Connecting terminal between PCBs and connecting structure between PCBs

Abstract

The utility model relates to a connecting technology between PCBs, and provides a connecting terminal between PCBs and a connecting structure between PCBs, and the connecting terminal between PCBs comprises a welding part which is arranged at the upper end of the terminal and is used for being welded with an upper-layer PCB; the crimping part is arranged at the lower end of the terminal and is used for being crimped with a lower-layer PCB (Printed Circuit Board); one or more downward end parts are arranged on the crimping part; the lower layer PCB is provided with crimping holes corresponding to the positions of the end parts, and the crimping holes are in interference crimping cooperation with the end parts. The utility model relates to a connecting structure between PCBs (Printed Circuit Board), which comprises an upper-layer PCB, a lower-layer PCB and a connecting terminal between the PCBs, the welding part of the inter-PCB connecting terminal is welded with the upper-layer PCB; and the crimping part of the inter-PCB connecting terminal is crimped with the lower-layer PCB. According to the utility model, the problem that the distance between plates is limited in a two-end welding mode can be solved, and compared with a terminal plug-in connection mode, the cost is reduced, and the reliability of power transmission is improved.

Description

Technical Field

[0001] The utility model relates to a PCB board connection technology, in particular to a PCB board connection terminal. Background Art

[0002] As PCB circuit design becomes increasingly complex, the design structure of PCB boards gradually changes from single-layer to multi-layer. At this time, it is necessary to interconnect PCB boards. At present, the main methods for power connection of PCB boards are welding at both ends or terminal plug-in. Figure 1 As shown, in the two-end welding scheme, the power connection between the terminal and the lower PCB adopts the patch reflow process, and the power connection between the terminal and the upper PCB adopts the plug-in wave soldering process. Since the height of the terminal is limited by the patch reflow process, it is impossible to weld a higher terminal, which in turn limits the spacing between PCB boards. Therefore, this scheme is only applicable to the connection between PCB boards with smaller spacing. Chinese utility model patent document CN219042087U discloses a connection structure and an integrated product, the connection structure includes a first capacitor arranged in a vehicle charger, a second capacitor arranged in a voltage converter, a housing with a capacitor installation cavity, a first PCB board connected to the first capacitor and the second capacitor, a second PCB board connected to the first PCB board, the first capacitor and the second capacitor are installed in the capacitor installation cavity, the second PCB board is fixed on the housing, and the second PCB and the first PCB board are arranged at a relative interval. A connecting copper column 41 is provided on the first PCB board 4, and a second PCB board 5 is arranged above the first PCB board 4 and there is a spacing between the two, and the second PCB board 5 is fixed on the housing 3. In the above-mentioned related art, a two-end welding process is used, which can only be applied to small spacing connections, limiting the spacing between PCB boards.

[0003] The terminal plug-in solution is to weld a pin and a socket on each of the two PCB boards, and then plug the pin and the socket together to achieve power connection. This solution requires two terminals and has a complex terminal structure, so the cost is high; the terminals only rely on the pin tip for contact, the contact area is small, the connection reliability is poor, and it cannot carry high power. Summary of the invention

[0004] The utility model aims to solve the problems in the related art that the two-end welding method will limit the distance between PCB boards, the terminal plug-in method has high cost, small contact area, poor connection reliability, and cannot be applied to high-power connection.

[0005] In view of the above-mentioned limitations, the utility model proposes a PCB board connection terminal and a PCB board connection structure.

[0006] In a first aspect, the utility model provides a PCB board connection terminal, comprising: a welding portion, a crimping portion;

[0007] The welding portion is arranged at the upper end of the terminal and is used for welding with the upper PCB board;

[0008] The crimping portion is arranged at the lower end of the terminal and is used for crimping with the lower PCB board;

[0009] An end facing downward is arranged on the crimping portion, and the end is one or more; a crimping hole corresponding to the position of the end is arranged on the lower PCB board, and the crimping hole is in interference crimping fit with the end.

[0010] Further: the terminal also includes:

[0011] A middle part, wherein the middle part connects the welding part and the crimping part, and a step surface is formed at the connection between the middle part and the welding part, and the step surface limits the upper PCB board.

[0012] Furthermore, when there is one end portion, a step surface is formed at the connection between the middle portion and the crimping portion, and the step surface limits the lower PCB board.

[0013] Furthermore: the end portion is circular, and saw teeth are formed on the outer periphery of the end portion; the crimping hole is circular, and the diameter of the crimping hole is smaller than the diameter of the circumscribed circle of the saw teeth.

