A circuit board module for implementing a circuit board layer stack based on conductive strips

Abstract

The application relates to a circuit board module for realizing circuit board layering based on a conductive strip, which comprises a first circuit board, a second circuit board and a conductive strip arranged therebetween. The conductive strip is provided with a first through hole with an inner thread and a second through hole without an inner thread. A locking piece is adapted in the first through hole, and the locking piece is provided with a conical stop portion and a locking column with an outer thread. The second circuit board is locked and fixed with the conductive strip through the locking column passing through a through hole of the second circuit board, and forms electrical connection with the first circuit board and the conductive strip, and together forms a basic circuit board module. If upward expansion is needed, a third circuit board can be connected with the second circuit board through a double-through stud. Furthermore, a plurality of the circuit board modules can be stacked through the double-through stud, and unlimited layering expansion is realized. The application integrates the supporting, fixing and conductive bus functions, has compact structure, reliable connection, and greatly improves the flexibility, maintainability and space utilization rate of the circuit board stacking.

Description

Technical Field

[0001] This application relates to the field of circuit boards, and more particularly to a circuit board module based on conductive strips for realizing circuit board stacking. Background Technology

[0002] In the field of circuit board assembly, especially in high-current, multilayer board structures, achieving robust mechanical connections, efficient electrical interconnections, and heat dissipation between circuit boards is a key technological challenge. Existing technologies commonly employ soldered copper pillars or busbars.

[0003] While soldered copper pillars provide support and conductivity, their limited contact area with the circuit board results in a high current carrying capacity (current density) per unit area, making them prone to localized overheating. To achieve current sharing, a large number of copper pillars are often required, increasing the number of components and manufacturing costs, and reducing assembly efficiency due to the high positioning accuracy required for multiple pillars. Furthermore, the height of traditional soldered copper pillars is typically limited (e.g., 8-15mm), making it difficult to meet the demands of modern electronic products for thinner and more compact structures. In terms of fixing, nut-type copper pillars require screws. When the installation height is low, the requirements for the screw material, length, and installation torque are extremely stringent; slight errors can lead to screw breakage or solder joint detachment, resulting in poor reliability.

[0004] On the other hand, although busbars (long strip copper sheets) can provide excellent current sharing and a large conductive area, their structure usually does not have a support function and cannot be used to install and fix other components or circuit boards, thus limiting their application scenarios.

[0005] Therefore, there is an urgent need in this field for a new type of circuit board interconnection structure that integrates support, fixation, merging, and current sharing, while also possessing high reliability, high space utilization, and convenient installation characteristics. Utility Model Content

[0006] The technical problem this application aims to solve is the shortcomings of existing circuit board connection structures, such as limited functionality, low space utilization, poor installation reliability, and difficulty in maintenance. To address these shortcomings, this application provides a multi-functional surface-mount conductive strip and circuit board module that is compact, functionally integrated, easily stackable for expansion, and reliably installed.

[0007] To solve the above-mentioned technical problems, the technical solution adopted in this application is: A circuit board module based on conductive strip circuit board stacking is constructed, including a first circuit board and a second circuit board. The module is characterized by further including a conductive strip connecting the first and second circuit boards. The conductive strip has at least one first through hole with an internal thread and is fitted with a locking member. The locking member includes a tapered stop and a locking post with external threads. The second circuit board has a third through hole corresponding to the position of the first through hole. The locking post passes through the first and third through holes sequentially, locking and fixing the second circuit board to the conductive strip and electrically connecting the first circuit board, the conductive strip, and the second circuit board.

[0008] Preferably, when the locking member is fully screwed into the first through hole, the upper end face of the locking member does not protrude from the upper surface of the conductive strip.

[0009] Preferably, the upper part of the first through hole is frustum-shaped, and its size matches the conical stop of the locking member.

[0010] Preferably, the conductive strip is further provided with at least one set of second through holes, which are light holes used to adapt to insulating components.

[0011] Preferably, the insulating member includes a horizontal arm and a vertical arm, the vertical arm is inserted into the second through hole, the horizontal arm presses against the upper surface of the conductive strip, and the circuit board module is fixed to an external heat sink or mounting bracket by a locking member passing through the insulating member.

[0012] Preferably, it also includes a third circuit board, which is connected to the second circuit board via a double-through stud. The double-through stud has a hollow channel with internal threads inside. The locking pin passes through the third through hole of the second circuit board and extends into one end of the hollow channel, and connects with the internal threads therein.

