Jig suitable for power module plug-in and its plug-in process

Abstract

The present invention provides a jig suitable for power module plug-in and its plug-in process, belonging to the field of power module packaging technology. The jig includes one or more than two groups of positioning assemblies, a tray, and positioning pins, and any group of positioning assemblies is composed of a metal-clad ceramic substrate positioning plate and a signal terminal positioning plate. The jig of the present invention adopts a split structure, which can avoid reprocessing the plug-in jig when plugging in signal terminals with different layouts. It only needs to replace the metal-clad ceramic substrate positioning plate and the signal terminal positioning plate of the plug-in jig, thereby reducing the time and economic cost of customizing the plug-in jig. The plug-in process of the present invention can reduce welding and other processes, will not affect the bonding process after welding, and can be applicable to the plug-in of metal-clad ceramic substrates with different signal terminal distributions, which is conducive to improving production efficiency and reducing the complexity of component replacement.

Description

Technical Field

[0001] The present invention belongs to the technical field of power module packaging, and in particular relates to a fixture suitable for power module plug-in and a plug-in process thereof, and a packaging process including the plug-in process. Background Art

[0002] During the power module packaging process, the power module terminal welding is completed by welding the terminal and the module together. If an integral signal terminal is used in the welding process, an additional welding step will be added, otherwise it will affect the subsequent bonding process and increase the time cost of production or testing.

[0003] In order to improve the production efficiency of power modules, the inventors, after analysis and research, proposed a fixture and a plug-in process suitable for plugging the signal terminals of the power module with the terminal base combined on the metal-clad ceramic substrate. Summary of the invention

[0004] The present invention aims to address at least one of the deficiencies in the prior art.

[0005] For example, one of the purposes of the present invention is to provide a new type of split plug-in fixture for power modules, and the fixture can plug signal terminals of various power modules with terminal bases combined on a metal-clad ceramic substrate by replacing positioning assemblies.

[0006] One aspect of the present invention provides a jig suitable for power module insertion, the jig comprising:

[0007] One or more than two positioning assemblies, wherein any one of the positioning assemblies is composed of a metal-clad ceramic substrate positioning plate and a signal terminal positioning plate, the metal-clad ceramic substrate positioning plate having a first positioning groove capable of replaceably accommodating a metal-clad ceramic substrate combined with a terminal base in a predetermined layout along a first plane, the signal terminal positioning plate having a through hole and a first positioning hole arranged along a first direction, the through hole being arranged so as to allow a signal terminal to be plugged in to pass through along the first direction, and the layout of the through hole corresponds to the predetermined layout of the terminal base along the first direction, and the first direction is perpendicular to or intersecting the first plane;

[0008] The tray has a second positioning groove and a second positioning hole arranged along the first direction around the second positioning groove, wherein the second positioning groove is arranged to be able to replaceably accommodate the metal-clad ceramic substrate positioning plate in any group of positioning assemblies along a second plane parallel to the first plane;

[0009] a pressing plate configured to be arranged on a side of the signal terminal positioning plate facing away from the tray along a third plane parallel to the first plane, and having a third positioning hole arranged along the first direction; and

[0010] The positioning pin is configured to cooperate with the second positioning hole, the first positioning hole and the third positioning hole so that the tray, the signal terminal positioning plate and the pressure plate can be stacked sequentially in the first direction, and there is a predetermined stroke between the pressure plate and the signal terminal positioning plate that can realize the connection between the signal terminal and the terminal base.

[0011] In an exemplary embodiment of the present invention, all the metal-clad ceramic substrate positioning plates in the one or more than two positioning assemblies have uniform outer dimensions.

[0012] In an exemplary embodiment of the present invention, the jig further includes a handle disposed on the tray for moving the jig.

[0013] In an exemplary embodiment of the present invention, the number of the first positioning hole, the second positioning hole, the third positioning hole and the positioning pins is equal, and all of them are three or more than four.

[0014] Another aspect of the present invention provides a plug-in process for a power module, the plug-in process comprising the steps of:

[0015] According to the predetermined layout of the terminal base combined with the target metal-clad ceramic substrate, a group of positioning assemblies is determined, wherein the signal terminal positioning plate in the positioning assembly has a through hole with a layout corresponding to the predetermined layout along a first direction;

[0016] The target metal-clad ceramic substrate is installed into the first positioning groove of the metal-clad ceramic substrate positioning plate of the positioning assembly, and the corresponding signal terminal to be plugged is inserted into the through hole of the signal terminal positioning plate, and the tray, the signal terminal positioning plate and the pressing plate are stacked in the first direction by assembling the positioning pins with the first positioning hole, the second positioning hole and the third positioning hole, so that the signal terminal to be plugged is located between the pressing plate and the terminal base;

[0017] The pressing plate is pressed toward the signal terminal positioning plate by the predetermined stroke so that the signal terminal is inserted into the terminal base of the target metal-clad ceramic substrate.

