Pressed elastic terminal

Abstract

The terminal with pressed elastic piece structure includes a mounting base (1) and an outer elastic piece structure (2) having one end connected to one end of the mounting base (1), the mounting base (1) and the outer elastic piece structure (2) are molded separately, and the outer elastic piece structure (2) is a press-molded structure. The terminal with pressed elastic piece structure is changed from an integrated process to an integrated assembly in which the pressed elastic piece and the mounting base are processed and manufactured separately, which greatly reduces the cost of the terminal, reduces the number of processing steps, and ensures sufficient contact between the elastic piece and the conductive part of the target terminal, and meets the mechanical requirements and temperature rise requirements of the charging system.

Description

[Technical Field]

[0001] Related Applications This application claims priority from a Chinese patent application bearing application number 202110803160.X, filed on July 15, 2021, and a Chinese utility model application bearing application number 202121611169.2, filed on July 15, 2021, and incorporates the contents disclosed in the above applications by reference as part of this application.

[0002] The present application relates to a terminal with a pressed elastic piece structure. [Background technology]

[0003] Electric vehicle cables have high voltages and currents, so they require large-diameter conductors to conduct the current. Current charging guns and charging base terminals are both made of copper and processed as a single unit. The drawbacks are high costs, lengthy processing time, and the only option in the event of a breakdown is to replace the entire unit, which is detrimental to reducing the cost of the charging system. Summary of the Invention

[0004] In order to reduce the manufacturing costs of charging terminals, the present application changes from one-piece processing to processing and manufacturing the pressed elastic piece and mounting base separately and then assembling them together, thereby significantly reducing the cost of the terminal, reducing the number of processing steps, and ensuring sufficient contact between the elastic piece and the conductive part of the target terminal, and providing a terminal with a pressed elastic piece structure that meets the mechanical and temperature rise requirements of the charging system.

[0005] As a technical solution adopted in this application to solve the technical problem, The terminal with a press-molded elastic piece structure includes a mounting base and an outer elastic piece structure having one end connected to one end of the mounting base, the mounting base and the outer elastic piece structure being molded separately, and the outer elastic piece structure being a press-molded structure.

[0006] The beneficial effects of the present invention are as follows:

[0007] 1. The pressed elastic piece (which may include an outer elastic piece structure and an inner elastic piece structure) and the mounting base are separately processed and then assembled into a single piece, eliminating the need to machine the charging terminal as a single piece, which not only saves processing time but also saves materials.

[0008] 2. The pressed elastic piece is processed by the pressing method, which is simple in processing method and requires few man-hours, and can maintain the conductive and elastic properties of the material.

[0009] 3. When the pressed elastic piece of the terminal is damaged, only the pressed elastic piece needs to be replaced, rather than replacing the entire terminal, thereby saving terminal and maintenance costs.

[0010] The drawings described herein are provided to provide a further understanding of the present application, constitute a part of the present application, and are not intended to be limiting of the present application. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective schematic view of a terminal with a pressed elastic piece structure according to a first embodiment of the present invention; [Figure 2] 1 is a front view of a terminal with a pressed elastic piece structure according to a first embodiment of the present invention; [Figure 3] Schematic diagram showing the first type of connection between the outer elastic piece structure and the mounting base in the first embodiment. [Figure 4] Schematic diagram showing the second type of connection between the outer elastic piece structure and the mounting base in the first embodiment. [Figure 5] Schematic diagram showing a third type of connection between the outer elastic piece structure and the mounting base in the first embodiment. [Figure 6] Schematic planar development diagram of the first type outer elastic piece structure in Example 1 [Figure 7] FIG. 1 is a front view of the outer elastic strip of the second type of outer elastic structure in Example 1. [Figure 8] 1 is a perspective schematic diagram of the outer elastic strip of the second type of outer elastic structure in Example 1; [Figure 9] Planar development schematic diagram of the second type outer elastic piece structure in Example 1 [Figure 10] 1 is a perspective schematic view of a terminal with a pressed elastic piece structure according to a second embodiment of the present invention; [Figure 11] Schematic cross-sectional view of a terminal with a pressed elastic piece structure according to a second embodiment of the present invention. [Figure 12] Schematic cross-sectional view of the inner elastic piece structure in Example 2 [Figure 13] Schematic planar development diagram of the first type of inner elastic piece structure in Example 2 [Figure 14] Schematic diagram of the second type of inner elastic piece structure in the second embodiment DETAILED DESCRIPTION OF THE INVENTION

[0012] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in more detail below with reference to the drawings. Hereinafter, the exemplary embodiments of the present application and the description thereof are for the purpose of interpreting the present application, but are not intended to limit the present application.

[0013] Example 1 As shown in Figures 1 to 3, an embodiment of the present application provides a terminal with a press-molded elastic piece structure, which includes a mounting base 1 and an outer elastic piece structure 2 having one end connected to one end of the mounting base 1, and the mounting base 1 and the outer elastic piece structure 2 are molded separately, and the outer elastic piece structure 2 is a press-molded structure.

