Electric lap joint structure and inductor

Abstract

The utility model relates to an electric lap joint structure and an inductor, and relates to the technical field of inductors, the electric lap joint structure comprises an aluminum core, a transition bar and a copper bar, the aluminum core comprises a vertical part and a straight part, the transition bar is arranged on the straight part of the aluminum core and is arranged between the straight part and the copper bar, and the transition bar is arranged between the vertical part and the copper bar. The aluminum core is electrically connected with the copper bar through the transition bar, and the aluminum core, the transition bar and the copper bar are fixed through bolts. The aluminum core and transition bar structure is used for replacing an all-copper inductor, aluminum serves as a material which is low in price and good in electric lead, and the production cost of the whole inductor can be reduced; the electric connection between the aluminum core and the copper bar adopts the transition bar for bridging, so that the direct contact between aluminum and copper is avoided, and the electrochemical corrosion is effectively avoided; and a bolt fixing mode is adopted, so that the complexity of a production process is reduced, the problem of material stress possibly caused by high-temperature welding can be avoided, and the reliability and stability of the inductor are further improved.

Description

Technical Field

[0001] This application relates to the field of inductor technology, and in particular to an electrical connection structure and an inductor. Background Technology

[0002] Traditional inductors are widely used in power electronics, communications, and other fields, serving important electrical functions. In inductor design, copper-core inductors are widely adopted due to their excellent conductivity and magnetic properties. However, copper-core inductors suffer from high cost and weight, limiting their competitiveness in applications with stringent cost and weight requirements. Despite the performance advantages of copper core materials, their high cost and weight make them difficult to use in miniaturized and lightweight electronic devices.

[0003] To address this issue, aluminum-core inductors have gradually emerged as an alternative. Aluminum offers lower cost and lighter weight compared to copper, but it also presents certain challenges during use. When the aluminum core connects to copper terminals, electrochemical corrosion is prone to occur, affecting not only the electrical performance of the contact surface but also reducing product reliability and lifespan. This corrosion is particularly severe under high-frequency or long-term operating conditions, impacting the overall performance and stability of the inductor.

[0004] Furthermore, existing aluminum-core inductors also have shortcomings in their structural design. Due to the small cross-section of the aluminum core, it is difficult to fix it with screws, and welding is usually used to connect the inductor core to the terminals. However, the welding process has problems such as incomplete soldering and detachment, resulting in unstable welding quality. Incomplete welding will lead to an increase in the impedance of the contact surface, thereby affecting electrical performance, especially when high-frequency current passes through, poor connection at the solder joint may lead to serious electrical failures. In addition, the thermal stress during the welding process may also cause cracks at the connection points, thus affecting the overall stability of the inductor.

[0005] Therefore, in order to improve the performance of inductors, reduce production costs, and ensure long-term stability, there is an urgent need for a new inductor structure that can solve the above problems while maintaining excellent electrical performance, thereby meeting the market demand for efficient, reliable, and cost-effective inductors. Utility Model Content

[0006] To address the issues of high cost of copper-core inductors, electrochemical corrosion of aluminum-core inductors, and poor welding, this application provides an electrical bridging structure and an inductor.

[0007] The electrical connection structure and inductor provided in this application adopt the following technical solution:

[0008] An electrical connection structure includes an aluminum core, a transition busbar, and a copper busbar. The aluminum core includes a vertical portion and a horizontal portion. The transition busbar is disposed on the horizontal portion of the aluminum core and is located between the horizontal portion and the copper busbar. The aluminum core and the copper busbar are electrically connected through the transition busbar. The aluminum core, the transition busbar, and the copper busbar are fixed together by bolts.

[0009] By adopting the above technical solution, the material cost is reduced by using an aluminum core and transition bus structure instead of an all-copper inductor. Aluminum, as a relatively inexpensive material with good conductivity, can reduce the overall production cost of the inductor. The electrical connection between the aluminum core and the copper bus is bridged by the transition bus, avoiding direct contact between aluminum and copper, thereby effectively preventing electrochemical corrosion. The use of bolt fixing not only reduces the complexity of the production process, but also avoids material stress problems that may be caused by high-temperature welding, further improving the reliability and stability of the inductor.

