Terminal welding tool and welding process of crimping type power module

Abstract

The present invention provides a terminal welding tool for a crimping power module and a welding process thereof, which relates to the field of power semiconductor technology. The welding tool comprises a pin carrier, and the pin carrier comprises a carrier body, on which a first mounting cavity is arranged; a welding jig is arranged in the first mounting cavity to plug in a power terminal, and a first pin area and a second pin area for plugging in the power terminal are arranged on the welding jig; an assembly platform of the welding tool comprises an assembly platform body, on which a second mounting cavity matching the shape of the welding jig is arranged, and a module substrate is stacked on one side of a first flexible material plate of the welding jig. The contact surface between the welding jig and the power terminal of the present invention adopts a high temperature resistant flexible material, which effectively improves the problem of scratch failure of the power terminal during operation; by arranging a first guide hole and a second guide hole, the posture consistency of the crimping power terminal during welding is ensured, and the mechanical impact resistance of the power terminal and the directional consistency of the terminal crimping hole are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power semiconductors, and in particular to a terminal welding tool for a crimping type power module and a welding process thereof. Background Art

[0002] The power module welding terminal connects the wire to the terminal by welding. It has high connection strength, good electrical performance, can provide stable connection, withstand a certain degree of vibration and impact, and is not easy to loosen. For example, in the power modules of some industrial control equipment, welding terminals can ensure stable current transmission under complex working conditions. However, the welding process is relatively complicated and requires special equipment and certain techniques. Once the welding is completed, it is troublesome to repair or replace the wire, and re-welding may be required.

[0003] Crimp terminals use mechanical pressure to tightly connect the terminals and wires. This connection method is easy to operate and efficient. It does not require a high-temperature process like welding, and will not have a thermal impact on the material properties of the terminals and wires during connection. Moreover, if the wire needs to be replaced, the crimping method is easier to disassemble and re-crimp.

[0004] However, the connection strength and electrical performance of crimp terminals may not be as good as those of welding terminals under certain extreme conditions. For example, in an environment of high humidity and strong vibration, they may become loose after long-term use, resulting in poor contact.

[0005] After the crimped power module is welded using the welding power terminal process, the verticality tolerance of the power terminal is too large. The welding limit fixture of the welding power terminal is generally made of alloy aluminum as the main material. During the assembly of the power terminal to the limit fixture before welding, the too hard fit can easily cause scratches on the surface of the power terminal, the impact-resistant functional area of ​​the power terminal cannot be consistent in direction, the crimping hole at the top of the power terminal is in the wrong direction, the application end cannot be used, and the solder climbing around the welding surface of the power terminal is irregular. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a terminal welding tool for a crimping type power module and a welding process thereof, so as to solve the problem of needle scratches during the tooling insertion process before welding of the crimping type power terminal, the problem of consistency of the crimping hole orientation after welding of the crimping type power terminal, and the problem of uniformity of solder between the terminal and the copper-clad lining plate welding surface during the welding process of the crimping type power terminal.

[0007] The technical solution adopted by the present invention is:

[0008] A terminal welding tool for a crimping type power module, wherein the crimping type power module comprises a module substrate and a power terminal welded on the module substrate, and the terminal welding tool for the crimping type power module comprises:

[0009] A pin carrier, the pin carrier comprising a carrier body, and at least one first mounting cavity is provided on the carrier body;

[0010] A welding jig, wherein the welding jig is arranged in the first mounting cavity to plug in the power terminal, the welding jig comprises a jig body, at least one first high temperature resistant flexible material board is arranged on one side of the jig body, a first pin area is arranged on the first high temperature resistant flexible material board, a second high temperature resistant flexible material board is arranged on the other side of the jig body at a position corresponding to the first high temperature resistant flexible material board, a second pin area is arranged on the second high temperature resistant flexible material board at a position corresponding to the first pin area, and the first pin area and the second pin area are correspondingly plugged in with power terminals; guide columns are arranged around each of the first high temperature resistant flexible material boards, and an inverted compression spring is arranged on the side of the guide column close to the jig body, so that the module terminal welding assembly automatically forms a downward pressure after being flipped over;

[0011] A welding tool assembly platform, the welding tool assembly platform includes an assembly platform body, and at least one second mounting cavity matching the shape of the welding jig is arranged on the assembly platform body. When the module substrate and the welding jig are assembled, the module substrate is stacked on one side of the first high-temperature resistant flexible material plate of the welding jig.

