressure block, the fixing part is vertically connected between the upper limit plate and the lower limit plate, the second clamp is detachably arranged above the first clamp, and the third clamp is detachably arranged above the second clamp.

3. The power device module terminal welding tool according to claim 2, characterized in that: The limit support assembly includes an upper copper column and a lower copper column, the lower copper column is connected between the first fixture and the module bottom plate, the upper copper column is detachably connected to the lower copper column, and the upper copper column is connected between the upper limit plate and the lower limit plate.

4. The power device module terminal welding tool according to claim 2, characterized in that: The fixing member comprises a stepped stud and a locking nut matched with the stepped stud. The stepped stud vertically penetrates between the upper limit plate and the lower limit plate. The locking nut is detachably arranged on the upper end of the stepped stud.

5. The power device module terminal welding tool according to claim 1, characterized in that: The second clamp and the third clamp are both provided with limiting holes for limiting the module terminal. The module terminal vertically passes through the limiting hole, and a single-side reserved gap between the module terminal and the limiting hole is 0.1 mm.

6. The power device module terminal welding tool according to claim 1, characterized in that: A connecting piece is detachably provided between the second clamp and the third clamp, and the third clamp is arranged above the second clamp through the connecting piece.

7. The power device module terminal welding tool according to claim 2, characterized in that: Both sides of the pressing block are provided with clearance notches for easy disassembly, and the fixing piece is located beside the clearance notches.

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