[0013] Preferably, the first circuit board, the conductive strip, and the second circuit board together constitute a circuit board module, and at least two circuit board modules are stacked and connected by double through studs.

[0014] Preferably, the locking post in the lower circuit board module extends upward into and connects to one end of the hollow channel of the double-through stud, and the upper circuit board module is connected to the other end of the hollow channel through its own locking member.

[0015] Preferably, the upper end face of the locking member is provided with a rotating groove, and the locking member is made of steel.

[0016] Preferably, the conductive strip is a copper strip.

[0017] Compared with the prior art, the circuit board module based on conductive strips provided in this application has the following significant advantages: Functional integration and compact structure: This application integrates support, fixation, busbar and current sharing functions into a conductive strip with a specific hole structure. It replaces the traditional complex structure of "multiple copper pillars + busbar" with a single component, which significantly simplifies the overall design, saves installation space, and conforms to the industry trend of thinner and lighter electronic products with higher integration. The conductive strip is preferably a copper strip, which has excellent conductivity and processability.

[0018] Reliable connection and convenient installation: The conductive strip is connected to the circuit board using surface mount technology (SMT), resulting in a large contact area, high solder strength, and resistance to detachment. The pre-embedded countersunk locking components (screws) not only serve as connectors but also provide positioning during the assembly of the upper circuit board, improving assembly accuracy and efficiency. The locking components are fully recessed into the conductive strip, ensuring the flatness of the mounting surface and increasing production yield.

[0019] Achieving near-infinite stacking expansion: Through an architecture where conductive strips connect adjacent circuit boards to form basic modules, and these modules are stacked using double-through copper pillars, near-infinite vertical stacking of circuit boards is achieved. This modular design greatly enhances layout flexibility, facilitating system expansion and maintenance.

[0020] Low maintenance cost and high reliability: The locking parts are made of steel, which has higher strength. When connected with the double copper pillar (made of copper), because copper is relatively soft, the replaceable double copper pillar will be damaged first under excessive torque, rather than the copper strip soldered to the circuit board or the locking parts themselves. This protects the core and difficult-to-repair circuit board, and greatly reduces maintenance costs and difficulty.

[0021] Heat dissipation and insulation optimization: By setting up insulating components, the entire module can be firmly installed on the heat sink or housing, improving the overall structural stability and heat dissipation efficiency, while also achieving necessary electrical isolation, enhancing the system's safety and adaptability.

[0022] Flexible design and strong adaptability: The thickness of the conductive strip and the specifications of the locking parts can be flexibly selected within a wide range (such as 3-10mm) according to the current size and space constraints, breaking through the height limitation of traditional welded copper pillars and meeting the needs of diverse application scenarios. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the present application will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the axial structure of the conductive strip according to a preferred embodiment of this application; Figure 2 This is a schematic diagram of the cross-sectional structure of the conductive strip according to a preferred embodiment of this application; Figure 3 This is a schematic diagram of the axial structure of the connection between the conductive strip and the locking member in a preferred embodiment of this application; Figure 4 This is a cross-sectional structural diagram of the connection between the conductive strip and the locking member in a preferred embodiment of this application; Figure 5 This is a cross-sectional view of the stacked circuit board module according to a preferred embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this application. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0025] A preferred embodiment of this application provides a circuit board module based on conductive strips for circuit board stacking; such as... Figure 5 As shown, the circuit includes a first circuit board 3 and a second circuit board 4, as well as a copper strip 1 connecting the first and second circuit boards. The copper strip 1 carries the current from the first circuit board 1 back to the second circuit board 2. Because the copper strip has a larger contact area with the circuit board, the soldering is more reliable and less prone to detachment. This is more stable than existing single copper pillar connections and allows for the replacement of multiple copper pillars. Furthermore, if it is necessary to further stack circuit boards on top of the second circuit board 4 and ensure conductivity, a third circuit board 5 can be connected via copper pillars 6. The third and fourth circuit boards can be connected via copper strips, thus achieving multi-layer stacking. In this application, the first and second circuit boards can be connected via copper strips to form a circuit board module. Adjacent circuit board modules can be connected via copper pillars to achieve conductivity, facilitating the stacking of circuit board modules.