[0012] Preferably, in the terminal welding tooling of the crimping type power module, a carrier coding plate mounting groove is arranged on a side of the carrier body close to the first mounting cavity, a third mounting cavity is arranged in the first mounting cavity, and step portions are arranged on both sides of the third mounting cavity, and the step portions are extended along the width direction of the first mounting cavity.

[0013] Preferably, in the terminal welding tool for the crimping type power module, the third mounting cavity matches the shape of the second high temperature resistant flexible material plate, the first mounting cavity on the step portion matches the shape of the fixture body; and a carrier reference point is also provided on the carrier body.

[0014] Preferably, in the terminal welding tool for the crimping type power module, avoidance areas are arranged around the jig body, assembly columns are arranged on the avoidance areas, a fixing plate is arranged on the side of the second high temperature resistant flexible material plate facing away from the jig body, fixing holes are arranged on the second high temperature resistant flexible material plate and the fixing plate at positions corresponding to the guide columns, and the fixing holes are plugged into and matched with the guide columns arranged correspondingly thereto.

[0015] Preferably, the terminal welding tool of the crimping type power module is provided with a plurality of first guide holes spaced apart on a first high temperature resistant flexible material plate on the first pin area, and a plurality of second guide holes spaced apart on a second high temperature resistant flexible material plate on the second pin area, and the number of the first guide holes and the second guide holes are the same and correspond one to one to connect the power terminals.

[0016] Preferably, the terminal welding tool of the crimping type power module, wherein the module substrate includes a stacked AMB ceramic copper-clad liner, a welding sheet and a heat dissipation copper substrate; when the module substrate and the welding jig are assembled, the heat dissipation copper substrate is stacked on one side of the first high-temperature resistant flexible material plate of the welding jig; mounting holes are arranged around the heat dissipation copper substrate corresponding to the positions of each of the assembly columns, and the assembly columns cooperate with the mounting holes arranged corresponding to them.

[0017] Preferably, the terminal welding tooling of the crimping type power module is as follows: wherein L-shaped limit members are arranged around the second mounting cavity, a first limit groove is formed on the inner periphery of the limit member, a shape-matching height limit block is arranged on the inner periphery of the limit member, a second limit groove is formed on the inner wall of the limit member and the top surface of the height limit block; when the module substrate and the welding jig are assembled, a second high-temperature resistant flexible material plate is arranged in the second mounting cavity, and a shape-matching jig body is arranged on the second limit grooves around it.

[0018] Preferably, in the terminal welding tool for the crimping type power module, the height of the height limiting block is greater than the length of the power terminal, and the height of the height limiting block is less than the height of the limiting member.

[0019] The present invention also provides a welding process using a terminal welding tool for a crimping type power module, comprising the following steps:

[0020] Step S1. Place the second high temperature resistant flexible material plate of the welding jig in the third mounting cavity, and place the jig body in the first mounting cavity on the step portion in a matching shape, and then plug a plurality of power terminals into the first guide holes and the second guide holes of the welding jig to complete the power terminal plugging;

[0021] Step S2. Place the second high temperature resistant flexible material plate of the welding jig in which the power terminal is plugged in step S1 into the second mounting cavity of the welding tool assembly platform, and place the jig body in the second limiting groove, then stack and weld the AMB ceramic copper-clad liner, the welding sheet and the heat dissipation copper substrate to obtain the module substrate, and then stack the heat dissipation copper substrate on one side of the first high temperature resistant flexible material plate of the welding jig, and finally install the mounting holes of the heat dissipation copper substrate corresponding to the assembly columns to obtain the assembled module terminal welding assembly;

