Power module welding jig

Abstract

The utility model relates to the technical field of power module welding jigs, in particular to a power module welding jig which comprises a bearing plate, a first limiting plate and a second limiting plate which are sequentially connected in a matched mode. The bearing plate is used for bearing a to-be-welded bottom plate, the first limiting plate and the second limiting plate; the first limiting plate is used for limiting the placement position of a power board of a to-be-welded bottom plate on the bearing plate; the second limiting plate is used for being installed on the first limiting plate and limiting a to-be-welded resistor of the power board. The first limiting plate comprises a first plate body and a limiting strip, the limiting strip is arranged in the first plate body, the power plate is separated and limited through the limiting strip, the placement position of the power plate in the first plate body is separated, and the power plate is placed in the corresponding placement position in the first plate body. The welding reliability and stability of the power module are improved through the jig, and the qualified rate of the high-power module product is increased.

Description

Technical Field

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

[0002] Based on the existing welding jig of the IGBT power module, during the process of welding the DBC (Direct Bonded Copper Ceramic Substrate) ceramic substrate to the heat sink base plate, usually only the two ends of the DBC ceramic substrate are fixed. This causes the DBC ceramic substrate to shift during high-temperature vacuum reflow soldering, and then the solder of adjacent DBC ceramic substrates sticks together, causing the performance of the power module to fail, leading to the problem of low welding reliability of the power module caused by the welding jig of the power module. At the same time, under high temperature conditions, the solder of the thermistor and / or current sensing resistor of the power module is easily melted, causing the thermistor and / or current sensing resistor to deform, especially the cylindrical thermistor and / or current sensing resistor will move when the DBC ceramic substrate is welded to the base plate. Therefore, the power module has the problem of low welding reliability caused by the welding jig, which increases the failure rate of the power module products and wastes production costs. Utility Model Content

[0003] The embodiment of the present application solves the technical problem of low welding reliability of power modules caused by welding jigs in the prior art by providing a power module welding jig, thereby achieving technical effects such as improving the welding reliability and stability of the power module, reducing the wear of the power module and the welding jig, increasing the service life of the power module welding jig, increasing the qualified rate of power module products, and reducing production costs.

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

[0005] The supporting plate is used to support the base plate to be welded, 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 first limiting plate is used to limit the placement positions of the multiple power boards of the base plate to be welded on the carrying plate;

[0007] The second limiting plate is used to be mounted on the first limiting plate to limit the resistor to be welded on the power board;

[0008] Among them, the first limiting plate includes: a first plate body and a limiting bar, and the limiting bar is set in the first plate body to separate and limit the multiple power boards through the limiting bar, and separate the placement positions of the power boards in the first plate body, so that the power boards are placed in the corresponding placement positions in the first plate body.

[0009] Optionally, each of the two ends of the limiting strip is provided with a horizontal protrusion and a vertical protrusion;

[0010] The first limiting plate further includes: at least one mounting slot group, the mounting slot group being provided on the first plate body, each mounting slot group including two correspondingly provided mounting slots; the limiting strip being provided in the mounting slot group, and the ends of the limiting strip being matched and connected with the mounting slots of the mounting slot group in a one-to-one correspondence;

[0011] One end of the limit bar is matched and connected to the installation slot, the horizontal protrusion is clamped on the top of the installation slot, the vertical protrusion passes through the installation slot and is bent and connected to the bottom of the installation slot, and the vertical protrusion is in contact with the first plate.

[0012] Optionally, the number of the limiting bars arranged in the installation slot group is two.

[0013] Optionally, the first plate is made of graphite, and the limiting strip is made of an alloy.

[0014] Optionally, the first limiting plate further comprises: a plurality of mounting holes and a plurality of limiting plate placement slot groups, wherein the mounting holes are provided on the first plate body, one limiting plate placement slot group is correspondingly provided at a placement position of one of the power boards in the first plate body, and each limiting plate placement slot group comprises two correspondingly provided limiting plate placement slots;

[0015] The mounting hole is used to set the first limiting plate on the bearing plate and the base plate to be welded;

[0016] The limiting plate placement slot group is used to place the second limiting plate in the limiting plate placement slot group, so that the second limiting plate is arranged in a one-to-one correspondence with the placement position of the power board in the first plate body.

