Barrel terminal, fitting connection structure and processing method thereof

Abstract

The barrel terminal includes a contact portion (10), a fixed portion (20), and a connection portion (30), the fixed portion (20) including an extension portion (201) and a mounting portion (202) injection molded on the extension portion (201). The contact portion (10), the extension portion (201), and the connection portion (30) are integrally molded into a cylindrical tube. The contact portion (10) is provided with at least two axial slots to divide a side wall of the extension portion (10) into at least two elastic contact pieces (103). The contact portion (10) is recessed radially inward such that the elastic contact pieces (103) form an arc-shaped structure. The mating connection structure includes a mating terminal and a barrel terminal. A processing method for the barrel terminal is also disclosed.

Description

[Technical Field]

[0001] (Related Applications) This application claims priority to a Chinese patent application with application number 202110803204.9 filed on July 15, 2021, and a Chinese utility model application with application number 202121613435.5 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 the field of electrical connections, and more particularly to barrel terminals, mating connection structures and methods for fabricating the same. [Background technology]

[0003] In the field of electrical connections, there are many electrical circuits that require connection by mating terminals, and currently, most connections are achieved by mating male and female terminals. Particularly in wire harnesses with large currents and large wire diameters, such as the charging guns and charging stands for batteries in the rapidly developing new energy vehicles, the internal terminals all have a mating structure of male and female terminals. Due to the large load current, the cross-sectional area of ​​the mating terminals must also be large. Currently, the commonly used mating terminals are all machined from copper rods, which results in low material utilization, a complex processing process, and a long processing time. In particular, the processing of female terminals wastes a lot of copper material, making it impossible to reduce the cost of the charging system.

[0004] Furthermore, in order to assemble and seal the terminal in the power receiving device, an assembly area and a sealing area need to be set up in addition to the electrical function area of ​​the terminal, which not only requires a complex processing process but also results in a loss of some original material, resulting in a lower utilization rate of material.

[0005] Therefore, there is a need for new solutions to solve the above problems in the prior art. Summary of the Invention

[0006] The present application provides a barrel terminal, a mating connection structure and a processing method thereof, which improves the utilization rate of terminal processing materials, simplifies the processing process, saves time, and significantly reduces the production cost of terminals.

[0007] The technical solutions provided in this application are as follows: An embodiment according to a first aspect of the present application is a barrel terminal, including a contact portion, a fixing portion, and a connecting portion, the fixing portion includes an extension portion and an attachment portion provided on the extension portion, the contact portion, the extension portion, and the connection portion are integrally formed from a cylindrical tube; the contact portion has at least two axial slots that divide a side wall of the contact portion into at least two resilient contact pieces; The contact portion is recessed radially inward so that the contact elastic piece forms an arc-shaped structure, The connection portion provides a barrel terminal that is electrically connected to a conductor.

[0008] An embodiment according to a second aspect of the present application provides a mating connection structure including a mating terminal and the barrel terminal described in the embodiment according to the first aspect, wherein the mating terminal is inserted into the contact portion and the outer wall of the mating terminal is tightly attached to the inner wall of the contact elastic piece.

[0009] An embodiment according to a third aspect of the present application is a processing method for manufacturing the barrel terminal according to the embodiment according to the first aspect, Step S10 of manufacturing a cylindrical tube; Step S20 of preparing a press machine and a mold divided into an inner mold having an arc-shaped recess and a first recessed groove and an outer mold having an arc-shaped protrusion and a shear base; Step S30 of placing the inner mold in the cylindrical tube and then placing both of them in the outer mold; Step S40: starting the press machine, moving the arc-shaped protrusion of the outer mold toward the arc-shaped recess of the inner mold, and pressing the contact portion of the cylindrical tube inward to recess it; Step S50: the press machine drives the shear table of the outer mold to continue moving, and presses the shear table of the outer mold to cooperate with the first groove of the inner mold to form an axial slot at the contact portion of the cylindrical tube; and step S60 of driving the press to return the outer mold to its original position, removing the pressed cylindrical tube and the inner mold from the outer mold, and removing the inner mold. A method for processing a barrel terminal is provided.

[0010] The present application can bring about the following beneficial effects:

[0011] 1. The barrel terminal of the present application does not use rod-shaped material but is made by processing a cylindrical tube, which can greatly improve the utilization rate of materials.

[0012] 2. The barrel terminal of the present application can be formed with a press or roll press to form the recess and slot in the contact portion and the opening in the extension portion in one go, eliminating the need for complex machining processes and reducing the number of processing steps.

[0013] 3. The barrel terminal of the present application has the mounting portion directly injection molded into the cylindrical tube, eliminating the need to process the cylindrical tube material, reducing waste material and allowing for the processing of complex mounting shapes.

[0014] 4. The mounting part of the barrel terminal of the present application has a first groove, which allows a seal ring to be mounted therein, or the seal ring can be directly injection molded onto the mounting part, thereby reducing the complexity of the manufacturing process and the number of manufacturing steps.

[0015] 5. The present invention provides an elastic contact piece, which allows the contact portion to adapt to the processing error of the mating terminal, thereby increasing the bonding force between the barrel terminal of the present invention and the mating terminal, ensuring a larger contact area and achieving better electrical and mechanical performance.

[0016] 6. The barrel terminal of the present application allows the cross-sectional shape of the inner hole of the contact part to be designed in various shapes, which allows designers to easily select barrel terminals of different shapes according to the environment in which the barrel terminal will be actually installed, thereby reducing the volume of the mating structure, optimizing the contact area, and enhancing the electrical performance of the barrel terminal.

[0017] 7. The barrel terminal of the present application can be provided with an elastic outer fitting. If the barrel terminal itself is not elastic enough due to its design, the elastic outer fitting can be used to reinforce the clamping force between the barrel terminal and the mating terminal.

[0018] 8. The barrel terminal of the present application is made of tellurium copper alloy, which gives the terminal good conductivity and ease of processing, ensuring electrical performance and improving processability, while also providing excellent elasticity to the tellurium copper alloy.

