Signal pin assembly and power module

Abstract

The invention provides a signal pin assembly and a power module, the signal pin assembly comprises a pin seat and a pin rod, and the hardness of the pin rod is greater than that of the pin seat; a conical hole is formed in the needle seat, and the diameter of the hole opening end of the conical hole is larger than that of the hole bottom end of the conical hole; the needle rod comprises an insertion section which is located at one end of the needle rod. In the process that the insertion section is inserted into the conical hole in the first direction, the inner wall of the conical hole is subjected to plastic deformation due to pushing of the insertion section, so that the contact area in interference fit with the insertion section is increased, and therefore the reliability of connection between the needle base and the needle rod is improved, and the falling risk of the needle rod is reduced. Moreover, the contact area of the interference fit between the insertion section and the conical hole is increased, the through-flow cross section is increased, and the signal pin assembly allows a larger current signal to pass through, so that the signal pin assembly can be used in a use scene of conducting a low-current signal and also can be used in a use scene of conducting a high-current signal, and the use experience of the signal pin assembly is improved. And the application range is wider.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a signal pin component and a power module. Background Art

[0002] With the development of the semiconductor industry, power modules with various functions are increasingly used in electrical equipment. The power module includes a packaging structure that encapsulates an internal circuit. The internal circuit and the peripheral circuit are electrically connected through a signal pin assembly. One end of the signal pin assembly is encapsulated with the internal circuit of the packaging structure, and the other end of the signal pin assembly is located outside the packaging structure and is used to electrically connect to the peripheral circuit. In order to facilitate assembly, the signal pin assembly mostly includes two parts: a needle holder and a needle rod. The cross-section of the needle rod is square, and a cylindrical opening is provided in the needle holder. The needle rod is inserted into the opening and connected together through an interference fit. However, the four sides of the needle rod do not contact the inner wall of the opening. Only the four right angles contact the inner wall of the opening of the needle holder. Therefore, the reliability of the connection between the needle rod and the needle holder is reduced, and the risk of the needle rod falling off is increased. In addition, the contact area between the needle rod and the needle holder is small, resulting in a small flow cross-section, which makes the current signal allowed to pass by the signal pin assembly low, and can only be used in scenarios where low current signals are conducted. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a signal pin assembly, including a needle seat and a needle rod, the hardness of the needle rod is greater than the hardness of the needle seat; a conical opening is provided on the needle seat, and the diameter of the hole end of the conical opening is greater than the diameter of the bottom end of the conical opening; the needle rod includes an insertion section, and the insertion section is located at one end of the needle rod; in the process of inserting the insertion section into the conical opening along the first direction, the inner wall of the conical opening is plastically deformed due to the pushing of the insertion section, thereby increasing the contact area of the interference fit with the insertion section.

[0004] Optionally, at least one groove is provided on the outer circumferential surface of the insertion section. When the insertion section is inserted into the conical opening along the first direction, the inner wall of the conical opening is plastically deformed due to the pushing of the insertion section and moves into the groove.

[0005] Optionally, the groove ring is provided on the outer circumferential surface of the insertion section.

[0006] Optionally, the insertion section includes a cylindrical section, a middle section and a conical section in sequence along the first direction, and the diameter of the cylindrical section is d 柱 , the diameter of the middle section is d 中 The first end of the conical segment is connected to the middle segment, and the diameter of the first end of the conical segment is d 锥1 The second end of the conical section is the end away from the middle section, and its diameter is d 锥2, the diameter d of the cylindrical segment 柱 >The diameter d of the first end of the conical segment 锥1 >The diameter d of the middle section 中 The groove is formed between the outer circumferential surface of the middle section, the end surface of the cylindrical section close to the middle section, and the first end surface of the conical section.

[0007] Optionally, the angles between the outer circumferential surface of the middle section and the end surface of the cylindrical section close to the middle section and the angle between the outer circumferential surface of the middle section and the first end surface of the conical section are both right angles.

[0008] Optionally, the conical opening includes a first hole segment, a second hole segment and a third hole segment in sequence along the first direction, the first hole segment corresponds to the cylindrical segment, the second hole segment corresponds to the middle segment, the third hole segment corresponds to the conical segment, the diameter of the cylindrical segment is larger than the orifice diameter of the conical opening, the first end diameter of the conical segment is larger than the maximum diameter of the third hole segment, and the second end diameter of the conical segment is larger than the minimum diameter of the third hole segment.

