Terminal packaging jig and packaging method of power module

Abstract

The invention relates to a terminal packaging jig and a packaging method of a power module, the terminal packaging jig is used for the power module, the power module comprises a substrate, a plastic package shell, an electronic component and a first cylinder, the electronic component and the first cylinder are welded on the substrate, the upper end of the plastic package shell is not lower than the upper end of the first cylinder, and a terminal can be inserted into the first cylinder; the terminal packaging jig comprises a first part and a second part. The first part is arranged at the upper end of the first cylinder to seal the upper end opening of the first cylinder, so that part of sealing material is prevented from entering the first cylinder, and the terminal is ensured not to be influenced by the sealing material when being inserted into the opening. The second part is sleeved outside the first cylinder, and the lower end of the second part is lower than the position of the lower end of the terminal inserted into the first cylinder, so that the volume of the plastic package shell in direct contact with the side surface of the part of the first cylinder inserted into the terminal is reduced, extrusion of a large number of plastic package shells on the side surface of the first cylinder is avoided, and smooth insertion of the terminal is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor packaging structures, and in particular to a terminal packaging jig and a packaging method for a power module. Background Art

[0002] like Figure 1 As shown, the power module is mainly composed of a metal base plate 3, a welding layer, a substrate 4, a chip 51, a binding wire 52 or a lead frame, a terminal 8 and a plastic shell 6. When the power module is plastic-sealed, a first cylinder 7 is usually welded on the substrate 4 for the terminal 8 to be inserted into. After the substrate 4, the chip 51 and other electronic components and the first cylinder 7 are plastic-sealed, the surface of the plastic-sealed module is ground, and finally the terminal 8 is inserted into the first cylinder 7. The first cylinder 7 is usually made of copper. If the wall thickness of the first cylinder 7 is thin, it is easy to be squeezed by the sealing material during the plastic sealing process, causing the first cylinder 7 to deform, making it difficult to insert the terminal into the first cylinder 7 later.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of the deficiencies of the prior art, the embodiments of the present invention disclose a terminal packaging jig and a packaging method for a power module to solve the problem that when the power module is plastic-sealed, the first cylinder is easily squeezed and deformed by the sealing material, resulting in the inability to insert the terminal.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A terminal packaging jig is used for a power module, the power module includes a substrate, a plastic shell, electronic components welded on the substrate and a first cylinder, the upper end of the plastic shell is not lower than the upper end of the first cylinder, and the terminal can be inserted into the first cylinder; the terminal packaging jig includes: a first part, which is arranged at the upper end of the first cylinder and closes the upper end opening of the first cylinder; a second part, which is arranged at the lower end of the first part and is a hollow structure, which is sleeved on the outside of the first cylinder, and the lower end is lower than the position of the lower end of the terminal after being inserted into the first cylinder, so as to reduce the volume of the plastic shell that is in direct contact with the side of the first cylinder where the terminal is inserted; wherein the plastic shell at least seals the substrate, electronic components and the second part, and a release material is provided at the contact portion between the first part and the second part and the plastic shell.

[0007] Its further technical solution is that the first part includes a plate body, which covers the upper end of the first cylinder, the plate body is located at the upper end of the plastic packaging shell, and a release film is arranged on the lower surface; the second part includes a second cylinder, the second cylinder is connected to the lower end of the plate body, is sleeved on the outside of the first cylinder, a release film is arranged on the lower surface and the side surface, and the lower end of the second cylinder does not contact the surface of the substrate; the plate body and the second cylinder are integrally formed and made of steel; wherein the plastic packaging shell plastic-seals the second cylinder and the lower end of the side surface of the first cylinder.

[0008] Its further technical solution is that the first part includes a first sealing plug; the second part includes a first sealing ring, the first sealing ring is connected to the outer side of the lower end of the first sealing plug, and is sleeved on the outer side of the first cylinder; the first sealing plug and the first sealing ring are integrally formed and made of soft high-temperature resistant release material; wherein the plastic shell seals the first sealing plug, the first sealing ring and the first cylinder without inserting the terminal part.