[0017] Optionally, the supporting plate includes: a supporting plate body and a plurality of fixing columns provided on the supporting plate body; the fixing columns are 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 columns are then matched and connected with the mounting holes of the first limiting plate in a one-to-one correspondence to fix the base plate to be welded;

[0018] Each of the fixing columns includes: a first boss and a second boss, wherein the second boss is disposed on the first boss, and a diameter of the second boss is not greater than a diameter of the first boss;

[0019] The first boss is used to match and connect with the top corner mounting hole of the base plate to be welded;

[0020] The second boss is used to sequentially penetrate the top corner mounting hole of the base plate to be welded and the mounting hole of the first limiting plate.

[0021] Optionally, the carrying plate includes: at least two oppositely arranged pick-up and placement grooves, and the pick-up and placement grooves are arranged on the edges of the carrying plate body.

[0022] Optionally, the second limiting plate includes: a second plate body, a taking hole and a mounting protrusion;

[0023] The taking hole is provided in the second plate body, and the taking hole is provided corresponding to the placement position of the power board;

[0024] The mounting protrusion is matched and connected with the limiting plate placement groove of the first limiting plate.

[0025] Optionally, the second limiting plate includes: a resistor limiting hole; the resistor limiting hole is arranged on the second plate body, and the resistor limiting hole extends toward the supporting plate, so that the resistor to be welded is welded to the power board through the resistor limiting hole.

[0026] Optionally, the second limiting plate includes: a counterweight protrusion, which is arranged on the plate surface of the second plate body facing the supporting plate, and the counterweight protrusion extends toward the supporting plate and is in pressure contact with the power plate to increase the counterweight of the power plate.

[0027] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0028] In an embodiment of the present invention, a power module welding jig includes a supporting plate, a first limiting plate, and a second limiting plate, which are sequentially connected and matched. The supporting plate supports the base plate to be welded, the first limiting plate, and the second limiting plate. The first limiting plate limits the position of multiple power boards on the base plate to be welded on the supporting plate, so that a single power board is confined to the position of a power board in the first limiting plate, facilitating subsequent welding operations on the power boards.

[0029] Among them, the first limiting plate includes: a first plate body and a limiting bar. The limiting bar is arranged in the first plate body. The multiple power boards on the carrier plate are separated and limited by the limiting bar. And the placement positions of the power boards in the first plate body are separated by the limiting bar, and the spatial positions in the first plate body are separated into placement positions of individual power boards, so that each power board is placed in a corresponding placement position in the first plate body. In this way, during the welding process of the power board, the solder is prevented from flowing and sticking after being melted by high temperature, and the soldering of adjacent power boards is prevented from sticking together, thereby improving the reliability and stability of the power module during the welding process, reducing the wear of the power module and the welding jig, and improving the qualified rate of the power module products.

[0030] Furthermore, by installing the second limiting plate on the first limiting plate, the resistors to be soldered to the power board are limited in position, allowing them to be soldered efficiently and reliably to the power board. This prevents the resistors from shifting due to melting solder during the soldering process, further improving the reliability and stability of the power module soldering process, reducing wear on the power module and soldering jig, increasing the qualified rate of power module products, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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:

[0032] Figure 1 A schematic structural diagram of a power module welding jig in an embodiment of the present utility model is shown;

[0033] Figure 2 Another structural schematic diagram of a power module welding jig in an embodiment of the present utility model is shown;

[0034] Figure 3 A schematic structural diagram of a carrier plate in an embodiment of the present utility model is shown;

[0035] Figure 4 A schematic structural diagram of a first limiting plate in an embodiment of the present utility model is shown;

[0036] Figure 5 A schematic structural diagram of a limit bar in an embodiment of the present utility model is shown;

[0037] Figure 6 It shows a schematic structural diagram of the embodiment of the present utility model in which the limit bar is arranged behind the installation slot group;

[0038] Figure 7It shows a schematic structural diagram of the matching connection between the limiting strip and the installation groove in an embodiment of the present utility model;

[0039] Figure 8 A schematic structural diagram of the second limiting plate in an embodiment of the present utility model is shown.

