IGBT (Insulated Gate Bipolar Translator) module welding fixture and welding process thereof

Abstract

The invention discloses an IGBT module welding clamp and a welding process thereof, and relates to the technical field of IGBT module machining, the IGBT module welding clamp comprises a welding table, a reserved bin, an IGBT module assembly and a limiting clamping plate, and the limiting clamping plate is provided with a plurality of sets of reserved holes. The limiting clamping plate is arranged and inversely arranged at the upper end of the welding table, the multiple sets of PINs are inserted into the preformed holes formed in the limiting clamping plate respectively, then the DBCs are inserted into the multiple sets of preformed holes respectively, one ends of the multiple sets of PINs are subjected to hot welding to the interiors of the multiple sets of preformed holes, and then the limiting clamping plate and the IGBT module assembly are subjected to hot welding connection, so that the connection strength of the PINs is improved; even in a high-temperature environment, the limiting clamping plates carry out auxiliary limiting on the PINs, the loosening risk caused by melting is effectively resisted, the limiting clamping plates serve as middle layers, heat conducted by the PINs is dispersed, the temperature peak value of a welding spot area is reduced, the possibility of secondary melting is reduced, and the heat stability of welding spots is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of IGBT module processing technology, specifically to an IGBT module welding fixture and its welding process. Background Technology

[0002] IGBT modules, or Insulated Gate Bipolar Transistor modules, are core devices in the field of high-power power electronics. They combine the advantages of MOSFETs (easy to drive and low loss) with bipolar transistors (high current and high voltage withstand). As key components for power conversion and control, they integrate conductivity, insulation, and heat dissipation. These modules feature high voltage withstand ratings, low conduction losses, excellent switching characteristics, and strong thermal stability. Core indicators such as welding quality, bond strength, and thermal resistance directly determine their reliability and lifespan. IGBT modules are widely used in new energy vehicles, photovoltaic and wind power, industrial frequency converters, rail transit traction systems, and flexible power grid transmission devices, serving as a core foundational component supporting the efficient and stable operation of modern high-power power electronic equipment.

[0003] IGBT module soldering is a core and critical process in its packaging and manufacturing, directly determining the module's electrical performance, heat dissipation capacity, and long-term reliability. Currently, the mainstream method is vacuum reflow soldering, which uses solder pads to achieve a firm interconnection between the IGBT chip, DBC ceramic substrate, and copper substrate under high temperature, vacuum, and controllable pressure conditions. This effectively avoids cold solder joints, warping, and delamination. The soldering process requires precise control of temperature profiles, pressure, and vacuum levels to adapt to the thermal expansion characteristics of different materials and reduce thermal stress damage. Power terminals are mostly connected using laser welding or resistance welding. High-quality soldering ensures stable electrical conductivity and heat dissipation pathways, significantly improving the module's power cycle life. This is the core guarantee for achieving high reliability and long lifespan applications for IGBT modules.

[0004] In existing technologies, solder paste is mostly used as the interconnect material for IGBT module soldering. However, the melting condition of solder paste is 240°C. If the actual production or application temperature of the IGBT module exceeds 240°C, the high temperature is conducted to the pins through the PIN pins (95% copper material), causing the solder to melt again. This reduces the strength of the originally solidified solder joint and directly causes the PIN pins to loosen. After the PIN pins loosen, the contact area between the pins and the DBC substrate decreases and the contact frequency increases. Under high voltage and high frequency conditions, this poor contact will produce a tip discharge phenomenon. When the power supply voltage is superimposed, the chip is subjected to a high voltage far exceeding its withstand voltage avalanche limit, which eventually leads to chip overvoltage breakdown and dynamic avalanche failure. When facing the external high temperature environment, the IGBT module lacks sufficient thermal stability and resistance to secondary melting. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an IGBT module welding fixture and its welding process to solve the technical problems mentioned above in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an IGBT module welding fixture, comprising a welding table, a reserved compartment, an IGBT module assembly, and a limiting clamping plate, wherein the welding table has a reserved compartment at its upper end, the reserved compartment is movably mounted on the upper end of the reserved compartment, and an IGBT module assembly is movably mounted on one end of the welding table, and the IGBT module assembly is movably connected to the limiting clamping plate. The limiting clamp has multiple sets of reserved holes, and PIN pins and DBCs are movably installed inside the multiple sets of reserved holes. The upper end of the welding platform is equipped with a first electric heating module and a third electric heating module, and the first electric heating module and the third electric heating module are movably connected to the IGBT module assembly. The reserved compartment is movably installed with two sets of second electric heating modules, and both sets of second electric heating modules are movably connected to the limiting clamp. Two sets of transfer clamps are movably installed on the upper end of the welding platform. Both sets of transfer clamps are provided with locking grooves, and the inner walls of both sets of locking grooves are movably connected to the outer wall of the IGBT module assembly. The welding platform is equipped with multiple sets of guide columns, the IGBT module assembly has multiple sets of reserved holes, and the inner walls of the multiple sets of reserved holes are movably connected to the outer walls of the multiple sets of guide columns. The welding platform is symmetrically equipped with guide rods, and two sets of guide rods are located at the upper end of the reserved compartment.

