Connecting terminal and electric connector

By designing a multi-layer elastic arm structure for the connection terminal, the problem of insufficient elastic force in the existing technology is solved, achieving stable electrical connection and signal transmission of the PCB circuit board and extending its service life.

CN224006160UActive Publication Date: 2026-03-17DONGGUAN CHANGTONG COMM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-23
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

The existing connection terminals have insufficient elasticity, resulting in poor electrical connection stability on the PCB circuit board and affecting the stability of power and signal transmission.

Method used

Design a connection terminal including a terminal body, a first elastic arm, a second elastic arm and a third elastic arm connected in sequence. When the PCB connector is inserted, the first elastic arm begins to deform. When the connector is in place, the third elastic arm abuts against the terminal body. The first and second elastic arms deform elastically at the same time to enhance the superimposed spring-loaded clamping force and ensure a stable contact.

Benefits of technology

It improves the contact stability between the PCB connector board and the connection terminal, increases the contact pressure, ensures the stability of power and signal transmission, and extends the service life of the connection terminal, especially maintaining reliable clamping force in high-frequency vibration or temperature change environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of electric connectors, and particularly provides a connecting terminal and an electric connector, the connecting terminal comprises a terminal body, a first elastic arm, a second elastic arm and a third elastic arm which are integrally connected in sequence; the first elastic arm is provided with a body connecting end and a body far end which are oppositely arranged, the second elastic arm is provided with a first far end far away from the first elastic arm, the second elastic arm extends from the body far end in the direction close to the terminal body, and the third elastic arm extends from the first far end in the direction far away from the terminal body; the PCB plug board is inserted from the connecting end of the body to the far end of the body, when the PCB plug board is in contact with the first elastic arm, the first elastic arm starts to deform elastically, when the PCB plug board is inserted in place, the third elastic arm abuts against the terminal body, and the first elastic arm, the second elastic arm and the third elastic arm all deform elastically. And the electrical connection stability of the connection terminal and the PCB plug board is effectively improved.
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Description

Technical Field

[0001] This application relates to the field of electrical connector technology, and more particularly to a connecting terminal and an electrical connector. Background Technology

[0002] A connector is an electronic component used to connect two circuits. In use, the electrical connector is mounted on a first printed circuit board (PCB), and then a PCB connector plate from a second PCB is inserted into the connector. The two PCBs are then electrically connected via connector terminals. In practical applications, the electrical connection between the connector terminals and the PCB is typically achieved by ensuring that the distance between the connector terminals and the bottom wall of the PCB connector plate insertion cavity is less than the thickness of the PCB connector plate. When the PCB connector plate is inserted into the cavity, it presses against the connector terminals, causing elastic deformation. This elastic rebound force, combined with the bottom wall of the cavity, ensures tight contact between the PCB connector plate and the connector terminals, forming a reliable electrical connection. However, existing connectors typically use a single elastic arm design, resulting in insufficient elastic force from the elastic deformation. This leads to unstable electrical contact between the PCB connector plate and the connector terminals, affecting the stability of power and signal transmission.

[0003] Therefore, existing technologies have defects and shortcomings, and need further improvement and development. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a connection terminal and an electrical connector, which aims to solve the problem that the connection terminal in the prior art has insufficient elasticity, resulting in poor electrical connection stability with the PCB circuit board.

[0005] The technical solution adopted by this application to solve the technical problem is as follows: A connection terminal includes a terminal body, a first elastic arm, a second elastic arm, and a third elastic arm integrally connected in sequence; the first elastic arm is set at an acute angle to the terminal body, the first elastic arm has a body connection end and a body distal end disposed opposite to each other, the second elastic arm has a first distal end away from the first elastic arm, the second elastic arm extends from the body distal end in a direction toward the terminal body, and the third elastic arm extends from the first distal end in a direction away from the terminal body; a PCB connector is inserted from the body connection end to the body distal end, and when the PCB connector contacts the first elastic arm, the first elastic arm begins to elastically deform; when the PCB connector is inserted into place, the third elastic arm abuts against the terminal body, and the first elastic arm, the second elastic arm, and the third elastic arm all elastically deform.

