High-voltage direct-current relay

Abstract

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a pushing seat; a movable spring mechanism; the flat spring is positioned between the pushing seat and the movable spring mechanism and comprises a base part and a spring arm connected to the base part, the base part is arranged on the pushing seat, the spring arm is in contact with the movable spring mechanism, the base part comprises a fixed part and a convex structure connected between the fixed part and the spring arm, and the convex structure is in contact with the fixed part. The fixing part is connected to the pushing base, the protruding structure protrudes towards the side where the pushing base is located relative to the fixing part, and the surface of the side, opposite to the spring arm, of the protruding structure abuts against the pushing base. According to the high-voltage direct-current relay, stress at the abutting position of the protruding structure and the pushing base can be reduced, the risk that the fixing part arches and deforms to be damaged or disengaged from the pushing base due to the fact that the stress is conducted to the fixing part is reduced, and the structural reliability of the high-voltage direct-current relay can be improved.

Description

Technical Field

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

[0002] High-voltage DC relays, as a new type of automatic electrical switch, can achieve normally open or normally closed states through electromagnetic holding force. Current high-voltage DC relays typically consist of an electromagnetic component, a moving component, and a stationary contact. The moving contact on the moving spring mechanism of the moving component and the stationary contact on the stationary contact together form the contact part of the high-voltage DC relay. The electromagnetic component includes a coil, an upper iron core, and a lower iron core. When the coil is energized, it magnetizes the lower iron core, causing the lower iron core to attract the upper iron core, thereby driving the moving component closer to the stationary contact until the moving contact on the moving component and the stationary contact on the stationary contact make contact, thus completing the circuit.

[0003] In a moving spring mechanism, an elastic element is usually provided between the push seat of the push mechanism and the moving spring mechanism to provide elastic support for the moving spring mechanism. However, when the push seat and the moving spring mechanism are relatively close and squeeze the elastic element, the elastic element is easily deformed and damaged by the stress generated by the squeezing. Utility Model Content

[0004] Therefore, it is necessary to provide a high-voltage DC relay to address the problem that the elastic elements in relays are easily deformed and damaged by the stress generated by compression.

[0005] A high-voltage DC relay, comprising:

[0006] Push seat;

[0007] Moving spring mechanism; and,

[0008] A leaf spring is located between the push seat and the moving spring mechanism, and includes a base and a spring arm connected to the base. The base is disposed on the push seat, and the spring arm contacts the moving spring mechanism. The base includes a fixed part and a protruding structure connected between the fixed part and the spring arm. The fixed part is connected to the push seat, and the protruding structure protrudes relative to the fixed part toward the side where the push seat is located. The side surface of the protruding structure opposite to the spring arm abuts against the push seat.

[0009] In the aforementioned high-voltage DC relay, when the push base and the moving spring mechanism are relatively close and compress the leaf spring, causing the leaf spring to generate stress transmitted from the spring arm to the fixed part of the base, the inner surface of the protruding structure of the base abuts against the push base. This can reduce stress at the abutment point between the protruding structure and the push base, reducing the risk of stress transmission to the fixed part causing it to arch and deform, resulting in damage or detachment from the push base. This is beneficial to improving the structural reliability of the high-voltage DC relay.

[0010] In one embodiment, the leaf spring has two spring arms, which are connected to the two ends of the base in a one-to-one correspondence. The base is provided with two protruding structures, which are connected to the two ends of the fixing part. The inner surfaces of the two protruding structures abut against the push seat.

[0011] In one embodiment, the push seat has two spaced grooves on the side facing the moving spring mechanism, and the two protrusions are embedded in the two grooves in a one-to-one correspondence. The inner surfaces of the two protrusions facing each other and the outer surfaces facing away from each other are all in contact with the groove wall.

[0012] In one embodiment, the protrusion is shaped as a convex arc facing the push seat, and the groove wall is shaped as a concave arc that conforms to the shape of the protrusion.

[0013] In one embodiment, the push seat is provided with a mating structure protruding toward the moving spring mechanism. The protruding structure and the fixing part together form a mating groove recessed toward the push seat. The mating structure is embedded in the mating groove, and the inner surfaces of the two protruding structures abut against the two opposite sides of the mating structure.

[0014] In one embodiment, the surface of the fixing part facing the push seat is attached to the push seat, and the high voltage DC relay further includes a support element, which is fixedly disposed on the side of the fixing part facing away from the push seat and is attached to the surface of the fixing part facing away from the push seat.

[0015] In one embodiment, the moving spring mechanism is provided with a moving contact, and the high-voltage DC relay further includes a stationary contact, which is provided with a stationary contact opposite to the moving contact. The support element includes a connecting portion and a stop portion connected to the connecting portion on the side away from the push seat. The connecting portion is attached to and connected to the fixing portion. When the moving contact and the stationary contact spring apart under the action of a short-circuit current, the end of the stop portion away from the connecting portion is used to abut against the moving spring mechanism on the path of the moving spring mechanism moving towards the push seat.

[0016] In one embodiment, the support element is provided with two stop portions, which are spaced apart in the direction of the vertical connection between the two spring arms.

[0017] In one embodiment, the moving spring mechanism includes a moving spring and a lower armature. The moving contact is located on the side of the moving spring facing the stationary contact. The lower armature is fixed relative to the moving spring. Both ends of the moving spring protrude from the lower armature. The two spring arms abut against the two ends of the moving spring protruding from the lower armature. The stop portion is opposite to the lower armature.

[0018] In one embodiment, the high-voltage DC relay further includes two first arms, which are located on opposite sides of the moving spring mechanism relative to the push seat in the direction of movement. The first arms are fixed relative to the push seat and slidably engaged with the moving spring mechanism. The high-voltage DC relay also includes an upper armature opposite to the lower armature.

[0019] Wherein, the upper armature is located on the side of the moving spring mechanism opposite to the push seat and is fixed relative to the stationary contact; or,

[0020] The high-voltage DC relay also includes a second arm connected to the two first arms. The second arm is located on the side of the moving spring mechanism facing away from the push seat, and the upper armature is fixed to the second arm.