[0026] Specifically, such as Figures 1-4As shown, the copper strip 1 is provided with a first through hole 10 and a second through hole 11. The number of the first through hole 10 and the second through hole 11 can be set according to the requirements. In this application, only one set of the first through hole 10 and the second through hole 11 is provided. However, other sets of the first through hole 10 or the second through hole 11 can be provided as needed. The first through hole 10 and the second through hole both penetrate the upper and lower surfaces of the copper strip 1. The upper part 100 of the first through hole and the upper part 110 of the second through hole are formed on the side near the upper surface 12 of the copper strip. The lower part 101 of the second through hole and the lower part 111 of the second through hole are provided on the side near the lower surface. The first through hole 10 has a copper strip internal thread 102, while the second through hole 11 does not have an internal thread. The upper part of the first through hole and the upper part of the second through hole are both set in a frustum shape, that is, the cross-section is trapezoidal, while the lower part of the first through hole and the lower part of the second through hole are both set in a cylindrical shape, that is, the cross-section is rectangular or square. Therefore, the lower end radius of the upper part of the first through hole is the same as the lower end radius of the first through hole, and the lower end radius of the upper part of the second through hole is also the same as the lower end radius of the second through hole. A locking element 2 is provided in the first through hole 10. The locking element is preferably a locking screw, which includes a conical stop 23 and a locking post 22 integrally formed with the conical stop. The outer surface of the locking post is provided with a locking post external thread 24. The locking post external thread and the copper strip internal thread are compatible. Therefore, the locking element 2 can be placed in the first through hole and connected and locked with the copper strip. In order to facilitate the copper strip to be attached to the first circuit board 3 by SMT, when the locking element is completely placed in the first through hole, the upper end face 21 of the locking element is lower than the upper surface 12 of the copper strip. That is, the upper end face of the locking element will not protrude from the upper surface of the copper strip. This method makes the copper strip 1 more flat when connected to the first circuit board 3, improving the yield. A rotating groove 20 can be provided on the upper end face 21 of the locking element. By rotating the locking element 2, it can be raised or lowered in the copper strip to achieve connection or separation with the copper strip. At the same time, due to the presence of the conical stop, the locking element cannot pass through the lower part of the first through hole.

[0027] Furthermore, such as Figures 3-5 As shown, when the copper strip 1 is connected to the first circuit board 3, the upper surface 12 of the copper strip is pasted to the upper surface of the first circuit board. At this time, the first through hole can be used to fix other components or circuit boards and provide conductivity. However, it should be noted that before attaching the copper strip 1 to the first circuit board 3, the locking member 2 must be installed in the first through hole 10. Then, the copper strip 1 is attached to the first circuit board 3 by SMT. When assembling the second circuit board 4, the locking member can also be used for positioning. Since the conical stop 23 of the locking member can be safely recessed into the upper part 100 of the first through hole, it will not protrude from the upper surface of the copper strip, which is flatter than the riveting method and has a higher yield. It should be noted that the second circuit board 4 should be provided with a third through hole 40. The locking post 22 of the locking member can pass through the third through hole to connect the locking member to the second circuit board, thereby realizing the connection and conductivity between the first circuit board and the second circuit board through the copper strip to form a circuit board module.

[0028] Furthermore, such as Figure 5 As shown, when a third circuit board 5 needs to be stacked on the second circuit board 4 and conduct electricity upwards, the second and third circuit boards can be connected by copper pillars 6. A fourth through hole 50 is provided on the third circuit board. The copper pillar 6 is a double-through copper pillar with a hollow channel 60 inside. The two sides of the hollow channel are aligned with the third through hole 40 and the fourth through hole 50, respectively. An internal thread 61 is provided inside the hollow channel. The locking pin of the locking component can pass through the third through hole and extend into the hollow channel 60 to achieve a threaded connection with the internal thread 61 of the copper pillar. The third circuit board can also be connected by a separate locking component passing through the fourth through hole 50 and extending into the hollow channel 60 to achieve a threaded connection with the internal thread 61 of the copper pillar. This achieves the connection and conduction of the second and third circuit boards through the copper pillars. Alternatively, the circuit board module can be replaced with the third circuit board. In this case, the locking pin of the locking component extends into the other side of the hollow channel to achieve a threaded connection, thus achieving the stacking and conduction of four circuit boards. This allows for the infinite stacking and conduction of multiple circuit boards in the above manner. Because the locking component is made of conductive steel, it not only conducts electricity but also requires no special torque limits when tightening the double-through stud, making it less prone to breakage and requiring less skill from production workers. Furthermore, since copper is less hard than steel, if the internal threads of the copper stud become stripped, only the double-through copper stud needs to be replaced, eliminating the need to repair complex circuit boards.

