IPM welding pressing plate

Abstract

The utility model provides an IPM welding pressure plate, and relates to the technical field of chip processing, the IPM welding pressure plate comprises a fixed plate, the fixed plate is provided with an operation window, the operation window comprises an inner wall, and the inner wall is provided with a first pressure claw, a second pressure claw and a third pressure claw; the first pressing claw, the second pressing claw and the third pressing claw extend from the inner wall to the inner side of the operation window, the first pressing claw is used for fixing a pin of the IPM, the second pressing claw is used for fixing a substrate of the IPM, and the third pressing claw is used for fixing a lead frame of the IPM. The first pressing claw is used for fixing the pins, the second pressing claw is used for fixing the substrate, and the third pressing claw is used for fixing the lead frame, so that the stability of the lead frame, the substrate and the pins in the welding process can be effectively maintained, the height uniformity of the pins is ensured, a pressing gap caused by the height difference of the pins is avoided, the pins are prevented from warping and unevenness, and the welding effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of chip processing, in particular to an IPM welding pressing plate. Background Art

[0002] IPM (Intelligent Power Module) is an electronic module that integrates power switching devices (such as IGBT) and drive circuits. The design focus of IPM is to provide efficient power control and conversion. It is suitable for motor control, power conversion, etc. and is widely used in new energy vehicles.

[0003] With the rapid development of the new energy vehicle industry, the demand for IPM is growing, and the performance requirements for IPM are constantly improving. The bonding wires in IPM are gradually changing from traditional gold wires to palladium copper wires, which are cheaper and have better material properties. However, palladium copper wires have high hardness and require higher wire bonding processes. The stability around the coiling area is particularly critical.

[0004] In a clamp for gold wire welding of IPM intelligent power module with Chinese document publication number CN219053360U, the clamp includes a lead frame, a clamp and a clamp, the lead frame is connected to the clamp, the clamp is connected to the clamp, the clamp includes a long clamp and a short clamp, the clamp is provided with a clamp groove, the clamp groove is connected to a high temperature rubber strip, the lead frame is connected to the lower frame base island, and the long clamp is connected to the IGBT chip side frame;

[0005] Although the pressure plate and claw fixture disclosed in the above document can stabilize the lead frame and the base island, it cannot guarantee the consistency of the height and flatness of each pin. As products develop towards high density, high speed and miniaturization, the number of chip pins is increasing and the spacing is getting smaller. The use of an integrated pressing plate cannot guarantee the consistency of the height and flatness of each pin, and can no longer meet the welding requirements. Utility Model Content

[0006] In order to overcome the problems existing in the related art, the purpose of the utility model is to provide an IPM welding plate to solve the problem existing in the prior art that the consistency of the height and flatness of each pin cannot be guaranteed.

[0007] An IPM welding platen, the IPM comprising a lead frame, the lead frame comprising pins and a substrate, the IPM welding platen comprising:

[0008] A fixed plate, wherein an operation window is provided on the fixed plate, wherein the operation window comprises an inner wall, and a first pressing claw, a second pressing claw and a third pressing claw are provided on the inner wall;

[0009] The first pressing claw, the second pressing claw and the third pressing claw all extend from the inner wall to the inner side of the operation window, the first pressing claw is used to fix the pin, the second pressing claw is used to fix the substrate, and the third pressing claw is used to fix the lead frame.

[0010] The pins are fixed by the first pressing claw, the substrate is fixed by the second pressing claw, and the lead frame is fixed by the third pressing claw. This can effectively maintain the stability of the lead frame, substrate and pins during the welding process, ensure the uniformity of the height of the pins, avoid the pressing gap caused by the height difference of the pins, avoid the warping of the pins, and ensure the welding effect.

[0011] Preferably, the first pressing claw is perpendicular to the inner wall.

[0012] The vertical design makes more efficient use of space within the operating window, leaving more room for other clamping jaws and welding operations.

[0013] Preferably, the first pressing claw also includes a first claw body and a first claw head, one end of the first claw body is fixed on the inner wall, and the other end is fixedly connected to the first claw head, the bottom surface of the first claw body is flush with the bottom surface of the fixed plate, the first claw head extends downward from the first claw body, and the first claw head abuts against the pin.

[0014] Preferably, a plurality of the first pressing claws are provided, and each of the first pressing claws fixes one of the pins.

[0015] Each pin is fixed with an independent pressure claw, which can ensure that each pin is precisely controlled to avoid mutual influence, thereby improving the accuracy and stability of welding.