[0007] By adopting the above technical solution, the problem of PIN loosening when the actual production or application scenario of IGBT module is too high is solved. The limiting clamp is inverted on the upper part of the welding platform, and multiple sets of PIN pins are inserted into the reserved holes opened in the limiting clamp. Then, DBCs are inserted into the multiple sets of reserved holes. One end of the multiple sets of PIN pins is heat-welded to the multiple sets of reserved holes. Then, the limiting clamp is heat-welded to the IGBT module assembly, which improves the connection strength of the PIN pins. Even in high temperature environment, the limiting clamp provides auxiliary limiting for the PIN, effectively resisting the risk of loosening caused by melting. As an intermediate layer, the limiting clamp disperses the heat conducted by the PIN pins, reduces the temperature peak of the solder joint area, reduces the possibility of secondary melting, and significantly improves the thermal stability of the solder joint.

[0008] The invention is further configured such that: multiple sets of first hydraulic pumps are installed inside the welding station; each set of first hydraulic pumps has a first hydraulic column installed at its output end; two sets of first hydraulic columns have a first limiting plate installed at one end; two other sets of first hydraulic columns have a second limiting plate installed at one end; and the remaining two sets of first hydraulic columns have a third limiting plate installed at one end. A second hydraulic pump is installed inside the reserved compartment; a second hydraulic column is installed at the output end of the second hydraulic pump; a connecting plate is installed at one end of the second hydraulic column; and both ends of the connecting plate are respectively connected to two sets of second electric heating modules.

[0009] Preferably, multiple sets of first hydraulic pumps are started, driving multiple sets of first hydraulic columns to move, thereby driving the first limiting plate, the second limiting plate and the third limiting plate to move. The second hydraulic pump is started, driving the second hydraulic columns to move, thereby driving the connecting plate to move, and then driving the two sets of second electric heating modules to move.

[0010] The invention is further configured such that two sets of drive motors are installed inside the welding station, and each set of drive motors has a transfer shaft installed at its output end, and one end of each set of transfer shafts is connected to one end of each set of transfer clamps.

[0011] Preferably, two sets of drive motors are started, driving two sets of transfer shafts to rotate, thereby causing two sets of transfer clamps to flip.

[0012] The present invention is further configured such that a first micro motor and a second micro motor are installed inside the two sets of transfer clamps, a first drive shaft is installed at the output end of the two sets of first micro motors, a first drive gear is installed at one end of the two sets of first drive shafts, a second drive shaft is installed at the output end of the two sets of second micro motors, and a second drive gear is installed at one end of the two sets of second drive shafts.

[0013] Preferably, the first micro motor and the second micro motor are started, respectively driving the first drive shaft and the second drive shaft to rotate, thereby driving the first drive gear and the second drive gear to rotate.

[0014] The present invention is further configured such that a first transmission shaft is movably installed inside each of the two sets of transfer clamps, a first transmission gear is installed at one end of each of the two sets of first transmission shafts, and the two sets of first transmission gears are respectively meshed with two sets of first drive gears. A first connecting shaft is symmetrically installed inside each of the two sets of transfer clamps, and multiple sets of first connecting shafts are respectively connected to the two sets of first drive shafts and the two sets of first transmission shafts by a toothed synchronous belt.

[0015] Preferably, the first drive gear rotates and meshes with the first transmission gear. The first transmission gear rotates, thereby driving the first transmission shaft to rotate. The rotation direction of the first drive shaft is opposite to that of the first transmission shaft. The first drive shaft and the first transmission shaft are respectively connected to two sets of first connecting shafts through toothed synchronous belts, so the two sets of first connecting shafts rotate.

[0016] The present invention is further configured such that a first connecting bevel gear is installed at one end of each of the multiple sets of first connecting shafts, a first limiting shaft is symmetrically mounted on the outer wall of each of the two sets of transfer clamps, a first limiting bevel gear is installed at one end of each of the multiple sets of first limiting shafts extending into the interior of the two sets of transfer clamps, and the multiple sets of first limiting bevel gears are respectively meshed with the multiple sets of first connecting bevel gears, and a first baffle can be installed on the outer wall of each of the multiple sets of first limiting shafts.

[0017] Preferably, the two sets of first connecting shafts rotate, thereby driving the two sets of first connecting bevel gears to rotate. The two sets of first connecting bevel gears are respectively meshed with the two sets of first limiting bevel gears. Therefore, the two sets of first limiting bevel gears rotate, thereby driving the two sets of first limiting shafts to rotate, and then driving the two sets of first baffles to rotate around the two sets of first limiting shafts.

[0018] The present invention is further configured such that a second transmission shaft is movably installed inside each of the two sets of transfer clamps, a second transmission gear is installed at one end of each of the two sets of second transmission shafts, and the two sets of second transmission gears are respectively meshed with two sets of second drive gears. A second connecting shaft is symmetrically installed inside each of the two sets of transfer clamps, and multiple sets of second connecting shafts are respectively connected to the two sets of second drive shafts and the two sets of second transmission shafts by a toothed synchronous belt.

[0019] Preferably, the second drive gear rotates and meshes with the second transmission gear. The second transmission gear rotates, thereby driving the second transmission shaft to rotate. The rotation direction of the second drive shaft is opposite to that of the second transmission shaft. The second drive shaft and the second transmission shaft are respectively connected to two sets of second connecting shafts through toothed synchronous belts, so the two sets of second connecting shafts rotate.

