High voltage DC relay

Abstract

This application relates to a high-voltage DC relay, which includes an insulating cover and a welded component. The insulating cover has a first welded surface; the welded component has a second welded surface, the second welded surface facing the first welded surface and welded to the first welded surface. At least a portion of the second welded surface has a gap with the first welded surface, the gap being capable of generating a capillary effect to attract solder. By providing a gap between the first welded surface of the insulating cover and the second welded surface of the welded component, this high-voltage DC relay allows for better solder adsorption between the insulating cover and the welded component, suppressing solder creep along the Z-axis, increasing the effective weld surface area, and improving the weld strength between the welded component and the insulating cover, thereby ensuring the electrical performance of the relay.

Description

Technical Field

[0001] This application relates to the field of relay technology, and in particular to high-voltage DC relays. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is 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] A high-voltage DC relay is a type of relay. Its existing structure mainly includes an insulating cover, a yoke plate, a pair of stationary contacts, and a moving spring. The yoke plate is installed at the bottom of the insulating cover, and the two are connected by a frame to form a contact chamber. A pair of stationary contacts extend into the contact chamber from the top of the insulating cover, and the moving contact is located in the contact chamber and can correspond to and cooperate with the bottom of the pair of stationary contacts.

[0004] Currently, the stationary contact and frame are mostly connected to the insulating cover by welding, but poor welding is prone to occur, resulting in insufficient welding strength, which in turn affects the electrical performance of the relay. Utility Model Content

[0005] Therefore, it is necessary to provide a high-voltage DC relay to address the problem of insufficient welding strength between the stationary contact and the frame and the insulating cover.

[0006] A high-voltage DC relay, comprising:

[0007] An insulating cover having a first welding surface; and

[0008] A welded component having a second welding surface facing and welded to a first welding surface, wherein at least a portion of the second welding surface has a gap with the first welding surface, the gap being capable of generating a capillary effect to adsorb solder.

[0009] In one embodiment, the insulating cover and the weldment are welded together such that the first weld surface and the second weld surface form an annular sealing weld surface;

[0010] The second welding surface includes a first welding side portion and a second welding side portion that are in the shape of an annular ring. The second welding side portion is arranged around the outside of the first welding side portion, and the included angle between the first welding side portion and / or the second welding side portion and the first welding surface forms the gap.

[0011] In one embodiment, the first welded side surface and / or the second welded side surface are inclined surfaces, and the gap decreases in the direction in which the first welded side surface and the second welded side surface approach each other.

[0012] In one embodiment, the first welded side surface and / or the second welded side surface is an arcuate convex surface or a curved convex surface, and the gap decreases along the direction in which the first welded side surface and the second welded side surface approach each other.

[0013] In one embodiment, the second welded side portion has the same structure as the first welded side portion.

[0014] In one embodiment, the second welding surface further includes an abutting portion located between the first welding side portion and the second welding side portion, the abutting portion abutting against the first welding surface.

[0015] In one embodiment, the welded component has a welded end near the insulating cover, the outer surface of the welded end being the second welded surface, and the welded end being an outwardly or inwardly extending flange structure such that the angle between the inner or outer circumferential surface of the welded end and the first welded surface forms the gap.

[0016] In one embodiment, the welded component is a stationary contact, which includes a contact portion and a mounting portion. The contact portion is inserted into the insulating cover and can contact the moving spring. The mounting portion is arranged around the contact portion and located outside the insulating cover. The top surface of the insulating cover is the first welding surface, and the surface of the mounting portion facing the top surface of the insulating cover is the second welding surface.

[0017] In one embodiment, an annular space is spaced between the end of the mounting portion near the insulating cover and the contact portion.

[0018] In one embodiment, the welded component is a frame piece, wherein the bottom surface of the insulating cover is the first welded surface, and the surface of the frame piece facing and close to the bottom surface of the insulating cover is the second welded surface.

[0019] In one embodiment, the frame includes a first assembly portion and a second assembly portion connected together, the first assembly portion being connected to the insulating cover, the second assembly portion extending from the first assembly portion along a direction away from the central axis of the insulating cover, and the second assembly portion being connected to a yoke plate.

