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 static contact and a movable assembly, and the static contact is provided with a static contact point; the movable assembly comprises a movable spring mechanism, a pushing mechanism and an elastic element, the movable spring mechanism comprises a main body and a supporting structure, the pushing mechanism comprises a pushing seat and a limiting structure, the main body is provided with a movable contact opposite to the static contact, and the main body is elastically matched with the pushing seat through the elastic element; the supporting structure is arranged on the side, facing the pushing base, of the main body in a protruding mode, and the limiting structure is arranged on the side, facing the main body, of the pushing base in a protruding mode. The supporting structure is used for abutting against the limiting structure on the path where the main body moves away from the static contact. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to a high-voltage direct current relay. Background Art

[0002] As a new type of electric automatic switch, a high-voltage DC relay can achieve a normally open or normally closed state through electromagnetic holding force. Current high-voltage DC relays typically include an electromagnetic assembly, a moving assembly, and a static contact. The moving contact provided on the moving reed of the moving assembly and the static contact provided on the static contact serve as the contact portion of the high-voltage DC relay. The electromagnetic assembly includes a coil, an upper core, and a lower core. When the coil is energized, it magnetizes the lower core, causing the lower and upper cores to attract each other, thereby driving the moving assembly toward the static contact until the moving contact on the moving assembly contacts the static contact on the static contact, completing the circuit.

[0003] However, current high-voltage DC relays can experience excessive electrodynamic repulsion between the moving and stationary contacts when a short circuit or overload occurs, causing arcing between the moving and stationary contacts and damaging the relay. Industries using high-voltage circuits, such as the new energy sector, are increasingly demanding smaller and more short-circuit-resistant high-voltage DC relays. Utility Model Content

[0004] Based on this, it is necessary to provide a high-voltage DC relay to address the problem that the high-voltage DC relay is easily damaged due to arcing between the moving contact and the static contact when short-circuited or overloaded.

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

[0006] a stationary contactor having a stationary contact point; and

[0007] The dynamic component includes a dynamic spring mechanism, a pushing mechanism and an elastic element. The dynamic spring mechanism includes a main body and a supporting structure. The pushing mechanism includes a pushing seat and a limiting structure. The main body is provided with a dynamic contact opposite to the static contact. The main body is elastically matched with the pushing seat through the elastic element. The supporting structure is protruded on the side of the main body facing the pushing seat. The limiting structure is protruded on the side of the pushing seat facing the main body. When the dynamic contact and the static contact bounce open under the action of a short-circuit current, the supporting structure is used to abut the limiting structure on the path of the main body moving away from the static contact.

[0008] In the above-mentioned high-voltage DC relay, when the circuit connected to the high-voltage DC relay is short-circuited or overloaded, causing the main body's moving contact and the static contact of the static contact to spring apart due to electromotive repulsion, and the dynamic spring mechanism moves in a direction away from the static contact, the main body can first compress the elastic element until the support structure abuts the limiting structure to prevent the main body and the push seat from continuing to move relatively close. Since the electromotive repulsion between the moving contact and the static contact disappears after the moving contact and the static contact spring apart, the elastic element can effectively slow the kinetic energy of the dynamic spring mechanism during the process of the main body moving in a direction away from the static contact until the support structure abuts the limiting structure. Moreover, due to the supporting effect of the support structure and the limiting structure on the main body, the maximum spring-to-close distance between the moving contact and the static contact can be shortened, so that when the support structure abuts the limiting structure, the elastic element will not be compressed to the maximum compression length, and the impact of the main body on the push seat will not be too great, thereby preventing the entire moving component from being separated from the static contact due to excessive impact, thereby damaging the high-voltage DC relay.

[0009] In addition, the abutment between the supporting structure and the limiting structure can prevent the main body from continuing to move away from the static contact, which is beneficial to reducing the maximum bounce distance between the moving contact and the static contact. Combined with the buffering of the elastic element to prevent the moving component from separating from the static contact, the bounce distance between the moving contact and the static contact will not be too far, which is beneficial to avoid the arcing phenomenon between the moving contact and the static contact to generate excessive heat and cause damage or even explosion of the high-voltage DC relay.

[0010] In addition, the buffering of the dynamic spring mechanism by the elastic element can also reduce the holding force requirement of the dynamic component on the electromagnetic component, so that the electromagnetic component can support the entire dynamic component with a smaller holding force, thereby helping to reduce the number of coil winding turns and / or the volume of the iron core of the electromagnetic component, which is conducive to the miniaturization and low-cost design of the high-voltage DC relay.

[0011] Furthermore, the supporting structure protruding from the dynamic spring mechanism and the limiting structure protruding from the pushing mechanism abut against each other along the movement path of the dynamic spring mechanism, without the need for additional parts to support the main body, which is beneficial to reducing the number of parts, simplifying the structure and preparation process of the dynamic assembly, and also conducive to the miniaturization and low-cost realization of the high-voltage DC relay.