[0019] 9. The barrel terminal of the present application can further improve its corrosion resistance by adopting a plating layer, and preferably adopting a composite plating layer, which can further improve the durability of the plating layer and ensure that the plating layer will not fall off even after multiple insertions and withdrawals, and ensure corrosion resistance. [Brief explanation of the drawings]

[0020] [Figure 1] Cross-sectional view of a barrel terminal according to the present application. [Figure 2] 10 is a cross-sectional view of an extension portion according to the present invention having an opening formed therein; [Figure 3] 1 is a cross-sectional view of another example of a barrel terminal according to the present application; [Figure 4] 10 is a cross-sectional view of yet another example of a barrel terminal according to the present application; [Figure 5] Schematic diagram of one fitting connection structure of the present application [Figure 6] Schematic diagram of another fitting connection structure of the present application. [Figure 7] 1 is a schematic flowchart of a first embodiment of a method for processing a barrel terminal according to the present application; [Figure 8]1 is a schematic flowchart of a second embodiment of a method for processing a barrel terminal according to the present application. [Figure 9] 1 is a schematic flowchart of a third embodiment of a method for processing a barrel terminal according to the present application. [Figure 10] 1 is a schematic flowchart of a fourth embodiment of a method for processing a barrel terminal according to the present application. [Figure 11] 5 is a schematic flowchart of a fifth embodiment of a method for processing a barrel terminal according to the present application. [Figure 12] 6 is a schematic flowchart of a sixth embodiment of a method for processing a barrel terminal according to the present application. [Figure 13] 7 is a schematic flowchart of a seventh embodiment of a method for processing a barrel terminal according to the present application. [Figure 14] 8 is a schematic flowchart of an eighth embodiment of a method for processing a barrel terminal according to the present application. [Figure 15] 9 is a schematic flowchart of a ninth embodiment of a method for processing a barrel terminal according to the present application. [Figure 16] 10 is a schematic flowchart of a method for manufacturing a barrel terminal according to a tenth embodiment of the present invention. [Figure 17] 15. A schematic flowchart of a fifteenth embodiment of a method for processing a barrel terminal according to the present application. [Figure 18] 16 is a schematic flowchart of a method for manufacturing a barrel terminal according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0021] The present application will now be described in more detail so that those skilled in the art can implement it by referring to the descriptions in the specification. To more clearly understand the technical features, objectives, and effects of the present application, specific embodiments of the present application will be described with reference to the drawings. However, the terms "first," "second," etc., are for illustrative purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the number of the indicated technical features. Therefore, a feature defined by "first," "second," etc., explicitly or implicitly includes one or more of the feature. In the description of the present application, unless otherwise specified, "plurality" means two or more. In the description of the present application, unless otherwise specified, the term "connection" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, a direct connection, or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0022] First Embodiment The present application provides a barrel terminal. As shown in FIG. 1 , the barrel terminal includes a contact portion 10, a fixed portion 20, and a connecting portion 30. The fixed portion 20 includes an extension portion 201 and a mounting portion 202 provided on the extension portion 201. The contact portion 10, the extension portion 201, and the connecting portion 30 are integrally molded from a cylindrical tube. The contact portion 10 has at least two axial slots 102 that divide the side wall of the contact portion 10 into at least two resilient contact pieces 103. The contact portion 10 has a recess 101 extending radially inward so that the resilient contact pieces 103 form an arc-shaped structure. The connecting portion 30 is electrically connected to a conductive wire.

[0023] The barrel terminal of the present application is provided with a contact portion 10, which is hollow with at least one side open, and which engages with a mating terminal 40 to achieve electrical conductivity. The contact portion 10 is provided with at least two axial slots 102 that divide the side wall of the contact portion 10 into at least two resilient contact pieces 103, allowing the contact portion 10 to adapt to machining errors in the mating terminal 40, and each of the resilient contact pieces 103 can be brought into contact with the mating terminal 40, increasing the contact area between the contact portion 10 and the mating terminal 40 and reducing contact resistance. This prevents poor contact between the contact portion 10 and the mating terminal 40 due to an uneven or non-smooth surface of the mating terminal 40, which can cause excessive temperature rise in the terminal mating structure and lead to a fire accident. By providing the contact part 10 with a recess 101 recessed radially inward, the contact elastic piece 103 forms an arc-shaped structure, and the contact elastic piece 103 exerts an inward elastic force, further increasing the bonding force between the contact part 10 and the mating terminal 40. The arc-shaped structure of the contact elastic piece 103 deforms along with the surface of the mating terminal 40, ensuring a larger contact area and achieving better electrical and mechanical performance. This solves the problem that conventional barrel terminals cannot meet the mechanical performance and temperature rise requirements.

[0024] The barrel terminal of the present application is provided with a fixing portion 20 including an extension portion 201 and an attachment portion 202 provided on the extension portion 201. One end of the extension portion 201 is connected to the contact portion 10 and the other end is connected to the connection portion 30, and both the contact portion 10 and the connection portion 30 are electrically connectable to each other. The attachment portion 202 may be formed by pressing or roll-pressing the extension portion 201, or by directly injecting a plastic material onto the extension portion 201 using an injection molding machine. The attachment portion 202 is fixedly connected to the extension portion 201 and is attached and fixed at an attachment position of the power receiving device. The attachment portion 202 allows the barrel terminal to be fixed at the corresponding position on the power receiving device, facilitating connection with the mating terminal 40.

[0025] The barrel terminal of the present application has a connection portion 30 electrically connected to a conductor, thereby enabling power and signal transmission. The cross-sectional shape of the connection portion 30 may be circular, elliptical, open-ended, U-shaped, flat, or polygonal, and different cross-sectional shapes can be selected depending on the cross-sectional shape of the mating conductor or the corresponding connection method. The connection between the connection portion 30 and the conductor can be achieved by crimping or welding. Crimping refers to the use of mechanical deformation to apply pressure to deform the connection portion 30 and a portion of the conductor therein, resulting in sufficient contact between the conductor and the interior of the connection portion 30 and a frictional connection. Welding methods include ultrasonic welding, resistance welding, arc welding, pressure welding, electromagnetic welding, laser welding, etc., and welding the connection portion 30 to a portion of the conductor to achieve stable electrical and mechanical performance.

[0026] In ultrasonic welding, high-frequency vibration waves are transmitted to the surfaces of two objects to be welded, and the surfaces of the two objects are rubbed against each other under pressure to form a fusion bond between molecular layers.

[0027] Resistance welding is a method of achieving welding by passing a strong current through the contact point between the electrode and the workpiece, generating heat through the contact resistance.

[0028] Arc welding is a method of joining metals by using an arc as a heat source and utilizing the physical phenomenon of air discharge to convert electrical energy into the thermal and mechanical energy required for welding. The main methods include arc welding with a welding rod, submerged arc welding, and MIG welding.

[0029] Pressure welding is a method in which pressure is applied to the welding parts, bringing the joining surfaces into close contact and causing a certain degree of plastic deformation to complete the welding.

[0030] Electromagnetic welding uses an electromagnetic induction coil to generate a very strong current in a short time from a single pulse generator, and the electromagnetic field generated by the induction coil causes the materials to collide and press together instantly.

[0031] Laser welding is a highly efficient and precise welding method that uses a high-energy density laser beam as a heat source.

[0032] 1, in the barrel terminal of the present application, a slot 102 in the contact portion 10 penetrates the side of the contact portion 10 away from the fixed portion 20, and one end of the resilient contact piece 103 is a free end. Such resilient contact pieces 103 can accommodate machining errors in the mating terminal 40, and the multiple resilient contact pieces 103 can each connect to the mating terminal 40 through contact, thereby increasing the contact area between the contact portion 10 and the mating terminal 40 and reducing the contact resistance. This prevents poor contact between the contact portion 10 and the mating terminal 40 due to an uneven or non-smooth surface of the mating terminal 40, which can lead to excessive temperature rise in the terminal mating structure and cause a fire accident. Since one end of the contact elastic piece 103 is a free end, the contact force with the mating terminal 40 is ensured by the elasticity of the material of the contact elastic piece 103 itself, and the elastic force is small and it is difficult for the contact elastic piece 103 to recover by itself after deformation, so it is suitable for applications where the current flow is small, the tolerance of the mating terminal 40 is large, and the relative movement after mating is small.

