Welding cushion block for power module

Abstract

The utility model provides a welding cushion block for a power module, and relates to the technical field of semiconductors. The welding cushion block comprises a base, a first limiting groove extending in the first horizontal direction is formed in the top of the base, a first fixing piece extends in the second horizontal direction and is located in the first limiting groove, and the two ends of the first fixing piece and the side face of the first limiting groove are arranged at intervals. The second fixing piece is parallel to the first fixing piece and located in the first limiting groove, a first supporting face used for supporting the heat dissipation substrate is formed on the top face of the second fixing piece, the second fixing piece is located on one side of the first fixing piece, and a positioning groove used for positioning the DBC is formed by the top face of the second fixing piece and the top face of the first fixing piece. The second fixing piece is arranged to move towards the side away from the first fixing piece in the first horizontal direction. According to the welding cushion block, the distance between the welding cushion blocks can be adjusted so as to be matched with the distance between the heat dissipation substrate and the DBC in the power module, and the adaptation degree of the welding cushion block is improved.

Description

Technical Field

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

[0002] In the field of power electronics, the power module is one of the core components, and its performance directly affects the stability and efficiency of the entire electronic system. Power modules are usually composed of a heat dissipation substrate (such as a copper plate or aluminum plate), a DBC (Direct Copper Bonding, direct copper-bonded ceramic substrate) and other electronic components. As a material with high thermal conductivity and high insulation performance, DBC is widely used in power modules to achieve effective heat transfer and electrical isolation. During the assembly process of the power module, the welding pad is not only used to support the structure of the entire power module, but also to ensure the precise positioning and stable connection between the DBC and the heat dissipation substrate.

[0003] In the prior art, soldering pads are typically designed to be structurally fixed, with multiple structures within the pad being connected and secured. This type of pad is suitable for soldering power modules that do not require strict structural stability and is convenient for mass production. However, the conventional soldering pads cannot be properly adjusted to the spacing between the heat sink and the DBC in the power module, resulting in a poor fit between the soldering pad and the power module. Utility Model Content

[0004] One purpose of the present invention is to provide a welding pad for a power module, so as to solve the technical problem in the prior art that the welding pad has a low degree of compatibility with the power module due to its fixed structural connection.

[0005] Another purpose of the present invention is to improve the stability of power module welding.

[0006] According to the purpose of the present utility model, the present utility model provides a welding pad for a power module, the power module includes a heat dissipation substrate and at least one DBC, the heat dissipation substrate is fixedly connected to the DBC, the welding pad is used to support the power module, and the welding pad includes:

[0007] A base, wherein a first limiting groove extending along a first horizontal direction is provided on the top of the base;

[0008] a first fixing member extending along a second horizontal direction and located in the first limiting groove, with two ends of the first fixing member spaced from side surfaces of the first limiting groove so that the first fixing member can move relative to the base along the first horizontal direction, the second horizontal direction being perpendicular to the first horizontal direction;

[0009] The second fixing member is parallel to the first fixing member and is located in the first limiting groove. The top surface of the second fixing member is formed with a first supporting surface, and the supporting surface is used to support the heat dissipation substrate. The second fixing member is located on one side of the first fixing member, and the second fixing member and the top surface of the first fixing member form a positioning groove, and the positioning groove is used to position the DBC. The second fixing member is configured to move along the first horizontal direction toward a side away from the first fixing member.

[0010] Optionally, the welding pad further includes:

[0011] The third fixing member is located on a side of the first fixing member away from the second fixing member. The third fixing member is fixedly installed in the first limiting groove. A second supporting surface is formed on the top of the third fixing member for supporting the heat dissipation substrate.

[0012] Optionally, the heat dissipation substrate is provided with a mounting position, and the heat dissipation substrate further includes at least one connecting member, the connecting member being configured to protrude downward from the top surface of the heat dissipation substrate toward the mounting position, and the third fixing member further includes:

[0013] At least one clearance groove corresponding to the connecting member is located on a side of the third fixing member close to the first fixing member.

[0014] Optionally, the third fixing member further includes:

[0015] The protruding portion extends along the first horizontal direction, is located at an end of the third fixing member close to the first fixing member, and is configured to abut against the end of the first fixing member.