[0012] In one embodiment, the elastic element is located between the main body and the pushing seat, and two ends thereof abut against the dynamic spring mechanism and the pushing mechanism respectively.

[0013] In one embodiment, two ends of the elastic element are respectively sleeved on the supporting structure and the limiting structure.

[0014] In one embodiment, a limiting groove is formed on a side of the pushing seat facing the main body and is arranged around the limiting structure. One end of the elastic element is embedded in the limiting groove and sleeved on the limiting structure.

[0015] In one embodiment, the supporting structure and the limiting structure are both located between the main body and the pushing seat, and the supporting structure and the limiting structure are arranged relative to each other.

[0016] In one embodiment, the surfaces of the supporting structure and the limiting structure facing each other are parallel to each other.

[0017] In one embodiment, the main body includes a movable spring and a lower armature connected to the movable spring, the movable contact is provided on a side of the movable spring facing the static contact, and the supporting structure is connected to the lower armature.

[0018] In one embodiment, the lower armature includes a first armature portion and a second armature portion connected to each other, the first armature portion is located on the side of the movable spring piece facing the push seat, the second armature portion is located on the circumferential side of the movable spring piece relative to the movement direction of the push seat, and the support structure is connected to the side of the first armature portion facing away from the movable spring piece.

[0019] In one embodiment, the support structure and the first armature portion are integrally formed.

[0020] In one embodiment, the dynamic component further includes two first support arms, which are respectively located on opposite sides of the elastic element in the axial direction, and the two first support arms are both connected to the pushing seat and slidably cooperate with the main body.

[0021] In one embodiment, the high-voltage DC relay further includes an upper armature opposite to the lower armature, and when the movable contact and the static contact are opposite to each other, the upper armature and the lower armature can be magnetized and attract each other, wherein,

[0022] The upper armature is arranged outside the moving assembly and fixed relative to the static contact; or,

[0023] The moving assembly further includes a second arm connected to the two first arms. The second arm is located on a side of the main body facing away from the pushing mechanism. The upper armature is fixed on the second arm.

[0024] In one embodiment, the pushing seat can drive the main body to move toward the direction close to 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 elastic element. In the process of switching from the first state to the second state, the pushing seat moves relative to the main body toward the direction close to the static contact, and the distance between the limiting structure and the supporting structure in the second state is smaller than that in the first state.

[0025] In one embodiment, in the second state, the difference between the length of the elastic element and the ultimate compression length of the elastic element is greater than the distance between the limiting structure and the supporting structure.

[0026] In one embodiment, the dynamic spring mechanism can bounce relative to the static contact under the action of 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 support structure abuts against the limiting structure to prevent the main body and the pushing seat from approaching each other, and the length of the elastic element is greater than the maximum compression length of the elastic element.

[0027] In one embodiment, the high-voltage DC relay further includes an electromagnetic assembly provided on the side of the push seat facing away from the dynamic spring mechanism, the electromagnetic assembly includes an upper iron core and a lower iron core, the pushing mechanism further includes a pushing rod connected to the side of the push seat facing away from the dynamic spring mechanism, the pushing rod is connected to the lower iron core, and the lower iron core can move toward or away from the upper iron core, so as to drive the push seat to move toward or away from the static contact through the pushing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of a high-voltage DC relay in an initial state in some embodiments.

[0029] Figure 2 for Figure 1 The structural diagram of the dynamic component in the high-voltage DC relay shown in FIG.

[0030] Figure 3 for Figure 2 Exploded view of the moving assembly shown.

[0031] Figure 4 for Figure 2 Schematic diagram of the structure of the dynamic spring mechanism in the dynamic component shown.

[0032] Figure 5Schematic diagram of the structure of a high-voltage DC relay in a first state in some embodiments.

[0033] Figure 6 Schematic diagram of the structure of the high-voltage DC relay in the second state in some embodiments.

[0034] Figure 7 Schematic diagram of the structure of the high-voltage DC relay in the third state in some embodiments.

[0035] Reference numerals:

