Welding jig of power module

Abstract

The utility model relates to the technical field of welding jigs, in particular to a welding jig for a power module, which comprises a bearing plate, a power limiting plate, a first limiting plate and a second limiting plate, the bearing plate is used for bearing a to-be-welded bottom plate, a plurality of power plates for bearing the to-be-welded bottom plate, a power limiting plate, a first limiting plate and a second limiting plate, and the to-be-welded bottom plate is a bottom plate of a to-be-welded power semiconductor; the power limiting plate is used for limiting the placement positions of a plurality of power plates of the to-be-welded bottom plate on the bearing plate; the first limiting plate is mounted on the power limiting plate and is used for limiting a to-be-welded resistor and a to-be-welded pin of the power plate; the second limiting plate is installed on the first limiting plate and used for making contact with the to-be-welded pin and increasing the balance weight of the power plate so as to prevent welding holes from existing between the power plate and the to-be-welded bottom plate. The welding process and the welding process of the power module are simplified through the jig, the welding time is shortened, and the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding jigs, in particular to a welding jig for a power module. Background Art

[0002] Power module welding jigs are primarily used to secure and solder the various components of the power module, ensuring accuracy and efficiency. However, existing power module welding jigs typically perform secondary and tertiary welding separately. For example, a secondary welding jig is used to weld the DBC ceramic substrate to the base plate, and a tertiary welding jig is then used to solder the pins to the DBC surface. This results in a prolonged power module welding process, complicating the welding process, increasing welding time, and reducing welding efficiency. Utility Model Content

[0003] The embodiments of the present application provide a welding jig for a power module, thereby solving the technical problems in the prior art caused by the welding jig for the power module, such as prolonging the welding process of the power module, complicating the welding process, increasing the welding time, and reducing the welding efficiency. The embodiments of the present application achieve the technical effects of simplifying the welding process and welding process of the power module, reducing the welding time, and improving the welding efficiency.

[0004] In a first aspect, an embodiment of the present invention provides a welding fixture for a power module, comprising: a load plate, a power limit plate, a first limit plate, and a second limit plate that are sequentially matched and connected;

[0005] The supporting plate is used to support the base plate to be welded, the multiple power plates supporting the base plate to be welded, the power limiting plate, the first limiting plate and the second limiting plate, wherein the base plate to be welded is the base plate of the power semiconductor to be welded;

[0006] The power limiting plate is used to limit the placement positions of the multiple power plates of the base plate to be welded on the carrying plate;

[0007] The first limiting plate is mounted on the power limiting plate and is used to limit the resistors to be welded and the pins to be welded of the power plate;

[0008] The second limiting plate is mounted on the first limiting plate and is used to contact the pins to be welded and increase the weight of the power board to prevent welding voids from occurring between the power board and the base plate to be welded.

[0009] Preferably, the power limiting plate comprises: a limiting plate body, and a plurality of mounting holes provided on the limiting plate body, a position area corresponding to each power plate, and a mounting slot; and one mounting slot is provided on each position area;

[0010] The mounting hole is used to set the power limit plate on the bearing plate, the base plate to be welded and the power plate;

[0011] The installation slot is used to place the first limiting plate in the installation slot, so that the first limiting plate, the second limiting plate and the power board in the position area are arranged in a one-to-one correspondence.

[0012] Preferably, an anti-fouling protrusion is provided in each of the installation grooves, and the power limiting plate is made of graphite.

[0013] Preferably, the power limiting plate further comprises: an anti-fool hole provided on the limiting plate body; the anti-fool hole is matched and connected with the anti-fool column of the supporting plate.

[0014] Preferably, the first limiting plate includes: a first plate body, and a placement hole, a resistor limiting hole and a pin limiting hole provided on the first plate body;

[0015] The placement hole is used to install the second limiting plate on the first limiting plate through the placement hole;

[0016] The resistor limiting hole extends toward the carrier plate, and is used to embed the resistor to be welded, so that the resistor to be welded is welded to the power board through the resistor limiting hole;

[0017] The pin limiting hole is used to embed the pin to be welded, and the pin to be welded is welded to the power board through the pin limiting hole.

