Relay

Abstract

The utility model relates to a relay. The relay comprises a lead-out piece, the lead-out piece comprises a first connecting part and a second connecting part which are connected, the second connecting part is used for being connected with an external component, the lead-out piece further comprises a protrusion arranged on the first connecting part, and the lead-out piece is made of a conductive material; and a terminal, one side, facing the first connecting part, of the terminal is provided with a groove, and at least part of the projection is embedded into the groove. According to the relay, the difficulty of a preparation process is reduced, the processing cost is reduced, meanwhile, the height of the terminal is not increased, the material cost of the terminal is reduced, and the electrical connection performance is improved.

Description

Technical Field

[0001] This application relates to the field of relay technology, and in particular to a relay. Background Technology

[0002] As an electronic control device, a relay has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits and is essentially an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] In relays, there are often situations where terminals need to be electrically connected to other components. For example, when used in high-current circuits, the leads of the stationary contact need to be connected to the circuit via copper busbars. Traditional relay terminals used for connecting to other components are typically threaded. However, setting up traditional relay terminals for connecting to other components is costly and difficult. Utility Model Content

[0004] Therefore, it is necessary to provide a relay that addresses the high cost and difficulty of connecting traditional relay terminals to other components.

[0005] A relay, comprising:

[0006] A lead-out component includes a first connecting portion and a second connecting portion connected to each other, the second connecting portion being used for connecting to external components, and the lead-out component further includes a protrusion disposed on the first connecting portion; the lead-out component is made of a conductive material; and...

[0007] The terminal has a groove on the side facing the first connection portion, and at least a portion of the protrusion is embedded in the groove.

[0008] The aforementioned relay utilizes a lead-out component to connect terminals to external components. The connection between the lead-out component and the terminal is achieved through the engagement of a protrusion on the lead-out component with a groove on the terminal. This simplifies the manufacturing process of creating the groove on the terminal, reduces processing costs, and does not increase the terminal height, thus lowering material costs. Furthermore, the simpler and less costly process of creating the protrusion on the lead-out component minimizes the contact area between the lead-out component and the terminal, improving electrical connection performance. Additionally, compared to using threaded holes on the terminal, the connection reliability of the protrusion and groove is less affected by high-temperature brazing processes on the terminal, further enhancing connection reliability and electrical connection performance.

[0009] In one embodiment, the protrusion has a first anti-rotation structure, and the groove has a second anti-rotation structure. The first and second anti-rotation structures cooperate to prevent the lead-out and the terminal from rotating relative to each other. The first and second anti-rotation structures can prevent the protrusion and the terminal from rotating relative to each other around the axial direction of the terminal, which helps to improve the connection reliability of the lead-out and the terminal, thereby improving the performance reliability of the relay.

[0010] In one embodiment, the side peripheral surface of the protrusion includes an arcuate surface, the first anti-rotation structure is a plane on the side peripheral surface of the protrusion connected to the arcuate surface, the inner sidewall of the groove includes an arcuate surface, the second anti-rotation structure is a plane on the inner sidewall of the groove connected to the arcuate surface, and the first anti-rotation structure and the second anti-rotation structure are opposite to and abut against each other.

[0011] In one embodiment, the surface of the first connecting portion facing the terminal abuts against the end face of the terminal, and the end face of the protrusion abuts against the bottom surface of the groove.

[0012] In one embodiment, the width of the first connecting portion is greater than the width of the second connecting portion. This increases the contact area between the lead and the terminal, enabling the first connecting portion to meet current-carrying requirements, thereby improving the electrical connection performance between the lead and the terminal. It also helps reduce the material used in the lead and increases material utilization.

[0013] In one embodiment, the projection of the terminal onto the first connecting portion falls within the first connecting portion and is recessed relative to the first connecting portion. This fully utilizes the end face area of ​​the terminal, which helps to increase the contact area between the terminal and the first connecting portion, thereby reducing the contact resistance between the lead and the terminal and improving electrical connection performance.