[0018] Another aspect of the present invention provides a packaging process for a power module, wherein the packaging process includes the above-mentioned plug-in process.

[0019] The beneficial effects of the present invention include at least one of the following:

[0020] 1. The present invention can provide a split simple plug-in fixture that can be replaced and combined and is suitable for plugging in signal terminals of power modules. When plugging in signal terminals with different layouts, the present invention can avoid re-processing the plug-in fixture. It only needs to replace the metal ceramic substrate positioning plate and the signal terminal positioning plate of the plug-in fixture, thereby reducing the time and economic cost of customizing the plug-in fixture;

[0021] 2. The signal terminal positioning plate and the metal-clad ceramic substrate positioning plate of the present invention are small in size, use less materials, are simple and convenient to operate, and are easy to replace;

[0022] 3. The present invention is suitable for processing the power module plug-in fixture with high processing accuracy, which can better prevent the signal terminal from being offset during plug-in and achieve accurate positioning;

[0023] 4. The present invention adopts a combination of handles and trays, which is convenient and stable to take and move, simple to operate, and improves production efficiency and product quality;

[0024] 5. The plug-in process of the power module of the present invention can reduce welding and other processes, will not affect the bonding process after welding, and can be applied to the plug-in of metal-clad ceramic substrates with different signal terminal distributions, which is beneficial to improving production efficiency and reducing the complexity of component replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The overall structural schematic diagram of an exemplary embodiment of a fixture suitable for power module plugging of the present invention is shown;

[0026] Figure 2A A three-dimensional schematic diagram of a pressing plate is shown;

[0027] Figure 2B Shows Figure 2A A schematic top view of a pressure plate;

[0028] Figure 3A A three-dimensional schematic diagram of a signal terminal positioning plate is shown;

[0029] Figure 3B Shows Figure 3A A schematic top view of a signal terminal positioning plate;

[0030] Figure 4A A three-dimensional schematic diagram of a positioning plate of a copper-clad ceramic substrate is shown;

[0031] Figure 4B Shows Figure 4A A schematic top view of a positioning plate of a copper-clad ceramic substrate;

[0032] Figure 5A A perspective schematic diagram of a tray is shown;

[0033] Figure 5B Shows Figure 5A A schematic top view of a tray;

[0034] Fig. 6A A three-dimensional schematic diagram of a positioning pin is shown;

[0035] Figure 6B Shows Fig. 6A A schematic top view of the positioning pin;

[0036] Figure 7 Shows Figure 1 Schematic diagram of the crimping (or stamping) completion of the jig suitable for power module insertion.

[0037] The following are the descriptions of the reference numerals:

[0038] 1-Press plate

[0039] 2-Signal terminal positioning plate

[0040] 3-Copper clad ceramic substrate

[0041] 4-Copper clad ceramic substrate positioning board

[0042] 5-Stainless steel handle

[0043] 6-Pallet

[0044] 7-Bolt

[0045] 8-Location pin

[0046] 9-Signal terminal base

[0047] 10-Signal terminal DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0050] In addition, in the description of the invention, it should be understood that the orientations or positional relationships indicated by terms such as "top", "bottom", "inside", "outside", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the invention.

[0051] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] In an exemplary embodiment of the present invention, a fixture suitable for power module insertion may be composed of one or more than two sets of positioning assemblies, a tray, a pressing plate, and positioning pins.

[0054] Specifically, any set of positioning assemblies can be composed of a metal-clad ceramic substrate positioning plate and a signal terminal positioning plate.

[0055] The metal-clad ceramic substrate positioning plate may have a first positioning groove that can be arranged along a first plane (e.g., a horizontal plane), and the first positioning groove can detachably accommodate the metal-clad ceramic substrate. For example, the first positioning groove may be a groove having a predetermined depth and a flat bottom. The metal-clad ceramic substrate may be combined with a terminal base in a predetermined layout by means such as welding. Here, the predetermined layout may include the number and distribution of the terminal bases, etc. The metal-clad ceramic substrate may be a copper-clad ceramic substrate (DBC). In addition, the metal-clad ceramic substrate positioning plate may also include one or more first replacement grooves arranged on the edge line (or boundary) of the first positioning groove. For example, the first replacement groove may be a circular hole or a semicircular hole whose center is located on the edge line of the first positioning groove. Providing one or more first replacement grooves is conducive to more convenient and quick installation and / or removal of the metal-clad ceramic substrate in the first positioning groove.