[0040] In the accompanying drawings, 100 is a carrier plate; 200 is a first limiting plate; 300 is a second limiting plate; 400 is a bottom plate to be welded; 500 is a power board;

[0041] 101, bearing plate; 102, fixing column; 1021, first boss; 1022, second boss; 103, pick-and-place slot;

[0042] 201, first plate; 202, limit strip; 203, mounting slot; 204, mounting hole; 205, limit plate placement slot; 2021, horizontal protrusion; 2022, vertical protrusion;

[0043] 301. Second plate; 302. Removal hole; 303. Mounting protrusion; 304. Resistor limit hole; 305. Counterweight protrusion. DETAILED DESCRIPTION

[0044] 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.

[0045] Example 1

[0046] The first embodiment of the present invention provides a power module welding fixture, such as Figure 1 As shown, the system comprises: a supporting plate 100, a first limiting plate 200, and a second limiting plate 300, which are sequentially connected and matched. The supporting plate 100 is used to support the base plate 400 to be welded, the first limiting plate 200, and the second limiting plate 300. The base plate 400 to be welded is the base plate of the power semiconductor to be welded. The first limiting plate 200 is used to limit the placement of multiple power boards 500 on the base plate 400 to be welded on the supporting plate 100. The second limiting plate 300 is used to be installed on the first limiting plate 200 to limit the position of the resistors to be welded on the power boards 500. Among them, the first limiting plate 200 includes: a first plate body 201 and a limiting bar 202, and the limiting bar 202 is set in the first plate body 201 to separate and limit multiple power panels 500 through the limiting bar 202, and separate the placement positions of the power panels 500 in the first plate body 201, so that the power panels 500 are placed in the corresponding placement positions in the first plate body 201.

[0047] It should be noted that if Figure 1 As shown, the arrangement structure of the supporting plate 100, the first limiting plate 200 and the second limiting plate 300 connected in sequence is that the first limiting plate 200 is arranged on the supporting plate 100, and the second limiting plate 300 is arranged on the first limiting plate 200. Figure 2 As shown, in this way, the carrier plate 100, the first limiting plate 200 and the second limiting plate 300 are matched and connected to form a whole, which is used to fix and weld the base plate 400 to be welded. Among them, the power plate 500 is located on the base plate 400 to be welded, and the first limiting plate 200 is located above the power plate 500 of the base plate 400 to be welded. The power module welding jig of this embodiment can be used in various welding applications of power modules, especially in secondary welding applications for IGBT power modules of ME4 package type. For example, the power plate after welding the chip is welded to the heat sink, and the resistor to be welded is welded to the power plate. The heat sink here is the base plate 400 to be welded. The resistor to be welded includes a thermistor and / or a current detection resistor for checking the current. The number of power plates 500 can be set according to actual needs. This embodiment takes two power plates 500 as an example to illustrate the structure of the power module welding jig. The structure of the power module welding jig illustrated based on two power plates 500 as an example can be expanded to the structure of a power module welding jig with multiple power plates 500.

[0048] The power board provided in this embodiment includes planar ceramic substrates such as thin film ceramic substrate (TFC), thick film printed ceramic substrate (TPC), active metal brazing ceramic substrate (AMB), direct plated copper ceramic substrate (DPC), and laser activated metallization ceramic substrate (LAM). It may also include power substrates / base plates such as aluminum substrate, high / low temperature co-fired ceramic substrate (HTCC / LTCC), multilayer sintering ceramic substrate (MSC), direct adhesive ceramic substrate (DAC), multilayer plated copper ceramic substrate (MPC), and direct molding ceramic substrate (DMC).

[0049] In this embodiment, the power module welding jig includes a carrier plate 100, a first limiting plate 200, and a second limiting plate 300, which are sequentially matched and connected. The carrier plate 100 supports the base plate 400 to be welded, the first limiting plate 200, and the second limiting plate 300. The first limiting plate 200 limits the position of multiple power boards 500 on the base plate 400 to be welded on the carrier plate 100, so that a single power board 500 is confined to the position of a power board 500 in the first limiting plate 200, facilitating subsequent welding operations on the power boards 500.

[0050] Among them, the first limiting plate 200 includes: a first plate body 201 and a limiting bar 202. The limiting bar 202 is arranged in the first plate body 201. Through the limiting bar 202, the multiple power panels 500 on the carrier plate 100 are separated and limited. And through the limiting bar 202, the placement positions of the power panels 500 in the first plate body 201 are separated, and the spatial positions in the first plate body 201 are separated into placement positions of individual power panels 500, so that each power panel 500 is placed in a corresponding placement position in the first plate body 201. In this way, during the welding process of the power panels, the solder is prevented from flowing and sticking after being melted by high temperature, and the soldering of adjacent power panels is prevented from sticking together, thereby improving the reliability and stability of the power module during the welding process, reducing the wear of the power module and the welding jig, and improving the qualified rate of the power module products.