[0010] In one specific implementation, the straight section includes a bending transition section and a variable cross-section overlap section. The width of the variable cross-section overlap section is greater than the width of the bending transition section, and the thickness of the variable cross-section overlap section is less than the thickness of the bending transition section. The surfaces of the variable cross-section overlap section and the bending transition section near the transition row are flush.

[0011] By adopting the above technical solutions, the bending transition section has a small width and a large thickness, which plays a role in transitioning and strengthening the structural stability; the variable cross-section lap section has a large width and a small thickness, which increases the flow area and can provide a larger contact surface to enhance the stability of the electrical connection, making the contact between the aluminum core and the transition bar more stable; and the larger width of the variable cross-section lap section provides a larger installation area for subsequent bolt fixing, improving the firmness and reliability of the connection.

[0012] In one specific implementation, the bolt is fixed by passing through the variable cross-section lap joint, the transition bar, and the copper busbar in sequence, with the bolt nut abutting against the variable cross-section lap joint, and the cross-sectional area of ​​the variable cross-section lap joint being larger than the cross-sectional area of ​​the bolt nut.

[0013] By adopting the above technical solution, since the cross-sectional area of ​​the variable cross-section lap joint is larger than that of the bolt and nut, it can withstand greater mechanical pressure without deformation. When the nut is crimped, it can disperse the applied pressure through a larger contact area, so that the local area will not be deformed or damaged due to excessive pressure concentration, thereby enhancing the durability and reliability of the connecting parts.

[0014] In one specific implementation, the transition busbar includes an integrally formed aluminum layer and a copper layer, the aluminum layer being connected to the aluminum core and the copper layer being connected to the copper busbar.

[0015] By adopting the above technical solution, the copper layer is connected to the copper busbar to ensure close contact between copper materials, and the aluminum layer is connected to the aluminum core to ensure good contact between aluminum materials. The one-piece molding design of this transition busbar can ensure that there are no air gaps between the copper and aluminum contact surfaces, avoid the entry of corrosive media such as air and moisture, prevent electrochemical corrosion, thereby improving connection stability and enhancing electrical performance and safety.

[0016] In one specific implementation, the copper busbar is provided with terminals.

[0017] By adopting the above technical solution, in the actual installation process, the terminal block, as part of the copper busbar, is connected to the external cable through a pre-designed interface, ensuring a tight connection between the copper busbar and the external cable. Furthermore, it makes the process of connecting the copper busbar to the external cable simpler and faster, simplifying the installation process.

[0018] In one specific implementation scheme, a pre-fixing structure is also included, through which the aluminum core and the transition row are pre-fixed.

[0019] By adopting the above technical solution, the aluminum core and the transition busbar are initially fixed by the pre-fixed structure, which can prevent relative slippage between the aluminum core, the transition busbar and the copper busbar during the subsequent bolt tightening process, ensure that their relative positions are consistent, avoid poor contact or connection failure caused by slippage, and thus improve the overall electrical contact reliability.

[0020] In one specific implementation scheme, the pre-fixed structure includes rivets, the transition row is provided with a first through hole, the straight portion of the aluminum core is provided with a second through hole, and the rivets pass through the first through hole and the second through hole in sequence for fixing.

[0021] By adopting the above technical solution, the aluminum core and the transition strip are firmly connected by rivets. The rivets fix the two components together and prevent relative slippage when the bolts are tightened later. The rivets play a positioning and fixing role, ensuring that the aluminum core and the transition strip maintain their relative positions during installation and use.

[0022] In one specific implementation, a protrusion is provided on the outer wall of the second through hole, the protrusion is located inside the first through hole, and the protrusion is disposed along the outer periphery of the rivet and abuts against the outer wall of the rivet.

[0023] By adopting the above technical solution, the convex bulge increases the friction and contact area at the connection point by contacting the outer wall of the rivet, so that the rivet can provide a stronger fixing effect during the fixing process; the convex bulge design can provide additional support to prevent the rivet from loosening or shifting during long-term use.