[0009] Optionally, the height of the tapered opening is not less than the height of the insertion section.

[0010] Optionally, the cross-section of the insertion section is square.

[0011] Optionally, the width of the insertion section is greater than the diameter of the orifice end of the tapered opening.

[0012] Optionally, the needle rod further includes an elastic buffer section, and the buffer section is located in the middle of the needle rod.

[0013] Optionally, the buffer section is curved, and the buffer section is consistent with the curved shape of the clamping hole inside the needle head for clamping the needle rod.

[0014] Optionally, the buffer segment is manufactured by a cold heading process or a stamping process.

[0015] Optionally, the needle rod further includes an external electrical connection section, which is located at the other end of the needle rod.

[0016] Optionally, the tapered opening passes through the bottom surface of the needle seat.

[0017] Optionally, the bottom surface of the needle seat is further provided with at least one tin overflow groove, and the tin overflow groove is located outside the tapered opening.

[0018] Another embodiment of the present invention further provides a power module, including:

[0019] Encapsulation;

[0020] A substrate is located in the package;

[0021] In the signal pin assembly described in the above embodiment, the needle seat is located in the package body, and the bottom of the needle seat is fixed on the substrate or the substrate raising component; the insertion section of one end of the needle rod is inserted into the conical opening, and the other end of the needle rod extends out of the package body.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] In the signal pin assembly provided by the present invention, the hardness of the needle rod is required to be greater than the hardness of the needle seat. In the process of inserting the insertion section into the conical opening along the first direction, the inner wall of the conical opening undergoes plastic deformation due to the pushing of the insertion section, thereby increasing the contact area of the interference fit with the insertion section. Since the contact area of the interference fit between the insertion section and the conical opening is increased, the reliability of the connection between the needle seat and the needle rod is improved, and the risk of the needle rod falling off is reduced.

[0024] Moreover, since the contact area of the interference fit between the insertion section and the tapered opening is increased, the flow cross-section is increased, so that the signal pin assembly allows a larger current signal to pass through. Therefore, the signal pin assembly can be used not only in scenarios where low current signals are conducted, but also in scenarios where high current signals are conducted, thereby having a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 An exploded view of the signal pin assembly provided in Example 1 of the present invention;

[0027] Figure 2 A schematic structural diagram of a needle rod provided in Example 1 of the present invention;

[0028] Figure 3 A schematic structural diagram of a needle holder provided in Example 1 of the present invention;

[0029] Figure 4 An assembly diagram of the signal pin assembly provided in Example 1 of the present invention;

[0030] Figure 5 for Figure 4 Cross-sectional view at AA in the middle;

[0031] Figure 6 for Figure 5Enlarged view of point A in the middle;

[0032] Figure 7 for Figure 4 Cross-sectional view at the middle BB;

[0033] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0034] Figure 9 An exploded view of the signal pin assembly provided in Example 2 of the present invention;

[0035] Figure 10 An assembly diagram of a signal pin assembly provided in Example 2 of the present invention;

[0036] Figure 11 for Figure 10 Cross-sectional view at CC;

[0037] Figure 12 for Figure 11 Enlarged view of point C in the middle;

[0038] Figure 13 for Figure 10 Cross-sectional view at DD in the middle;

[0039] Figure 14 for Figure 11 Enlarged view of point D in the middle;

[0040] Figure 15 A schematic structural diagram of a needle rod provided in Example 3 of the present invention;

[0041] Figure 16 A schematic structural diagram of another needle bar provided in Example 3 of the present invention;

[0042] Figure 17 A schematic structural diagram of a needle holder provided in Example 3 of the present invention;

[0043] Figure 18 This is a schematic diagram of the structure of the power module provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The terms "on" and "above" and any variations thereof are intended to describe positional relationships and do not represent a relationship of direct contact between the described objects.

[0046] Example 1

[0047] Please refer to Figures 1 to 8 An embodiment of the present invention provides a signal pin assembly 1, comprising a needle seat 12 and a needle rod 11, wherein the hardness of the needle rod 11 is greater than the hardness of the needle seat 12.