[0020] The present invention is further configured such that a second linkage bevel gear is installed at one end of each of the multiple sets of second linkage shafts, a second limiting shaft is symmetrically mounted on the outer wall of each of the two sets of transfer clamps, the multiple sets of second limiting shafts extend into the interior of the two sets of transfer clamps and a second limiting bevel gear is installed at both ends, and the multiple sets of second limiting bevel gears are respectively meshed with the multiple sets of second linkage bevel gears, and a second baffle can be installed on the outer wall of each of the multiple sets of second limiting shafts.

[0021] Preferably, the two sets of second linkage shafts rotate, thereby driving the two sets of second linkage bevel gears to rotate. The two sets of second linkage bevel gears are respectively meshed with the two sets of second limiting bevel gears. Therefore, the two sets of second limiting bevel gears rotate, thereby driving the two sets of second limiting shafts to rotate, and then driving the two sets of second baffles to rotate around the two sets of second limiting shafts as the center.

[0022] The invention is further configured such that an air purification device is installed inside the welding table, and multiple sets of air suction plates are installed on the upper part of the welding table, and each set of air suction plates is connected to the air purification device by an air suction pipe.

[0023] Preferably, when the air purification device is activated, multiple sets of suction plates generate suction to absorb the harmful gases produced by the hot welding operation, and the harmful gases are transported to the air purification device through multiple sets of suction pipes. The air purification device then treats the harmful gases before discharging them.

[0024] An IGBT module welding fixture and its welding process include the following steps: S1: Preliminary welding of IGBT module assembly: The IGBT module assembly is placed on the top of the first electric heating module for preliminary welding; S2: Preliminary welding of the limiting clamp and the PIN: The limiting clamp is inverted on the upper end of the reserved compartment, the PIN is inserted into the reserved holes of multiple sets of the limiting clamp, and the second electric heating module welds the limiting clamp and the PIN. S3: Preliminary welding of IGBT module assembly and limiting clamp: The transfer clamp drives the IGBT module assembly to move, so that the IGBT module assembly and the limiting clamp are in contact. The second electric heating module welds the limiting clamp and the IGBT module assembly. S4: Final welding of IGBT module assembly: The transfer clamp moves the IGBT module assembly, causing it to fall onto the upper part of the third electric heating module, where the third electric heating module performs the final heat welding on the IGBT module assembly.

[0025] In summary, the present invention has the following main beneficial effects: 1. This invention solves the problem of PIN loosening when the temperature is too high in the actual production or application scenarios of IGBT modules by setting a limiting clamp. The limiting clamp is inverted on the upper part of the welding platform, and multiple sets of PINs are inserted into the reserved holes opened in the limiting clamp. Then, DBCs are inserted into the multiple sets of reserved holes. One end of the multiple sets of PINs is heat-welded to the multiple sets of reserved holes. Then, the limiting clamp is heat-welded to the IGBT module assembly, which improves the connection strength of the PINs. Even in high temperature environments, the limiting clamp provides auxiliary limiting for the PINs, effectively resisting the risk of loosening caused by melting. As an intermediate layer, the limiting clamp disperses the heat conducted by the PINs, reduces the temperature peak of the solder joint area, reduces the possibility of secondary melting, and significantly improves the thermal stability of the solder joint.

[0026] 2. This invention employs a step-by-step heating method, comprising a first electric heating module, a second electric heating module, and a third electric heating module, which perform preliminary hot welding, pre-welding, and final hot welding. This avoids severe thermal shock to the IGBT chip and DBC ceramic substrate caused by a single high temperature, reduces internal stress caused by the thermal expansion difference of different materials, prevents substrate warping and chip micro-cracks, and significantly improves the structural stability and reliability of the module.

[0027] 3. This invention, by incorporating a transfer clamping plate, a locking groove, a first baffle, and a second baffle, and with the locking groove working in conjunction with the automatically flipping first and second baffles, enables rapid opening, clamping, closing, limiting, and unloading of IGBT module components. The entire process eliminates the need for manual clamping and positioning. The transfer clamping plate facilitates automatic transfer of the module between different welding stations. Compared to existing robotic arms, this invention offers lower costs. The transfer clamping plate stably flips the IGBT module component to an inverted state, precisely engaging with the limiting clamping plate. The locking groove and baffles provide sufficient clamping force without damaging the module surface or pins, perfectly adapting to the inverted pre-assembly and front-side welding process. The first and second baffles use a flipping opening and closing, surface contact limiting method to clamp the IGBT module, rather than rigid clamping, effectively preventing scratches, deformation, and cracking of delicate and fragile components such as chips, DBC substrates, and PIN pins during clamping and transfer, significantly improving product yield. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the welding station in this invention; Figure 2 This is a schematic diagram of the first electric heating module, the second electric heating module, and the third electric heating module in this invention; Figure 3 This is a schematic diagram of the internal structure of the welding station in this invention; Figure 4 This is a schematic diagram of the connecting plate in the present invention; Figure 5 This is a schematic diagram of the transfer clamp in the present invention; Figure 6 This is a schematic diagram of the internal structure of the transfer clamp in this invention; Figure 7 for Figure 6 Enlarged view of point A in the image; Figure 8 for Figure 6 Enlarged view of point B in the image; Figure 9 This is a schematic diagram of the suction tube in this invention; Figure 10 This is an exploded view of the IGBT module component in this invention.

