Connection structure of bus bar and printed circuit board

Abstract

The invention discloses a connecting structure of a bus bar and a printed circuit board, which comprises a fixing nut and a screw, at least one pair of welding holes are formed in two sides of the printed circuit board, a first screw hole vertically opposite to the welding holes is formed in the top of the bus bar, and the fixing nut is composed of a nut main body, a convex edge and a second screw hole formed in the top of the convex edge. The screws penetrate through the first screw holes from top to bottom and are screwed into the second screw holes so that the screws and the fixing nuts can be tightly combined into a whole, and then the bus bar and the printed circuit board can be stably clamped. According to the invention, a welding process and a mechanical connection process are integrated, the disassembly is convenient, the maintenance is easy, a welding nut main body-printed circuit board-bus bar-screw sandwich type structure can be formed, the connection strength and stability of the bus bar and the printed circuit board are improved, and the problem that a welding seam is easy to crack and fall off in a single welding and fixing mode is solved.

Description

Technical Field

[0001] This invention relates to the field of busbar and printed circuit board connection technology, specifically a connection structure between a busbar and a printed circuit board. Background Technology

[0002] With the technological development of printed circuit boards, printed circuit boards often need to carry large currents of hundreds of amperes with external components. Busbars are usually soldered onto printed circuit boards. However, the welds formed by soldering often cannot withstand high-intensity vibrations and crack. Cracking often causes open circuits or poor connections, which in turn leads to product failure. Busbars also risk detaching from printed circuit boards. Therefore, a connection structure between busbars and printed circuit boards is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a connection structure between a busbar and a printed circuit board, so as to solve the problem that the weld seam is prone to cracking and falling off when the existing busbar and printed circuit board are fixed by welding as mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a connection structure between a busbar and a printed circuit board, comprising a fixing nut located below the printed circuit board and a screw located above the busbar. At least one pair of solder holes are provided on both sides of the printed circuit board, and a first screw hole perpendicular to the solder holes is provided on the top of the busbar. The fixing nut consists of a nut body, a raised edge located on the top of the nut body, and a second screw hole located on the top of the raised edge and penetrating the nut body. The center of the second screw hole is on the same vertical line as the center of the first screw hole, and the raised edge is inserted into the solder hole from bottom to top. The nut body is soldered to the bottom of the printed circuit board. The screw passes through the first screw hole from top to bottom and is screwed into the second screw hole, so that the screw and the fixing nut are tightly integrated, thereby firmly clamping the busbar to the printed circuit board.

[0005] Furthermore, the top view of the protruding edge and the top view of the weld hole are both rectangular or circular structures. The protruding edge is integrally connected with the nut body, and the lateral length of the protruding edge does not exceed the outer diameter of the nut body.

[0006] Furthermore, when the protruding edge extends into the weld hole and is welded into the weld hole along the edge of the protruding edge, the vertical height of the protruding edge does not exceed the cavity depth of the weld hole.

[0007] Furthermore, the solder holes are provided in three pairs, and the three pairs of solder holes are arranged at intervals along the length of the printed circuit board, and the width of the solder hole cavity does not exceed the width of the busbar.

[0008] Furthermore, a washer is provided between the outer surface of the screw and the top surface of the busbar, and the diameter of the washer exceeds the diameter of the cavity of the first screw hole.

[0009] The beneficial effects of this invention are: This invention integrates welding technology and mechanical connection technology, making disassembly convenient and maintenance easy. The nut body can be welded to the back of the printed circuit board first, and then the front of the printed circuit board is fixed to the busbar by screws using the cooperation of screws and nut body, thereby clamping the printed circuit board and busbar together, thus forming a sandwich structure of welded nut body-printed circuit board-busbar-screw, which improves the connection strength and stability of the busbar and printed circuit board, and solves the problem of easy cracking and falling off of the weld in the single welding fixing method. Attached Figure Description

[0010] Figure 1 This is an exploded view of the structure of the present invention; Figure 2 This is a three-dimensional view of the structure of the present invention in use; Figure 3 This is a three-dimensional view of the screw and fixing nut of the present invention.

[0011] In the diagram: 1. Printed circuit board; 11. Solder hole; 2. Busbar; 21. Screw hole No. 1; 3. Screw; 31. Washer; 4. Fixing nut; 41. Nut body; 42. Protruding flange; 43. Screw hole No. 2. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1-3This invention provides a technical solution for a connection structure between a busbar and a printed circuit board, including a fixing nut 4 located below the printed circuit board 1 and a screw 3 located above the busbar 2. The printed circuit board 1 has at least one pair of solder holes 11 on both sides, and the busbar 2 has a first screw hole 21 perpendicular to the solder holes 11 on its top. The fixing nut 4 consists of a nut body 41, a flange 42 located on the top of the nut body 41, and a second screw hole 43 located on the top of the flange 42 and penetrating the nut body 41. The center of the second screw hole 43 is aligned with the first screw hole 11. The centers of the holes in the first screw hole 21 are on the same vertical line, and the protruding edge 42 is inserted into the welding hole 11 from bottom to top. The nut body 41 is welded to the bottom of the printed circuit board 1. The screw 3 passes through the first screw hole 21 from top to bottom and is screwed into the second screw hole 43, so that the screw 3 and the fixing nut 4 are tightly combined, thereby firmly clamping the busbar 2 and the printed circuit board 1. A washer 31 is provided between the outer surface of the screw 3 and the top surface of the busbar 2. The diameter of the washer 31 is larger than the diameter of the cavity of the first screw hole 21. The washer 31 is a metal washer, which is made of copper or iron.