[0014] Here, by separately processing and molding the mounting base 1 and the outer elastic piece structure 2, and then assembling them together to finally form a terminal with the pressed elastic piece structure, it is possible to significantly reduce the cost of the terminal, reduce the processing man-hours, and ensure sufficient contact between the elastic piece and the conductive part of the target terminal.

[0015] In this embodiment, the outer elastic piece structure 2 is cylindrical and includes a plurality of (e.g., two) outer elastic piece segments 21 along the circumferential direction of the outer elastic piece structure 2. The planar development structure of the outer elastic piece segments 21 is approximately fan-shaped, and the cross section of the outer elastic piece segment 21 is arc-shaped. The thickness of the outer elastic piece structure 2 is 0.035 mm to 4.712 mm. If the thickness is less than 0.035 mm, the elasticity of the outer elastic piece structure 2 will be insufficient. If the thickness is more than 4.712 mm, it will be difficult to deform and will be more difficult to process, making it meaningless to actually produce.

[0016] The inventor selected 11 sets of terminals with pressed elastic piece structures, and conducted elastic force tests on the outer elastic piece strips 212 for each terminal, and each set included 7 terminals.

[0017] The elastic force test method uses a precision force gauge to measure the elastic force of a single outer elastic strip 212 or 22 at the insertion opening position by moving it 1 mm. In this embodiment, depending on the number and thickness of the outer elastic strips 212 or 22, an outer elastic strip 212 or 22 with an elastic force of less than 3 N or greater than 10 N is deemed unacceptable. This is because a small elastic force reduces the stress caused by the contact between the outer elastic strip structure 2 and its corresponding terminal, resulting in a smaller contact area and higher contact resistance. A large elastic force increases the insertion force of the outer elastic strip structure 2 into its corresponding terminal, making it relatively difficult to insert or remove the terminal.

[0018] Table 1: Effect of thickness and number of outer elastic strips 212 on elastic force

[0019] [Table 1]

[0020] As can be seen from Table 1 above, by setting the thickness and number of the outer elastic piece structures 2, it is possible to obtain a terminal with a pressed elastic piece structure that meets the required elastic force, but when the thickness of the outer elastic piece structure 2 is less than 0.035 mm, the elastic force of all the outer elastic piece strips 212 fails regardless of the number of outer elastic piece structures 2. Similarly, when the thickness of the outer elastic piece structure 2 is greater than 4.712 mm, the elastic force of all the outer elastic piece strips 212 fails regardless of the number of outer elastic piece structures 2. Therefore, the inventors selected outer elastic piece structures 2 with thicknesses of 0.035 mm to 4.712 mm.

[0021] 6, in this embodiment, each outer elastic piece segment 21 includes an outer connection portion 211 and a plurality of outer elastic piece strips 212 along the axial direction of the outer elastic piece structure 2, with an outer spacing slit 213 formed between two adjacent outer elastic piece strips 212. The outer elastic piece strips 212 can adapt to the processing errors of the target terminals, and can increase the bonding force between the outer elastic piece strips 212 and the target terminals, ensuring a larger contact area and achieving better electrical and mechanical performance, resolving the problem that conventional terminals cannot meet the mechanical and temperature rise requirements.

[0022] In this embodiment, as shown in Figures 7 and 8, the outer elastic piece structure 2 is tubular and includes a plurality of independent outer elastic strips 22 along the circumferential direction of the outer elastic piece structure 2. Such independent outer elastic strips can be directly processed using a press or roll press, saving material and allowing processing with a small width of raw material. If the outer elastic piece structure 2 is damaged during use, it is not necessary to replace the entire terminal, but only the damaged outer elastic piece structure 2, reducing terminal waste, improving maintenance efficiency, and significantly saving costs.

[0023] In another embodiment, as shown in FIG. 9 , multiple outer elastic strips 22 are connected via an outer annular base strip 23 located at one end of the outer elastic piece structure 2 and are stacked on the outer annular base strip 23. When wound, the outer annular base strip 23 forms a ring shape; that is, when wound, the outer elastic piece structure 2 in FIG. 9 forms a cylindrical shape. While independent outer elastic strips 22 have the advantages of saving material and allowing partial replacement if damaged, when there are a large number of independent outer elastic strips 22, the process of fixing each of the independent outer elastic strips 22 to the base 1 becomes complicated and time-consuming, limiting the use of the independent outer elastic strips 22. By using the outer annular base strip 23, the outer elastic strips 22 and the outer annular base strip 23 can be first stacked and fixed, and then the stacked and fixed outer elastic strips 22 and the outer annular base strip 23 can be wound into a cylindrical shape and fixed to the base 1, significantly reducing the installation time of the independent outer elastic strips 22 and improving the efficiency of assembly work.