[0036] 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; 1310. Main body; 1311. Moving spring; 1313. Moving contact; 1314. Lower armature; 1315. First armature portion; 1316. Second armature portion; 132. Elastic element; 133. Pushing mechanism; 1331. Pushing seat; 1332. Pushing rod; 1334. Limiting structure; 1335. Limiting slot; 1351. First arm; 136. Support structure; 14. Static contact; 141. Static contact; 142. Insulating cover; 143. Upper armature. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0043] As HVDC relays become increasingly widely used in various fields, the industry's requirements for their resistance to heat loss, short circuits, and voltages are becoming increasingly stringent. The currents and voltages of the circuits used by HVDC relays are increasing. For example, in new energy vehicles and other equipment, as the range requirements for new energy vehicles increase, the capacity of their battery packs is also increasing. Consequently, the currents and voltages faced by HVDC relays in battery pack circuits are also increasing. Therefore, when the circuit is short-circuited or overloaded, the electric repulsive force generated by the moving contact and the static contact of the high-voltage DC relay is large, which can easily cause the moving contact and the static contact to bounce apart a large distance. For example, the moving contact and the static contact bounce apart until the dynamic spring mechanism squeezes the elastic element to the ultimate compression state, and then transmits the impact force to the driving mechanism and the electromagnetic assembly. At this time, the impact force is too large, which can easily cause the electromagnetic assembly and the moving assembly to fall off relative to the static contact as a whole, causing damage to the high-voltage DC relay, or cause the moving contact and the static contact to bounce apart too far, thereby causing an arc phenomenon between the moving contact and the static contact to generate excessive heat and burn the high-voltage DC relay, or even cause the high-voltage DC relay to explode. However, in traditional high-voltage DC relays, if the holding force of the electromagnetic assembly on the moving assembly is to be improved to avoid insufficient holding force of the electromagnetic assembly causing the moving assembly to separate from the static contact or to reduce the bounce distance between the moving contact and the static contact, it is usually necessary to increase the number of winding turns of the coil, resulting in an increase in the cost and volume of the electromagnetic assembly, which increases the volume and cost of the high-voltage DC relay.

[0044] To solve the above problems, the present application provides a high-voltage DC relay.

[0045] See Figure 1 、 Figure 2 and Figure 3 , Figure 1 Schematic diagram showing the structure of the high-voltage DC relay 10 in the initial state in some embodiments of the present application, Figure 2 and Figure 3 Shown respectively Figure 1The structure diagram and explosion diagram of the dynamic component 13 in the high-voltage DC relay 10 are shown. In some embodiments, the high-voltage DC relay 10 includes a yoke plate 11, an electromagnetic assembly 12, a dynamic component 13, a static contact 14, and an insulating cover 142. The insulating cover 142 is provided on the yoke plate 11, and the static contact 14 is provided on the insulating cover 142. Two static contacts 14 may be provided at intervals, and both static contacts 14 are provided with static contacts 141. The insulating cover 142 includes, but is not limited to, an insulating cover such as a ceramic cover. The dynamic component 13 includes a dynamic spring mechanism 131, an elastic element 132, and a driving mechanism 133. The main body 1310 of the dynamic spring mechanism 131 is provided with two dynamic contacts 1313 corresponding to the two static contacts 141. The driving mechanism 133 is provided with a driving seat 1331. The main body 1310 of the dynamic spring mechanism 131 is elastically connected to the driving seat 1331 via an elastic element 132. In other words, the main body 1310 can move toward the driving seat 1331 to compress the elastic element 132 together with the driving seat 1331, and can also move away from the driving seat 1331 to release the elastic element 132. The electromagnetic assembly 12 is disposed on the side of the yoke iron plate 11 facing away from the dynamic spring mechanism 131. By driving the driving mechanism 133, the electromagnetic assembly 12 can move the entire dynamic assembly 13 toward or away from the static contact 141, thereby causing the dynamic contact 1313 to contact the static contact 141 to achieve circuit conduction, or cause the dynamic contact 1313 to separate from the static contact 141 to achieve circuit disconnection.

[0046] It is understood that the high-voltage DC relay 10 can be used in a circuit as a switching element. The static contact 14 can have a lead terminal electrically connected to the two static contacts 141, and the lead terminal is electrically connected to the circuit. When the movable contact 1313 and the static contact 141 are in contact with each other, the movable contact 1313 conducts the two static contacts 141 to conduct the circuit, and the high-voltage DC relay 10 is opened. When the movable contact 1313 is separated from the static contact 141, the two static contacts 141 are electrically isolated, the circuit is disconnected, and the high-voltage DC relay 10 is closed. In some embodiments, the high-voltage DC relay 10 may further include a housing (not shown) that covers the insulating cover 142 and the static contact 14. The static contact 14 can be extended to the outside of the housing via conductive structures such as electrodes and leads to electrically connect to the circuit. The material of the housing includes but is not limited to an insulating material such as plastic. The housing can isolate the static contact 14, the insulating cover 142, and the movable component 13 from the outside world, providing insulation protection.

[0047] In some embodiments, the pushing mechanism 133 further includes a pushing rod 1332 connected to the side of the pushing seat 1331 facing away from the dynamic spring mechanism 131. The electromagnetic assembly 12 can be arranged on the side of the yoke plate 11 facing away from the dynamic spring mechanism 131. The electromagnetic assembly 12 can include an upper iron core 121, a lower iron core 122, and a coil arranged around the upper iron core 121 and the lower iron core 122. The upper iron core 121 is fixedly arranged 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 can move relative to the yoke plate 11 toward or away from the upper iron core 121. The pushing rod 1332 passes through the yoke plate 11 and the upper iron core 121 and is inserted into the lower iron core 122. The pushing rod 1332 slides with the upper iron core 121 and is fixed relative to the lower iron core 122. When the coil is energized, the upper iron core 121 and the lower iron core 122 can be magnetized, so that the upper iron core 121 and the lower iron core 122 attract each other and drive the lower iron core 122 to move toward the direction close to the upper iron core 121, thereby driving the push rod 1332 to drive the entire component 13 to move toward the direction close to the static contact 141.