[0048] The needle seat 12 is provided with a tapered opening 123 , and the diameter of the opening end of the tapered opening 123 is larger than the diameter of the bottom end of the tapered opening 123 .

[0049] The needle rod 11 includes an insertion section 111, which is located at one end of the needle rod 11; when the insertion section 111 is inserted into the conical opening 123 along the first direction, the inner wall of the conical opening 123 is plastically deformed due to the pushing of the insertion section 111, thereby increasing the contact area of the interference fit with the insertion section 111.

[0050] In this embodiment, the hardness of the needle rod 11 is required to be greater than the hardness of the needle seat 12. In the process of inserting the insertion section 111 into the conical opening 123 along the first direction, the inner wall of the conical opening 123 is plastically deformed due to the pushing of the insertion section 111, thereby increasing the contact area of the interference fit with the insertion section 111. Since the contact area of the interference fit between the insertion section 111 and the conical opening 123 is increased, the reliability of the connection between the needle seat 12 and the needle rod 11 is improved in the first direction, and the risk of the needle rod 11 falling off is reduced.

[0051] Moreover, since the contact area of the interference fit between the insertion section 111 and the tapered opening 123 is increased, the flow cross-section is increased, so that the signal pin assembly 1 allows a larger current signal to pass through. Therefore, the signal pin assembly 1 can be used not only in scenarios where low current signals are conducted, but also in scenarios where high current signals are conducted, thereby having a wider range of applications.

[0052] In this embodiment, there is no specific restriction on the materials used to make the needle seat 12 and the needle rod 11 , as long as the hardness of the needle rod 11 is greater than the hardness of the needle seat 12 .

[0053] As an embodiment, the needle seat 12 is made of copper and is not plated.

[0054] The external structure of the needle hub 12 may be any structure, and the present invention does not impose any specific limitations thereon. As an embodiment, the needle hub 12 includes a base 121 and a sleeve 122 protruding from the base 121. The sleeve 122 is cylindrical, and its outer diameter is smaller than that of the base 121. The lower end of the sleeve 122 is integrally mounted on the base 121, and the tapered opening 123 extends from the upper end of the sleeve 122 toward the base 121. Therefore, in this embodiment, the first direction is defined as the axial direction of the tapered opening 123. That is, the first direction can be collinear with the axis of the tapered opening 123 or can be parallel to the axis of the tapered opening 123.

[0055] As an embodiment, at least one groove is provided on the outer circumferential surface of the insertion section 111. During the insertion of the insertion section 111 into the tapered opening 123 along the first direction, the inner wall of the tapered opening 123 undergoes plastic deformation due to the pushing of the insertion section 111 and moves into the groove to form a protrusion 1221. The formation of the protrusion 1221 is due to the plastic deformation of the inner wall of the tapered opening 123 due to the pushing of the insertion section 111. Since the protrusion 1221 is formed in the groove due to the plastic deformation of the inner wall of the tapered opening 123, the protrusion 1221 cooperates with the groove to achieve a connection and locking, thereby enhancing the secure connection between the needle hub 12 and the needle rod 11 and reducing the risk of the needle rod 11 falling off the needle hub 12.

[0056] The present embodiment does not limit the shape of the groove, and it can be an open annular groove provided on the outer circumference of the insertion section 111, or a closed annular groove 1114 provided around the outer circumference of the insertion section 111. To further enhance the secure connection between the needle hub 12 and the needle rod 11, the groove is preferably a closed annular groove 1114 provided around the outer circumference of the insertion section 111.

[0057] This embodiment does not limit the number of grooves, which can be set according to actual usage requirements.

[0058] The insertion section 111 may be a conical structure adapted to the conical opening 123 , or may be other structures, such as a cylindrical structure, a square structure, etc., which is not limited in the present invention.

[0059] This embodiment does not impose any specific restrictions on the sizes of the insertion section 111 and the tapered opening 123, which can be set according to actual usage requirements.