[0029] Furthermore, the circuit board module can be fixed to the heat sink or other mounting brackets in conjunction with the insulating component 7, which is more secure than fixing it directly to the copper strip. The insulating component 7 includes a horizontal arm 70 and a vertical arm 71. The vertical arm is inserted into the second through hole and contacts the inner wall of the second through hole, while the horizontal arm is positioned above the upper surface 12 of the copper strip. The circuit board module is fixed to the heat sink by a locking component placed between the vertical arms 71 and passing through the second through hole, thereby improving the heat dissipation effect of the circuit board. The insulating component prevents the locking component from contacting the copper strip, the first circuit board, and the second circuit board in the second through hole. The locking component can also be set as a non-conductive locking component. In this case, the insulating component can protect the circuit board and provide a buffer when the locking component is screwed into the circuit board module. Through the above method, the distance between the second circuit board and the third circuit board can be adjusted according to the size of the locking component or the length of the locking post, thus overcoming the limitation that the original welded copper post cannot be too short. In this application, the thickness can be freely selected between 3-10mm. It should also be noted that this application only describes it as a copper strip, but the copper strip can also be replaced with conductive strips such as aluminum strips. The conductive strip is attached to the first circuit board to connect the first circuit board and the second circuit board to conduct electricity, and the current of the first circuit board is collected and transferred to the second circuit board. In this application, copper strips are preferred because copper strips have excellent conductivity and processability.

[0030] It should be understood that this application has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this application. Furthermore, based on the teachings of this application, these features and embodiments can be modified to suit specific circumstances and materials without departing from the spirit and scope of this application. Therefore, this application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this application.

Claims

1. A circuit board module based on conductive strips for circuit board stacking, comprising a first circuit board and a second circuit board, characterized in that: It also includes a conductive strip connecting the first circuit board and the second circuit board. The conductive strip has at least one first through hole with an internal thread and a locking member. The locking member includes a tapered stop and a locking post with an external thread. The second circuit board has a third through hole corresponding to the position of the first through hole. The locking post passes through the first through hole and the third through hole in sequence to lock and fix the second circuit board to the conductive strip and to electrically connect the first circuit board, the conductive strip and the second circuit board.

2. The circuit board module according to claim 1, characterized in that: When the locking member is fully screwed into the first through hole, the upper end face of the locking member does not protrude from the upper surface of the conductive strip.

3. The circuit board module according to claim 1, characterized in that: The upper part of the first through hole is frustum-shaped, and its size matches the conical stop of the locking member.

4. The circuit board module according to claim 1, characterized in that: The conductive strip is also provided with at least one set of second through holes, which are light holes used to adapt to insulating components.

5. The circuit board module according to claim 4, characterized in that: The insulating component includes a horizontal arm and a vertical arm. The vertical arm is inserted into the second through hole, and the horizontal arm presses against the upper surface of the conductive strip. The circuit board module is fixed to an external heat sink or mounting bracket by a locking member passing through the insulating component.

6. The circuit board module according to any one of claims 1-5, characterized in that: It also includes a third circuit board, which is connected to the second circuit board via a double-through stud. The double-through stud has a hollow channel with internal threads inside. The locking pin passes through the third through hole of the second circuit board and extends into one end of the hollow channel, and connects with the internal threads therein.

7. The circuit board module according to any one of claims 1-5, characterized in that: The first circuit board, the conductive strip, and the second circuit board together constitute a circuit board module, and at least two circuit board modules are stacked and connected by double through studs.

8. The circuit board module according to claim 7, characterized in that: The locking post in the lower circuit board module extends upward into and connects to one end of the hollow channel of the double stud, while the upper circuit board module is connected to the other end of the hollow channel through its own locking mechanism.

9. The circuit board module according to claim 2, characterized in that: The upper end face of the locking component is provided with a rotating groove, and the locking component is made of steel.

10. The circuit board module according to claim 1, characterized in that: The conductive strip is a copper strip.

Images