[0009] Its further technical solution is that the first part includes a second sealing plug, the lower end of which is clamped with the first cylinder and is made of soft, high-temperature resistant release material; the second part includes a third cylinder, which is arranged at the lower end of the second sealing plug, sleeved on the outside of the first cylinder, made of the same material or steel as the first cylinder, and fixedly connected to the substrate at the lower end; wherein the outer diameter of the second sealing plug is not less than the outer diameter of the third cylinder, and the plastic shell seals the second sealing plug and the third cylinder.

[0010] A further technical solution is that a sealing block is provided at the lower end of the second sealing plug, and the sealing block is inserted into the first cylinder.

[0011] A further technical solution is that the first part includes a second sealing ring arranged on the outer side of the lower end of the second sealing plug, the second sealing ring is sleeved on the outer side of the third cylinder, and the second sealing plug and the second sealing ring are integrally formed.

[0012] A further technical solution is that the outer upper end of the third cylinder has a second outer edge, or the outer lower end has a second outer edge, or the outer upper end and the outer lower end have a second outer edge.

[0013] A further technical solution is that the upper and lower ends of the outer side of the first cylinder have a first outer edge.

[0014] The present invention also discloses a packaging method for a power module, comprising the following steps:

[0015] The second part is sleeved on the outside of the first cylinder, so that the lower end of the second part is lower than the position after the lower end of the terminal is inserted into the first cylinder, and the first part is arranged on the upper end of the first cylinder to close the upper end opening of the first cylinder, thereby completing the assembly of the terminal packaging jig and the pre-packaged body;

[0016] Invert the terminal packaging jig and the pre-packaged body and place them into the plastic packaging mold;

[0017] Close the mold, inject sealing material, and plastic seal the mold;

[0018] Take out the plastic-sealed power module, and at least remove the first part of the terminal packaging jig to open the first cylinder;

[0019] Insert the terminal into the first barrel.

[0020] A further technical solution is that after the step of taking out the plastic-sealed power module and removing at least the first part of the jig to open the first cylinder, it also includes the step of injecting sealing material into the side cavity of the first cylinder and curing it into shape.

[0021] The beneficial effects of the embodiments of the present invention are as follows:

[0022] (1) The terminal packaging jig of the present invention, by arranging the first part at the upper end of the first cylinder to close the opening at the upper end of the first cylinder, prevents part of the sealing material from entering the first cylinder, and ensures that the terminal is not affected by the sealing material when inserted into the opening. By arranging the second part on the outside of the first cylinder with the lower end lower than the position after the lower end of the terminal is inserted into the first cylinder, the volume of the plastic shell that is in direct contact with the side of the first cylinder where the terminal is inserted is reduced, and the side of the first cylinder is prevented from being squeezed by a large amount of plastic shell. The terminal is ensured to be smoothly inserted. By arranging the contact parts of the first and second parts with the plastic shell to use release material, the first and second parts are easy to demold from the sealing material and can be recycled.

[0023] (ii) Furthermore, when the lower end of the second cylinder is not in contact with the surface of the substrate, the first cylinder is only wrapped by a small amount of plastic shell after plastic sealing, which can not only strengthen the first cylinder, but also prevent a large amount of plastic shell from squeezing the side of the first cylinder and affecting the terminal insertion.

[0024] (III) Furthermore, by using a soft, high-temperature resistant release material to make the first sealing plug and the first sealing ring, the softness can form a tight seal on the upper surface and side of the first cylinder under the extrusion pressure during the injection molding of the plastic shell and the extrusion pressure of the plastic mold, avoiding a large amount of plastic shells directly squeezing the side of the first cylinder where the terminal is inserted, affecting the insertion of the terminal. Its high-temperature resistant property ensures that the packaging jig does not fail during the plastic sealing process, and its release force ensures that the packaging jig is demolded from the plastic shell after plastic sealing and can be recycled.

[0025] (iv) Furthermore, by sleeve-mounting a third cylinder outside the first cylinder and clamping a second sealing plug on the first cylinder, the plastic package shell is isolated from contacting the side surface of the first cylinder. The extrusion force during injection molding of the plastic package shell is borne by the third cylinder, thereby avoiding direct extrusion of the plastic package shell on the side surface of the first cylinder and ensuring smooth insertion of the terminal.

