Relay static contact assembly, relay and electric equipment

Abstract

The utility model provides a relay static contact assembly, a relay and electric equipment, the relay static contact assembly comprises a static contact and a connecting piece, the hardness of the static contact is smaller than that of the connecting piece, one of the static contact and the connecting piece is provided with a first connecting part, the other one is provided with a second connecting part, and the first connecting part is in threaded connection with the second connecting part. And the first connecting part is welded with the second connecting part. According to the invention, through selecting the connecting piece whose hardness is higher than that of the static contact, the static contact assembly can bear a high torque, and when the static contact assembly is connected with a copper bar of an external circuit, the static contact assembly can have a lower contact resistance, thereby facilitating reduction of potential safety hazards during use of the relay. The static contact and the connecting piece are in threaded connection firstly, and then the connection gap between the static contact and the connecting piece is welded and filled, so that the connection stability of the static contact and the connecting piece is ensured.

Description

Technical Field

[0001] The present application relates to the technology of manufacturing electronic components, and particularly to a static contact assembly of a relay, a relay and an electrical equipment. Background Art

[0002] A relay is an electrical control device that plays roles such as automatic regulation, safety protection, and circuit conversion in a circuit. Among them, the static contact is an important part in the relay. The static contact can cooperate with the moving contact to achieve the conduction or disconnection of the circuit, and the static contact is also used to electrically connect the relay and the external circuit.

[0003] In the solutions of related technologies, the static contact of the relay is usually made of copper material to make it have good electrical conductivity. However, the hardness of copper is relatively low, so that the torque that the static contact can withstand is relatively low. When the static contact is connected to the copper bar of the external circuit, the contact force between the copper bar and the static contact assembly is relatively low, the contact resistance is relatively large, and it is easy to have high temperature or even catch fire, which poses a safety hazard. Summary of the Utility Model

[0004] In order to overcome the above defects in related technologies, the purpose of the present application is to provide a static contact assembly of a relay, a relay and an electrical equipment. The static contact assembly of the relay in the present application can withstand a relatively high torque and can have a lower contact resistance when connected to the copper bar of the external circuit, which is beneficial to reducing the safety hazard during the use of the relay.

[0005] On the one hand, the present application provides a static contact assembly of a relay, including a static contact and a connecting member. The hardness of the static contact is less than that of the connecting member. One of the static contact and the connecting member is provided with a first connecting portion, and the other is provided with a second connecting portion. The first connecting portion is threadedly connected to the second connecting portion, and the first connecting portion and the second connecting portion are welded.

[0006] In a possible implementation manner, the first connecting portion includes a connecting hole provided at the first end of the static contact, and an internal thread section is provided in the connecting hole;

[0007] The connecting member includes a bolt, and the second connecting portion includes a first external thread section provided on the bolt;

[0008] The first external thread section is threadedly connected to the internal thread section, and the first external thread section and the internal thread section are welded.

[0009] In a possible implementation manner, the connecting member further includes a second external thread section, and the second external thread section is used to connect a copper bar.

[0010] In a possible implementation, the diameter of the second external thread segment is greater than the diameter of the first external thread segment; the second connecting portion further includes a transition segment, the transition segment is arranged between the first external thread segment and the second external thread segment, and the diameter of the transition segment gradually increases from the first external thread segment to the second external thread segment;

[0011] The first connecting portion further comprises a transition hole section, the transition hole section is connected to the connecting hole, and the inner diameter of the transition hole section gradually increases in a direction away from the connecting hole;

[0012] The transition section is welded to the transition hole section.

[0013] In a possible implementation manner, a solder storage portion is formed at the bottom of the connection hole, and the solder storage portion is used to store solder.

[0014] In a possible implementation, the stationary contact is a copper contact, and the connecting member includes a carbon steel bolt or a stainless steel bolt.

[0015] In a possible implementation, a nickel plating layer is further provided on the surface of the connecting piece.

[0016] In a possible implementation manner, a mounting groove is further provided at one end of the connecting member away from the static contact.

[0017] On the other hand, the present application provides a relay, comprising a housing and any one of the relay static contact assemblies described above, wherein the static contact of the relay static contact assembly is disposed through the housing.