[0029] Explanation of reference numerals in the attached figures: 1. Welding table; 2. First electric heating module; 3. Reserved compartment; 4. Guide rod; 5. Second electric heating module; 6. Third electric heating module; 7. First hydraulic pump; 8. First hydraulic column; 9. First limiting plate; 10. Second limiting plate; 11. Third limiting plate; 12. Second hydraulic pump; 13. Second hydraulic column; 14. Connecting plate; 15. Drive motor; 16. Transfer shaft; 17. Transfer clamp; 18. Engaging groove; 19. First micro motor; 20. First drive shaft; 21. First drive gear; 22. First transmission shaft; 23. First transmission gear; 2 4. Second micro motor; 25. Second drive shaft; 26. Second drive gear; 27. Second transmission shaft; 28. Second transmission gear; 29. ​​First connecting shaft; 30. First connecting bevel gear; 31. First limiting shaft; 32. First limiting bevel gear; 33. First baffle; 34. Second connecting shaft; 35. Second connecting bevel gear; 36. Second limiting shaft; 37. Second limiting bevel gear; 38. Second baffle; 39. Air purification device; 40. Intake pipe; 41. Intake plate; 42. IGBT module assembly; 43. Limiting clamp; 44. Guide column. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The embodiments of the present invention will now be described.

[0032] Please refer to the following: An IGBT module welding fixture. Figure 1 - Figure 10 The assembly includes a welding table 1, a reserved compartment 3, an IGBT module assembly 42, and a limiting clamp 43. The reserved compartment 3 is provided at the upper end of the welding table 1. The limiting clamp 43 is movably installed at the upper end of the reserved compartment 3. The IGBT module assembly 42 is movably installed at one end of the welding table 1, and the IGBT module assembly 42 is movably connected to the limiting clamp 43. The limiting clamp 43 has multiple sets of reserved holes, and PIN pins and DBCs are movably installed inside the multiple sets of reserved holes. The upper end of the welding table 1 is equipped with a first electric heating module 2 and a third electric heating module 6, and the first electric heating module 2 and the third electric heating module 6 are movably connected to the IGBT module assembly 42. The reserved compartment 3 has two sets of second electric heating modules 5 movably installed inside, and both sets of second electric heating modules 5 are movably connected to the limiting clamp 43. Multiple sets of PIN pins are inserted into the reserved holes of the limiting clamp 43, and then DBCs are inserted into the multiple sets of reserved holes. One end of the multiple sets of PIN pins is heat-welded to the multiple sets of reserved holes. Then the limiting clamp 43 is heat-welded to the IGBT module assembly, which improves the connection strength of the PIN pins. Two sets of transfer clamps 17 are movably installed on the upper end of the welding table 1. Both sets of transfer clamps 17 are provided with locking grooves 18, and the inner walls of the two sets of locking grooves 18 are movably connected to the outer wall of the IGBT module assembly 42. The two sets of transfer clamps 17 respectively drive the IGBT module assembly 42 to move. Multiple sets of guide posts 44 are installed on the upper end of the welding table 1. Multiple sets of reserved holes are opened on the IGBT module assembly 42, and the inner walls of the multiple sets of reserved holes are movably connected to the outer walls of the multiple sets of guide posts 44. Guide rods 4 are symmetrically installed on the upper end of the welding table 1, and two sets of guide rods 4 are located on the upper end of the reserved compartment 3.

[0033] Please see Figure 2 - Figure 4 The welding station 1 is equipped with multiple sets of first hydraulic pumps 7. Each set of first hydraulic pumps 7 has a first hydraulic column 8 installed at its output end. Two sets of first hydraulic columns 8 have a first limiting plate 9 installed at one end. Two other sets of first hydraulic columns 8 have a second limiting plate 10 installed at one end. The remaining two sets of first hydraulic columns 8 have a third limiting plate 11 installed at one end. The reserved compartment 3 is equipped with a second hydraulic pump 12. The output end of the second hydraulic pump 12 has a second hydraulic column 13 installed. One end of the second hydraulic column 13 has a connecting plate 14 installed. The two ends of the connecting plate 14 are respectively connected to two sets of second electric heating modules 5. When the multiple sets of first hydraulic pumps 7 are started, they drive the multiple sets of first hydraulic columns 8 to move, thereby driving the first limiting plate 9, the second limiting plate 10, and the third limiting plate 11 to move. When the second hydraulic pump 12 is started, it drives the second hydraulic column 13 to move, thereby driving the connecting plate 14 to move, and then driving the two sets of second electric heating modules 5 to move.

[0034] Please see Figure 3 - Figure 5 The welding station 1 is equipped with two sets of drive motors 15. The output ends of the two sets of drive motors 15 are equipped with transfer shafts 16, and one end of each set of transfer shafts 16 is connected to one end of each set of transfer clamps 17. When the two sets of drive motors 15 are started, they drive the two sets of transfer shafts 16 to rotate, thereby causing the two sets of transfer clamps 17 to flip.