[0048] In some embodiments, the dynamic assembly 13 further includes two first arms 1351, located on opposite sides of the elastic element 132 in the axial direction, and both directly or indirectly connected to the push seat 1331. The two first arms 1351 slide with the main body 1310 on opposite sides of the main body 1310 of the dynamic spring mechanism 131 in the direction of movement relative to the push seat 1331, enabling the dynamic spring mechanism 131 to move relative to the push seat 1331 toward or away from the static contact 141. When the main body 1310 and the push seat 1331 approach each other, the main body 1310 and the push seat 1331 can compress the elastic element 132, causing the elastic element 132 to elastically deform. The sliding limit provided by the two first arms 1351 on the main body 1310 guides the movement of the dynamic spring mechanism 131 relative to the push seat 1331, thereby improving the performance and stability of the high-voltage DC relay 10. In some embodiments, the dynamic assembly 13 may further include a second arm (not shown) connected to the two first arms 1351. The second arm may be disposed on a side of the main body 1310 facing away from the push mechanism 133 and located between the main body 1310 and the insulating cover 142. The second arm can limit the movement of the dynamic spring mechanism 131 away from the push seat 1331 on the side of the main body 1310 facing the static contact 141, thereby preventing the dynamic spring mechanism 131 from separating from the elastic element 132 and the push seat 1331, thereby improving the performance and stability of the high-voltage DC relay 10.

[0049] In some embodiments, the main body 1310 of the dynamic spring mechanism 131 includes a dynamic spring piece 1311 and a lower armature 1314 fixedly connected to the dynamic spring piece 1311. The high-voltage DC relay 10 also includes an upper armature 143 opposite the lower armature 1314. The dynamic contact 1313 is located on the side of the dynamic spring piece 1311 facing the static contact 14. The upper armature 143 and the lower armature 1314 together form an anti-short circuit ring structure. The upper armature 143 is located on the side of the lower armature 1314 facing away from the push seat 1331. Figure 1 In the illustrated embodiment, the upper armature 143 is disposed outside the movable assembly 13 and fixed relative to the static 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 static contact 141 and is located between the insulating cover 142 and the movable spring piece 1311. In this case, the movable assembly 13 does not need to be provided with a second arm. The upper armature 143 can limit the main body 1310 of the movable spring mechanism 131 on the side of the movable spring mechanism 131 facing away from the push seat 1331, thereby limiting the movable spring mechanism 131 to an extreme position away from the push seat 1331. In some embodiments, the insulating cover 142 is disposed over the movable assembly 13 and on the yoke plate 11. The static contact 14 and the upper armature 143 are both fixedly disposed on the insulating cover 142. The side of the static contact 14 facing away from the movable spring mechanism 131, that is, the side facing away from the static contact 141, protrudes outside the insulating cover 142. In other embodiments, when the movable assembly 13 is provided with a second arm, the upper armature 143 may be fixed on the second arm and located between the second arm and the movable spring mechanism 131 .

[0050] When the movable contact 1313 and the stationary contact 141 come into contact, the magnetic field generated by the movable spring 1311 and the stationary contact 14 can magnetize the upper armature 143 and the lower armature 1314, causing the upper armature 143 and the lower armature 1314 to attract each other. This can provide a holding force for the movable contact 1313 and the stationary contact 141, thereby reducing the holding force required for the electromagnetic assembly 12 and also reducing the cost and size of the electromagnetic assembly 12. It should be noted that when the upper armature 143 is disposed on the insulating cover 142, the movable assembly 13 can also be provided with a second arm, and the upper armature 143 and the movable spring 1311 can be separated by the second arm. The second arm then defines the limit position of the movable spring mechanism 131's movement away from the push seat 1331.

[0051] Further, combined with Figure 1 、 Figure 3 and Figure 4As shown, in some embodiments, the dynamic spring mechanism 131 further includes a support structure 136 connected to the main body 1310, and the pushing mechanism 133 further includes a limiting structure 1334 connected to the pushing seat 1331. The support structure 136 is protruding from the side of the main body 1310 facing the pushing seat 1331, and the limiting structure 1334 is protruding from the side of the pushing seat 1331 facing the main body 1310. When the movable contact 1313 and the static contact 141 spring apart under the action of a short-circuit current, causing the dynamic spring mechanism 131 to move away from the static contact 141, for example, toward the pushing seat 1331, the support structure 136 is configured to abut the limiting structure 1334 along the path of the main body 1310 moving away from the static contact 141. When the support structure 136 abuts the limiting structure 1334, the support structure 136 and the limiting structure 1334 can provide support for the main body 1310, preventing the main body 1310 and the pushing seat 1331 from moving further toward each other. In some embodiments, the movement direction of the dynamic spring mechanism 131 away from the static contact 14 is the same as the movement direction toward the push seat 1331 .