[0056] The signal terminal positioning plate may have a through hole and a first positioning hole arranged along a first direction (for example, a vertical direction), and the through hole is arranged to allow the signal terminal to be plugged in to pass through along the first direction, and the layout of the through hole corresponds to the predetermined layout of the terminal base along the first direction. In other words, the number and / or distribution of the through holes on the signal terminal positioning plate correspond one-to-one to the number and / or distribution of the terminal base. The first direction is usually set to be perpendicular to the first plane. Of course, if the terminal base requires the signal terminal to be inserted in a slightly tilted manner to achieve the plug-in of the two, the first direction may also be obliquely intersecting with the first plane.

[0057] In this exemplary embodiment, more than two groups of positioning assemblies are formed, and the positioning assemblies can be replaced to achieve the connection of metal-clad ceramic substrates with different sizes and / or different terminal base layouts, which is beneficial to reduce the number of components of the fixture and improve the model adaptability range of the fixture.

[0058] The tray has a second positioning groove and a second positioning hole arranged outside the second positioning groove along a first direction (e.g., vertical direction). The second positioning groove is configured to be able to detachably accommodate the metal-clad ceramic substrate positioning plate in any group of selected positioning assemblies. For example, the second positioning groove may be a groove with a predetermined depth and a flat bottom. Of course, the second positioning groove may also be configured to have a fixed size, and the outer dimensions of the metal-clad ceramic substrate positioning plate in any group of positioning assemblies may be set to have a uniform outer size, which is conducive to further reducing the number of components. The second positioning hole may be a through hole or a semi-blind hole with one end away from the signal terminal positioning plate being sealed. In addition, the tray may also include one or more second replacement grooves arranged on the edge (or boundary) of the second positioning groove. For example, the second replacement groove may be a circular hole or a semicircular hole whose center is located on the edge of the second positioning groove. The provision of one or more second replacement grooves is conducive to more convenient and quick installation and / or removal of the metal-clad ceramic substrate positioning plate in the second positioning groove. In addition, the fixture also includes a handle arranged on the tray for moving the fixture, which is more conducive to the movement and transportation of the fixture. For example, handles may be provided at both ends of the fixture.

[0059] The pressing plate is configured to be disposed on a side (eg, an upper surface area) of the signal terminal positioning plate facing away from the tray, and has a third positioning hole disposed along a first direction (eg, a vertical direction).

[0060] The positioning pin is configured to cooperate with the second positioning hole, the first positioning hole and the third positioning hole, so that the tray, the signal terminal positioning plate and the pressure plate can be stacked in sequence in a first direction (e.g., vertical direction), and a predetermined stroke capable of plugging the signal terminal with the terminal base is formed between the pressure plate and the signal terminal positioning plate. For example, the predetermined stroke may be equal to or slightly greater than the length of the signal terminal and the terminal base that is reduced due to plugging. For example, in a stacked (also referred to as an assembled) state, the predetermined stroke may be supported by a section (e.g., an upper section) of the positioning pin located between the signal terminal positioning plate and the pressure plate and an end (e.g., an upper end) of the signal terminal away from the terminal base. Here, the number of the first positioning hole, the second positioning hole, the third positioning hole and the positioning pin is preferably equal, and the number may be three or more than four. In addition, the positioning pin may also be composed of a first section and a second section connected to each other, wherein the second section can be installed and fixed in the second positioning hole in a manner such as an interference fit; and the first section can pass through the first positioning hole and the third positioning hole in sequence.

[0061] In another exemplary embodiment of the present invention, the jig for power module plugging can further include a stamping mechanism based on the structure of the above exemplary embodiment. The stamping mechanism can be combined with the pressing plate and provide a driving force along the first direction to the pressing plate, which helps the pressing plate to push the signal terminal to complete a predetermined stroke in a mechanical and automated manner.

[0062] Figure 1 The figure shows the overall structure of an exemplary embodiment of a jig suitable for power module insertion of the present invention.

[0063] In this example, if Figure 1 As shown, the fixture suitable for power module plug-in includes a pressing plate 1, a signal terminal positioning plate 2, a copper-clad ceramic substrate positioning plate 4, a tray 6, and a positioning pin 8.

[0064] The pressing plate 1 is configured to be disposed on the upper surface area of ​​the signal terminal positioning plate facing away from the tray.

[0065] The signal terminal positioning plate 2 and the copper-clad ceramic substrate positioning plate 4 form a set of positioning components, which are configured to be arranged under the lower surface area of ​​the pressing plate.