[0018] Preferably, the first limiting plate further includes: an anti-fool-proof concave portion provided on a side edge of the first plate body, the anti-fool-proof concave portion being matched and connected with the anti-fool-proof convex portion.

[0019] Preferably, the first limiting plate further includes: an observation through hole provided on the first plate body, and the observation through hole is provided corresponding to the power plate in the position area.

[0020] Preferably, the second limiting plate includes: a second plate body, and a placement protrusion and a taking hole provided on the second plate body;

[0021] The placement protrusions are arranged in a one-to-one correspondence with the placement holes, and the placement protrusions are matched and connected with the placement holes;

[0022] The taking hole is arranged corresponding to the observation through hole, and the taking hole is arranged corresponding to the power board in the position area.

[0023] Preferably, the supporting plate includes: a supporting plate body, and a fixing column and an anti-fool column arranged on the supporting plate body; the fixing column is first matched and connected with the top corner mounting holes of the base plate to be welded in a one-to-one correspondence, and the fixing column is then matched and connected with the mounting holes in a one-to-one correspondence, and the anti-fool column is matched and connected with the set anti-fool holes of the base plate to be welded and the anti-fool holes of the power limit plate in turn in a one-to-one correspondence to fix the base plate to be welded.

[0024] Preferably, the carrying plate comprises: at least two oppositely arranged taking and placing grooves, and the taking and placing grooves are arranged on the edge of the carrying plate body.

[0025] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0026] In an embodiment of the present invention, a welding fixture for a power module includes a supporting plate, a power limiting plate, a first limiting plate, and a second limiting plate, which are sequentially connected and matched. The supporting plate 100 supports the base plate to be welded, the power plate on the base plate to be welded, the power limiting plate, the first limiting plate, and the second limiting plate. The power limiting plate is used to limit the position of multiple power plates on the base plate to be welded on the supporting plate 100, so that a single power plate is confined to the position area of ​​a power plate on the power limiting plate, facilitating subsequent welding operations on the power plates.

[0027] Next, the resistors to be welded and the pins to be welded of the power board are limited by the first limiting plate installed on the power limiting plate, so as to integrate the operation of welding the power board and the base plate to be welded together in the secondary welding process, and the operation of welding the pin-type resistors and pins to the surface of the power board in the tertiary welding process, and realize the operation of welding the power board and the base plate to be welded together and the operation of welding the pin-type resistors and pins to the surface of the power board at the same time. In this way, the welding process and welding process of the power module are simplified, the welding time is shortened, and the welding efficiency is improved. Then, the second limiting plate installed on the first limiting plate is used to contact the pins to be welded and increase the counterweight of the power board to prevent the presence of welding voids between the power board and the base plate to be welded, which affects the welding effect. This can further improve the reliability and stability of the welding process of the power module and improve the qualified rate of the finished welding products of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference figures denote the same components. In the accompanying drawings:

[0029] Figure 1A schematic structural diagram of a welding jig for a power module in an embodiment of the present utility model is shown;

[0030] Figure 2 Another structural schematic diagram of a welding jig for a power module in an embodiment of the present utility model is shown;

[0031] Figure 3 A schematic structural diagram of a carrier plate in an embodiment of the present utility model is shown;

[0032] Figure 4 A schematic structural diagram of a power limiting plate in an embodiment of the present utility model is shown;

[0033] Figure 5 A schematic structural diagram of a first limiting plate in an embodiment of the present utility model is shown;

[0034] Figure 6 A schematic diagram of the connection structure between the first limiting plate and the pin installer in an embodiment of the present utility model is shown;

[0035] Figure 7 A schematic structural diagram of the second limiting plate in an embodiment of the present utility model is shown.

