A connector assembly

By using a wireless connection method between the guide bar and the circuit board, the problems of space occupation and messy wiring of traditional connector components are solved, resulting in a more compact, aesthetically pleasing and reliable connector design.

CN224472741UActive Publication Date: 2026-07-07SHENZHEN POWEROAK NEWENER CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN POWEROAK NEWENER CO LTD
Filing Date
2025-07-22
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Traditional connector assembly and circuit board connection methods require additional installation space, increasing equipment size and connection costs, and are prone to messy wiring and assembly risks.

Method used

A guide rod is used instead of a cable. Wireless connection is achieved by connecting the threaded part of the guide rod to the soldering part of the connecting terminal and the circuit board. Soldering and automatic soldering equipment are used for fixation.

Benefits of technology

It reduces the design space of energy storage equipment, improves the neatness and aesthetics of the internal layout, reduces connection costs, avoids the risk of assembly line overlap, and improves assembly efficiency and reliability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The embodiment of the present application provides a kind of connector assembly.The connector assembly includes: connector body;Flow guide rod, flow guide rod includes base body part, threaded portion, welding portion and the guide portion in the shape of frustum, threaded portion and welding portion are respectively protruding in the axial direction of base body part at two ends opposite to it, and guide portion is set to the end of welding portion in the axial direction away from base body part;Connection terminal, set on connector body, connection terminal is provided with threaded structure and tin hole, and the axial direction of threaded structure and the axial direction of tin hole are orthogonal to each other;Threaded portion passes through the inside of threaded structure until tin hole;Circuit board, connection terminal is connected with circuit board by flow guide rod.The connector assembly and the wireless beam connection design of circuit board have the advantages of saving space, reducing connection cost, eliminating assembly pressure line risk and neat and beautiful layout.
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Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a connector assembly. Background Technology

[0002] In energy storage devices, traditional connector assemblies and circuit boards are typically connected by cables, i.e., electrical conduction between them is achieved through wire harnesses. However, this traditional connection method has the following significant drawbacks:

[0003] (1) Cable laying requires additional installation space, which increases the overall size of the equipment and is not conducive to compact structural design;

[0004] (2) The cable needs to be inserted into the locking hole of the connector terminal and fixed with the locking screw. This method increases the assembly process and material cost, and increases the overall connection cost.

[0005] (3) The cable connection method can easily cause messy internal wiring of the equipment, which not only affects the overall aesthetics, but may also cause risks such as wire compression and short circuit during the assembly process, reducing the reliability of the system. Utility Model Content

[0006] The connector assembly provided by this utility model aims to solve at least some of the defects of existing connector assemblies.

[0007] This utility model provides a connector assembly. The connector assembly includes:

[0008] Connector body;

[0009] A flow guide bar, comprising a base portion, a threaded portion, a welded portion, and a guide portion in the shape of a frustum. The threaded portion and the welded portion protrude from the two opposite ends of the base portion in its axial direction, and the guide portion is disposed at the end of the welded portion that is axially away from the base portion.

[0010] A connecting terminal is disposed on the connector body. The connecting terminal is provided with a threaded structure and a solder receiving hole, and the axial direction of the threaded structure is orthogonal to the axial direction of the solder receiving hole. The threaded portion passes through the interior of the threaded structure to the solder receiving hole.

[0011] The circuit board, wherein the connection terminal is connected to the circuit board via the guide rod.

[0012] In some embodiments, the base portion is provided with a flat structure at one end of its axial direction near the weld portion, and the flat structure has at least one plane in the radial direction of the base portion;

[0013] An external force is applied to the plane to cause the threaded portion to screw into or out of the threaded structure.

[0014] In some embodiments, the connector body has a base, and the base has an internal receiving space;

[0015] One end of the connection terminal abuts against the surface of the base inside the receiving space, and the other end extends out of the receiving space in a direction away from the base.

[0016] In some embodiments, the base is provided with a socket, and the location of the socket corresponds to the location of the connection terminal.

