Novel split type crimping Pin structure

Abstract

A novel split type crimping Pin structure disclosed by the present invention comprises a Pin which comprises a Pin guide part, a Pin crimping part, a limiting boss and a Pin tail part, the Pin crimping part is used for being in interference fit with a PCB, the upper end of the Pin crimping part is electrically connected with the Pin guide part, the lower end of the Pin crimping part is electrically connected with the limiting boss, and the Pin crimping part is used for being in interference fit with the PCB. The tail part of the Pin is electrically connected with the limiting boss; the tail parts of the Pins are inserted into the base and are limited through the limiting bosses, so that the tail parts of the Pins are prevented from penetrating through the base to be in contact with the DBC board; the length of the tail part of the Pin is set to be L, the height of the base is set to be h, and L is smaller than h; the upper end face and the lower end face of the base are each provided with a material containing structure, the material containing structures are used for containing more welding flux so that the welding firmness of the base and the DBC board can be improved, and the material containing structures are further used for limiting the limiting bosses.

Description

Technical Field

[0001] The invention relates to the technical field of power modules, and in particular to a novel split-type crimping pin structure. Background Art

[0002] At present, the common split-type crimping Pin structure on the market generally includes two parts: Pin and base. The crimping Pin structure is mainly used in power modules to connect PCB and DBC to transmit drive signals or conduct electricity. However, in the process of assembling PCB on power module, the existing split-type crimping Pin structure will face some problems. For example, when the PCB is passed through the Pin and the Pin crimping part is connected by interference, the Pin has completely passed through the base and directly contacted with the DBC (copper-clad ceramic substrate) before the Pin crimping part is squeezed and deformed by the PCB, thereby damaging the DBC. In addition, the existing base structure also needs to distinguish between the front and back sides, which results in the need to pay attention to the front and back sides of the base when assembling the Pin and the base, resulting in complex assembly process and low efficiency. Summary of the invention

[0003] The purpose of the present invention is to design a novel split-type crimping Pin needle structure to solve the problem that the DBC board at the bottom is easily damaged during the assembly process of the PCB board in the existing split-type crimping Pin needle structure, and the problem that the existing split-type crimping Pin needle structure has a complex assembly process and low assembly efficiency.

[0004] To achieve the above object, the present invention is implemented by the following technical solutions:

[0005] The present invention designs a novel split type crimping pin structure, which comprises:

[0006] A pin, comprising a pin guide, a pin crimping portion, a limiting boss and a pin tail, which are sequentially arranged from top to bottom, wherein the pin crimping portion is used for interference fit with a PCB board, the upper end of the pin crimping portion is electrically connected to the pin guide, the lower end of the pin crimping portion is electrically connected to the limiting boss, and the pin tail is electrically connected to the limiting boss;

[0007] and a base, wherein the tail of the Pin needle is inserted into the base and is limited by the limiting boss to prevent the tail of the Pin needle from passing through the base and contacting the DBC board;

[0008] Wherein, the length of the tail of the Pin needle is set to L, the height of the base is set to h, and L<h; wherein, a material holding structure is respectively provided on the upper end surface and the lower end surface of the base, and the material holding structure is used to accommodate more solder to increase the welding firmness between the base and the DBC board, and the material holding structure is also used to limit the limiting boss.

[0009] Furthermore, a novel split crimping Pin structure is provided: a first guiding slope is arranged on one end of the Pin guide portion away from the Pin crimping portion; the first guiding slope is used to guide the PCB board to pass through the Pin guide portion and perform interference fit with the Pin crimping portion.

[0010] Preferably, by providing a first guiding slope at the end of the Pin needle guide portion, the Pin needle guide portion is formed into a pointed structure, which is conducive to passing the PCB board through the Pin needle guide portion and forming an interference fit with the Pin needle crimping portion during the PCB board assembly process.

[0011] Furthermore, a novel split crimping Pin structure is provided: a second guiding bevel is arranged on one end of the Pin tail away from the limiting boss; the second guiding bevel is used to guide the Pin tail to be inserted into the base.

[0012] Preferably, by providing a second guiding slope at the end of the tail of the Pin pin, the tail of the Pin pin also forms a pointed structure, which is conducive to smoothly inserting the Pin pin into the base during the assembly process of the Pin pin and the base, thereby simplifying the assembly process of the Pin pin and the base.