[0018] In a possible implementation, two relay static contact assemblies are provided on the housing, and the two relay static contact assemblies are used to connect the positive copper busbar and the negative copper busbar respectively.

[0019] On the other hand, the present application provides an electrical device, including any of the relays described above, wherein the electrical device includes a battery pack, a vehicle, or an energy storage device.

[0020] The present application provides a relay static contact assembly, a relay and an electrical device, wherein the relay static contact assembly includes a static contact and a connector, wherein the hardness of the static contact is less than that of the connector, wherein one of the static contact and the connector is provided with a first connection portion, and the other is provided with a second connection portion, wherein the first connection portion is threadedly connected to the second connection portion, and the first connection portion is welded to the second connection portion. By selecting a connector having a higher hardness than the static contact, the present application enables the static contact assembly to withstand a higher torque, and can have a lower contact resistance when connected to a copper busbar of an external circuit, which is beneficial to reducing safety hazards when the relay is used. The static contact and the connector are first threadedly connected, and then welded to fill the connection gap between the two, thereby ensuring the stability of the connection between the static contact and the connector. Brief Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of the static contact assembly of a relay provided by an embodiment of the present application;

[0023] Figure 2 Structural schematic diagram of the static contact provided by an embodiment of the present application;

[0024] Figure 3 Structural schematic diagram of the external bolt provided by an embodiment of the present application;

[0025] Figure 4 Structural schematic diagram of the relay provided by an embodiment of the present application;

[0026] Figure 5 Usage state diagram of the relay provided by an embodiment of the present application;

[0027] Figure 6 For Figure 5 top view;

[0028] Figure 7 Schematic diagram of an intermediate process during the manufacturing of the relay provided by an embodiment of the present application.

[0029] Reference Signs:

[0030] 10 - Relay static contact assembly;

[0031] 20 - Outer shell; 21 - Ceramic housing; 22 - Connection plate; 23 - Support plate; 24 - Sleeve;

[0032] 30 - Moving contact assembly; 31 - Moving contact; 32 - Moving contact outer shell; 33 - First spring;

[0033] 40 - Moving push rod assembly; 41 - Push rod; 42 - Moving iron core; 43 - Limit post; 44 - Second spring;

[0034] 51 - Positive copper busbar; 52 - Negative copper busbar;

[0035] 61 - Bolt; 62 - Flange;

[0036] 100 - Stationary contact; 110 - First connecting part; 111 - Connecting hole; 1111 - Internal thread section; 1112 - Solder storage part; 112 - Transition hole section;

[0037] 200 - Connector; 210 - Second connecting part; 211 - First external thread section; 212 - Transition section; 220 - Second external thread section; 230 - Installation groove;

[0038] 1000 - Solder. Specific embodiments

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0040] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0041] As described in the background art, in the solutions of the related art, since the stationary contact of the relay is made of copper material, the torque that the stationary contact can withstand is relatively low. When the stationary contact is connected to the copper busbar of the external circuit, the contact force between the copper busbar and the stationary contact assembly is relatively low, the contact resistance is relatively large, and high temperature or even fire is likely to occur, posing a safety hazard.

[0042] In view of this, the embodiments of the present application aim to provide a relay stationary contact assembly, a relay, and an electrical equipment. By making the hardness of the stationary contact less than that of the connector, the stationary contact assembly can withstand a higher torque, and when connected to the copper busbar of the external circuit, it can have a lower contact resistance, which is beneficial to reducing the safety hazard during the use of the relay. The stationary contact and the connector are first connected by threads and then welded to fill the connection gap between the two, ensuring the stability of the connection between the stationary contact and the connector.

[0043] The content of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present application in more detail.

[0044] Figure 1 It is a structural schematic diagram of a relay stationary contact assembly provided by an embodiment of the present application, Figure 2 It is a structural schematic diagram of a stationary contact provided by an embodiment of the present application, Figure 3 It is a structural schematic diagram of an external bolt provided by an embodiment of the present application.

[0045] Please refer to Figures 1 - 3, this embodiment provides a static contact assembly 10 of a relay, which includes a static contact 100 and a connecting member 200. The hardness of the static contact 100 is less than that of the connecting member 200. Among them, the static contact 100 is used to cooperate with the moving contact in the relay, and the on-off of the circuit is controlled by the contact or separation of the two. The connecting member 200 is used to connect with the copper busbar in the external circuit. The connecting member 200 is made of a material with higher hardness, which can ensure that the static contact assembly 10 of the relay can withstand a higher torque and has a lower contact resistance when connecting with the copper busbar of the external circuit, which is beneficial to reducing the potential safety hazards during the use of the relay.

