Composite terminal and terminal assembly

Abstract

The invention discloses a composite terminal and a terminal assembly. The composite terminal comprises a connecting part, a transition part and a plug-in part which are connected in sequence. The plug-in part is provided with a first contact group and a second contact group which are symmetrically arranged up and down. The terminal is formed by bending a prefabricated terminal, a contact material sheet of the terminal comprises a first forming unit and a second forming unit which are connected, the first forming unit and the second forming unit are respectively bent into a U shape and an inverted U shape to form an upper contact elastic sheet and a lower contact elastic sheet, and a material belt seam is converged on the left side wall of the plug-in part. The structure enables the upper contact group and the lower contact group to be symmetrical about the side wall, balanced forward contact pressure can be applied to the insertion piece, eccentric wear and early failure are avoided, the plugging hand feeling is improved, and the service life is prolonged; and meanwhile, the stability of a current path is ensured, the contact resistance and the overheating risk are reduced, the current-carrying and signal transmission reliability is improved, and micro motion is effectively inhibited in a vibration environment. The terminal assembly comprises the composite terminal and a metal shell for accommodating the composite terminal.

Description

Technical Field

[0001] This invention relates to the field of connectors, and more particularly to a composite terminal and a terminal assembly. Background Technology

[0002] Electrical connectors are widely used in various electrical and electronic devices to enable pluggable connections between circuits. One of their core components is the terminal block, especially the female terminal block used to mate with plate-shaped conductive components (such as plug-in blocks and knife switches). These terminals typically require stable contact pressure, reliable clamping force, and a long mechanical life.

[0003] Currently, a common type of board-to-board terminal block is integrally formed from a sheet metal body through stamping and bending processes. Its structure generally includes a connector for connecting external wires and a housing for accommodating and holding male connector pins. Chinese utility model patent CN2118829288U discloses a terminal block and its assembly, wherein the terminal block is formed by stamping and bending a sheet metal body. The housing consists of an axial limiting part, a support ring part, and an elastic contact arm part connected sequentially from left to right. The elastic contact arm part includes an elastic contact arm. The elastic contact arms extend to the right from the right side wall of the support ring, and there are multiple elastic contact arms evenly distributed around the perimeter of the support ring, resulting in a pair of vertically symmetrical elastic contact arms and a pair of horizontally symmetrical elastic contact arms. To ensure the consistency of the displacement movement of each elastic contact arm, the upper elastic contact arm and the left elastic contact arm, and the lower elastic contact arm and the right elastic contact arm are connected by corresponding connecting arms to form an independent conductive part, so that they can support and rely on each other during actual use. However, this type of terminal can only be used to receive "pin-shaped" male terminals, and because the connecting arms are located at the upper right and lower left corners, while there are no connecting arms at the upper left and lower right corners, the overall force distribution during insertion is not uniform, and the positive force of each elastic contact arm is insufficient. Summary of the Invention

[0004] To address the above problems, the present invention proposes a composite terminal and a terminal assembly.

[0005] The main contents of this invention include: A composite terminal includes a connecting portion, a transition portion, and a mating portion arranged sequentially; the mating portion includes a first contact group and a second contact group arranged vertically; the first contact group includes two first contact springs arranged symmetrically, and the second contact group includes two second contact springs arranged symmetrically; the mating portion includes an upper sidewall and a lower sidewall arranged opposite to each other, as well as a left sidewall and a right sidewall arranged opposite to each other. The composite terminal is made from a strip-shaped prefabricated terminal by a bending process; the prefabricated terminal includes a prefabricated strip formed along a continuous mold and a terminal body disposed on one side of the prefabricated strip; the terminal body includes a connecting sheet, a transition sheet and a contact sheet in sequence along a first direction; The contact sheet includes a first forming unit and a second forming unit arranged along a second direction; the first forming unit is connected to one side of the transition sheet, and the second forming unit is partially connected to one side of the first forming unit; the first forming unit has two symmetrically arranged first elastic arms, and the second forming unit has two symmetrically arranged second elastic arms. The first forming unit is bent into a "U" shape, and the second forming unit is bent into an inverted "U" shape; the two first elastic arms are stamped and stretched to form the first contact spring sheet, and the two second elastic arms are stamped and stretched to form the second contact spring sheet; the seams of the first and last ends of the contact sheet converge on the left side wall of the interlocking part.