[0036] In the accompanying drawings, 100, a carrier plate; 200, a power limiting plate; 300, a first limiting plate; 400, a second limiting plate; 500, a base plate to be welded; 600, a power board; 700, a pin installer; 701, a pin;

[0037] 101, load-bearing plate; 102, fixed column; 103, foolproof column; 104, pick-and-place slot; 1021, first boss; 1022, second boss;

[0038] 201, limit plate; 202, mounting hole; 203, position area; 204, mounting groove; 205, foolproof protrusion; 206, foolproof hole;

[0039] 301, first plate; 302, placement hole; 303, resistor limit hole; 304, pin limit hole; 305, foolproof recess; 306, observation hole;

[0040] 401. Second plate; 402. Placement protrusion; 403. Removal hole. DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] Example 1

[0043] The first embodiment of the present invention provides a welding fixture for a power module, such as Figure 1 As shown, it includes: a carrier plate 100, a power limiting plate 200, a first limiting plate 300 and a second limiting plate 400 that are matched and connected in sequence. The carrier plate 100 is used to support the base plate 500 to be welded, multiple power plates 600 supporting the base plate 500 to be welded, the power limiting plate 200, the first limiting plate 300 and the second limiting plate 400, and the base plate 500 to be welded is the base plate of the power semiconductor to be welded. The power limiting plate 200 is used to limit the placement position of the multiple power plates 600 of the base plate 500 to be welded on the carrier plate 100. The first limiting plate 300 is installed on the power limiting plate 200 and is used to limit the resistors to be welded and the pins to be welded on the power plate 600. The second limiting plate 400 is installed on the first limiting plate 300 and is used to contact the pins to be welded and increase the counterweight of the power plate 600 to prevent welding voids between the power plate 600 and the base plate 500 to be welded.

[0044] like Figure 1 As shown, the arrangement structure of the supporting plate 100, the power limiting plate 200, the first limiting plate 300 and the second limiting plate 400 that are matched and connected in sequence is that the power limiting plate 200 is arranged on the supporting plate 100, the first limiting plate 300 is arranged on the power limiting plate 200, and the second limiting plate 400 is arranged on the first limiting plate 300. Figure 2As shown, in this way, the carrier plate 100, the power limiting plate 200, the first limiting plate 300 and the second limiting plate 400 are matched and connected to form a whole, which is used to fix and weld the base plate 500 to be welded and the power plate 600. Among them, the power plate 600 is located on the base plate 500 to be welded, and the power limiting plate 200 is located on the power plate 600 of the base plate 500 to be welded. The welding jig of the power module of this embodiment can be used in various welding applications of power modules. Compared with the secondary welding (the process of welding the power plate to the base plate) and the tertiary welding (the process of welding the pins / pins to the power plate after the secondary welding) of the traditional power module, the present invention integrates the secondary welding and tertiary welding of the power module, especially the IGBT power module of the HPD package type, which can greatly save process flow and steps and save costs. For example, the power plate 600 after welding the chip is welded to the heat sink, and the resistor to be welded is welded to the power plate 600. The heat sink here is the base plate 500 to be welded. The resistors to be welded include thermistors and / or current-sensing resistors for checking current. The number of power boards 600 can be set according to actual needs. This embodiment uses three power boards 600 as an example to illustrate the structure of the power module welding jig. The structure of the power module welding jig illustrated using three power boards 600 as an example can be expanded to a power module welding jig structure with multiple power boards 600.

[0045] The power board 600 provided by the present invention includes but is not limited to: a thin film ceramic substrate (TFC), a thick film printed ceramic substrate (TPC), an active metal brazing ceramic substrate (AMB), a direct plated copper ceramic substrate (DPC) and a laser activated metallization ceramic substrate (LAM). The power board 600 also includes: other flat ceramic substrates such as an aluminum substrate, a high / low temperature co-fired ceramic substrate (HTCC / LTCC), a multilayer sintering ceramic substrate (MSC), a direct adhesive ceramic substrate (DAC), a multilayer plated copper ceramic substrate (MPC) and a direct molding ceramic substrate (DMC). Substrate, DMC) and other power substrates / substrates.