[0024] An inductor includes a heat sink, a magnetic core, and an electrical connection structure as described above. The heat sink has a cavity for accommodating the magnetic core, and the electrical connection structure is mounted in the cavity and electrically connected to the magnetic core through the vertical portion of the aluminum core.

[0025] In one specific implementation, a heat-dissipating adhesive layer is also included, which is disposed in the cavity to fill the cavity and fix the aluminum core.

[0026] By adopting the above technical solution, the conductive heat-dissipating adhesive layer not only fills the cavity, but also fixes the aluminum core in a predetermined position, ensuring the internal structural stability of the inductor; in addition, the conductive heat-dissipating adhesive layer has thermal conductivity, which can conduct the heat inside the inductor to the external heat sink, providing a stable heat dissipation environment and increasing the current carrying capacity of the aluminum core.

[0027] In summary, the beneficial technical effects of this application are as follows: This electrical connection structure, through rational design, achieves a stable connection between the aluminum core, transition busbar, and copper busbar, solving the electrochemical corrosion and poor welding problems that may occur in traditional aluminum core inductors; the use of a transition busbar to bridge the aluminum core and copper busbar effectively avoids direct contact between aluminum and copper, thereby reducing the risk of corrosion; and the bolt fixing simplifies the production process, improving the reliability and stability of the inductor; furthermore, the aluminum core design reduces production costs, improves the cost-effectiveness of the inductor, and increases its service life.

[0028] By combining a heat sink and a conductive thermal adhesive layer, the entire inductor has better heat dissipation performance and structural stability, ensuring that the aluminum core can maintain a low temperature rise in high-temperature environments and effectively conduct heat, thereby enhancing the inductor's operating efficiency. This design not only improves the inductor's current carrying capacity and operating stability, but also further optimizes product performance by reducing production costs and improving reliability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the electrical connection structure and inductor in an embodiment of this application.

[0030] Figure 2 It is a front view used to show the electrical connection structure and inductor.

[0031] Figure 3 This is a structural diagram used to illustrate the aluminum core.

[0032] Figure 4 It is a sectional view used to show a pre-fixed structure.

[0033] Explanation of reference numerals in the attached drawings: 1. Electrically connected structure; 2. Aluminum core; 21. Vertical part; 22. Straight part; 221. Bending transition part; 222. Variable cross-section connecting part; 3. Transition busbar; 4. Copper busbar; 41. Terminal block; 5. Bolt; 6. Pre-fixed structure; 61. Rivet; 62. First through hole; 63. Second through hole; 64. Protrusion; 7. Heat sink; 71. Cavity; 8. Magnetic core. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0035] Example 1

[0036] Reference Figure 1 and Figure 2 This application discloses an electrical connection structure, including an aluminum core 2, a transition strip 3, and a copper busbar 4. The aluminum core 2 is composed of a vertical part 21 and a straight part 22 that are perpendicular to each other. In this embodiment, the vertical part 21 and the straight part 22 are integrally stamped. The end of the vertical part 21 is stamped and bent to form the straight part 22. The transition strip 3 and the copper busbar 4 are both horizontally arranged. The transition strip 3 overlaps on the straight part 22 of the aluminum core 2, and the copper busbar 4 overlaps on the transition strip 3. The transition strip 3 is located between the straight part 22 of the aluminum core 2 and the copper busbar 4. The aluminum core 2 and the copper busbar 4 are electrically connected through the transition strip 3, and the aluminum core 2, the transition strip 3, and the copper busbar 4 are fixed together by bolts 5.

[0037] During assembly, the transition busbar 3 is overlapped on the straight part 22 of the aluminum core 2, and the copper busbar 4 is overlapped on the transition busbar 3. Then, the aluminum core 2, the transition busbar 3, and the copper busbar 4 are connected and fixed using bolts 5. The aluminum core 2 and the copper busbar 4 are electrically connected through the transition busbar 3. When the inductor is working, the current will be conducted between the aluminum core 2 and the copper busbar 4 through the transition busbar 3. Due to the design of the transition busbar 3, direct contact between the aluminum core 2 and the copper busbar 4 can be avoided, thereby avoiding electrochemical corrosion problems that may be caused by direct connection between aluminum and copper.

