Power module welding jig
By designing upright and inverted components for the power module welding fixture, and utilizing the flip-mounting method of the inverted component, the problems of inconvenient manual placement and displacement of pins were solved, thereby improving the stability and welding accuracy of pins.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-03-24
AI Technical Summary
Existing welding fixtures are inconvenient to operate and prone to displacement when the pins are placed manually, which affects the welding accuracy.
Design a power module welding fixture, including a positive mounting component and an inverted mounting component. The positive mounting component includes a DBC fixing part and a welding base, and the inverted mounting component includes a pin fixing part, an elastic limiting part and a pressure relief component. The pin is installed by first inverting and then flipping the inverted mounting component to the positive position, and the positional stability of the pin is improved by using the elastic limiting part and the pressure relief component.
It reduces the assembly difficulty of pins, improves the positional stability and accuracy during the welding process, reduces pin misalignment, and optimizes the consistency of welding strength.
Smart Images
Figure CN224026824U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to welding fixture technical field especially relates to a power module welding fixture. BACKGROUND
[0002] Module packaging is to weld power chip on DBC (Direct Bonding Copper, copper clad plate), and the upper surface of power chip is connected with independent metal layer by metal bonding. Pin is a kind of metal device used to complete electric (signal) conduction (transmission) in connector, and is widely used in electronic components.In the production of electronic equipment, multiple pins need to be welded, which are connected with other different electronic components (such as the above-mentioned chip) control elements to realize different functions.
[0003] Under the existing process, the pin needs to be placed manually on the fixture, and then reflow soldering is carried out, but human error may occur in this process, or the pin may not contact well with the DBC or may be displaced during welding. UTILITY MODEL CONTENT
[0004] In order to overcome the above technical defects, the utility model aims at providing a power module welding fixture to solve the problem of manual placement of pin in existing welding fixture, inconvenient operation and easy displacement, which affects the welding precision.
[0005] The utility model discloses a kind of power module welding fixtures, comprising:
[0006] Vertical assembly, including DBC fixed part and welding base for placing bottom plate;
[0007] Flip assembly, with installation end face, the installation end face is equipped with Pin fixed part, elastic limiting part and pressure relief piece;
[0008] Fixing piece is used for the fixing after the assembly of vertical assembly and flip assembly;
[0009] The DBC fixed part is used for fixing DBC plate, so that DBC plate is placed above the bottom plate;
[0010] The installation end face of the flip assembly is placed above the vertical assembly, so that the Pin fixed part, elastic limiting part and pressure relief piece are arranged from bottom to top in sequence, so that the one end of Pin with solder is placed on DBC plate, and the other end extends to the elastic limiting part after passing through the Pin fixed part.
[0011] Preferably, the fixing piece includes fixing pin;
[0012] The fixing pin is sequentially fixedly connected with the Pin needle fixing part, the DBC fixing part and the bottom plate.
[0013] Preferably, the Pin needle fixing part is provided with a plurality of through holes for the Pin needle to pass through.
[0014] Preferably, the elastic limiting part comprises silica gel or thermoplastic elastomer.
[0015] Preferably, the pressure releasing part comprises at least one pressing block.
[0016] Preferably, the mounting end face of the inverted assembly is provided with an extension;
[0017] One side of the extension is connected with the mounting end face, and the other side is connected with the DBC fixing part after the mounting end face of the inverted assembly is placed above the upright assembly.
[0018] Preferably, the height of the extension does not exceed the length of the Pin needle.
[0019] Preferably, the fixing part passes through the extension to connect the Pin needle fixing part and the DBC fixing part.
[0020] After the above technical scheme is adopted, compared with the prior art, the following beneficial effects are achieved:
[0021] The power module welding jig comprises a DBC fixing part, a welding base, a Pin needle fixing part, an elastic limiting part and a pressure releasing part. The DBC fixing part and the welding base are arranged as an upright assembly, i.e., the upright assembly can be placed vertically during assembly (the DBC fixing part is above the welding base). The Pin needle fixing part, the elastic limiting part and the pressure releasing part are arranged as an inverted assembly, i.e., the Pin needle is first installed by inverting the inverted assembly during assembly, and then the inverted assembly is turned to be placed vertically and connected with the DBC fixing part. The side of the Pin needle fixing part facing the DBC fixing part is a mounting end face. Therefore, the assembly of the Pin needle is facilitated, and the problem of manual placement of the Pin needle in the prior art welding jig, which is inconvenient to operate and is prone to displacement, thereby affecting the welding precision, is solved. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 FIG. 1 is a structural schematic view of the power module welding jig embodiment of the utility model;
[0023] Figure 2 FIG. 2 is a structural schematic view of the Pin needle fixing part in the power module welding jig embodiment of the utility model;
[0024] Figure 3 FIG. 3 is a structural schematic view of the elastic limiting part in the power module welding jig embodiment of the utility model.