[0046] In this embodiment, the welding fixture of the power module includes a carrier plate 100, a power limiting plate 200, a first limiting plate 300, and a second limiting plate 400, which are matched and connected in sequence. The carrier plate 100 supports the base plate 500 to be welded, the power plate 600 on the base plate 500 to be welded, the power limiting plate 200, the first limiting plate 300, and the second limiting plate 400. The power limiting plate 200 is used to limit the multiple power plates 600 of the base plate 500 to be welded on the carrier plate 100, so that a single power plate 600 is confined to the position area 203 of a power plate 600 in the power limiting plate 200, which facilitates the subsequent welding operation of the power plate 600.

[0047] By means of the first limiting plate 300 installed on the power limiting plate 200, the resistors to be welded and the pins to be welded of the power plate 600 are limited, so as to integrate the operation of welding the power plate 600 and the base plate 500 to be welded together in the secondary welding process, and the operation of welding the pin-type resistors and pins to the surface of the power plate 600 in the tertiary welding process, and realize the operation of welding the power plate 600 and the base plate 500 to be welded together and the operation of welding the pin-type resistors and pins to the surface of the power plate 600 at the same time. In this way, the welding process and welding process of the power module are simplified, the welding time is shortened, and the welding efficiency is improved. Then, by means of the second limiting plate 400 installed on the first limiting plate 300, the pins to be welded are contacted and the counterweight of the power plate 600 is increased to prevent the presence of welding voids between the power plate 600 and the base plate 500 to be welded, thereby affecting the welding effect. In this way, the reliability and stability of the welding process of the power module can be further improved and reduced, and the qualified rate of the finished welding products of the power module can be improved.

[0048] Next, combine Figure 1 and Figure 2 The specific structure of the welding fixture of the power module of this embodiment is described in detail:

[0049] like Figure 3 As shown, the carrier plate 100 includes: a carrier plate body 101 and a fixing column 102 and an anti-fool column 103 arranged on the carrier plate body 101. The fixing column 102 is first matched and connected with the top corner mounting hole of the base plate 500 to be welded in a one-to-one correspondence, and the fixing column 102 is then matched and connected with the mounting hole 202 of the power limiting plate 200 in a one-to-one correspondence. The anti-fool column 103 is matched and connected with the set anti-fool hole of the base plate 500 to be welded and the anti-fool hole 206 of the power limiting plate 200 in a one-to-one correspondence in turn. In this way, the base plate 500 to be welded can be fixed, and the power limiting plate 200 can be stably set on the carrier plate 100, the base plate 500 to be welded and the power plate 600. Specifically, a fixing column 102 is first matched and connected with the top corner mounting hole of a base plate 500 to be welded, and then matched and connected with the mounting hole 202 of the power limiting plate 200. A foolproof post 103 is first connected to a predetermined foolproof hole of the base plate 500 to be welded, and then connected to a foolproof hole 206 of the power limiter plate 200. The number and position of the fixing posts 102 of the carrier plate 100 and the number and position of the mounting holes 202 of the power limiter plate 200 are determined based on the number and position of the top corner mounting holes of the base plate 500 to be welded, and can also be set according to actual needs. The number and position of the foolproof posts 103 and the number and position of the foolproof holes 206 of the power limiter plate 200 are determined based on the number and position of the predetermined foolproof holes of the base plate 500 to be welded, and can also be set according to actual needs.

[0050] Each fixed column 102 and each fool-proof column 103 includes: a first boss 1021 and a second boss 1022, the second boss 1022 is arranged on the first boss 1021, and the diameter of the second boss 1022 is not greater than the diameter of the first boss 1021. The first boss 1021 is used to match and connect with the top corner mounting hole of the base plate 500 to be welded, so that the first boss 1021 is located in the top corner mounting hole. The second boss 1022 is used to sequentially penetrate the top corner mounting hole of the base plate 500 to be welded and the mounting hole 202 of the power limit plate 200, or sequentially penetrate the set fool-proof hole of the base plate 500 to be welded and the fool-proof hole 206 of the power limit plate 200. The specific structures of the fool-proof column 103 and the fixed column 102 can be consistent or inconsistent, and their respective column structures can also be set according to actual needs.