[0017] In some embodiments, the threaded structure includes:

[0018] A hollow head, the head being located at the end of the connecting terminal away from the base;

[0019] The hollow tail has one end connected to the head and the other end located inside the tin-receiving hole.

[0020] In some embodiments, an external thread is provided on the outer surface of the threaded portion, and an internal thread adapted to the external thread is provided on the inner surface of the tail portion.

[0021] When the threaded portion passes through the interior of the threaded structure to the tin-receiving hole, the external thread engages with the internal thread to fix the threaded portion to the connecting terminal.

[0022] In some embodiments, when the threaded portion passes through the interior of the threaded structure to the tin-receiving hole, a portion of the flat structure is housed inside the head, and another portion of the flat structure is located outside the head.

[0023] In some embodiments, the circuit board is provided with via pads, the guide portion is inserted into the via pads, and the soldering portion is connected to the via pads;

[0024] Solder is filled into the tin-receiving hole, and the solder can weld and fix the threaded part to the connecting terminal so that the threaded part and the connecting terminal form an electrical connection.

[0025] In some embodiments, the via pad has a shape, size, and placement position adapted to the welded portion;

[0026] When the welded part passes through the via pad, the welded part can be welded and fixed to the via pad by an automatic welding device.

[0027] In some embodiments, the guide portion has opposing first and second platforms in its axial direction, and the first platform abuts against the end face of the weld portion that is axially away from the base portion.

[0028] The first platform has a first radial dimension in the radial direction of the guide portion, and the second platform has a second radial dimension in the radial direction of the guide portion;

[0029] Wherein, the first radial dimension is larger than the second radial dimension.

[0030] The connector assembly provided in this embodiment of the invention has at least one of the following advantages: This connector assembly uses a guide bar instead of traditional cables to connect to the circuit board, achieving a wireless connection method. This design not only saves internal space in the energy storage device, helping to reduce the overall size of the device, but also improves the neatness and aesthetics of the internal layout, while effectively avoiding the risk of wire compression caused by wire harnesses during assembly. Furthermore, the guide bar can replace the locking screw structure in traditional connector assemblies, simplifying the connection process, reducing connection costs, and improving assembly efficiency and product reliability. Attached Figure Description

[0031] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0032] Figure 1 This is a schematic diagram of the connector assembly provided in an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the guide rod provided in an embodiment of the present utility model;

[0034] Figure 3 This is a schematic diagram of the connector body provided in an embodiment of the present utility model;

[0035] Figure 4 A schematic diagram of the structure of the connector assembly and panel assembly provided in the embodiment of this utility model during assembly;

[0036] Figure 5 A schematic diagram of the circuit board provided in an embodiment of this utility model;

[0037] Figure 6 A schematic diagram of the structure of the circuit board and the connector assembly mounted on the panel assembly provided in this embodiment of the utility model;

[0038] Figure 7A partial cross-sectional view of the circuit board and connector assembly provided in an embodiment of this utility model;

[0039] Figure 8 Provided for the embodiments of this utility model Figure 7 A magnified view of a portion at point A;

[0040] Figure 9 This is a schematic diagram of the structure of a traditional connector assembly;

[0041] Figure 10 This is a schematic diagram of the structure when a traditional connector assembly is connected to a traditional circuit board.

[0042] Figure label:

[0043] 100. Connector assembly; 1. Connector body; 11. Base; 111. Socket; 2. Guide bar; 21. Base part; 22. Threaded part; 23. Soldering part; 24. Guide part; 211. Flat structure; 241. First platform; 242. Second platform; 2111. Plane; 3. Connecting terminal; 31. Threaded structure; 32. Solder jack hole; 311. Head; 312. Tail;

[0044] 200. Circuit board; 2001. Via pad;

[0045] 300. Conventional connector assembly; 3001. Conventional connector body; 3002. Conventional connector terminal; 3003. Locking hole; 3004. Conventional threaded structure; 3005. Cable; 3006. Locking screw; 3007. O-type terminal; 3008. Fastening screw;