[0025] REFERENCE SIGNS:
[0026] 1-welding base; 11-bottom plate; 2-DBC fixing part; 21-DBC plate; 3-Pin needle fixing part; 31-Pin needle; 32-through hole; 33-mounting end face; 4-elastic limiting part; 5-pressure releasing piece; 6-fixing piece; 7-extension part. DETAILED DESCRIPTION
[0027] The advantages of the present application will be further illustrated in conjunction with the specific embodiments and the accompanying drawings.
[0028] The exemplary embodiments will be described in detail herein below with reference to the accompanying drawings. In the following description, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present disclosure. Rather, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.
[0029] The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in the present disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or," as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.
[0030] It will be understood that, although the terms first, second, third, etc. can be used herein to describe various information, these terms are not intended to denote a particular order or hierarchy. These terms are used only to distinguish one from another. For example, a first information can be termed a second information, and, similarly, a second information can be termed a first information, without departing from the scope of the present disclosure. Depending on the context, the word "if' as used herein can be interpreted to mean "when" or "in response to determining" or "in response to a determination."
[0031] In the description of the present application, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0032] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0033] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.
[0034] Example: This embodiment provides a power module welding fixture, which is used in the welding process of power modules. See details below. Figures 1-3 This welding fixture is used to realize the base plate 11, DBC plate 21, and pin 31. Its structure effectively reduces the difficulty of assembling and welding the pin 31, improves the positional stability and accuracy of the pin 31 during the welding process, and enhances welding precision. Specifically, the welding fixture includes:
[0035] The mounting assembly includes a DBC fixing part 2 and a welding base 1 for placing the base plate 11;
[0036] The inverted assembly has a mounting end face 33, on which a pin fixing part 3, an elastic limiting part 4, and a pressure relief part 5 are provided; the mounting end face 33 is used to describe
[0037] Fastener 6 is used to secure the upright and inverted components after assembly.
[0038] The DBC fixing part 2 is used to fix the DBC board 21, so that the DBC board 21 is placed above the base plate 11;
[0039] The mounting end face 33 of the inverted assembly is placed above the upright assembly, so that the pin fixing part 3, the elastic limiting part 4 and the pressure relief part 5 are arranged sequentially from bottom to top, so that the pin 31 has one end of solder placed on the DBC board 21, and the other end extends through the pin fixing part 3 to the elastic limiting part 4 and is then limited.
[0040] It is understood that the aforementioned mounting end face 33 is used to describe the assembly of the inverted and upright components, and it can be part of the pin fixing part 3 or a separate structure.
[0041] As an illustration, the welding jig provided by the embodiment includes a welding base 1, a DBC fixing part 2, a pin needle fixing part 3, an elastic limiting part 4 and a pressure releasing part 5. The welding base 1 and the DBC fixing part 2 are arranged as a normal assembly, and the pin needle fixing part 3, the elastic limiting part 4 and the pressure releasing part 5 are arranged as an inverted assembly. In the process of assembling the welding jig with the bottom plate 11, the DBC plate 21 and the pin needle 31, the welding base 1 and the DBC fixing part 2 are arranged as a normal assembly, but the pin needle fixing part 3, the elastic limiting part 4 and the pressure releasing part 5 are arranged as an inverted assembly and then are turned over to be arranged as a normal assembly. The purpose of the operation is to facilitate the assembly of the pin needle 31.
[0042] As an illustration, the welding jig provided by the embodiment includes a welding base 1, a DBC fixing part 2, a pin needle fixing part 3, an elastic limiting part 4 and a pressure releasing part 5. The welding base 1 and the DBC fixing part 2 are arranged as a normal assembly, and the pin needle fixing part 3, the elastic limiting part 4 and the pressure releasing part 5 are arranged as an inverted assembly. In the process of assembling the welding jig with the bottom plate 11, the DBC plate 21 and the pin needle 31, the welding base 1 and the DBC fixing part 2 are arranged as a normal assembly, but the pin needle fixing part 3, the elastic limiting part 4 and the pressure releasing part 5 are arranged as an inverted assembly and then are turned over to be arranged as a normal assembly. The purpose of the operation is to facilitate the assembly of the pin needle 31.