[0016] Optionally, a second limiting groove is provided on the top of the first fixing member, and the first fixing member further comprises:

[0017] An elastic pad is located in the second limiting groove, and the elastic pad is used to support the DBC.

[0018] Optionally, the elastic pad is made of polyurethane material.

[0019] Optionally, the base further includes:

[0020] The limiting protrusion is located on a side of the third fixing member away from the first fixing member, and the limiting protrusion is used to limit the third fixing member.

[0021] Optionally, a plurality of positioning holes are provided on the top of the base, and the welding pad further comprises:

[0022] Multiple positioning members are arranged corresponding to the positioning holes, and the multiple positioning members are evenly distributed at both ends of the first fixing member and the second fixing member. Each of the positioning members includes a positioning surface. After the positioning member is fixed in the positioning hole, its positioning surface abuts against the corresponding first fixing member or the second fixing member.

[0023] The utility model arranges the side surfaces of the limiting groove of the welding pad to be spaced apart from the first fixing member and the second fixing member, and arranges the first fixing member and the second fixing member to be movable along the first horizontal direction relative to the base, that is, by moving the first fixing member and the second fixing member along the first horizontal direction, the spacing between the first fixing member and the second fixing member can be adjusted to adapt to the spacing between the heat dissipation substrate and the DBC in the power module. At the same time, the top surface of the first fixing member and the second fixing member form a positioning groove for positioning the DBC, which can prevent the DBC from moving during welding, improve the adaptability of the welding pad and the power module, thereby improving the convenience of use of the welding pad and improving the positioning stability of the welding pad on the DBC, thereby improving the installation flatness of the DBC.

[0024] Furthermore, the welding pad of the present invention also includes a third fixing member, which is arranged on the side of the first fixing member away from the second fixing member, and a second supporting surface is provided on the top of the third fixing member, that is, the first supporting surface and the second supporting surface are used to jointly support the heat dissipation substrate, and the first supporting surface, the second supporting surface and the first fixing member form a positioning groove to position the DBC, improve the stability of the welding pad, and thus ensure the installation stability of the heat dissipation substrate and DBC.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a welding pad according to an embodiment of the present utility model;

[0028] Figure 2 is a schematic cross-sectional view of a welding pad according to an embodiment of the present invention;

[0029] Figure 3is a schematic structural diagram of a base according to an embodiment of the present utility model;

[0030] Figure 4 is a schematic structural diagram of a first fixing member according to an embodiment of the present utility model;

[0031] Figure 5 This is a schematic installation diagram of a welding pad and a power module according to an embodiment of the present utility model;

[0032] Figure 6 is a schematic structural diagram of a power module according to an embodiment of the present utility model;

[0033] Figure 7 yes Figure 6 A schematic partial enlarged view of point A is shown.

[0034] Reference numerals:

[0035] 100-welding pad, 200-power module, 210-heat dissipation substrate, 211-mounting position, 212-connector, 220-DBC, 10-base, 11-first limiting groove, 12-limiting protrusion, 13-positioning hole, 20-first fixing member, 21-positioning groove, 22-second limiting groove, 23-elastic pad, 30-second fixing member, 31-first supporting surface, 40-third fixing member, 41-second supporting surface, 42-protruding portion, 43-move groove, 50-positioning member. DETAILED DESCRIPTION

[0036] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0039] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] Figure 1 This is a schematic structural diagram of a welding pad according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view of a welding pad according to an embodiment of the present invention. Figure 3 This is a schematic structural diagram of a base according to an embodiment of the present utility model. Figure 4 is a schematic structural diagram of a first fixing member according to an embodiment of the present utility model. Figure 5 This is a schematic installation diagram of a welding pad and a power module according to an embodiment of the present invention. Figure 6 is a schematic structural diagram of a power module according to an embodiment of the present utility model. Figure 7 yes Figure 6 A schematic partial enlarged view of point A is shown.

