Double-arm laminated aluminum alloy terminal

Abstract

The invention discloses a double-arm laminated aluminum alloy terminal, and relates to the technical field of automobile connectors, the double-arm laminated aluminum alloy terminal comprises a socket terminal and a plug terminal matched with the socket terminal, the tail parts of the laminated terminals and the tail part of the plug terminal are respectively connected with corresponding aluminum conductor structures, the socket terminal comprises two laminated terminals which are symmetrically arranged, and the two laminated terminals are respectively connected with the corresponding aluminum conductor structures. The head part of the laminated terminal is in plugging cooperation with the head part of the socket terminal. The middle part of the laminated terminal is provided with a deformation transition part used for increasing the contact stability with the plug terminal. The electric connector is reliable and stable in structure, light in product weight, good in conductivity and reliable in electric contact performance, the aluminum conductor structure is an aluminum or aluminum alloy wire or an aluminum row, the plug terminals and the socket terminals are made of aluminum alloy materials, the metal surfaces of the plug terminals and the socket terminals are exposed, and contact positions are plated with silver or silver-nickel alloy. The socket terminals and the plug terminals are welded with the corresponding aluminum conductor structures through ultrasonic waves, and the problem that connection between traditional terminals and aluminum conductors is difficult is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile connectors, in particular to a double-arm laminated aluminum alloy terminal. Background Art

[0002] With the increasing electrification of automobiles, electrical terminals in automotive wiring harness connection systems are key components, and their performance and reliability directly affect the stable operation of the entire vehicle's electrical system. Currently, due to the demand for lightweight vehicle bodies, the specifications of automotive electrical terminals are becoming smaller and smaller. The automotive industry's pursuit of lightweighting has made aluminum alloy terminals an important alternative to traditional copper terminals. However, aluminum alloy terminals still face many challenges in terms of electrical contact performance and vibration resistance. Smaller and smaller terminals place increasingly stringent requirements on design and manufacturing processes. Simply reducing terminal specifications not only increases manufacturing costs, but also reduces production efficiency and places excessive demands on product quality control.

[0003] In the prior art, common terminal structures primarily consist of a plug terminal and a receptacle terminal. For example, publication number CN106848666A discloses a plug terminal comprising a base and a head formed at the front end of the base. The junction of the base and head forms an inclined surface, with the front end of the inclined surface forming the head region and the rear end forming the base region. The outer diameter of the head region is smaller than that of the base region. While this structure can achieve basic plug-in / out functionality, it still suffers from limitations in terms of vibration resistance and electrical contact stability.

[0004] For example, publication number WO2023217175A1 discloses a sealed spring-type socket terminal, comprising a crimping tail and a body. The body comprises a pressing plate and a first spring. The first spring is formed by bending the end of the body and is provided with a first bent protrusion. When the plug pin of the plug terminal is inserted, the side wall of the pin abuts against the first bent protrusion. This structure increases connection stability through the bent protrusion, but the application of aluminum alloy materials is insufficient, and reliability in high-vibration environments needs to be improved.

[0005] For example, Chinese patent publication number CN213959274U discloses a high-current transmission assembly for an electrical connector, comprising a plug terminal and a socket terminal. One end of the plug terminal is movably provided with a conductive structure, and the socket terminal is provided with at least two plug interfaces in different directions. The end of the plug terminal provided with the conductive structure is plugged into the socket terminal through the plug interface. Although this patent designs the U-shaped spring, socket terminal, and plug terminal as three separate components, which not only facilitates assembly but also reduces the difficulty of processing the socket terminal mold and reduces costs, this patent is not applicable to miniaturized terminals and does not address the problems of high manufacturing costs and low production efficiency of miniaturized terminals.

[0006] Existing terminal structures present the following major challenges: First, the shrinking size of automotive electrical connectors places higher demands on design and manufacturing processes. This miniaturization trend exponentially increases manufacturing costs, reduces production efficiency, and places excessively high demands on product quality control. Second, when using aluminum alloy, existing terminal structures fail to fully consider its lower conductivity compared to copper and its susceptibility to surface oxidation, resulting in unstable electrical contact. Furthermore, in the high-vibration environment of automobiles, the vibration resistance and contact reliability of existing terminal structures fail to meet practical requirements. In particular, the balance between lightweighting and high performance remains to be effectively addressed.