[0022] Step S3. Take out the module terminal welding assembly from the welding tool assembly platform, flip the module terminal welding assembly 180 degrees, and under the action of the inverted compression spring, the fixing plate and the second high temperature resistant flexible material plate press down the top of the power terminal;

[0023] Step S4. Place the terminal welding assembly processed in step S3 into a welding equipment carrier for welding;

[0024] Step S5. Take out the terminal welding assembly welded in step S4, and then separate the module with completed power terminal welding from the welding fixture to obtain a crimping type power module with welded power terminals.

[0025] Preferably, in the welding process, the welding parameters in step S4 are as follows: the heating rate in the welding heating stage is 1-3°C / s, when the temperature of the welding equipment cavity reaches 205-215°C, the welding equipment cavity is evacuated to <5mbar, the welding equipment cavity begins to be filled with formic acid with a purity of ≥97% until the pressure reaches 550-650mbar, and then the oxide on the surface of the welding material is reduced, and the reduction treatment time is 60-90s; thereafter, the welding equipment continues to heat up to a maximum temperature that is 20-30°C higher than the melting point of the solder, and after the welding reaches the maximum temperature, the welding equipment is evacuated to <10mbar to degas the welding layer, and the vacuum pressure is maintained for 60-90s during the degassing treatment, and then the pressure is released, and the pressure release rate is 40-60mbar / s, and the temperature is lowered after the welding is completed, and the cooling rate is 1-3°C / s.

[0026] Advantages of the present invention:

[0027] The terminal welding tool and welding process of the crimping type power module of the present invention are designed with high-temperature resistant flexible materials for the contact surface between the welding jig and the power terminal, which effectively improves the scratch failure problem of the power terminal during operation; by setting a plurality of first guide holes on the first pin area and a plurality of second guide holes arranged at intervals on the second pin area, the posture consistency of the crimping type power terminal is ensured during the welding process of the welding tool, and the mechanical impact resistance of the power terminal and the directional consistency of the terminal crimping hole are effectively improved; an inverted compression spring is set on the side of the guide column close to the jig body, so that the module terminal welding assembly automatically forms a downward pressure after being flipped, thereby ensuring the consistency of solder distribution on the welding surface of the power terminal and ensuring the consistency of the vertical and horizontal directions of the power terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the pin carrier of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the welding jig of the present invention.

[0030] Figure 3 It is a structural schematic diagram of the welding tool assembly platform of the present invention.

[0031] Figure 4 It is a schematic diagram of the welding process of the terminal welding tool of the crimping type power module of the present invention.

[0032] Figure 5 Schematic diagram of a welding type power terminal in the prior art.

[0033] Figure 6 for Figure 5 A partial enlarged view of middle A.

[0034] Figure 7 Schematic diagram of a welding power terminal crimping type power module of Example 2.

[0035] Figure 8 for Figure 7 A partial enlarged view of B.

[0036] Fig. 9 Microscope image of a soldered power terminal using existing soldering technology.

[0037] Fig.10 This is a microscope image of the welded power terminal crimping type power module of Example 2. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments.

[0039] Example 1

[0040] like Figure 1-Figure 3 A terminal welding tool for a crimping type power module, the crimping type power module comprising a module substrate and a power terminal welded on the module substrate, the terminal welding tool for the crimping type power module comprising:

[0041] A pin carrier 1, the pin carrier 1 comprises a carrier body 11, and at least one first mounting cavity 14 is provided on the carrier body 11;