[0020] The aforementioned high-voltage DC relay has at least the following effects:

[0021] By providing a gap between the first welding surface of the insulating cover and the second welding surface of the welded component (such as a stationary contact or frame), a capillary effect can be generated, allowing the solder to be better adsorbed between the insulating cover and the welded component. This can suppress the solder from climbing along the Z-axis (i.e., the direction of the central axis of the insulating cover), increase the effective welding surface, and improve the welding strength between the welded component and the insulating cover, thereby ensuring the electrical performance of the relay. Attached Figure Description

[0022] Figure 1 This is a partial schematic diagram of an insulating cover and a welded component provided in Embodiment 1 of this application.

[0023] Figure 2 This is a schematic diagram of the structure of the high-voltage DC relay provided in Embodiment 1 of this application.

[0024] Figure 3 for Figure 2 A cross-sectional view of the provided high-voltage DC relay.

[0025] Figure 4 This is an exploded view of the insulating cover, stationary contact, and frame provided in Embodiment 1 of this application.

[0026] Figure 5 Figure 1 A schematic diagram showing the provided insulating cover and the welded components after welding.

[0027] Figure 6 A half-sectional schematic diagram of another insulating cover and welded component provided in Embodiment 1 of this application.

[0028] Figure 7 A half-sectional schematic diagram of another insulating cover and welded component provided in Embodiment 1 of this application.

[0029] Figure 8 Example 2 provides a cross-sectional view of an insulating cover, stationary contact, and frame.

[0030] Figure 9 for Figure 8 A magnified view of a portion at point A.

[0031] Figure 10 This is a cross-sectional view of another insulating cover, stationary contact, and frame provided in Example 2.

[0032] Figure 11 for Figure 10 A magnified view of a portion at point B.

[0033] Figure 12 This is a cross-sectional view of another insulating cover, stationary contact, and frame provided in Example 2.

[0034] Figure 13 for Figure 12A magnified view of a portion at point C.

[0035] Figure 14 This is a cross-sectional view of the stationary contact provided in Example 2.

[0036] Figure 15 This is a cross-sectional view of an insulating cover, stationary contact, and frame provided in Embodiment 3.

[0037] Figure 16 for Figure 15 A magnified view of a portion at point D.

[0038] Figure 17 This is a schematic diagram of the frame provided in Example 3.

[0039] Figure 18 This is a partial schematic diagram of another insulating cover and welded component provided in Embodiment 4 of this application.

[0040] Figure 19 This is a cross-sectional view of another insulating cover, stationary contact, and frame provided in Example 5.

[0041] Figure 20 for Figure 19 A magnified view of a portion at point D.

[0042] The labels in the attached diagram are explained as follows:

[0043] 10. High-voltage DC relay; 100. Insulating cover; 110. First welding surface; 10a. Gap; 10b. Annular space; 200. Welded part; 200a. Welding end; 210. Second welding surface; 211. First welding side; 212. Second welding side; 213. Abutting part; 201. Stationary contact; 2011. Contact part; 2012. Mounting part; 202. Frame piece; 2021. First assembly part; 2022. Second assembly part; 300. Moving spring; 400. Yoke plate; 500. Base; 600. Electromagnetic assembly; 700. Pushing assembly; M. Solder; N. Central axis. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Example 1

[0051] like Figure 1 As shown, this embodiment provides a high-voltage DC relay 10, which includes an insulating cover 100 and a welding component 200; the insulating cover 100 has a first welding surface 110; the welding component 200 has a second welding surface 210, the second welding surface 210 faces the first welding surface 110 and is welded to the first welding surface 110, wherein at least a portion of the second welding surface 210 has a gap 10a between it and the first welding surface 110, the gap 10a being capable of generating a capillary effect to adsorb solder.

[0052] The aforementioned welded component 200 refers to the part welded to the insulating cover 100 in the high-voltage DC relay 10, for example... Figures 2 to 4 The stationary contact 201 or frame 202 of the high-voltage DC relay 10 shown in the figure, that is, the stationary contact 201, frame 202 and insulating cover 100 of the high-voltage DC relay 10 are usually connected by welding. In the existing process, because the welding contact 201, frame 202 and insulating cover 100 are relatively flat, the solder will move along the Z-axis (i.e., Figure 2 and Figure 3 The "Z+ direction" or "Z- direction" in the text (equivalent to the central axis N direction of the insulating cover 100) climbs from top to bottom or from bottom to top, leading to frequent welding defects, insufficient welding strength, and thus affecting the electrical performance of the relay.