[0038] Reference Figure 2 and Figure 3 In this embodiment, the straight portion 22 includes a bending transition portion 221 and a variable cross-section overlap portion 222. The straight portion 22 is connected to the vertical portion 21 through the bending transition portion 221. In this embodiment, the end of the vertical portion 21 is punched and bent to form the bending transition portion 221 and the variable cross-section overlap portion 222. The variable cross-section overlap portion 222 is punched and flattened to perform variable cross-section treatment, increasing the width from 12mm to 17mm, decreasing the thickness from 4mm to 2.8mm, keeping the length unchanged at 25mm, and increasing the cross-sectional area from 300mm2 to 425mm2.

[0039] The width of the variable cross-section overlap 222 is greater than the width of the bending transition 221, the thickness of the variable cross-section overlap 222 is less than the thickness of the bending transition 221, and the surfaces of the variable cross-section overlap 222 and the bending transition 221 are flush with the side surfaces of the transition row 3.

[0040] The bending transition section 221 has a small width and a large thickness, mainly serving as a transition and enhancing structural stability; the variable cross-section overlapping section 222 has a large width and a small thickness, increasing the flow area and providing a larger contact surface to enhance the stability of the electrical connection, making the contact between the aluminum core 2 and the transition row 3 more stable; in addition, the larger width of the variable cross-section overlapping section 222 can provide a larger installation area for subsequent bolt 5 fixing, ensuring that the bolt 5 can better fix the connection between the aluminum core 2 and the transition row 3, further improving the strength and reliability of the connection.

[0041] Reference Figure 1 and Figure 2 In this embodiment, the bolt 5 is vertically arranged and passes through the variable cross-section lap joint 222, the transition strip 3, and the copper strip 4 in sequence for fixation. The nut of the bolt 5 abuts against the variable cross-section lap joint 222, and the cross-sectional area of ​​the variable cross-section lap joint 222 is greater than the cross-sectional area of ​​the nut of the bolt 5. In this embodiment, the bolt 5 is a flanged bolt 5, and the nut abuts against the variable cross-section lap joint 222 through the flange, and the cross-sectional area of ​​the variable cross-section lap joint 222 is greater than the cross-sectional area of ​​the flange.

[0042] When the nut is tightened, the variable cross-section lap joint 222 can provide sufficient contact surface to withstand the pressure of the nut and effectively disperse the stress applied to the connection. Since the cross-sectional area of ​​the variable cross-section lap joint 222 is larger than the cross-sectional area of ​​the bolt 5 nut, it can withstand greater mechanical pressure without deformation. When the nut is crimped, it can disperse the applied pressure through a larger contact area, so that the local area will not be deformed or damaged due to excessive pressure concentration, thus enhancing the durability and reliability of the connection components.

[0043] Reference Figure 1 and Figure 2 The transition busbar 3 includes an integrally formed aluminum layer and a copper layer, which are stacked together. The aluminum layer is connected to the aluminum core 2 to ensure good contact between the aluminum materials, and the copper layer is connected to the copper busbar 4 to ensure tight contact between the copper materials. The integrally formed design of the transition busbar 3 ensures that there are no air gaps between the copper and aluminum contact surfaces, preventing the entry of corrosive media such as air and moisture, preventing electrochemical corrosion, thereby improving connection stability and enhancing electrical performance and safety.

[0044] The copper busbar 4 is provided with a terminal block 41. In this embodiment, one end of the copper busbar 4 extends into a transition busbar 3 and is provided with a terminal block 41. The terminal block 41, as part of the copper busbar 4, is connected to the external cable through a pre-designed interface to ensure a tight connection between the copper busbar 4 and the external cable, avoid poor contact, and provide an efficient and reliable electrical connection. Furthermore, the design of the terminal block 41 makes the process of connecting the copper busbar 4 to the external cable simpler and faster, which not only simplifies the installation process but also reduces the cost of daily maintenance.