[0006] Preferably, the first molding unit includes a first main body segment extending from the transition sheet along a first direction and a first contact segment; the second molding unit includes a second main body segment extending along the first direction and a second contact segment; the first main body segment of the first molding unit is connected to the second main body segment of the second molding unit; the first contact segment and the second contact segment are respectively used to mold the first elastic arm and the second elastic arm, and a spacer groove is provided between the first contact segment and the second contact segment.

[0007] Preferably, a central groove and symmetrically arranged bending grooves are formed in the middle of the first contact segment and the second contact segment; the central groove is formed by extending the outer end face of the first contact segment and the second contact segment along a first direction; the bending groove of the first contact segment divides the first contact segment into a first elastic arm and a first connecting arm; the bending groove of the second contact segment divides the second contact segment into a second elastic arm and a second connecting arm. The first contact segment and the second contact segment are bent into shape along the straight line containing the central axis of the bending groove.

[0008] Preferably, the head of the first spring arm and the head of the first connecting arm, as well as the head of the second spring arm and the head of the second connecting arm, are connected by a reinforcing arm.

[0009] Preferably, the bottom edges of the first and second main body segments are formed with reinforcing protrusions.

[0010] Preferably, the second main body segment has two riveting grooves, which are located at the edge of the upper sidewall of the contact portion.

[0011] Preferably, both the first and second contact springs have inwardly protruding contact protrusions; the contact protrusions are hyperboloidal in shape.

[0012] The present invention also proposes a terminal assembly, including a metal housing and an inner terminal, wherein the inner terminal is the aforementioned composite terminal; the metal housing has a receiving cavity with openings at both ends; and the mating portion is disposed within the receiving cavity.

[0013] Preferably, the metal housing includes a left side wall and a right side wall opposite to each other, and an upper side wall and a lower side wall opposite to each other; the front ends of the left side wall and the right side wall are bent in the opposite direction to form U-shaped blocking plates, and the heads of the first contact spring and the second contact spring are limited by the blocking plates. And / or a U-shaped riveting portion is provided extending from the rear of the metal housing, and riveting tabs for riveting with the inner terminal are formed on both sides of the opening of the riveting portion.

[0014] Preferably, spring-loaded windows are provided on the left and right sides of the housing, and a locking spring is provided on the front side of the spring-loaded window extending rearward along the first direction; protective plates extending outward are provided on the upper and lower sides of the spring-loaded window, and the protective plates at least partially cover the locking spring.

[0015] Compared to existing technologies, the composite terminal and terminal assembly proposed in this invention offer the following advantages: The composite terminal and terminal assembly provided by this invention, through the structural design and bending process of the prefabricated strip, converge the strip seams of the contact pieces onto the left side wall of the insertion portion. This ensures that the first and second contact groups, symmetrically arranged vertically, are symmetrical about the longitudinal plane containing the seam. Based on this, not only can the uniform positive contact pressure applied by each contact spring to the inserted plate-like or needle-like component be guaranteed, avoiding uneven wear and premature failure caused by excessive pressure on one side, but the consistency and smoothness of the insertion and removal feel are also significantly improved. Furthermore, the symmetrical and balanced double-sided contact ensures the stability of the current path, resulting in lower and more uniform contact resistance, thereby improving current carrying capacity and signal transmission reliability, and reducing the risk of localized overheating. In addition, the uniform positive force ensures uniform wear, extending the terminal contact life. In a vibration environment, the balanced clamping force effectively suppresses the micro-movements of the connected components, maintaining the stability of the contact interface. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the composite terminal of the present invention; Figure 2 This is a schematic diagram of the structure of the prefabricated terminal of the present invention; Figure 3 This is a schematic diagram of the composite terminal of the present invention from another perspective; Figure 4 This is a structural schematic diagram of the comparative design of the composite terminal of the present invention; Figure 5 Simulation results of the positive force during the insertion and removal process of the composite terminal of the present invention for comparison design; Figure 6 The simulation results show the positive force during the insertion and removal process of the composite terminal of the present invention. Figure 7 The simulation results show the total deformation of the composite terminal of the present invention in comparison design. Figure 8 The simulation results show the total deformation of the composite terminal of this invention. Figure 9 Simulation results of stress variation for the comparative design of the composite terminal of the present invention; Figure 10 The simulation results show the stress variation of the composite terminal of the present invention. Figure 11 This is a schematic diagram of the overall structure of the terminal assembly of the present invention; Figure 12 This is an exploded view of the terminal assembly of the present invention; Figure label: 1-Composite terminal; 11-Connecting part; 12-Transition part; 13-Mating part; 130-Seam; 13a-First contact group; 13b-Second contact group; 130-1-Upper side wall; 130-2-Lower side wall; 130-3-Left side wall; 130-4-Right side wall; 131-First contact spring; 1310-Contact protrusion; 132-Second contact spring; 2-Metal casing; 20-Receiving cavity; 200-Spring window; 20-1-Left side wall of casing; 20-2-Right side wall of casing; 20-3-Upper side wall of casing; 20-4-Lower side wall of casing; 21-Shielding plate; 22-Riveting part; 220-Riveting piece; 23-Locking spring; 24-Protective piece; 3-Pre-fabricated terminal; 30-Pre-fabricated strip; 31-Connecting piece; 32-Transition piece; 33-Contact piece; 33a-First forming unit; 33b-Second forming unit; 330-Spacer groove; 331-First main body section; 3310-Center groove; 332-First contact section; 3320-Bending groove; 3321-First spring arm; 3322-First connecting arm; 333-Second main body section; 3330-Reinforcing arm; 334-Second contact section; 3341-Second spring arm; 3342-Second connecting arm; 335-Reinforcing protrusion; 336-Riveting groove. Detailed Implementation