[0053] In response, this application improves the welding surface between the insulating cover 100 and the welded part 200 (i.e., the stationary contact 201 or the frame 202). Specifically, a gap 10a is provided between the first welding surface 110 of the insulating cover 100 and the second welding surface 210 of the welded part 200. This gap 10a can generate a capillary effect, allowing the solder to be better adsorbed between the insulating cover 100 and the welded part 200, which can suppress the solder from climbing along the Z-axis and improve the welding strength between the welded part 200 and the insulating cover 100, thereby ensuring the electrical performance of the relay.

[0054] It should be noted that the gap 10a between the first welding surface 110 of the insulating cover 100 and the second welding surface 210 of the welded part 200 should be controlled within a reasonable small range (e.g., 0.05mm~0.2mm) to utilize the capillary effect to drive the solder to spontaneously fill the gap 10a, while avoiding poor venting due to the gap 10a being too small.

[0055] Figure 5 A schematic diagram of the welded parts 200 and 100 after welding is given. Figure 5 As can be seen, solder M can extend laterally instead of climbing vertically along the Z-axis, thereby increasing the contact area at the bottom of solder M.

[0056] In one embodiment, the insulating cover 100 and the welded component 200 are welded together such that a first welding surface 110 and a second welding surface 210 form an annular sealing welding surface. The annular sealing welding surface can increase the welding area of ​​the insulating cover 100 and the welded component 200, thereby improving the welding strength of both.

[0057] The insulating cover 100 is usually made of ceramic. However, ceramic is more brittle than other materials (such as metals), which is not conducive to subsequent machining (such as cutting). Based on this characteristic, this application improves the second welding surface 210 of the welded part 200 so that a gap 10a is formed between the second welding surface 210 of the welded part 200 and the first welding surface 110 of the insulating cover 100. That is, the first welding surface 110 of the insulating cover 100 is still planar, while the second welding surface 210 of the welded part 200 is made non-planar.

[0058] See Figure 1 The second welding surface 210 of the weldment 200 includes a first welding side surface portion 211 and a second welding side surface portion 212 that are annular. The second welding side surface portion 212 is positioned around the outside of the first welding side surface portion 211, and the included angle between the first welding side surface portion 211 and the second welding side surface portion 212 and the first welding surface 110 forms a gap 10a. This arrangement prevents solder from climbing up the inner and outer sides of the weldment 200, thereby significantly improving the welding strength between the weldment 200 and the insulating cover 100.

[0059] Of course, in other embodiments, the angle between the first welding side portion 211 of the second welding surface 210 and the first welding surface 110 has a gap 10a, or the angle between the second welding side portion 212 of the second welding surface 210 and the first welding surface 110 has a gap 10a.

[0060] Among them, such as Figure 6As shown, the first welded side surface 211 is an inclined surface, and the corresponding gap 10a decreases along the direction in which the first welded side surface 211 and the second welded side surface 212 approach each other. That is, the distance between the first welded side surface 211 and the first welded surface 110 gradually increases in the direction along the central axis M of the insulating cover 100. The welded part 200 with this structure is easy to process.

[0061] Of course, such as Figure 1 As shown, the first welded side surface 211 can also be configured as a rounded convex surface or a curved convex surface, and the corresponding gap 10a decreases along the direction in which the first welded side surface 211 and the second welded side surface 212 approach each other. The first welded side surface 211 of this structure is relatively smooth, which can prevent scratching operators or damaging other components. Alternatively, the first welded side surface 211 can be configured as... Figure 7 The circular arc concave surface is shown. Compared to the circular arc concave surface, the circular arc convex surface allows for a smaller gap 10a between the weldment 200 and the insulating cover 100, enhancing the capillary effect and facilitating solder adsorption. Therefore, the first weld side surface 211 can be preferably set as a circular arc convex surface.