[0052] Please see again Figure 1 In this application, the state in which the moving contact 1313 and the static contact 141 are spaced apart and the electromagnetic assembly 12 does not apply a force to the push rod 1332, that is, the state in which the high-voltage DC relay 10 disconnects the circuit, is referred to as the initial state of the high-voltage DC relay 10. In the initial state, the support structure 136 and the limiting structure 1334 are spaced apart. When the moving contact 1313 and the static contact 141 need to be brought into contact to conduct the circuit, the coil in the electromagnetic assembly 12 is energized, and the lower iron core 122 moves toward the upper iron core 121, which can drive the push rod 1332 to drive the push seat 1331, and then drive the dynamic spring mechanism 131 to move toward the static contact 141, so that the moving assembly 13 has a first state and a second state. See Figure 5 As shown, when the movable assembly 13 moves to the first state, the movable contact 1313 contacts the stationary contact 141, and the high-voltage DC relay 10 conducts the circuit. In the first state, the length of the elastic element 132 is the same as in the initial state. In other words, when the pushing mechanism 133 drives the movable spring mechanism 131 toward the stationary contact 141 to switch from the initial state to the first state, the movable spring mechanism 131, the first arm 1351, the elastic element 132, and the pushing mechanism 133 move synchronously, and the distance between the main body 1310 and the pushing seat 1331 does not change.

[0053] See Figure 6As shown, after the electromagnetic assembly 12 drives the dynamic spring mechanism 131 to move to the first state via the pushing mechanism 133, the electromagnetic assembly 12 continues to drive the pushing mechanism 133 to move toward the second state, toward the static contact 141. During the transition from the first state to the second state, due to the contact between the dynamic contact 1313 and the static contact 141, the dynamic spring mechanism 131 and the static contact 14 remain relatively fixed, while the pushing mechanism 133 continues to move toward the static contact 141, causing the distance between the pushing seat 1331 and the main body 1310 to decrease. In other words, during the transition from the first state to the second state, the main body 1310 and the pushing seat 1331 are relatively close. This relative proximity of the main body 1310 and the pushing seat 1331 compresses the elastic element 132, causing the length of the elastic element 132 to decrease and causing elastic deformation of the elastic element 132. It is understood that in both the first and second states, the movable contact 1313 is in contact with the static contact 141, and in the second state, the elastic element 132 can exert an elastic force on the main body 1310 to press the main body 1310 against the static contact 14, thereby improving the stability and reliability of the contact between the movable contact 1313 and the static contact 141. At the same time, the elastic element 132 can cooperate with the electromagnetic assembly 12 to offset at least part of the electromotive force between the movable contact 1313 and the static contact 141, thereby reducing the retention force required by the high-voltage DC relay 10 for the electromagnetic assembly 12 and thus reducing the cost and size of the electromagnetic assembly 12.

[0054] It can be understood that in the process of switching from the initial state to the first state, and in the process of switching 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 is spaced apart from the upper iron core 121. In the second state, the lower iron core 122 can just contact the upper iron core 121, which is conducive to enhancing 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.

[0055] In some embodiments, the length of the support structure 136 protruding from the main body 1310 and the length of the limiting structure 1334 protruding from the push seat 1331 are designed so that, in the second state, the support structure 136 remains spaced apart from the limiting structure 1334, and the distance between the support structure 136 and the limiting structure 1334 is smaller in the second state than in the first state. Furthermore, in the second state, the difference between the length of the elastic element 132 and the ultimate compression length of the elastic element 132 is greater than the distance between the support structure 136 and the limiting structure 1334. In some embodiments, the length of the elastic element 132 can be equal to the vertical distance between the main body 1310 and the push seat 1331.

[0056] Combine Figure 7As shown, it can be understood that when the circuit is short-circuited or overloaded, taking the current exceeding 8 kA as an example in this application, the electrokinetic repulsive force between the movable contact 1313 and the static contact 141 is greater than the elastic force exerted by the elastic element 132 on the dynamic spring mechanism 131, causing the movable contact 1313 and the static contact 141 to bounce apart, causing the dynamic spring mechanism 131 to move toward the push seat 1331 and further compress the elastic element 132 until the support structure 136 abuts the limiting structure 1334. At this point, the support structure 136 provides support for the main body 1310, preventing the main body 1310 from moving relative to the push seat 1331 toward the push seat 1331. In this application, the state in which the support structure 136 abuts against the limiting structure 1334 to provide support for the main body 1310 is referred to as the third state of the high-voltage DC relay 10. In the third state, the dynamic spring mechanism 131, the first arm 1351 and the pushing mechanism 133 are relatively fixed, and the electromagnetic component 12 bears the impact force of the dynamic spring mechanism 131.