[0014] Further: the end portion is in the shape of a triangular prism, a quadrangular prism, or a polygonal prism; the crimping hole is in the shape of a circle, the diameter of which is smaller than the diameter of the circumscribed circle of the end portion;

[0015] The end surface of the end portion is in the shape of a flat head, a hemispherical shape, a cone shape, or a truncated cone shape.

[0016] Furthermore: the welding portion has one or more welding columns; the end surface of the welding column is flat, hemispherical, conical, or truncated cone.

[0017] Furthermore: the welding portion, the middle portion, and the crimping portion are an integrated structure; the terminal is made of copper or copper alloy; and / or the terminal surface is tin-plated.

[0018] In a second aspect, the utility model provides a PCB board connection structure, comprising:

[0019] An upper PCB board, a lower PCB board, and connection terminals between the PCB boards;

[0020] The welding part of the inter-PCB board connecting terminal is welded to the upper PCB board, a welding hole is provided on the upper PCB board, the welding column of the welding part passes through the welding hole, and is welded to the upper PCB board by solder;

[0021] The crimping portion of the inter-PCB board connecting terminal is crimped with the lower PCB board, and a crimping hole corresponding to the end position of the inter-PCB board connecting terminal is provided on the lower PCB board, and the crimping hole is interferingly crimped with the end.

[0022] Compared with the related art, the utility model has the following advantages:

[0023] The PCB board connection terminal of the first aspect of the utility model realizes power connection by setting a crimping portion to be crimped with the lower PCB board. The terminal size can be set as needed to adjust the distance between the boards, which solves the problem that the distance between the boards is limited due to the inability to weld higher terminals. On the other hand, through the crimping of the terminal, the cost is reduced and the reliability of power transmission is improved compared with the terminal plug-in connection method.

[0024] The PCB board connection structure of the second aspect of the utility model can set the terminal size as needed to adjust the distance between the boards by using the above-mentioned PCB board connection terminals, thereby solving the problem that the distance between the boards is limited due to the inability to weld higher terminals. On the other hand, through the crimping of the terminals, the cost is reduced and the reliability of power transmission is improved compared to the terminal plug-in connection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of connecting a PCB board by two-end welding in the related art;

[0026] Figure 2 A schematic diagram of the structure of a PCB board connection terminal provided in one embodiment of the utility model;

[0027] Figure 3 A schematic diagram of a connection structure between PCB boards provided in one embodiment of the utility model;

[0028] Figure 4 A bottom view of the connection between the PCB board connection terminal and the lower PCB board provided by one embodiment of the utility model;

[0029] Figure 5A A three-dimensional diagram of the shape of a PCB board connection terminal provided in another embodiment of the utility model;

[0030] Figure 5B For Figure 5A A bottom view of the lower PCB board with interference crimping fit of the PCB board connection terminals;

[0031] Figure 6 A three-dimensional diagram of the shape of a PCB board connection terminal provided in yet another embodiment of the present utility model. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below. However, it should be understood that the description here is only used to explain the utility model and is not used to limit the scope of the utility model.

[0033] Unless otherwise defined, all technical terms and scientific terms used herein have the same meanings as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The characterization means involved in this article can refer to the relevant descriptions in the prior art and will not be repeated in this article.

[0034] In this article, "upper" and "lower" are used to describe the connection relationship of the present invention according to the positional relationship in the drawings. It can be understood that "upper" and "lower" in this article can be interchanged, and can also be rotated to become "left", "right" or "front", "back" and other directional relationships, and are not used to limit the scope of protection of the present invention.

[0035] In order to further understand the present invention, the present invention will be described in further detail below in conjunction with the best embodiment.

[0036] Example 1

[0037] like Figure 2 As shown, a PCB board connection terminal comprises: a welding portion 1, a crimping portion 3;

[0038] The welding portion 1 is arranged at the upper end of the terminal and is used for welding with the upper PCB board 5;

[0039] The crimping portion 3 is disposed at the lower end of the terminal and is used for crimping with the lower PCB board 7;

[0040] The crimping portion 3 is provided with an end portion 31 facing downward, and the end portion 31 is one or more. The lower PCB board 7 is provided with a crimping hole corresponding to the position of the end portion 31 , and the crimping hole and the end portion 31 are interferingly crimped and fitted.

[0041] The crimping method of the utility model adopts interference crimping, which is a rigid connection with high connection strength and strong current carrying capacity. The interference crimping method is that the end 31 of the crimping part 3 is a quadrangular prism, a polygonal prism, etc. Correspondingly, a circular opening is set at the position corresponding to each end 31 on the lower PCB board 7, and its diameter is slightly smaller than the circumscribed circle of the end 31 of the crimping part 3. The edge of the end 31 interferes with the circular crimping hole of the lower PCB board 7, and the two are crimped by downward pressure to form a firm fit. Different from the fisheye crimping structure, the fisheye crimping structure deforms the fisheye during crimping, which is a flexible connection with a small current carrying capacity.