[0013] Furthermore, a novel split-type crimping pin structure is provided: the base is configured as a hollow tubular structure.

[0014] Furthermore, a novel split type crimping pin structure is provided: the material storage structures respectively arranged on the upper end surface and the lower end surface of the base are the same.

[0015] Preferably, the upper end surface and the lower end surface of the base are set to the same structure, so that there is no need to distinguish between the front and back sides of the base during the assembly process of the Pin pin and the base, thereby reducing the operational complexity of the assembly process of the Pin pin and the base and improving the assembly efficiency.

[0016] Furthermore, a new type of split crimping pin structure: the material holding structure is configured to be composed of a plurality of protrusions; the plurality of protrusions are protrudingly arranged on the upper end surface and the lower end surface, and a slot is formed between the plurality of protrusions, and the limiting boss is clamped in the slot.

[0017] Furthermore, a new type of split crimping pin structure: the material containing structure is arranged to be composed of a plurality of grooves; a plurality of grooves are recessed and arranged on the upper end surface and the lower end surface, and the limiting boss is clamped in the groove.

[0018] Furthermore, a novel split type crimping pin structure is provided: the pin guide portion, the pin crimping portion, the limiting boss and the pin tail are integrated.

[0019] Beneficial effects of the present invention:

[0020] (1) The novel split crimping Pin structure designed by the present invention is provided with a limiting boss. When the Pin (the tail of the Pin) is inserted into the base and reaches a certain stroke, the limiting boss interferes with the end face of the base, thereby preventing the Pin from continuing to move downward to avoid the problem of the tail of the Pin colliding with the DBC board, thereby avoiding damage to the DBC board. In addition, the present invention ensures that the heights of all Pins in the power module are consistent through the provision of the limiting boss, thereby stabilizing the performance of the module.

[0021] (2) With the novel split-type crimping Pin structure designed by the present invention, when the Pin crimping portion is subjected to the compression and deformation of the PCB board during the insertion assembly, the setting of the limiting boss prevents the tail of the Pin from passing through the base and contacting the DBC board, thereby avoiding the collision between the tail of the Pin and the DBC board, and preventing damage to the DBC board. Furthermore, the compression pressure of the PCB board can be directly dispersed to the DBC board.

[0022] (3) The novel split-type crimping pin structure designed by the present invention has the same material storage structure respectively arranged on the upper end face and the lower section of the base. On the one hand, it can make the base accommodate more solder, so that the welding between the base and the DBC board is more solid, and the stability of the product is improved; on the other hand, the setting of the material storage structure allows the limiting boss and the material storage structure to form a snap connection, so as to avoid the problem of unstable position of the pin after the pin is assembled with the base, thereby improving the structural stability of the novel split-type crimping pin structure itself. In addition, the present invention has a simple structure and low manufacturing difficulty.

[0023] (4) The novel split-type crimping Pin structure designed by the present invention has a first guiding bevel on the Pin guide part, so that the Pin guide part can form a pointed structure, which is conducive to passing the PCB board through the Pin guide part and forming an interference fit with the Pin crimping part during the PCB board assembly process, simplifying the PCB board assembly process during the power module manufacturing process. The present invention also has a second guiding bevel on the Pin tail, so that the Pin tail also forms a pointed structure, which is conducive to smoothly inserting the Pin into the base during the Pin and base assembly process, simplifying the Pin and base assembly process, that is, simplifying the manufacturing process of the novel split-type crimping Pin structure itself.

[0024] (5) The novel split-type crimping Pin structure designed by the present invention sets the upper end surface and the lower end surface of the base to the same structure, so that during the assembly process of the Pin pin and the base, there is no need to distinguish between the front and back sides of the base, thereby reducing the operational complexity of the assembly process of the Pin pin and the base and improving the assembly efficiency, that is, improving the production efficiency of the novel split-type crimping Pin structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A cross-sectional schematic diagram of a novel split-type crimping pin structure designed for Example 1 of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the Pin needle in Example 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the base in Example 1 of the present invention;

[0029] Figure 4 It is a schematic diagram of the interference fit between the novel split type crimping Pin structure and the PCB board and the welding with the DBC board according to the first embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the base in Example 2 of the present invention.