[0051] Furthermore, by installing the second limiting plate 300 on the first limiting plate 200, the resistors to be welded on the power board 500 are limited in position, allowing them to be efficiently and reliably welded to the power board 500. This prevents the resistors from shifting due to melting solder during the welding process, further improving the reliability and stability of the power module welding process, reducing wear on the power module and welding jig, increasing the qualified rate of power module products, and saving costs.

[0052] Next, combine Figure 1 and Figure 2 The structure of the power module welding fixture of this embodiment is described in detail:

[0053] like Figure 3 As shown, the carrier plate 100 includes: a carrier plate body 101 and a plurality of fixing columns 102 arranged on the carrier plate body 101. The fixing columns 102 are first matched and connected with the top corner mounting holes of the base plate 400 to be welded in a one-to-one correspondence, and then the fixing columns 102 are matched and connected with the mounting holes 204 of the first limiting plate 200 in a one-to-one correspondence. Specifically, one fixing column 102 is first matched and connected with the top corner mounting hole of a base plate 400 to be welded, and then matched and connected with the mounting hole 204 of the first limiting plate 200. Each fixing column 102 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 400 to be welded, so that the first boss 1021 is located in the top corner mounting hole. The second boss 1022 is configured to sequentially extend through the top corner mounting holes of the base plate 400 to be welded and the mounting holes 204 of the first limiting plate 200. The number and position of the fixing posts 102 of the support plate 100 and the number and placement of the mounting holes 204 of the first limiting plate 200 are determined based on the number and position of the top corner mounting holes of the base plate 400 to be welded, and can also be configured based on actual needs.

[0054] This allows the base plate 400 to be welded to be stably fixed on the carrier plate 100, and the first limiting plate 200 to be stably set on the carrier plate 100 and the base plate 400 to be welded, preventing the power board 500 and the base plate 400 from shifting. It also facilitates welding the power board 500 to the base plate 400 to be welded, improving the welding reliability and stability of the power module and increasing the qualified rate of power module products.

[0055] The carrier plate 100 further includes at least two oppositely disposed access slots 103 disposed on the edges of the carrier plate body 101. The access slots 103 are used to install and remove the first limiting plate 200 and the base plate 400 to be welded, thereby improving the convenience of installing the welding jig.

[0056] The carrier plate 100 serves as a load-bearing device, so its hardness is required. It is made of an alloy or other high-temperature-resistant material, such as graphite or steel. The alloy is chosen to ensure durability and thermal conductivity of the power module welding jig, while also reducing manufacturing costs.

[0057] like Figure 4 As shown, the first limiting plate 200 also includes at least one mounting slot group. The mounting slot groups are disposed on the first plate 201, and each mounting slot group includes two corresponding mounting slots 203. Limiting bars 202 are disposed within the mounting slot groups, with both ends of the limiting bars 202 correspondingly connected to the mounting slots 203 of the mounting slot groups.

[0058] Specifically, in Figure 4 In the embodiment, the first limiting plate 200 includes a mounting slot group, which includes two corresponding mounting slots 203. The mounting slot group is arranged on the first plate body 201, and the limiting strip 202 is arranged in the mounting slot group, and the two ends of the limiting strip 202 are matched and connected with the mounting slots 203 of the mounting slot group in a one-to-one manner. Through the limiting strip 202, the spatial position of the first plate body 201 is divided into two placement positions of the power panels 500, and the two power panels 500 on the carrier plate 100 are separated and limited. In this way, one power panel 500 is placed in the placement position of one power panel 500 in the first plate body 201, and the other power panel 500 is placed in the placement position of another power panel 500 in the first plate body 201. In this way, the solder of the power panel 500 is prevented from flowing and sticking after being melted by high temperature during the welding process, and the solder of adjacent power panels 500 is prevented from sticking together, thereby improving the reliability and stability of the power module during the welding process, reducing the wear of the power module and the welding jig, and improving the qualified rate of the power module product.