[0024] In this embodiment, as shown in Fig. 4, the outer elastic piece structure 2 is cylindrical and includes an internal cavity, which is tapered, i.e., the inner diameter of one end of the outer elastic piece structure 2 is larger than the inner diameter of the other end of the outer elastic piece structure 2. If the inner diameter of the internal cavity of the outer elastic piece structure 2 were exactly the same as the outer diameter of the target terminal, the target terminal would not be able to be inserted into the internal cavity due to tolerance fitting, or there would be areas where the target terminal and the outer elastic piece structure 2 are barely in contact, resulting in electrical conductivity not being achieved or a small contact area. Therefore, the inventors have arranged the internal cavity of the outer elastic piece structure 2 to be tapered, which allows the target terminal to be inserted into the internal cavity while allowing the outer elastic piece structure 2 to have a larger deformation space, resulting in a greater gripping force after the outer elastic piece structure 2 and the target terminal are joined.

[0025] In this embodiment, an outer arc-shaped reduced diameter portion 24 can be provided on the inner surface of the outer elastic piece structure 2 along the direction from one end of the outer elastic piece structure 2 to the other end of the outer elastic piece structure 2. The inner diameter of the outer arc-shaped reduced diameter portion 24 is smaller than the inner diameter of the outer elastic piece structure 2, so that the inner surface of the outer arc-shaped reduced diameter portion 24 can always be in contact with the outer surface of the target terminal, and at the same time, after joining, the angle between the inner surface of the outer arc-shaped reduced diameter portion 24 and the terminal axis becomes the same as the angle between the outer surface of the target terminal and the terminal axis, allowing the inner surface of the outer arc-shaped reduced diameter portion 24 to be in surface contact with the outer surface of the target terminal, increasing the contact area between the outer elastic piece structure 2 and the target terminal, reducing contact resistance, improving the conductivity of the terminal with the pressed elastic piece structure, and improving the safety and stability of the power receiving device.

[0026] 3 and 5, to facilitate the insertion of the target terminal, an outer arc-shaped expanded diameter portion 25 may be further provided on the inner surface of the outer elastic piece structure 2, that is, an outer arc-shaped reduced diameter portion 24 and an outer arc-shaped expanded diameter portion 25 are provided in that order on the inner surface of the outer elastic piece structure 2 along the direction from one end of the outer elastic piece structure 2 to the other end of the outer elastic piece structure 2. The internal cavity of the outer elastic piece structure 2 is generally a tapered hole, and the opening diameter of the internal cavity is smaller than the diameter of the target terminal. Therefore, an outer arc-shaped expanded diameter portion 25 is provided inside the opening side of the internal cavity to guide the insertion of the target terminal, guiding the target terminal to be inserted smoothly and expanding the outer elastic piece structure 2, allowing the target terminal to be inserted into the internal cavity of the outer elastic piece structure 2.

[0027] As shown in Fig. 4, the outer arc-shaped reduced diameter portion 24 and the outer arc-shaped expanded diameter portion 25 have a generally tapered structure, and the taper of the outer arc-shaped reduced diameter portion 24 may be the same as the taper of the outer arc-shaped expanded diameter portion 25. Alternatively, as shown in Fig. 3, the taper of the outer arc-shaped reduced diameter portion 24 is smaller than the taper of the outer arc-shaped expanded diameter portion 25, the outer arc-shaped expanded diameter portion 25 is located at the other end of the outer elastic piece structure 2, and the outer arc-shaped expanded diameter portion 25 has a flanging structure.

[0028] In this embodiment, a mounting groove is provided at one end of the mounting base, and the mounting groove is located at the outer, inner or central portion of the one end of the mounting base, and the outer elastic piece structure is mated with the mounting groove.

[0029] In this embodiment, the connection between the outer elastic piece structure 2 and the mounting base 1 can be detachable or non-detachable. Specifically, the connection between the outer elastic piece structure 2 and the mounting base 1 can be one or more of crimping, screw-in connection, thread connection, pin connection, snap connection, adhesive bonding, welding and caulking.

[0030] When the outer elastic piece structure 2 and the mounting base 1 are connected by crimping, one end of the mounting base 1 is provided with a mounting groove 11, which is located on the outer side (as shown in FIG. 5), inner side or middle part (as shown in FIG. 3) of one end of the mounting base 1, and the outer elastic piece structure 2 is joined in line with the mounting groove 11. When the outer elastic piece structure 2 and the mounting base 1 are connected by adhesive or welding, as shown in FIG. 4, the one end of the mounting base 1 does not need to be provided with a mounting groove 11.

[0031] In specific implementation, the outer elastic piece structure 2 and the mounting base 1 can be connected by crimping or welding. When the radial structure of the outer connection part 211 of the outer elastic piece structure 2 is a ring structure, the portion where the outer connection part 211 and the mounting base 1 are connected to each other, or the portion where the multiple independent outer elastic strips 22 included in the outer elastic piece structure 2 are inserted into the mounting grooves on the mounting base 1 can be connected by tin-plating crimping or welding to achieve a non-detachable connection.