[0031] Markings in the figure: 1-Pin needle, 2-base, 3-PCB board, 4-DBC board, 11-Pin needle guide part, 12-Pin needle crimping part, 13-limiting boss, 14-Pin needle tail, 21-upper end surface, 22-lower end surface, 23-bump, 24-card slot, 25-groove, 111-first guide slope, 141-second guide slope. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the position or positional relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0034] Example 1

[0035] like Figures 1 to 4 As shown, this embodiment 1 designs a novel split type crimping pin structure, and the split type crimping pin structure includes:

[0036] The pin 1 comprises a pin guide portion 11, a pin crimping portion 12, a limiting boss 13 and a pin tail portion 14 which are integrated from top to bottom; the upper end of the pin crimping portion 12 is electrically connected to the pin guide portion 11, the lower end of the pin crimping portion 12 is electrically connected to the limiting boss 13, a first guide slope 111 is provided at one end of the pin guide portion 11 away from the pin crimping portion 12, the PCB board 3 is guided to pass through the pin guide portion 11 by the first guide slope 111, so as to achieve an interference fit between the PCB board 3 and the pin crimping portion 12, the pin tail portion 14 is electrically connected to the limiting boss 13, and a second guide slope 141 is provided at one end of the pin tail portion 14 away from the limiting boss 13;

[0037] and a base 2, which is set as a hollow tubular structure, the pin tail 14 is inserted into the base 2 (in this insertion process, the second guide slope 141 can be used to guide the pin tail 14 so that it can be inserted into the base 2 more smoothly), and after the pin tail 14 is inserted into the base 2, it is limited by the limiting boss 13 to prevent the pin tail 14 from passing through the base 2 and contacting the DBC board 4, the length of the pin tail 14 is set to L, and the height of the base 2 of the hollow tubular structure is set to h, and L<h is satisfied;

[0038] Among them, the same material containing structure is respectively arranged on the upper end face 21 and the lower end face 22 of the base 2, and the material containing structure is composed of a plurality of symmetrically arranged protrusions 23 (specifically, the material containing structure in the present embodiment 1 is composed of 4 protrusions 23), each protrusion 23 is protrudingly arranged on the upper end face 21 and the lower end face 22, and the protrusions 23 are non-contactly arranged, so that a card groove 24 can be formed between the protrusions 23, and the card groove 24 just allows the limiting boss 13 to be clamped therein, which can constitute a limiting effect on the limiting boss 13, thereby avoiding the problem of unstable structure of the Pin needle 1 after the Pin needle tail 14 (i.e., the Pin needle 1) is inserted into the base 2, thereby achieving the purpose of improving the structural stability of the new split-type crimping Pin needle structure itself, and the designed material containing structure can also be used to accommodate more solder, thereby increasing the welding firmness of the base 2 and the DBC board 4.

[0039] like Figure 4As shown, during the process of assembling the PCB board 3, the PCB board 3 needs to be passed through the Pin needle guide part 11 and then achieve an interference fit with the Pin needle crimping part 12. During this assembly process, the PCB board 3 will squeeze the Pin needle crimping part 12, and the existing split-type crimping Pin needle structure will cause the Pin needle tail to directly penetrate the base 2 and hit the DBC board 4 during this squeezing process, which will cause damage to the DBC board 4. However, in the new split-type crimping Pin needle structure designed in Example 1, when the Pin needle crimping part 12 is squeezed by the PCB board 3, the setting of the limiting boss 13 prevents the Pin needle tail 14 from passing through the base 2 and impacting the DBC board 4. Therefore, the Pin needle tail 14 can be prevented from colliding with the DBC board 4, and the DBC board 4 will not be damaged. In addition, the squeezing pressure of the PCB board 3 can be directly dispersed to the DBC board 4, thereby avoiding damage to the power module due to uneven squeezing force during the assembly process.

[0040] like Figure 4 As shown, during the assembly process of the Pin needle 1 (Pin needle tail 14) and the base 2, since a material containing structure is provided on the upper end surface 21 of the base 2, after the Pin needle 1 is inserted into the base 2, the card slot 24 on the material containing structure can be used to form a card connection with the limiting boss 13, thereby fixing the position of the Pin needle 1 in the base 2, thereby achieving the purpose of improving the structural stability of the new split crimping Pin needle structure itself.