[0035] Please see Figure 5 - Figure 8 Both sets of transfer clamps 17 are equipped with a first micro motor 19 and a second micro motor 24. The output ends of both sets of first micro motors 19 are equipped with a first drive shaft 20, and one end of both sets of first drive shafts 20 is equipped with a first drive gear 21. The output ends of both sets of second micro motors 24 are equipped with a second drive shaft 25, and one end of both sets of second drive shafts 25 is equipped with a second drive gear 26. When the first micro motors 19 and the second micro motors 24 are started, they drive the first drive shafts 20 and the second drive shafts 25 to rotate, thereby driving the first drive gears 21 and the second drive gears 26 to rotate.

[0036] Please see Figure 5 - Figure 8 Both sets of transfer clamps 17 have a first drive shaft 22 movably installed inside. Each of the two sets of first drive shafts 22 has a first drive gear 23 installed at one end, and the two sets of first drive gears 23 are respectively meshed with two sets of first drive gears 21. Both sets of transfer clamps 17 have first connecting shafts 29 symmetrically installed inside. Multiple sets of first connecting shafts 29 are respectively connected to the two sets of first drive shafts 20 and the two sets of first drive shafts 22 by toothed synchronous belts. When the first drive gear 21 rotates, it meshes with the first drive gear 23. When the first drive gear 23 rotates, it drives the first drive shaft 22 to rotate. The rotation direction of the first drive shaft 20 is opposite to that of the first drive shaft 22. The first drive shaft 20 and the first drive shaft 22 are respectively connected to the two sets of first connecting shafts 29 through toothed synchronous belts, so the two sets of first connecting shafts 29 rotate.

[0037] Please see Figure 5 - Figure 8 Each of the multiple sets of first connecting shafts 29 has a first connecting bevel gear 30 installed at one end. The outer walls of the two sets of transfer clamps 17 are symmetrically equipped with first limiting shafts 31. Each of the multiple sets of first limiting shafts 31 extends into the interior of the two sets of transfer clamps 17 and has a first limiting bevel gear 32 installed at one end. The multiple sets of first limiting bevel gears 32 are respectively meshed with the multiple sets of first connecting bevel gears 30. The outer walls of the multiple sets of first limiting shafts 31 can be equipped with first baffles 33. When the two sets of first connecting shafts 29 rotate, they drive the two sets of first connecting bevel gears 30 to rotate. The two sets of first connecting bevel gears 30 are respectively meshed with the two sets of first limiting bevel gears 32. Therefore, when the two sets of first limiting bevel gears 32 rotate, they drive the two sets of first limiting shafts 31 to rotate, which in turn drives the two sets of first baffles 33 to rotate around the two sets of first limiting shafts 31.

[0038] Please see Figure 5 - Figure 8Both sets of transfer clamps 17 have a second drive shaft 27 movably installed inside. Each of the two sets of second drive shafts 27 has a second drive gear 28 installed at one end, and the two sets of second drive gears 28 are respectively meshed with two sets of second drive gears 26. Both sets of transfer clamps 17 have a second connecting shaft 34 symmetrically installed inside. Multiple sets of second connecting shafts 34 are respectively connected to two sets of second drive shafts 25 and two sets of second drive shafts 27 by toothed synchronous belts. When the second drive gear 26 rotates, it meshes with the second drive gear 28, and the second drive gear 28 rotates, thereby driving the second drive shaft 27 to rotate. The rotation direction of the second drive shaft 25 is opposite to that of the second drive shaft 27. The second drive shaft 25 and the second drive shaft 27 are respectively connected to the two sets of second connecting shafts 34 through toothed synchronous belts, so the two sets of second connecting shafts 34 rotate.

[0039] Please see Figure 5 - Figure 8 Each of the multiple sets of second linkage shafts 34 has a second linkage bevel gear 35 installed at one end. The outer walls of the two sets of transfer clamps 17 are symmetrically equipped with second limiting shafts 36. The multiple sets of second limiting shafts 36 extend into the interior of the two sets of transfer clamps 17, and each of the two ends is equipped with a second limiting bevel gear 37. The multiple sets of second limiting bevel gears 37 are respectively meshed with the multiple sets of second linkage bevel gears 35. The outer walls of the multiple sets of second limiting shafts 36 can be equipped with second baffles 38. When the two sets of second linkage shafts 34 rotate, they drive the two sets of second linkage bevel gears 35 to rotate. The two sets of second linkage bevel gears 35 are respectively meshed with the two sets of second limiting bevel gears 37. Therefore, when the two sets of second limiting bevel gears 37 rotate, they drive the two sets of second limiting shafts 36 to rotate, which in turn drives the two sets of second baffles 38 to rotate around the two sets of second limiting shafts 36.

[0040] Please see Figure 2 - Figure 9 An air purification device 39 is installed inside the welding station 1. Multiple sets of suction plates 41 are installed on the upper end of the welding station 1, and each set of suction plates 41 is connected to the air purification device 39 by a suction pipe 40. When the air purification device 39 is activated, the multiple sets of suction plates 41 generate suction to absorb the harmful gases generated by the hot welding operation, and transmit the harmful gases to the air purification device 39 through the multiple sets of suction pipes 40. The air purification device 39 treats the harmful gases and then discharges them.