[0032] In specific implementation, a threaded connection can be adopted between the outer elastic piece structure 2 and the mounting base 1. When the radial structure of the outer connection part 211 of the outer elastic piece structure 2 is a ring structure, a female thread sleeve is provided on the inner wall of the outer connection part 211 and a male thread is provided on the outer wall on the mounting base 1 side, in this case the mounting base 1 is a tubular hollow structure or a solid columnar structure. Alternatively, when the radial structure of the outer connection part 211 of the outer elastic piece structure 2 is a ring structure, a male thread is provided on the outer wall of the outer connection part 21 and a female thread is provided on the inner wall on the mounting base 1 side, in this case the mounting base 1 is a tubular hollow structure, and the female thread / male thread on the outer elastic piece structure 2 side are screwed into the male thread / female thread on the mounting base 1 side, respectively, to achieve a detachable connection.

[0033] In a specific implementation, the outer elastic plate structure 2 and the mounting base 1 can be connected by threads, with the screw having a screw head and a bolt, the bolt end being a free end, and if the radial structure of the outer connection part 211 of the outer elastic plate structure 2 is a ring structure, the portion where the outer connection part 21 and the mounting base 1 are connected to each other can be provided with a threaded hole for the bolt, and after the bolt drills the threaded hole, a nut can be connected to the bolt from the free end side of the bolt, thereby fixing the portion where the outer elastic plate structure 2 and the mounting base 1 are connected to each other between the screw head and the nut, thereby realizing a removable connection. In a specific implementation, the outer elastic plate structure 2 and the mounting base 1 can be connected by threads, with multiple screws drilled from the free end side of the bolt into the multiple independent outer elastic strips 22 included in the outer elastic plate structure 2 and the insertion portions of the mounting grooves in the mounting base 1, in which case the screws are connected to the outer elastic strips 22 and the mounting base 1 by interference fitting, thereby realizing a non-detachable connection.

[0034] In specific implementation, a pin connection can be adopted between the outer elastic piece structure 2 and the mounting base 1, with the pin passing through the multiple independent outer elastic strips 22 included in the outer elastic piece structure 2 and the insertion portion of the mounting groove in the mounting base 1, with one end of the pin located inside the mounting base 1 connected by interference fitting, and one end of the pin located outside the mounting base 1 connected by crimping, thereby realizing a non-detachable connection.

[0035] In specific implementation, a pin connection can be adopted between the outer elastic piece structure 2 and the mounting base 1, and the pin passes through the portion where the outer elastic piece structure 2 and the mounting base 1 are connected to each other with a spigot, and the pin ends exposed at both ends of the pin from the portion where the outer elastic piece structure 2 and the mounting base 1 are connected to each other with a spigot can be crimped to achieve an irremovable connection.

[0036] In specific implementation, a conductive adhesive can be used to achieve an adhesive connection between the outer elastic piece structure 2 and the mounting base 1, or a conductive adhesive can be used to achieve an adhesive connection between the multiple independent outer elastic strips 22 included in the outer elastic piece structure 2 and the insertion locations of the mounting grooves on the mounting base 1, in which case a non-detachable connection can be achieved between the outer elastic piece structure 2 and the mounting base 1 and normal electrical conductivity of the terminals can be ensured.

[0037] In concrete implementation, a crimping connection can be adopted between the outer elastic piece structure 2 and the mounting base 1, with a rivet passing through the portion where the outer elastic piece structure 2 and the mounting base 1 are joined together, and both ends of the rivet crimping the pin ends exposed from the portion where the outer elastic piece structure 2 and the mounting base 1 are joined together, thereby achieving an irremovable connection.

[0038] In specific implementation, a crimping connection can be adopted between the outer elastic piece structure 2 and the mounting base 1, with rivets penetrating the multiple independent outer elastic strips 22 included in the outer elastic piece structure 2 and the insertion portion of the mounting groove in the mounting base 1. In this case, if the mounting base 1 is a tubular hollow structure, the rivets can penetrate the multiple independent outer elastic strips 22 included in the outer elastic piece structure 2 and the insertion portion of the mounting groove in the mounting base 1, and the ends of the rivets exposed at both ends can be crimped to achieve an undetachable connection.

[0039] The above various connection forms may be used alone or in combination of multiple types. For example, when a screw connection is used, a conductive adhesive may be used at the same time to connect the outer elastic piece structure 2 and the mounting base 1, which can achieve a more stable connection between the outer elastic piece structure 2 and the mounting base 1.

[0040] In this embodiment, the mounting base 1 includes a power transmission part 12 and an elastic piece external connection part 13 connected in sequence, and the power transmission part 12 serves to connect to the conductor, and the power transmission part 12 has a flat structure (or a U-shaped structure, a major arc structure, a cylindrical structure, a columnar structure, a bowl-shaped structure, or a polygonal structure).