[0016] Preferably, the second pressing claw includes a second claw body and a second claw head, one end of the second claw body is fixed to the inner wall, and the other end extends toward the inside of the operating window to connect to the second claw head, and the second claw head extends obliquely downward to abut against the base plate.

[0017] Preferably, the third pressing claw includes a third claw body and a third claw head, one end of the third claw body is fixed on the inner wall, and the other end extends toward the inside of the operating window to connect to the third claw head, and the third claw head extends obliquely downward to abut against the lead frame.

[0018] Preferably, it also includes a fixed column, which extends from the inner wall to the inner side of the operating window, one side wall of the fixed column is provided with the first pressure claw, and the other side wall of the fixed column is provided with an avoidance slope, and the avoidance slope is inclined from bottom to top toward the inner side of the fixed column.

[0019] Preferably, the pin further includes a soldering pad, and the first claw abuts against the soldering pad.

[0020] The first claw directly applies pressure on the pad, which can ensure good contact between the pad and the bonding wire and improve the welding quality.

[0021] Preferably, the included angle between the axis of the second claw head and the second claw body is 120 degrees, and the included angle between the axis of the third claw head and the third claw body is 120 degrees.

[0022] Preferably, the fixed column is also provided with an avoidance groove, the avoidance groove is arranged between the avoidance slope and the inner wall, the avoidance groove is arranged on one side of the fixed column, the avoidance groove and the avoidance slope are arranged on the same side, and the avoidance groove is bent toward the center of the fixed column.

[0023] The beneficial effects of the utility model are:

[0024] The utility model provides an IPM welding platen, the IPM includes a lead frame, the lead frame includes a pin and a substrate, the IPM welding platen is provided with an operation window on a fixed plate, and a first pressing claw, a second pressing claw, and a third pressing claw are arranged on the inner wall of the operation window. The first pressing claw fixes the pin, the second pressing claw fixes the substrate, and the third pressing claw fixes the lead frame, so that the stability of the lead frame, the substrate, and the pin during the welding process can be effectively maintained, the height uniformity of the pin is ensured, the pressing gap caused by the height difference of the pin is avoided, the pin warping is avoided, and the welding effect is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a top view of an IPM welding platen provided in an embodiment of the utility model;

[0026] Figure 2 It is a top view of the IPM welding platen operating window provided in the embodiment of the utility model;

[0027] Figure 3 is a cross-sectional view of an IPM welding platen operating window provided in an embodiment of the present utility model;

[0028] Figure 4 It is a longitudinal cross-sectional view of the IPM welding platen operating window provided in the embodiment of the utility model;

[0029] Figure 5 It is a perspective view of one side of the IPM welding platen provided in the embodiment of the utility model;

[0030] Figure 6 is a perspective view of the other side of the IPM welding platen provided in the embodiment of the utility model;

[0031] Figure 7 It is a top view of another IPM welding operation window provided in an embodiment of the utility model.

[0032] Reference numerals:

[0033] 100, fixed plate; 110, operating window; 111, inner wall; 200, first pressing claw; 210, first claw body; 220, first claw head; 300, second pressing claw; 310, second claw body; 320, second claw head; 400, third pressing claw; 410, third claw body; 420, third claw head; 500, fixed column; 510, avoidance slope; 520, avoidance groove. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0035] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0036] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] Example 1

[0038] like Figure 1-Figure 6 As shown, this embodiment provides an IPM welding platen, and the IPM welding platen includes:

[0039] A fixed plate 100, wherein an operation window 110 is provided on the fixed plate 100, wherein the operation window 110 comprises an inner wall 111, wherein a first pressing claw 200, a second pressing claw 300 and a third pressing claw 400 are provided on the inner wall 111;

[0040] The first pressing claw 200, the second pressing claw 300 and the third pressing claw 400 all extend from the inner wall 111 to the inner side of the operation window 110. The first pressing claw 200 is used to fix the pins of the IPM, the second pressing claw 300 is used to fix the substrate of the IPM, and the third pressing claw 400 is used to fix the lead frame of the IPM.

[0041] During the bonding process of IPM, one end of the bonding wire is welded to the chip through ultrasonic welding, and the other end is welded to the pad of the pin. In the traditional process, gold wire is used as the bonding wire, and the process requirements for the bonding wire are relatively low. Palladium copper wire is gradually replacing gold wire due to its low price and better material properties. However, palladium copper wire has a higher hardness and higher requirements for the welding process. It is necessary to maintain the stability of each component to be welded during the welding process, especially the stability of the pin.