[0021] In one embodiment, the push seat can drive the moving spring mechanism to move toward the stationary contact, so that the high-voltage DC relay has a first state and a second state. In the first state, the moving contact is in contact with the stationary contact. In the second state, the moving contact is pressed against the stationary contact by the leaf spring. During the switching from the first state to the second state, the push seat moves toward the stationary contact relative to the moving spring mechanism. The distance between the stop portion and the moving spring mechanism is smaller in the second state than in the first state.

[0022] In one embodiment, in the second state, the difference between the dimension of the spring arm in the direction of motion of the moving spring mechanism relative to the push seat and the limit compression length of the spring arm is greater than the distance between the stop portion and the moving spring mechanism.

[0023] In one embodiment, the moving spring mechanism is able to spring away from the stationary contact under the electric repulsive force generated by the short-circuit current, so that the high-voltage DC relay switches from the second state to the third state. In the third state, the stop portion abuts against the moving spring mechanism to prevent the moving spring mechanism from getting close to the push seat. The dimension of the spring arm in the direction of movement of the moving spring mechanism relative to the push mechanism is greater than the limit compression length of the spring arm.

[0024] In one embodiment, the high-voltage DC relay further includes an electromagnetic component and a push rod connected to the side of the push seat facing away from the moving spring mechanism. The electromagnetic component can drive the push seat to move towards or away from the stationary contact via the push rod.

[0025] In one embodiment, multiple leaf springs are provided, and the multiple leaf springs are arranged side by side and spaced apart from each other or connected to each other in sequence; and / or,

[0026] The protruding structure is formed by bending the base portion. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the relay structure in some embodiments.

[0028] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the relay along the AA direction.

[0029] Figure 3 This is a schematic diagram of the structure of the moving component in some embodiments.

[0030] Figure 4 This is an exploded schematic diagram of the moving component in some embodiments.

[0031] Figure 5 This is a cross-sectional schematic diagram of the moving component in some embodiments.

[0032] Figure 6 for Figure 5 The diagram shows the structure of the elastic mechanism in the moving component.

[0033] Figure 7 for Figure 6 The diagram shows the structure of the elastic mechanism from another angle.

[0034] Figure 8 This is a cross-sectional schematic diagram of the moving component in some other embodiments.

[0035] Figure 9 for Figure 8 The diagram shows the structure of the elastic mechanism and support element in the moving assembly.

[0036] Figure 10 for Figure 8 The diagram shows the structure of the elastic mechanism in the moving component.

[0037] Figure 11 This is a schematic diagram of the relay in a first state in some embodiments.

[0038] Figure 12 This is a schematic diagram of the relay in the second state in some embodiments.

[0039] Figure 13 This is a schematic diagram of the relay in a third state in some embodiments.

[0040] Figure label:

[0041] 10. High-voltage DC relay; 11. Yoke plate; 12. Electromagnetic assembly; 121. Upper iron core; 122. Lower iron core; 13. Moving assembly; 131. Moving spring mechanism; 1311. Moving spring; 1313. Moving contact; 1314. Lower armature; 132. Elastic mechanism; 1320. Leaf spring; 1321. Base; 1322. Spring arm; 1323. Fixing part; 1324. Protruding structure; 1325. Inner side Surface; 1326, outer surface; 1327, mating groove; 133, pushing mechanism; 1331, pushing seat; 1332, pushing rod; 1333, groove; 1334, mating structure; 1351, first arm; 1352, second arm; 136, supporting element; 1361, connecting part; 1362, stopping part; 14, stationary contact; 141, stationary contact point; 142, insulating cover; 143, upper armature. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] As high-voltage DC relays are increasingly used in various fields, the industry's requirements for their heat loss resistance, short-circuit protection, and voltage are also becoming more stringent. Specifically, the current and voltage of the circuits in which high-voltage DC relays are used are increasing. For example, in new energy vehicles, as the required driving range increases, the capacity of battery packs in these vehicles is also increasing, leading to higher current and voltage requirements for the high-voltage DC relays used in the battery pack circuits. Therefore, when the circuit is short-circuited or overloaded, the electro-repulsive force generated between the moving and stationary contacts of the high-voltage DC relay is relatively large, which can easily cause the moving and stationary contacts to spring apart by a large distance. For example, the moving and stationary contacts may spring apart to the point where the moving spring mechanism compresses the elastic mechanism to its limit, and then the impact force is transmitted to the pushing mechanism and the electromagnetic component. At this point, the impact force is too large, which can easily cause the electromagnetic component and the moving component to detach from the stationary contact, resulting in damage to the high-voltage DC relay. Alternatively, the distance between the moving and stationary contacts may be too far, leading to arcing between the moving and stationary contacts, generating excessive heat and burning out the high-voltage DC relay, or even causing the high-voltage DC relay to explode. However, in traditional high-voltage DC relays, to increase the holding force of the electromagnetic component on the moving component to reduce the risk of insufficient holding force causing the electromagnetic component to detach from the stationary contact, or to reduce the spring distance between the moving and stationary contacts, it is usually necessary to increase the number of turns of the coil winding. This increases the cost and size of the electromagnetic component, thus increasing the size and cost of the high-voltage DC relay.

[0049] In addition, when the moving spring mechanism and the pushing mechanism are elastically engaged by an elastic mechanism with a leaf spring, the base of the leaf spring is fixedly connected to the pushing mechanism. If the moving spring mechanism and the pushing mechanism get close to each other and squeeze the leaf spring, the spring arm of the leaf spring will undergo elastic deformation. The leaf spring will generate stress transmitted from the spring arm to the middle part of the base, which can easily cause the base to arch and deform or even detach from the pushing mechanism and be damaged.

[0050] To address the aforementioned problems, this application provides a high-voltage DC relay.