[0041] In some embodiments, the power transmission unit 12 must be electrically connected to the conductor, typically by crimping or welding. Therefore, the power transmission unit 12 can be designed in various structures. Depending on the electrical connection requirements and the installation environment of the power receiving device, different power transmission unit 12 structures can be selected to establish a stable electrical connection with the conductor. Generally, U-shaped, arc-shaped, cylindrical, or polygonal structures are suitable for crimping and welding, while flat or bowl-shaped structures are suitable for welding.

[0042] One of the roles of the elastic piece outer connecting part 13 is to attach and connect the outer elastic piece structure 2, and also to be attached to the power receiving device. According to the implementation requirements, a plurality of annular grooves are provided on the outside of the elastic piece outer connecting part 13.

[0043] The manufacturing process of the terminal with the pressed elastic piece structure will be described below.

[0044] 1. The mounting base 1 is formed by turning, and the outer elastic piece structure 2 is press-formed.

[0045] 2. As shown in FIG. 5, the mounting base 1 and the outer elastic piece structure 2 are crimped together to assemble them into one unit.

[0046] Example 2 As shown in Figures 10 and 11, this embodiment is an improvement over Example 1, and the main difference between this embodiment and Example 1 is that in addition to Example 1, this embodiment adds an inner elastic piece structure 3, that is, the terminal with pressed elastic piece structure further includes an inner elastic piece structure 3, and the inner elastic piece structure 3 and the outer elastic piece structure 2 are stacked, and one end of the inner elastic piece structure 3 is connected to the mounting base 1, or one end of the inner elastic piece structure 3 is connected to the outer elastic piece structure 2, or one end of the inner elastic piece structure 3 is connected to the mounting base 1 and the outer elastic piece structure 2.

[0047] Because the outer elastic plate structure 2 is generally press-formed and is limited by the thickness of the plate material, the thickness of the outer elastic plate structure 2 cannot necessarily meet the grip strength requirements between the pressed elastic plate structure-equipped terminal and the corresponding terminal. Therefore, to reinforce the mechanical performance of the terminal insertion structure, it is necessary to provide an inner elastic plate structure 3 inside the outer elastic plate structure 2. Furthermore, the inner elastic plate structure 3, together with the outer elastic plate structure 2, is electrically connected to the corresponding terminal, increasing the contact area between the pressed elastic plate structure-equipped terminal and the corresponding terminal. This reduces the contact resistance of the terminal insertion structure, improves current conduction, and better controls temperature rise, significantly improving the electrical performance of the terminal insertion structure.

[0048] In this embodiment, the inner elastic piece structure 3 is mounted inside the outer elastic piece structure 2, thereby increasing the contact area between the pressed elastic piece structure terminal and the target terminal while preventing the volume of the pressed elastic piece structure terminal from increasing. The mounting base 1, outer elastic piece structure 2, and inner elastic piece structure 3 are all molded separately, with the inner elastic piece structure 3 being a press-formed structure. Similarly, the inner elastic piece structure 3 can also be press-formed using a plate material, significantly reducing the amount of material used for the terminal. In addition, in some embodiments, the structure of the pressed elastic piece structure terminal is complex, and the integrated processing method is costly and requires a long processing time. Therefore, the pressed elastic piece structure terminal can be processed in several sections, and then the inner elastic piece structure 3 and the outer elastic piece structure 2 can be assembled with the mounting base 1, respectively, thereby improving work efficiency and reducing material waste.

[0049] In this embodiment, both the inner elastic piece structure 3 and the outer elastic piece structure 2 are tubular, and the length of the outer elastic piece structure 2 is greater than the length of the inner elastic piece structure 3. Both the inner elastic piece structure 3 and the outer elastic piece structure 2 need to be electrically connected to the target terminal, and since the inner elastic piece structure 3 and the outer elastic piece structure 2 are stacked, the length of the outer elastic piece structure 2 needs to be greater than the length of the inner elastic piece structure 3 so that the target terminal can contact the inner elastic piece structure 3 and the outer elastic piece structure 2 simultaneously.

[0050] In this embodiment, the axis of the outer elastic piece structure 2 overlaps with the axis of the inner elastic piece structure 3. Because the outer elastic piece structure 2 and the inner elastic piece structure 3 are inserted into and connected to the same target terminal, the male end of the target terminal is simultaneously inserted into the internal cavities of the outer elastic piece structure 2 and the inner elastic piece structure 3. Therefore, the axis of the outer elastic piece structure 2 must overlap with the axis of the inner elastic piece structure 3, and also with the axis of the target terminal after insertion. The internal cavities of the outer elastic piece structure 2 and the inner elastic piece structure 3 are both tapered. If the internal diameter of the internal cavity of the inner elastic piece structure 3 were exactly the same as the external diameter of the target terminal, then due to tolerance fitting, the target terminal would not be able to be inserted into the internal cavity of the inner elastic piece structure 3, or there would be areas where the target terminal and the elastic piece structure 3 barely contact each other, resulting in situations such as electrical continuity not being achieved or a small contact area. Therefore, by arranging the internal cavities of the outer elastic piece structure 2 and the inner elastic piece structure 3 in a tapered shape, the target terminal can be inserted into the internal cavity, and at the same time, the outer elastic piece structure 2 and the inner elastic piece structure 3 have a larger deformation space, so that a larger gripping force can be obtained after joining the outer elastic piece structure 2 and the inner elastic piece structure 3 to the target terminal.