[0041] The working principle of this invention is as follows: When the worker performs soldering operation on the IGBT module assembly 42, the worker places the IGBT module assembly 42 on the upper end of the first electric heating module 2. The multiple sets of reserved holes opened on the IGBT module assembly 42 correspond to the multiple sets of guide posts 44 respectively. Then the worker applies solder paste to the upper end of the IGBT module assembly 42, and the first electric heating module 2 is activated to perform preliminary hot soldering operation on the IGBT module assembly 42. When the IGBT module assembly 42 is initially hot-welded, the worker tilts the limiting clamp 43 onto the upper end of the reserved chamber 3, and the two sets of guide rods 4 limit it from both sides of the limiting clamp 43. Then, the worker puts multiple sets of PIN pins into the reserved holes opened in the multiple sets of limiting clamps 43. Then, the worker puts multiple sets of DBCs into the multiple sets of reserved holes. Then, the two sets of second electric heating modules 5 are activated, and the multiple sets of DBCs initially hot-weld the multiple sets of PIN pins into the multiple sets of reserved holes. After the IGBT module assembly 42 completes the initial hot welding, a set of drive motors 15 are started, which drives a set of transfer shafts 16 to rotate, thereby driving a set of transfer clamps 17 to rotate. The set of transfer clamps 17 moves to the upper area of ​​the first electric heating module 2. When a set of transfer clamps 17 rotates, the second micro motor 24 starts, driving the second drive shaft 25 to rotate, which in turn drives the second drive gear 26 to rotate. The second drive gear 26 meshes with the second transmission gear 28. The second transmission gear 28 rotates, which in turn drives the second transmission shaft 27 to rotate. The rotation direction of the second drive shaft 25 is opposite to that of the second transmission shaft 27. The second drive shaft 25 and the second transmission shaft 27 are respectively connected to two sets of second connecting shafts 34 through toothed synchronous belts. Therefore, the two sets of second connecting shafts 34 rotate, which in turn drives two sets of second connecting bevel gears 35 to rotate. The two sets of second connecting bevel gears 35 mesh with two sets of second limiting bevel gears 37, which in turn rotate, which in turn drives two sets of second limiting shafts 36 to rotate. This, in turn, causes the two sets of second baffles 38 to rotate around the two sets of second limiting shafts 36 as the center, thereby opening one end of the engaging groove 18. When one end of the locking groove 18 is opened, the two sets of first hydraulic pumps 7 start, driving the two sets of first hydraulic columns 8 to move upward, thereby driving the two sets of first limiting plates 9 to move upward. The two sets of first limiting plates 9 cooperate to push the IGBT module assembly 42 upward, thereby pushing the IGBT module assembly 42 into the locking groove 18. Then, the second micro motor 24 drives the second drive shaft 25 to rotate in the opposite direction, thereby driving the two sets of second baffles 38 to flip, so that the IGBT module assembly 42 is limited and fixed inside the locking groove 18. Then, the drive motor 15 starts, driving the transfer shaft 16 to rotate in the opposite direction, thereby driving the transfer clamp 17 to rotate, and then driving the IGBT module assembly 42 to move, so that the IGBT module assembly 42 moves to the upper end of the reserved compartment 3, and the IGBT module assembly 42 is in an inverted state. When the IGBT module assembly 42 moves to the upper end of the reserved compartment 3, the other two sets of first hydraulic pumps 7 start, driving the two sets of first hydraulic columns 8 to move upward, thereby driving the two sets of second limit plates 10 to move upward. The upper ends of the two sets of second limit plates 10 contact the IGBT module assembly 42 and support the IGBT module assembly 42. After the two sets of second limiting plates 10 support the IGBT module assembly 42, the first micro motor 19 starts, driving the first drive shaft 20 to rotate, thereby driving the first drive gear 21 to rotate. The first drive gear 21 meshes with the first transmission gear 23. The first transmission gear 23 rotates, thereby driving the first transmission shaft 22 to rotate. The rotation direction of the first drive shaft 20 is opposite to that of the first transmission shaft 22. The first drive shaft 20 and the first transmission shaft 22 are respectively connected to the two sets of first connecting shafts 29 through toothed synchronous belts. Therefore, the two sets of first connecting shafts 29 rotate, thereby driving the two sets of first connecting bevel gears 30 to rotate. The two sets of first connecting bevel gears 30 mesh with the two sets of first limiting bevel gears 32. Therefore, the two sets of first limiting bevel gears 32 rotate, thereby driving the two sets of first limiting shafts 31 to rotate. This causes the two sets of first baffles 33 to rotate around the two sets of first limiting shafts 31 as the center, thereby opening the other end of the engaging groove 18. When the other end of the locking groove 18 is opened, the other two sets of first hydraulic pumps 7 drive the two sets of first hydraulic columns 8 to move downward, thereby driving the two sets of second limiting plates 10 to move downward. The IGBT module assembly 42 moves downward with the two sets of second limiting plates 10. The drive motor 15 starts and drives a set of transfer clamps 17 to reset. The multiple sets of reserved holes opened in the IGBT module assembly 42 correspond to the multiple sets of guide columns 44. During the downward movement of the IGBT module assembly 42, the multiple sets of guide columns 44 enter the multiple sets of reserved holes opened in the IGBT module assembly 42. Then the second hydraulic pump 12 starts and drives the second hydraulic column 13 to move upward, thereby driving the second hydraulic column 13 to move upward, and then driving the connecting plate 14 to move upward, and then driving the two sets of second electric heating modules 5 to move upward, and pushing the limiting clamp 43 to move upward. The limiting clamp 43 is in contact with the IGBT module assembly 42, and the two sets of second electric heating modules 5 are in the starting state, so that the limiting clamp 43 and the IGBT module assembly 42 are initially heat-welded together. When the limiting clamp 43 and the IGBT module assembly 42 are initially heat-welded together, another set of drive motors 15 are started, which drives another set of transfer clamps 17 to flip, so that another set of locking slots 18 moves to the upper area of ​​the limiting clamp 43 and the IGBT module assembly 42. At the same time, the second micro motor 24 inside the other set of transfer clamps 17 is started, which causes the two sets of second baffles 38 to flip, opening one end of the locking slot 18. After one end of the locking groove 18 is opened, the second hydraulic pump 12 pushes the second hydraulic column 13 to move upward, thereby pushing the limiting clamp 43 and the IGBT module assembly 42 to move into the locking groove 18. Then the second micro motor 24 starts, and the two sets of second baffles 38 flip, thereby closing one end of the locking groove 18. After the limiting clamp 43 and the IGBT module assembly 42 are initially heat-welded, another set of drive motors 15 starts, driving another set of transfer clamps 17 to flip, thereby rotating the limiting clamp 43 and the IGBT module assembly 42 to the upper end of the third electric heating module 6. After the transfer clamp 17 is flipped, the remaining two sets of first hydraulic pumps 12 are started, driving the two sets of third limiting plates 11 to move. Both sets of third limiting plates 11 are in contact with the IGBT module assembly 42, and the two sets of third limiting plates 11 support the IGBT module assembly 42. Then, the first micro motor 24 is started, driving the two sets of first baffles 33 to flip, releasing the limiting fixation on the IGBT module assembly 42. Then, the remaining two sets of first hydraulic pumps 12 drive the two sets of first hydraulic columns 8 to move downward, thereby driving the two sets of third limiting plates 11 to move downward. The IGBT module assembly 42 moves downward with the two sets of third limiting plates 11 and comes into contact with the third electric heating module 6. The third electric heating module 6 is started and performs the final heat welding on the IGBT module assembly 42, improving the connection between the IGBT module assembly 42 and the limiting clamp 43. When the IGBT module assembly 42 and the limiting clamp 43 are subjected to hot welding operations, the air purification device 39 is continuously activated, causing multiple sets of suction plates 41 to generate suction, absorbing the harmful gases generated during the hot welding operation, and transmitting the harmful gases to the air purification device 39 through multiple sets of suction pipes 40. The air purification device 39 treats the harmful gases and then discharges them. In addition, the multiple sets of suction plates 41 accelerate the airflow velocity in the upper area of ​​the welding table 1. After the initial welding of the IGBT module assembly 42 and the limiting clamp 43, the air purification device 39 accelerates the cooling of the IGBT module assembly 42 and the limiting clamp 43 after the initial welding, improves the stability of the IGBT module assembly 42 and the limiting clamp 43 after the initial welding, and protects the transport of the IGBT module assembly 42 and the limiting clamp 43 after the initial welding.