[0043] In the embodiment, the DBC fixing part 2 is used to assemble the DBC plate 21, and therefore can be a frame structure. The middle of the frame structure is used to connect the DBC plate 21. As an example, the DBC fixing part 2 can connect three parallel DBC plates 21. The pin needle 31 needs to be welded with the DBC plate 21. Therefore, the pin needle fixing part 3 covers part of the area where the DBC plate 21 is located. Specifically, the position of the pin needle 31 can be arranged according to the actual needs. The elastic limiting part 4 corresponds to the pin needle fixing part 3 and is used to further limit the end of the pin needle 31. The pressure releasing part 5 is used to give a certain pressure to the pin needle 31 during the welding process, so as to reduce the movement of the pin needle 31 during the welding process. Therefore, when the inverted assembly is turned over to be arranged as a normal assembly, the pressure releasing part 5 can be located at any position above the pin needle fixing part 3 to release a certain pressure to the pin needle 31.
[0044] In the embodiment, the pin needle fixing part 3 is arranged to limit the position of the pin needle 31, that is, to guide the arrangement of the pin needle 31. Specifically, as shown in FIG. 1, the pin needle fixing part 3 is arranged to cover part of the area where the pin needle 31 is located. The pin needle 31 is arranged to pass through the pin needle fixing part 3 and then is arranged to pass through the elastic limiting part 4. Figure 2As shown, the Pin needle fixing part 3 is provided with a plurality of through holes 32 through which the Pin needle 31 passes, i.e. the position of each Pin needle 31 is predetermined through the through hole 32. Further, the above-mentioned elastic limiting part 4 is provided to further limit the end of the Pin needle 31. Specifically, the elastic limiting part 4 includes but is not limited to silica gel, thermoplastic elastomer, etc., which can make the end of the Pin needle 31 extend therein and have a structure that can wrap the end of the Pin needle 31 with elasticity, or a hole-shaped structure corresponding to the above-mentioned through hole 32 can be pre-set in the elastic limiting part 4, and the inner diameter thereof is not greater than the structure of the end of the Pin needle 31, so that the end of the Pin needle 31 is limited under the action of elasticity after entering, thereby improving the limiting effect. As an example, the elastic limiting part 4 is provided as a silica gel fixing part similar to the structure of the Pin needle fixing part 3 or covering each through hole 32. When the flip-chip assembly is inverted, the pressure relief member 5 is located at the bottom, and the silica gel fixing part and the Pin needle fixing part 3 are located above. The Pin needle 31 enters the Pin needle fixing part 3 from the uppermost end and extends to the silica gel fixing part and is limited. At this time, the Pin needle 31 cannot move under the action of silica gel, and then the flip-chip assembly is turned upright, so that the Pin needle 31 with solder is placed on the DBC board 21, and the other end is limited by the silica gel.
[0045] It can be understood that the above-mentioned elastic limiting part 4 covers the area of the Pin needle fixing part 3 through which the through hole 32 of the Pin needle 31 passes (such as Figure 3 As shown, Figure 3 The DBC board 21 below the Pin needle fixing part 3 is correspondingly provided with a hollow in the embodiment, and the Pin needle fixing part 3 can be applied as Figure 2 An example of a complete plate, or can be applied as Figure 3 An example of a plate with a hollow area), and the above-mentioned elastic limiting part 4, such as silica gel filling, etc., ensures the problem of accurate positioning and falling of the Pin needle 31 during flip-chip.
[0046] In the embodiment, the fixing member 6 includes a fixing pin; the fixing pin is fixedly connected in sequence through the Pin needle fixing part 3, the DBC fixing part 2 and the bottom plate 11. Specifically, it can also be a bolt, a screw rod or other fixing structure (such as a rod-shaped structure with a limit), which does not affect the subsequent welding process. The above-mentioned fixing member 6 is used to connect the normal assembly and the flip-chip assembly, so that the fixing member 6 can be connected as a detachable connection structure for convenient assembly process. In addition to the above, the above-mentioned elastic limiting part 4 / pressure relief member 5 can also be connected by a fixing pin and other fixing members 6.