[0066] The tray 6 is arranged at the bottom of the jig for assembling the signal terminal base 9 and the signal terminal 10. The jig also includes a stainless steel handle 5 arranged on the tray for moving the jig, which is more conducive to the movement and transportation of the jig. The handle can be arranged at both ends of the jig and is used to be fixed at both ends of the jig in conjunction with the bolt 7.

[0067] The positioning pin 8 is configured to cooperate with the second positioning hole, the first positioning hole and the third positioning hole so that the tray, the signal terminal positioning plate and the pressure plate can be stacked in sequence in the vertical direction, and a predetermined stroke is formed between the pressure plate and the signal terminal positioning plate to enable the signal terminal to be plugged into the terminal base.

[0068] Figure 2A A schematic diagram of a pressure plate is shown; Figure 2B Shows Figure 2A Schematic top view of .

[0069] like Figure 2A and Figure 2B As shown, the pressing plate has a third positioning hole arranged along the vertical direction.

[0070] Figure 3A A schematic diagram of a signal terminal positioning plate is shown; Figure 3B Shows Figure 3A Schematic top view of .

[0071] like Figure 3A and Figure 3B As shown, the signal terminal positioning plate has a through hole and a first positioning hole arranged in the vertical direction, the through hole is arranged to allow the signal terminal to be plugged in to pass through in the vertical direction, and the layout of the through hole corresponds to the predetermined layout of the terminal base in the vertical direction. The number and / or distribution of the through holes on the signal terminal positioning plate correspond to the number and / or distribution of the terminal base.

[0072] Figure 4A A schematic diagram of a copper-clad ceramic substrate positioning plate is shown; Figure 4B Shows Figure 4A Schematic top view of .

[0073] like Figure 4A and Figure 4B As shown, the copper-clad ceramic substrate positioning plate has a first positioning groove that can be arranged along a horizontal plane, and the first positioning groove can detachably accommodate the copper-clad ceramic substrate 3. The first positioning groove is a groove with a predetermined depth and a flat bottom. In addition, the copper-clad ceramic substrate positioning plate includes one or more first replacement grooves arranged on the edge line (or boundary) of the first positioning groove. The first replacement groove is a circular hole or a semicircular hole whose center is located on the edge line of the first positioning groove.

[0074] Figure 5A A schematic diagram of a pallet is shown; Figure 5B Shows Figure 5A Schematic top view of .

[0075] like Figure 5A and Figure 5BAs shown, the tray has a second positioning groove and a second positioning hole arranged outside the second positioning groove in the vertical direction. The second positioning groove can be a groove with a predetermined depth and a flat bottom. The second positioning hole is a through hole or a semi-blind hole with one end away from the signal terminal positioning plate being sealed. In addition, the tray also includes one or more second replacement grooves arranged on the edge line (or boundary) of the second positioning groove. The second replacement groove is a circular hole or a semicircular hole with its center located on the edge line of the second positioning groove.

[0076] Fig. 6A A schematic diagram of a positioning pin is shown; Figure 6B Shows Fig. 6A Schematic diagram from top view.

[0077] like Fig. 6A and Figure 6B As shown, the positioning pin is configured to be able to cooperate with the second positioning hole, the first positioning hole and the third positioning hole, so that the tray, the signal terminal positioning plate and the pressure plate can be stacked in sequence in the vertical direction, and a predetermined stroke capable of plugging the signal terminal with the terminal base is formed between the pressure plate and the signal terminal positioning plate. The positioning pin can also be composed of a first section and a second section connected to each other, wherein the second section can be installed and fixed in the second positioning hole in a manner such as interference fit; and the first section can pass through the first positioning hole and the third positioning hole in sequence.

[0078] Example - Power module plug-in process

[0079] In another exemplary embodiment of the present invention, the plug-in process of the power module is implemented by using any one of the jigs suitable for power module plug-in as shown above. Figure 7 A schematic diagram showing the completion of the plugging of a jig suitable for power module plugging according to the present invention is shown.