[0026] (V) The power module packaging method of the present invention adopts a first part to close the upper end opening of the first cylinder, and a second part is sleeved on the outside of the first cylinder with the lower end lower than the position after the lower end of the terminal is inserted into the first cylinder, so as to reduce the volume of the plastic shell that is in direct contact with the side of the first cylinder where the terminal is inserted. After the plastic packaging, the first part is directly removed to open the opening of the first cylinder, and the terminal is inserted into the first cylinder to complete the plastic packaging of the power module. The operation is convenient, the steps are simple, the power module production efficiency is high, and the yield rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a power module in the prior art.

[0028] Figure 2 It is a schematic structural diagram of a terminal packaging jig according to the first embodiment of the present invention.

[0029] Figure 3 FIG. 1 is a diagram of the plastic-sealed state of the power module according to the first embodiment of the present invention.

[0030] Figure 4 FIG. 1 is a schematic diagram of the structure of a plastic-encapsulated power module according to the first embodiment of the present invention.

[0031] Figure 5 It is a schematic structural diagram of a terminal packaging jig according to a second embodiment of the present invention.

[0032] Figure 6 FIG. 4 is a diagram of the plastic packaging state of the power module according to the second embodiment of the present invention.

[0033] Figure 7 FIG. 1 is a schematic structural diagram of a plastic-encapsulated power module according to a second embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the structure of a terminal packaging jig according to a third embodiment of the present invention.

[0035] Fig. 9 It is a schematic structural diagram of a terminal packaging jig according to a third embodiment of the present invention, in which the lower end of the outer side of the third cylinder has a second outer edge.

[0036] Fig.10 It is a schematic structural diagram of a terminal packaging jig according to a third embodiment of the present invention, in which the upper and lower ends of the outer side of the third cylinder have second outer edges.

[0037] Fig.11 It is a schematic structural diagram of a terminal packaging jig according to a third embodiment of the present invention, in which a second sealing ring is provided at the lower end of a second sealing plug.

[0038] Fig.12 FIG. 4 is a diagram of the plastic-sealed state of the power module according to the third embodiment of the present invention.

[0039] Fig.13 FIG. 4 is a schematic structural diagram of a plastic-encapsulated power module according to a third embodiment of the present invention.

[0040] Fig.14 The figure is a flow chart of the packaging method of the power module of the present invention.

[0041] In the figure:

[0042] 1. First part; 11. Plate body; 12. First sealing plug; 13. Second sealing plug; 131. Sealing block; 132. Second sealing ring; 2. Second part; 21. Second cylinder; 22. First sealing ring; 23. Third cylinder; 231. Second outer edge; 3. Metal base plate; 4. Substrate; 5. Electronic components; 51. Chip; 52. Binding wire; 6. Plastic package shell; 61. Cavity; 7. First cylinder; 71. First outer edge; 8. Terminal; 91. Upper mold; 92. Lower mold; 921. Groove. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0045] First embodiment:

[0046] This embodiment discloses a terminal packaging jig.

[0047] like Figure 2As shown, the terminal packaging jig is used for a power module, which includes a metal base plate 3, a substrate 4, a plastic shell 6, and an electronic component 5 and a first cylinder 7 welded on the substrate 4. The upper end of the plastic shell 6 is not lower than the upper end of the first cylinder 7, and the terminal 8 can be inserted into the first cylinder 7. Exemplarily, the height of the plastic shell 6 can be adjusted and cut according to needs. The electronic component 5 includes a chip 51 and a binding wire 52. The first cylinder 7 is made of copper and has a plurality of copper layers welded to the surface of the substrate 4. The upper and lower ends of the outer side of the first cylinder 7 have a first outer edge 71. The first outer edge 71 at the lower end improves the welding strength between the first cylinder 7 and the substrate 4, and the first outer edge 71 at the upper end facilitates the placement and removal of the first cylinder 7 when it is mounted.