[0042] The application fixes the pins with the first pressing claw 200, the substrate with the second pressing claw 300, and the lead frame with the third pressing claw 400, which can effectively maintain the stability of the lead frame, substrate and pins during the welding process, ensure the uniformity of the height of the pins, avoid the pressing gap caused by the height difference of the pins, avoid the warping of the pins, and ensure the welding effect.

[0043] Specifically, the operation window 110 can be adjusted according to the IPM to be welded. Providing the operation window 110 on the fixing plate 100 can enable the IPM to be fixed and welded and bonded at the same time.

[0044] More specifically, the first pressing jaw 200 , the second pressing jaw 300 and the third pressing jaw 400 can be adaptively adjusted according to the shape, size and position of the parts to be welded.

[0045] More specifically, the first pressing jaw 200 may be in any shape, such as rectangular, U-shaped, or V-shaped.

[0046] In this embodiment, the first pressing claw 200 is perpendicular to the inner wall 111 .

[0047] The vertical design can more effectively utilize the space within the operating window 110, leaving more space for other pressing jaws and welding operations.

[0048] In this embodiment, the first pressing claw 200 also includes a first claw body 210 and a first claw head 220. One end of the first claw body 210 is fixed to the inner wall 111, and the other end is fixedly connected to the first claw head 220. The bottom surface of the first claw body 210 is flush with the bottom surface of the fixed plate 100. The first claw head 220 extends downward from the first claw body 210, and the first claw head 220 abuts against the pin.

[0049] More specifically, the first claw head 220 and the first claw body 210 may be integrally formed or may be independent modules.

[0050] The manufacturing process of the integrally formed first claw head 220 and first claw body 210 is simpler, which can reduce manufacturing costs, and the integral structure avoids potential weaknesses at the connection, thereby improving the overall strength and durability of the pressure claw. At the same time, the integral design has no gaps, is easier to clean and maintain, and reduces the accumulation of dust and dirt.

[0051] The modular design of the claw body and the claw head allows the claw head to be easily replaced according to different needs. When welding IPMs of different types or sizes, different claw heads can be replaced according to the shape of the pins to improve the adaptability of the pressure plate. At the same time, the shape and size of the claw head can be adjusted to accurately control the pressure applied to the pins to ensure the welding quality.

[0052] In this embodiment, a plurality of first pressing claws 200 are provided, and each of the first pressing claws 200 fixes one of the pins.

[0053] Each pin is fixed with an independent pressure claw, which can ensure that each pin is precisely controlled to avoid mutual influence, thereby improving the accuracy and stability of welding.

[0054] In this embodiment, the second pressing claw 300 includes a second claw body 310 and a second claw head 320. One end of the second claw body 310 is fixed to the inner wall 111, and the other end extends toward the inner side of the operating window 110 to connect with the second claw head 320. The second claw head 320 extends obliquely downward and abuts against the substrate.

[0055] Likewise, the second claw head 320 and the second claw body 310 may be integrally formed or may be independent modules.

[0056] The modular design of the second claw head 320 and the second claw body 310 allows the second pressure claw 300 to be adjusted according to different modules. One end of the claw body is fixed to the inner wall 111 to provide stable support, and the other end extends to the inside of the operating window 110 to connect the claw head, so as to facilitate the adjustment of the position and angle of the claw head.

[0057] The inclined claw head can better fit the surface of the substrate and provide a more stable fixing effect. The design of the claw body extending inward can save space in the operation window 110, leaving more space for other components or operations.

[0058] In this embodiment, the third pressing claw 400 includes a third claw body 410 and a third claw head 420. One end of the third claw body 410 is fixed on the inner wall 111, and the other end extends toward the inner side of the operating window 110 to connect to the third claw head 420. The third claw head 420 extends obliquely downward and abuts against the lead frame.

[0059] Likewise, the third claw head 420 and the third claw body 410 may be integrally formed or may be independent modules.

[0060] The integrally formed third pressing jaw 400 is easier to manufacture and has lower cost. The modular third pressing jaw 400 is more flexible and can adjust the position and angle of the gripping head to adapt to lead frames of different shapes and sizes.

[0061] In this embodiment, a fixed column 500 is also included, which extends from the inner wall 111 to the inner side of the operating window 110, and one side wall of the fixed column 500 is provided with the first pressure claw 200, and the other side wall of the fixed column 500 is provided with an avoidance slope 510, and the avoidance slope 510 is inclined from bottom to top toward the inner side of the fixed column 500.

[0062] Specifically, the fixing column 500 is disposed between two adjacent chips to be welded. Since the pins are usually disposed around the chips to be welded, the pins located between the two adjacent chips to be welded cannot be stably fixed by the first pins disposed on the inner wall 111. According to the design of the IPM pins, the first pressing claw 200 is disposed on the fixing column 500, so that the pins close to the inner side can also be fixed to the same extent.