[0051] This allows the base plate 500 to be stably fixed on the carrier plate 100, and the power limiting plate 200 to be stably set on the carrier plate 100 and the base plate 500 to be welded, thereby preventing the power plate 600 and the base plate 500 to be welded from shifting. It also facilitates welding the power plate 600 to the base plate 500 to be welded, improving the welding reliability and stability of the power module and increasing the qualified rate of the power module product. In addition, the setting of the anti-fool column 103 is an anti-fool setting for the carrier plate 100 and the base plate 500 to be welded. By setting the anti-fool column 103, the base plate 500 to be welded is prevented from being placed upside down, and production defects caused by the jig being placed upside down are avoided, thereby simplifying the welding process and welding process of the power module, reducing welding time, and improving welding efficiency.

[0052] The carrier plate 100 further includes at least two oppositely disposed access slots 104 disposed on the edges of the carrier plate body 101. The access slots 104 are used to install and remove the first limiting plate 300 and the base plate 500 to be welded, thereby improving the convenience of installing the welding jig.

[0053] The carrier plate 100 will play a bearing role, so there are requirements for the hardness of the carrier plate 100. The material of the carrier plate 100 is an alloy material or other high-temperature resistant material. For example, graphite, steel. The alloy material is selected for the carrier plate 100 to make the power module welding fixture durable and heat-conducting, and the production cost is low. In addition, the design of the carrier plate 100 can be set according to actual needs, for example Figure 3 The supporting plate body 101 of the supporting plate 100 shown is a plate body having a supporting plate body through hole.

[0054] like Figure 4 As shown, the power limiting plate 200 includes: a limiting plate body 201, a plurality of mounting holes 202 provided on the limiting plate body 201, a position area 203 corresponding to each power board 600, and a mounting slot 204. Each position area 203 is provided with a mounting slot 204.

[0055] Mounting holes 202, extending through the fixing posts 102 of the carrier plate 100, are used to position the power limiting plate 200 on the carrier plate 100, the base plate 500 to be welded, and the power board 600. This limits the placement of the power board 600 so that the placement of each power board 600 corresponds to the position area 203 of the limiting plate body 201. This ensures the stability and reliability of the power board 600 during welding, improves the welding reliability and stability of the power module, reduces wear on the power module and welding jig, increases the service life of the power module welding jig, increases the qualified rate of power module products, and reduces production costs.

[0056] The mounting groove 204 is used to place the first limiting plate 300 in the mounting groove 204, so that the first limiting plate 300, the second limiting plate 400 and the power plate 600 in the position area 203 are arranged in a one-to-one correspondence. In this way, the first limiting plate 300 is limited by the mounting groove 204, so that the first limiting plate 300 is aligned with the position area 203 corresponding to the power plate 600 in the limiting plate body 201, and the power plate 600 is efficiently welded. In this way, the welding reliability and stability of the power module are improved, the wear of the power module and the welding jig is reduced, the service life of the welding jig of the power module is increased, the qualified rate of the power module product is increased, and the production cost is reduced. It should also be noted that the middle area of ​​the mounting groove 204 area is presented as a through hole, which is convenient for observing the welding condition of the base plate 500 to be welded and the power base plate during the welding process.

[0057] exist Figure 4 In the embodiment, the limiting plate body 201 is provided with three positional areas 203 corresponding to the power boards 600, and a mounting slot 204 is provided in each positional area 203, i.e., three mounting slots 204. Each mounting slot 204 corresponds to a first limiting plate 300, so that the first limiting plates 300 are provided in a one-to-one correspondence with the power boards 600 in the positional areas 203. A second limiting plate 400 is provided above each first limiting plate 300, and the first limiting plates 300 and the second limiting plates 400 are also provided in a one-to-one correspondence, thereby ensuring a one-to-one correspondence between the first limiting plates 300, the second limiting plates 400, and the power boards 600 in the positional areas 203.