[0042] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An IGBT module welding fixture, comprising a welding table (1), a reserved compartment (3), an IGBT module assembly (42), and a limiting clamp (43), characterized in that: The welding table (1) has a reserved compartment (3) at the upper end, and a limiting clamp (43) is movably installed at the upper end of the reserved compartment (3). An IGBT module assembly (42) is movably installed at one end of the welding table (1), and the IGBT module assembly (42) is movably connected to the limiting clamp (43). The limiting clamp (43) has multiple sets of reserved holes, and PIN pins and DBCs are movably installed inside the multiple sets of reserved holes. The upper end of the welding table (1) is equipped with a first electric heating module (2) and a third electric heating module (6), and the first electric heating module (2) and the third electric heating module (6) are movably connected to the IGBT module assembly (42). The reserved compartment (3) is movably installed with two sets of second electric heating modules (5), and both sets of second electric heating modules (5) are movably connected to the limiting clamp (43). The welding table (1) is movably mounted with two sets of transfer clamps (17). Both sets of transfer clamps (17) are provided with locking grooves (18), and the inner walls of both sets of locking grooves (18) are movably connected to the outer wall of the IGBT module assembly (42). The welding table (1) is equipped with multiple sets of guide columns (44) at its upper end. The IGBT module assembly (42) has multiple sets of reserved holes, and the inner walls of the multiple sets of reserved holes are movably connected to the outer walls of the multiple sets of guide columns (44). The welding table (1) is symmetrically equipped with guide rods (4), and two sets of guide rods (4) are located at the upper end of the reserved compartment (3).