[0007] Therefore, there is an urgent need to develop a new double-arm laminated aluminum alloy terminal structure that can achieve lightweight while improving the electrical contact performance and vibration resistance of the terminal through innovative structural design to meet the increasingly stringent usage requirements of automotive electrical systems. Summary of the Invention

[0008] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a double-arm laminated aluminum alloy terminal, which solves the problems of high manufacturing cost and low production efficiency of miniaturized terminals in the prior art.

[0009] The technical solution of the present invention is implemented as follows: a double-arm laminated aluminum alloy terminal includes a socket terminal and a plug terminal matching the socket terminal, the tail of the socket terminal and the tail of the plug terminal are respectively connected to corresponding aluminum conductor structures, the socket terminal includes two symmetrically arranged laminated terminals, the head of the laminated terminal is plugged into the head of the socket terminal, and the middle of the laminated terminal is provided with a deformation transition portion for increasing the contact stability with the plug terminal.

[0010] Further preferably, the inner side surfaces of the two stacked terminal heads are each provided with at least two ridges, and the outer side surfaces of the two stacked terminal heads are each provided with grooves corresponding to the ridges.

[0011] Further preferably, the deformation transition portion includes at least one lower curved spring and an upper curved spring spaced apart from the lower curved spring. Before the plug terminal and the socket terminal are inserted into place, the lower curved springs of the two stacked terminals are deformed and contact each other; after the plug terminal and the socket terminal are inserted into place, the lower curved springs of the two stacked terminals do not contact each other.

[0012] Furthermore, the inner side surfaces of the tail portions of the two stacked terminals are provided with a plurality of evenly distributed S-shaped protrusions 1, and the outer side surfaces of the tail portions of the two stacked terminals are provided with S-shaped grooves 1 that match the S-shaped protrusions 1.

[0013] Further preferably, the S-shaped protrusions are arranged in N rows and M columns, N≥4, M≥1, the S-shaped protrusions at the tail of the stacking terminal cooperate with the S-shaped welding grooves provided on the corresponding aluminum conductor structure, and the tail of the stacking terminal is ultrasonically welded to the corresponding aluminum conductor structure.

[0014] Furthermore, the end of the plug terminal is provided with an arc-shaped contact surface that contacts and cooperates with the lower curved spring.

[0015] Furthermore, concave ridges cooperating with the convex ridges are provided on the upper and lower side surfaces of the plug terminal head. When the plug terminal and the socket terminal are inserted into place, the arc-shaped contact surface contacts the lower spring. At this time, the cooperating parts of the concave ridges and the convex ridges contact in front of the center line of the cross section.

[0016] Further preferably, the convex ridges and the concave ridges are provided with a silver plating layer or a silver-nickel plating layer for increasing the electrical connection between the socket terminal and the plug terminal.

[0017] Furthermore, a plurality of evenly distributed S-shaped protrusions 2 are provided on the lower side of the tail of the plug terminal, and a second S-shaped groove corresponding to the second S-shaped protrusions is provided on the lower side of the tail of the plug terminal.

[0018] Further preferably, the S-shaped protrusions 2 are arranged in H rows and W columns, H≥3, W≥1, the S-shaped protrusions 2 at the tail of the plug terminal match the S-shaped welding grooves 2 on the corresponding aluminum conductor structure, and the tail of the plug terminal is ultrasonically welded to the corresponding aluminum conductor structure.

[0019] The beneficial effects of the present invention are: 1. The present invention has a reliable and stable structure, light product weight, good electrical conductivity and reliable electrical contact performance. The arc-shaped transition portion adopts the upper and lower springs stacking technology to improve the terminal electrical contact performance and vibration resistance.

[0020] 2. The tail of the terminal is ultrasonically welded to the aluminum or aluminum alloy conductor. The tail of the terminal is ultrasonically welded to the aluminum or aluminum alloy conductor, which solves the problem of difficult connection between traditional terminals and aluminum conductors.

[0021] 3. The convex ridges of the stacking terminals and the concave ridges of the plug terminals are plated with silver or silver-nickel alloy to provide stable and reliable electrical contact.