[0059] like Figure 5As shown, each end of the limiting strip 202 is provided with a horizontal protrusion 2021 and a vertical protrusion 2022. Figure 6 and Figure 7 As shown, one end of the limiting strip 202 is mated and connected to the mounting slot 203. The horizontal protrusion 2021 is snapped into the top of the mounting slot 203, and the vertical protrusion 2022 passes through the mounting slot 203 and is bent to connect to the bottom of the mounting slot 203. The vertical protrusion 2022 contacts the first plate 201. The vertical protrusion 2022 is bent to form a small edge, which enhances the stability of the limiting strip 202. The top of the mounting slot 203 is flush with the surface of the first plate 201 facing the support plate 100, and the bottom of the mounting slot 203 is flush with the surface of the first plate 201 facing the second limiting plate 300. Alternatively, the top of the mounting slot 203 is flush with the surface of the first plate 201 facing the second limiting plate 300, and the bottom of the mounting slot 203 is flush with the surface of the first plate 201 facing the support plate 100.

[0060] In this way, by matching the horizontal protrusions 2021 and vertical protrusions 2022 at each end of the limit bar 202 with the mounting slots 203, the limit bar 202 is stably positioned within the first limit plate 200, positioning the power board 500 in its corresponding position within the first plate body 201. This eliminates the need for the additional process and cost of separating the power boards, 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. Furthermore, the limit bar 202 is detachably connected to the first limit plate 200, facilitating its replacement.

[0061] In the specific implementation process, the number of the limiting bars 202 set in the installation slot group is two. Figure 4 As shown, two limit bars 202 are set in the installation slot group. In the installation slot 203 of the installation slot group, the vertical protrusions 2022 of the two limit bars 202 are bent and form two small edges, which further enhance the stability of the limit bars 202. In addition, if the number of limit bars 202 set in the installation slot group is one, the thickness of the limit bar 202 will be relatively thick. During the welding process, one limit bar 202 is prone to deformation due to stress, affecting the welding process of the power board. If the number of limit bars 202 set in the installation slot group is two, during the welding process, the stresses of the two limit bars 202 will offset each other. Therefore, the number of limit bars 202 set in the installation slot group is preferably two.

[0062] Furthermore, the two limit bars 202 will not completely contact and adhere after installation. Because the limit bars 202 are made of an alloy, they possess a certain degree of elasticity and are less susceptible to the thermal expansion and deformation caused by high-temperature welding of the power board. This makes it easier to remove the mold after welding without causing cracks or wear to the ceramic layer of the power board. Furthermore, the limit bars 202 provide a certain degree of isolation during soldering, preventing adhesion and improving the reliability of the power module after welding.

[0063] In addition, due to the compact layout of the power boards inside some IGBT modules, the two power boards need to be separated during welding to prevent the solder from sticking together between the DBC ceramics. The spacing between the power boards is too narrow, such as within 1 mm. At this time, the material selection of the power module welding jig needs to be considered. The use of alloy welding jigs (referred to as alloy jigs) will cause wear or cracking of the ceramic layer of the power board. The use of graphite welding jigs (referred to as graphite jigs) will make the graphite welding jigs more easily damaged due to the small spacing, and the life span will be greatly reduced, resulting in increased costs. Therefore, the material of the first plate body 201 is graphite, and the material of the limit bar 202 is alloy material.

[0064] It is further necessary to explain that the existing power module welding jigs are made of a uniform material, and alloy jigs or graphite jigs are mostly used. During the manufacturing process of the ME4 power module, when the power board with the power chip is welded to the external heat sink, the spacing between adjacent power boards is required to be relatively high, generally within 1mm. At this time, if an alloy jig is used, the hardness of the alloy is higher than the hardness of the ceramic layer of the power board. When the alloy jig is removed, wear or jamming occurs, causing the power board to wear or damage. The ceramic layer of the power board will wear or break due to friction between the alloy jig and the power board when it is removed, and then the welding will fail. If a graphite jig is used, due to the flexibility of the graphite jig, the spacers of the graphite jig are smaller than the spacing between the power boards, and the hardness of the ceramic layer of the power board is higher than the hardness of graphite, the graphite jig is easily worn or damaged, resulting in the breakage of the spacers of the graphite jig, which reduces the life of the graphite jig and consumes a lot of cost.