[0042] When the terminal of the utility model connects the upper and lower PCB boards, it is first crimped with the lower PCB board 7 and then welded with the upper PCB board 5; the advantage of this method is that, compared with the solution of welding with the lower PCB board 7 first, in the solution of welding with the lower PCB board 7 first, since the general plug-in is placed on the other side of the lower PCB board 7, the plug-in wave soldering cannot be used for this side of the lower PCB board 7, and the patch reflow process must be used, which still limits the spacing between the upper and lower PCB boards. The method of first crimping the crimping part 3 with the lower PCB board 7 avoids the above problem. However, the method of first crimping with the lower PCB board 7 requires high crimping connection strength and strong current carrying capacity, and the interference crimping used in the utility model can meet this requirement.

[0043] Further: the terminal also includes:

[0044] The middle part 2 connects the soldering part 1 and the crimping part 3, and a step surface is formed at the connection between the middle part 2 and the soldering part 1. The step surface limits the upper PCB board 5 and also plays a role in supporting the upper PCB board 5.

[0045] It is understood that the middle portion 2 may be omitted. Figure 2 As shown, the top of the crimping portion 3 can also play the role of the above-mentioned step surface. Another function of the middle portion 2 is to adjust the height between the boards by setting the height of the middle portion 2 to match the requirements of different heights between the boards.

[0046] The end portion 31 may be one or more, for example, one, two, three, four, six, eight, etc. The present invention is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable. Figure 5A As shown, the crimping portion 3 is provided with an end portion 31; Figure 6 As shown, the crimping portion 3 is provided with four end portions 31; Figure 2-4 The crimping portion 3 is provided with nine end portions 31 .

[0047] Further, when there is one end portion 31, a step surface is formed at the connection between the middle portion 2 and the crimping portion 3, and the step surface limits the lower PCB board 7 and also supports the lower PCB board 7. It can be understood that in the scheme where the middle portion 2 is omitted, the step surface can also be formed between the upper portion of the crimping portion 3 and the end portion 31, such as Figure 6 shown.

[0048] Further: the end 31 is circular, and saw teeth are formed on the outer periphery of the end 31. The crimping hole is circular, and the diameter of the crimping hole is smaller than the diameter of the circumscribed circle of the saw teeth. The sharp angle interference amount between the crimping hole and the saw teeth is 0.05-0.2mm; for example, 0.05mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, etc. The utility model is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable. The sharp angle interference amount refers to the difference between the circumscribed circle radius of the sharp angle (the sharp angle of the saw teeth) and the radius of the crimping hole. Figure 5 is a schematic diagram of the sawtooth shape formed on the outer periphery of the end 31. The tip of the saw teeth interferes with the opening on the lower PCB board 7, and the two are pressed together by pressure to achieve power connection. The upper part is also connected to the upper PCB board 5 by welding to achieve power connection between the two PCBs.

[0049] Further: the end 31 is in the shape of a triangular prism, a quadrangular prism, or a polygonal prism; the crimping hole is circular, and its diameter is smaller than the diameter of the circumscribed circle of the end 31; the angle interference between the crimping hole and the end 31 is 0.05-0.2mm; for example, 0.05mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, etc. The utility model is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable. The angle interference refers to the difference between the radius of the circumscribed circle of the sharp corner (the edge of the end 31) and the radius of the crimping hole.

[0050] The end surface of the end portion 31 is flat, hemispherical, conical, or truncated-conical.

[0051] When the end surface of the end portion 31 is set to be hemispherical, conical, or truncated cone, the resistance of inserting into the crimping hole during crimping can be reduced, making the crimping action smoother.

[0052] Further: the welding part 1 is provided with one or more welding columns, such as Figure 6 There are 4 welding columns shown, and the number of welding columns can be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc. The utility model is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable; the end face of the welding column is flat, hemispherical, conical, or truncated cone.

[0053] When the end face of the welding column is set to be hemispherical, conical, or truncated cone, the resistance of inserting into the welding hole during welding can be reduced, making welding easier.

[0054] Furthermore: the welding portion 1, the middle portion 2, and the crimping portion 3 are an integrated structure; the terminal is made of copper or copper alloy;

[0055] And / or, the terminal surface is tin-plated.