[0046] 400. Traditional circuit boards;

[0047] 500. Panel components. Detailed Implementation

[0048] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0049] It should be noted that, unless otherwise expressly specified and limited, the terms "insertion," "away from," "located in," "towards," "approaching," "inner," "outer," "axial," "radial," etc., used in this specification to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model. The terms "installation," "fitting," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixing" can be bolt fixing, snap-fit ​​fixing, or glue fixing. 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, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. "A plurality" or "several" means two or more. In addition, "and / or" includes any and all combinations of one or more of the related listed items. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] In this embodiment, the specific implementation of the "connector component" is not limited, and those skilled in the art can selectively use any suitable implementation method according to actual needs.

[0052] In the following description, such as Figures 1-7 As shown, the following situation exists: the axial direction of the base part 21, the axial direction of the threaded part 22, the axial direction of the welded part 23, the axial direction of the guide part 24, the axial direction of the threaded structure 31, the thickness direction of the circuit board 200 or the axial direction of the through-hole pad 2001, the thickness direction of the base 11 or the extension direction of the socket 111 are defined as the Z direction, the length direction of the base 11 and the length direction of the circuit board 200 are defined as the Y direction, and the width direction of the base 11 and the width direction of the circuit board 200 are defined as the X direction; wherein, the Z direction, the Y direction and the X direction are orthogonal to each other.

[0053] Please see Figure 6 and Figure 7The connector assembly 100 can be connected to a circuit board 200 having a via pad 2001, and both the connector assembly 100 and the circuit board 200 are used in energy storage devices.

[0054] Specifically, the connector assembly 100 is a socket connector, so that the user can insert the plug connector of the electrical device into the connector assembly 100 to enable the energy storage device to provide power to the electrical device.

[0055] In some embodiments, combined with Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 It is known that the connector assembly 100 includes: a connector body 1, a flow guide 2, and a connection terminal 3.

[0056] The aforementioned guide rod 2 includes: a base portion 21, a threaded portion 22, a welded portion 23, and a guide portion 24 in the shape of a frustum.

[0057] The threaded portion 22 and the welded portion 23 protrude from the two opposite ends of the base portion 21 in the Z direction, and the guide portion 24, which is shaped like a frustum, is provided at the end of the welded portion 23 that is away from the base portion 21 in the Z direction.

[0058] In addition, the connecting terminal 3 is provided on the connector body 1. The connecting terminal 3 is provided with a threaded structure 31 and a solder-receiving hole 32, and the axial direction (or Z direction) of the threaded structure 31 is orthogonal to the axial direction of the solder-receiving hole 32.

[0059] In addition, each connecting terminal 3 corresponds to a threaded structure 31 and a solder-receiving hole 32, each guide bar 2 corresponds to a threaded structure 31, and each threaded structure 31 corresponds to a solder-receiving hole 32.

[0060] It should be noted that, according to Figure 9 and Figure 10It is understood that the conventional connector assembly 300 includes a conventional connector body 3001, a conventional connecting terminal 3002, a locking hole 3003 disposed on the conventional connecting terminal 3002, a conventional threaded structure 3004, a cable 3005, and a locking screw 3006; wherein, the cable 3005 has a first end and a second end opposite to each other in its axial direction, the first end of the cable 3005 is inserted into the locking hole 3003, and the second end of the cable 3005 is fixedly connected to an O-type terminal 3007 (also called a circular terminal or ring terminal); in addition, the locking screw 3006 is inserted into the conventional threaded structure 3004 until it enters the locking hole 3003, thereby pressing the first end of the cable 3005 so that the conventional connecting terminal 3002 and the first end of the cable 3005 are electrically connected; in addition, the second end of the cable 3005 is fixed to the conventional circuit board 400 through the O-type terminal 3007 and the fastening screw 3008 so that the conventional circuit board 400 and the second end of the cable 3005 are electrically connected; therefore, the conventional connecting terminal 3002 is electrically connected to the conventional circuit board 400 through the cable 3005.