[0058] Each mounting slot 204 is provided with a foolproof protrusion 205. This foolproof protrusion 205 serves as a foolproof measure for the power limiting plate 200 and the first limiting plate 300. This prevents the power limiting plate 200 and the first limiting plate 300 from being placed upside down, thus avoiding production defects caused by the jig being placed upside down. This simplifies the power module welding process, reduces welding time, and improves welding efficiency, achieving a foolproof jig.

[0059] The material of the power limiting plate 200 is graphite. In the process of spacing the power plate 600 through the position area 203 of the power limiting plate 200, no damage such as wear and tear will be caused to the ceramic layer of the power plate 600. The power limiting plate 200 also includes: an anti-fool hole 206 set on the limiting plate body 201. The anti-fool hole 206 is matched and connected with the anti-fool column 103 of the carrier plate 100. The anti-fool hole 206 is an anti-fool measure for the power limiting plate 200 and the first limiting plate 300. Through the setting of the anti-fool hole 206, the power limiting plate 200 and the first limiting plate 300 are prevented from being placed upside down, and production defects caused by the jig being placed upside down are avoided, thereby simplifying the welding process and welding process of the power module, reducing the welding time, improving the welding efficiency, and achieving the effect of anti-fool of the jig.

[0060] like Figure 5 As shown, the first limiting plate 300 includes: a first plate body 301 , and a placement hole 302 , a resistor limiting hole 303 and a pin limiting hole 304 provided on the first plate body 301 .

[0061] The placement hole 302 is used to install the second limiting plate 400 on the first limiting plate 300 through the placement hole 302. Specifically, Figure 5 As shown, the placement holes 302 are located at the four top corners of the first plate body 301, and are matched and connected with the placement protrusions of the second limiting plate 400, so that the second limiting plate 400 is stably set on the first limiting plate 300, which facilitates the welding of the resistors to be welded and the pins to be welded, improves the reliability and stability of the welding process, and promotes the yield of the power module.

[0062] The resistor limiting hole 303 extends toward the carrier board 100 and is used to embed the resistor to be welded and weld the resistor to be welded on the power board 600 through the resistor limiting hole 303. Specifically, the position of the resistor limiting hole 303 is determined according to the welding position of the resistor to be welded on the power board 600. Figure 5 In the example shown, resistor stop holes 303 are located near the corners of first stop plate 300 and extend downward to the power board 600 to be soldered. The resistor to be soldered is placed within resistor stop holes 303 and soldered to power board 600 through resistor stop holes 303. Therefore, the provision of resistor stop holes 303 prevents the circular resistor from shifting due to melting solder during the soldering process, ensuring a satisfactory resistor soldering rate and further improving the soldering reliability and stability of the power module.

[0063] Pin retaining holes 304 are used to insert the pins to be soldered, allowing them to be soldered to the power board 600 through the pin retaining holes 304. Specifically, the position of pin retaining holes 304 is determined based on the soldering position of the pins to be soldered on the power board 600. The pins to be soldered are placed within pin retaining holes 304 and then soldered to the power board 600 through the pin retaining holes 304. Therefore, the provision of pin retaining holes 304 ensures that the pins to be soldered can be quickly, directly, and efficiently soldered to the power board 600, ensuring the qualified rate of resistance welding and further improving the soldering reliability and stability of the power module.

[0064] The shape of the first plate body 301 is determined according to the mounting groove 204. The first limiting plate 300 also includes: an anti-foolproofing recess 305 provided on a side edge of the first plate body 301. The anti-foolproofing recess 305 is matched and connected with the anti-foolproofing protrusion 205. The anti-foolproofing recess 305 is an anti-foolproofing measure for the power limiting plate 200 and the first limiting plate 300. By setting the anti-foolproofing recess 305, the power limiting plate 200 and the first limiting plate 300 are prevented from being placed upside down, and production defects caused by the jig being placed upside down are avoided, thereby simplifying the welding process and welding process of the power module, reducing the welding time, improving the welding efficiency, and achieving the anti-foolproofing effect of the jig. In addition, due to the setting of the anti-foolproofing recess 305, the shape of the edge of the first plate body 301 where the anti-foolproofing recess 305 is located is inconsistent with the shape of the edge corresponding to the anti-foolproofing recess 305, which plays an anti-foolproofing role for the jig.