[0033] In the barrel terminal of the present application, the width of the slot 102 in the contact portion 10 on the side closer to the fixed portion 20 is equal to or greater than the width on the side farther from the fixed portion 20. The slot 102 in the contact portion 10 is located on the side farther from the fixed portion 20, and is usually the position where the resilient contact piece 103 and the mating terminal 40 come into contact. To obtain a larger contact area, it is preferable that the width of the slot 102 in the contact portion 10 on the side farther from the fixed portion 20 is smaller. Furthermore, since water and sediment may enter the cavity of the contact portion 10 during use, it is necessary to design a sediment discharge and drainage position in the barrel terminal to improve the performance of the mating structure and extend the service life. Therefore, the wider the width of the slot 102 in the contact portion 10 on the side closer to the fixed portion 20, the better the sediment discharge and drainage performance.

[0034] In the barrel terminal of the present application, in an embodiment where the shape requirements of the fixing portion are not too complicated, the mounting portion 202 can be directly pressed or roll-pressed onto the extension portion 201, without the need for additional processing methods or the need for providing other separate components. Processing is simple, and the slot and recess 101 can be processed at the same time, thereby saving processing man-hours and improving production efficiency.

[0035] The mounting portion 202 of the barrel terminal of the present application can be processed and formed by injection molding when the shape of the fixing portion is complex or when additional components are required for installation. In this case, the mounting portion 202 is generally made of plastic. The injection molding process is mature and requires few processing steps. In addition, plastic materials have high strength, allowing the barrel terminal to be firmly fixed to the power receiving device.

[0036] 2, the barrel terminal of the present application has an opening 206 in the extension portion 201, which allows the mounting portion 202, formed by injection molding, to be integrally formed with the inside and outside of the cylindrical tube. The mounting portion 202 is attached and fixed to an attachment position of the power receiving device, allowing the barrel terminal to be fixed to the corresponding position on the power receiving device and facilitating connection with the mating terminal 40. If the attachment between the mounting portion 202 and the extension portion 201 is unstable, the barrel terminal may move within the power receiving device, causing unstable contact between the barrel terminal and the mating terminal 40, and preventing the mating structure from achieving good mechanical and electrical performance. If an opening is provided in the extension portion 201, when the mounting portion 202 is injection molded, the molten material of the mounting portion 202 can enter the interior of the cylindrical tube along the opening from the outside of the cylindrical tube, firmly connecting the mounting portion 202 and the extension portion 201. This prevents the mounting portion 202 and the extension portion 201 from separating during use of the interlocking structure, ensuring the stability of the interlocking structure.

[0037] In the barrel terminal of the present application, the tubular tube is a seamless tube or a seam tube manufactured by winding a plate material. When processing the barrel terminal of the present application, the clamping force is mainly provided by the elasticity of the contact elastic piece 103, so there is no high requirement for whether the tubular tube can be closed or not, and therefore the tubular tube may be a seamless tube or a seam tube.

[0038] If the cylindrical tube is a seam tube, the width of the seam of the cylindrical tube must not be larger than the width of the slot 102 in the contact part 10, and no seam must exist in the contact elastic piece 103 during the processing process. Therefore, the slot 102 in the contact part 10 is provided in the seam of the cylindrical tube, thereby ensuring the elasticity of the contact elastic piece 103 and making it more stable after the barrel terminal is mated with the mating terminal 40.

[0039] In the barrel terminal of the present application, the inscribed cross-sectional shape of the inner surface of the arc-shaped structure of the contact portion 10 can be circular, elliptical, polygonal, flat, E-shaped, F-shaped, H-shaped, K-shaped, L-shaped, T-shaped, U-shaped, V-shaped, W-shaped, X-shaped, Y-shaped, Z-shaped, semicircular, arc-shaped, or wavy. The inscribed cross-sectional shape of the inner surface of the arc-shaped structure of the contact portion 10 can be designed in a variety of shapes, allowing designers to easily select barrel terminals of different shapes depending on the environment in which the barrel terminal will be installed, thereby reducing the volume of the mating structure, optimizing the contact area, and enhancing the electrical performance of the barrel terminal. Furthermore, the diverse inscribed cross-sectional shapes of the barrel terminal allow it to be matched with a wider variety of mating terminal shapes, providing designers with more options.

[0040] In the barrel terminal of the present application, the distance between the inner surface of the arc-shaped structure of the contact portion 10 and the axis of the barrel terminal is constant. When the cross-sectional area of ​​the mating terminal 40 at the mating position is circular, the contact distance between the resilient contact piece 103 and the mating terminal 40 is constant, which ensures that the clamping force between the resilient contact piece 103 and the mating terminal 40 is approximately constant, thereby providing the mating structure with stable electrical and mechanical performance and achieving a longer service life.

[0041] In some embodiments, the contact portion has an outwardly expanding chamfer at one end thereof that is away from the fixed portion, and the chamfer angle ranges from 17° to 178°. The front expanding opening is advantageous for guiding and inserting the mating terminal 40. The inventors have repeatedly tested different angles and found that if the chamfer angle is less than 17°, it is difficult to directly insert the mating terminal 40 into the contact portion 10, and multiple insertion operations are required to complete the mating. Similarly, if the chamfer angle is greater than 178°, the mating terminal 40 is likely to abut against the inside of the chamfer when inserted, and multiple insertion operations are required to complete the mating.

[0042] The inventor conducted a test by selecting 10 mating terminals with the same diameter and the same expansion / contraction slit width, setting different chamfer angles for each, and matching them with the same mating terminal 40. He then performed 10,000 insertion / extraction tests, counting the number of mating failures and recording the numerical values. The test results are shown in Table 1.

[0043] In this embodiment, the ideal number of times of poor fitting is less than 5 times.

[0044] Table 1: Effect of different chamfer angles on the number of mating failures of mating connection structures

[0045] [Table 1]

[0046] As can be seen from Table 1, when the chamfer angle at the contact portion is less than 17° or more than 178°, the number of mating failures when inserting the mating terminal 40 into the mating terminal exceeds the ideal value in both cases, making it impossible to ensure the operational stability of the mating connection structure. The mating failures damage the terminals, significantly shortening the service life of the mating connection structure. In the worst case, the terminals may be broken, and the mating connection structure may overheat, causing the power receiving device to burn out and resulting in electric shock, resulting in death or injury. Therefore, the inventors set the chamfer angle range at the contact portion to 17° to 178°.