[0041] like Figure 1 As shown, the present invention provides a welding pad 100 for a power module 200. The power module 200 includes a heat dissipation substrate 210 and at least one DBC 220 (see Figure 6 and Figure 7 ), the heat sink substrate 210 is fixedly connected to the DBC 220, and the welding pad 100 is configured to support the DBC 220 of the power module 200 to facilitate power welding between the DBC 220 and electronic components in the power module 200. Here, each power module 200 includes multiple DBCs 220, and each heat sink substrate 210 is provided with multiple mounting slots corresponding to the DBCs 220, and the mounting slots are used to mount the DBCs 220.

[0042] like Figure 1As shown, in this embodiment, the welding pad 100 includes a base 10, a first fixing part 20 and a second fixing part 30. The top of the base 10 is provided with a first limiting groove 11 extending along the first horizontal direction. The first fixing part 20 extends along the second horizontal direction and is located in the first limiting groove 11, and the two ends of the first fixing part 20 are spaced apart from the side surfaces of the first limiting groove 11 so that the first fixing part 20 can move relative to the base 10 along the first horizontal direction. The second horizontal direction is perpendicular to the first horizontal direction. The second fixing part 30 is parallel to the first fixing part 20 and is located in the first limiting groove 11. The top surface of the second fixing part 30 is formed with a first supporting surface 31, which is used to support the heat dissipation substrate 210. The second fixing part 30 is located on one side of the first fixing part 20, and the second fixing part 30 and the top surface of the first fixing part 20 form a positioning groove 21. The positioning groove 21 is used to position the DBC220, and the second fixing part 30 is configured to move along the first horizontal direction toward a side away from the first fixing part 20.

[0043] In this embodiment, by arranging the side surfaces of the limiting groove of the welding pad 100 to be spaced apart from the first fixing member 20 and the second fixing member 30, and arranging the first fixing member 20 and the second fixing member 30 to be movable relative to the base 10 along the first horizontal direction, that is, by moving the first fixing member 20 and the second fixing member 30 along the first horizontal direction, the spacing between the first fixing member 20 and the second fixing member 30 can be adjusted to adapt to the spacing between the heat dissipation substrate 210 and the DBC220 in the power module 200. At the same time, the top surface of the first fixing member 20 and the second fixing member 30 form a positioning groove 21 for positioning the DBC220, which can prevent the DBC220 from moving during welding, thereby improving the adaptability of the welding pad 100 and the power module 200, thereby improving the ease of use of the welding pad 100 while improving the positioning stability of the welding pad 100 on the DBC220, and thereby improving the installation flatness of the DBC220.

[0044] like Figure 2As shown, in a further embodiment, the welding pad 100 further includes a third fixing member 40, which is located on a side of the first fixing member 20 away from the second fixing member 30. The third fixing member 40 is fixedly installed in the first limiting groove 11, and a second supporting surface 41 is formed on the top of the third fixing member 40 for supporting the heat dissipation substrate 210. In this embodiment, the third fixing member 40 is arranged on a side of the first fixing member 20 away from the second fixing member 30, and a second supporting surface 41 is provided on the top of the third fixing member 40, that is, the first supporting surface 31 and the second supporting surface 41 are used to jointly support the heat dissipation substrate 210, and the first supporting surface 31 and the second supporting surface 41 form a positioning groove 21 with the first fixing member 20 to position the DBC 220, thereby improving the stability of the welding pad 100 and ensuring the installation stability of the heat dissipation substrate 210 and the DBC 220.

[0045] like Figure 6 As shown, in a further embodiment, the heat dissipation substrate 210 is provided with a mounting position 211, and the heat dissipation substrate 210 further includes at least one connecting member 212 (refer to Figure 5 ), the connecting member 212 is configured to protrude downward from the top surface of the heat dissipation substrate 210 toward the mounting position 211. The third fixing member 40 further includes at least one clearance groove 43 corresponding to the connecting member 212. The clearance groove 43 is located on a side of the third fixing member 40 adjacent to the first fixing member 20. In this embodiment, the clearance groove 43 is configured to be recessed downward from the second supporting surface 41 toward the side of the third fixing member 40 to cooperate with the connecting member 212 of the heat dissipation substrate 210. This allows the DBC 220 connected to the connecting member 212 to better fit within the positioning groove 21, preventing the connecting member 212 from abutting against the second supporting surface 41 of the third fixing member 40, thereby improving the positioning stability of the DBC 220. Here, each mounting groove of the heat dissipation substrate 210 is provided with a plurality of connecting members 212, the plurality of connecting members 212 of each mounting groove are evenly spaced, and the plurality of connecting members 212 of each mounting groove are connected to the corresponding DBC220, and the number of the make way grooves 43 of each third fixing member 40 is multiple.