[0006] Optionally, the second elastic arm further has a first proximal end close to the distal end of the body, and the connecting terminal further includes a contact portion located between the distal end of the body and the first proximal end. The contact portion has a contact protrusion on its surface facing away from the terminal body, and the contact protrusion has a convex bevel. The first elastic arm has a first elastic arm surface facing away from the terminal body, and the convex bevel bevel and the first elastic arm bevel form an angle of no more than 20°. Optionally, the side of the contact portion facing away from the terminal body is configured as a connecting fillet, the connecting fillet having a fillet center, the contact protrusion having a highest point, the terminal body having a vertical direction, and the projection position of the highest point of the protrusion in the vertical direction being located on the side of the first elastic arm close to the projection position of the fillet center and the vertical direction.

[0007] Optionally, the contact bump also has a bump arc surface, the bump arc surface and the bump slope form the surface of the contact bump away from the terminal body, and the first spring arm surface, the bump slope and the bump arc surface are smoothly connected in sequence.

[0008] Optionally, the edges of the first elastic arm and the contact portion on both sides of the end face away from the terminal body are provided with a chamfered structure.

[0009] Optionally, the terminal body, the first elastic arm, the second elastic arm, and the third elastic arm are sequentially connected by a circular arc transition.

[0010] Optionally, the terminal body has a snap-fit ​​fixing section, and the first elastic arm is connected to one end of the snap-fit ​​fixing section; the terminal body is also provided with an extension fixing plate, which is used to fix the snap-fit ​​fixing section to the base of the electrical connector.

[0011] Optionally, the snap-fit ​​fixing segment has a first connecting end connected to the first elastic arm, and the distance between the position of the rounded corner center projected vertically onto the snap-fit ​​fixing segment and the first connecting end is greater than the distance between the outer extension fixing plate and the first connecting end.

[0012] Optionally, the connection terminal further includes a welding fixing section, which is disposed at the end of the snap-fit ​​fixing section opposite to the first elastic arm, and is used to connect to the PCB.

[0013] Another technical solution adopted by this application to solve the technical problem is as follows: an electrical connector, which includes the connection terminals as described above.

[0014] Beneficial effects:

[0015] This application provides a connection terminal and an electrical connector. The connection terminal is provided with a first elastic arm, a second elastic arm, and a third elastic arm in sequence. When the PCB connector is inserted into the correct position, not only does the first elastic arm deform, but the second and third elastic arms also deform simultaneously. Furthermore, relying on the synergistic elastic action of the second and third elastic arms, they support each other and undergo simultaneous elastic deformation. The PCB connector gains a superimposed rebound clamping force, significantly improving the contact stability and electrical connection reliability between the PCB connector and the connection terminal. Multiple elastic deformations increase the contact pressure with the PCB connector. Simultaneously, when the PCB connector reaches the insertion end, the third elastic arm precisely abuts against the... On the terminal body, the elastic deformation of the first and second elastic arms makes the PCB connector more evenly stressed and provides additional support points. Even if the PCB connector is slightly displaced due to vibration or external force, it is difficult to detach from the reliable contact area, ensuring the stability of power and signal transmission. Furthermore, multiple elastic arms share the deformation stress and each has independent elastic recovery capability. A single elastic arm is less prone to fatigue or overload, extending the service life of the connection terminal. The superimposed elastic rebound force can maintain reliable clamping force in environments such as high-frequency vibration or large temperature changes, ensuring that the contact points of the PCB connector are stable and do not loosen, thereby effectively improving the overall transmission performance and service life of the electrical connector. Attached Figure Description

[0016] Figure 1 This is a side view of the connection terminals provided in this application;

[0017] Figure 2 This is a three-dimensional structural diagram of the connection terminal provided in this application;

[0018] Figure 3 This is a cross-sectional schematic diagram of the electrical connector provided in this application;

[0019] Figure 4 This is a cross-sectional view of the electrical connector provided in this application when a PCB connector is inserted into the connector and the PCB connector just contacts the first elastic arm of the connector terminal.

[0020] Figure 5 This is a cross-sectional view of the electrical connector provided in this application when a PCB connector is inserted into the connector and the PCB connector is already in place.