[0022] 4. Before the plug terminal and the socket terminal are fully inserted, the lower springs of the upper and lower overlapping terminals of the socket terminal are deformed and contact each other, which can effectively reduce the insertion force of the terminals and increase assembly comfort.

[0023] 5. After the plug terminal and the socket terminal are fully inserted, the lower curved springs of the upper and lower overlapping terminals of the socket terminal no longer contact each other, and the overlapping springs no longer generate interaction force. The force generated by the deformation of the springs acts completely on the plug terminal, providing sufficient contact force for the terminal contact and ensuring stable and reliable contact.

[0024] 6. After the plug terminal and the socket terminal are properly inserted, the lower curved springs of the upper and lower overlapping terminals of the socket terminal are deformed and contact the curved surface of the plug terminal. The deformation of the lower curved spring provides horizontal force for the plug terminal. The contact force generated by the combined force of the horizontal force and the positive pressure is greater than the positive pressure perpendicular to the surface of the plug terminal of the traditional terminal. After the terminals are inserted, the convex and concave edges contact in front of the center line of the cross section, thereby increasing their contact stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the double-arm laminated aluminum alloy terminal of the present invention; Figure 2 It is a structural schematic diagram of the socket terminal of the present invention; Figure 3 It is a structural schematic diagram of the plug terminal of the present invention; Figure 4 is a cross-sectional view of the present invention; Figure 5 It is a schematic diagram of the contact force after the terminal of the present invention is assembled in place.

[0027] Explanation of the accompanying drawings: 1. Aluminum conductor structure, 11. S-type welding groove 1, 12. S-type welding groove 2, 2. Stacked terminal, 21. S-type groove 1, 22. Upper curved spring, 23. Lower curved spring, 24. Protruding ridge, 25. Groove, 26. S-type protrusion 1, 3. Plug terminal, 31. Concave ridge, 32. S-type groove 2, 33. S-type protrusion 2, 34. Arc-shaped contact surface. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0029] like Figure 1 and Figure 4As shown in Example 1, a double-arm laminated aluminum alloy terminal comprises a socket terminal and a plug terminal 3 mating with the socket terminal. The tail of the socket terminal and the tail of the plug terminal 3 are each connected to a corresponding aluminum conductor structure 1. The socket terminal includes two symmetrically arranged laminated terminals 2, the heads of the laminated terminals 2 plugging with the heads of the socket terminal. The heads of the two laminated terminals 2 cooperate to form a socket terminal that plugs with the heads of the socket terminal. The middle portion of the laminated terminal 2 is provided with a deformation transition portion to enhance contact stability with the plug terminal 3. The symmetrical arrangement of the two laminated terminals 2 and the plug terminal 3 ensures a stable and reliable connection. The structure is reliable and stable, the product is lightweight, and has good electrical conductivity and reliable electrical contact performance. The aluminum conductor structure 1 is an aluminum or aluminum alloy wire or aluminum busbar. The plug terminal 3 and the socket terminal are made of aluminum alloy material, with exposed metal surfaces and silver or silver-nickel alloy plated contact areas. The socket terminal and the plug terminal 3 are ultrasonically welded to the corresponding aluminum conductor structure 1, solving the problem of difficult connection between traditional terminals and aluminum conductors.

[0030] Specifically, the plug terminal 3 and the receptacle terminal are made of an aluminum alloy material, selected from 2000 series aluminum alloy, 5000 series aluminum alloy, 6000 series aluminum alloy, and 7000 series aluminum alloy. The receptacle terminal comprises two symmetrically arranged, laminated terminals 2, with the tails of the two laminated terminals 2 ultrasonically welded to the aluminum conductor or aluminum busbar to form a single piece.

[0031] like Figure 2 and Figure 4 As shown, Example 2 is a double-arm laminated aluminum alloy terminal. Unlike the technical solution of Example 1, the inner side surfaces of the heads of the two laminated terminals 2 are each provided with at least two ridges 24, and the outer side surfaces of the heads of the two laminated terminals 2 are each provided with grooves 25 corresponding to the ridges 24. The ridges are plated with silver or silver-nickel alloy, and the ridges 24 are arranged in parallel in a direction perpendicular to the insertion direction of the laminated terminals 2 to enhance friction and stability when in contact with the plug terminals 3.