[0047] In the present embodiment, the pressure releasing part 5 includes at least one pressing block, which is used to release pressure on the Pin needle fixing part 3 when the flip-chip assembly is upright, and does not cause pressure on the Pin needle fixing part 3 when the flip-chip assembly is inverted. Therefore, the pressing block pressure releasing part 5 does not cause pressure on the Pin needle fixing part 3 when the flip-chip assembly is inverted, and exerts a certain pressure on the Pin needle fixing part 3 under the gravity after being turned upright, thereby releasing pressure on the Pin needle 31 / Pin needle fixing part 3 between the upright assembly and the flip-chip assembly, and increasing the contact with the DBC plate 21. Multiple pressing blocks are provided, i.e. separate top pressing blocks are formed to ensure effective contact of the Pin needle 31 with the substrate (DBC plate 21) during welding, and promote tin climbing at the bottom of the Pin needle 31, so that the welding strength of the Pin needle 31 is consistent.
[0048] For the above-mentioned pressing block, in order to facilitate connection with the Pin needle fixing part 3 / elastic limiting part 4, the pressing block can be extended at both ends away from the Pin needle fixing part 3 (as shown in Figure 1 The fixing part 6 (which can be the same as or different from the above-mentioned fixing part 6) is used to connect the Pin needle fixing part 3 / elastic limiting part 4.
[0049] In addition to the above, other existing structures that can release pressure in a predetermined direction (such as structures similar to push rods, air cylinders, etc.) and do not affect the welding process can also be used.
[0050] In a preferred embodiment, the flip-chip assembly has an extension 7 on the mounting end surface 33; one side of the extension 7 is connected to the mounting end surface 33, and the other side is connected to the DBC fixing part 2 after the mounting end surface 33 of the flip-chip assembly is placed above the upright assembly. Based on the above, the extension 7 is used to form a certain space between the upright assembly and the flip-chip assembly, and the Pin needle 31 is located in the space, thereby dispersing a part of the Pin needle 31 installed on the flip-chip assembly, and improving the safety during use after the flip-chip assembly is inverted.
[0051] Based on the above, as a further option, the height of the extension 7 does not exceed the length of the Pin needle 31, so that after the flip-chip assembly is inverted, even if the elastic limiting part 4 is removed, the Pin needle 31 will not completely move out of the through hole 32 on the Pin needle fixing part 3, thereby reducing the movement of the Pin needle 31 during welding.
[0052] Further, based on the above, the fixing member 6 is arranged to pass through the extension 7 to connect the Pin needle fixing part 3 and the DBC fixing part 2, specifically, the extension 7 is arranged at the four corners of the mounting end face 33, and the positioning pin is also arranged to pass through the four corners to connect and fix, thereby improving the stability of the entire device, so that the bottom plate 11, the DBC plate 21 and the Pin needle 31 can remain stable during the welding process, and the welding effect is improved.
[0053] In addition, the use of the power module welding jig includes:
[0054] Prepare the upright assembly and the inverted assembly. First, the upright assembly is upright, the bottom plate 11 is placed on the welding base 1, and the DBC fixing part 2 is placed on the bottom plate 11. The DBC plate 21 is supported by the DBC fixing part 2, and solder is applied between the DBC plate 21 and the bottom plate 11. Then the inverted assembly is inverted first, at this time the mounting end face 33, the Pin needle fixing part 3, the elastic limiting part 4 (silicone) and the pressure relief member 5 (pressure block) are arranged in order from top to bottom, the Pin needle 31 passes through the mounting end face 33, the Pin needle fixing part 3 (the through hole 32 therein) and extends to the silicone, and after being turned over, it is upright on the DBC fixing part 2 and is fixed by the fixing pin, so that the Pin needle 31 is located on the DBC plate 21, and solder is applied between the Pin needle 31 and the DBC plate 21. At this time, the pressure block is pressed down under the action of its gravity, so that the Pin needle 31 is limited between the upright assembly and the inverted assembly under a certain pressure, the bottom plate 11, the DBC plate 21 and the Pin needle 31 are fixed, welding is performed, the Pin needle 31 is limited in the through hole 32 in the Pin needle fixing part 3, and is pressed to stably abut against the DBC plate 21, thereby reducing the assembly difficulty of the Pin needle 31, optimizing the problem of inconsistent welding strength, and reducing the deviation of the Pin needle 31 during welding.