[0057] It can be understood that in the present application, the support structure 136 contacts the limiting structure 1334 only in the third state to achieve a supporting effect on the main body 1310. In other states, the support structure 136 and the limiting structure 1334 will not interfere with the relative movement of the main body 1310 and the push seat 1331, which is beneficial to avoid the setting of the support structure 136 and the limiting structure 1334 causing other types of interference such as sliding fit and limiting fit on the movement of the main body 1310, thereby increasing the risk of the main body 1310 getting stuck, uneven force or wear and scraping, etc., and while achieving the supporting effect, it is also beneficial to maintain the structural reliability of the dynamic component 13.

[0058] In the aforementioned high-voltage DC relay 10, when the circuit connected to the high-voltage DC relay 10 is short-circuited or overloaded, causing the movable contact 1313 of the main body 1310 and the static contact 141 of the static contact 14 to spring apart due to electrodynamic repulsion, and the dynamic spring mechanism 131 moves away from the static contact 14, the main body 1310 can first compress the elastic element 132 until the support structure 136 abuts the limiting structure 1334, thereby preventing the main body 1310 and the push seat 1331 from further approaching each other. Because the electrodynamic repulsive force between the movable contact 1313 and the static contact 141 disappears after the movable contact 1313 and the static contact 141 spring apart, the elastic element 132 can effectively slow the kinetic energy of the dynamic spring mechanism 131 as the main body 1310 moves away from the static contact 141 until the support structure 136 abuts the limiting structure 1334. And due to the supporting effect of the support structure 136 and the limiting structure 1334 on the main body 1310, the maximum bounce distance between the moving contact 1313 and the static contact 141 can be shortened, so that when the support structure 136 abuts against the limiting structure 1334, the elastic element 132 will not be compressed to the maximum compression length, and the impact of the main body 1310 on the pushing seat 1331 will not be too large, thereby avoiding the dynamic component 13 being separated from the static contact 14 as a whole due to excessive impact, thereby damaging the high-voltage DC relay 10.

[0059] In addition, the abutment between the support structure 136 and the limiting structure 1334 can prevent the main body 1310 from continuing to move away from the static contact 141, which is beneficial to reducing the maximum bounce distance between the moving contact 1313 and the static contact 141. Combined with the buffering of the elastic element 132 to avoid the moving component 13 from separating from the static contact 14, the bounce distance between the moving contact 1313 and the static contact 141 will not be too far, which is beneficial to avoid the arcing phenomenon between the moving contact 1313 and the static contact 141 to generate excessive heat and cause damage or even explosion of the high-voltage DC relay 10.

[0060] In addition, the buffering of the dynamic spring mechanism 131 by the elastic element 132 can also reduce the holding force requirement of the dynamic component 13 on the electromagnetic component 12, so that the electromagnetic component 12 can support the entire dynamic component 13 with a smaller holding force, thereby helping to reduce the number of coil winding turns and / or the volume of the iron core of the electromagnetic component 12, which is beneficial to the miniaturization and low-cost design of the high-voltage DC relay 10.

[0061] Furthermore, the supporting structure 136 protruding from the dynamic spring mechanism 131 and the limiting structure 1334 protruding from the pushing mechanism 133 abut against each other along the movement path of the dynamic spring mechanism 131, without the need for additional parts to support the main body 1310, which is beneficial to reducing the number of parts, simplifying the structure and preparation process of the dynamic component 13, and also conducive to the miniaturization and low-cost realization of the high-voltage DC relay 10.

[0062] Thus, in the process of switching from the second state to the third state, the above-mentioned high-voltage DC relay 10 first buffers the impact of the dynamic spring mechanism 131 through the elastic element 132, and then the electromagnetic assembly 12 bears the impact of the dynamic spring mechanism 131, which is conducive to reducing the demand for the holding force of the electromagnetic assembly 12, and is conducive to reducing the cost and volume of the electromagnetic assembly 12. At the same time, it can also reduce the spring distance between the moving contact 1313 and the static contact 141, thereby reducing the heat generated by the arc phenomenon. The above-mentioned high-voltage DC relay 10 can take into account the effects of small size, low cost and high short-circuit current and voltage resistance. Based on this, the high-voltage DC relay 10 provided in the present application can be used in circuits with higher currents, such as circuits with an operating current of less than 8kA. The high-voltage DC relay 10 includes but is not limited to being used in battery pack circuits for new energy vehicles. The high-voltage DC relay 10 can also be used in circuits of any other applicable equipment as a switching element, which will not be described in detail in this application.

[0063] In some embodiments, the elastic element 132 is disposed between the push seat 1331 and the main body 1310, with its two ends respectively abutting the main body 1310 and the push seat 1331. The two ends of the elastic element 132 can be respectively connected to the dynamic spring mechanism 131 and the push seat 1331 push mechanism 133. This arrangement allows for a rational planning of the spatial layout between the dynamic spring mechanism 131, the elastic element 132, and the push mechanism 133, making the structure of the dynamic assembly 13 more compact and facilitating improved spatial efficiency of the dynamic assembly 13. It also facilitates positioning the elastic element 132 relatively away from the contact position between the dynamic contact 1313 and the static contact 141, reducing the effects of high temperature and ablation spatter on the elastic element 132 and reducing the difficulty of assembling the elastic element 132 with other components.