[0056] Furthermore: the limited inter-board height of the terminal is greater than or equal to 1mm, preferably 1-30mm; for example, 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc. The utility model is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0057] Example 2

[0058] like Figure 3 As shown, a PCB board connection structure includes: an upper PCB board 5, a lower PCB board 7, and the PCB board connection terminal as described in Example 1;

[0059] The welding part 1 of the inter-PCB board connecting terminal is welded to the upper PCB board 5; a welding hole is provided on the upper PCB board 5, and the welding column of the welding part 1 passes through the welding hole and is welded to the upper PCB board 5 through the solder 4;

[0060] The crimping portion 3 of the inter-PCB board connecting terminal is crimped with the lower PCB board 7 , and a crimping hole corresponding to the shape of the end 31 of the inter-PCB board connecting terminal is provided on the lower PCB board 7 , and the crimping hole and the end 31 are interferingly crimped and fitted.

[0061] It can be understood that the position correspondence indicates that when there are multiple ends 31, the number of crimping holes must be the same as the number of ends 31, and the positions must correspond.

[0062] As attached Figure 3 As shown, first, the connecting terminal between the PCB boards is crimped with the lower PCB board 7 using downward pressure, and an interference fit is achieved by using the end 31 of the crimping portion 3 and the interfering portion of the crimping hole of the lower PCB board 7, as shown in FIG. Figure 4 As shown, power transmission is achieved. Then the upper PCB board 5 is connected to the welding column of the welding part 1 of the connecting terminal between the PCB boards by wave soldering, and 4 is the solder at the joint. In this way, the connection between the upper and lower PCBs can be achieved and power can be transmitted. The middle part 2 plays a supporting and limiting role for the upper and lower PCB boards.

[0063] The connection between the multi-layer PCB boards can be realized by connecting the upper PCB board 5 and the lower PCB board 7 respectively through a plurality of inter-PCB board connection terminals 6 .

[0064] In the embodiments of the present invention, the terminals and connection structures of the present invention can be used for connection between PCB boards. It can be understood that the terminals and connection structures are not limited to the above applications, but can also be used for connection between other components suitable for the inventive concept of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PCB board connection terminal, characterized in that: include: Welding part (1), crimping part (3); The welding portion (1) is arranged at the upper end of the terminal and is used for welding with an upper PCB board (5); The crimping portion (3) is arranged at the lower end of the terminal and is used for crimping with a lower PCB board (7); An end portion (31) facing downward is provided on the crimping portion (3), and the end portion (31) is one or more; A crimping hole corresponding to the position of the end portion (31) is provided on the lower PCB board (7), and interference crimping fit is achieved between the crimping hole and the end portion (31).

2. The PCB board connection terminal according to claim 1, characterized in that: The terminal also includes: An intermediate portion (2), the intermediate portion (2) connecting the soldering portion (1) and the crimping portion (3), a step surface being formed at a connection point where the intermediate portion (2) connects the soldering portion (1), the step surface limiting the upper PCB board (5).

3. The PCB board connection terminal according to claim 2, characterized in that: When there is one end portion (31), a step surface is formed at the connection between the middle portion (2) and the crimping portion (3), and the step surface limits the lower PCB board (7).

4. The PCB board connection terminal according to claim 1, characterized in that: The end portion (31) is circular, and saw teeth are formed on the outer circumference of the end portion (31); The crimping hole is circular, and the diameter of the crimping hole is smaller than the diameter of the circumscribed circle of the sawtooth.

5. The PCB board connection terminal according to claim 1, characterized in that: The end portion (31) is in the shape of a polygonal prism; the crimping hole is in the shape of a circle, the diameter of which is smaller than the diameter of the circumscribed circle of the end portion (31); The end surface of the end portion (31) is flat, hemispherical, conical, or truncated-conical.

6. The PCB board connection terminal according to claim 1, characterized in that: The welding part (1) has one or more welding columns; the end surface of the welding column is flat, hemispherical, conical, or truncated cone.

7. The PCB board connection terminal according to claim 2 or 3, characterized in that: The welding portion (1), the middle portion (2), and the crimping portion (3) are an integrated structure; the terminal is made of copper or copper alloy; And / or, the terminal surface is tin-plated.

8. A PCB board connection structure, characterized in that: include: An upper PCB board (5), a lower PCB board (7), and an inter-PCB board connecting terminal according to any one of claims 1 to 7; The welding portion (1) of the inter-PCB board connecting terminal is welded to the upper PCB board (5); a welding hole is provided on the upper PCB board (5), and the welding column of the welding portion (1) passes through the welding hole and is welded to the upper PCB board (5) via solder (4); The crimping portion (3) of the inter-PCB board connecting terminal is crimped to the lower PCB board (7), and a crimping hole corresponding to the position of the end portion (31) of the inter-PCB board connecting terminal is provided on the lower PCB board (7), and the crimping hole and the end portion (31) are interferingly crimped and matched.

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