[0047] The barrel terminal of the present application can be made of copper or a copper alloy, which has good electrical conductivity and excellent elasticity. However, as the price of copper increases, the cost of using copper as the material for the barrel terminal also increases. The aluminum content in the earth's crust is approximately 7.73%, and with the optimization of refining technology, its price has become relatively low. Aluminum is lighter than copper, and its electrical conductivity is second only to copper. Therefore, aluminum can partially replace copper in the field of electrical connections. Therefore, aluminum or an aluminum alloy, which has good electrical conductivity, common elasticity, and is less expensive, can be selected.

[0048] When a copper alloy is selected as the material for the barrel terminal, it is preferable to add tellurium to the copper material, so that the terminal has good conductivity and ease of cutting, and can improve processability while ensuring electrical performance. At the same time, the tellurium copper alloy also has excellent elasticity.

[0049] Preferably, the tellurium content in the tellurium copper alloy is 0.1% to 5%, and more preferably, the tellurium content in the tellurium copper alloy is 0.2% to 1.2%.

[0050] The inventors conducted tests on 10 mating terminals with the same shape and the same expansion / contraction slit width. Each terminal was made of tellurium copper alloy, with the tellurium content of 0.05%, 0.1%, 0.2%, 1%, 1.2%, 1.8%, 3%, 5%, 6%, and 7%, respectively. The test results are shown in Table 2.

[0051] Table 2: Effect of different tellurium content on electrical conductivity of copper tellurium alloys

[0052] [Table 2]

[0053] As can be seen from Table 2, when the tellurium content is less than 0.1% or more than 5%, the conductivity is significantly reduced and cannot meet practical needs. The best conductivity is achieved when the tellurium content is between 0.2% and 1.2%, so the inventors select tellurium copper alloys with a tellurium content of 0.1% to 5%. Most ideally, tellurium copper alloys with a tellurium content of 0.2% to 1.2% are selected.

[0054] The power receiving device in which the barrel terminal of the present application is installed is often operated outdoors, making water intrusion into the power receiving device inevitable. Therefore, a sealing structure must be provided on the barrel terminal to ensure the safety of the electrical connection and the service life of the power receiving device. The barrel terminal is assembled to the power receiving device via a mounting part 202, which requires a first groove 203 formed on the outer periphery of the mounting part 202 and a sealing ring to be fitted in the first groove 203. The sealing ring cooperates with the interior of the power receiving device to effectively seal the power receiving device and prevent external water from entering the power receiving device. The sealing ring is made of rubber, which has good elasticity and is compressed and deformed after assembly of the barrel terminal to the power receiving device to form a sealing structure that prevents water from entering the power receiving device. Furthermore, the rubber material has good water and oil resistance, which can extend the service life of the sealing structure.

[0055] As shown in FIGS. 1 and 3 , the barrel terminal of the present application has a second groove 104 formed circumferentially on the outer side of the contact portion 10. The second groove 104 is an annular groove, and at least one elastic outer fitting 105 is fitted in the second groove 104 to bias the contact portion 10 and improve the adhesion between the resilient contact piece 103 and the mating terminal 40. Depending on the operating environment, if the barrel terminal is too thin, has too many openings, or has a large difference in diameter from the mating terminal 40, the clamping force between the resilient contact piece 103 and the mating terminal 40 may be insufficient, resulting in a smaller contact area between the barrel terminal and the mating terminal 40 and poor electrical performance. If the barrel terminal itself lacks elasticity due to design factors, the elastic outer fitting 105 can be used to compensate for the clamping force of the barrel terminal on the mating terminal 40. The elastic outer fitting member 105 may be an elastic rubber body or an open elastic rigid body, which can restrict the contact elastic piece 103 of the barrel terminal from further expanding outward and increase the clamping force between the contact elastic piece 103 and the mating terminal 40.

[0056] When the barrel terminal of the present application has a plating layer at least partially provided on the contact portion 10 and / or the connection portion 30, it can improve corrosion resistance, improve electrical conductivity, increase the number of mating cycles, and better extend the service life of the contact portion 10 and the connection portion 30.

[0057] The plating layer can be formed by a method such as electroplating, electroless plating, magnetron sputtering, or vacuum plating.

[0058] Electroplating is a process of plating a thin layer of one metal or alloy onto the surface of another metal by utilizing the principle of electrolysis.

[0059] The electroless plating method is a layer-by-layer process that produces metals through a controllable oxidation-reduction reaction, catalyzed by metals.

[0060] The magnetron sputtering method uses the interaction of a magnetic field and an electric field to move electrons in a spiral pattern near the target surface, increasing the probability that the electrons will collide with argon gas and generate ions. The generated ions collide with the target surface under the influence of an electric field, sputtering the target material.

[0061] Vacuum plating processes involve depositing various metallic and non-metallic films onto the surface of components by evaporation or sputtering under vacuum conditions.

[0062] The plating layer material can be one or a combination of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, and silver-gold-zirconium alloy. Copper and aluminum are active metals that undergo oxidation reactions with oxygen and water during use. Therefore, to extend the service life of barrel terminals, one or more inert metals are required for the plating layer. Furthermore, for metal contacts that require constant insertion and removal, a highly wear-resistant metal is required for the plating layer, significantly extending the service life of the contacts. Furthermore, the contacts must also have good electrical conductivity. The conductivity and stability of these metals are superior to those of copper or copper alloys, aluminum, or aluminum alloys, resulting in better electrical performance and a longer service life for barrel terminals.

[0063] To verify the effect of different plating layer materials on the overall performance of the barrel terminal, the inventors conducted a series of insertion / extraction cycle and corrosion resistance time tests using barrel terminals of the same standard and material but with different plating layer materials as samples, using mating terminals 40 of the same standard. The experimental results are shown in Table 3 below.

[0064] The number of insertions and removals in Table 3 below was determined by fixing the barrel terminal and the mating terminal 40 to a test bench, and using a machine to simulate insertion and removal of the barrel terminal and the mating terminal 40. After 100 insertions and removals, the damage to the plating layer on the surface of the barrel terminal was observed, and the experiment was stopped until scratches were formed on the plating layer on the surface of the barrel terminal and the material of the barrel terminal itself was exposed, and the number of insertions and removals at that time was recorded. In this example, products with fewer than 8,000 insertions and removals were deemed to have failed.

[0065] For the corrosion resistance time test in Table 3 below, the barrel terminal was placed in a salt mist spray test box, and salt mist was sprayed at various positions on the barrel terminal. One cycle consisted of removing the terminal and cleaning it every 20 hours to observe the surface corrosion. When the surface corrosion area of ​​the barrel terminal exceeded 10% of the total area, the test was stopped and the number of cycles at that time was recorded. In this example, a product with fewer than 80 cycles was deemed unacceptable.