[0064] In some embodiments, the support structure 136 is connected to the lower armature 1314. For example, the lower armature 1314 includes a first armature portion 1315 and a second armature portion 1316 that are interconnected. The first armature portion 1315 is located on the side of the movable spring 1311 facing the push seat 1331, and the second armature portion 1316 is located on the side of the movable spring 1311 that is circumferentially relative to the push seat 1331 in the direction of motion. The support structure 136 is connected to the side of the first armature portion 1315 that faces away from the movable spring 1311. The second armature portion 1316 may include two portions located on opposite sides of the movable spring 1311, each of which is connected to the ends of the first armature portion 1315. Furthermore, in some embodiments, the support structure 136, the first armature portion 1315, and the second armature portion 1316 may be integrally formed, eliminating the need for additional parts to form the support structure 136. This simplifies the manufacturing process of the movable assembly 13 and reduces manufacturing costs.

[0065] In some embodiments, the support structure 136 and the limiting structure 1334 are both located between the main body 1310 and the push seat 1331, with the support structure 136 and the limiting structure 1334 facing each other. The opposing surfaces of the support structure 136 and the limiting structure 1334 may be parallel to each other, thereby improving the structural stability of the support structure 136 and the limiting structure 1334 when they abut against each other and preventing relative deflection between the dynamic spring mechanism 131 and the push mechanism 133. It will be appreciated that the support structure 136 and the limiting structure 1334 are located between the main body 1310 and the push seat 1331, and are both relatively far from the contact point between the moving contact 1313 and the static contact 141. This helps to reduce the effects of high temperature and ablation spatter on the support structure 136 and the limiting structure 1334. For example, this prevents the distance between the support structure 136 and the limiting structure 1334 from being reduced due to spatter, thereby preventing the switching from the second state to the third state from being affected.

[0066] In some embodiments, the ends of the elastic element 132 are respectively sleeved onto the support structure 136 and the limiting structure 1334. For example, the end of the elastic element 132 away from the push seat 1331 is sleeved onto the support structure 136. The push seat 1331 has a limiting groove 1335 formed on the side facing the main body 1310, surrounding the limiting structure 1334. The end of the elastic element 132 away from the main body 1310 is embedded in the limiting groove 1335 and sleeved onto the limiting structure 1334. This arrangement can rationally plan the connection relationship between the dynamic spring mechanism 131, the elastic element 132, and the push mechanism 133, thereby improving the connection reliability between the elastic element 132, the dynamic spring mechanism 131, and the push mechanism 133, and simplifying the assembly of the elastic element 132, the dynamic spring mechanism 131, and the push mechanism 133, thereby reducing assembly costs.

[0067] In the present application, the description of the first support arm 1351 as slidingly engaged with the main body 1310 can be that the opposite sides of the lower armature 1314, that is, the opposite sides of the second armature portion 1316, slide in engagement with the opposing surfaces of the two first support arms 1351, or the opposite sides of the movable spring 1311 slide in engagement with the two first support arms 1351, or that a portion of the movable spring 1311 or the second armature portion 1316 is inserted and slidably disposed on the first support arm 1351. As long as the first support arm 1351 can provide guidance and limit the movement of the main body 1310 relative to the push seat 1331, it is sufficient. In some embodiments, the first support arm 1351 can be directly connected to the push seat 1331, for example, by being integrally formed with the push seat 1331 through insert injection molding. The movable assembly 13 can also include a fixing plate (not shown) connected to the first support arm 1351 and the push seat 1331, indirectly connecting the first support arm 1351 to the push seat 1331 via the fixing plate.

[0068] In the embodiments shown in the accompanying drawings, the movable spring 1311 is a single-piece spring structure. In other embodiments, the movable spring 1311 may include two spaced-apart sub-springs arranged in parallel, and the lower armature 1314 may be simultaneously connected to the two sub-springs. The lower armature 1314 may also include two spaced-apart sub-armatures, each of which is connected to the two sub-springs in a one-to-one correspondence. Each movable contact 1313 of the movable spring 1311 may be formed by the corresponding positions of the two sub-springs. This arrangement allows the two sub-springs to provide more stable electrical contact, reducing contact failure caused by wear or damage to a single spring. It also shares the mechanical load of the movable contact 1313, reducing the stress on a single spring, improving the durability of the high-voltage DC relay 10, and providing more uniform current distribution, reducing arcing and contact resistance, and improving electrical contact performance. Furthermore, if one sub-spring fails, the other sub-spring can still achieve on-off control of the circuit with the static contact 141, improving the performance and reliability of the high-voltage DC relay 10.