[0051] Please see Figures 1-4 , Figure 1 This is a schematic diagram of the structure of the high-voltage DC relay 10 in some embodiments. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the high-voltage DC relay 10 along the AA direction. Figure 3 and Figure 4 They are respectively Figure 2 The diagram shows the structure and exploded view of the moving component 13 in the high-voltage DC relay 10. Figure 2The high-voltage DC relay 10 shown is in its initial state. In some embodiments, the high-voltage DC relay 10 includes a yoke plate 11, an electromagnetic component 12, a moving component 13, stationary contacts 14, and an insulating cover 142. The insulating cover 142 is disposed on the yoke plate 11, and the stationary contacts 14 are disposed on the insulating cover 142. Two stationary contacts 14 may be spaced apart, and each stationary contact 14 has a stationary contact point 141. The insulating cover 142 includes, but is not limited to, an insulating housing such as a ceramic cover. The moving component 13 includes a moving spring mechanism 131, an elastic mechanism 132, and a pushing mechanism 133. The moving spring mechanism 131 has two moving contacts 1313 that are one-to-one opposite to the two stationary contacts 141. The moving spring mechanism 131 elastically cooperates with the pushing mechanism 133 through the elastic mechanism 132. That is, the moving spring mechanism 131 can move towards the pushing mechanism 133 to jointly compress the elastic mechanism 132 with the pushing mechanism 133, and can also move away from the pushing mechanism 133 to release the elastic mechanism 132. The electromagnetic component 12 is located on the side of the yoke plate 11 facing away from the moving spring mechanism 131. It can drive the pushing mechanism 133 to move, causing the moving component 13 as a whole to move towards or away from the stationary contact 141, so that the moving contact 1313 contacts the stationary contact 141 to realize the circuit is connected, or the moving contact 1313 disengages from the stationary contact 141 to realize the circuit is disconnected.

[0052] It is understood that the high-voltage DC relay 10 can be used as a switching element in a circuit. The stationary contact 14 may have a lead-out terminal electrically connected to the two stationary contacts 141, and the lead-out terminal is electrically connected to the circuit. When the moving contact 1313 and the stationary contact 141 are in contact one by one, the moving contact 1313 conducts the two stationary contacts 141 to make the circuit conduct, and the high-voltage DC relay 10 is turned on. When the moving contact 1313 is disengaged from the stationary contact 141, the two stationary contacts 141 are electrically isolated, the circuit is broken, and the high-voltage DC relay 10 is turned off. In some embodiments, the high-voltage DC relay 10 may also include a housing (not shown) covering the insulating cover 142 and the stationary contact 14. The stationary contact 14 can be led out to the outside of the housing through conductive structures such as electrodes and leads to be electrically connected to the circuit. The material of the housing includes, but is not limited to, insulating materials such as plastic. The housing can isolate the stationary contact 14, the insulating cover 142 and the moving component 13 from the outside world to achieve insulation protection.

[0053] In some embodiments, the pushing mechanism 133 includes a pushing seat 1331 and a pushing rod 1332 connected to the side of the pushing seat 1331 facing away from the moving spring mechanism 131. The electromagnetic assembly 12 may include an upper iron core 121, a lower iron core 122, and a coil (not shown) surrounding the upper iron core 121 and the lower iron core 122. The upper iron core 121 is fixedly mounted on the yoke plate 11, and the coil is fixed relative to the yoke plate 11. The lower iron core 122 is opposite to the upper iron core 121 and located on the side of the upper iron core 121 facing away from the yoke plate 11. The lower iron core 122 is movable relative to the yoke plate 11 in a direction closer to or farther from the upper iron core 121. The pushing rod 1332 passes through the upper iron core 121 and is inserted into the lower iron core 122. The pushing rod 1332 is slidably engaged with the upper iron core 121 and fixedly connected to the lower iron core 122. When the coil is energized, it can magnetize the upper iron core 121 and the lower iron core 122, causing the upper iron core 121 and the lower iron core 122 to attract each other and drive the lower iron core 122 to move closer to the upper iron core 121, thereby driving the push rod 1332 to drive the entire moving assembly 13 to move closer to the stationary contact 141.

[0054] In some embodiments, the moving assembly 13 further includes two first arms 1351, which are located on opposite sides of the moving spring mechanism 131 in the direction of movement relative to the pushing mechanism 133, and are directly or indirectly connected to the pushing seat 1331. The two first arms 1351 slide against the moving spring mechanism 131 on opposite sides to limit the movement of the moving spring mechanism 131 relative to the pushing seat 1331 in the direction of approaching or moving away from the stationary contact 141. When the moving spring mechanism 131 and the pushing seat 1331 are relatively close, the moving spring mechanism 131 and the pushing seat 1331 can compress the elastic mechanism 132, causing the elastic mechanism 132 to undergo elastic deformation. The sliding limitation of the moving spring mechanism 131 by the two first arms 1351 can guide the movement of the moving spring mechanism 131 relative to the pushing seat 1331, improving the performance stability of the high-voltage DC relay 10.

[0055] In some embodiments, the moving assembly 13 may further include a second arm 1352 connected to the two first arms 1351. The second arm 1352 may be disposed on the side of the moving spring mechanism 131 facing away from the push mechanism 133 and located between the moving spring mechanism 131 and the insulating cover 142. The second arm 1352 can limit the extreme position of the moving spring mechanism 131 away from the push seat 1331 on the side of the moving spring mechanism 131 facing the stationary contact 141, preventing the moving spring mechanism 131 from disengaging from the elastic mechanism 132 and the push seat 1331, thereby improving the performance stability of the high-voltage DC relay 10.

[0056] In some embodiments, the moving spring mechanism 131 includes a moving spring 1311 and a lower armature 1314 fixedly connected to the moving spring 1311. The high-voltage DC relay 10 also includes an upper armature 143 opposite to the lower armature 1314. The moving contact 1313 is located on the side of the moving spring 1311 facing the stationary contact 14, and the upper armature 143 is located on the side of the lower armature 1314 facing away from the push seat 1331. The upper armature 143 and the lower armature 1314 together form an anti-short-circuit ring structure. When the moving contact 1313 and the stationary contact 141 come into contact, the magnetic field generated by the moving spring 1311 and the stationary contact 14 can magnetize the upper armature 143 and the lower armature 1314, so that the upper armature 143 and the lower armature 1314 attract each other, which can provide a holding force for the contact between the moving contact 1313 and the stationary contact 141. This is beneficial to reducing the holding force required by the electromagnetic component 12, and is beneficial to reducing the cost and size of the electromagnetic component 12.