[0048] like Figure 2 As shown, the terminal packaging jig includes a first part 1 and a second part 2. The first part 1 is arranged at the upper end of the first cylinder 7 to close the upper end opening of the first cylinder 7. The second part 2 is arranged at the lower end of the first part 1, and is a hollow structure, which is sleeved on the outside of the first cylinder 7, and the lower end is lower than the position after the lower end of the terminal 8 is inserted into the first cylinder 7. Among them, the plastic shell 6 at least plastic-seales the metal bottom plate 3, the substrate 4, the electronic components 5 and the second part 2, and the contact parts of the first part 1 and the second part 2 with the plastic shell 6 are provided with release material.

[0049] Exemplarily, the first part 1 includes a plate body 11, and the plate body 11 covers the upper end of the first cylinder 7 to close the upper end opening of the first cylinder 7. The second part 2 includes a second cylinder 21, and the second cylinder 21 is connected to the lower end of the plate body 11, and is sleeved on the outside of the first cylinder 7, and the lower end of the second cylinder 21 does not contact the surface of the substrate 4. The plate body 11 and the second cylinder 21 are integrally formed and made of steel. Among them, the plastic shell 6 plastic-seales the metal bottom plate 3, the substrate 4, the electronic components 5, the second cylinder 21 and the lower end of the side of the first cylinder 7, the plate body 11 is located at the upper end of the plastic shell 6, and a release film is set on the lower surface of the plate body 11, and a release film is set on the lower surface and side of the second cylinder 21. Specifically, the release material can be polytetrafluoroethylene, silicone rubber, zirconium oxide or polypropylene. Of course, in other embodiments of the present invention, the lower end of the second barrel 21 can contact the surface of the substrate 4, as long as it can reduce the volume of the plastic shell 6 that is in direct contact with the side of the first barrel 7 where the terminal 8 is inserted, and the present invention does not impose further restrictions on this.

[0050] In this embodiment, by setting the first part 1 at the upper end of the first cylinder 7 to close the upper end opening of the first cylinder 7, part of the sealing material is prevented from entering the first cylinder 7, so as to ensure that the terminal 8 is not affected by the sealing material when inserted into the opening. By setting the second part 2 on the outside of the first cylinder 7 and the lower end being lower than the position after the lower end of the terminal 8 is inserted into the first cylinder 7, the volume of the plastic shell 6 directly contacting the side of the first cylinder 7 where the terminal 8 is inserted is reduced, and a large amount of plastic shell 6 is prevented from squeezing the side of the first cylinder 7, so as to ensure smooth insertion of the terminal 8. By setting the contact parts of the first part 1 and the second part 2 with the plastic shell 6 to use release material, it is convenient for the first part 1 and the second part 2 to be demolded from the sealing material, and can be recycled.

[0051] In addition, when the lower end of the second cylinder 21 is not in contact with the surface of the substrate 4, the first cylinder 7 is only wrapped by a small amount of plastic shell 6 after plastic sealing, which can not only reinforce the first cylinder 7, but also avoid a large amount of plastic shell 6 squeezing the side of the first cylinder 7 and affecting the insertion of the terminal 8.

[0052] Second embodiment:

[0053] Based on the first embodiment, the second embodiment further optimizes and refines the first part 1 and the second part 2.

[0054] like Figure 5 As shown, the first part 1 includes a first sealing plug 12. The second part 2 includes a first sealing ring 22, which is connected to the outer side of the lower end of the first sealing plug 12 and is sleeved on the outer side of the first cylinder 7. The first sealing plug 12 and the first sealing ring 22 are integrally formed and made of a soft, high-temperature resistant release material. Exemplarily, the inner diameter of the first sealing ring 22 is equal to or less than the outer diameter of the first sleeve. Since the first sealing ring 22 is soft, the first outer edge 71 can be inserted between the first sealing plug 12 and the first sealing ring 22 and the first sealing ring 22 can still wrap the side of the first cylinder 7. The plastic shell 6 plastic-encapsulates the metal bottom plate 3, the substrate 4, the electronic components 5, the first sealing plug 12, the first sealing ring 22 and the part of the first cylinder 7 that is not inserted into the terminal 8.