[0062] The second welding side surface 212 has the same structure as the first welding side surface 211, for example, both are designed as inclined surfaces or arc surfaces. This facilitates the processing and production of the welded part 200 and also ensures that the welding strength between the inner and outer sides of the welded part 200 and the insulating cover 100 is approximately the same. It should be noted that when the second welding side surface 212 is designed as an inclined surface, the distance between the second welding side surface 212 and the first welding surface 110 gradually decreases in the direction close to the central axis M of the insulating cover 100.

[0063] Furthermore, such as Figure 1 , Figure 6 and Figure 7 As shown, the second welding surface 210 may further include an abutment portion 213, which is located between the first welding side surface portion 211 and the second welding side surface portion 212, and abuts against the first welding surface 110. The abutment portion 213 is provided so that the insulating cover 100 can support the welded part 200, prevent the welded part 200 from shaking during welding, and ensure welding quality.

[0064] The shape of the abutment portion 213 can be set according to the shapes of the first welding side portion 211 and the second welding side portion 212 of the second welding surface 210, for example, such as Figure 1 As shown, the abutment portion 213 is a circular arc convex surface with the same curvature as the first welding side surface portion 211 and the second welding side surface portion 212, that is, the abutment portion 213 forms a smooth circular arc surface with the first welding side surface portion 211 and the second welding side surface portion 212.

[0065] like Figure 2 and Figure 3As shown, the high-voltage DC relay 10 may also include a yoke plate 400 and a moving spring 300. The yoke plate 400 is located at the bottom of the insulating cover 100 and the two are connected by a frame 202 to form a contact chamber. The moving spring 300 is movably disposed in the contact chamber. There are two stationary contacts 201. The two stationary contacts 201 are spaced apart at both ends of the insulating cover 100 along the length direction of the insulating cover 100 and contact the corresponding ends of the moving spring 300 along the length direction.

[0066] like Figure 2 and Figure 3 As shown, the high-voltage DC relay 10 may further include a base 500, an electromagnetic component 600, and a push component 700. The electromagnetic component 600 is disposed on the base 500 and can drive the moving spring 300 to move towards or away from the stationary contact 201 through the push component 700, so that the moving spring 300 contacts the stationary contact 201 or disengages from the stationary contact 201.

[0067] Example 2

[0068] like Figures 8 to 13 As shown, this embodiment provides a high-voltage DC relay 10. Compared to Embodiment 1, the welded component 200 in this embodiment can specifically be a stationary contact 201. Figure 14 As shown, the stationary contact 201 includes a contact portion 2011 and a mounting portion 2012. The contact portion 2011 is inserted into the insulating cover 100 and can contact the moving spring 300. The mounting portion 2012 is arranged around the contact portion 2011 and located outside the insulating cover 100. The top surface of the insulating cover 100 is the first welding surface 110, and the surface of the mounting portion 2012 facing the top surface of the insulating cover 100 is the second welding surface 210. It should be noted that the top surface of the insulating cover 100 is the surface facing away from the yoke plate 400, and the top surface of the insulating cover 100 is the surface facing the yoke plate 400.

[0069] By providing a gap 10a between the first welding surface 110 of the insulating cover 100 and the second welding surface 210 of the stationary contact 201, the gap 10a can generate a capillary effect, allowing the solder to be better adsorbed between the insulating cover 100 and the stationary contact 201, which can suppress the solder from climbing along the Z-axis and improve the welding strength between the stationary contact 201 and the insulating cover 100, thereby ensuring the electrical performance of the relay.

[0070] In this embodiment, such as Figure 9As shown, the second welding surface 210 of the stationary contact 201 includes a first welding side surface 211 and a second welding side surface 212 facing each other, and an abutment portion 213 located between the first welding side surface 211 and the second welding side surface 212. The first welding side surface 211, the second welding side surface 212, and the abutment portion 213 are convex arc surfaces with the same curvature. Of course, in other embodiments, the shapes of the first welding side surface 211, the second welding side surface 212, and the abutment portion 213 can be correspondingly set according to requirements. For example, such as... Figure 11 As shown, the second welded side surface 212 is a convex arc, while the first welded side surface 211 and the abutment portion 213 are flat surfaces; as another example, such as Figure 13 As shown, the second welded side surface 212 is an inclined surface, while the first welded side surface 211 and the abutment part 213 are flat surfaces.