[0051] In this embodiment, the taper of the internal cavity of the outer elastic piece structure 2 is smaller than the taper of the internal cavity of the inner elastic piece structure 3, and since the outer elastic piece structure 2 is located on the outer periphery of the inner elastic piece structure 3, the taper of the internal cavity of the outer elastic piece structure 2 is smaller than the taper of the internal cavity of the inner elastic piece structure 3, so that the tips of both the outer elastic piece structure 2 and the inner elastic piece structure 3 can contact the target side terminal, thereby achieving electrical conductivity.

[0052] In this embodiment, the structure of the outer elastic piece structure 2 is completely the same as, partially the same as, or completely different from the structure of the inner elastic piece structure 3, and multiple structural forms in Example 1 can be selected for the outer elastic piece structure 2, and multiple structural forms included in Example 1 can also be referred to for the inner elastic piece structure 3, and the combination of the outer elastic piece structure 2 and the inner elastic piece structure 3 can be selected as needed.

[0053] In this embodiment, the inner elastic piece structure 3 is cylindrical, and includes a plurality of inner elastic piece segments 31 having arc-shaped cross sections along the circumferential direction of the inner elastic piece structure 3, and the thickness of the inner elastic piece structure 3 is 0.2 mm to 5 mm.

[0054] The inventor selected 11 sets of terminals with pressed elastic piece structures, and conducted elastic force tests on the inner elastic piece strips 312 for each terminal, and each set included 7 terminals.

[0055] The elastic force test method uses a precision force gauge to measure the elastic force of a single inner elastic strip 312 or 32 when it moves 1 mm at the insertion opening. In this embodiment, depending on the number and thickness of the inner elastic strips 312 or 32, an inner elastic strip 312 or 32 with an elastic force of less than 3 N or greater than 10 N is rejected. This is because a small elastic force reduces the contact stress between the inner elastic strip structure 3 and its corresponding terminal, resulting in a small contact area and high contact resistance. A large elastic force increases the insertion force of the inner elastic spring structure 3 into its corresponding terminal, making it relatively difficult to insert or remove the terminal.

[0056] Table 2: Effect of thickness of inner elastic strip structure 3 on elasticity of inner elastic strip 312

[0057] [Table 2]

[0058] As can be seen from Table 2 above, by setting the thickness and number of the internal elastic piece structures 3, it is possible to obtain a terminal with a pressed elastic piece structure that meets the required elastic force, but when the thickness of the internal elastic piece structure 3 is less than 0.2 mm, the elastic force of all the internal elastic piece strips 312 fails regardless of the number of internal elastic piece structures 3. Similarly, when the thickness of the internal elastic piece structure 3 is greater than 5 mm, the elastic force of all the internal elastic piece strips 312 fails regardless of the number of internal elastic piece structures 3. Therefore, the inventors selected internal elastic piece structures 3 with a thickness of 0.2 mm to 5 mm.

[0059] As shown in Figure 13, the inner elastic piece segment 31 includes an inner connection portion 311 and a plurality of inner elastic piece strips 312 along the axial direction of the inner elastic piece structure 3, with an inner spacing slit 313 formed between two adjacent inner elastic piece strips 312. The inner elastic piece strips 312 can adapt to the processing errors of the target terminal, increase the bonding force between the inner elastic piece strips 312 and the target terminal, ensure a larger contact area, achieve better electrical and mechanical performance, and solve the problem of conventional terminals being unable to meet the mechanical and temperature rise requirements.

[0060] Alternatively, the inner elastic piece structure 3 may be tubular, and include a plurality of independent inner elastic strips 32 along the circumferential direction of the inner elastic piece structure 3. Such independent inner elastic strips can be directly processed using a press or roll press, saving material and allowing processing with a small width of material. If the inner elastic piece structure 3 is damaged during use, it is not necessary to replace the entire terminal, but only the damaged inner elastic piece structure 3, reducing terminal waste, improving maintenance efficiency, and significantly saving costs.

[0061] As shown in Figure 14, the multiple inner elastic strips 32 are connected via an inner annular base strip 33, and the inner elastic strips 32 are stacked on the inner annular base strip 33 located at one end of the inner elastic piece structure 3. Independent inner elastic strips 32 have the advantages of saving materials and allowing partial replacement when damaged. However, if there are a large number of independent inner elastic strips 32, the process of fixing each of the independent inner elastic strips 32 to the base 1 becomes complicated and time-consuming, which actually limits the use of independent inner elastic strips 32. By providing the inner annular base strip 33, the inner elastic strips 32 and the inner annular base strip 33 can be first stacked and fixed, and then the stacked and fixed inner elastic strips 32 and the inner annular base strip 33 can be rolled into a cylindrical shape and fixed to the base 1, which significantly reduces the installation time of the independent inner elastic strips 32 and improves assembly efficiency.