[0080] Specifically, the plug-in process may include the following steps:

[0081] According to a predetermined layout (e.g., quantity and / or distribution) of the terminal bases to which the target metal-clad ceramic substrate is attached, a group of positioning assemblies is determined, wherein the signal terminal positioning plates in the positioning assemblies have through holes whose layout (e.g., quantity and / or distribution) corresponds to the predetermined layout along a first direction;

[0082] The target metal-clad ceramic substrate is installed into the first positioning groove of the metal-clad ceramic substrate positioning plate of the positioning assembly, and the corresponding signal terminal to be plugged is inserted into the through hole of the signal terminal positioning plate, and the tray, the signal terminal positioning plate and the pressing plate are stacked in a first direction (e.g., vertical direction) by assembling the positioning pins with the first positioning hole, the second positioning hole and the third positioning hole, so that the signal terminal to be plugged is located between the pressing plate and the terminal base;

[0083] The pressing plate is punched toward the signal terminal positioning plate along a first direction by a predetermined stroke so that the signal terminal is inserted into the terminal base of the target metal-clad ceramic substrate. The punching step can be implemented manually or automatically.

[0084] In summary, the present invention can provide a replaceable and combined split simple plug-in fixture suitable for plugging in signal terminals of power modules. When plugging in signal terminals with different layouts, the present invention can avoid re-processing the plug-in fixture, and only needs to replace the metal-clad ceramic substrate positioning plate and the signal terminal positioning plate of the plug-in fixture, thereby reducing the time and economic cost of customizing the plug-in fixture. In addition, the plug-in process of the power module of the present invention can reduce welding and other processes, will not affect the bonding process after welding, and can be applicable to the plug-in of metal-clad ceramic substrates with different signal terminal distributions, which is conducive to improving production efficiency and reducing the complexity of component replacement.

[0085] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A fixture suitable for power module plug-in, characterized in that: The fixture includes: a tray, a pressure plate, a positioning pin and one or more positioning assemblies. Wherein, any one of the positioning assemblies is composed of a metal-clad ceramic substrate positioning plate and a signal terminal positioning plate, the metal-clad ceramic substrate positioning plate has a first positioning groove capable of replaceably accommodating a metal-clad ceramic substrate combined with a terminal base in a predetermined layout along a first plane, the signal terminal positioning plate has a through hole and a first positioning hole arranged along a first direction, the through hole is arranged to allow the signal terminal to be plugged to pass through along the first direction, and the layout of the through hole corresponds to the predetermined layout of the terminal base along the first direction, and the first direction is perpendicular to or intersecting the first plane; The tray has a second positioning groove and a second positioning hole arranged along the first direction around the second positioning groove, wherein the second positioning groove is arranged to be able to replaceably accommodate the metal-clad ceramic substrate positioning plate in any group of positioning assemblies along a second plane parallel to the first plane; The metal-clad ceramic substrate positioning plate further includes one or more first component replacement grooves arranged on the edge line of the first positioning groove, and the tray further includes one or more second component replacement grooves arranged on the edge line of the second positioning groove; The pressing plate is configured to be arranged on a side of the signal terminal positioning plate facing away from the tray along a third plane parallel to the first plane, and has a third positioning hole arranged along the first direction; The positioning pin is configured to cooperate with the second positioning hole, the first positioning hole and the third positioning hole so that the tray, the signal terminal positioning plate and the pressure plate can be stacked sequentially in the first direction, and there is a predetermined stroke between the pressure plate and the signal terminal positioning plate that can realize the insertion of the signal terminal with the terminal base.

2. The jig for power module insertion according to claim 1, characterized in that: The terminal base is formed on the metal-clad ceramic substrate by welding and has an insertion interface for inserting a signal terminal.

3. The jig for power module insertion according to claim 1, characterized in that: The positioning pin includes a first section and a second section connected to each other, the second section can be installed and fixed in the second positioning hole, and the first section can pass through the first positioning hole and the third positioning hole in sequence.

4. A power module plug-in process, characterized in that: The process is implemented by using a jig suitable for power module insertion as described in any one of claims 1 to 3; The plug-in process comprises the following steps: According to the predetermined layout of the terminal base combined with the target metal-clad ceramic substrate, a group of positioning assemblies is determined, wherein the signal terminal positioning plate in the positioning assembly has a through hole with a layout corresponding to the predetermined layout along a first direction; The target metal-clad ceramic substrate is installed into the first positioning groove of the metal-clad ceramic substrate positioning plate of the positioning assembly, and the corresponding signal terminal to be plugged is inserted into the through hole of the signal terminal positioning plate, and the tray, the signal terminal positioning plate and the pressing plate are stacked in the first direction by assembling the positioning pins with the first positioning hole, the second positioning hole and the third positioning hole, so that the signal terminal to be plugged is located between the pressing plate and the terminal base; The pressing plate is pressed toward the signal terminal positioning plate by the predetermined stroke so that the signal terminal is inserted into the terminal base of the target metal-clad ceramic substrate.

5. A packaging process for a power module, characterized in that: The packaging process includes the plug-in process as claimed in claim 4.

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