[0066] Table 3: Effect of different plating materials on barrel terminal insertion / extraction cycles and corrosion resistance

[0067] [Table 3]

[0068] As can be seen from Table 3 above, when the selected plating layer material is gold, silver, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, or silver-gold-zirconium alloy, the experimental results far exceed the standard values ​​and the performance is stable. Even when the selected plating layer material is nickel, tin, tin-lead alloy, or zinc, the experimental results can meet the requirements. Therefore, the inventors select the plating layer material to be one or a combination of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, or silver-gold-zirconium alloy.

[0069] The plating layer includes an underlayer and a surface layer.

[0070] In some embodiments, the plating layer is formed by multi-layer plating. After the contact portion 10 and the connection portion 30 are processed, many slits and holes still exist at the microscopic interface between their surfaces. These slits and holes are the primary cause of wear and corrosion of the contact portion 10 and the connection portion 30 during use. Therefore, the surfaces of the contact portion 10 and the connection portion 30 must first be plated with a base layer, which fills the slits and holes on the surface and ensures that the surfaces of the contact portion 10 and the connection portion 30 are flat and hole-free. The surface plating layer is then plated, which provides a stronger bond, a flatter surface, and eliminates slits and holes. This improves the wear resistance, corrosion resistance, and electrical performance of the barrel terminal, significantly extending the service life of the barrel terminal.

[0071] The material of the base layer of the plating layer is one or a combination of several types of gold, silver, nickel, tin, tin-lead alloy, and zinc, and the material of the surface layer of the plating layer is one or a combination of several types of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, and silver-gold-zirconium alloy.

[0072] In another embodiment, the thickness of the underlayer is 0.01 μm to 15 μm. Preferably, the thickness of the underlayer is 0.1 μm to 9 μm.

[0073] In another embodiment, the thickness of the surface layer is between 0.5 μm and 55 μm. Preferably, the thickness of the surface layer is between 1 μm and 35 μm.

[0074] In order to verify the effect of changes in the thickness of the plating layer used as the base layer on the overall performance of the barrel terminal, the inventors conducted a series of temperature rise and corrosion resistance time tests using barrel terminals of the same standard and material, but with different nickel plating base layer thicknesses and the same silver plating surface layer thickness, as samples, using mating terminals 40 of the same standard. The experimental results are shown in Table 4 below.

[0075] The temperature rise test in Table 4 below was performed by passing the same current through the barrel terminal and the mating terminal 40 after mating, detecting the temperature at the same position on the barrel terminal in a closed environment before current was passed and after the temperature had stabilized, and then calculating the difference as an absolute value. In this example, a temperature rise of more than 50 K was deemed a failure.

[0076] For the corrosion resistance time test in Table 4 below, the barrel terminal was placed in a salt mist spray test box, and salt mist was sprayed at various positions on the barrel terminal. One cycle consisted of removing the terminal and cleaning it every 20 hours to observe the surface corrosion. When the surface corrosion area of ​​the barrel terminal exceeded 10% of the total area, the test was stopped and the number of cycles at that time was recorded. In this example, products with fewer than 80 cycles were deemed unacceptable.

[0077] Table 4: Effect of different undercoat and plating thicknesses on temperature rise and corrosion resistance of barrel terminals

[0078] [Table 4]

[0079] As can be seen from Table 4 above, when the thickness of the nickel plating layer (base layer) is less than 0.01 μm, the temperature rise of the barrel terminal passes the test, but because the plating layer is too thin, the number of corrosion resistance cycles of the barrel terminal is less than 80, which does not meet the performance requirements of the barrel terminal. This significantly affects the overall performance and lifespan of the mating component, and in the worst case, it may significantly shorten the product lifespan or even cause a fire accident due to ineffectiveness. When the thickness of the nickel plating layer (base layer) exceeds 15 μm, the thick plating layer (base layer) prevents heat generated from the barrel terminal from being dissipated, resulting in a failure of the temperature rise of the barrel terminal. Furthermore, a thicker plating layer is more likely to peel off from the terminal surface, resulting in a decrease in the number of corrosion resistance cycles. Therefore, the inventors limit the thickness of the plating layer (base layer) to 0.01 μm to 15 μm. Preferably, the inventors have found that when the thickness of the plating layer serving as the base layer is 0.1 μm to 9 μm, the overall effect of the barrel terminal on temperature rise and corrosion resistance is better. Therefore, in order to further improve the safety reliability and practicability of the product itself, the thickness of the plating layer serving as the base layer is preferably 0.1 μm to 9 μm.

[0080] In order to verify the effect of changes in the thickness of the surface plating layer on the overall performance of the barrel terminal, the inventors used barrel terminals of the same specifications and material, with the same nickel plating underlayer thickness and different silver plating surface layer thicknesses, and used mating components of the same specifications to conduct a series of temperature rise and corrosion resistance time tests. The experimental results are shown in Table 5 below.

[0081] The experimental method was the same as that described above.

[0082] Table 5: Effect of different thicknesses of plating layers on temperature rise and corrosion resistance

[0083] [Table 5]

[0084] As can be seen from Table 5 above, when the thickness of the silver plating layer (surface layer) is less than 0.5 μm, the barrel terminal passes the temperature rise test. However, because the plating layer is too thin, the number of corrosion resistance cycles of the barrel terminal is less than 80, failing to meet the performance requirements of the barrel terminal. This significantly affects both the overall performance and lifespan of the mating structure. In the worst case, this can lead to a drastic reduction in product lifespan and even a fire accident due to ineffectiveness. When the thickness of the silver plating layer (surface layer) exceeds 55 μm, the thick plating layer (base layer) prevents heat generated from the barrel terminal from being dissipated, resulting in a failure of the temperature rise test of the barrel terminal. Furthermore, a thicker plating layer can easily peel off from the terminal surface, resulting in a decrease in the number of corrosion resistance cycles. Furthermore, because the metal used for the surface plating layer is expensive, a thick plating layer not only fails to improve performance but is also not worth using. Therefore, the inventors limit the thickness of the silver plating layer (surface layer) to 0.1 μm to 55 μm. Preferably, the inventors have found that when the thickness of the surface plating layer is 1 μm to 35 μm, the overall effects of the temperature rise and corrosion resistance of the barrel terminal are better, so in order to further improve the safety reliability and practicability of the product itself, the thickness of the surface plating layer is preferably 1 μm to 35 μm.

[0085] This application provides a barrel terminal that uses a cylindrical tube as the terminal material and produces the mounting part by injection molding, thereby improving the utilization rate of the terminal processing material, simplifying the processing process and shortening the processing time, and significantly reducing the terminal production cost.The provision of a contact elastic piece and an elastic outer member not only ensures effective contact connection when the barrel terminal is in use, but also effectively reduces the risk of personal injury or equipment damage caused by electric shock due to a defective mating part structure.

[0086] Embodiment 2 The barrel terminal in this embodiment is basically the same as the barrel terminal in the first embodiment, with the following differences.