[0032] In this embodiment, the deformation transition portion includes at least one lower curved spring 23 and an upper curved spring 22 spaced apart from the lower curved spring 23. Before the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 are deformed and contact each other. After the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 do not contact each other. The lower curved springs 23 and the upper curved springs 22 spaced apart together form an elastic contact structure, ensuring good contact pressure during the plugging process. The multiple upper curved springs 22 and lower curved springs 23 provided in the middle of the socket terminal provide additional elastic support for the socket terminal, making the plugging more stable and effectively improving the terminal's vibration resistance. At the same time, this design provides sufficient elastic support during the plugging process and maintains good electrical isolation after full plugging.

[0033] In this embodiment, the inner side surfaces of the opposing tail portions of the two stacked terminals 2 are each provided with a plurality of evenly distributed S-shaped protrusions 26. The outer side surfaces of the opposing tail portions of the two stacked terminals 2 are each provided with S-shaped grooves 21 that mate with the S-shaped protrusions 26. The S-shaped protrusions 26 on the tail portions of the stacked terminals 2 mate with the S-shaped weld grooves 11 provided on the corresponding aluminum conductor structure 1, and the tail portions of the stacked terminals 2 are ultrasonically welded to the corresponding aluminum conductor structure 1. The S-shaped protrusions 26 and the stacked terminals 2 form an integrated structure, and the overall structure works synergistically to improve insertion stability.

[0034] The other structures are the same as those in Example 1.

[0035] like Figure 3 、 Figure 4 and Figure 5 As shown, Example 3 is a double-arm laminated aluminum alloy terminal. Unlike the technical solution of Example 2, the end of the plug terminal 3 that plugs into the receptacle terminal is provided with a curved contact surface 34 that mates with the lower curved spring 23. The head of the plug terminal 3 has a curved contact surface 34, which forms a good electrical connection when in contact with the ridge 24 of the laminated terminal 2.

[0036] In this embodiment, concave ridges 31 are provided on both the upper and lower sides of the head of the plug terminal 3, which mate with the convex ridges 24. When the plug terminal 3 and the receptacle terminal are properly inserted, the arcuate contact surface 34 contacts the lower curved spring 23, with the concave ridges 31 and convex ridges 24 contacting each other in front of the cross-sectional centerline. The convex ridges 24 and concave ridges 31 are coated with silver or silver-nickel plating to enhance the electrical connection between the receptacle terminal and the plug terminal 3. The use of silver or silver-nickel plating improves the electrical conductivity of the convex ridges 24 and concave ridges 31, thereby ensuring reliable electrical contact between the plug terminal 3 and the receptacle terminal. The double-arm laminated aluminum alloy terminal generates multiple forces during insertion, including horizontal force, positive pressure, and contact force. When the plug terminal 3 is inserted into the receptacle terminal, the deformation transition portion of the laminated terminal 2 undergoes elastic deformation, generating inward positive pressure. The engagement of the convex ridges 24 and concave grooves 25 generates horizontal friction. These two forces work together to form a stable contact force, ensuring a reliable and stable electrical connection.

[0037] The lower side of the rear end of the plug terminal 3 is provided with several evenly distributed S-shaped protrusions 33, and the lower side of the rear end of the plug terminal 3 is provided with S-shaped grooves 32 corresponding to the S-shaped protrusions 33. The S-shaped protrusions 33 and the plug terminal 3 are an integrated structure, and the overall structure works together to improve the stability of the plug connection.

[0038] Specifically, before the plug terminal 3 and the socket terminal are inserted into place, the lower curved springs 23 of the upper and lower stacked terminals 2 of the socket terminal are deformed and contact each other, which can effectively reduce the insertion force of the terminals and increase assembly comfort. After the plug terminal 3 and the socket terminal are inserted into place, the lower curved springs 23 of the upper and lower stacked terminals 2 of the socket terminal no longer contact each other, and the stacked springs no longer generate interaction force. The force generated by the deformation of the springs acts entirely on the plug terminal 3, providing sufficient contact force for the terminals and ensuring stable and reliable contact. After the plug terminal 3 and the socket terminal are inserted into place, the lower curved springs 23 of the upper and lower stacked terminals 2 of the socket terminal are deformed and contact the curved surface of the plug terminal 3. The deformation of the lower curved spring 23 provides horizontal force to the plug terminal 3. The contact force generated by the combined force of the horizontal force and the positive pressure is greater than the positive pressure perpendicular to the surface of the plug terminal 3 of the traditional terminal, so that after the terminals are inserted, the convex ridge 24 and the concave ridge 31 contact in front of the cross-sectional centerline, thereby increasing their contact stability.