[0021] Figure 6 It is provided in this application Figure 1 Enlarged diagram of point A in the diagram;

[0022] Figure 7 This is a side view schematic diagram of the connection terminal provided in this application from another perspective;

[0023] Figure 8This is a top view of the connection terminals provided in this application;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Electrical connector; 10. Connecting terminal; 11. Terminal body; 12. First elastic arm; 13. Second elastic arm; 14. Third elastic arm; 15. Contact part; 16. Chamfered structure; 111. Snap-fit ​​fixing section; 112. Extended fixing plate; 113. First connecting end; 114. Welding fixing section; 121. Body connecting end; 122. Body distal end; 123. First elastic arm surface; 131. First distal end; 132. First proximal end; 151. Contact bulge; 152. Buzzer bevel; 153. Connecting fillet; 154. Fillet center; 155. Highest point of bulge; 156. Buzzer arc surface. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Please refer to the following: Figures 1 to 5The first embodiment of this application provides a connection terminal 10 for an electrical connector 1; the connection terminal 10 includes a terminal body 11, a first elastic arm 12, a second elastic arm 13, and a third elastic arm 14 integrally connected in sequence; the first elastic arm 12 is set at an acute angle to the terminal body 11, the first elastic arm 12 has a body connection end 121 and a body distal end 122 disposed opposite to each other, the second elastic arm 13 has a first distal end 131 away from the first elastic arm 12, the second elastic arm 13 extends from the body distal end 122 in a direction toward the terminal body 11, and the third elastic arm 14 extends from the first distal end 131 in a direction away from the terminal body 11; a PCB connector 2 is inserted from the body connection end 121 to the body distal end 122, and when the PCB connector 2 contacts the first elastic arm 12 (e.g. Figure 4 As shown in the diagram), the first elastic arm 12 begins to elastically deform when the PCB connector 2 is inserted into place (as shown in the diagram). Figure 5 As shown in the figure, the third elastic arm 14 abuts against the terminal body 11, and the first elastic arm 12, the second elastic arm 13 and the third elastic arm 14 all elastically deform.

[0030] It is known that when the PCB connector 2 is inserted into place, it not only causes the first elastic arm 12 to deform, but also causes the second elastic arm 13 and the third elastic arm 14 to deform simultaneously. Furthermore, relying on the synergistic elastic action of the second elastic arm 13 and the third elastic arm 14, they support each other and undergo simultaneous elastic deformation. The PCB connector 2 obtains a superimposed rebound clamping force, significantly improving the contact stability and electrical connection reliability between the PCB connector 2 and the connecting terminal 10. Multiple elastic deformations increase the contact pressure with the PCB connector 2. Simultaneously, when the PCB connector 2 reaches the insertion end, the third elastic arm 14 abuts against the terminal body 11, cooperating with the first elastic arm 12 and the second elastic arm 14. The elastic deformation of each of the elastic arms 13 makes the PCB connector 2 more evenly stressed and provides additional support points. Even if the PCB connector 2 is slightly displaced due to vibration or external force, it is difficult to dislodge from the reliable contact area, ensuring the stability of power and signal transmission. Furthermore, the multiple elastic arms share the deformation stress and each has independent elastic recovery capability. A single elastic arm is not prone to fatigue or overload, extending the service life of the connection terminal 10. The superimposed elastic rebound force can maintain reliable clamping force in environments such as high-frequency vibration or large temperature changes, ensuring that the contact points of the PCB connector 2 are stable and do not loosen, thereby effectively improving the overall transmission performance and service life of the electrical connector 1.

[0031] Please refer to the following: Figure 1 , Figure 2 and Figure 6In some embodiments, the second elastic arm 13 further has a first proximal end 132 close to the distal end 122 of the body. The connecting terminal 10 also includes a contact portion 15 located between the distal end 122 and the first proximal end 132. The contact portion 15 has a contact bump 151 on its surface facing away from the terminal body 11. By providing the contact bump 151, the contact strength between the connecting terminal 10 and the PCB connector 2 is further improved, reducing poor contact caused by loosening or insufficient contact area, and ensuring stable power and signal transmission. The contact bump 151 has a bump slope 152, and the first elastic arm 12 has a first elastic arm surface 123 facing away from the terminal body 11. By providing the bump slope 152 on the side of the contact portion 15 facing away from the terminal body 11, the PCB connector 2 can form a surface contact or line contact with the bump slope 152 of the contact portion 15 when inserted, thereby providing a more defined and stable pressing area between the connecting PCB connector 2 and the terminal body 11.