[0065] Therefore, in this embodiment, the first plate 201 is made of graphite, and the limiting strip 202 is made of an alloy. Since the toughness of a jig made of graphite is greater than that of an alloy, the ceramic layer of the power board will not be abraded during mold removal. Therefore, the first plate 201 is made of graphite to avoid abrasion of the power board during placement and removal of the first limiting plate 200. Since limiting strips made of alloy are harder than those made of graphite, limiting strips 202 are made of alloy to avoid breakage, effectively isolating adjacent power boards and preventing them from sticking together.

[0066] like Figure 4As shown, the first limiting plate 200 further includes: a plurality of mounting holes 204 and a plurality of limiting plate placement slot groups. The mounting holes 204 are provided on the first plate body 201. A limiting plate placement slot group is provided corresponding to the placement position of a power board 500 in the first plate body 201. Each limiting plate placement slot group includes two corresponding limiting plate placement slots 205.

[0067] The mounting hole 204 extends through the second boss 1022 of the fixing column 102 of the carrier plate 100 and is used to position the first limiting plate 200 on the carrier plate 100 and the base plate 400 to be welded. This further ensures the stability and reliability of the power board 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.

[0068] The positioning plate placement slot assembly is used to position the second positioning plate 300 within the positioning plate assembly, ensuring a one-to-one correspondence between the second positioning plate 300 and the placement position of the power board 500 within the first plate body 201. This positioning plate placement slot assembly allows the second positioning plate 300 to be positioned so that it aligns with the placement position of the power board 500 within the first plate body 201, enabling efficient welding of the power board 500. This 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.

[0069] like Figure 8 As shown, the second limiting plate 300 includes: a second plate body 301, a taking hole 302 and a mounting protrusion 303. The material of the second plate body 301 can be an alloy material. The alloy material is durable, and the weight of the alloy material meets the counterweight requirements, so that the second limiting plate 200 can also add counterweight to the power board, preventing welding voids between the power board and the base plate to be welded, which affects the welding effect. The provision of the second limiting plate 300 improves the welding reliability and stability of the power module, and increases the qualified rate of the power module products.

[0070] The access hole 302 is set in the second plate body 301, and the access hole 302 is set corresponding to the placement position of the power board 500. The access hole 302 is used to take the second limit plate 300 and the welding condition can be observed through the access hole 302. Specifically, the shape and number of the access hole 302 can be set according to actual needs, such as Figure 8The two second limiting plates 300 shown have two elliptical access holes 302 in their second plate bodies 301. One second limiting plate 300 and its two access holes 302 are positioned correspondingly to the placement of a power board 500 in the first plate body 201, while the other second limiting plate 300 and its two access holes 302 are positioned correspondingly to the placement of another power board 500 in the first plate body 201.

[0071] The mounting protrusions 303 mate with the stop plate placement slots 205. Specifically, the shape of the mounting protrusions 303 can be customized based on actual needs. The number of mounting protrusions 303 can be determined based on the number of stop plate placement slots 205. The mounting protrusions 303 are used to stably and conveniently mount the second stop plate 300 on the first stop plate 200, accurately positioning the second stop plate 300 on the first plate 201 where the power board 500 is placed, facilitating welding operations on the power board.

[0072] The second limiting plate 300 includes a resistor limiting hole 304. The resistor limiting hole 304 is provided on the second plate body 301 and extends toward the carrier plate 100 so that the resistor to be welded is welded to the power board 500 through the resistor limiting hole 304. Specifically, the position of the resistor limiting hole 304 is determined according to the welding position of the resistor to be welded on the power board 500. Figure 8 In the example shown, resistor stop holes 304 are positioned near the corners of second stop plate 300 and extend downward to the power board 500 to be soldered. The resistor to be soldered is placed within resistor stop holes 304 and soldered to power board 500 through resistor stop holes 304. Therefore, the provision of resistor stop holes 304 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.

[0073] The second limiting plate 300 includes: a counterweight protrusion 305. The counterweight protrusion 305 is arranged on the plate surface of the second plate body 301 facing the carrier plate 100. The counterweight protrusion 305 extends toward the carrier plate 100 and is in pressure contact with the power plate 500 to increase the counterweight of the power plate 500. Specifically, the number of the counterweight protrusion 305 can be set according to actual needs. Figure 8 As shown, the counterweight protrusion 305 is provided on the bottom surface of the second plate body 301 , and the counterweight protrusion 305 extends downward, ie, extends toward the carrier plate 100 , and the counterweight protrusion 305 is in press-contact with the power board 500 .