[0045] Reference Figure 1 and Figure 2 This application also provides an inductor that uses the electrical connection structure 1 described above. The inductor includes a heat sink 7 and a magnetic core 8. The heat sink 7 has a cavity 71 for accommodating the magnetic core 8. The electrical connection structure 1 is installed in the cavity 71 and is electrically connected to the magnetic core 8 through the vertical portion 21 of the aluminum core 2. In this embodiment, the connection between the vertical portion 21 of the aluminum core 2 and the magnetic core 8 includes, but is not limited to, a concave-convex limiting structure, that is, the vertical portion 21 of the aluminum core 2 is inserted into a groove designed on the magnetic core 8 for connection and fixation. The use of the electrical connection structure 1 enables the inductor to improve its working efficiency and reliability while reducing costs.

[0046] The inductor also includes a thermal adhesive layer, which is disposed inside the cavity 71 to fill the cavity 71 and fix the aluminum core 2. The conductive thermal adhesive layer not only fills the cavity 71, but also fixes the aluminum core 2 in a predetermined position, so that the aluminum core 2 will not be displaced due to vibration or external force when the inductor is working, ensuring the internal structural stability of the inductor and improving the reliability and efficiency of the inductor. In addition, the conductive thermal adhesive layer has thermal conductivity, which can effectively conduct the heat inside the inductor to the external heat sink 7, providing a stable heat dissipation environment, increasing the current carrying capacity of the aluminum core 2, so that the aluminum core 2 can carry a larger current, and improving the overall performance and efficiency of the inductor.

[0047] The implementation principle of this application embodiment is as follows: During the assembly of the electrical connection structure 1, the surface of the aluminum layer on one side of the transition bus 3 is overlapped on the straight part 22 of the aluminum core 2, and then the copper bus 4 is overlapped on the copper layer of the transition bus 3. The aluminum core 2, the transition bus 3 and the copper bus 4 are connected and fixed using bolts 5. At this time, the transition bus 3 acts as a bridge connecting the aluminum core 2 and the copper bus 4. Then, the inductor is assembled. Specifically, the aluminum core 2 of the electrical connection structure 1 is installed into the cavity 71 of the heat sink 7. The vertical part 21 of the aluminum core 2 is connected and fixed to the magnetic core 8 by the limiting structure. Then, the cavity 71 is potted to form a heat dissipation adhesive layer. The heat dissipation adhesive layer can help fix the position of the aluminum core 2 in the electrical connection structure 1. Then, according to actual needs, external wiring is performed. The external cable is connected to the copper bus 4 of the electrical connection structure 1 and connected and fixed through the terminal 41 on the copper bus 4.

[0048] When the inductor is working, the current flows through the external wire to the terminal 41 of the copper busbar 4, through the transition busbar 3 from the copper busbar 4 to the straight part 22 of the aluminum core 2, and then from the vertical part 21 of the aluminum core 2 to the magnetic core 8. The magnetic field strength inside the inductor changes with the change of current, and the magnetic core 8 changes its magnetic field storage and release characteristics accordingly, thereby realizing the function of inductance.

[0049] The inductor and electrical connection structure 1 of this application, through optimized design, effectively reduce costs while improving the stability and service life of the inductor, successfully solving common problems such as electrochemical corrosion and poor welding in traditional aluminum core 2 inductors. Specifically, the technical advantages of this inductor are reflected in the following aspects: First, by using an aluminum core 2 and transition bus 3 structure to replace the all-copper inductor, the low cost and excellent conductivity of aluminum significantly reduce production costs, thereby solving the problem of excessively high costs for copper core inductors; Second, the transition bus 3 bridges the electrical connection between the aluminum core 2 and the copper bus 4, avoiding direct contact between aluminum and copper, effectively preventing electrochemical corrosion and improving the durability and reliability of the inductor; In addition, the use of bolts 5 for fixing reduces the complexity of the production process and avoids material stress problems that may be caused by high-temperature welding, further enhancing the reliability and stability of the inductor; Finally, the inductor of this application can maintain a low temperature rise in high-temperature environments, further improving its working efficiency and long-term stable operation capability.