[0062] The inner resilient piece structure 3 is cylindrical, and the inner cavity of the inner resilient piece structure 3 is tapered, with the inner diameter of one end of the inner resilient piece structure 3 being larger than the inner diameter of the other end of the inner resilient piece structure 3. If the inner diameter of the inner cavity of the inner resilient piece structure 3 were exactly the same as the outer diameter of the target terminal, the target terminal would not be able to be inserted into the inner cavity due to tolerance fitting, or there would be an area where the target terminal and the inner resilient piece structure 3 are barely in contact, resulting in situations such as not being able to achieve electrical conductivity or a small contact area. Therefore, by tapering the inner cavity of the inner resilient piece structure 3, the target terminal can be inserted into the inner cavity, and at the same time, the inner resilient piece structure 3 has a larger deformation space, resulting in a greater gripping force after the inner resilient piece structure 3 and the target terminal are joined.

[0063] In this embodiment, an inner arc-shaped reduced diameter portion 34 is provided on the inner surface of the inner resilient piece structure 3 along the direction from one end of the inner resilient piece structure 3 to the other end of the inner resilient piece structure 3. Because the inner diameter of the inner arc-shaped reduced diameter portion 34 is smaller than the inner diameter of the inner resilient piece structure 3, the inner surface of the inner arc-shaped reduced diameter portion 34 can be kept in contact with the outer surface of the target terminal. At the same time, after joining, the angle between the inner surface of the inner arc-shaped reduced diameter portion 34 and the terminal axis is the same as the angle between the outer surface of the target terminal and the terminal axis, allowing the inner surface of the inner arc-shaped reduced diameter portion 34 to be in surface contact with the outer surface of the target terminal. This increases the contact area between the inner resilient piece structure 3 and the target terminal, reduces contact resistance, improves the conductivity of the terminal with the pressed resilient piece structure, and improves the safety and stability of the power receiving device.

[0064] 12 , an inner arc-shaped reduced diameter portion 34 and an inner arc-shaped expanded diameter portion 35 are provided in this order on the inner surface of the inner elastic piece structure 3 along the direction from one end of the inner elastic piece structure 3 to the other end of the inner elastic piece structure 3. The inner cavity of the inner elastic piece structure 3 is generally a tapered hole, and the opening diameter of the inner cavity is smaller than the diameter of the target terminal. Therefore, it is necessary to provide an inner arc-shaped expanded diameter portion 35 inside the opening side of the inner cavity to guide the insertion of the target terminal, which can guide the smooth insertion of the target terminal and allows the inner elastic piece structure 3 to expand so that the target terminal can be inserted into the inner cavity along the inner elastic piece structure 3.

[0065] In this embodiment, a mounting groove 11 is provided at one end of the mounting base 1, and the mounting groove 11 is located on the outer, inner or central part of the one end of the mounting base 1, and the outer elastic plate structure 2 is inserted into the mounting groove 11. The inner elastic plate structure 3 and the outer elastic plate structure 2 can be inserted into the same or different mounting grooves 11.

[0066] In this embodiment, one end of the inner elastic piece structure 3 is connected to one end of the mounting base 1 or one end of the outer elastic piece structure 2, and the connection form can be one or more of crimping, screw connection, thread connection, insertion connection, pin connection, snap connection, adhesive bonding, welding and crimping.

[0067] Other technical features of this embodiment may be the same as those of the first embodiment, and due to space limitations, this embodiment will not be described in detail.

[0068] The above is merely an example of the present application and is not intended to limit the present application. Those skilled in the art will appreciate that the present application can undergo various modifications and variations. Any amendments, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A terminal with a press elastic piece structure, The device includes a mounting base (1) and an outer elastic piece structure (2) having one end connected to one end of the mounting base (1), the mounting base (1) and the outer elastic piece structure (2) being molded separately, and the outer elastic piece structure (2) being a press-molded structure; The elastic sheet further includes an inner elastic sheet structure (3), the inner elastic sheet structure (3) is stacked with the outer elastic sheet structure (2), and one end of the inner elastic sheet structure (3) is connected to the mounting base (1) and / or the outer elastic sheet structure (2); The outer elastic piece structure (2) and the inner elastic piece structure (3) are both tubular, the inner elastic piece structure (3) is fitted inside the outer elastic piece structure (2), the length of the outer elastic piece structure (2) is greater than the length of the inner elastic piece structure (3), and the outer elastic piece structure (2) protrudes outward in the axial direction of the terminal with the pressed elastic piece structure beyond the inner elastic piece structure (3); The outer elastic piece structure (2) includes a plurality of outer elastic piece segments (21) having an arc-shaped cross section along the circumferential direction of the outer elastic piece structure (2), and the thickness of the outer elastic piece structure (2) is 0.035 mm to 4.712 mm; The outer elastic piece structure (2) includes a plurality of independent outer elastic strips (22) along the circumferential direction of the outer elastic piece structure (2), The outer elastic strips (22) are connected by an outer annular base strip (23), and the outer elastic strips (22) are stacked on the outer annular base strip (23), and the outer annular base strip (23) is provided at one end of the outer elastic piece structure (2). Terminal with press elastic piece structure.