[0046] In this embodiment, one of the static contact 100 and the connecting member 200 is provided with a first connecting portion 110, and the other is provided with a second connecting portion 210. The static contact 100 and the connecting member 200 are connected into one body through the first connecting portion 110 and the second connecting portion 210. Specifically, the first connecting portion 110 and the second connecting portion 210 are threadedly connected to achieve preliminary installation and fixation. Since there may still be a gap between the static contact 100 and the connecting member 200 after threaded connection, the first connecting portion 110 and the second connecting portion 210 of this embodiment are further fixedly connected by welding, which can further improve the connection stability between the static contact 100 and the connecting member 200 after welding.

[0047] It can be seen from the above description that compared with the solutions in the related art, the static contact assembly 10 of this embodiment can withstand a higher torque and has a lower contact resistance when connecting with the copper busbar of the external circuit, which is beneficial to reducing the potential safety hazards during the use of the relay.

[0048] In this embodiment, the first connecting portion 110 includes a connecting hole 111 provided at the first end of the static contact 100 (it can be understood that the second end of the static contact 100 is the end for contact and cooperation with the moving contact). An internal thread section 1111 is provided in the connecting hole 111, and the internal thread section 1111 is provided with internal threads.

[0049] The connecting member 200 includes a bolt, and the second connecting portion 210 includes a first external thread section 211 provided on the bolt. The first external thread section 211 is provided with first external threads.

[0050] The connecting member 200 is threadedly connected to the internal thread section 1111 on the static contact 100 through the first external thread section 211, and the first external thread section 211 and the internal thread section 1111 are welded.

[0051] Please continue to refer to Figures 1 - 3 , the connecting member 200 of this embodiment further includes a second external thread section 220. The second external thread section 220 is used to connect the copper busbar. For example, the copper busbar can be passed through the connecting member 200, and then cooperated with the second external thread section 220 through an external fastener to press the copper busbar between the fastener and the static contact 100.

[0052] Further, the diameter of the second external thread section 220 of this embodiment is greater than the diameter of the first external thread section 211. The second connection part 210 further includes a transition section 212, which is arranged between the first external thread section 211 and the second external thread section 220, and the diameter of the transition section 212 gradually increases from the first external thread section 211 to the second external thread section 220.

[0053] Correspondingly, the first connection part 110 further includes a transition hole section 112, which is connected to the connection hole 111, and the inner diameter of the transition hole section 112 gradually increases in the direction away from the connection hole 111.

[0054] When the static contact 100 is connected to the connecting piece 200, the transition section 212 and the transition hole section 112 are welded. Through the above structure, the welding area between the static contact 100 and the connecting piece 200 can be increased, thereby improving the welding stability and the connection strength after welding. In addition, setting the transition section 212 can also avoid the phenomenon of stress concentration on the connecting piece 200.

[0055] Please continue to refer to Figure 1 and Figure 2 , in a possible implementation manner, a solder storage part 1112 is formed at the bottom of the connection hole 111 of this embodiment, and the solder storage part 1112 is used to store solder before welding. That is to say, the solder can be pre-buried in the solder storage part 1112 before welding. For example, before the static contact 100 is threadedly connected to the connecting piece 200, the solder can be first put into the solder storage part 1112.

[0056] The welding method of the first connection part 110 and the second connection part 210 in this embodiment can be selected according to actual needs.

[0057] For example, a tunnel electric furnace can be used for welding. Specifically, after the static contact 100 is threadedly connected to the connecting piece 200, the entire relay static contact assembly 10 can be inverted (that is, Figure 1 the shown structure is flipped 180° in the plane so that the static contact 100 is on the top and the connecting piece 200 is on the bottom) and then put into the tunnel electric furnace. Under the action of the high temperature in the furnace, the solder in the solder storage part 1112 melts to fill the gap between the first connection part 110 and the second connection part 210, thereby realizing the welded connection between the first connection part 110 and the second connection part 210.