[0014] In one embodiment, the first connecting portion and the terminal are fixed by welding.

[0015] In one embodiment, the protrusion and the first connecting portion are an integral structure.

[0016] In one embodiment, the groove is formed on the terminal by forming or stamping;

[0017] And / or, the protrusion is formed on the first connecting part by a stamping process.

[0018] In one embodiment, at least a portion of the surface of the lead-out is plated with a conductive layer.

[0019] In one embodiment, the second connecting portion is used to connect to external components by welding; or...

[0020] The lead-out component also includes a threaded structure connected to the second connecting part. The threaded structure has threads and is used for screwing with external components. The threaded structure is less affected by processes such as high-temperature brazing of terminals, which can improve the thread installation strength of the threaded structure. This helps to increase the locking torque between the threaded structure and external components, reduce contact resistance and temperature rise, and improve electrical connection performance.

[0021] In one embodiment, when the lead-out component includes the threaded structure, the hardness of the threaded structure is greater than the hardness of the first connecting portion, the second connecting portion, and the terminal. This ensures that the material of the threaded structure is not limited by the material of the lead-out component, allowing the use of a harder material to improve the thread's strength. This increases the locking torque the thread can withstand, which in turn improves the locking strength between the threaded structure and external components, and reduces the contact resistance and temperature rise between the threaded structure and external components.

[0022] In one embodiment, the relay is suitable for high-current scenarios, where the high current is 100A or more. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the relay structure in some embodiments.

[0024] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the relay along the AA direction.

[0025] Figure 3 This is a schematic diagram of the connection between the lead-out and the terminal in some embodiments.

[0026] Figure 4 for Figure 3 The diagram shows a structural schematic of the lead-out component and terminal from another angle.

[0027] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the leads and terminals along the BB direction.

[0028] Figure 6 This is a schematic diagram of the structure of the lead-out element in some embodiments.

[0029] Figure 7 for Figure 6 The diagram shows the structure of the lead-out component from another angle.

[0030] Figure 8 This is a schematic diagram of the terminal structure in some embodiments.

[0031] Figure 9 forFigure 8 The diagram shows the structure of the terminal at another angle.

[0032] Figure 10 This is a schematic diagram of a structure in some embodiments where the lead-out part has a threaded structure.

[0033] Figure 11 for Figure 10 The diagram shows the structural schematic of the lead-out components.

[0034] Figure 12 This is a schematic diagram of the thread structure in some embodiments.

[0035] Figure label:

[0036] 10. Relay; 11. Housing; 12. Terminal; 121. Groove; 122. Second anti-rotation structure; 13. Lead-out part; 131. First connecting part; 1311. First anti-rotation structure; 132. Second connecting part; 1321. First crimping hole; 1322. Second crimping hole; 133. Protrusion; 134. Threaded structure; 1341. Threaded body; 1342. Crimping part. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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 of this application.

[0039] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0043] Please see Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 This is a schematic diagram of the structure of relay 10 in some embodiments. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the relay 10 along the AA direction. Figure 3This is a schematic diagram showing the connection between the lead-out member 13 and the terminal 12 in some embodiments. The relay 10 provided in this application includes, but is not limited to, any applicable type of relay 10 such as a high-voltage DC relay, especially a relay suitable for high-current scenarios, where high current refers to a current of 100A or more. In some embodiments, the relay 10 includes a housing 11, a terminal 12 partially exposed outside the housing 11, and a lead-out member 13 connected to the terminal 12. The lead-out member 13 is used to connect to external components to establish an electrical connection between the terminal 12 and the external components. The housing 11 can be the outer shell of the relay 10 located outside the ceramic cover. The terminal 12 includes, but is not limited to, the lead-out end of a stationary contact provided on the ceramic cover. The terminal 12 is partially exposed outside the housing 11. The lead-out member 13 can be used to connect to the copper busbar of an external circuit to facilitate connecting the terminal 12 to the external circuit.