[0017] The technical solution protected by this invention will be described in detail below with reference to the accompanying drawings.

[0018] This invention proposes a composite terminal and terminal assembly. The composite terminal is compatible with both pin-shaped and plate-shaped male terminals. Unlike existing multiple contact springs evenly distributed along the circumference, it uses two sets of contact springs arranged vertically, with balanced positive forces between the two sets. This not only ensures reliable contact with the male terminal but also avoids the problem of reduced service life due to wear caused by excessive contact of one set of contact springs.

[0019] To ensure a balance of positive forces between the two sets of contact springs, this invention improves the stamping and bending structure of the composite terminal. Specifically, as shown in... Figure 1 As shown, the composite terminal includes a connecting part 11, a transition part 12, and a mating part 13 arranged sequentially. The mating part 13 has an approximately square structure. The composite terminal of the present invention also has a sheet-like metal material that is stamped and bent to form a frame structure after bending. After bending, the joint of the mating part is located on its left side wall, that is, between two sets of contact springs on one side. This means that the prefabricated terminal used to form the composite terminal 2 is formed by an asymmetric stamping and bending process. Through this design, the mechanical imbalance problem caused by the joint position of traditional terminals can be solved from the structural root, providing a guarantee for positive contact pressure balance and structural stress optimization.

[0020] To verify the superiority of this design, we used a traditional symmetrical stamping and bending terminal with a joint located on the upper sidewall as a comparative design (as shown in Figure 4). We conducted comparative experiments focusing on three key performance indicators: positive force distribution, total deformation, and stress variation. All experimental data were obtained through finite element simulation analysis, and the results are as follows: (I) Comparison of positive force distribution Positive force is a core indicator of terminal contact reliability, directly affecting insertion and removal feel, contact stability, and wear uniformity.

[0021] As shown in Figure 5, the seam in the comparative design is located on the upper sidewall. During insertion and extraction, the positive forces of the upper and lower sets of contact springs differ significantly. The positive force of the upper spring is only 0.4N, while the positive force of the lower spring is as high as 1.6N, a difference of 1.2N, indicating a severe imbalance. This phenomenon stems from the seam disrupting the material continuity and structural stiffness of the upper sidewall, resulting in insufficient elastic recovery force of the upper contact spring group, while the lower seamless area has higher stiffness, thus causing an imbalance in the clamping force.

[0022] The design of this invention places the seam on the left side wall, as shown in Figure 6. This ensures that the positive force of the upper and lower sets of contact springs is balanced and stable, with the positive force (NF) at each contact point remaining stable between 1.60 and 1.70 N, and the deviation between sets being less than 0.1 N. The seam layout on the left side wall does not affect the structural symmetry and stiffness consistency of the upper and lower contact spring sets, resulting in uniform clamping force on the insert and effectively avoiding unilateral wear and poor contact problems.

[0023] (II) Comparison of total deformation The total deformation reflects the structural stability of the terminal under stress and needs to be controlled within a reasonable range to ensure smooth insertion and removal and fitting accuracy.

[0024] As shown in Figure 7, the maximum total deformation of the comparative design is 0.14276mm, and the deformation is concentrated in the upper spring area where the joint is located. Uneven local deformation may cause the insert to shift, affecting the insertion and removal feel.