[0087] 3, in the barrel terminal of the present application, both ends of the slot 102 in the contact portion 10 are closed, and both ends of the resilient contact piece 103 are fixed. Because both ends of this type of resilient contact piece 103 are fixed, the resilient contact piece 103 near the center deforms to provide a clamping force to the mating terminal 40, which provides a greater clamping force and a larger contact area than a resilient contact piece 103 with one end free, ensuring that the terminal mating structure has good mechanical and electrical performance, but because both ends of the resilient contact piece 103 are fixed, no large deformation occurs, making it suitable for applications where the tolerance of the mating terminal 40 is small and the current flow is large.

[0088] In the barrel terminal of the present application, the side wall of the extension portion 201 is formed in a bellows shape 205, and the mounting portion 202 is molded on the outer periphery of the extension portion 201. If the current flowing through the barrel terminal is too large and there is not much margin in the design of the cross-sectional area of ​​the terminal, the cross-sectional area of ​​the barrel terminal will be small, increasing the resistance and the amount of heat generated by the barrel terminal, making it disadvantageous to have an opening in the extension portion 201. To ensure a strong connection between the mounting portion 202 and the extension portion 201, the side wall of the extension portion 201 is formed in a bellows shape 205, and the mounting portion 202 is directly injection molded on the outer periphery of the extension portion 201. The interior of the mounting portion 202 matches the bellows shape 205 of the extension portion 201, creating a larger contact area and preventing axial displacement between the mounting portion 202 and the extension portion 201, ensuring the stability of the mating structure.

[0089] 3, the barrel terminal of the present application has a first groove 203 formed on the outer periphery of mounting portion 202. The barrel terminal is then placed in a mold of an injection molding machine, and a seal ring is then injection-molded to integrate the seal ring with mounting portion 202. This eliminates the seal ring installation process, improves the possibility of automating the assembly line, and prevents the seal ring from being forgotten or falling off, thereby preventing poor sealing of the power receiving device due to forgetting to install or falling off. Because the seal ring is integrated with mounting portion 202, when the barrel terminal is installed, the seal ring will not come off first groove 203 due to friction with the installation position, ensuring stable sealing and extending the service life of the power receiving device.

[0090] Embodiment 3 The barrel terminal in this embodiment is basically the same as the barrel terminal in the second embodiment, with the following differences.

[0091] As shown in Figure 4, the barrel terminal of the present application has a slot 102 in the contact portion 10 that is inclined relative to the axis of the barrel terminal. After the barrel terminal is mated with the mating terminal 40, the inclined slot 102 allows the interior of the resilient contact piece 103 to make spiral contact with the surface of the mating terminal 40, thereby achieving a larger contact area, reducing the contact resistance of the mating structure and ensuring reliable electrical performance. Furthermore, by providing the inclined slot 102, the contact portion 10 of the barrel terminal can be made shorter, thereby saving material usage and significantly reducing the design space of the power receiving device, making the design more compact and lightweight, and optimizing the spatial structure of the power receiving device.

[0092] As shown in Figure 4, in the barrel terminal of the present application, the diameter of the connecting portion 30 is equal to or smaller than the diameter of the contact portion 10 or the extension portion 201. In some usage environments, the inner diameter of the cylindrical tube is much larger than the diameter of the conductor connecting portion. In this case, connecting the connecting portion 30 to the conductor by crimping or welding may cause significant deformation of the connecting portion 30, resulting in an unstable connection between the connecting portion 30 and the conductor. Therefore, by reducing the inner diameter of the connecting portion 30 according to the outer diameter of the conductor connecting portion to which the barrel terminal is to be connected, the dimensions of the connecting portion 30 and the conductor connecting portion can be matched, making the crimping or welding process between the connecting portion 30 and the conductor connecting portion easier and achieving a more stable electrical connection.

[0093] Embodiment 4 5, the present application further provides a mating connection structure including a mating terminal 40 and the barrel terminal of the first embodiment, in which the contact portion of the mating terminal 40 is inserted into the cavity of the contact portion 10 of the barrel terminal, and the outer wall of the mating terminal 40 is in close contact with the inner wall of the cavity of the contact portion 10 of the barrel terminal. The barrel terminal of this embodiment has the same structure, principle of operation, and beneficial effects as the first embodiment, and therefore a detailed description thereof will be omitted here.

[0094] Furthermore, an insulating protective cap 401 is provided at the front end of the mating terminal 40 to prevent the arc temperature from becoming too high due to discharge at the contact position when the mating terminal 40 and the barrel terminal are mated, causing the terminal surface or the power receiving device or mounting portion 202 to melt.

[0095] As shown in FIG. 6, a positioning hole 402 is provided at the front end of the mating terminal 40, and a positioning pin 207 is provided within the mounting portion 202 of the barrel terminal. The positioning pin 207 and the positioning hole 402 of the mating terminal 40 are inserted into each other and connected, thereby positioning the long mating terminal 40 within the barrel terminal and preventing the front end of the mating terminal 40 from swinging within the contact portion 10 of the barrel terminal due to vibration. This prevents changes in contact resistance due to swinging and maintains a stable current in the mating connection structure. It also prevents short circuits caused by cables connected to the rear ends of the mating terminals coming into contact with each other due to excessive swing of the mating terminal 40, thereby reducing the risk of short circuits and injuries due to electric shock.

[0096] Fifth embodiment The present application further provides a method for processing a barrel terminal, as shown in Figure 7, comprising the following steps:

[0097] In S10, a cylindrical tube is manufactured. The material of the cylindrical tube is selected based on the required conductivity and elasticity of the material, the inner diameter of the cylindrical tube is selected based on the outer diameter of the mating terminal 40, the wall thickness of the cylindrical tube is selected based on the current to be carried by the barrel terminal, and the length of the cylindrical tube is selected based on the installation space and position of the barrel terminal.

[0098] In S20, a press machine and an extrusion die divided into an inner die having an arc-shaped recess 101 and a recessed groove and an outer die having an arc-shaped protrusion and a press shear base are prepared. The dimensions of the inner die and the outer die match the cylindrical tube, and the arc-shaped recess 101 of the inner die and the arc-shaped protrusion of the outer die work together to form the recess 101 in the contact portion 10 of the barrel terminal, and the recessed groove of the inner die and the press shear base of the outer die work together to form the slot 102 in the contact portion 10 of the barrel terminal.

[0099] In S30, the inner mold is placed in the cylindrical tube, and then both are placed in the outer mold.

[0100] In S40, the press is started, and the arc-shaped protrusions of the outer mold are moved toward the arc-shaped recesses of the inner mold, pressing the contact portion 10 of the cylindrical tube inward to recess it. The arc-shaped protrusions of the outer mold are arranged circumferentially, and are each driven by a driving device to move in the axial direction of the barrel terminal until the recesses 101 of the contact portion 10 are press-formed.

[0101] In S50, the press machine drives the pressing shear table of the outer mold to continue moving, and in cooperation with the groove of the inner mold, presses the contact portion 10 of the cylindrical copper tube so as to form an axial slot 102. The pressing shear tables of the outer mold are arranged in the circumferential direction and are each driven by a driving device to move in the axial direction of the barrel terminal until the slot 102 of the contact portion 10 is shear-formed.