[0069] In the present application, the elastic element 132 includes but is not limited to any applicable elastic component such as a coil spring and a leaf spring. In the drawings of the present application, a coil spring is taken as an example. The connection setting and orientation setting between the elastic element 132 and the dynamic spring mechanism 131 and the pushing mechanism 133 are not limited, as long as the elastic coordination between the dynamic spring mechanism 131 and the pushing mechanism 133 can be achieved to buffer the dynamic spring mechanism 131 during the switching process from the second state to the third state.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0071] The above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A high voltage DC relay, characterized in that: include: Static contact, provided with a static contact point; as well as, The dynamic component includes a dynamic spring mechanism, a pushing mechanism and an elastic element. The dynamic spring mechanism includes a main body and a supporting structure. The pushing mechanism includes a pushing seat and a limiting structure. The main body is provided with a dynamic contact opposite to the static contact. The main body is elastically matched with the pushing seat through the elastic element. The supporting structure is protruded on the side of the main body facing the pushing seat. The limiting structure is protruded on the side of the pushing seat facing the main body. When the dynamic contact and the static contact bounce open under the action of a short-circuit current, the supporting structure is used to abut the limiting structure on the path of the main body moving away from the static contact.

2. The high voltage DC relay according to claim 1, characterized in that: The elastic element is located between the main body and the pushing seat, and two ends of the elastic element respectively abut against the dynamic spring mechanism and the pushing mechanism.

3. The high voltage DC relay according to claim 2, characterized in that: Two ends of the elastic element are respectively sleeved on the supporting structure and the limiting structure.

4. The high-voltage DC relay according to claim 1, characterized in that: A limiting groove arranged around the limiting structure is formed on one side of the pushing seat facing the main body, and one end of the elastic element is embedded in the limiting groove and sleeved on the limiting structure.

5. The high voltage DC relay according to claim 1, characterized in that: The supporting structure and the limiting structure are both located between the main body and the pushing seat, and the supporting structure and the limiting structure are arranged opposite to each other.

6. The high-voltage DC relay according to claim 5, characterized in that: The surfaces of the supporting structure and the limiting structure facing each other are parallel to each other.

7. The high-voltage DC relay according to claim 1, characterized in that: The main body includes a movable spring and a lower armature connected to the movable spring. The movable contact is arranged on a side of the movable spring facing the static contact. The supporting structure is connected to the lower armature.

8. The high-voltage DC relay according to claim 7, characterized in that: The lower armature includes a first armature part and a second armature part connected to each other, the first armature part is located on the side of the movable spring piece facing the push seat, the second armature part is located on the circumferential side of the movable spring piece relative to the movement direction of the push seat, and the support structure is connected to the side of the first armature part facing away from the movable spring piece.

9. The high-voltage DC relay according to claim 8, characterized in that: The supporting structure and the first armature part are integrally formed.

10. The high-voltage DC relay according to claim 7, characterized in that: The dynamic component further includes two first support arms, which are respectively located on opposite sides of the elastic element in the axial direction. The two first support arms are both connected to the pushing seat and slidably cooperate with the main body.

11. The high-voltage DC relay according to claim 10, characterized in that: The high-voltage DC relay further includes an upper armature opposite to the lower armature, and when the movable contact and the static contact are opposite to each other, the upper armature and the lower armature can be magnetized and attract each other, wherein, The upper armature is arranged outside the moving assembly and fixed relative to the static contact; or, The moving assembly further includes a second arm connected to the two first arms. The second arm is located on a side of the main body facing away from the pushing mechanism. The upper armature is fixed on the second arm.

12. The high-voltage DC relay according to any one of claims 1 to 11, characterized in that: The pushing seat can drive the main body to move toward the direction close to 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 elastic element. In the process of switching from the first state to the second state, the pushing seat moves relative to the main body toward the direction close to the static contact, and the distance between the limiting structure and the supporting structure in the second state is smaller than that in the first state.

13. The high-voltage DC relay according to claim 12, characterized in that: In the second state, the difference between the length of the elastic element and the ultimate compression length of the elastic element is greater than the distance between the limiting structure and the supporting structure.

14. The high-voltage DC relay according to claim 12, characterized in that: The dynamic spring mechanism can bounce relative to the static contact under the action of 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 support structure abuts against the limiting structure to prevent the main body and the pushing seat from approaching each other, and the length of the elastic element is greater than the maximum compression length of the elastic element.

15. The high-voltage DC relay according to any one of claims 1 to 11, characterized in that: The high-voltage DC relay also includes an electromagnetic assembly arranged on the side of the push seat facing away from the dynamic spring mechanism, the electromagnetic assembly includes an upper iron core and a lower iron core, and the pushing mechanism also includes a pushing rod connected to the side of the push seat facing away from the dynamic spring mechanism, the pushing rod is connected to the lower iron core, and the lower iron core can move toward or away from the upper iron core, so as to drive the push seat to move toward or away from the static contact through the pushing rod.

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