[0041] like Figure 4 As shown, during the welding process of the novel split crimping Pin structure of the embodiment 1 and the DBC board 4, due to the provision of a material containing structure, more solder can be contained between the lower end surface 22 of the base 2 and the DBC board 4, thereby making the welding between the base 2 and the DBC board 4 more firm and improving the stability of the manufactured power module product.

[0042] Example 2

[0043] The difference between Example 2 and Example 1 is that: Figure 5 As shown, the material containing structure in Example 2 is composed of a plurality of grooves 25 (specifically, the material containing structure in Example 2 is composed of four grooves 25), and the four grooves 25 are recessed on the upper end surface 21 and the lower end surface 22, and the size of the grooves 25 is designed to be just snap-fitted with the limiting boss 13. After the limiting boss 13 is snap-fitted into the grooves 25, the limiting boss 13 can be limited by the grooves 25, thereby avoiding the problem of unstable structure of the Pin needle 1 after the Pin needle tail 14 (i.e., the Pin needle 1) is inserted into the base 2, thereby improving the structural stability of the new split-type crimping Pin needle structure itself.

[0044] In addition, the new split-type crimping Pin needle structure designed in Examples 1 and 2 of the present invention sets the upper end surface 21 and the lower end surface 22 of the base 2 to the same structure, so that during the assembly process of the Pin needle 1 and the base 2, there is no need to distinguish between the front and back sides of the base 2, thereby reducing the operational complexity of the assembly process of the Pin needle 1 and the base 2 and improving the assembly efficiency, that is, improving the production efficiency of the new split-type crimping Pin needle structure.

[0045] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A new type of split crimping pin structure, characterized in that: The split type crimping pin structure includes: A pin (1) comprises a pin guide portion (11), a pin crimping portion (12), a limiting boss (13) and a pin tail portion (14), wherein the pin crimping portion (12) is used for interference fit with a PCB board (3), the upper end of the pin crimping portion (12) is electrically connected to the pin guide portion (11), the lower end is electrically connected to the limiting boss (13), and the pin tail portion (14) is electrically connected to the limiting boss (13); and a base (2), wherein the pin tail (14) is inserted into the base (2) and is limited by the limiting boss (13) to prevent the pin tail (14) from passing through the base (2) and contacting the DBC board (4); The length of the pin tail (14) is set to L, the height of the base (2) is set to h, and L<h is satisfied; Wherein, a material containing structure is respectively provided on the upper end surface (21) and the lower end surface (22) of the base (2), and the material containing structure is used to contain more solder to increase the welding firmness between the base (2) and the DBC board (4), and the material containing structure is also used to limit the limiting boss (13).

2. According to the novel split type crimping pin structure of claim 1, it is characterized in that: A first guiding inclined surface (111) is provided on one end of the Pin needle guide portion (11) away from the Pin needle crimping portion (12); The first guiding inclined surface (111) is used to guide the PCB board (3) to pass through the Pin guide portion (11) and to perform interference fit with the Pin crimping portion (12).

3. According to the novel split type crimping pin structure of claim 1, it is characterized in that: A second guiding inclined surface (141) is provided on one end of the pin tail (14) away from the limiting boss (13); The second guiding inclined surface (141) is used to guide the pin tail (14) to be inserted into the base (2).

4. According to the novel split type crimping pin structure of claim 1, it is characterized in that: The base (2) is configured as a hollow tubular structure.

5. According to the novel split type crimping pin structure of claim 1, it is characterized in that: The material containing structures respectively arranged on the upper end surface (21) and the lower end surface (22) of the base (2) are identical.

6. A novel split type crimping pin structure according to claim 1 or 5, characterized in that: The material containing structure is configured to be composed of a plurality of protrusions (23); A plurality of protrusions (23) are protrudingly arranged on the upper end surface (21) and the lower end surface (22), and a clamping groove (24) is formed between the plurality of protrusions (23), and the limiting boss (13) is clamped in the clamping groove (24).

7. A novel split type crimping pin structure according to claim 1 or 5, characterized in that: The material containing structure is configured to be composed of a plurality of grooves (25); A plurality of grooves (25) are indented on the upper end surface (21) and the lower end surface (22), and the limiting bosses (13) are snap-fitted into the grooves (25).

8. The novel split type crimping pin structure according to claim 1 is characterized in that: The Pin needle guide portion (11), the Pin needle crimping portion (12), the limiting boss (13) and the Pin needle tail portion (14) are integrally arranged.

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