[0039] The other structures are the same as those in Example 2.

[0040] In practice, the insertion process of the double-arm laminated aluminum alloy terminal is as follows: First, align the head of the plug terminal 3 with the opening of the socket terminal, then insert the socket terminal axially. During insertion, the groove 25 of the plug terminal 3 gradually aligns and engages with the ridge 24 of the laminated terminal 2. Simultaneously, the deformation transition portion of the laminated terminal 2 undergoes elastic deformation, causing the lower curved spring 23 near the head of the laminated terminal 2 to closely contact the curved contact surface 34 of the plug terminal 3 and exert a compressive force on the curved contact surface 34. This fully engages the ridge 24 and groove 25 of the inserted socket terminal, forming a mechanical lock that prevents the terminal from loosening or falling off during use.

[0041] The advantages of this double-arm stacked structure are: first, the elastic deformation of the transition zone ensures stable contact pressure during insertion; second, the meshing of ridges 24 and grooves 25 enhances the mechanical locking effect, preventing accidental separation. Furthermore, the design of S-shaped protrusions 1 26 and 2 33 increases the contact area and welding stability, reducing contact resistance and improving conductivity. This overall structure is suitable for connecting aluminum alloy conductors, resolving the technical issues of aluminum alloy terminals that can easily loosen and cause poor contact during long-term use.

[0042] like Figure 1 and Figure 4As shown in Example 4, a double-arm laminated aluminum alloy terminal comprises a socket terminal and a plug terminal 3 mating with the socket terminal. The tail of the socket terminal and the tail of the plug terminal 3 are each connected to a corresponding aluminum conductor structure 1. The socket terminal includes two symmetrically arranged laminated terminals 2, the heads of the laminated terminals 2 plugging with the head of the socket terminal. The heads of the two laminated terminals 2 cooperate to form a socket terminal that plugs with the head of the socket terminal. The middle portion of the laminated terminal 2 is provided with a deformation transition portion to enhance contact stability with the plug terminal 3. The aluminum conductor structure 1 is an aluminum or aluminum alloy wire or aluminum bar. The plug terminal 3 and the socket terminal are made of aluminum alloy material, with exposed metal surfaces and silver or silver-nickel alloy-plated contact areas. The socket terminal and the plug terminal 3 are ultrasonically welded to the corresponding aluminum conductor structure 1, solving the problem of difficult connection between traditional terminals and aluminum conductors. The structure is reliable and stable, the product is lightweight, and has good conductivity and reliable electrical contact performance.

[0043] Two or three parallel rows of ridges 24 are arranged on the opposing sides of the heads of the two stacked terminals 2. The other side of the heads of the two stacked terminals 2 is provided with grooves 25 corresponding to the ridges 24. The grooves 25 provide space for deformation during mating of the stacked terminals 2, further enhancing the stability of the connection between the receptacle terminal and the plug terminal 3. The ridges 24 are arranged vertically along the insertion direction of the stacked terminals 2 to enhance friction and stability during contact with the plug terminal 3.

[0044] The deformation transition portion includes at least one lower curved spring 23 and an upper curved spring 22 spaced apart from the lower curved spring 23. Before the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 are deformed and contact each other. After the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 do not contact each other. The lower curved springs 23 and the upper curved springs 22 are spaced apart to form an elastic contact structure, ensuring good contact pressure during the plugging process. The multiple lower curved springs 23 set in the middle of the socket terminal provide additional elastic support for the socket terminal, making the plugging more stable and effectively improving the terminal's vibration resistance. At the same time, this design ensures sufficient elastic support during the plugging process and maintains good electrical isolation after full plugging.