[0063] The design of the avoidance slope 510 can avoid blocking the ultrasonic welding head during the welding process, thereby ensuring the normal progress of the welding process.

[0064] In this embodiment, the pin further includes a soldering pad, and the first claw 220 abuts against the soldering pad.

[0065] The first claw 220 directly applies pressure on the pad, which can ensure good contact between the pad and the bonding wire, thereby improving the welding quality.

[0066] In this embodiment, the included angle between the axes of the second claw head 320 and the second claw body 310 is 120 degrees, and the included angle between the axes of the third claw head 420 and the third claw body 410 is 120 degrees.

[0067] In this embodiment, an avoidance groove 520 is further provided on the fixed column 500. The avoidance groove 520 is arranged between the avoidance slope 510 and the inner wall 111. The avoidance groove 520 is arranged on one side of the fixed column 500. The avoidance groove 520 and the avoidance slope 510 are arranged on the same side, and the avoidance groove 520 is bent toward the center of the fixed column 500.

[0068] The design of the avoidance groove 520 and the avoidance slope 510 can effectively increase the operating space, ensure the normal progress of the welding process, and avoid the pressure plate from blocking the welding process.

[0069] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An IPM welding platen, characterized in that: include: A fixed plate (100), wherein an operating window (110) is provided on the fixed plate (100), wherein the operating window (110) comprises an inner wall (111), and wherein a first pressing claw (200), a second pressing claw (300) and a third pressing claw (400) are provided on the inner wall (111); The first pressing claw (200), the second pressing claw (300) and the third pressing claw (400) all extend from the inner wall (111) toward the inner side of the operating window (110); the first pressing claw (200) is used to fix the pins of the IPM, the second pressing claw (300) is used to fix the substrate of the IPM, and the third pressing claw (400) is used to fix the lead frame of the IPM.

2. The IPM welding plate according to claim 1, characterized in that: The first pressing claw (200) is perpendicular to the inner wall (111).

3. The IPM welding plate according to claim 2, characterized in that: The first pressing claw (200) further comprises a first claw body (210) and a first claw head (220); one end of the first claw body (210) is fixed to the inner wall (111), and the other end is fixedly connected to the first claw head (220); the bottom surface of the first claw body (210) is flush with the bottom surface of the fixing plate (100); the first claw head (220) extends downward from the first claw body (210), and the first claw head (220) abuts against the pin.

4. The IPM welding plate according to claim 3, characterized in that: A plurality of the first pressing claws (200) are provided, and each of the first pressing claws (200) fixes one of the pins.

5. The IPM welding plate according to claim 4, characterized in that: The second pressing claw (300) comprises a second claw body (310) and a second claw head (320); one end of the second claw body (310) is fixed on the inner wall (111), and the other end extends toward the inner side of the operating window (110) to connect with the second claw head (320); the second claw head (320) extends obliquely downward and abuts against the base plate.

6. The IPM welding plate according to claim 5, characterized in that: The third pressing claw (400) comprises a third claw body (410) and a third claw head (420); one end of the third claw body (410) is fixed on the inner wall (111), and the other end extends toward the inner side of the operating window (110) to connect with the third claw head (420); the third claw head (420) extends obliquely downward to abut against the lead frame.

7. The IPM welding plate according to claim 6, characterized in that: It also includes a fixed column (500), the fixed column (500) extending from the inner wall (111) to the inner side of the operating window (110), one side wall of the fixed column (500) is provided with the first pressing claw (200), and the other side wall of the fixed column (500) is provided with an avoidance slope (510), and the avoidance slope (510) is inclined from bottom to top toward the inner side of the fixed column (500).

8. The IPM welding plate according to claim 7, characterized in that: The pin further comprises a soldering pad, and the first claw (220) abuts against the soldering pad.

9. The IPM welding plate according to claim 8, characterized in that: The included angle between the axes of the second claw head (320) and the second claw body (310) is 120 degrees, and the included angle between the axes of the third claw head (420) and the third claw body (410) is 120 degrees.

10. The IPM welding plate according to claim 9, characterized in that: The fixed column (500) is also provided with an avoidance groove (520), the avoidance groove (520) is arranged between the avoidance inclined surface (510) and the inner wall (111), the avoidance groove (520) is arranged on one side of the fixed column (500), the avoidance groove (520) and the avoidance inclined surface (510) are arranged on the same side, and the avoidance groove (520) is bent toward the center of the fixed column (500).

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