2. The IGBT module welding fixture according to claim 1, characterized in that: The welding station (1) is equipped with multiple sets of first hydraulic pumps (7). Each set of first hydraulic pumps (7) has a first hydraulic column (8) installed at its output end. Two sets of first hydraulic columns (8) have a first limiting plate (9) installed at one end. Two other sets of first hydraulic columns (8) have a second limiting plate (10) installed at one end. The remaining two sets of first hydraulic columns (8) have a third limiting plate (11) installed at one end. The reserved compartment (3) is equipped with a second hydraulic pump (12). The output end of the second hydraulic pump (12) is equipped with a second hydraulic column (13). One end of the second hydraulic column (13) is equipped with a connecting plate (14), and both ends of the connecting plate (14) are connected to two sets of second electric heating modules (5).

3. The IGBT module welding fixture according to claim 1, characterized in that: The welding station (1) is equipped with two sets of drive motors (15). The output ends of the two sets of drive motors (15) are equipped with transfer shafts (16), and one end of each set of transfer shafts (16) is connected to one end of each set of transfer clamps (17).

4. The IGBT module welding fixture according to claim 3, characterized in that: Both sets of transfer clamps (17) are equipped with a first micro motor (19) and a second micro motor (24). The output ends of the first micro motors (19) are equipped with a first drive shaft (20). One end of the first drive shafts (20) is equipped with a first drive gear (21). The output ends of the second micro motors (24) are equipped with a second drive shaft (25). One end of the second drive shafts (25) is equipped with a second drive gear (26).

5. The IGBT module welding fixture according to claim 4, characterized in that: Both sets of transfer clamps (17) are equipped with a first drive shaft (22), and a first drive gear (23) is installed at one end of each set of first drive shafts (22). The two sets of first drive gears (23) are respectively meshed with two sets of first drive gears (21). Both sets of transfer clamps (17) are symmetrically equipped with first connecting shafts (29), and multiple sets of first connecting shafts (29) are respectively connected to the two sets of first drive shafts (20) and the two sets of first drive shafts (22) by toothed synchronous belts.

6. The IGBT module welding fixture according to claim 5, characterized in that: Each of the multiple sets of first connecting shafts (29) is equipped with a first connecting bevel gear (30) at one end. The outer walls of the two sets of transfer clamps (17) are symmetrically equipped with first limiting shafts (31). Each of the multiple sets of first limiting shafts (31) extends into the interior of the two sets of transfer clamps (17) and is equipped with a first limiting bevel gear (32) at one end. The multiple sets of first limiting bevel gears (32) are respectively meshed with the multiple sets of first connecting bevel gears (30). The outer walls of the multiple sets of first limiting shafts (31) can be equipped with first baffles (33).

7. The IGBT module welding fixture according to claim 4, characterized in that: The two sets of transfer clamps (17) are each equipped with a second drive shaft (27). Each of the two sets of second drive shafts (27) is equipped with a second drive gear (28) at one end. The two sets of second drive gears (28) are respectively meshed with two sets of second drive gears (26). The two sets of transfer clamps (17) are each symmetrically equipped with a second connecting shaft (34). The multiple sets of second connecting shafts (34) are respectively connected to the two sets of second drive shafts (25) and the two sets of second drive shafts (27) by toothed synchronous belts.

8. The IGBT module welding fixture according to claim 7, characterized in that: Each of the multiple sets of second linkage shafts (34) is equipped with a second linkage bevel gear (35) at one end. The outer walls of the two sets of transfer clamps (17) are symmetrically equipped with second limiting shafts (36). The multiple sets of second limiting shafts (36) extend into the interior of the two sets of transfer clamps (17) and are equipped with second limiting bevel gears (37) at both ends. The multiple sets of second limiting bevel gears (37) are respectively meshed with the multiple sets of second linkage bevel gears (35). The outer walls of the multiple sets of second limiting shafts (36) can be equipped with second baffles (38).

9. The IGBT module welding fixture according to claim 1, characterized in that: The welding station (1) is equipped with an air purification device (39). Multiple sets of air suction plates (41) are installed on the upper end of the welding station (1), and each set of air suction plates (41) is connected to the air purification device (39) by an air suction pipe (40).

10. An IGBT module welding fixture and its welding process, characterized in that... Using the process described in any one of claims 1-9 Includes the following steps: S1: Preliminary welding of IGBT module assembly (42): The IGBT module assembly (42) is placed on the top of the first electric heating module (22) for preliminary welding; S2: Preliminary welding of the limiting clamp (43) and the PIN: The limiting clamp (43) is inverted on the upper end of the reserved compartment (3), the PIN is inserted into the reserved holes of multiple sets of limiting clamps (43), and the second electric heating module (5) welds the limiting clamp (43) and the PIN. S3: Initial welding of IGBT module assembly (42) and limiting clamp (43): The transfer clamp (17) drives the IGBT module assembly (42) to move, so that the IGBT module assembly (42) and the limiting clamp (43) fit together, and the second electric heating module (5) welds the limiting clamp (43) and the IGBT module assembly (42); S4: Final welding of IGBT module assembly (42): The transfer clamp (17) moves the IGBT module assembly (42) so that the IGBT module assembly (42) falls onto the upper end of the third electric heating module (6), and the third electric heating module (6) performs final heat welding on the IGBT module assembly (42).

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