[0102] In S60, the press machine drives the outer mold to return to its original position, and the pressed cylindrical tube and inner mold are removed from the outer mold, and the inner mold is then removed.

[0103] In certain embodiments, S50 includes shearing or cutting an axial slot in the contact portion of the cylindrical tube using a shearing device.

[0104] Sixth embodiment The present application further provides another method for manufacturing a barrel terminal, as shown in Figure 8, which includes the following steps:

[0105] In S10, a cylindrical tube is manufactured. The material of the cylindrical tube is selected based on the required conductivity and elasticity of the material, the inner diameter of the cylindrical tube is selected based on the outer diameter of the mating terminal 40, the wall thickness of the cylindrical tube is selected based on the current to be carried by the barrel terminal, and the length of the cylindrical tube is selected based on the installation space and position of the barrel terminal.

[0106] In S20, a roll press machine and a roll press mold divided into an inner mold having an arc-shaped recess 101 and a recessed groove and an outer mold having an arc-shaped protrusion and a shearing base are prepared. The dimensions of the inner mold and the outer mold match the cylindrical tube, and the arc-shaped recess of the inner mold and the arc-shaped protrusion of the outer mold work together to process the recess 101 in the contact portion 10 of the barrel terminal, and the recessed groove of the inner mold and the pressing shearing base of the outer mold work together to process the slot 102 in the contact portion 10 of the barrel terminal.

[0107] In S30, the inner mold is placed in the cylindrical tube, and then both are placed in the outer mold.

[0108] In S40, the roll press machine is started, and the arc-shaped protrusion of the outer mold is moved toward the arc-shaped recess of the inner mold to roll-press the contact portion 10 of the cylindrical tube so as to recess it inward. The outer mold is divided into an upper mold and a lower mold, and the lower mold is fixed in place while the upper mold is driven to approach the lower mold as a whole. The relative rolling of the upper and lower molds roll-presses the cylindrical tube between the upper and lower molds, and in cooperation with the inner mold, roll-presses the recess 101 in the contact portion 10.

[0109] In S50, the roll press machine drives the shear table of the outer mold to continue moving, and in cooperation with the groove of the inner mold, roll presses the contact portion 10 of the cylindrical tube to have an axial slot 102.

[0110] In S60, the roll press machine drives the outer mold to return to its original position, and the roll-pressed cylindrical tube and inner mold are removed from the outer mold, and the inner mold is then removed.

[0111] In certain embodiments, S50 includes shearing or cutting an axial slot in the contact portion of the cylindrical tube using a shearing device.

[0112] The only difference between this embodiment and the first embodiment is the processing equipment used, but the barrel terminals manufactured are the same.

[0113] Embodiment 7 As shown in FIG. 9, the present application further provides another barrel terminal processing method, which includes:

[0114] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that after step S40, it further includes step S45, in which the outer mold is moved toward the inner mold and the extension portion of the cylindrical tube is press-molded to form the mounting portion.

[0115] Eighth embodiment As shown in FIG. 10 , the present application further provides another barrel terminal processing method, which includes:

[0116] The processing method of this example is basically the same as that of the fifth and sixth embodiments, except that after step S50, it further includes step S56 of cutting an opening in the extension portion 201. In this case, the opening may be formed by pressing or roll pressing together with the slot 102 in the contact portion 10.

[0117] Ninth Embodiment As shown in FIG. 11, the present application further provides another barrel terminal processing method, which includes:

[0118] The processing method of this example is basically the same as that of the fifth and sixth embodiments, except that after step S50, step S57 is further included in which bellows-like shapes 205 are formed on the extension portion 201 by pressing or roll pressing. In this case, the bellows-like shapes 205 may be processed and formed together with the recesses 101 in the contact portion 10 by pressing or roll pressing.

[0119] Embodiment 10 As shown in FIG. 12, the present application further provides another barrel terminal processing method, which includes:

[0120] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that after step S60, it further includes step S70 of inserting the pressed or roll-pressed cylindrical tube into an injection molding machine to injection mold the mounting part.

[0121] Eleventh Embodiment As shown in FIG. 13, the present application further provides another barrel terminal processing method, which includes:

[0122] The processing method of this example is basically the same as that of the fifth and sixth embodiments, except that after step S50, it further includes step S58 of forming second grooves 104 by pressing or roll-pressing the contact portion 10. In this case, the second grooves 104 may be formed together with the recesses 101 in the contact portion 10 by pressing or roll-pressing.

[0123] Twelfth embodiment As shown in FIG. 14, the present application further provides another barrel terminal processing method, which includes:

[0124] The processing method of this example is basically the same as that of the fifth and sixth embodiments, except that after step S50, step S59 is further included in which the connecting portion 30 is pressed or roll-pressed until the diameter is reduced. In this case, step 59 may be performed by pressing or roll-pressing together with the recess 101 in the contact portion 10.

[0125] Embodiment 13 As shown in FIG. 15, the present application further provides another barrel terminal processing method, which includes:

[0126] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that after step S60, it further includes step S66 of providing a plating layer on at least the contact portion 10 and / or the connection portion 30.

[0127] Embodiment 14 As shown in FIG. 16, the present application further provides another barrel terminal processing method, which includes:

[0128] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that after step S60, it further includes step S80 of inserting the barrel terminal that has been injection molded into an injection molding machine to injection mold a sealing ring.

[0129] Embodiment 15 As shown in FIG. 17, the present application further provides another barrel terminal processing method, which includes:

[0130] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that it further includes step S90 of mounting a seal ring in the first groove 203 after step S60.

[0131] Sixteenth Embodiment As shown in FIG. 18, the present application further provides another barrel terminal processing method, which includes:

[0132] The processing method of this embodiment is basically the same as that of the fifth and sixth embodiments, except that after step S70, it further includes step S100 of fitting an elastic outer fitting member 105 into the second groove 104.

[0133] Although the embodiments of the present application have been disclosed as above, they are not limited to the examples listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art. Therefore, the present application is not limited to the specific details and examples shown and described herein, unless departing from the general concept limited to the scope of the claims and the equivalent scope.

Claims

1. A barrel terminal, a contact portion, a fixing portion, and a connecting portion; the fixing portion includes an extension portion and an attachment portion provided on the extension portion, the contact portion, the extension portion, and the connection portion are integrally formed by processing a cylindrical tube, the contact portion has at least two axial slots that divide a side wall of the contact portion into at least two resilient contact pieces; the contact portion is provided with a recess recessed inward in a radial direction so that the contact elastic piece forms an arc-shaped structure; the connection portion is electrically connected to a conductive wire, The width of the slot on the side closer to the fixed portion is larger than the width on the side farther from the fixed portion. Barrel terminal.

2. The slot penetrates the contact portion on the side away from the fixed portion, and one end of the contact elastic piece is a free end. The barrel terminal according to claim 1 .