[0032] The inclined surface 152 of the convex bulge is set at an angle α of no more than 20° with the inclined surface of the first elastic arm. When the angle α between the inclined surface 152 of the convex bulge and the first elastic arm surface 123 is no more than 20°, the relative friction and resistance between the PCB connector 2 and the connecting terminal 10 can be significantly reduced during the insertion of the PCB connector 2 into the terminal cavity, making the insertion of the PCB connector 2 smoother. It should be noted that the insertion resistance of the PCB connector 2 is positively correlated with the angle between the inclined surface 152 of the convex bulge and the first elastic arm surface 123. On the one hand, a smaller inclination allows the PCB connector 2 to slide in and press against the contact bulge 151 more smoothly, reducing the difficulty of installation; on the other hand, the cooperation between the contact bulge 151 and the first elastic arm can also provide sufficient elastic support after the PCB connector 2 is fully inserted, preventing the PCB connector 2 from loosening or making poor contact.

[0033] Please refer to the following: Figure 6 and Figure 7In some embodiments, the side of the contact portion 15 away from the terminal body 11 is provided as a connecting rounded corner 153, the connecting rounded corner 153 has a rounded corner center 154, the contact bulge 151 has a bulge highest point 155, the terminal body 11 has a vertical direction, and the projection position of the bulge highest point 155 in the vertical direction is located on the side of the first elastic arm 12 that is close to the projection position of the rounded corner center 154 and the vertical direction. By designing a connecting rounded corner 153 on the side of the contact portion 15 away from the terminal body 11, the contact protrusion 151 is located on the connecting rounded corner 153. By controlling the projection position of the highest point 155 of the contact protrusion 151 in the vertical direction toward the first elastic arm 12, it helps to ensure that the highest point 155 of the protrusion is in close contact with the PCB connector 2 and forms an effective contact surface after the PCB connector 2 is fully inserted. This avoids contact gaps caused by the mismatch between the position of the contact protrusion 151 and the center of the rounded corner 154. It also takes into account better contact pressure and pressing area, ensuring good fit of the PCB connector 2 when close to the highest point 155 of the protrusion, thereby achieving a more reliable electrical connection.

[0034] In some embodiments, the contact bump 151 further has a bump arc surface 156, which, together with the bump slope 152, forms the surface of the contact bump 151 facing away from the terminal body 11. The first elastic arm surface 123, the bump slope 152, and the bump arc surface 156 are smoothly connected in sequence. The bump slope 152 connects to the bump arc surface 156 through a smooth transition, thereby achieving the sequential connection of the first elastic arm surface 123, the bump slope 152, and the bump arc surface 156. Through the smooth connection design, no sharp transition boundary or abrupt curve is generated between the first elastic arm surface 123 and the contact bump 151, resulting in a more uniform force distribution and elastic deformation during the insertion process. When the PCB connector 2 is inserted, the first elastic arm surface 123 first contacts the PCB connector 2, the first elastic arm 12 begins to deform elastically, and then smoothly transitions to the convex hump slope surface 152. When the PCB connector 2 is further inserted, the contact area gradually transitions to the convex hump arc surface 156. The convex hump arc surface 156 fits the PCB connector 2 through its smooth arc-shaped surface, ensuring more stable and continuous contact conductivity during use. At the same time, it can also reduce or avoid sharp corners or excessive abrupt changes at the contact convex hump 151 during the insertion process, thereby dispersing and mitigating the mechanical stress generated during the insertion process.

[0035] Please refer to the following: Figure 2In some embodiments, the edges of the first elastic arm 12 and the contact portion 15 on both sides of the end face away from the terminal body 11 are provided with chamfered structures 16. This effectively prevents the PCB connector 2 from being scratched by the sharp edges of the first elastic arm 12 and the contact portion 15 on both sides of the end face away from the terminal body 11 when it is inserted.