[0057] exist Figure 2 In the illustrated embodiment, the upper armature 143 is disposed outside the moving assembly 13 and fixed relative to the stationary contact 14. For example, the upper armature 143 can be disposed on the insulating cover 142. The upper armature 143 is disposed corresponding to the stationary contact 141 and located between the insulating cover 142 and the second arm 1352. The upper armature 143 is located on the side of the moving spring mechanism 131 facing away from the push seat 1331. The moving assembly 13 may also not be provided with the second arm 1352. In this case, the upper armature 143 is located between the insulating cover 142 and the moving spring 1311. When the moving assembly 13 is not provided with the second arm 1352, the upper armature 143 can limit the moving spring mechanism 131 on the side of the moving spring mechanism 131 facing away from the push seat 1331, limiting the moving spring mechanism 131 to the extreme position away from the push seat 1331. In some embodiments, an insulating cover 142 is disposed over the moving assembly 13 and on the yoke plate 11. The stationary contact 14 and the upper armature 143 are both fixedly disposed on the insulating cover 142. The stationary contact 14 extends out of the insulating cover 142, facing away from the moving spring mechanism 131. In other embodiments, when the moving assembly 13 is provided with a second arm 1352, the upper armature 143 can also be fixed to the second arm 1352 and located between the second arm 1352 and the moving spring mechanism 131.

[0058] Furthermore, combined Figure 5 , Figure 6 and Figure 7As shown, in some embodiments, the elastic mechanism 132 is provided with a leaf spring 1320, which is located between the push seat 1331 and the movable spring mechanism 131. The leaf spring 1320 includes a base 1321 and spring arms 1322 connected to both ends of the base 1321. The base 1321 is fixedly disposed on the push seat 1331, and the two spring arms 1322 abut against the side of the movable spring mechanism 131 facing the push seat 1331 to achieve an elastic fit between the movable spring mechanism 131 and the push seat 1331. The two spring arms 1322 can be fixedly connected to the movable spring mechanism 131 to reduce the risk of the movable spring mechanism 131 disengaging from the elastic mechanism 132 and improve structural reliability. Of course, the spring arm 1322 can also achieve elastic engagement with the moving spring mechanism 131 by means of elastic force, without being fixedly connected to the moving spring mechanism 131. Alternatively, the spring arm 1322 can also be movablely connected to the moving spring mechanism 131 with a certain amount of movement, as long as elastic engagement between the moving spring mechanism 131 and the push seat 1331 can be achieved. This application does not impose any limitations. The base 1321 includes a fixed part 1323 and two protruding structures 1324 connected to both ends of the fixed part 1323. The fixed part 1323 can be the middle part of the base 1321. The fixed part 1323 is fixedly connected to the push seat 1331. The two protruding structures 1324 protrude relative to the fixed part 1323 toward the side where the push seat 1331 is located. The inner surfaces 1325 of the two protruding structures 1324 abut against the push seat 1331.

[0059] In the aforementioned high-voltage DC relay 10, when the push base 1331 and the moving spring mechanism 131 are relatively close and compress the leaf spring 1320, causing the leaf spring 1320 to generate stress transmitted from the two spring arms 1322 to the fixing part 1323 of the base 1321, the inner surfaces 1325 of the two protruding structures 1324 of the base 1321 abut against the push base 1331. When the stress is transmitted to the abutting point between the inner surfaces 1325 of the protruding structures 1324 and the push base 1331, the inner surfaces 1325 of the protruding structures 1324 and the push base 1331 can be squeezed against each other. This reduces the stress at the abutting point between the protruding structures 1324 and the push base 1331, reducing the risk that the stress will be transmitted to the fixing part 1323 and cause it to arch and deform, resulting in damage or detachment from the push base 1331. This is beneficial to improving the structural reliability of the high-voltage DC relay 10. It should be noted that when the extension direction of the fixed part 1323 is perpendicular to the relative movement direction of the moving spring mechanism 131 and the push seat 1331, the inner surface 1325 of the protrusion structure 1324 that abuts against the push seat 1331 is inclined or perpendicular to the extension direction of the fixed part 1323, so that the fixed part 1323 is not easily deformed by arching during the process of the protrusion structure 1324 and the push seat 1331 pressing against each other to offset the stress.

[0060] The arrangement of the leaf spring 1320 and the push seat 1331 is not limited, as long as it can offset the stress generated by the compression of the leaf spring 1320 by the moving spring mechanism 131 and the push seat 1331. In some embodiments, the push seat 1331 has two spaced grooves 1333 on the side facing the moving spring mechanism 131, and two protrusions 1324 correspond one-to-one with the two grooves 1333. Each protrusion 1324 is embedded in a corresponding groove 1333, and the opposing inner surfaces 1325 and the opposing outer surfaces 1326 of the two protrusions 1324 are all in contact with the sidewall of the groove 1333. The sidewall of the groove 1333 is fitted with the inner surface 1325 and the outer surface 1326 of the protrusion 1324, so that the protrusion 1324 can adapt to the deformation of the spring arm 1322 when the leaf spring 1320 is compressed, increasing the size of the part of the leaf spring 1320 outside the push seat 1331, making the lever arm of the spring arm 1322 longer, which helps to reduce the stress on the spring arm 1322 and improve the structural reliability of the spring arm 1322.

[0061] In some embodiments, the protrusion 1324 is shaped as a convex arc facing the push seat 1331, and the groove wall of the groove 1333 is shaped as a concave arc to match the shape of the protrusion 1324. Therefore, the contact transition between the protrusion 1324 and the groove wall of the groove 1333 is smoother, and the protrusion 1324 more easily adapts to the deformation of the spring arm 1322 when the leaf spring 1320 is compressed, reducing the stress on the spring arm 1322 and lowering the risk of damage to the spring arm 1322.