[0042] A welding jig 2, wherein the welding jig 2 is arranged in the first mounting cavity 14 to plug in the power terminal, and the welding jig 2 comprises a jig body 21, wherein at least one first high temperature resistant flexible material plate 24 is arranged on one side of the jig body 21, and a first pin area is arranged on the first high temperature resistant flexible material plate 24, and a second high temperature resistant flexible material plate 29 is arranged on the other side of the jig body 21 at a position corresponding to the first high temperature resistant flexible material plate 24, and a second pin area is arranged on the second high temperature resistant flexible material plate 29 at a position corresponding to the first pin area, and the first pin area and the second pin area are correspondingly plugged in with power terminals; guide posts 25 are arranged around each of the first high temperature resistant flexible material plates 24, and an inverted compression spring 27 is arranged on one side of the guide posts 25 close to the jig body 21, so that the module terminal welding assembly automatically forms downward pressure after being flipped;

[0043] The welding tool assembly platform 3 includes an assembly platform body 31, and at least one second mounting cavity 34 matching the shape of the welding fixture 2 is arranged on the assembly platform body 31. When the module substrate and the welding fixture 2 are assembled, the module substrate is stacked on one side of the first high-temperature resistant flexible material plate 24 of the welding fixture 2.

[0044] A carrier code plate installation groove 12 is provided on one side of the carrier body 11 close to the first installation cavity 14 . A third installation cavity 16 is provided in the first installation cavity 14 . Step portions 15 are provided on both sides of the third installation cavity 16 . The step portions 15 extend along the width direction of the first installation cavity 14 .

[0045] The third installation cavity 16 matches the shape of the second high temperature resistant flexible material plate 29 , and the first installation cavity 14 on the step portion 15 matches the shape of the fixture body 21 ; a carrier reference point 13 is also provided on the carrier body 11 .

[0046] An avoidance area 23 is arranged around the jig body 21, and an assembly column 22 is arranged on the avoidance area 23. A fixing plate 28 is arranged on the side of the second high-temperature resistant flexible material plate 29 facing away from the jig body 21. Fixing holes are arranged at positions corresponding to the guide columns 25 on the second high-temperature resistant flexible material plate 29 and the fixing plate 28, and the fixing holes are plugged into and matched with the guide columns 25 arranged correspondingly thereto.

[0047] The first high temperature resistant flexible material plate 24 and the second high temperature resistant flexible material plate 29 are made of high temperature resistant flexible material, which is selected from perfluoro rubber plate or asbestos rubber plate, but is not limited to the above two materials.

[0048] The first pin area is provided with a plurality of first guide holes 26 arranged at intervals on the first high temperature resistant flexible material plate 24, and the second pin area is provided with a plurality of second guide holes 30 arranged at intervals on the second high temperature resistant flexible material plate 29. The number of the first guide holes 26 and the second guide holes 30 are the same and correspond one to one to connect the power terminals.

[0049] The module substrate includes a stacked AMB ceramic copper-clad liner, a welding sheet and a heat-dissipating copper substrate. When the module substrate and the welding jig 2 are assembled, the heat-dissipating copper substrate is stacked on one side of the first high-temperature resistant flexible material plate 24 of the welding jig 2; mounting holes are arranged around the heat-dissipating copper substrate corresponding to the positions of the assembly columns 22, and the assembly columns 22 cooperate with the mounting holes arranged corresponding to them.

[0050] An L-shaped limiting member 32 is arranged around the second mounting cavity 34, a first limiting groove is formed on the inner periphery of the limiting member 32, a height limiting block 33 of a matching shape is arranged on the inner periphery of the first limiting groove, a second limiting groove 35 is formed by the inner wall of the limiting member 32 and the top surface of the height limiting block 33, and when the module substrate and the welding fixture 2 are assembled, a second high-temperature resistant flexible material plate 29 is arranged in the second mounting cavity 34, and a fixture body 21 of a matching shape is arranged on the second limiting grooves 35 around the limiting member 32; the height of the height limiting block 33 is greater than the length of the power terminal, and the height of the height limiting block 33 is less than the height of the limiting member 32.