[0036] In some embodiments, the terminal body 11, the first elastic arm 12, the second elastic arm 13, and the third elastic arm 14 are connected by a sequential arc transition. Furthermore, to further reduce local stress concentration and improve insertion stability, this embodiment employs a sequential arc transition between the terminal body 11 and each elastic arm, as well as between each elastic arm itself. Specifically, at the end of the terminal body 11 near the first elastic arm 12, an arc-shaped transition section is provided instead of the traditional straight or sharp corner transition. By adopting an arc design in the bending area, the terminal body 11 and the first elastic arm 12 are flexibly connected. Through the arc transition between the first elastic arm 12 and the second elastic arm 13, the first elastic arm 12 and the second elastic arm 13 can work together to absorb stress when plugged in or subjected to external impact, while avoiding stress concentration caused by bends or abrupt curves, and reducing the deformation dead angle when the connecting terminal 10 is deformed, thereby helping to extend the fatigue life of the first elastic arm 12 and the second elastic arm 13. The arc transition between the second elastic arm 13 and the third elastic arm 14 takes into account that the third elastic arm 14 is usually located further out or in the functional extension part of the connecting terminal 10. In order to further improve the overall mechanical performance of the connecting terminal 10 and enhance the plugging capability of the connecting terminal 10, the arc transition can also give the third elastic arm 14 sufficient deformation space, and can also make it more adaptable when docking with the PCB connector board 2, reducing the risk of poor contact or scratches.

[0037] Please refer to the following: Figure 7 and Figure 8 In some embodiments, the terminal body 11 has a snap-fit ​​fixing section 111, and the first elastic arm 12 is connected to one end of the snap-fit ​​fixing section 111; the terminal body 11 is also provided with an extension fixing plate 112, which is used to fix the snap-fit ​​fixing section 111 to the base 20 of the electrical connector 1; specifically, the extension fixing plate 112 can be set on two vertical surfaces of the snap-fit ​​fixing section 111, and can cooperate with the base 20 of the electrical connector 1 to fix it during the assembly process, while ensuring the connection stability between the connection terminal 10 and the base 20.

[0038] In some embodiments, the snap-fit ​​fixing segment 111 has a first connecting end 113 connected to the first elastic arm 12. The distance L1 between the position of the rounded corner center 154 projected vertically onto the snap-fit ​​fixing segment 111 and the first connecting end 113 is greater than the distance L2 between the outer extension fixing plate 112 and the first connecting end 113. This extends the fixing distance of the connecting terminal 10 and places the fixing position closer to the bent arc. The terminal fixing plate snaps into the base 20, and the base 20 snaps and presses against the terminal fixing plate, effectively fixing the connecting terminal 10. This prevents the connecting terminal from swaying up, down, left, and right. The foremost end of the terminal fixing plate extends beyond the contact protrusion 151, effectively preventing the terminal from being scratched when inserted into the PCB board at an angle, or the connecting terminal 10 from deforming when inserted into the PCB connector plate 2.

[0039] In some embodiments, the connecting terminal 10 further includes a welding fixing section 114, which is disposed at the end of the snap-fit ​​fixing section 111 opposite to the first elastic arm 12 and is used to connect to the PCB. By providing the welding fixing section 114, the connecting terminal 10 is effectively and conveniently connected to the PCB.

[0040] Please refer to the following: Figures 3 to 5 In the second embodiment of this utility model, an electrical connector 1 is also provided, which includes the connection terminal 10 as described in the first embodiment of this application, thereby effectively ensuring the electrical connection stability between the connection terminal 10 and the PCB connector board 2; see the first embodiment of this application for details.