[0062] Please see Figure 8 , Figure 9 and Figure 10As shown, in some embodiments, the push seat 1331 is provided with a mating structure 1334 protruding towards the moving spring mechanism 131. The protruding structure 1324 of the base 1321 and the fixing part 1323 together form a mating groove 1327 concave towards the push seat 1331. The mating structure 1334 is embedded in the mating groove 1327, and the inner surfaces 1325 of the two protruding structures 1324 abut against the opposite sides of the mating structure 1334. With this arrangement, the abutting and pressing action between the inner surfaces 1325 of the protruding structures 1324 and the opposite sides of the mating structure 1334 can effectively offset the stress transmitted to the base 1321, reducing the risk of the leaf spring 1320 arching and deforming due to stress. At the same time, it also helps to simplify the structural design of the push seat 1331 and reduce the manufacturing difficulty of the push seat 1331. In this embodiment, the inner surface 1325 of the protruding structure 1324 can be approximately perpendicular to the extending direction of the fixing part 1323, which can effectively reduce the risk of stress transmission to the fixing part 1323 by changing the direction of force. In some embodiments, the surface of the protruding structure 1324 facing the push seat 1331 can abut against the surface of the push seat 1331 facing the moving spring mechanism 131 outside the mating structure 1334. The surface of the protruding structure 1324 facing the push seat 1331 can be inclined or approximately perpendicular to the inner surface 1325 of the protruding structure 1324. Thus, both parts of the protruding structure 1324 forming an included angle are in contact with the push seat 1331, which can fully offset the stress by pressing with the push seat 1331 and improve the structural reliability.

[0063] In some embodiments, the surface of the fixing part 1323 facing the push base 1331 is attached to the push base 1331. The high-voltage DC relay 10 also includes a support element 136, which is fixedly disposed on the side of the fixing part 1323 facing away from the push base 1331 and is attached to the surface of the fixing part 1323 facing away from the push base 1331. Thus, the support element 136 can provide pressing, limiting and reinforcement for the fixing part 1323, which also helps to reduce the risk of the fixing part 1323 arching and deforming due to stress, effectively improving the structural reliability of the high-voltage DC relay 10.

[0064] In some embodiments, the elastic mechanism 132 includes a plurality of leaf springs 1320, which are arranged side by side. The number of leaf springs 1320 can be two, three, four or more. Figure 6 and Figure 7 In the illustrated embodiment, taking the elastic mechanism 132 with three leaf springs 1320 as an example, the fixing portions 1323 of two adjacent leaf springs 1320 can be connected to each other. (Refer to 9 and...) Figure 10As shown, in some embodiments, the individual leaf springs 1320 may also be spaced apart. Providing multiple leaf springs 1320 simultaneously to provide elastic support for the moving spring mechanism 131 improves structural and performance reliability. The support element 136 can cover the fixing portion 1323 of the multiple leaf springs 1320 to provide reinforcement and protection for them simultaneously. Combined with the arrangement where the inner surface 1325 of the protruding structure 1324 of the multiple leaf springs 1320 abuts against the push seat 1331, the risk of deformation and damage to the leaf springs 1320 due to stress is effectively reduced. The connection method among the push seat 1331, the base 1321 of the leaf springs 1320, and the support element 136 includes, but is not limited to, riveting, gluing, fastening, or any suitable connection method.

[0065] In one embodiment, the spring arm 1322 and the base 1321 of the leaf spring 1320 are integral structures. The fixing part 1323 and the protruding structure 1324 in the base 1321 are also integral structures. For example, the spring arm 1322, the protruding structure 1324, and the fixing part 1323 can be formed by bending different parts of the spring structure. This reduces the impact of stress on the structural reliability of the leaf spring 1320, simplifies its structure, and reduces its manufacturing difficulty and cost.

[0066] Please see again. Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, when the moving contact 1313 and the stationary contact 141 spring apart under the action of a short-circuit current, the support element 136 is used to abut against the moving spring mechanism 131 on the path in which the moving spring mechanism 131 moves toward the push seat 1331. It is understood that when the support element 136 abuts against the moving spring mechanism 131, the support element 136 can prevent the moving spring mechanism 131 and the push seat 1331 from continuing to move closer to each other. In some embodiments, the direction of movement of the moving spring mechanism 131 away from the stationary contact 14 is the same as the direction of movement toward the push seat 1331. It should be noted that the support element 136 can be opposite to one of the moving spring 1311 and the lower armature 1314 of the moving spring mechanism 131, so that it abuts against one of the moving spring 1311 and the lower armature 1314 on the path of the moving spring mechanism 131 moving toward the push seat 1331. Alternatively, it can be opposite to both the moving spring 1311 and the lower armature 1314, so that it can abut against both the moving spring 1311 and the lower armature 1314 at the same time, as long as it can achieve the supporting function of the moving spring mechanism 131.

[0067] refer to Figure 2As shown in this application, the state in which the moving contact 1313 and the stationary contact 141 are spaced apart, and the electromagnetic component 12 does not apply force to the push rod 1332, and the high-voltage DC relay 10 disconnects the circuit, is called the initial state of the high-voltage DC relay 10. In the initial state, the support element 136 is spaced apart from the moving spring mechanism 131. When it is necessary to bring the moving contact 1313 and the stationary contact 141 into contact to conduct the circuit, the coil in the electromagnetic component 12 is energized, and the lower iron core 122 moves towards the upper iron core 121, which drives the push rod 1332 to drive the push seat 1331, thereby driving the moving spring mechanism 131 towards the stationary contact 141, so that the moving component 13 has a first state and a second state. Please refer to Figure 11 As shown, when the moving component 13 moves to the first state, the moving contact 1313 is in contact with the stationary contact 141, and the high-voltage DC relay 10 conducts the circuit. In the first state, the length of the spring arm 1322 in the direction of movement of the moving spring mechanism 131 relative to the push seat 1331 is the same as its length in the initial state. That is to say, in the process of the push mechanism 133 driving the moving spring mechanism 131 to move towards the stationary contact 141 to switch from the initial state to the first state, the moving spring mechanism 131, the first support arm 1351, the elastic mechanism 132, and the push mechanism 133 move synchronously.