[0044] Furthermore, combined Figure 4 and Figure 5 As shown, in some embodiments, the lead-out member 13 includes a first connecting portion 131 and a second connecting portion 132 connected together. The first connecting portion 131 and the second connecting portion 132 can be two opposite ends of the lead-out member 13. The second connecting portion 132 is used to connect with external components such as copper busbars. The lead-out member 13 also includes a protrusion 133 provided on the first connecting portion 131. The terminal 12 has a groove 121 opposite to the protrusion 133 on the side facing the first connecting portion 131. At least a portion of the protrusion 133 is embedded in the groove 121 so that the lead-out member 13 is fixed to the terminal 12. In some embodiments, the lead-out member 13 is made of a conductive material. When the first connecting portion 131 is fixed to the terminal 12 and the second connecting portion 132 is connected to external components such as copper busbars, the lead-out member 13 contacts the terminal 12 and the copper busbars to realize the electrical connection between the terminal 12 and the external components such as copper busbars.

[0045] The traditional method of setting threaded holes on terminals can lead to the terminals softening when fixed to the ceramic cover through high-temperature brazing, resulting in reduced thread strength, difficulty in meeting the locking torque requirements, and easy stripping or breakage, thus affecting the reliability of the connection.

[0046] Therefore, the relay 10, by adding a lead-out member 13 to connect the terminal 12 to external components, achieves the connection between the lead-out member 13 and the terminal 12 through the engagement of the protrusion 133 on the lead-out member 13 with the groove 121 on the terminal 12. The process of setting the groove 121 on the terminal 12 is simpler and has lower processing costs, while not increasing the height of the terminal 12, thus reducing the material cost of the terminal 12. Simultaneously, the process of setting the protrusion 133 on the lead-out member 13 is simple and has low setting costs, and it is less likely to reduce the contact area between the lead-out member 13 and the terminal 12, which is beneficial to improving electrical connection performance. Furthermore, compared to setting a threaded hole on the terminal 12, the connection reliability of the protrusion 133 and the groove 121 is less affected by processes such as high-temperature brazing of the terminal 12, which is beneficial to improving connection reliability and electrical connection performance.

[0047] In some embodiments, the materials of the lead-out member 13 and the terminal 12 include, but are not limited to, copper or copper alloys and other materials with good electrical conductivity. The specific materials can be set according to the electrical connection requirements and are not limited in this application.

[0048] Please see Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the protrusion 133 is provided with a first anti-rotation structure 1311, and the groove 121 is provided with a second anti-rotation structure 122. The first anti-rotation structure 1311 and the second anti-rotation structure 122 cooperate to prevent the lead-out member 13 and the terminal 12 from rotating relative to each other. The side peripheral surface of the protrusion 133 includes an arcuate surface. The first anti-rotation structure 1311 is a plane on the side peripheral surface of the protrusion 133 connected to the arcuate surface. The inner sidewall of the groove 121 includes an arcuate surface. The second anti-rotation structure 122 is a plane on the inner sidewall of the groove 121 connected to the arcuate surface. The arcuate surface of the protrusion 133 and the arcuate surface of the groove 121 can both be part of a cylindrical surface. The first anti-rotation structure 1311 and the second anti-rotation structure 122 are opposite to and abut against each other. The arcuate surface of the protrusion 133 and the arcuate surface of the groove 121 are opposite to and abut against each other. Therefore, the first anti-rotation structure 1311 and the second anti-rotation structure 122 can prevent the protrusion 133 and the terminal 12 from rotating relative to each other around the axial direction of the terminal 12, which helps to improve the connection reliability of the protrusion 13 and the terminal 12, thereby improving the performance reliability of the relay 10. Of course, the first anti-rotation structure 1311 and the second anti-rotation structure 122 can also be any suitable structure such as a protrusion or a slot, as long as the first anti-rotation structure 1311 and the second anti-rotation structure 122 can cooperate with each other to prevent the protrusion 13 and the terminal 12 from rotating relative to each other.