[0051] Example 2

[0052] like Figure 4 A welding process using a terminal welding tool for a crimping type power module comprises the following steps:

[0053] Step S1. Figure 4 In the numbers 4 and 5, the second high temperature resistant flexible material plate 29 of the welding jig 2 is placed in the third installation cavity 16, and the jig body 21 is placed in the first installation cavity 14 on the step portion 15 in a shape-matched manner, and then a plurality of power terminals are plugged into the first guide holes 26 and the second guide holes 30 of the welding jig 2 to complete the power terminal plugging;

[0054] Step S2. Figure 4 In step 6, the second high temperature resistant flexible material plate 29 of the welding fixture 2 with the power terminal plugged in step S1 is placed in the second installation cavity 34 of the welding tool assembly platform 3, and the fixture body 21 is placed in the second limiting groove 35, and then the AMB ceramic copper clad liner, the welding sheet and the heat dissipation copper substrate are stacked and welded to obtain a module substrate, such as Figure 4Numbers 7 and 8, then the heat dissipation copper substrate 5 is stacked on one side of the first high temperature resistant flexible material plate 24 of the welding fixture 2, and finally the mounting holes of the heat dissipation copper substrate 5 are mounted corresponding to the assembly columns 22 to obtain an assembled module terminal welding assembly;

[0055] Step S3. Figure 4 At number 9, the module terminal welding assembly is taken out from the welding tool assembly platform 3, the module terminal welding assembly is reversed 180 degrees, and under the action of the inverted compression spring 27, the fixing plate 28 and the second high temperature resistant flexible material plate 29 press down the top of the power terminal;

[0056] Step S4. Place the terminal welding assembly processed in step S3 into a welding equipment carrier for welding;

[0057] The welding parameters are as follows: the heating rate in the welding heating stage is 2°C / s. When the temperature of the welding chamber reaches 210°C, the welding equipment chamber is evacuated to <5mbar. The welding equipment chamber begins to be filled with formic acid with a purity of ≥97% until the pressure reaches 600mbar. Then, the oxide on the surface of the welding material is reduced for 60s. After that, the welding equipment continues to heat up to a maximum temperature that is 25°C higher than the melting point of the solder. After the welding reaches the maximum temperature, the welding equipment is evacuated to <10mbar to degas the welding layer. During the degassing treatment, the vacuum pressure is maintained for 80s, and then the pressure is released at a rate of 50mbar / s. After the welding is completed, the temperature is lowered at a rate of 2°C / s.

[0058] Step S5. Take out the terminal welding assembly welded in step S4, and then separate the module with completed power terminal welding from the welding fixture to obtain a crimping type power module with welded power terminals.

[0059] Figure 5 Schematic diagram of a welding power terminal in the prior art. Figure 6 for Figure 5 A partial enlarged view of the middle A. Figure 7 Schematic diagram of a welding power terminal crimping type power module of Example 2, Figure 8 for Figure 7 A partial enlarged view of B.

[0060] Figure 5 41 indicates uneven solder, 42 indicates inconsistent direction of the impact-resistant functional area, 43 indicates inconsistent direction of the crimping port, and 44 indicates scratches on the power terminal. Figure 5 and Figure 6It can be concluded that after the crimping power module is welded using the welding power terminal process, the verticality tolerance of the power terminal is too large. The welding limit fixture of the welding power terminal is generally made of alloy aluminum as the main material. During the assembly of the power terminal to the limit fixture before welding, the hard fit can easily cause scratches on the surface of the power terminal, the impact-resistant functional area of ​​the power terminal cannot be consistent in direction, the crimping hole at the top of the power terminal is in the wrong direction, and the application end cannot be used. The solder climbs irregularly around the welding surface of the power terminal.

[0061] Figure 7 51 indicates uniform solder, 52 indicates no scratches on the power terminal, 53 indicates the direction of the impact resistance functional area is consistent, 54 and 55 indicate the direction of the crimping port is consistent, Figure 7 and Figure 8 It can be concluded that the welding jig of the present invention uses high-temperature resistant flexible material on the contact surface with the power terminal, which effectively improves the scratch failure problem of the power terminal during operation; by setting a plurality of first guide holes on the first pin area and a plurality of spaced second guide holes on the second pin area, the posture consistency of the crimping type power terminal is ensured during the welding process of the welding tool, and the mechanical impact resistance of the power terminal and the direction consistency of the terminal crimping hole are effectively improved; an inverted compression spring is set on the side of the guide column close to the jig body, so that the module terminal welding assembly automatically forms a downward pressure after being flipped, ensuring the consistency of solder distribution on the welding surface of the power terminal, and ensuring the consistency of the vertical and horizontal directions of the power terminal.