[0014] In this embodiment, the top view of the protruding edge 42 and the top view of the welding hole 11 are both rectangular or circular. The protruding edge 42 is integrally connected with the nut body 41, and the lateral length of the protruding edge 42 does not exceed the outer diameter of the nut body 41. When the protruding edge 42 extends into the welding hole 11, it is welded into the welding hole 11 along the edge of the protruding edge 42. The vertical height of the protruding edge 42 does not exceed the cavity depth of the welding hole 11. There are three pairs of welding holes 11, and the three pairs of welding holes 11 are arranged at intervals along the length direction of the printed circuit board 1. The cavity width of the welding hole 11 does not exceed the strip width of the busbar 2. The structure of the welding hole 11 is adapted to the protruding edge 42.

[0015] Before use, the connection structure between the busbar and the printed circuit board (PCB) requires that the cross-sectional area of ​​the busbar 2 and the contact area between the PCB 1 and the busbar 2 be determined based on the current magnitude during the initial design phase of the PCB 1. For different layouts of the PCB 1 in various application scenarios, solder holes 11, the soldering position of the nut body 41, and different shapes of busbar 2 are designed on the PCB 1 according to the actual situation. During use, the protruding edge 42 is first inserted into the solder hole 11, the nut body 41 is soldered to the reverse side of the PCB 1, and then the busbar 2 is fixed to the front side of the PCB 1 with screws 3, thus forming a sandwich structure of soldered nut body 41-printed circuit board 1-busbar 2-screw 3. The screws 3 and the nut body 41 tightly connect the PCB 1 and the PCB 1. The circuit board 1 and the busbar 2 are firmly clamped together. The connection structure between the busbar and the printed circuit board is such that the busbar 2 is in an "L" shape and is set as two sets of busbars 2. The horizontal section of the busbar 2 is fastened to the printed circuit board 1 by screws 3 and fixing nuts 4. Three pairs of solder holes 11 are opened on the printed circuit board 1 at intervals, and the solder holes 11 of each pair are arranged symmetrically from left to right. Each set of busbars 2 is arranged at the solder hole 11 positions on the left and right sides. The nut body 41 of the fixing nut 4 has a third screw hole that is perpendicular to the second screw hole 43. When the screw 3 is screwed into the first screw hole 21 and screwed into the second screw hole 43, due to the setting of the third screw hole, the bottom of the screw body of the screw 3 can extend out from the third screw hole until it extends out of the bottom of the nut body 41.

[0016] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0017] The above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be understood that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. In the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Among these, there are various ways of detachable installation, such as by using a combination of plug-in and snap-fit, or by using bolt connections, etc.

[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection structure between a busbar and a printed circuit board, characterized in that: The device includes a fixing nut located below the printed circuit board and a screw located above the busbar. The printed circuit board has at least one pair of solder holes on both sides, and the busbar has a screw hole at the top that is perpendicular to the solder holes. The fixing nut consists of a nut body, a raised edge at the top of the nut body, and a screw hole at the top of the raised edge that passes through the nut body. The center of the screw hole is on the same vertical line as the center of the screw hole. The raised edge is inserted into the solder hole from bottom to top. The nut body is soldered to the bottom of the printed circuit board. The screw passes through the screw hole from top to bottom and is screwed into the screw hole, so that the screw and the fixing nut are tightly connected as one unit, thereby firmly clamping the busbar to the printed circuit board.

2. The connection structure between a busbar and a printed circuit board according to claim 1, characterized in that: The top view of the protruding edge and the top view of the weld hole are both rectangular or circular. The protruding edge is integrally connected with the nut body, and the lateral length of the protruding edge does not exceed the outer diameter of the nut body.

3. The connection structure between a busbar and a printed circuit board according to claim 1, characterized in that: When the protruding edge extends into the weld hole and is welded into the weld hole along the edge of the protruding edge, the vertical height of the protruding edge does not exceed the depth of the weld hole cavity.

4. The connection structure between a busbar and a printed circuit board according to claim 1, characterized in that: The solder holes are provided in three pairs, and the three pairs of solder holes are arranged at intervals along the length of the printed circuit board, and the cavity width of the solder holes does not exceed the width of the busbar.

5. The connection structure between a busbar and a printed circuit board according to claim 1, characterized in that: A washer is provided between the outer surface of the screw and the top surface of the busbar, and the diameter of the washer exceeds the diameter of the cavity of the screw hole.

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