[0055] In addition, after the above assembly is completed, before welding, in order to prevent the elastic limiting part 4 from being inverted and damaged due to high temperature during welding, the silicone can also be extracted, so that the Pin needle 31 naturally falls to the DBC plate 21 under the action of gravity, and the pressure block is pressed to make the Pin needle 31 abut against the DBC plate 21 for welding.
[0056] In the embodiment, the DBC fixing part 2, the welding base 1, the Pin needle fixing part 3, the elastic limiting part 4 and the pressure relief part 5 are arranged, the DBC fixing part 2 and the welding base 1 are arranged as a positive assembly, that is, the DBC fixing part 2 is arranged above the welding base 1 during assembly, the Pin needle fixing part 3, the elastic limiting part 4 and the pressure relief part 5 are arranged as an inverted assembly, that is, the Pin needle 31 is installed by first inverting during assembly, then the inverted assembly is turned to be arranged in a normal position and connected with the DBC fixing part 2, wherein the installation end surface 33 is arranged on the side of the Pin needle fixing part 3 facing the DBC fixing part 2, so that the Pin needle 31 is fixed conveniently, and the Pin needle 31 is further limited by passing through the Pin needle fixing part 3 due to the arrangement of the elastic limiting part 4, the position of the Pin needle 31 is not moved due to the end part being wrapped and limited by the elastic limiting part 4 during the normal arrangement and / or inversion of the inverted assembly, and after the inverted assembly is turned to be arranged in a normal position, the Pin needle 31 is in contact with the DBC plate 21, and the Pin needle 31 is further limited under the pressure of the pressing block, so that the displacement risk during welding is reduced, and the welding jig can effectively reduce the assembly and welding difficulty of the Pin needle 31 and improve the position stability and accuracy of the Pin needle 31 during welding.
[0057] Based on the above, as a supplement, for the bottom plate 11, the DBC plate 21 and the Pin needle 31 during the above welding process, in order to make the effect of the finished product after welding better, the bottom plate 11 can also be integrated with a heat dissipation module, a heat dissipation water channel and the like, and the bottom plate 11 can also be arranged in cooperation with the DBC plate 21. The uniformity and consistency of temperature rise and the close fitting degree are improved, and the precision of the welded product (power module) is improved.
[0058] It should be noted that the embodiments of the utility model have better implementation, and do not limit the utility model in any form, and any skilled person in the art can change or modify the equivalent effective embodiments by using the disclosed technical content, as long as the content of the utility model technical scheme is not deviated, any modification or equivalent change and modification of the above embodiments according to the technical essence of the utility model still belong to the range of the utility model technical scheme.
Claims
1. A power module welding fixture, characterized in that, include: The mounting components include the DBC mounting bracket and a welded base for placing the base plate; The inverted assembly has a mounting end face, on which a pin fixing part, an elastic limiting part and a pressure relief part are provided; Fasteners are used to secure the upright and inverted components after assembly. The DBC fixing part is used to fix the DBC board so that the DBC board is placed above the base plate; The mounting end face of the inverted assembly is positioned above the upright assembly, thereby arranging the pin fixing part, the elastic limiting part, and the pressure relief part sequentially from bottom to top, so that one end of the pin with solder is placed on the DBC board, and the other end extends through the pin fixing part to the elastic limiting part for rear limiting.
2. The power module welding fixture according to claim 1, characterized in that: The fastener includes a fixing pin; The fixing pin passes through the pin fixing part and the DBC fixing part in sequence and is fixedly connected to the base plate.
3. The power module welding fixture according to claim 1, characterized in that: The pin fixing part is provided with several through holes for the pin to pass through.
4. The power module welding fixture according to claim 1, characterized in that: The elastic limiting part includes silicone and thermoplastic elastomer.
5. The power module welding fixture according to claim 1, characterized in that: The pressure relief component includes at least one pressure block.
6. The power module welding fixture according to claim 1, characterized in that: The inverted assembly has an extension on its mounting end face; One side of the extension is connected to the mounting end face, and the other side is connected to the DBC fixing part after the mounting end face of the inverted assembly is placed above the upright assembly.
7. The power module welding fixture according to claim 6, characterized in that: The height of the extension does not exceed the length of the pin.
8. The power module welding fixture according to claim 6, characterized in that: The fastener passes through the extension and connects the pin fixing part and the DBC fixing part.