[0068] Please see Figure 12As shown, after the electromagnetic component 12 drives the moving spring mechanism 131 to move to the first state via the pushing mechanism 133, the electromagnetic component 12 can continue to drive the pushing mechanism 133 to move towards the stationary contact 141 to the second state. During the transition from the first state to the second state, since the moving contact 1313 is in contact with the stationary contact 141, the moving spring mechanism 131 and the stationary contact 141 are relatively fixed, and the pushing mechanism 133 continues to move towards the stationary contact 141, which will cause the distance between the pushing seat 1331 and the moving spring mechanism 131 to decrease. That is to say, during the transition from the first state to the second state, the moving spring mechanism 131 and the pushing seat 1331 are relatively close. The relative closeness between the moving spring mechanism 131 and the pushing seat 1331 will compress the elastic mechanism 132, causing the length of the spring arm 1322 in the direction of movement of the moving spring mechanism 131 relative to the pushing seat 1331 to decrease, and the spring arm 1322 undergoes elastic deformation. Understandably, in both the first and second states, the moving contact 1313 is in contact with the stationary contact 141. In the second state, the elastic mechanism 132 applies an elastic force to the moving spring mechanism 131 to press the moving contact 1313 firmly against the stationary contact 14, improving the stability and reliability of the contact between the moving contact 1313 and the stationary contact 141. Simultaneously, the elastic mechanism 132, in conjunction with the electromagnetic component 12, can counteract at least part of the electrodynamic repulsion between the moving contact 1313 and the stationary contact 141, which helps reduce the holding force required by the high-voltage DC relay 10 for the electromagnetic component 12, and consequently reduces the cost and size of the electromagnetic component 12.

[0069] It is understandable that during the transition from the initial state to the first state, and during the transition from the first state to the second state, the lower iron core 122 gradually approaches the upper iron core 121. In the first state, the lower iron core 122 and the upper iron core 121 are spaced apart. In the second state, the lower iron core 122 can just make contact with the upper iron core 121, which is beneficial to enhance the magnetic attraction between the upper iron core 121 and the lower iron core 122 in the second state, thereby enhancing the holding force of the electromagnetic component 12 on the moving component 13.

[0070] In some embodiments, the structure and position of the support element 136 are designed such that, in the second state, the support element 136 remains spaced from the moving spring mechanism 131, and the distance between the support element 136 and the moving spring mechanism 131 is smaller in the second state than in the first state. Furthermore, in the second state, the difference between the dimension of the spring arm 1322 in the direction of movement of the moving spring mechanism 131 relative to the push seat 1331 and the ultimate compression length of the spring arm 1322 is greater than the distance between the support element 136 and the moving spring mechanism 131. This ensures that when the support element 136 abuts against the moving spring mechanism 131, the dimension of the spring arm 1322 in the direction of movement of the moving spring mechanism 131 relative to the push seat 1331 is greater than the ultimate compression length; in other words, the spring arm 1322 will not be compressed to its ultimate compression length. In some embodiments, the length of the spring arm 1322 in the direction of movement of the moving spring mechanism 131 relative to the push seat 1331 can be equal to the vertical distance between the moving spring mechanism 131 and the push seat 1331.

[0071] Combination Figure 13 As shown, it is understandable that when the circuit is short-circuited or overloaded, taking the current exceeding 8kA as an example in this application, the electrodynamic repulsion between the moving contact 1313 and the stationary contact 141 is greater than the elastic force exerted by the elastic mechanism 132 on the moving spring mechanism 131, causing the moving contact 1313 to spring away from the stationary contact 141. This causes the moving spring mechanism 131 to move towards the push seat 1331 and further compress the spring arm 1322 until the support element 136 abuts against the moving spring mechanism 131. At this time, the support element 136 provides support for the moving spring mechanism 131, preventing the moving spring mechanism 131 from moving towards the push seat 1331 relative to the stationary contact 14. In this application, the state in which the support element 136 abuts against the moving spring mechanism 131 to provide support for the moving spring mechanism 131 is called the third state of the high voltage DC relay 10. In the third state, the moving spring mechanism 131, the first support arm 1351 and the push mechanism 133 are relatively fixed, and the electromagnetic component 12 bears the impact force of the moving spring mechanism 131.

[0072] When the circuit connected to the high-voltage DC relay 10 is short-circuited or overloaded, causing the moving contact 1313 of the moving spring mechanism 131 and the stationary contact 141 of the stationary contact 14 to spring open due to electric repulsion, the moving spring mechanism 131 can first compress the elastic mechanism 132 until the support element 136 abuts against the moving spring mechanism 131 to prevent the moving spring mechanism 131 and the pushing mechanism 133 from continuing to get closer to each other. Since the electric repulsion between the moving contact 1313 and the stationary contact 141 disappears after the moving contact 1313 and the stationary contact 141 spring open, the elastic mechanism 132 can effectively buffer the kinetic energy of the moving spring mechanism 131 during the process of the moving spring mechanism 131 moving away from the stationary contact 141 until the support element 136 abuts against the moving spring mechanism 131. Furthermore, due to the supporting effect of the support element 136 on the moving spring mechanism 131, the maximum spring-opening distance between the moving spring mechanism 131 and the stationary contact 141 can be shortened. This ensures that when the support element 136 abuts against the moving spring mechanism 131, the elastic mechanism 132 will not be compressed to its limit compression length, and the impact of the moving spring mechanism 131 on the pushing mechanism 133 will not be too great. This reduces the risk of the high-voltage DC relay 10 being damaged due to the moving component 13 completely detaching from the stationary contact 14 caused by excessive impact.