[0071] like Figure 14 As shown, an annular space 10b is provided between the end of the mounting portion 2012 near the insulating cover 100 and the contact portion 2011. The materials of the stationary contact 201 and the insulating cover 100 are often different, resulting in different coefficients of thermal expansion between them, which makes it easy to generate thermal stress during welding. In this regard, the present application provides an annular space 10b between the end of the mounting portion 2012 near the insulating cover 100 and the contact portion 2011, which is equivalent to reducing the radial thickness of the mounting portion 2012, making the mounting portion 2012 easier to deform, thereby absorbing the thermal stress generated by welding. In addition, as mentioned above, the gap 10a between the first welding surface 110 and the second welding surface 210 increases the welding strength between the stationary contact 201 and the insulating cover 100. Thus, it is not necessary to increase the contact area between the stationary contact 201 and the insulating cover 100 to ensure the welding strength between them. This is equivalent to further reducing the radial thickness of the mounting portion 2012, making the mounting portion 2012 more deformable and facilitating the absorption of thermal stress generated by welding.

[0072] Example 3

[0073] like Figure 15 As shown, this embodiment provides a high-voltage DC relay 10. Compared to Embodiment 1, the welded component 200 in this embodiment can specifically be a frame piece 202. For example... Figure 16 As shown, the bottom surface of the insulating cover 100 is the first welding surface 110, and the surface of the frame piece 202 facing and close to the bottom surface of the insulating cover 100 is the second welding surface 210. It should be noted that the top surface of the insulating cover 100 is the surface facing away from the yoke plate 400, and the top surface of the insulating cover 100 is the surface facing the yoke plate 400.

[0074] By providing a gap 10a between the first welding surface 110 of the insulating cover 100 and the second welding surface 210 of the frame piece 202, the gap 10a can generate a capillary effect, allowing the solder to be better adsorbed between the insulating cover 100 and the frame piece 202, which can suppress the solder from climbing along the Z-axis and improve the welding strength between the frame piece 202 and the insulating cover 100, thereby ensuring the electrical performance of the relay.

[0075] In this embodiment, the second welding surface 210 of the frame piece 202 includes a first welding side surface 211 and a second welding side surface 212 facing each other, and an abutment portion 213 located between the first welding side surface 211 and the second welding side surface 212. The shapes of the first welding side surface 211, the second welding side surface 212, and the abutment portion 213 can be configured according to requirements. For example, as shown... Figure 16 As shown, the first welding side surface 211 is a convex arc surface, while the second welding side surface 212 and the abutment part 213 are flat surfaces; as another example, the first welding side surface 211 is an inclined surface, while the second welding side surface 212 and the abutment part 213 are flat surfaces; as yet another example, the first welding side surface 211, the second welding side surface 212 and the abutment part 213 are convex arc surfaces with the same curvature.

[0076] In this embodiment, such as Figure 17 As shown, the frame piece 202 includes a first mounting portion 2021 and a second mounting portion 2022 connected together. The first mounting portion 2021 is connected to the insulating cover 100, and the second mounting portion 2022 extends from the first mounting portion 2021 in a direction away from the central axis of the insulating cover 100. The second mounting portion 2022 is connected to the yoke plate 400. This structure facilitates the connection of the frame piece 202 with the insulating cover 100 and the yoke plate 400.

[0077] Example 4

[0078] like Figure 18 As shown, this embodiment provides a high-voltage DC relay 10. Compared to Embodiment 1, this embodiment forms a gap 10a between the second welding surface 210 and the first welding surface 110 by flanging the welding component 200. Specifically, the welding component 200 has a welding end 200a near the insulating cover 100. The outer surface of the welding end 200a is the second welding surface 210, and the welding end 200a is an outwardly extending flanged structure so that the angle between the inner circumferential surface of the welding end 200a and the first welding surface 110 forms a gap 10a. The welding component 200 provided in this embodiment can not only lengthen the gap 10a between the second welding surface 210 and the first welding surface 110, enhance the capillary effect, and increase the welding area, but also improve the strength of the welding component 200, especially the strength of the welding end 200a near the insulating cover 100.

[0079] Of course, in other examples, the welding end 200a is an inwardly extending flange structure so that the angle between the outer peripheral surface of the welding end 200a and the first welding surface 110 forms a gap 10a.