[0025] As shown in Figure 8, the maximum total deformation of this invention is 0.14514 mm, which is close to the value of the comparative design. Furthermore, the deformation is evenly distributed throughout the mating section, without any localized excessive deformation. This result demonstrates that this design optimizes the joint position without compromising the overall structural stability, fully meeting the deformation requirements for terminal assembly and use.

[0026] (III) Comparison of Stress Changes Equivalent stress distribution is directly related to the durability and fatigue life of the terminal structure. Stress concentration areas are prone to fatigue cracks or plastic deformation, leading to premature terminal failure.

[0027] As shown in Figure 9, the maximum equivalent stress of the comparative design reaches 486.22 MPa, with stress concentrated around the joint and at the root of the spring, approaching the allowable stress limit of 550~650 MPa for the terminal material, indicating a high risk of fatigue failure under long-term use.

[0028] As shown in Figure 10, the maximum equivalent stress of this invention is reduced to 423.71 MPa, a decrease of approximately 12.9% compared to the comparative design. Furthermore, the stress is evenly distributed across the upper and lower contact springs and the sidewalls of the insertion portion, without any obvious concentration areas. This optimization stems from the fact that the left side wall joint does not interfere with the force transmission path of the upper and lower springs, resulting in a more rational structural mechanical distribution and significantly improving the fatigue life and reliability of the terminals.

[0029] As can be seen from the above comparative experiments, the design of the present invention achieves a balanced distribution of positive force while ensuring that the total deformation meets the usage requirements. At the same time, it reduces the maximum stress and optimizes the stress distribution, and its overall performance far exceeds that of the traditional comparative design.

[0030] Typically, when molding the interlocking portion of two sets of contact springs positioned vertically, the seam is usually placed directly on a major surface of the molded interlocking opening, such as the upper or lower surface, for ease of mold design and production. This design simplifies the manufacturing process. However, due to the presence of the seam, the material continuity, geometry, and local stiffness at that point differ from the seamless sidewall on the opposite side. This directly leads to an imbalance in the mechanical system formed by the upper and lower sets of elastic contact arms: the structural integrity of the elastic contact arm group located on the side where the seam is located (e.g., the upper group) is weakened by the seam process, and its effective stiffness and the elastic restoring force it can provide are often less than those of the seamless elastic contact arm group on the opposite side (e.g., the lower group). Therefore, after the plate-shaped pin is inserted, the actual positive contact pressure applied to the upper and lower sides is not equal.

[0031] This imbalance of positive force leads to a series of problems: First, during prolonged insertion and removal or continuous operation, the contact protrusions on the side with greater positive force wear off significantly faster than on the other side, accelerating the degradation of contact performance. Second, uneven distribution of contact resistance on both sides may cause localized overheating, affecting electrical safety and signal transmission stability. Third, in vibrating environments, the imbalance of clamping force may exacerbate the fretting of the plate-shaped pins, further deteriorating the contact interface. Ultimately, this structural asymmetry caused by manufacturing convenience restricts further improvements in the overall contact reliability, durability, and electrical performance of the terminals.

[0032] This invention, while being compatible with both pin-shaped and plate-shaped male terminals, further improves the overall contact reliability and service life. The molding method of this composite terminal will be described in detail below: The composite terminal 1 of the present invention is integrally formed from a strip-shaped prefabricated terminal 3 by continuous die stamping and bending processes, as shown in Figure 2. The prefabricated terminal 3 includes a prefabricated strip 30 formed along the continuous die and a terminal body integrally formed on one side of the prefabricated strip 30. The terminal body is divided into a connecting piece 31, a transition piece 32 and a contact piece 33 along the first direction (length direction), corresponding to the connecting part 11, the transition part 12 and the mating part 13 of the composite terminal after forming, respectively. Among them, the contact piece 33 is the core structure for realizing asymmetric bending forming. It is divided into a first forming unit 33a and a second forming unit 33b along the second direction (width direction). The two are partially overlapped and connected, and a spacer groove 330 is reserved to avoid mutual interference during bending, while ensuring the consistency of the left and right walls of the mating part after forming. That is, the spacer groove 330 corresponds to the gap between the first contact spring 131 and the second contact spring 132 on the upper and lower sides of the left wall of the mating part.

[0033] Specifically, the first forming unit 33a is connected to one side of the transition sheet 32, and two symmetrical first elastic arms 3321 are formed on it. After bending, they are formed into a "U" shape to form the upper first contact group 13a of the insertion part 13. After the two first elastic arms 3321 are formed into contact protrusions 1310 by stamping and stretching, two first contact springs 131 can be obtained.