[0073] Furthermore, the contact between the support element 136 and the moving spring mechanism 131 prevents the moving spring mechanism 131 from moving further away from the stationary contact 141, which helps to reduce the relative spring-off distance between the moving contact 1313 and the stationary contact 141. Combined with the buffering effect of the elastic mechanism 132 to reduce the risk of the moving component 13 detaching from the stationary contact 14, the distance between the moving contact 1313 and the stationary contact 141 will not be too far. This helps to reduce the risk of excessive heat generated by arcing between the moving contact 1313 and the stationary contact 141, which could lead to damage or even explosion of the high-voltage DC relay 10. In addition, the buffering effect of the elastic mechanism 132 on the moving spring mechanism 131 also reduces the holding force required by the moving component 13 on the electromagnetic component 12, allowing the electromagnetic component 12 to support the entire moving component 13 with a smaller holding force. This helps to reduce the number of coil turns and / or the volume of the iron core of the electromagnetic component 12, which is beneficial for the low-cost and miniaturized design of the high-voltage DC relay 10. Furthermore, the support element 136 connected to the elastic mechanism 132 abuts against the moving spring mechanism 131 on the movement path of the moving spring mechanism 131. The support element 136 can simultaneously reduce the impact of shear force on the leaf spring 1320 and support the moving spring mechanism 131, which helps to reduce the number of components and assembly steps, simplify the structure and manufacturing process of the moving assembly 13, and also helps to achieve miniaturization and low cost of the high voltage DC relay 10.

[0074] Therefore, during the transition from the second state to the third state, the aforementioned high-voltage DC relay 10 first buffers the impact of the moving spring mechanism 131 through the elastic mechanism 132, and then the electromagnetic component 12 bears the impact of the moving spring mechanism 131. This helps reduce the holding force required by the electromagnetic component 12, reduces its cost and size, and also reduces the spring-opening distance between the moving contact 1313 and the stationary contact 141, thereby reducing the heat generated by the arcing phenomenon. The aforementioned high-voltage DC relay 10 achieves a balance between small size, low cost, and high resistance to short-circuit current and voltage. Based on this, the high-voltage DC relay 10 provided in this application can be used in circuits with high current, such as circuits with operating currents below 8kA. The high-voltage DC relay 10 includes, but is not limited to, applications in battery pack circuits of new energy vehicles. The high-voltage DC relay 10 can also be used as a switching element in circuits of any other applicable equipment, which will not be elaborated upon in this application.

[0075] It is understood that in this application, the support element 136 only contacts the moving spring mechanism 131 in the third state to provide support for the moving spring mechanism 131. In other states, the support element 136 will not interfere with the relative movement between the moving spring mechanism 131 and the push seat 1331. This helps to reduce the risk of the support element 136 causing other types of interference to the movement of the moving spring mechanism 131, such as sliding fit or limit fit, which would increase the risk of the moving spring mechanism 131 getting stuck, uneven force, or wear and scraping. While providing support, it also helps to maintain the structural reliability of the moving assembly 13 and reduce the impact of the support element 136 on the contact reliability of the moving assembly 13.

[0076] In some embodiments, the support element 136 includes a connecting portion 1361 connected to at least a portion of the base 1321 and a stop portion 1362 disposed on the side of the connecting portion 1361 facing away from the push seat 1331. The connecting portion 1361 13621 is used to limit the base 1321 and reduce the stress effect on the leaf spring 1320. The side of the stop portion 1362 away from the connecting portion 1361 is used to abut against the moving spring mechanism 131 on the path of the moving spring mechanism 131 moving towards the push seat. Providing the connecting portion 1361 can increase the connection area between the support element 136 and the base 1321 and improve the reliability of the connection. In some embodiments, the support element 136 has two stop portions 1362, which are spaced apart in the direction of the vertical line connecting the two spring arms 1322. The arrangement of the two spring arms 1322 can improve the stability of the moving spring mechanism 131 during its movement relative to the push seat 1331. The two stop parts 1362 cooperate with the two spring arms 1322 to improve the support stability of the moving spring mechanism 131 in the third state and prevent the moving spring mechanism 131 from swaying relative to the push seat 1331.

[0077] Furthermore, in some embodiments, the two ends of the movable spring 1311 protrude from the lower armature 1314. The extending direction of the movable spring 1311 can be approximately parallel to the vertical line connecting the two spring arms 1322. The two spring arms 1322 respectively abut against the two ends of the movable spring 1311 protruding from the lower armature 1314. The support element 136 is opposite to the lower armature 1314 to abut against the lower armature 1314. In this way, the layout between the movable spring 1311, the lower armature 1314, the elastic mechanism 132, and the support element 136 can be rationally planned, improving the structural compactness of the moving assembly 13 and reducing mutual interference between the components. This improves the space utilization efficiency of the moving assembly 13 while enhancing its structural stability and performance reliability.

[0078] In this application, the sliding engagement between the first arm 1351 and the moving spring mechanism 131 can be described as follows: the opposing sides of the lower armature 1314 can be in sliding engagement with the surfaces opposite to the two first arms 1351; the opposing sides of the moving spring 1311 can be in sliding engagement with the two first arms 1351; or a portion of the moving spring 1311 or the lower armature 1314 can be inserted into and slidably disposed on the first arm 1351, as long as the first arm 1351 can provide guidance and limiting function for the movement of the moving spring mechanism 131 relative to the push seat 1331. In some embodiments, the first arm 1351 can be directly connected to the push seat 1331, for example, integrally formed with the push seat 1331 by insert injection molding; or the first arm 1351 and the push seat 1331 can have an insertion relationship. The moving component 13 can also include a fixing piece connected to the first arm 1351 and the push seat 1331, indirectly connecting the first arm 1351 to the push seat 1331 through the fixing piece.

[0079] In the accompanying drawings of this application, the moving spring 1311 may include two sub-springs arranged side by side and spaced apart from each other. The lower armature 1314 may be connected to both sub-springs simultaneously. The lower armature 1314 may also include two spaced-apart sub-armatures, with each sub-armature corresponding to one of the two sub-springs. Thus, each moving contact 1313 of the moving spring 1311 can be formed by the corresponding positions of the two sub-springs. With this arrangement, the two sub-springs can provide more stable electrical contact, reduce poor contact caused by wear or damage to a single spring, share the mechanical load of the moving contact 1313, reduce the stress on a single spring, improve the durability of the high-voltage DC relay 10, and provide a more uniform current distribution, reducing arcing and contact resistance, and improving electrical contact performance. Furthermore, when one sub-spring fails, the other sub-spring can still achieve on / off control of the circuit with the stationary contact 141, improving the performance reliability of the high-voltage DC relay 10. In other embodiments, each sub-reed can also be provided with two moving contacts 1313, and each sub-reed can be used to conduct different circuits, so that the high-voltage DC relay 10 can be used as a switch for multiple circuits simultaneously. Of course, the moving reed 1311 can also be an integral reed structure. When the moving reed 1311 includes sub-reeds, the number of sub-reeds is not limited, and can be designed according to connection reliability and functional requirements.