[0050] Example 2

[0051] Reference Figure 4 The difference between this embodiment and Embodiment 1 is that the electrical connection structure 1 further includes a pre-fixing structure 6, through which the aluminum core 2 and the transition strip 3 are pre-fixed; the pre-fixing structure 6 includes, but is not limited to, a welding structure, a riveting structure, a screw-on structure, and a snap-fit ​​limiting structure. The specific structure is as follows:

[0052] Welded structure: By using spot welding or laser welding technology to fix the aluminum layer of the transition row 3 to the aluminum core 2 at the contact surface, a strong welded structure is formed between the aluminum core 2 and the aluminum layer of the transition row 3, ensuring the connection strength, avoiding relative slippage or loosening between the transition row 3 and the aluminum core 2, and increasing the stability of the electrical connection.

[0053] Riveting structure: By designing through holes on the transition strip 3 and the aluminum core 2, and connecting them with rivets 61, a strong riveting structure is formed. The aluminum core 2 and the transition strip 3 can be firmly fixed under mechanical force, preventing positional changes due to loosening of subsequent fasteners, and ensuring high stability and reliability of electrical connection.

[0054] Threaded structure: The connection between the transition strip 3 and the aluminum core 2 is designed with matching threaded holes and connected by bolts 5 to form a firm threaded structure. The bolt 5 connection is detachable, which facilitates subsequent maintenance and adjustment. The continuous tightening of bolts 5 can effectively prevent loosening during long-term use.

[0055] The snap-fit ​​limiting structure: The aluminum core 2 and the transition row 3 are designed with a concave-convex fit structure. The aluminum layer of the transition row 3 has an elastic buckle facing downwards. The flat part 22 of the aluminum core 2 is provided with a slot. The elastic buckle is inserted into the slot and can automatically lock in the slot through its own elasticity, forming a preliminary fixation. The snap-fit ​​limiting structure provides a preliminary fixation without the need for any additional fasteners, preventing relative slippage between the aluminum core 2 and the transition row 3.

[0056] Reference Figure 4 In this embodiment, the pre-fixed structure 6 is fixed by a riveting structure. The riveting structure includes rivets 61, the transition row 3 is provided with a first through hole 62, and the straight part 22 of the aluminum core 2 is provided with a second through hole 63. In this embodiment, the second through hole 63 is provided on the bent transition part 221 of the straight part 22. The rivets 61 pass through the first through hole 62 and the second through hole 63 in sequence for fixing. Through the connection of the rivets 61, the aluminum core 2 and the transition row 3 are firmly fixed together to prevent relative slippage when the bolts 5 are tightened. The rivets 61 play a positioning and fixing role to ensure that the aluminum core 2 and the transition row 3 maintain their relative positions during the subsequent installation with the copper busbar 4.

[0057] In this embodiment, a protrusion 64 is provided on the outer wall of the second through hole 63. The protrusion 64 is located inside the first through hole 62. The protrusion 64 is arranged along the outer periphery of the rivet 61 and abuts against the outer wall of the rivet 61. By contacting the outer wall of the rivet 61, the protrusion 64 can increase the friction and contact area at the connection, so that the rivet 61 can provide a stronger fixing effect during the fixing process. In addition, the design of the protrusion 64 can provide additional support to prevent the rivet 61 from loosening or shifting during long-term use.

[0058] The implementation principle of this embodiment is as follows: During the assembly process, the transition row 3 and the aluminum core 2 are pre-fixed first. The straight part 22 of the transition row 3 and the aluminum core 2 are aligned to ensure that the first through hole 62 of the transition row 3 and the second through hole 63 of the aluminum core 2 are connected. After alignment, the aluminum layer side of the transition row 3 is overlapped on the straight part 22. Then, the rivets 61 are inserted into the first through hole 62 of the transition row 3 and the second through hole 63 of the aluminum core 2 in sequence to form a fixed connection. During this process, the protrusion 64 on the outer wall of the first through hole 62 contacts the rivet 61, which enhances the fixing effect.