[0058] For another example, welding can be performed by induction heating. Specifically, after the static contact 100 is threadedly connected to the connector 200, the entire relay static contact assembly 10 can be inverted, and the induction coil can be sleeved on the outer peripheral side of the first connecting part 110. Under the action of the induction coil, the solder in the solder storage part 1112 melts to fill the gap between the first connecting part 110 and the second connecting part 210, thereby achieving a welding connection between the first connecting part 110 and the second connecting part 210.

[0059] The solder of this embodiment can be, for example, silver-copper solder (including 72% silver and 28% copper), which has a suitable melting point (its melting point is about 780°C, which is lower than the melting points of copper and steel), thereby ensuring that the static contact 100 and the connector 200 will not melt during welding. In addition, the silver-copper solder also has good electrical conductivity, thermal conductivity and high strength, which can ensure the electrical and thermal conductivity of the relay static contact assembly 10 after welding, as well as the connection stability between the static contact 100 and the connector 200.

[0060] It is understandable that other suitable solders besides silver-copper solder may be used as long as they can meet the requirements of melting point temperature during welding.

[0061] Furthermore, the stationary contact 100 of this embodiment can be selected as a copper contact. Since the moving contact is generally made of copper material, the stationary contact 100 is also made of copper material to ensure good conductivity, thereby reducing the contact resistance when the stationary contact 100 contacts the moving contact, which is beneficial to increasing the service life.

[0062] The connecting member 200 can be selected as a carbon steel bolt or a stainless steel bolt, and carbon steel bolts are preferably used so as to have a lower cost while meeting the performance requirements.

[0063] In this embodiment, the surface of the connector 200 is also provided with a nickel plating layer (not shown in the figure). The connector 200 after nickel plating has better chemical stability during the welding process. The nickel plating layer serves as a barrier layer between copper and steel, which can prevent direct diffusion reaction between copper and steel during the welding process.

[0064] Please continue to refer to Figure 1 In this embodiment, the end of the connector 200 away from the static contact 100 is further provided with a mounting groove 230, which facilitates the operator to screw the connector 200 into the connecting hole 111 through a tool. The specific structure of the mounting groove 230 can be set as required, for example, it can be in a straight line, a cross, a hexagon, a star or a square shape.

[0065] Figure 4 A simplified structural diagram of a relay provided in an embodiment of the present application, Figure 5 A diagram showing the use status of a relay provided in an embodiment of the present application.Figure 6 is Figure 5 the top view of

[0066] Please refer to Figures 4 - 6 , this embodiment also provides a relay, including a housing 20 and the above-mentioned relay static contact assembly 10. The static contact 100 of the relay static contact assembly 10 penetrates through the housing 20.

[0067] Specifically, a cavity is formed inside the housing 20. Part of the static contact 100 is located in the cavity to cooperate with the moving contact; the other part of the static contact 100 is located outside the cavity to connect to the copper bar of the external circuit. Due to the adoption of the above-mentioned relay static contact assembly 10, when the relay of this embodiment is connected to the copper bar of the external circuit, it can withstand a higher torque, thereby having a lower contact resistance, which is beneficial to reducing the safety hazards during the use of the relay.

[0068] In this embodiment, two relay static contact assemblies 10 are provided on the housing 20. The two relay static contact assemblies 10 are respectively used to connect to the positive copper bar 51 and the negative copper bar 52, so as to connect the relay to the external circuit.

[0069] Specifically, the connection structures of the relay static contact assembly 10 when connected to the positive copper bar 51 or the negative copper bar 52 are the same in this embodiment. Taking the connection of the relay static contact assembly 10 to the positive copper bar 51 as an example, the positive copper bar 51 can be pressed and fixed through the bolt 61 and the flange 62; specifically, the flange 62 is arranged between the bolt 61 and the positive copper bar 51, and the bolt 61 is tightened and fixed through the second external thread section 220 on the connecting member 200, so as to press and fix the positive copper bar 51 between the bolt 61 and the static contact 100, ensuring good contact between the positive copper bar 51 and the static contact 100.