[0045] The inner side surfaces of the tails of the two stacked terminals 2 are each provided with an S-shaped protrusion 26, and the outer side surfaces of the tails of the two stacked terminals 2 are each provided with an S-shaped groove 21 that mates with the S-shaped protrusion 26. The protrusions work in conjunction with the overall structure of the plug terminal 3 to improve insertion stability. The S-shaped protrusions 26 are arranged in N rows and M columns, where N ≥ 4 and M ≥ 1. The S-shaped protrusions 26 on the tails of the stacked terminals 2 mate with the S-shaped weld grooves 11 provided on the corresponding aluminum conductor structure 1, and the tails of the stacked terminals 2 are ultrasonically welded to the corresponding aluminum conductor structure 1. The weld grooves facilitate a secure connection with the aluminum conductor structure 1. This design increases the welding area and welding strength, improving the reliability of the connection between the terminals and the aluminum conductor structure 1. Before the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 deform and contact each other; after the plug terminal 3 and the socket terminal pair are inserted into place, the lower curved springs 23 of the two stacked terminals 2 no longer contact each other. This design provides sufficient elastic support during the plugging process and maintains good electrical isolation after full plugging.

[0046] The end of the plug terminal 3 is equipped with a curved contact surface 34 that mates with the lower curved spring 23. The head of the plug terminal 3 features a curved contact surface 34, which forms a strong electrical connection when in contact with the ridge 24 of the laminated terminal 2. Both upper and lower surfaces of the head of the plug terminal 3 are provided with concave ridges 31 that mate with the ridges 24. When the plug terminal 3 is properly inserted into the receptacle terminal, the curved contact surface 34 contacts the lower curved spring 23. At this point, the mating portion of the concave ridge 31 and the ridge 24 contacts forward of the cross-sectional centerline. This design ensures precise positioning and a secure connection during insertion. The double-arm laminated aluminum alloy terminal generates multiple forces during insertion, including horizontal forces, positive pressure, and a contact force. When the plug terminal 3 is inserted into the receptacle terminal, the deformation transition portion of the laminated terminal 2 undergoes elastic deformation, generating an inward positive pressure. The engagement of the ridge 24 with the groove 25 generates a horizontal friction force. These two forces work together to form a stable contact force, ensuring a reliable and stable electrical connection.

[0047] In a preferred embodiment, a silver plating layer is provided on the convex ridge 24 and the concave ridge 31 to enhance the electrical connection between the socket terminal and the plug terminal 3. The silver plating layer has excellent electrical conductivity, can reduce contact resistance, and improve the reliability of the electrical connection.

[0048] In another preferred embodiment, the convex ridges 24 and concave ridges 31 are provided with a silver-nickel coating to enhance the electrical connection between the receptacle terminal and the plug terminal 3. The silver-nickel coating not only has good electrical conductivity but also high hardness and wear resistance, enabling it to maintain stable electrical performance in environments with frequent plugging and unplugging.

[0049] The lower side of the rear end of the plug terminal 3 is provided with an S-shaped protrusion 33 and an S-shaped groove 32 corresponding to the S-shaped protrusion 33. The S-shaped protrusions 33 are arranged in H rows and W columns, where H ≥ 3 and W ≥ 1. The S-shaped protrusions 33 on the rear end of the plug terminal 3 mate with the S-shaped weld groove 12 on the corresponding aluminum conductor structure 1, and the rear end of the plug terminal 3 is ultrasonically welded to the corresponding aluminum conductor structure 1. This structural design increases the contact area between the plug terminal 3 and the aluminum conductor structure 1, improving the weld strength and electrical connection reliability.

[0050] During the insertion of the plug terminal 3 into the receptacle, the unique structural design generates horizontal forces, positive pressure, and a combined contact force. When the plug terminal 3 is inserted into the receptacle, the lower curved spring 23 first deforms and generates an elastic force. As the insertion depth increases, the deformation of the lower curved spring 23 gradually increases, and the generated elastic force also increases. When the plug terminal 3 is fully inserted, the curved contact surface 34 makes close contact with the lower curved spring 23, and the concave ridge 31 and the convex ridge 24 contact forward of the cross-sectional centerline, forming a stable mechanical and electrical connection.