[0065] The first limiting plate 300 further includes an observation hole 306 disposed on the first plate body 301. The observation hole 306 is provided corresponding to the power board 600 in the positioning area 203. Specifically, the line of sight passes through the observation hole 306 and the through hole in the positioning area 203 to reach the base plate 500 and the power board 600 to be welded, facilitating observation of the welding process of the base plate 500 and the power board 600, thereby improving the stability and reliability of the welding process and increasing the yield rate.

[0066] It should also be noted that the material of the first plate 301 is preferably an alloy material. Since the processing of the first limit plate 300 is relatively complex, the use of an alloy material is easy to ensure processing accuracy. The process of embedding the resistor to be welded and the pin to be welded into the first limit plate 300 is that the pin to be welded adopts a pin-shaped pin. Figure 6As shown, first assemble the first limiting plate 300 and the pin installer 700 together through the placement hole 302 of the first limiting plate 300, and then insert the pin-type pin to be welded into the pin limiting hole (the pin limiting hole is the pin limiting hole 304) of the first limiting plate 300. The crown spring in the pin installer 700 clamps the pin 701 (the pin 701 is the pin to be welded). Assemble the first limiting plate 300 and the pin installer 700 into the mounting groove 204 of the power limiting plate 200. At this time, remove the pin installer 700, and the pin 701 remains in the pin limiting hole in the first limiting plate 300. The resistor to be welded is directly assembled in the resistor limiting hole 303 of the first limiting plate 300 on the power limiting plate 200. In this way, the assembly operation of the pins to be welded can be quickly and accurately realized, so that the resistor to be welded can be welded to the power board 600 through the resistor limiting hole 303 of the first limiting plate 300, and the pins to be welded can be welded to the power board 600 through the pin limiting hole 304 of the first limiting plate 300, thereby ensuring the reliability and stability of the welding process.

[0067] like Figure 7 As shown, the second limiting plate 400 includes: a second plate body 401, and a placement protrusion 402 and a take-out hole 403 provided on the second plate body 401. The second plate body 401 is in contact with the resistor to be welded and the pin to be welded. The material of the second plate body 401 can be an alloy material.

[0068] The placement protrusions 402 are arranged in a one-to-one correspondence with the placement holes 302, and the placement protrusions 402 are matingly connected to the placement holes 302. Specifically, the placement protrusions 402 are arranged on the surface of the second plate 401 facing the first limiting plate 300, and the placement protrusions 402 extend toward the first limiting plate 300. This allows the placement protrusions 402 to be inserted into the placement holes 302, achieving a mating connection between the placement protrusions 402 and the placement holes 302, thereby ensuring that the second limiting plate 400 can be stably positioned on the first limiting plate 300.

[0069] The access hole 403 is provided in correspondence with the observation through hole 306, and the access hole 403 is provided in correspondence with the power board 600 in the position area 203. Specifically, the access hole 403 is used to take and place the second limit plate 400, and the welding condition can also be observed through the access hole 403. Specifically, the shape and number of the access hole 403 can be set according to actual needs, such as Figure 7The three second limiting plates 400 shown have two access holes 403 in the second plate body 401 of each second limiting plate 400, and each access hole 403 is elliptical. A second limiting plate 400 and its two access holes 403 are correspondingly arranged on the position area 203 in the limiting plate body 201 and on the first limiting plate 300 in the position area 203. The line of sight passes through the access holes 403, the observation through-hole 306, and the through-hole in the position area 203 in sequence to reach the base plate 500 to be welded and the power board 600, making it easy to observe the welding conditions of the base plate 500 to be welded and the power board 600, improving the stability and reliability of the welding process and increasing the yield rate.