[0034] The second forming unit 33b is partially connected to one side of the first forming unit 33a. Two symmetrical second elastic arms 3341 are formed on it. After bending, they are inverted "U" shape to form the lower second contact group 13b of the insertion part 13. After the two second elastic arms 3341 are stamped and stretched to form corresponding contact protrusions 1310, two second contact springs 132 can be obtained.

[0035] During the bending process, the first and last ends of the contact sheet 33 naturally align, and the joint 130 converges at the left side wall 130-3, ultimately forming a symmetrical and closed interlocking cavity that can meet the requirements of total deformation and stress change without welding.

[0036] To further enhance structural strength and elasticity, a central groove 3310 is formed in the middle of both the first contact section 332 and the second contact section 334. The first contact segment 332 and the second contact segment 334 each have a central groove 3310 and symmetrically arranged bending grooves 3320 on both sides of the central groove 3310. The central groove 3310 is formed by extending the outer end face of the first contact segment 332 and the second contact segment 334 along a first direction. The bending groove 3320 of the first contact segment 332 divides the first contact segment 332 into a first elastic arm 3321 and a first connecting arm 3322. The bending groove 3320 of the second contact segment 334 divides the second contact segment 334 into a second elastic arm 3341 and a second connecting arm 3342. The insertion part 13 can be formed by bending the first contact segment 332 and the second contact segment 334 along the straight line where the central axis of the two bending grooves 3320 is located.

[0037] Meanwhile, the heads of the first spring arm 3321 and the first connecting arm 3322, and the second spring arm 3341 and the second connecting arm 3342 are connected by reinforcing arms 3330, which improves the structural strength of the spring arm heads and avoids local breakage during insertion and removal. Reinforcing protrusions 335 are formed on both sides of the bottom surface of the first main body section 331 and the second main body section 333 to enhance the rigidity of the insertion part sidewall and prevent deformation over long-term use.

[0038] In one embodiment, such as Figure 3 As shown, both the first contact spring 131 and the second contact spring 132 are provided with hyperboloid-shaped contact protrusions 1310, which reduce the contact area, increase the contact pressure, and reduce the contact resistance; at the same time, the transition part adopts a "necked" structure to maximize the cross-sectional area of ​​the terminal and improve the current carrying capacity of the terminal.

[0039] like Figure 11 and Figure 12 As shown, the present invention also proposes a terminal assembly, which is assembled from the aforementioned composite terminal 1 and a metal housing 2. The metal housing 2 provides mechanical protection, electromagnetic shielding, and precise positioning for the composite terminal. Specifically, the metal housing 2 is manufactured using a stamping and bending integrated forming process, and has an overall rectangular cavity structure with openings at both ends. It includes a left side wall 20-1, a right side wall 20-2, an upper side wall 20-3, and a lower side wall 20-4, forming an internal receiving cavity 20 for accommodating the composite terminal insertion portion 13. To adapt to the assembly of the composite terminal and improve the reliability of the assembly, the front ends of the left side wall 20-1 and the right side wall 20-2 of the housing are bent in the opposite direction to form U-shaped shielding pieces 21, which limit the heads of the first contact spring 131 and the second contact spring 132 to prevent excessive deformation of the springs or damage from external collisions.

[0040] Furthermore, a U-shaped riveting part 22 is extended behind the metal housing 2, with riveting pieces 220 formed on both sides of its opening, which are precisely matched with the riveting groove 336 on the second main body section 333 of the composite terminal. The metal housing and the composite terminal are fixedly connected through the riveting process, ensuring that their relative positions are stable in a vibration environment. Furthermore, spring-loaded windows 200 are provided on the left side wall 20-1 and right side wall 20-2 of the housing. A locking spring 23 extends along the first direction on the front side of the window to form a snap-lock with the outer plastic housing to prevent accidental dislodgement. That is, a corresponding snap-fit ​​step is provided on the inner wall of the outer plastic housing. When the metal housing 1 is inserted into the plastic housing from the rear, the end of the locking spring 23 abuts against the snap-fit ​​step to prevent the metal housing from being removed from the plastic housing. In addition, protective plates 24 extending outward are provided on the upper and lower sides of the spring-loaded window 200 to partially block the locking spring 23 and prevent accidental contact or collision that could cause the locking to fail.