[0070] The relay of this embodiment further includes a moving contact assembly 30 and a moving push rod assembly 40. Among them, the moving contact assembly 30 is arranged in the above-mentioned cavity and is used to cooperate with the static contact 100 of the static contact assembly 10. The moving push rod assembly 40 penetrates through the cavity to drive the moving contact assembly 30 to approach or move away from the static contact 100. The housing 20 includes a ceramic housing 21, a connecting plate 22 and a support plate 23. The ceramic housing 21 is connected to the support plate 23 as a whole through the connecting plate 22, thereby enclosing the above-mentioned cavity. The moving contact assembly 30 includes a moving contact 31 and a moving contact housing 32, and the moving contact 31 is arranged at the end of the moving contact housing 32. The moving push rod assembly 40 includes a push rod 41, a moving iron core 42 and a limiting column 43. The housing 20 further includes a sleeve 24. The sleeve 24 and the support plate 23 enclose an installation space for installing the moving iron core 42 and the limiting column 43. One end of the push rod 41 is fixedly connected to the moving iron core 42, and the other end passes through the limiting column 43 and the support plate 23 and then connects to the moving contact housing 32. A gap is formed between the moving iron core 42 and the limiting column 43, and the limiting column 43 is fixedly arranged in the installation space.

[0071] The moving iron core 42 can move under the drive of an external electromagnetic force, thereby driving the push rod 41 to move together. The push rod 41 can push the moving contact housing 32 and the moving contact 31 towards the static contact 100. After the static contact 100 and the moving contact 31 come into contact, the conduction of the external circuit can be realized. After removing the external electromagnetic force, the push rod 41 and the moving iron core 42 move in a direction away from the static contact 100, so that the static contact 100 and the moving contact 31 are disconnected.

[0072] In this embodiment, a first spring 33 is further provided inside the moving contact housing 32, and a second spring 44 is further provided between the moving iron core 42 and the limit post 43. The first spring 33 and the second spring 44 are compressed when the push rod 41 and the moving iron core 42 move towards the side of the static contact 100, thereby storing a certain amount of elastic potential energy. When the external electromagnetic force is removed, the elastic potential energy released by the first spring 33 and the second spring 44 can assist in pushing the push rod 41 and the moving iron core 42 in a direction away from the static contact 100.

[0073] Figure 7 It is a schematic diagram of an intermediate process during the manufacturing of a relay provided by an embodiment of the present application.

[0074] As Figure 7 shown, in this embodiment, the static contact 100, the connecting member 200, the ceramic housing 21, and the connecting plate 22 can all be fixed together by welding. Specifically, after pre-embedding the solder 1000 in the static contact 100, the static contact 100 is threadedly connected to the connecting member 200. Then, the ceramic housing 21 is pre-assembled and positioned with the static contact 100, the connecting member 200, and the connecting plate 22 through a fixture, and the static contact 100, the connecting member 200, the ceramic housing 21, and the connecting plate 22 are integrally inverted. Solder is also filled between the ceramic housing 21 and the static contact 100 and between the ceramic housing 21 and the connecting plate 22. Subsequently, the static contact 100, the connecting member 200, the ceramic housing 21, and the connecting plate 22 are placed in a tunnel electric furnace, and under the action of high temperature in the furnace, the welding connection between the components is completed, thereby forming an integral body.

[0075] This embodiment further provides an electrical device, including the above relay. The electrical device can include a battery pack, a vehicle, or an energy storage device.

[0076] It can be understood that, due to the adoption of the above relay, therefore, when the relay in the electrical device of this embodiment is connected to the copper bar of the external circuit, it can withstand a higher torque, thereby having a lower contact resistance, which is beneficial to reducing the safety hazards during the use of the relay.

[0077] Specifically, when the relay is applied to a battery pack, the relay can control the output of the electrical energy of the battery pack. Since the relay can withstand a higher torque, the safety during the charging and discharging process of the battery pack can be improved.

[0078] When the relay is applied to a vehicle, the vehicle can be, for example, an electric vehicle or a hybrid vehicle. When the vehicle is in the starting state, the relay can output the electric energy of the battery pack to the motor of the electric vehicle to drive the vehicle to travel. When the vehicle is in a stopped state or does not require power output, the relay can switch the battery pack to other power sources, such as a generator or a storage battery, to meet the needs of other electrical devices of the vehicle. During the driving process of the vehicle, abnormal conditions such as overcharging, over-discharging, and short-circuiting of the battery pack may occur; since the relay can withstand a relatively high torque, the probability of high temperature and fire can be effectively reduced, and the safety of vehicle use can be improved.