[0061] Specifically, by Figure 1 , Figure 3 , Figure 9 and Figure 10 It can be seen that the conventional connector body 3001, conventional connecting terminal 3002, locking hole 3003 and conventional thread structure 3004 provided on the conventional connecting terminal 3002 have the same structure and construction as the connector body 1, connecting terminal 3, solder jack hole 32 and thread structure 31 provided on the connecting terminal 3.

[0062] In other words, this connector assembly 100 is designed without wires based on the conventional connector body 3001 and conventional connection terminal 3002, thereby improving the shortcomings of the conventional connector assembly 300 which is connected to the conventional circuit board 400 by wires via cable 3005.

[0063] Specifically, the wire harness connection method has the following drawbacks, including but not limited to: the cable 3005 requires extra wiring space, which increases the size of the energy storage device; after the cable 3005 is inserted into the locking hole 3003, it needs to be fastened with a locking screw 3006, and it needs to be fastened to the traditional circuit board 400 through an O-type terminal 3007 and a fastening screw. Therefore, the wire harness connection method not only has a high connection cost, but also low assembly efficiency; the variety and quantity of cables 3005 lead to a messy internal layout of the energy storage device, and there is also a risk of wire compression during assembly.

[0064] In the embodiments of this application, reference is made to Figure 1 and Figure 2It is known that the threaded part 22 passes through the inside of the threaded structure 31 to the solder-receiving hole 32. At this time, the solder-receiving hole 32 is filled with solder, which can weld and fix the threaded part 22 to the connecting terminal 3 so that the threaded part 22 and the connecting terminal 3 form an electrical connection.

[0065] It should be noted that, in combination Figures 5-8 It can be seen that the guide part 24 is inserted into the via pad 2001 to guide the soldering part 23 through the via pad 2001, at which time the soldering part 23 and the via pad 2001 are electrically connected.

[0066] It is understandable that when the threaded portion 22 forms an electrical connection with the connecting terminal 3 and the soldered portion 23 forms an electrical connection with the through-hole pad 2001, the connecting terminal 3 forms an electrical connection with the circuit board 200 through the guide bar 2.

[0067] In some embodiments, please refer to Figures 1-8 The base portion 21 has a flat structure 211 at one end near the welding portion 23 in the Z direction, and the flat structure 211 has at least one plane 2111 in the radial direction of the base portion 21.

[0068] An external force is applied to the plane 2111 to cause the threaded portion 22 to screw into or out of the threaded structure 31.

[0069] In addition, the solder can weld the threaded portion 22 to the connecting terminal 3, and the flat structure 211 can facilitate the clamping of fastening tools (e.g., wrenches) to facilitate the assembly and disassembly of the guide rod 2.

[0070] Furthermore, a flat structure can be understood as a structure formed by cutting off a portion of a column or shaft in the radial direction to create a flat shape.

[0071] It should be noted that when the welding part 23 passes through the via pad 2001, the welding part 23 and the via pad 2001 can be automatically welded and fixed by an automatic welding device, thereby improving assembly efficiency.

[0072] Specifically, the connector assembly 100 uses the threaded portion 22 of the guide bar 2, the flat structure 211 provided on the base portion 21, and the solder filled in the solder jack 32 to replace the locking screw 3006 and the first end of the cable 3005. The welding portion 23 and the guide portion 24 of the guide bar 2 are used to replace the second end of the cable 3005 and the O-type terminal 3007. The welding and fixing of the welding portion 23 and the through-hole pad 2001 by an automatic welding device is used to replace the fastening screw 3008 to fasten the O-type terminal 3007 to the conventional circuit board 400. At the same time, the overall structure of the guide bar 2 is used to replace the cable 3005.