[0070] The second limiting plate 400 is mounted on the first limiting plate 300. This allows the second limiting plate 400 to directly contact the resistors and pins to be soldered. Its weight acts as a counterweight when the power board 600 is soldered to the base plate 500. This also reduces solder voids between the power board 600 and the base plate 500, further improving power module reliability and production yield, reducing both acceptable and unacceptable rates, and saving costs.

[0071] It should be understood by those skilled in the art that although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0072] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A welding jig for a power module, characterized in that: include: The supporting plate, the power limiting plate, the first limiting plate and the second limiting plate are matched and connected in sequence; The supporting plate is used to support the base plate to be welded, the multiple power plates supporting the base plate to be welded, the power limiting plate, the first limiting plate and the second limiting plate, wherein the base plate to be welded is the base plate of the power semiconductor to be welded; The power limiting plate is used to limit the placement positions of the multiple power plates of the base plate to be welded on the carrying plate; The first limiting plate is mounted on the power limiting plate and is used to limit the resistors to be welded and the pins to be welded of the power plate; The second limiting plate is mounted on the first limiting plate and is used to contact the pins to be welded and increase the weight of the power board to prevent welding voids from occurring between the power board and the base plate to be welded.

2. The welding jig for a power module according to claim 1, wherein: The power limiting plate includes: a limiting plate body, and a plurality of mounting holes provided on the limiting plate body, a position area corresponding to each power plate, and a mounting slot; each position area is provided with a mounting slot; The mounting hole is used to set the power limit plate on the bearing plate, the base plate to be welded and the power plate; The installation slot is used to place the first limiting plate in the installation slot, so that the first limiting plate, the second limiting plate and the power board in the position area are arranged in a one-to-one correspondence.

3. The welding jig for a power module according to claim 2, wherein: An anti-fouling convex portion is provided in each of the installation grooves, and the material of the power limiting plate is graphite.

4. The welding jig for a power module according to claim 3, wherein: The power limiting plate further comprises: an anti-fool hole provided on the limiting plate body; the anti-fool hole is matched and connected with the anti-fool column of the supporting plate.

5. The welding jig for a power module according to claim 4, wherein: The first limiting plate includes: a first plate body, and a placement hole, a resistor limiting hole and a pin limiting hole provided on the first plate body; The placement hole is used to install the second limiting plate on the first limiting plate through the placement hole; The resistor limiting hole extends toward the carrier plate, and is used to embed the resistor to be welded, so that the resistor to be welded is welded to the power board through the resistor limiting hole; The pin limiting hole is used to embed the pin to be welded, and the pin to be welded is welded to the power board through the pin limiting hole.

6. The welding jig for a power module according to claim 5, wherein: The first limiting plate further includes: an anti-fouling concave portion provided on a side edge of the first plate body, the anti-fouling concave portion being matched and connected with the anti-fouling convex portion.

7. The welding jig for a power module according to claim 5, wherein: The first limiting plate further includes: an observation through hole provided on the first plate body, wherein the observation through hole is provided corresponding to the power board in the position area.

8. The welding jig for a power module according to claim 7, wherein: The second limiting plate includes: a second plate body, and a placement protrusion and a taking hole provided on the second plate body; The placement protrusions are arranged in a one-to-one correspondence with the placement holes, and the placement protrusions are matched and connected with the placement holes; The taking hole is arranged corresponding to the observation through hole, and the taking hole is arranged corresponding to the power board in the position area.

9. The welding jig for a power module according to any one of claims 1 to 8, wherein: The supporting plate includes: a supporting plate body, and a fixing column and an anti-fool column arranged on the supporting plate body; the fixing column is first matched and connected with the top corner mounting holes of the base plate to be welded in a one-to-one correspondence, and the fixing column is then matched and connected with the mounting holes in a one-to-one correspondence, and the anti-fool column is matched and connected with the set anti-fool holes of the base plate to be welded and the anti-fool holes of the power limit plate in turn in a one-to-one correspondence to fix the base plate to be welded.

10. The welding jig for a power module according to claim 9, wherein: The carrying plate comprises: at least two oppositely arranged taking and placing grooves, and the taking and placing grooves are arranged on the edge of the carrying plate body.

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