[0055] In this embodiment, the first sealing plug 12 and the first sealing ring are made of a soft, high-temperature resistant release material. The softness of the material can form a tight seal on the upper surface and side of the first cylinder 7 under the extrusion pressure of the plastic shell 6 during injection molding and the extrusion pressure of the plastic mold, thereby preventing a large amount of plastic shell 6 from directly extruding the side of the first cylinder 7 where the terminal 8 is inserted, thereby affecting the insertion of the terminal 8. The high-temperature resistant property ensures that the packaging jig does not fail during the plastic packaging process, and the release force ensures that the packaging jig is demolded from the plastic shell 6 after plastic packaging, and can be recycled.

[0056] Third embodiment:

[0057] Based on the first embodiment, the third embodiment further optimizes and refines the first part 1 and the second part 2 .

[0058] like Figure 8 As shown, the first part 1 includes a second sealing plug 13, the lower end of which is clamped with the first cylinder 7 and is made of soft high temperature resistant release material. The second part 2 includes a third cylinder 23, which is arranged at the lower end of the second sealing plug 13, sleeved on the outside of the first cylinder 7, and fixedly connected to the substrate 4 at the lower end. The outer diameter of the second sealing plug 13 is not less than the outer diameter of the third cylinder 23. Exemplarily, the lower end of the second sealing plug 13 has a sealing block 131, which is clamped into the first cylinder 7 to position the second sealing plug 13 relative to the first cylinder 7. The third cylinder 23 is made of the same material or steel as the first cylinder, and the lower end is welded to the substrate 4. Among them, the outer diameter of the second sealing plug 13 is not less than the outer diameter of the third cylinder 23, and the plastic shell 6 plastic seals the metal bottom plate 3, the substrate 4, the electronic components 5, the second sealing plug 13 and the third cylinder 23.

[0059] like Fig. 9 and Fig.10 As shown, further, the third cylinder 23 has a second outer edge 231 at the outer upper end, or the outer lower end, or the outer upper and lower ends have second outer edges 231, the second outer edge 231 at the lower end facilitates the welding connection between the third cylinder 23 and the substrate 4, and the second outer edge 231 at the upper end facilitates the placement and removal of the third cylinder 23 during mounting. The inner diameter of the third cylinder 23 is not less than the outer diameter of the first cylinder 7.

[0060] like Fig.11 As shown, preferably, the lower end of the second sealing plug 13 has a second sealing ring 132 on the outer side, and the second sealing ring 132 is sleeved on the outer side of the third cylinder 23. The second sealing ring 132 is integrally formed with the second sealing plug 13. Due to its softness, a tight seal is formed on the upper surface and side of the third cylinder 23 under the extrusion pressure of the plastic package shell 6 and the extrusion pressure of the plastic package mold, preventing the sealing material from entering between the third cylinder 23 and the first cylinder 7 and entering into the first cylinder 7, affecting the insertion of the terminal 8.

[0061] In this embodiment, a third cylinder 23 is sleeved on the outside of the first cylinder 7, and a second sealing plug 13 is clamped on the first cylinder 7 to isolate the plastic shell 6 from contacting the side of the first cylinder 7. The extrusion force during injection molding of the plastic shell 6 is borne by the third cylinder 23, thereby avoiding direct extrusion of the plastic shell 6 on the side of the first cylinder 7 and ensuring smooth insertion of the terminal 8.

[0062] Fourth embodiment:

[0063] like Fig.14 As shown, this embodiment discloses a packaging method for a power module, comprising the following steps:

[0064] Step S1, sleeve the second part 2 on the outside of the first cylinder 7, so that the lower end of the second part 2 is lower than the position after the lower end of the terminal 8 is inserted into the first cylinder 7, and the first part 1 is set on the upper end of the first cylinder 7 to close the upper end opening of the first cylinder 7, completing the assembly of the terminal packaging jig and the pre-packaged body.

[0065] Specifically, the pre-packaged body is only missing the plastic package 6 compared to the power module, and the rest of the structure is the same.