[0060] As an embodiment, the insertion section 111 includes a cylindrical section 1111, a middle section 1112 and a conical section 1113 in sequence along the first direction. The diameter of the cylindrical section 1111 is d 柱 The diameter of the middle section 1112 is d 中 The first end of the conical section 1113 is connected to the middle section 1112, and the diameter of the first end of the conical section 1113 is d 锥1 The second end of the conical section 1113 is the end away from the middle section 1112, and its diameter is d 锥2 , the diameter d of the cylindrical segment 1111 柱 >The diameter d of the first end of the conical section 1113 锥1 >The diameter d of the middle section 1112 中 The annular groove 1114 is formed between the outer circumferential surface of the middle section 1112 , the end surface of the cylindrical section 1111 close to the middle section 1112 , and the first end surface of the conical section 1113 .

[0061] The insertion section 111 is located at the end of the needle rod 11 facing the needle seat 12. The needle seat 12 can be below the needle rod 11 or above the needle rod 11, and the specific setting can be made according to actual use. In this embodiment, taking the needle seat 12 below the needle seat 12 as an example, the lower end of the needle rod 11 is the insertion section 111. Therefore, the insertion section 111 includes a cylindrical section 1111, an intermediate section 1112 and a conical section 1113 from top to bottom, the upper end of the conical section 1113 is connected to the intermediate section 1112, the upper end of the intermediate section 1112 is connected to the cylindrical section 1111, and the annular groove 1114 is formed between the outer peripheral surface of the intermediate section 1112 and the lower end surface of the cylindrical section 1111 and the upper end surface of the conical section 1113.

[0062] In order to prevent the protrusion 1221 on the inner wall of the conical opening 123 from falling out of the groove, the angles between the outer peripheral surface of the middle section 1112 and the lower end surface of the cylindrical section 1111 and the upper end surface of the conical section 1113 are all right angles, that is, the angle between the outer peripheral surface of the middle section 1112 and the lower end surface of the cylindrical section 1111 is a right angle, and the angle between the outer peripheral surface of the middle section 1112 and the upper end surface of the conical section 1113 is also a right angle.

[0063] Since the diameter of the insertion section 111 of the needle rod 11 is variable in multiple stages, the conical opening 123 is also variable in multiple stages to match the insertion section 111 .

[0064] As an embodiment, the conical opening 123 includes a first hole section 1231, a second hole section 1232 and a third hole section 1233 from top to bottom. The first hole section 1231 corresponds to the cylindrical section 1111, the second hole section 1232 corresponds to the middle section 1112, and the third hole section 1233 corresponds to the conical section 1113. When the insertion section 111 is fully inserted into the conical opening 123, the cylindrical section 1111 is located in the first hole section 1231, the middle section 1112 is located in the second hole section 1232, and the conical section 1113 is located in the third hole section 1233. The diameter of the cylindrical section 1111 is larger than the orifice diameter of the conical opening 123, the first end diameter of the conical section 1113 is larger than the maximum diameter of the third hole section 1233, and the second end diameter of the conical section 1113 is larger than the minimum diameter of the third hole section 1233, so as to ensure that the insertion section 111 can undergo plastic deformation when inserted into the conical opening 123.

[0065] In order to ensure that the insertion section 111 can be completely inserted into the tapered opening 123 , the height of the tapered opening 123 must not be less than the height of the insertion section 111 .

[0066] from Figures 5 to 8 It can be seen from the figure that when the insertion section 111 is fully inserted into the tapered opening 123 , the interference between the cylindrical section 1111 and the first hole section 1231 is greater than the interference between the tapered section and the third hole section 1233 .

[0067] Example 2

[0068] Please refer to Figures 9 to 14 In this embodiment, the cross-section of the insertion section 111 in embodiment 1 is replaced with a square.

[0069] As an embodiment, the width of the insertion section 111' is greater than the diameter of the orifice end of the tapered opening 123. The purpose is that when the insertion section 111' is inserted into the tapered opening 123 along the first direction, the inner wall of the tapered opening 123 undergoes plastic deformation due to the pushing of the insertion section 111, thereby increasing the contact area of the interference fit with the insertion section 111'. Since the contact area of the interference fit between the insertion section 111' and the tapered opening 123 is increased, the reliability of the connection between the needle seat 12 and the needle rod 11 is improved in the first direction, and the risk of the needle rod 11 falling off is reduced.