[0049] Please see again. Figure 5As shown, in some embodiments, the protrusion 133 is completely embedded in the groove 121, the surface of the first connecting portion 131 facing the terminal 12 abuts against the end face of the terminal 12, and the end face of the protrusion 133 abuts against the bottom surface of the groove 121. This effectively increases the contact area between the lead-out member 13 and the terminal 12, which helps to reduce the contact resistance between the lead-out member 13 and the terminal 12, improving connection reliability and electrical connection performance.

[0050] refer to Figure 3 As shown, in some embodiments, the lead-out member 13 can be an overall elongated sheet structure, with the width of the first connecting portion 131 being greater than the width of the second connecting portion 132. This increases the contact area between the lead-out member 13 and the terminal 12, enabling the first connecting portion 131 to meet current-carrying requirements. This improves the electrical connection performance between the lead-out member 13 and the terminal 12, while also reducing the material used in the lead-out member 13 and increasing material utilization. In other embodiments, the width of the second connecting portion 132 can also be greater than the width of the first connecting portion 131 to accommodate different connection requirements of external components.

[0051] Combination Figure 3 and Figure 5 As shown, in some embodiments, the projection of terminal 12 onto the first connecting portion 131 falls within the first connecting portion 131 and is recessed relative to the first connecting portion 131. That is, the radial dimension of terminal 12 is smaller than the radial dimension of the first connecting portion 131. This arrangement can fully utilize the end face area of ​​terminal 12, which is beneficial to increasing the contact area between terminal 12 and the first connecting portion 131, thereby reducing the contact resistance between lead-out member 13 and terminal 12 and improving electrical connection performance.

[0052] In some embodiments, the engagement of the protrusion 133 and the groove 121 primarily serves to position the lead-out member 13 and the terminal 12. The first connecting portion 131 and the terminal 12 are fixedly connected by any applicable process such as welding. For example, the side of the terminal 12 facing the first connecting portion 131 is fixed to the first connecting portion 131. The engagement of the protrusion 133 and the groove 121 helps to improve the connection reliability between the lead-out member 13 and the terminal 12. In some embodiments, the groove 121 is formed on the terminal 12 by any applicable process such as forming or stamping. The forming process of the groove 121 is simple, the forming cost is low, and it helps to reduce the material cost of the terminal 12. In some embodiments, the protrusion 133 and the first connecting portion 131 are an integral structure, which helps to simplify the setting process of the protrusion 133 and improve the setting strength of the protrusion 133 on the first connecting portion 131. In some embodiments, the protrusion 133 is formed on the first connecting portion 131 by a stamping process. Compared with the through hole provided on the first connecting portion 131, the provision of the protrusion 133 is not affected by the thickness of the lead piece. The radial dimension of the protrusion 133 can be made smaller, for example, smaller than the thickness dimension of the lead piece, which is beneficial to enable the lead piece 13 and the terminal 12 to have sufficient contact area to reduce contact resistance and improve electrical connection performance.

[0053] In some embodiments, at least a portion of the surface of the lead-out member 13 is plated with a conductive layer. For example, the outer surface of the lead-out member 13 is plated with a conductive layer such as a silver plating layer, which has stronger conductivity than the lead-out member 13 itself. This helps to further reduce the contact resistance of the electrical connection between the lead-out member 13 and the terminal 12 and the threaded structure 134, reduce the temperature rise, and improve the electrical connection performance. Simultaneously, by adding the lead-out member 13 to the relay 10 and providing a conductive layer on the lead-out member 13, the conductive layer is less susceptible to the effects of the high-temperature brazing process of the terminal 12, effectively improving the electrical connection performance. For example, the lead-out member with the conductive layer can be connected to the terminal 12 after the terminal 12 is fixed to the ceramic cover by a high-temperature brazing process, or the lead-out member 13 can be connected to the terminal 12 after the terminal 12 is fixed to the ceramic cover by a high-temperature brazing process, and then a conductive layer can be provided on the lead-out member 13.