3. Both ends of the slot are closed, and both ends of the contact elastic piece are fixed. The barrel terminal according to claim 1 .

4. The slot is provided at an angle with respect to the axis of the barrel terminal. The barrel terminal according to claim 1 .

5. The mounting portion is press-formed from the extension portion. The barrel terminal according to claim 1 .

6. The mounting portion is made of plastic material and is provided on the extension portion by injection molding. The barrel terminal according to claim 1 .

7. The extension portion has an opening so that the mounting portion is integrated with the inside and outside of the cylindrical tube. The barrel terminal according to claim 6 .

8. The side wall of the extension portion is provided in a bellows shape, and the attachment portion is molded on the outer periphery of the extension portion. The barrel terminal according to claim 6 .

9. The cylindrical pipe is a seamless pipe or a seam pipe made by winding a plate material. The barrel terminal according to claim 1 .

10. When the cylindrical tube is a seamed tube, the contact elastic piece has no seam. The barrel terminal according to claim 9.

11. The inscribed cross-sectional shape of the inner surface of the arc-shaped structure is any one of a circle, an ellipse, a polygon, a flattened shape, an E-shape, an F-shape, an H-shape, a K-shape, an L-shape, a T-shape, a U-shape, a V-shape, a W-shape, an X-shape, a Y-shape, a Z-shape, a semicircular arc shape, an arc shape, and a wave shape. The barrel terminal according to claim 1 .

12. In a cross section of the arc-shaped structure perpendicular to the axis of the barrel terminal, the distances from any two points on the inner surface of the contact resilient piece forming the arc-shaped structure to the axis of the barrel terminal are the same. The barrel terminal according to claim 1 .

13. The diameter of the connection portion is equal to or smaller than the diameter of the contact portion or the extension portion. The barrel terminal according to claim 1 .

14. The contact portion has an end portion that is away from the fixed portion and is provided with an outwardly expanding chamfer, and the angle of the chamfer ranges from 17° to 178°. The barrel terminal according to claim 1 .

15. The cylindrical tube is made of any one of copper, copper alloy, aluminum, and aluminum alloy. The barrel terminal according to claim 1 .

16. When the material of the cylindrical tube is a copper alloy, the copper material contains tellurium. The barrel terminal of claim 15.

17. The tellurium content in the material of the cylindrical tube is 0.1% to 5%. The barrel terminal of claim 16.

18. a first groove is provided on the outer periphery of the mounting portion; The barrel terminal further includes a seal ring that is disposed in the first groove and is made of a rubber material. The barrel terminal according to claim 1 .

19. a second groove provided along a circumferential direction on the outer side of the contact portion; The barrel terminal further includes an elastic outer fitting member made of rubber and fitted in the second groove. The barrel terminal according to claim 1 .

20. The contact portion and / or the connection portion are at least partially provided with a plating layer. The barrel terminal according to claim 1 .

21. The material of the plating layer is one or a combination of several of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, and silver-gold-zirconium alloy. The barrel terminal of claim 20.

22. The plating layer includes a base layer and a surface layer.

22. The barrel terminal of claim 21.

23. the material of the underlayer is one or a combination of two or more of gold, silver, nickel, tin, a tin-lead alloy, and zinc; The material of the surface layer is one or a combination of several of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, and silver-gold-zirconium alloy.

23. The barrel terminal of claim 22.

24. The thickness of the underlayer is 0.01 μm to 15 μm.

23. The barrel terminal of claim 22.

25. The thickness of the underlayer is 0.1 μm to 9 μm.

23. The barrel terminal of claim 22.

26. The thickness of the surface layer is 0.5 μm to 55 μm.

23. The barrel terminal of claim 22.

27. The thickness of the surface layer is 1 μm to 35 μm.

23. The barrel terminal of claim 22.

28. A fitting connection structure, a mating terminal and the barrel terminal according to any one of claims 1 to 27, wherein the mating terminal is inserted into the contact portion and an outer wall of the mating terminal is brought into close contact with an inner wall of the contact resilient piece; Interlocking connection structure.

29. A positioning pin is provided in the mounting portion of the barrel terminal, and a positioning hole is provided at the tip of the mating terminal, and the positioning pin is inserted into the positioning hole.

29. The mating connection structure according to claim 28.

30. A processing method for manufacturing the barrel terminal according to any one of claims 1 to 27, comprising: Step S10 of manufacturing a cylindrical tube; Step S20 of preparing a press machine and a mold divided into an inner mold having an arc-shaped recess and a first recessed groove and an outer mold having an arc-shaped protrusion and a shearing blade; Step S30: placing the inner mold in the cylindrical tube and then placing both of them in the outer mold; Step S40: starting the press machine, moving the arc-shaped protrusion of the outer mold toward the arc-shaped recess of the inner mold, and pressing the contact portion of the cylindrical tube inward to recess it; Step S50: the press machine drives the shear blade of the outer die to continue moving, and presses the outer die to cooperate with the first groove of the inner die to form an axial slot in the contact portion of the cylindrical tube; and step S60 of driving the press to return the outer mold to its original position, removing the pressed cylindrical tube and the inner mold from the outer mold, and removing the inner mold. How to process barrel terminals.

31. The press in steps S20, S40, S50 and S60 is a roll press. The method for processing a barrel terminal according to claim 30.

32. In step S50, an axial slot is formed in the contact portion of the cylindrical tube by shearing or cutting. The method for processing a barrel terminal according to claim 30.

33. After step S40, the method further includes step S45 of moving the outer mold toward the inner mold to press-form the extension portion of the cylindrical tube to form the mounting portion. The method for processing a barrel terminal according to claim 30.

34. After step S50, the method further includes step S56 of cutting an opening in the extension. The method for processing a barrel terminal according to claim 30.

35. After step S50, step S57 is further included in which the extension portion is pressed or roll-pressed to form a bellows shape. The method for processing a barrel terminal according to claim 30.

36. After step S60, the method further includes step S70 of inserting the pressed or roll-pressed cylindrical tube into an injection molding machine to injection mold the mounting part. The method for processing a barrel terminal according to claim 30.

37. After step S50, step S58 is further included in which a second groove is formed in the contact portion by pressing or roll pressing. The method for processing a barrel terminal according to claim 30.

38. After step S50, the method further includes step S59 of pressing or roll-pressing the connection portion to reduce its diameter. The method for processing a barrel terminal according to claim 30.

39. After step S60, the method further includes step S66 of providing a plating layer at least on the contact portion and / or the connection portion. The method for processing a barrel terminal according to claim 30.

40. After step S60, the method further includes step S80 of inserting the pressed or roll-pressed cylindrical tube into an injection molding machine to injection mold a seal ring. The method for processing a barrel terminal according to claim 30.

41. After step S60, step S90 of mounting a seal ring in the first groove is further included. The method for processing a barrel terminal according to claim 30.

42. After step S60, step S100 of fitting an elastic outer fitting member into the second groove is further included. The method for processing a barrel terminal according to claim 37.

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