[0070] Since the insertion section 111' of the square cross section has a constant width from top to bottom, and the inner diameter of the tapered opening 123 of the needle seat 12 gradually decreases from top to bottom, when the insertion section 111 is fully inserted into the tapered opening 123, the interference between the upper end of the insertion section 111' and the upper end of the tapered opening 123 is smaller than the interference between the lower end of the insertion section 111' and the lower end of the tapered opening 123. Please refer to Figures 12 to 14 .

[0071] Example 3

[0072] Please refer to Figure 15 and Figure 16 In this embodiment, based on embodiments 1 and 2, a buffer section 112 is added to the needle rod 11.

[0073] Specifically, the needle rod 11 further includes an elastic buffer section 112 , and the buffer section 112 is located in the middle of the needle rod 11 .

[0074] In the package structure, the other end of the pin 11 is located outside the package structure and is used to electrically connect to a peripheral circuit such as an electronic control board. The power module's operating environment is subject to mechanical vibration, thermal stress, and deformation. Therefore, the buffer section 112 can buffer vibrations between the power module and the electronic control board.

[0075] The embodiment does not limit the specific structure of the buffer section 112. As an embodiment, the buffer section 112 is a curve, such as an S-shape. Of course, the embodiment is not limited to the S-shape, and can also be other elastic curve shapes. The buffer section 112 can include an S-shaped structure, such as Figure 15 As shown; it can also include two S-shaped structure combinations, such as Figure 16 As shown, it can also be a combination of multiple S-shaped structures, which is not limited in this embodiment.

[0076] The curved buffer section 112 is consistent with the curved shape of the clamping hole inside the needle head for clamping the needle rod 11.

[0077] When the needle rod 11 is inserted into the needle seat 12, a needle head is needed to clamp the needle rod 11 and insert the needle rod 11 into the needle seat 12. Specifically, a clamping hole that matches the shape of the buffer segment 112 is provided in the needle head. When the clamping hole is consistent with the shape of the buffer segment 112, the orientation of all buffer segments 112 can be controlled to be consistent.

[0078] This embodiment does not impose any specific limitation on the processing and forming process of the buffer segment 112 . For example, the buffer segment 112 may be manufactured by a cold heading process or a stamping process.

[0079] The needle rod 11 further includes an external electrical connection section 113, which is located at the other end of the needle rod 11. That is, the needle rod 11 includes, from top to bottom, the external electrical connection section 113, the buffer section 112, and the insertion section 111, with the buffer section 112 located between the insertion section 111 and the external electrical connection section 113 of the needle rod 11.

[0080] Please refer to Figure 17The tapered opening 123 passes through the bottom surface of the needle holder 12, that is, the tapered opening 123 passes through the entire needle holder 12. In the packaging structure, when the needle holder 12 is soldered to the substrate, the solder paste in liquid state will climb upward along the inner wall of the through-hole through the internal through-hole of the needle holder 12. The vertical climbing height and area of the solder are closely related to the soldering strength of the component. The through-hole can effectively improve the soldering strength and enhance reliability.

[0081] Furthermore, the bottom surface of the needle seat 12 is also provided with at least one tin overflow groove 1211, and the tin overflow groove 1211 is located on the outside of the tapered opening 123, the purpose of which is to increase the soldering contact area, increase the welding strength, and improve the reliability, so that the soldering tin can be hidden as much as possible at the bottom of the needle seat 12 instead of creeping around. The bonding strength and reliability of tin with epoxy molding compound and potting glue are low.

[0082] Example 4

[0083] Please refer to Figure 18 This embodiment provides a power module, comprising a package 2, a substrate 3, and the signal pin assembly 1 described in any of the above embodiments. The substrate 3 is located within the package 2, and the pin header 12 is located within the package 2. The bottom of the pin header 12 is fixed to the substrate 3, such as a ceramic substrate 3 or a substrate-elevating member. The insertion section 111 at one end of the pin rod 11 is inserted into the tapered opening 123, and the other end of the pin rod 11 (i.e., the external electrical connection section 113) extends outside the package 2.