[0054] The connection method between the second connection part 132 and external components is not limited, as long as the electrical connection performance requirements are met. (Reference) Figure 3 As shown, in some embodiments, the second connecting part 132 is a flat plate structure and is used to connect to external components by welding.

[0055] Please see Figure 10 , Figure 11 and Figure 12As shown, in some embodiments, the lead-out member 13 further includes a threaded structure 134 connected to the second connecting portion 132. The threaded structure 134 has threads and is used for screwing with external components. Therefore, the threaded structure 134 is less susceptible to the effects of high-temperature brazing or other processes on the terminal 12, which improves the thread installation strength of the threaded structure 134. This, in turn, helps to increase the locking torque between the threaded structure 134 and external components, reduces contact resistance and temperature rise, and improves electrical connection performance. For example, during the fabrication of the relay 10, the terminal 12 can be first fixed to components such as a ceramic cover using high-temperature brazing or other processes, and then the lead-out member 13 and the threaded structure 134 can be integrally fixed to the terminal 12, effectively avoiding the influence of high-temperature brazing on the threaded structure 134. Of course, even if the lead-out piece 13 and the threaded structure 134 are first fixed to the terminal 12 as a whole, and then the terminal 12 is fixed to the carrier such as the ceramic cover through high-temperature brazing or other processes, the impact of the high temperature during the fixing of the terminal 12 on the threaded structure 134 can be reduced because the threaded structure 134 is spaced apart from the terminal 12 by the lead-out piece 13. At the same time, the setting of the threaded structure 134 is not limited by the height of the terminal 12 or the thickness of the lead-out piece 13, which is conducive to providing a sufficient number of threads to improve the locking strength. It is also not limited by the shape of the terminal 12. Compared with setting threads on the terminal 12, the process is less difficult and it is easier to form a standard part. In addition, while providing a sufficient number of threads, it is not easy to increase the thickness of the lead-out piece 13, which is conducive to reducing the space occupied and cost.

[0056] The connection method between the threaded structure 134 and the lead-out member 13 is not limited. In some embodiments, the threaded structure 134 is set on the lead-out member 13 by crimping or riveting, which not only improves the connection strength between the threaded structure 134 and the lead-out member 13, but also simplifies the assembly process of the threaded structure 134 and reduces the manufacturing cost. For example, the threaded structure 134 includes a threaded body 1341 and a crimping part 1342. The thread is provided on the threaded body 1341, and the crimping part 1342 is provided on the peripheral side of the threaded body 1341 and surrounds the threaded body 1341. The second connecting part 132 of the lead-out member 13 is provided with a crimping hole. The crimping hole has a first crimping hole 1321 and a second crimping hole 1322 that are connected in the thickness direction of the lead-out member 13. The diameter of the second crimping hole 1322 is larger than the diameter of the first crimping hole 1321. When the threaded structure 134 is attached to the lead-out member 13, the threaded body 1341 is inserted into the first crimping hole 1321 and the second crimping hole 1322. The crimping part 1342 is located in the second crimping hole 1322 and is tightly fitted to the hole wall of the second crimping hole 1322. By applying pressure to the lead-out member 13 and the threaded structure 134, the crimping part 1342 is combined with the lead-out member 13 to achieve a fixed connection between the threaded structure 134 and the lead-out member 13. The crimping part 1342 may be provided with knurled teeth or knurled structure to increase the friction and engagement force between the crimping part 1342 and the lead-out member 13, thereby improving the connection stability between the threaded structure 134 and the lead-out member 13.