[0066] Step S2, inverting the terminal packaging jig and the pre-packaged body and placing them into a plastic packaging mold.

[0067] like Figure 3 , Figure 6 and Fig.12 As shown, specifically, the lower mold 92 has a groove 921 inside. After the terminal packaging jig and the pre-packaged body are assembled, they are inverted and placed in the groove 921. The original upper surface of the first part 1 contacts the bottom of the groove 921, and the metal base plate 3 abuts against the upper mold 91.

[0068] Step S3, closing the mold, injecting sealing material, and plastic sealing.

[0069] like Figure 3 , Figure 6 and Fig.12 As shown, specifically, the lower mold 92 and the upper mold 91 are clamped to generate extrusion pressure between the first part 1 and the upper surface of the first cylinder 7. The sealing material is heated and melted, and injected into the groove 921 in a low viscosity state. The injection pressure is always maintained during the curing process of the sealing material, but the extrusion pressure between the first part 1 and the upper surface of the first cylinder 7 is greater than the injection pressure to ensure that the sealing material does not flow into the first cylinder 7 until the sealing material is cured to form the plastic package 6.

[0070] Step S4 , taking out the plastic-sealed power module, at least removing the first part 1 of the terminal packaging jig to open the first cylinder 7 .

[0071] like Figure 4 , Figure 7 and Fig.13 Specifically, if the terminal encapsulation jig is of the structure of the first embodiment and the second embodiment, the first part 1 and the second part 2 of the entire terminal encapsulation jig are removed at the same time. If the terminal encapsulation jig is of the structure of the third embodiment, only the first part 1 needs to be removed.

[0072] Preferably, after step S4, the method further comprises the following steps:

[0073] Step S41, injecting sealing material into the side cavity 61 of the first cylinder 7 and curing it into shape.

[0074] like Figure 4 and Figure 7As shown, specifically, if the terminal packaging jig is a structure in which the first part 1 includes a second sealing ring 132 in the first embodiment, the second embodiment, and the third embodiment, then after removing the second part 2 of the terminal packaging jig, a cavity 61 will be left at the upper end of the plastic shell 6 on the side of the first cylinder 7. Sealing material needs to be injected into the cavity 61 and cured to plastic-seal the first cylinder 7. Since the injection amount is small, the side of the first cylinder 7 will not be squeezed, thereby ensuring smooth insertion of the terminal 8.

[0075] like Fig.13 As shown, if the terminal packaging jig is the structure in which the first part 1 does not include the second sealing ring 132 in the third embodiment, no cavity 61 will be left after the first part 1 is removed.

[0076] Step S5 , inserting the terminal 8 into the first cylinder 7 .

[0077] In this embodiment, the first part 1 is used to close the upper opening of the first cylinder 7, and the second part 2 is sleeved on the outside of the first cylinder 7 and the lower end is lower than the position after the lower end of the terminal 8 is inserted into the first cylinder 7, so as to reduce the volume of the plastic shell 6 that is in direct contact with the side of the first cylinder 7 where the terminal 8 is inserted. After the plastic sealing, the first part 1 is directly removed to open the opening of the first cylinder 7, and the terminal 8 is inserted into the first cylinder 7 to complete the plastic sealing of the power module. The operation is convenient, the steps are simple, the power module production efficiency is high, and the yield rate is high.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A terminal packaging jig, characterized in that: Used for a power module, the power module comprising a substrate (4), a plastic package (6), an electronic component (5) welded on the substrate (4), and a first cylinder (7), the upper end of the plastic package (6) is not lower than the upper end of the first cylinder (7), and a terminal (8) can be inserted into the first cylinder (7); the terminal packaging jig comprises: A first part (1) is arranged at the upper end of the first cylinder (7) and closes the upper end opening of the first cylinder (7); The second part (2) is arranged at the lower end of the first part (1), has a hollow structure, is sleeved on the outside of the first cylinder (7), and has a lower end lower than the position of the lower end of the terminal (8) after being inserted into the first cylinder (7), so as to reduce the volume of the plastic shell (6) that is in direct contact with the side of the first cylinder (7) where the terminal (8) is inserted; The plastic package shell (6) at least plastic packages the substrate (4), the electronic components (5) and the second part (2); release material is provided at the contact portions between the first part (1) and the second part (2) and the plastic package shell (6).