[0041] In summary, this application provides a connection terminal and an electrical connector. The connection terminal includes a terminal body, a first elastic arm, a second elastic arm, and a third elastic arm integrally connected in sequence. The first elastic arm is set at an acute angle to the terminal body. The first elastic arm has a body connection end and a body distal end that are disposed opposite to each other. The second elastic arm has a first distal end that is away from the first elastic arm. The second elastic arm extends from the body distal end in a direction toward the terminal body. The third elastic arm extends from the first distal end in a direction away from the terminal body. A PCB connector is inserted from the body connection end to the body distal end. When the PCB connector contacts the first elastic arm, the first elastic arm begins to elastically deform. When the PCB connector is fully inserted, the third elastic arm abuts against the terminal body. The first elastic arm, the second elastic arm, and the third elastic arm all elastically deform. The connecting terminal is equipped with a first elastic arm, a second elastic arm, and a third elastic arm in sequence. This design ensures that when the PCB connector is inserted into the correct position, not only does the first elastic arm deform, but the second and third elastic arms also deform simultaneously. Furthermore, the synergistic elastic action of the second and third elastic arms provides mutual support and simultaneous elastic deformation, resulting in a superimposed rebound clamping force on the PCB connector. This significantly improves the contact stability and electrical connection reliability between the PCB connector and the connecting terminal. The multiple elastic deformations increase the contact pressure with the PCB connector. Simultaneously, when the PCB connector reaches the insertion end, the third elastic arm abuts against the terminal body, cooperating with the first elastic arm... The elastic deformation of the elastic arm and the second elastic arm makes the PCB connector more evenly stressed and provides additional support points. Even if the PCB connector is slightly displaced due to vibration or external force, it is difficult to fall out of the reliable contact area, ensuring the stability of power and signal transmission. Furthermore, multiple elastic arms share the deformation stress and each has independent elastic recovery capabilities. A single elastic arm is less prone to fatigue or overload, extending the service life of the connection terminals. The superimposed elastic rebound force can maintain reliable clamping force in environments with high-frequency vibration or large temperature changes, ensuring that the PCB connector contact points are stable and do not loosen, thereby effectively improving the overall transmission performance and service life of the electrical connector.

[0042] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A connection terminal characterized by comprising: The connecting terminal comprises a terminal body, a first elastic arm, a second elastic arm and a third elastic arm which are integrally connected in sequence; the first elastic arm is arranged at an acute angle with the terminal body, the first elastic arm has a body connecting end and a body distal end which are arranged oppositely, the second elastic arm has a first distal end which is away from the first elastic arm, the second elastic arm is arranged to extend from the body distal end in a direction towards the terminal body, and the third elastic arm is arranged to extend from the first distal end in a direction away from the terminal body; a PCB connector is inserted from the body connecting end to the body distal end, and when the PCB connector is in contact with the first elastic arm, the first elastic arm starts to elastically deform, and when the PCB connector is inserted in place, the third elastic arm abuts against the terminal body, and the first elastic arm, the second elastic arm and the third elastic arm all elastically deform.

2. The connecting terminal according to claim 1, characterized by The second elastic arm further has a first proximal end which is close to the body distal end, the connecting terminal further comprises a contact portion which is located between the body distal end and the first proximal end, the contact portion is provided with a contact convex on a surface thereof which faces away from the terminal body, the contact convex has a convex inclined surface, the first elastic arm has a first elastic arm surface which faces away from the terminal body, and the convex inclined surface is arranged at an included angle of not greater than 20° with the first elastic arm surface.

3. The connecting terminal according to claim 2, characterized by The side of the contact portion which faces away from the terminal body is provided with a connecting fillet, the connecting fillet has a fillet center, the contact convex has a convex highest point, the terminal body has a vertical direction, and the projection position of the convex highest point in the vertical direction is located on the side of the fillet center which is close to the first elastic arm.

4. The connecting terminal according to claim 2, characterized by The contact convex further has a convex arc surface, the convex arc surface and the convex inclined surface constitute the surface of the contact convex which faces away from the terminal body, and the first elastic arm surface, the convex inclined surface and the convex arc surface are sequentially and smoothly connected.

5. The connecting terminal according to claim 2, characterized by The edges of the end surface of the first elastic arm and the contact portion which faces away from the terminal body are all provided with chamfer structures.

6. The connection terminal according to claim 1, characterized by The terminal body, the first elastic arm, the second elastic arm and the third elastic arm are sequentially and arcuately connected.

7. The connecting terminal according to claim 3, characterized by The terminal body has a clamping fixing segment, the first elastic arm is connected to one end of the clamping fixing segment, the terminal body is further provided with an extension fixing plate, and the extension fixing plate is used for fixedly connecting the clamping fixing segment to a base of an electrical connector.

8. The connecting terminal according to claim 7, characterized by The clamping fixing segment has a first connecting end which is connected to the first elastic arm, the distance between the position of the fillet center which is vertically projected on the clamping fixing segment and the first connecting end is greater than the distance between the extension fixing plate and the first connecting end.

9. The connecting terminal according to claim 7, characterized by The connecting terminal further comprises a welding fixing segment which is arranged at one end of the clamping fixing segment which faces away from the first elastic arm and is used for connecting a PCB.

10. An electrical connector, characterized by The connecting terminal comprises the connecting terminal according to any one of claims 1-9.