[0046] In this embodiment, the connecting member 212 is configured to protrude downward from the top surface of the heat dissipation substrate 210 toward the mounting groove, that is, the bottom surface of the DBC220 is located at the bottom of the bottom surface of the heat dissipation substrate 210. The setting of the yield groove 43 in the third fixing member 40 enables the DBC220 to be completely attached to the positioning groove 21 while avoiding hard contact between the third fixing member 40 and the heat dissipation substrate 210, causing deformation of the heat dissipation substrate 210, thereby avoiding affecting the flatness of the power module 200.

[0047] like Figure 2As shown, in a further embodiment, the third fixing member 40 further includes a protruding portion 42, which extends along the first horizontal direction. The protruding portion 42 is located at the end of the third fixing member 40 adjacent to the first fixing member 20, and is configured to abut against the end of the first fixing member 20. In this embodiment, the protruding portion 42 is disposed between the first fixing member 20 and the side surface of the limiting groove, and is configured to abut against the end of the first fixing member 20, so as to limit the first fixing member 20 and prevent the first fixing member 20 and the third fixing member 40 from being displaced along the second horizontal direction when the first fixing member 20 and the third fixing member 40 are relatively displaced along the first horizontal direction, thereby preventing the positioning groove 21 and the clearance groove 43 from being offset, resulting in the DBC 220 being unable to be installed in the positioning groove 21 or the connector 212 being unable to cooperate with the clearance groove 43. Here, the top surface of the protruding portion 42 is flush with the second supporting surface 41 of the third fixing member 40 , so as to support the heat dissipation substrate 210 and ensure the flatness of the power module 200 .

[0048] like Figure 4 As shown, in a further embodiment, a second limiting groove 22 is provided on the top of the first fixing member 20. The first fixing member 20 also includes an elastic pad 23, which is located in the second limiting groove 22. The elastic pad 23 is used to support the DBC 220. In this embodiment, the elastic pad 23 is disposed in the second limiting groove 22, and the height of the elastic pad 23 is the same as the depth of the second limiting groove 22 to ensure the flatness of the DBC 220. Here, the top surface area of the elastic pad 23 is greater than or equal to the bottom surface area of the DBC 220, so that when the DBC 220 is lowered into the positioning groove 21, its bottom surface can completely fall into the top surface of the elastic pad 23, thereby preventing the DBC 220 from directly contacting the first fixing member 20 and causing it to break.

[0049] In a further embodiment, the elastic pad 23 is made of polyurethane. In this embodiment, the elastic pad 23 is made of polyurethane to enhance its elasticity and resilience, allowing it to quickly recover from the pressure of the DBC 220. Furthermore, the high resilience of the polyurethane material ensures that the elastic pad 23 maintains good support and comfort even after extended use. The polyurethane material also exhibits excellent wear resistance, enabling the elastic pad 23 to withstand wear caused by friction when receiving the DBC 220, thereby extending its service life.

[0050] like Figure 3As shown, in a further embodiment, the base 10 further includes a limiting protrusion 12, which is located on a side of the third fixing member 40 away from the first fixing member 20. The limiting protrusion 12 is used to limit the third fixing member 40 to prevent the third fixing member 40 from shifting when the heat dissipation substrate 210 of the power module 200 moves down to the second support surface 41 of the third fixing member 40, thereby ensuring the stability of the welding pad 100. Here, the side of the third fixing member 40 away from the first fixing member 20 abuts against the side of the limiting protrusion 12 close to the third fixing member 40.