2. The terminal packaging jig according to claim 1, characterized in that: The first part (1) comprises a plate body (11), the plate body (11) covers the upper end of the first cylinder (7), the plate body (11) is located at the upper end of the plastic shell (6), and a release film is arranged on the lower surface; the second part (2) comprises a second cylinder (21), the second cylinder (21) is connected to the lower end of the plate body (11), is sleeved on the outer side of the first cylinder (7), a release film is arranged on the lower surface and the side surface, and the lower end of the second cylinder (21) does not contact the surface of the substrate (4); the plate body (11) and the second cylinder (21) are integrally formed and are made of steel; Wherein, the plastic-sealed shell (6) plastic-seales the second cylinder (21) and the lower end of the side surface of the first cylinder (7).

3. The terminal packaging jig according to claim 1, characterized in that: The first part (1) comprises a first sealing plug (12); the second part (2) comprises a first sealing ring (22), the first sealing ring (22) being connected to the outer side of the lower end of the first sealing plug (12) and sleeved on the outer side of the first cylinder (7); the first sealing plug (12) and the first sealing ring (22) are integrally formed and made of a soft, high-temperature resistant release material; The plastic package shell (6) plastic packages the first sealing plug (12), the first sealing ring (22) and the portion of the first cylinder (7) that is not inserted into the terminal (8).

4. The terminal packaging jig according to claim 1, characterized in that: The first part (1) comprises a second sealing plug (13), the lower end of which is clamped with the first cylinder (7) and is made of a soft, high-temperature-resistant release material; the second part (2) comprises a third cylinder (23), which is arranged at the lower end of the second sealing plug (13), sleeved on the outside of the first cylinder (7), and is made of the same material or steel as the first cylinder, and the lower end of which is fixedly connected to the base plate (4); The outer diameter of the second sealing plug (13) is not less than the outer diameter of the third cylinder (23), and the plastic packaging shell (6) plastic-packages the second sealing plug (13) and the third cylinder (23).

5. The terminal packaging jig according to claim 4, characterized in that: The lower end of the second sealing plug (13) is provided with a sealing block (132), and the sealing block (132) is inserted into the first cylinder (7).

6. The terminal packaging jig according to claim 5, characterized in that: The first part (1) comprises a second sealing ring (131) arranged on the outer side of the lower end of the second sealing plug (13); the second sealing ring (131) is sleeved on the outer side of the third cylinder (23); the second sealing plug (13) and the second sealing ring (131) are integrally formed.

7. The terminal packaging jig according to claim 4, characterized in that: The third cylinder (23) has a second outer edge (231) at the outer upper end, or has a second outer edge (231) at the outer lower end, or has a second outer edge (231) at the outer upper end and the outer lower end.

8. The terminal packaging jig according to any one of claims 1 to 7, characterized in that: The first cylinder (7) has a first outer edge (71) at the upper and lower ends of the outer side.

9. A method for packaging a power module, characterized in that: The following steps are involved: The second part (2) is sleeved on the outside of the first cylinder (7) so that the lower end of the second part (2) is lower than the position after the lower end of the terminal (8) is inserted into the first cylinder (7); the first part (1) is arranged on the upper end of the first cylinder (7) to close the upper end opening of the first cylinder (7), thereby completing the assembly of the terminal packaging jig and the pre-packaged body; Invert the terminal packaging jig and the pre-packaged body and place them into the plastic packaging mold; Close the mold, inject sealing material, and plastic seal the mold; Taking out the plastic-sealed power module, at least removing the first part (1) of the terminal packaging jig to open the first cylinder (7); The terminal (8) is inserted into the first cylinder (7).

10. The method for packaging a power module according to claim 9, characterized in that: After the step of removing the plastic-sealed power module and at least removing the first part (1) of the jig to open the first cylinder (7), the method further comprises the following steps: A sealing material is injected into the side cavity (61) of the first cylinder (7) and solidified to form the sealing material.

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