[0073] Therefore, compared with the wire harness connection method between the traditional connector assembly 300 and the traditional circuit board 400, the wireless connection method between the connector assembly 100 and the circuit board 200 has the following advantages, including but not limited to: reducing wiring space, thereby saving design space for energy storage devices, thereby reducing the size of energy storage devices, making the internal layout of energy storage devices neat and beautiful, eliminating the risk of creasing during assembly, reducing the connection cost of the connection method between the connector assembly 100 and the circuit board 200, and improving assembly efficiency.

[0074] In some embodiments, such as Figure 1 , Figure 2 and Figure 8 As shown, the guide portion 24 has a first platform 241 and a second platform 242 facing each other in the Z direction, and the first platform 241 abuts against the end face of the welding portion 23 away from the base portion 21 in the Z direction.

[0075] It is understood that the first platform 241 has a first radial dimension in the radial direction of the guide portion 24, and the second platform 242 has a second radial dimension in the radial direction of the guide portion 24.

[0076] It should be noted that the first radial dimension is larger than the second radial dimension.

[0077] In some embodiments, combined with Figure 1 and Figure 3 It can be seen that the connector body 1 has a base 11, and the base 11 has an internal accommodating space.

[0078] In this embodiment, one end of the connecting terminal 3 abuts against the surface of the base 11 inside the receiving space, and the other end extends out of the receiving space in the Z direction away from the base 11.

[0079] In some embodiments, according to Figure 3 and Figure 4 It can be seen that the base 11 has a socket 111, and the position of the socket 111 corresponds to the position of the connection terminal 3.

[0080] In some embodiments, by Figure 1 It can be seen that the thread structure 31 includes: a hollow head 311 and a hollow tail 312.

[0081] The head 311 is located at the end of the connecting terminal 3 away from the base 11.

[0082] In addition, one end of the tail 312 is connected to the head 311, and the other end of the tail 312 is located inside the tin-receiving hole 32.

[0083] In some embodiments, such as Figure 1 and Figure 2As shown, the outer surface of the threaded portion 22 is provided with an external thread, and the inner surface of the tail portion 312 is provided with an internal thread that matches the external thread.

[0084] Specifically, when the threaded portion 22 passes through the interior of the threaded structure 31 to the tin-receiving hole 32, the external thread engages with the internal thread so that the threaded portion 22 is fixedly connected to the connecting terminal 3.

[0085] In some embodiments, refer to Figure 1 and Figure 2 It can be seen that when the threaded part 22 passes through the inside of the threaded structure 31 to the tin-receiving hole 32, one part of the flat structure 211 is accommodated inside the head 311, and the other part of the flat structure 211 is located outside the head 311.

[0086] Please see Figures 1-8 The via pad 2001 has a shape, size and position adapted to the soldering part 23, so as to allow the soldering part 23 to pass through the via pad 200 of the circuit board 200.

[0087] In the embodiments of this application, such as Figures 1-7 As can be seen, each connector assembly 100 is provided with 3 connection terminals 3 as an example, and the panel assembly 500 of the energy storage device is provided with 4 connector assemblies 100 as an example; and the 3 connection terminals 3 are arranged in the Y direction and the X direction respectively to form a triangle, so the 3 sockets 111 of the base 11 are triangular (refer to a household three-prong socket).

[0088] In practical applications, combined with Figures 1-7 It is understood that the user first assembles the four connector assemblies 100 with the guide rod 2 assembled along the Y direction with the panel assembly 500. At this time, the side where the connection terminal 3 is located enters the interior of the panel assembly 500, and the insertion hole 111 of the base 11 is exposed. Then, the circuit board 200 and the welding part 23 are automatically welded and fixed by an automatic welding equipment. In this embodiment of the application, the four connector assemblies 100 have a total of 12 welding parts 23. Therefore, it is necessary to ensure that all 12 welding parts 23 can pass through the through hole pad 2001 of the circuit board 200.