[0079] When the relay is applied to an energy storage device, during the charging and discharging process of the energy storage device, the relay is responsible for controlling the opening and closing of the circuit to achieve precise management of the power source. The relay can detect and respond to abnormal conditions in the circuit. Once it detects faults such as overcharging, over-discharging, and short-circuiting of the battery, the relay will quickly cut off the circuit to prevent the expansion of the fault. Since the relay can withstand a relatively high torque, it can better protect the safety of the energy storage device.

[0080] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0081] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0082] It should be noted that in the description of the present application, the terms "first" and "second" are only used for the convenience of describing different components, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0083] In the embodiments or implementation manners of the present application, a progressive description is adopted. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0084] In the description of the present application, the description with reference to terms such as "one implementation manner", "some implementation manners", "illustrative implementation manner", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the implementation manner or example are included in at least one implementation manner or example of the present application. In the present application, the illustrative expression of the above terms does not necessarily refer to the same implementation manner or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more implementation manners or examples.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A relay static contact assembly (10), characterized in that: The invention comprises a stationary contact (100) and a connecting piece (200), wherein the hardness of the stationary contact (100) is smaller than that of the connecting piece (200), one of the stationary contact (100) and the connecting piece (200) is provided with a first connecting portion (110), and the other is provided with a second connecting portion (210), the first connecting portion (110) and the second connecting portion (210) are threadedly connected, and the first connecting portion (110) and the second connecting portion (210) are welded.

2. The relay static contact assembly (10) according to claim 1, characterized in that: The first connecting portion (110) comprises a connecting hole (111) arranged at the first end of the stationary contact (100), and an internal thread section (1111) is provided in the connecting hole (111); The connecting member (200) comprises a bolt, and the second connecting portion (210) comprises a first external thread section (211) arranged on the bolt; The first external thread segment (211) is threadedly connected to the internal thread segment (1111), and the first external thread segment (211) is welded to the internal thread segment (1111).

3. The relay static contact assembly (10) according to claim 2, characterized in that: The connecting piece (200) further comprises a second external thread section (220), wherein the second external thread section (220) is used for connecting the copper busbar.

4. The relay static contact assembly (10) according to claim 3, characterized in that: The diameter of the second external thread section (220) is greater than the diameter of the first external thread section (211); the second connecting portion (210) further comprises a transition section (212), the transition section (212) is arranged between the first external thread section (211) and the second external thread section (220), and the diameter of the transition section (212) gradually increases from the first external thread section (211) to the second external thread section (220); The first connecting portion (110) further comprises a transition hole section (112), wherein the transition hole section (112) is connected to the connecting hole (111), and the inner diameter of the transition hole section (112) gradually increases in a direction away from the connecting hole (111); The transition section (212) is welded to the transition hole section (112).

5. The relay static contact assembly (10) according to claim 4, characterized in that: A solder storage portion (1112) is formed at the bottom of the connection hole (111), and the solder storage portion (1112) is used to store solder.

6. The relay static contact assembly (10) according to claim 2, characterized in that: The stationary contact (100) is a copper contact, and the connecting piece (200) comprises a carbon steel bolt or a stainless steel bolt.

7. The relay static contact assembly (10) according to claim 6, characterized in that: The surface of the connecting piece (200) is also provided with a nickel plating layer.

8. The relay static contact assembly (10) according to claim 1, characterized in that: An installation groove (230) is also provided at one end of the connecting member (200) facing away from the static contact (100).

9. A relay, characterized in that: It comprises a housing (20) and a relay static contact assembly (10) as claimed in any one of claims 1 to 8, wherein the static contact (100) of the relay static contact assembly (10) is inserted into the housing (20).

10. The relay according to claim 9, characterized in that: The housing (20) is provided with two relay static contact assemblies (10), and the two relay static contact assemblies (10) are used to connect the positive copper bar (51) and the negative copper bar (52) respectively.

11. An electrical device, characterized in that: Comprising a relay as described in any one of claims 9-10, the electrical equipment comprises a battery pack, a vehicle or an energy storage device.

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