[0084] This embodiment does not limit the method for fixing the needle seat 12 to the substrate 3. For example, ultrasonic welding, solder brazing, laser welding, and other suitable processes may be used.

[0085] This embodiment does not limit the packaging form of the power module. For example, it can be a plastic-encapsulated power module, a shell-encapsulated power module, or other suitable packaging forms.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal pin assembly, characterized in that: It includes a needle seat and a needle rod, the hardness of the needle rod is greater than that of the needle seat; a conical opening is provided on the needle seat, the diameter of the orifice end of the conical opening is greater than the diameter of the bottom end of the conical opening; the needle rod includes an insertion section, and the insertion section is located at one end of the needle rod; in the process of inserting the insertion section into the conical opening along the first direction, the inner wall of the conical opening is plastically deformed due to the pushing of the insertion section, thereby increasing the contact area of the interference fit with the insertion section.

2. The signal pin assembly according to claim 1, wherein: At least one groove is provided on the outer circumference of the insertion section. When the insertion section is inserted into the tapered opening along the first direction, the inner wall of the tapered opening is plastically deformed by the pushing of the insertion section and moves into the groove.

3. The signal pin assembly according to claim 2, wherein: The groove ring is arranged on the outer circumferential surface of the insertion section.

4. The signal pin assembly according to claim 3, wherein: The insertion section includes a cylindrical section, a middle section and a conical section in sequence along the first direction. The diameter of the cylindrical section is d 柱 , the diameter of the middle section is d 中 The first end of the conical segment is connected to the middle segment, and the diameter of the first end of the conical segment is d 锥1 The second end of the conical section is the end away from the middle section, and its diameter is d 锥2 , the diameter d of the cylindrical segment 柱 >The diameter d of the first end of the conical segment 锥1 >The diameter d of the middle section 中 The groove is formed between the outer circumferential surface of the middle section, the end surface of the cylindrical section close to the middle section, and the first end surface of the conical section.

5. The signal pin assembly according to claim 4, wherein: The angles between the outer circumferential surface of the middle section and the end surface of the cylindrical section close to the middle section and the angle between the outer circumferential surface of the middle section and the first end surface of the conical section are both right angles.

6. The signal pin assembly according to claim 4, wherein: The conical opening includes a first hole segment, a second hole segment and a third hole segment in sequence along the first direction, the first hole segment corresponds to the cylindrical segment, the second hole segment corresponds to the middle segment, and the third hole segment corresponds to the conical segment. The diameter of the cylindrical segment is larger than the orifice diameter of the conical opening, the first end diameter of the conical segment is larger than the maximum diameter of the third hole segment, and the second end diameter of the conical segment is larger than the minimum diameter of the third hole segment.

7. The signal pin assembly according to claim 1, wherein: The height of the tapered opening is not less than the height of the insertion section.

8. The signal pin assembly according to claim 1, wherein: The cross section of the insertion section is square.

9. The signal pin assembly according to claim 8, wherein: The width of the insertion section is greater than the diameter of the orifice end of the tapered opening.

10. The signal pin assembly according to claim 1, wherein: The needle rod further comprises an elastic buffer section, which is located in the middle of the needle rod.

11. The signal pin assembly according to claim 10, wherein: The buffer section is curved, and the shape of the buffer section is consistent with the curved shape of the clamping hole inside the needle head for clamping the needle rod.

12. The signal pin assembly according to claim 11, wherein: The buffer section is manufactured by a cold heading process or a stamping process.

13. The signal pin assembly according to claim 1, wherein: The needle rod further includes an external electrical connection section, which is located at the other end of the needle rod.

14. The signal pin assembly according to claim 1, wherein: The tapered opening passes through the bottom surface of the needle seat.

15. The signal pin assembly according to claim 14, wherein: The bottom surface of the needle seat is further provided with at least one tin overflow groove, and the tin overflow groove is located outside the tapered opening.

16. A power module, characterized in that: include: Encapsulation; A substrate is located in the package; According to the signal pin assembly according to any one of claims 1 to 15, the needle seat is located in the package body, and the bottom of the needle seat is fixed on the substrate or the substrate raising component; the insertion section of one end of the needle rod is inserted into the conical opening, and the other end of the needle rod extends out of the package body.

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