[0051] In this embodiment, the limiting protrusion 12 is configured to limit the third fixing member 40. The connecting member 212 of the power module 200 first positions the heat dissipation substrate 210 through the clearance groove 43. The first fixing member 20 and the second fixing member 30 move along the first horizontal direction toward the side away from the third fixing member 40 according to the relative position of DBC220 and the connecting member 212, so as to adapt the spacing between the first fixing member 20, the second fixing member 30 and the third fixing member 40 of the welding pad 100 to the connecting member 212 of DBC220 and the heat dissipation substrate 210, that is, the welding pad 100 is set to have an adjustable spacing to improve the ease of use of the welding pad 100.

[0052] like Figure 2 As shown, in a further embodiment, a plurality of positioning holes 13 are provided on the top of the base 10, and the welding pad 100 further includes a plurality of positioning members 50 corresponding to the positioning holes 13. The plurality of positioning members 50 are evenly spaced and distributed at both ends of the first fixing member 20 and the second fixing member 30. Each positioning member 50 includes a positioning surface. The positioning member 50 is configured so that after being fixed in the positioning hole 13, its positioning surface abuts against the corresponding first fixing member 20 or second fixing member 30. In this embodiment, the positioning surfaces of the plurality of positioning members 50 abut against the first fixing member 20 and the second fixing member 30, respectively, to position the first fixing member 20 and the second fixing member 30, thereby preventing the first fixing member 20 and the second fixing member 30 carrying the power module 200 from moving, which may cause the power module 200 to be placed unstable, thereby improving the stability of the welding pad 100.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A welding pad for a power module, wherein the power module comprises a heat dissipation substrate and at least one DBC, wherein the heat dissipation substrate is fixedly connected to the DBC, and the welding pad is used to support the power module, characterized in that: The welding pad includes: A base, wherein a first limiting groove extending along a first horizontal direction is provided on the top of the base; a first fixing member extending along a second horizontal direction and located in the first limiting groove, with two ends of the first fixing member spaced from side surfaces of the first limiting groove so that the first fixing member can move relative to the base along the first horizontal direction, the second horizontal direction being perpendicular to the first horizontal direction; The second fixing member is parallel to the first fixing member and is located in the first limiting groove. The top surface of the second fixing member is formed with a first supporting surface, and the supporting surface is used to support the heat dissipation substrate. The second fixing member is located on one side of the first fixing member, and the second fixing member and the top surface of the first fixing member form a positioning groove, and the positioning groove is used to position the DBC. The second fixing member is configured to move along the first horizontal direction toward a side away from the first fixing member.

2. The welding pad according to claim 1, characterized in that: Also includes: The third fixing member is located on a side of the first fixing member away from the second fixing member. The third fixing member is fixedly installed in the first limiting groove. A second supporting surface is formed on the top of the third fixing member for supporting the heat dissipation substrate.

3. The welding pad according to claim 2, characterized in that: The heat dissipation substrate is provided with a mounting position, and the heat dissipation substrate further includes at least one connecting member, the connecting member being configured to protrude downward from the top surface of the heat dissipation substrate toward the mounting position, and the third fixing member further includes: At least one clearance groove corresponding to the connecting member is located on a side of the third fixing member close to the first fixing member.

4. The welding pad according to claim 3, characterized in that: The third fixing member further includes: The protruding portion extends along the first horizontal direction, is located at an end of the third fixing member close to the first fixing member, and is configured to abut against the end of the first fixing member.

5. The welding pad according to claim 4, characterized in that: A second limiting groove is provided on the top of the first fixing member, and the first fixing member further includes: An elastic pad is located in the second limiting groove, and the elastic pad is used to support the DBC.

6. The welding pad according to claim 5, characterized in that: The elastic pad is made of polyurethane material.

7. The welding pad according to claim 6, characterized in that: The base further comprises: The limiting protrusion is located on a side of the third fixing member away from the first fixing member, and the limiting protrusion is used to limit the third fixing member.

8. The welding pad according to any one of claims 1 to 7, characterized in that: The top of the base is provided with a plurality of positioning holes, and the welding pad also includes: Multiple positioning members are arranged corresponding to the positioning holes, and the multiple positioning members are evenly distributed at both ends of the first fixing member and the second fixing member. Each of the positioning members includes a positioning surface. After the positioning member is fixed in the positioning hole, its positioning surface abuts against the corresponding first fixing member or the second fixing member.

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