2. The internal cavity of the outer elastic piece structure (2) is tapered, and the inner diameter of one end of the outer elastic piece structure (2) is larger than the inner diameter of the other end of the outer elastic piece structure (2). The terminal with the pressed elastic piece structure according to claim 1.

3. An outer arc-shaped reduced diameter portion (24) is provided on the inner surface of the outer elastic piece structure (2) along the direction from one end of the outer elastic piece structure (2) to the other end of the outer elastic piece structure (2). The terminal with the pressed elastic piece structure according to claim 1.

4. An outer arc-shaped reduced diameter portion (24) and an outer arc-shaped expanded diameter portion (25) are provided in this order on the inner surface of the outer elastic piece structure (2) along the direction from one end of the outer elastic piece structure (2) to the other end of the outer elastic piece structure (2). The terminal with the pressed elastic piece structure according to claim 1.

5. A mounting groove (11) is provided at one end of the mounting base (1), and the mounting groove (11) is located on the outer side, inner side, or central part of one end of the mounting base (1), and the outer elastic piece structure (2) is joined to the mounting groove (11). The terminal with the pressed elastic piece structure according to claim 1.

6. The connection between the outer elastic piece structure (2) and the mounting base (1) is made by one or more of crimping, screwing, threading, insertion, pinning, snapping, bonding, welding, and caulking. The terminal with the pressed elastic piece structure according to claim 1.

7. The mounting base (1), the outer elastic piece structure (2), and the inner elastic piece structure (3) are all molded separately, and the inner elastic piece structure (3) is a press-molded structure. The terminal with the pressed elastic piece structure according to claim 1.

8. The axis of the outer elastic piece structure (2) overlaps with the axis of the inner elastic piece structure (3), and the inner cavities of the outer elastic piece structure (2) and the inner elastic piece structure (3) are both tapered. The terminal with the pressed elastic piece structure according to claim 1.

9. The taper of the internal cavity of the outer elastic piece structure (2) is smaller than the taper of the internal cavity of the inner elastic piece structure (3). The terminal with the pressed elastic piece structure according to claim 8.

10. The inner elastic piece structure (3) includes a plurality of inner elastic piece segments (31) having an arc-shaped cross section along the circumferential direction of the inner elastic piece structure (3), and the thickness of the inner elastic piece structure (3) is 0.2 mm to 5 mm. The terminal with the pressed elastic piece structure according to claim 1.

11. The inner elastic piece segment (31) includes an inner connection portion (311) and a plurality of inner elastic piece strips (312) along the axial direction of the inner elastic piece structure (3), and an inner spacing slit (313) is formed between two adjacent inner elastic piece strips (312). The terminal with the pressed elastic piece structure according to claim 10.

12. The inner elastic piece structure (3) includes a plurality of independent inner elastic strips (32) along the circumferential direction of the inner elastic piece structure (3). The terminal with the pressed elastic piece structure according to claim 1.

13. The plurality of inner elastic strips (32) are connected by an inner annular base strip (33), and the inner elastic strips (32) are stacked with the inner annular base strip (33), and the inner annular base strip (33) is located at one end of the inner elastic piece structure (3). The terminal with the pressed elastic piece structure according to claim 12.

14. The internal cavity of the internal elastic piece structure (3) is tapered, and the internal diameter of one end of the internal elastic piece structure (3) is larger than the internal diameter of the other end of the internal elastic piece structure (3); The terminal with the pressed elastic piece structure according to claim 1.

15. An inner arc-shaped reduced diameter portion (34) is provided on the inner surface of the inner elastic piece structure (3) along the direction from one end of the inner elastic piece structure (3) to the other end of the inner elastic piece structure (3). The terminal with the pressed elastic piece structure according to claim 1.

16. An inner arc-shaped reduced diameter portion (34) and an inner arc-shaped expanded diameter portion (35) are provided in this order on the inner surface of the inner elastic piece structure (3) along the direction from one end of the inner elastic piece structure (3) to the other end of the inner elastic piece structure (3). The terminal with the pressed elastic piece structure according to claim 1.

17. The connection between one end of the inner elastic piece structure (3) and one end of the mounting base (1) is made by one or more of crimping, screwing, threading, insertion, pinning, snapping, bonding, welding, and caulking. The terminal with the pressed elastic piece structure according to claim 1.

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