[0062] Fig. 9 Figures a and b are microscope images of the soldering type power terminal of the existing soldering technology. It can be seen that the S-bend and the pressure interface directions of the anti-seismic zone are inconsistent, and the solder at the bottom of the soldering does not overflow obviously, resulting in poor soldering stability of the soldering type power terminal. Fig.10 Figures a and b are microscope images of the welded power terminal crimping type power module of Example 2. The S-bend in the seismic area and the crimping interface are in the same direction, the solder overflow effect on the welding surface is also better, and the welding stability of the welded power terminal is good.

[0063] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A terminal welding tool for a crimping type power module, characterized in that: The crimping type power module comprises a module substrate and power terminals welded on the module substrate, and the terminal welding tool of the crimping type power module comprises: A plug-in pin carrier (1), the plug-in pin carrier (1) comprising a carrier body (11), the carrier body (11) being provided with at least one first mounting cavity (14); A welding jig (2), the welding jig (2) being arranged in the first installation cavity (14) to be plugged into a power terminal, the welding jig (2) comprising a jig body (21), at least one first high temperature resistant flexible material plate (24) being arranged on one side of the jig body (21), a first plug-in area being arranged on the first high temperature resistant flexible material plate (24), a second high temperature resistant flexible material plate (29) being arranged on the other side of the jig body (21) at a position corresponding to the first high temperature resistant flexible material plate (24), a second plug-in area being arranged on the second high temperature resistant flexible material plate (29) at a position corresponding to the first plug-in area, the first plug-in area and the second plug-in area correspondingly plugging into a power terminal; guide columns (25) being arranged around each of the first high temperature resistant flexible material plates (24), a flip-up compression spring (27) being arranged on a side of the guide column (25) close to the jig body (21), so that the module terminal welding assembly automatically generates downward pressure after being flipped over; A welding tool assembly platform (3), the welding tool assembly platform (3) comprising an assembly platform body (31), the assembly platform body (31) being provided with at least one second mounting cavity (34) matching the shape of a welding jig (2), and when the module substrate and the welding jig (2) are assembled, the welding jig (2) is arranged in the second mounting cavity (34), and the module substrate is stacked on one side of a first high temperature resistant flexible material plate (24) of the welding jig (2); A third installation cavity (16) is arranged in the first installation cavity (14), and step portions (15) are arranged on both sides of the third installation cavity (16), and the step portions (15) are extended along the width direction of the first installation cavity (14); An escape zone (23) is arranged around the jig body (21), an assembly column (22) is arranged on the escape zone (23), and a fixing plate (28) is arranged on a side of the second high temperature resistant flexible material plate (29) facing away from the jig body (21); The first pin region is provided with a plurality of first guide holes (26) arranged at intervals on a first high temperature resistant flexible material plate (24), and the second pin region is provided with a plurality of second guide holes (30) arranged at intervals on a second high temperature resistant flexible material plate (29), the number of the first guide holes (26) and the number of the second guide holes (30) being the same and corresponding one to one for plugging in power terminals; An L-shaped limiting member (32) is arranged around the second mounting cavity (34), a first limiting groove is formed on the inner periphery of the limiting member (32), a height limiting block (33) of matching shape is arranged on the inner periphery of the limiting member (32), and a second limiting groove (35) is formed on the inner wall of the limiting member (32) and the top surface of the height limiting block (33).

2. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: A carrier code plate installation groove (12) is provided on a side of the carrier body (11) close to the first installation cavity (14).

3. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: The third installation cavity (16) matches the shape of the second high temperature resistant flexible material plate (29), and the first installation cavity (14) on the step portion (15) matches the shape of the fixture body (21); a carrier reference point (13) is also provided on the carrier body (11).

4. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: The second high temperature resistant flexible material plate (29) and the fixing plate (28) are provided with fixing holes at positions corresponding to the guide posts (25), and the fixing holes are plug-fitted with the guide posts (25) provided corresponding thereto.

5. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: The module substrate comprises an AMB ceramic copper-clad liner, a welding sheet and a heat-dissipating copper substrate which are stacked and arranged. When the module substrate and the welding jig (2) are assembled, the heat-dissipating copper substrate is stacked and arranged on one side of a first high-temperature-resistant flexible material plate (24) of the welding jig (2); mounting holes are arranged around the heat-dissipating copper substrate at positions corresponding to the assembly columns (22), and the assembly columns (22) cooperate with the mounting holes arranged corresponding to them.

6. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: When the module substrate and the welding jig (2) are assembled, a second high-temperature-resistant flexible material plate (29) is arranged in the second installation cavity (34), and a jig body (21) of matching shape is arranged on the surrounding second limiting grooves (35).

7. The terminal welding tool for the crimping type power module according to claim 1, characterized in that: The height of the height limiting block (33) is greater than the length of the power terminal, and the height of the height limiting block (33) is less than the height of the limiting member (32).

8. A welding process using the terminal welding tool of the crimping type power module according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1. placing the second high temperature resistant flexible material plate (29) of the welding jig (2) in the third mounting cavity (16), and placing the jig body (21) in a shape-matched manner in the first mounting cavity (14) on the step portion (15), and then correspondingly plugging a plurality of power terminals into the first guide holes (26) and the second guide holes (30) of the welding jig (2), thereby completing the power terminal plugging; Step S2. The second high temperature resistant flexible material plate (29) of the welding jig (2) in which the power terminal is plugged in step S1 is placed in the second mounting cavity (34) of the welding tool assembly platform (3), and the jig body (21) is placed in the second limiting groove (35). The AMB ceramic copper-clad liner, the welding sheet and the heat dissipation copper substrate are then stacked and welded to obtain a module substrate. The heat dissipation copper substrate (5) is then stacked and arranged on one side of the first high temperature resistant flexible material plate (24) of the welding jig (2). Finally, the mounting hole of the heat dissipation copper substrate (5) is mounted corresponding to the assembly column (22) to obtain an assembled module terminal welding assembly. Step S3. Take the module terminal welding assembly out from the welding tool assembly platform (3), flip the module terminal welding assembly 180 degrees, and under the action of the inverted compression spring (27), the fixing plate (28) and the second high temperature resistant flexible material plate (29) press down the top of the power terminal; Step S4. Place the terminal welding assembly processed in step S3 into a welding equipment carrier for welding; Step S5. Take out the terminal welding assembly welded in step S4, and then separate the module with completed power terminal welding from the welding fixture to obtain a crimping type power module with welded power terminals.

9. The welding process according to claim 8, characterized in that: The welding parameters in step S4 are as follows: the heating rate in the welding heating stage is 1-3°C / s, when the temperature of the welding equipment cavity reaches 205-215°C, the welding equipment cavity is evacuated to <5mbar, and the welding equipment cavity begins to be filled with formic acid with a purity of ≥97% until the pressure reaches 550-650mbar, and then the oxide on the surface of the welding material is reduced, and the reduction treatment time is 60-90s; thereafter, the welding equipment continues to heat up to a maximum temperature that is 20-30°C higher than the melting point of the solder. After the welding reaches the maximum temperature, the welding equipment is evacuated to <10mbar to degas the welding layer, and the vacuum pressure is maintained for 60-90s during the degassing treatment, and then the pressure is released, and the pressure release rate is 40-60mbar / s. After the welding is completed, the temperature is lowered, and the cooling rate is 1-3°C / s.

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