[0089] To further explain, according to Figures 1-8It is known that when a large number of solder parts 23 need to pass through the via pads 2001 of the circuit board 200, the accumulation of machining tolerances and assembly tolerances between the solder parts 23 and the via pads 2001 will cause the insertion mismatch problem, resulting in the solder parts 23 not being able to pass through the via pads 2001 completely. The guide part 24, which is shaped like a truncated cone, can solve the insertion mismatch problem. The guide part 24 enters the via pads 2001 first, thereby completely guiding the solder parts 23 into the via pads 2001, and thus completing the assembly of all solder parts 23 with the via pads 2001.

[0090] In summary, the connector assembly provided by this utility model uses a guide bar instead of traditional cables to connect to the circuit board, achieving a wireless connection method. This design not only saves internal space in the energy storage device, helping to reduce the overall size of the device, but also improves the neatness and aesthetics of the internal layout, while effectively avoiding the risk of wire compression caused by wire harnesses during assembly. Furthermore, the guide bar can replace the locking screw structure in traditional connector assemblies, simplifying the connection process, reducing connection costs, and improving assembly efficiency and product reliability.

[0091] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A connector assembly characterized by, include: Connector body; A flow guide bar, comprising a base portion, a threaded portion, a welded portion, and a guide portion in the shape of a frustum. The threaded portion and the welded portion protrude from the two opposite ends of the base portion in its axial direction, and the guide portion is disposed at the end of the welded portion that is axially away from the base portion. A connecting terminal is disposed on the connector body. The connecting terminal is provided with a threaded structure and a solder receiving hole, and the axial direction of the threaded structure is orthogonal to the axial direction of the solder receiving hole. The threaded portion passes through the interior of the threaded structure to the solder receiving hole. The circuit board, wherein the connection terminal is connected to the circuit board via the guide rod.

2. The connector assembly according to claim 1, characterized in that, The base portion has a flat structure at one end near the weld portion in the axial direction, and the flat structure has at least one plane in the radial direction of the base portion; An external force is applied to the plane to cause the threaded portion to screw into or out of the threaded structure.

3. The connector assembly according to claim 2, characterized in that, The connector body has a base, and the base has an internal accommodating space; One end of the connection terminal abuts against the surface of the base inside the receiving space, and the other end extends out of the receiving space in a direction away from the base.

4. The connector assembly according to claim 3, characterized in that, The base has a socket, and the position of the socket corresponds to the position of the connection terminal.

5. The connector assembly of claim 3, wherein, The threaded structure includes: A hollow head, the head being located at the end of the connecting terminal away from the base; The hollow tail has one end connected to the head and the other end located inside the tin-receiving hole.

6. The connector assembly according to claim 5, characterized in that, The outer surface of the threaded portion is provided with an external thread, and the inner surface of the tail portion is provided with an internal thread that is compatible with the external thread. When the threaded portion passes through the interior of the threaded structure to the tin-receiving hole, the external thread engages with the internal thread to fix the threaded portion to the connecting terminal.

7. The connector assembly according to claim 5, characterized in that, When the threaded portion passes through the interior of the threaded structure to the tin-receiving hole, one part of the flat structure is accommodated inside the head, and the other part of the flat structure is located outside the head.

8. The connector assembly according to claim 1, characterized in that, The circuit board is provided with via pads, the guide portion is inserted into the via pads, and the soldering portion is connected to the via pads; Solder is filled into the tin-receiving hole, and the solder can weld and fix the threaded part to the connecting terminal so that the threaded part and the connecting terminal form an electrical connection.

9. The connector assembly according to claim 8, characterized in that, The via pad has a shape, size, and placement that are adapted to the welding portion; When the welded part passes through the via pad, the welded part can be welded and fixed to the via pad by an automatic welding device.

10. The connector assembly according to any one of claims 1-9, characterized in that, The guide portion has a first platform and a second platform opposite each other in its axial direction, and the first platform abuts against the end face of the welding portion that is axially away from the base portion. The first platform has a first radial dimension in the radial direction of the guide portion, and the second platform has a second radial dimension in the radial direction of the guide portion; Wherein, the first radial dimension is larger than the second radial dimension.