[0051] In practical applications, the double-arm laminated aluminum alloy terminal provides a simple and reliable plug-in process, a secure connection, and excellent electrical performance. The S-shaped protrusion and groove 25 enhance the connection strength between the terminal and the aluminum conductor structure 1. The lower curved spring 23 and the curved contact surface 34 ensure a smooth transition during plug-in and a reliable connection. The convex ridge 24 and concave ridge 31 enhance the positioning accuracy and mechanical stability of the plug-in connection. The application of silver or silver-nickel plating further improves the conductivity and service life of the electrical connection.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-arm laminated aluminum alloy terminal, characterized by: The invention comprises a socket terminal and a plug terminal (3) matched with the socket terminal, wherein the tail of the socket terminal and the tail of the plug terminal (3) are respectively connected with corresponding aluminum conductor structures (1), and the socket terminal comprises two symmetrically arranged stacked terminals (2), the head of the stacked terminal (2) is plug-fitted with the head of the socket terminal, and the middle of the stacked terminal (2) is provided with a deformation transition portion for increasing the contact stability with the plug terminal (3).

2. The double-arm laminated aluminum alloy terminal according to claim 1, characterized in that: The inner side surfaces of the heads of the two stacked terminals (2) are each provided with at least two ridges (24), and the outer side surfaces of the heads of the two stacked terminals (2) are each provided with grooves (25) corresponding to the ridges (24).

3. The double-arm laminated aluminum alloy terminal according to claim 2, characterized in that: The deformation transition portion comprises at least one lower curved spring (23) and an upper curved spring (22) spaced apart from the lower curved spring (23); before the plug terminal (3) and the socket terminal pair are inserted into position, the lower curved springs (23) of the two stacked terminals (2) are deformed and contact each other; after the plug terminal (3) and the socket terminal pair are inserted into position, the lower curved springs (23) of the two stacked terminals (2) do not contact each other.

4. The double-arm laminated aluminum alloy terminal according to claim 2 or 3, characterized in that: The inner side surfaces of the tails of the two stacked terminals (2) are each provided with a plurality of evenly distributed S-shaped protrusions (26), and the outer side surfaces of the tails of the two stacked terminals (2) are each provided with an S-shaped groove (21) that matches the S-shaped protrusion (26).

5. The double-arm laminated aluminum alloy terminal according to claim 4, characterized in that: The S-shaped protrusions (26) are arranged in N rows and M columns, N≥4, M≥1, and the S-shaped protrusions (26) at the tail of the stacked terminal (2) match the S-shaped welding grooves (11) provided on the corresponding aluminum conductor structure (1).

6. The double-arm laminated aluminum alloy terminal according to claim 2, 3 or 5, characterized in that: The end of the plug terminal (3) is provided with an arc-shaped contact surface (34) that contacts and cooperates with the lower curved spring (23).

7. The double-arm laminated aluminum alloy terminal according to claim 6, characterized in that: The upper and lower sides of the head of the plug terminal (3) are both provided with concave ridges (31) that cooperate with the convex ridges (24). When the plug terminal (3) and the socket terminal are inserted into place, the arc-shaped contact surface (34) contacts the lower spring (23). At this time, the concave ridges (31) and the convex ridges (24) that cooperate with each other are in contact in front of the center line of the cross section.

8. The double-arm laminated aluminum alloy terminal according to claim 7, characterized in that: The convex ridge (24) and the concave ridge (31) are provided with a silver plating layer or a silver-nickel plating layer for increasing the electrical connection between the socket terminal and the plug terminal (3).

9. The double-arm laminated aluminum alloy terminal according to claim 7 or 8, characterized in that: The lower side surface of the tail of the plug terminal (3) is provided with a plurality of evenly distributed S-shaped protrusions (33), and the lower side surface of the tail of the plug terminal (3) is provided with S-shaped grooves (32) corresponding to the S-shaped protrusions (33).

10. The double-arm laminated aluminum alloy terminal according to claim 9, characterized in that: The S-shaped protrusions (33) are arranged in H rows and W columns, with H≥3 and W≥1. The S-shaped protrusions (33) at the tail of the plug terminal (3) match the S-shaped welding grooves (12) on the corresponding aluminum conductor structure (1).

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