[0074] In this embodiment, the provision of resistor stop holes 304 and counterweight protrusions 305 ensures that the circular resistor does not move during soldering, ensuring a high soldering success rate and further improving the reliability and stability of the power module. Furthermore, the resistor stop holes 304 and counterweight protrusions 305 ensure sufficient pressure contact with the power board, ensuring sufficient contact between the power board and the solder, preventing insufficient soldering between the power board and the power semiconductor baseplate, which could lead to solder voids and potentially affect product performance.

[0075] 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.

[0076] 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 power module welding jig, characterized in that: include: The supporting 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 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 first limiting plate is used to limit the placement positions of the multiple power boards of the base plate to be welded on the carrying plate; The second limiting plate is used to be mounted on the first limiting plate to limit the resistor to be welded on the power board; Among them, the first limiting plate includes: a first plate body and a limiting bar, and the limiting bar is set in the first plate body to separate and limit the multiple power boards through the limiting bar, and separate the placement positions of the power boards in the first plate body, so that the power boards are placed in the corresponding placement positions in the first plate body.

2. The power module welding jig according to claim 1, wherein: Each of the two ends of the limiting strip is provided with a horizontal protrusion and a vertical protrusion; The first limiting plate further includes: at least one mounting slot group, the mounting slot group being provided on the first plate body, each mounting slot group including two correspondingly provided mounting slots; the limiting strip being provided in the mounting slot group, and the ends of the limiting strip being matched and connected with the mounting slots of the mounting slot group in a one-to-one correspondence; One end of the limit bar is matched and connected to the installation slot, the horizontal protrusion is clamped on the top of the installation slot, the vertical protrusion passes through the installation slot and is bent and connected to the bottom of the installation slot, and the vertical protrusion is in contact with the first plate.

3. The power module welding jig according to claim 2, wherein: The number of the limiting bars arranged in the installation slot group is two.

4. The power module welding jig according to claim 2, wherein: The first plate is made of graphite, and the limiting strip is made of alloy.

5. The power module welding jig according to claim 2, wherein: The first limiting plate further comprises: a plurality of mounting holes and a plurality of limiting plate placement slot groups, wherein the mounting holes are provided on the first plate body, one limiting plate placement slot group is correspondingly provided at a placement position of one of the power boards in the first plate body, and each limiting plate placement slot group comprises two correspondingly provided limiting plate placement slots; The mounting hole is used to set the first limiting plate on the bearing plate and the base plate to be welded; The limiting plate placement slot group is used to place the second limiting plate in the limiting plate placement slot group, so that the second limiting plate is arranged in a one-to-one correspondence with the placement position of the power board in the first plate body.

6. The power module welding jig according to any one of claims 1 to 5, characterized in that: The supporting plate includes: a supporting plate body and a plurality of fixing posts provided on the supporting plate body; the fixing posts are 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 posts are then matched and connected with the mounting holes of the first limiting plate in a one-to-one correspondence to fix the base plate to be welded; Each of the fixing columns includes: a first boss and a second boss, wherein the second boss is disposed on the first boss, and a diameter of the second boss is not greater than a diameter of the first boss; The first boss is used to match and connect with the top corner mounting hole of the base plate to be welded; The second boss is used to sequentially penetrate the top corner mounting hole of the base plate to be welded and the mounting hole of the first limiting plate.

7. The power module welding jig according to claim 6, 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.

8. The power module welding jig according to any one of claims 1 to 5, characterized in that: The second limiting plate includes: a second plate body, a taking hole and a mounting protrusion; The taking hole is provided in the second plate body, and the taking hole is provided corresponding to the placement position of the power board; The mounting protrusion is matched and connected with the limiting plate placement groove of the first limiting plate.

9. The power module welding jig according to claim 8, wherein: The second limiting plate includes: a resistor limiting hole; the resistor limiting hole is set on the second plate body, and the resistor limiting hole extends toward the supporting plate, so that the resistor to be welded is welded to the power plate through the resistor limiting hole.

10. The power module welding jig according to claim 9, wherein: The second limiting plate includes a counterweight protrusion, which is arranged on the plate surface of the second plate body facing the supporting plate. The counterweight protrusion extends toward the supporting plate and is in pressure contact with the power plate to increase the counterweight of the power plate.

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