[0059] After the rivet 61 is fixed, the aluminum core 2, transition row 3 and copper busbar 4 are fixed. The copper busbar 4 is overlapped on the copper layer of the transition row 3. The transition row 3 and copper busbar 4 are connected and fixed by bolt 5. Ensure that the relative positions of the aluminum core 2, transition row 3 and copper busbar 4 are correct (the specific fixing method can be referred to Example 1).

[0060] This embodiment improves the connection stability between the aluminum core 2 and the copper busbar 4 by adding a pre-fixed structure 6. The pre-fixed structure 6 initially fixes the aluminum core 2 and the transition busbar 3 with rivets 61, which can prevent relative slippage between the aluminum core 2, the transition busbar 3 and the copper busbar 4 during the subsequent bolt 5 tightening process, ensuring that their relative positions remain consistent, thereby avoiding poor contact or connection failure, enhancing the reliability of the electrical connection, and ensuring stability and durability in long-term use.

[0061] Meanwhile, the use of rivets 61 not only securely fixes the aluminum core 2 to the transition row 3, but also enhances the friction and contact area through the design of the convex 64, making the connection more stable. The presence of the convex 64 provides additional support to prevent the rivets 61 from loosening or shifting during long-term use, further ensuring the long-term stability of the connection.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electrical lap joint structure, characterized in that: The device includes an aluminum core, a transition busbar, and a copper busbar. The aluminum core includes a vertical portion and a horizontal portion. The transition busbar is disposed on the horizontal portion of the aluminum core and is located between the horizontal portion and the copper busbar. The aluminum core and the copper busbar are electrically connected through the transition busbar. The aluminum core, the transition busbar, and the copper busbar are fixed together by bolts.

2. The electrical overlap structure according to claim 1, characterized in that: The straight section includes a bending transition section and a variable cross-section overlap section. The width of the variable cross-section overlap section is greater than the width of the bending transition section, and the thickness of the variable cross-section overlap section is less than the thickness of the bending transition section. The surfaces of the variable cross-section overlap section and the bending transition section are flush with the side of the transition row.

3. The electrical overlap structure according to claim 2, characterized in that: The bolt passes sequentially through the variable cross-section lap joint, the transition bar, and the copper busbar for fixation. The bolt nut abuts against the variable cross-section lap joint, and the cross-sectional area of ​​the variable cross-section lap joint is larger than the cross-sectional area of ​​the bolt nut.

4. The electrical lap joint structure according to claim 1, characterized in that: The transition busbar includes an integrally formed aluminum layer and a copper layer, the aluminum layer being connected to the aluminum core and the copper layer being connected to the copper busbar.

5. The electrical lap joint structure according to claim 1, characterized in that: The copper busbar is equipped with wiring terminals.

6. The electrical lap joint structure according to claim 1, characterized in that: It also includes a pre-fixing structure, through which the aluminum core and the transition row are pre-fixed.

7. The electrical lap joint structure according to claim 6, characterized in that: The pre-fixed structure includes rivets, the transition row is provided with a first through hole, the straight part of the aluminum core is provided with a second through hole, and the rivets pass through the first through hole and the second through hole in sequence for fixing.

8. The electrical lap joint structure according to claim 7, characterized in that: The second through hole has a protrusion on its outer wall. The protrusion is located inside the first through hole and is arranged along the outer periphery of the rivet and abuts against the outer wall of the rivet.

9. An inductor, characterized in that: The device includes a heat sink, a magnetic core, and an electrical connection structure as described in any one of claims 1-8, wherein the heat sink has a cavity for accommodating the magnetic core, the electrical connection structure is installed in the cavity, and is electrically connected to the magnetic core through the vertical portion of the aluminum core.

10. The inductor according to claim 9, characterized in that: It also includes a heat-dissipating adhesive layer, which is disposed in the cavity and is used to fill the cavity and fix the aluminum core.

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