[0080] The flange structure can be inclined or Figure 18 The shape shown is curved.

[0081] Example 5

[0082] This embodiment provides a high-voltage DC relay 10. Compared to embodiment 4, the welded component 200 in this embodiment can specifically be a stationary contact 201. For example... Figure 19 and Figure 20 As shown, the bottom surface of the insulating cover 100 is the first welding surface 110, and the stationary contact 201 has a welding end 200a near the insulating cover 100. The welding end 200a is an outwardly extending and curved flange structure. The angle between the inner circumferential surface of the flange structure and the first welding surface 110 forms a gap 10a.

[0083] 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.

[0084] 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 high voltage DC relay, characterized by The application relates to a welding structure, comprising: an insulating cover (100) having a first welding surface (110); and a welding piece (200) having a second welding surface (210) facing the first welding surface (110) and welded with the first welding surface (110), wherein at least part of the second welding surface (210) has a gap (10a) with the first welding surface (110), and the gap (10a) can generate a capillary effect to absorb solder.

2. The high-voltage DC relay according to claim 1, characterized in that The insulating cover (100) and the welding piece (200) are welded together in a mode that the first welding surface (110) and the second welding surface (210) form a ring-shaped sealing welding surface. The second welding surface (210) comprises a first welding side surface part (211) and a second welding side surface part (212) in a ring shape, the second welding side surface part (212) is annularly arranged outside the first welding side surface part (211), and an included angle between the first welding side surface part (211) and / or the second welding side surface part (212) and the first welding surface (110) forms the gap (10a).

3. The high-voltage DC relay according to claim 2, characterized in that The first welding side surface part (211) and / or the second welding side surface part (212) is a bevel, and the gap (10a) decreases along a direction in which the first welding side surface part (211) and the second welding side surface part (212) approach each other.

4. The high-voltage DC relay according to claim 2, characterized in that The first welding side surface part (211) and / or the second welding side surface part (212) is a circular-arc convex surface or a curved convex surface, and the gap (10a) decreases along a direction in which the first welding side surface part (211) and the second welding side surface part (212) approach each other.

5. The high-voltage DC relay of claim 2, wherein, The second welding side surface part (212) has the same structure as the first welding side surface part (211).

6. The high-voltage DC relay of claim 2, wherein, The second welding surface (210) further comprises an abutting part (213) between the first welding side surface part (211) and the second welding side surface part (212), and the abutting part (213) abuts against the first welding surface (110).

7. The high-voltage DC relay according to claim 1, characterized in that The welding piece (200) has a welding end (200a) close to the insulating cover (100), a surface of the welding end (200a) is the second welding surface (210), and the welding end (200a) is a flange structure extending outward or inward, so that an included angle between an inner circumferential surface or an outer circumferential surface of the welding end (200a) and the first welding surface (110) forms the gap (10a).

8. The high-voltage DC relay according to any one of claims 1 to 7, characterized in that The welding piece (200) is a static contact (201), the static contact (201) comprises a contact part (2011) and a mounting part (2012), the contact part (2011) is inserted into the insulating cover (100) and can be in contact with a moving spring piece (300), the mounting part (2012) is annularly arranged on the contact part (2011) and is located outside the insulating cover (100), wherein a top surface of the insulating cover (100) is the first welding surface (110), and a surface of the mounting part (2012) facing the top surface of the insulating cover (100) is the second welding surface (210).

9. The high-voltage DC relay according to claim 8, characterized in that The mounting part (2012) is spaced from the contact part (2011) by an annular space (10b) near an end of the insulating cover (100).

10. The high-voltage DC relay according to any one of claims 1 to 7, characterized in that The welding piece (200) is a frame piece (202), wherein a bottom surface of the insulating cover (100) is the first welding surface (110), and a surface of the frame piece (202) facing and close to the bottom surface of the insulating cover (100) is the second welding surface (210).

11. The high-voltage DC relay according to claim 10, characterized in that The frame piece (202) comprises a first assembly part (2021) and a second assembly part (2022) connected to each other, the first assembly part (2021) is connected to the insulating cover (100), and the second assembly part (2022) extends from the first assembly part (2021) in a direction away from a central axis (M) of the insulating cover (100), and the second assembly part (2022) is connected to a yoke plate (400).

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