[0057] The specific structural configuration of the threaded structure 134 is not limited, as long as it can be screwed into external components. In the embodiment shown in the accompanying drawings, the threaded structure 134 is a nut, and the threaded structure 134 has a threaded hole. The inner wall of the threaded structure 134 corresponding to the threaded hole has an internal thread. External components such as copper busbars can have holes, and the threaded structure 134 is screwed into the through hole and the threaded hole of the threaded structure 134 to achieve the screwing connection between the threaded structure 134 and the external components. In other embodiments, the threaded structure 134 can also be a stud, and the side circumferential surface of the threaded structure 134 has an external thread. External components such as copper busbars can have nuts, and the connection between the threaded structure 134 and the external components is achieved by screwing the threaded structure 134 into the nut of the external components.

[0058] In some embodiments, the hardness of the threaded structure 134 is greater than that of the lead-out member 13 and the terminal 12. For example, the lead-out member 13 and the terminal 12 can be made of copper, which has high conductivity, while the threaded structure 134 can be made of a material with higher hardness, such as steel. Therefore, by providing the lead-out member 13 and the threaded structure 134, the material of the threaded structure 134 used for setting the threads is not limited to the material of the lead-out member 13. A material with higher hardness can be used to set the threads to improve the setting strength of the threads, thereby increasing the locking torque that the threads can withstand. This is beneficial for improving the locking strength between the threaded structure 134 and external components, reducing the contact resistance and temperature rise between the threaded structure 134 and external components. At the same time, the lead-out member 13 and the terminal 12 can be made of highly conductive materials such as copper to meet high conductivity requirements, which is beneficial for balancing electrical connection performance and structural reliability.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A relay characterized by comprising: The utility model relates to a relay, comprising: a lead-out piece, comprising a first connecting part and a second connecting part connected to each other, the second connecting part being used for connecting to external components, the lead-out piece further comprising a convex boss provided on the first connecting part, the lead-out piece being made of conductive material; and a terminal, the terminal being provided with a groove on the side facing the first connecting part, at least part of the convex boss being embedded in the groove.

2. The relay according to claim 1, characterized in that The convex boss is provided with a first anti-rotation structure, and the groove is provided with a second anti-rotation structure, the first anti-rotation structure and the second anti-rotation structure being matched to prevent the lead-out piece and the terminal from rotating relative to each other.

3. The relay according to claim 2, characterized in that The side peripheral surface of the convex boss comprises an arc surface, the first anti-rotation structure being a flat surface connected to the arc surface on the side peripheral surface of the convex boss, the inner side wall of the groove comprising an arc surface, the second anti-rotation structure being a flat surface connected to the arc surface on the inner side wall of the groove, the first anti-rotation structure and the second anti-rotation structure being opposite to each other and abutting against each other.

4. The relay of claim 1, wherein The surface of the first connecting part facing the terminal abuts against the end surface of the terminal, and the end surface of the convex boss abuts against the groove bottom surface of the groove.

5. The relay of claim 1, wherein The width of the first connecting part is greater than the width of the second connecting part.

6. The relay of claim 1, wherein The projection of the terminal on the first connecting part falls within the first connecting part and is recessed relative to the first connecting part.

7. The relay of claim 1, wherein The first connecting part and the terminal are fixed by welding.

8. The relay of claim 1, wherein The convex boss and the first connecting part are of an integral structure.

9. The relay according to claim 8, characterized in that The groove is formed on the terminal by stamping or stamping and forming; and / or The convex boss is formed on the first connecting part by a stamping process.

10. The relay of claim 1, wherein At least part of the surface of the lead-out piece is plated with a conductive layer.

11. The relay of claim 1, wherein The second connecting part is used for connecting to external components by welding; or The lead-out piece further comprises a threaded structure connected to the second connecting part, the threaded structure being provided with threads, and the threaded structure being used for screwing with external components.

12. The relay of claim 11, wherein, When the lead-out piece comprises the threaded structure, the hardness of the threaded structure is greater than the hardness of the first connecting part, the second connecting part and the terminal.

13. The relay of claim 1, wherein The relay is suitable for a large current scenario, and the large current is a current of 100 A or more.

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