[0080] 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.

[0081] 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 high-voltage DC relay comprises: a push base; a moving spring mechanism; and a leaf spring between the push base and the moving spring mechanism, comprising a base and spring arms connected to the base, the base is arranged on the push base, the spring arms are in contact with the moving spring mechanism, the base comprises a fixed part and a protruding structure connected between the fixed part and the spring arms, the fixed part is connected to the push base, the protruding structure protrudes towards the side of the push base, and the side surface of the protruding structure away from the spring arms abuts against the push base.

2. The high-voltage DC relay according to claim 1, characterized in that The leaf spring is provided with two spring arms, and the two spring arms are connected to the two ends of the base one by one, the base is provided with two protruding structures, and the two protruding structures are connected to the two ends of the fixed part, and the opposite inner side surfaces of the two protruding structures abut against the push base.

3. The high-voltage DC relay according to claim 2, characterized in that The push base is provided with two grooves spaced apart on the side towards the moving spring mechanism, and the two protruding structures are embedded in the two grooves one by one, and the opposite inner side surfaces and the opposite outer side surfaces of the two protruding structures are fitted to the groove walls of the grooves.

4. The high-voltage DC relay according to claim 3, characterized in that The shape of the protruding structure is a convex arc shape towards the push base, and the shape of the groove wall is a concave arc shape suitable for the shape of the protruding structure.

5. The high-voltage DC relay of claim 2, wherein, The push base is provided with a matching structure protruding towards the moving spring mechanism, the protruding structure and the fixed part jointly form a matching groove concave to the push base, the matching structure is embedded in the matching groove, and the opposite inner side surfaces of the two protruding structures abut against the two side surfaces of the matching structure away from each other.

6. The high-voltage DC relay according to any one of claims 1 to 5, characterized in that The surface of the fixed part towards the push base is fitted to the push base, and the high-voltage DC relay further comprises a supporting element, which is fixedly arranged on the side of the fixed part away from the push base and is fitted to the surface of the fixed part away from the push base.

7. The high-voltage DC relay according to claim 6, characterized in that The moving spring mechanism is provided with a moving contact, and the high-voltage DC relay further comprises a stationary contact provided with a stationary contact opposite to the moving contact, and the supporting element comprises a connecting part and a stop part connected to the side of the connecting part away from the push base, the connecting part is fitted to and connected to the fixed part, and when the moving contact and the stationary contact are separated under the action of a short-circuit current, the end of the stop part away from the connecting part is used to abut against the moving spring mechanism on the path of the moving spring mechanism moving towards the push base.

8. The high-voltage DC relay according to claim 7, characterized in that The supporting element is provided with two stop parts, and the two stop parts are arranged in a vertical line direction of the two spring arms.

9. The high-voltage DC relay according to claim 7, characterized in that The moving spring mechanism comprises a moving spring leaf and a lower armature, the moving contact is arranged on the side of the moving spring leaf towards the stationary contact, the lower armature is fixed opposite to the moving spring leaf, the two ends of the moving spring leaf protrude from the lower armature, the two spring arms abut against the two ends of the moving spring leaf protruding from the lower armature respectively, and the stop part is opposite to the lower armature.

10. The high-voltage DC relay according to claim 9, characterized in that The high-voltage DC relay further comprises two first arms, which are respectively located on two sides opposite to the movement direction of the moving spring mechanism relative to the pusher base, and are fixed relative to the pusher base and in sliding fit with the moving spring mechanism. The upper arm is arranged on the side of the moving spring mechanism away from the pusher base and is fixed relative to the static contact. The high-voltage DC relay further comprises a second arm connected to the two first arms, which is located on the side of the moving spring mechanism away from the pusher base, and the upper arm is fixed on the second arm.

11. The high-voltage DC relay of claim 7, wherein, The pusher base can drive the moving spring mechanism to move towards the static contact, so that the high-voltage DC relay has a first state and a second state, in the first state, the moving contact is just in contact with the static contact, in the second state, the moving contact is pressed against the static contact by the leaf spring, in the process of switching from the first state to the second state, the pusher base moves relative to the moving spring mechanism towards the static contact, the distance between the stop part and the moving spring mechanism in the second state is smaller than that in the first state.

12. The high-voltage DC relay according to claim 11, characterized in that In the second state, the difference between the dimension of the spring arm in the movement direction of the moving spring mechanism relative to the pusher base and the limit compression length of the spring arm is greater than the distance between the stop part and the moving spring mechanism.

13. The high-voltage DC relay of claim 11, wherein, The moving spring mechanism can be repelled relative to the static contact under the action of the electrodynamic repulsion generated by the short-circuit current, so that the high-voltage DC relay switches from the second state to a third state, in the third state, the stop part abuts against the moving spring mechanism to prevent the moving spring mechanism and the pusher base from approaching each other, and the dimension of the spring arm in the movement direction of the moving spring mechanism relative to the pusher base is greater than the limit compression length of the spring arm.

14. The high-voltage DC relay of claim 7, wherein, The high-voltage DC relay further comprises an electromagnetic assembly and a push rod connected to the side of the pusher base away from the moving spring mechanism, and the electromagnetic assembly can drive the pusher base to move towards or away from the static contact through the push rod.

15. The high-voltage DC relay according to any one of claims 1-5, characterized in that The leaf spring is provided in plurality, and the plurality of leaf springs are arranged side by side and spaced from each other or connected to each other in sequence; and / or The protruding structure is formed by bending the base portion.

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