[0041] During actual assembly, the mating portion 13 of the composite terminal 1 is inserted into the rear opening of the receiving cavity 20 of the metal housing 2, ensuring that the riveting groove 336 is aligned with the riveting piece 220 and the contact spring head is in contact with the shielding piece 21; pressure is applied to the riveting piece 220 to bend and press it along the riveting groove 336, thereby achieving mechanical fixation between the metal housing and the composite terminal; after assembly, the connecting portion 11 of the composite terminal is exposed at the rear end of the metal housing for connection with external wires or circuit boards; the mating portion 13 is completely housed within the receiving cavity 20, and the locking spring 23 is exposed at the spring window 200, providing the function of docking and locking with external connectors.

[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A composite terminal characterized by comprising: The composite terminal comprises a connecting portion, a transition portion and a mating portion arranged in sequence; the mating portion comprises a first contact group and a second contact group arranged in an up-down manner; the first contact group comprises two first contact springs arranged in a symmetrical manner; the second contact group comprises two second contact springs arranged in a symmetrical manner; the mating portion comprises an upper side wall and a lower side wall arranged in a facing manner and a left side wall and a right side wall arranged in a facing manner; The composite terminal is made of a preformed terminal in a strip shape through a bending process; the preformed terminal comprises a preformed strip formed in a continuous mold and a terminal body arranged on one side of the preformed strip; the terminal body comprises a connecting strip, a transition strip and a contact strip in sequence along a first direction; The contact strip comprises a first forming unit and a second forming unit arranged in a second direction; the first forming unit is connected on one side of the transition strip, and the second forming unit is partially connected on one side of the first forming unit; two first spring arms are formed on the first forming unit in a symmetrical manner, and two second spring arms are formed on the second forming unit in a symmetrical manner; The first forming unit is bent into a "U" shape, and the second forming unit is bent into an inverted "U" shape; the two first spring arms are formed into the first contact spring through stamping and stretching, and the two second spring arms are formed into the second contact spring through stamping and stretching; the joints of the leading end and the tail end of the contact strip converge at the left side wall of the mating portion.

2. The composite terminal of claim 1, wherein The first forming unit comprises a first main body segment and a first contact segment extended from the transition strip along a first direction; the second forming unit comprises a second main body segment and a second contact segment extended along a first direction; the first main body segment of the first forming unit is connected with the second main body segment of the second forming unit; the first contact segment and the second contact segment are respectively used for forming the first spring arm and the second spring arm, and a spacing groove is arranged between the first contact segment and the second contact segment.

3. A composite terminal according to claim 2, wherein The central part of the first contact segment and the second contact segment is provided with a central groove and a bending groove arranged in a symmetrical manner on both sides of the central groove; the central groove is formed by extending the outer end surface of the first contact segment and the second contact segment along a first direction; the bending groove of the first contact segment divides the first contact segment into a first spring arm and a first connecting arm; the bending groove of the second contact segment divides the second contact segment into a second spring arm and a second connecting arm; The first contact segment and the second contact segment are bent along a straight line where the central axis of the bending groove is located.

4. The composite terminal of claim 3 wherein, The head of the first spring arm and the head of the first connecting arm are connected through a reinforcing arm, and the head of the second spring arm and the head of the second connecting arm are connected through a reinforcing arm.

5. The composite terminal of claim 2 wherein, The bottom surface of the first main body segment and the second main body segment is formed with reinforcing protrusions on both side edges.

6. The composite terminal of claim 2 wherein, Two riveting grooves are arranged on the second main body segment, and the riveting grooves are located on the edge of the upper side wall of the mating portion.

7. A composite terminal according to any one of claims 1 to 6, wherein The first contact spring and the second contact spring are provided with a contact protrusion protruding inward; the contact protrusion is in a double-curved surface shape.

8. A terminal assembly characterized by, The metal shell comprises oppositely arranged shell left side wall and shell right side wall, and oppositely arranged shell upper side wall and shell lower side wall; the front end of the shell left side wall and the shell right side wall is reversely bent to form a U-shaped shielding piece, and the head of the first contact spring piece and the second contact spring piece is limited by the shielding piece.

9. A terminal assembly according to claim 8, wherein, And / or the rear of the metal shell is provided with a U-shaped riveting part, and the opening part of the riveting part is formed with a riveting piece for riveting with the inner terminal. The shell left side wall and the shell right side wall are provided with a spring piece window, the front side of the spring piece window is provided with a locking spring piece extending rearward along a first direction, the upper side and the lower side of the spring piece window are provided with outwardly extending protection pieces, and the protection pieces at least partially shield the locking spring piece.

10. A terminal assembly according to claim 8 wherein, ​

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