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 which is provided with a static contact point; the movable assembly comprises a movable spring mechanism, a pushing mechanism, an elastic element, a support and a supporting element, the movable spring mechanism is elastically matched with the pushing mechanism through the elastic element, and the two first supporting arms of the support are located on the two opposite sides of the movable spring mechanism respectively; the first supporting arms are connected to the pushing mechanism and are in sliding fit with the movable spring mechanism, the two ends of the supporting element are connected to the two first supporting arms respectively, the supporting element and the movable spring mechanism are partially opposite and arranged in a spaced mode, and when the movable contact and the static contact are bounced off under the action of short-circuit current, the movable contact and the static contact are separated from each other. The supporting element is used for abutting against the movable spring mechanism on the path where the movable spring mechanism moves towards the pushing mechanism. 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 assembly includes a dynamic spring mechanism, a pushing mechanism, an elastic element, a bracket and a supporting element. The dynamic spring mechanism is provided with a dynamic contact opposite to the static contact. The dynamic spring mechanism is elastically matched with the pushing mechanism through the elastic element. The bracket includes two first arms, and the two first arms are respectively located on opposite sides of the dynamic spring mechanism in the direction of movement relative to the pushing mechanism. The first arms are connected to the pushing mechanism and slidably matched with the dynamic spring mechanism. The two ends of the supporting element are respectively connected to the two first arms. The supporting element is partially opposite to the dynamic spring mechanism and is arranged at a distance. When the dynamic contact and the static contact bounce open under the action of a short-circuit current, the supporting element is used to abut the dynamic spring mechanism on the path where the dynamic spring mechanism moves toward the pushing mechanism.

[0008] In the aforementioned high-voltage DC relay, when a short circuit or overload occurs in the circuit connected to the high-voltage DC relay, causing the movable contact of the movable spring mechanism and the static contact of the static contact to spring apart due to electrodynamic repulsion, the movable spring mechanism can first compress the elastic element until the support element abuts the movable spring mechanism, thereby preventing the movable spring mechanism and the driving mechanism from moving closer together. Since the electrodynamic repulsion between the movable and static contacts disappears after the movable and static contacts spring apart, the elastic element can effectively buffer the kinetic energy of the movable spring mechanism as the movable spring mechanism moves away from the static contact until the support element abuts the movable spring mechanism. Furthermore, the support provided by the support element to the movable spring mechanism shortens the maximum spring-to-close distance between the movable spring mechanism and the static contact. This prevents the elastic element from being compressed to its maximum compression length when the support element abuts the movable spring mechanism, and prevents excessive impact from the movable spring mechanism on the driving mechanism, thereby preventing the entire movable assembly from separating from the static contact due to excessive impact and causing damage to the high-voltage DC relay.

[0009] Furthermore, the abutment of the support element against the movable spring mechanism can prevent the movable spring mechanism from moving further away from the static contact, thereby reducing the relative distance between the movable and static contacts. Combined with the design of the elastic element's buffering to prevent the movable assembly from separating from the static contact, the distance between the movable and static contacts is kept within a certain range, thereby preventing arcing between the movable and static contacts from generating excessive heat, which could damage or even explode the high-voltage DC relay. Furthermore, the elastic element's buffering of the movable spring mechanism can also reduce the required holding force of the movable assembly on the electromagnetic assembly, allowing the electromagnetic assembly to support the entire movable assembly with less holding force, thereby reducing the number of coil turns and / or the volume of the iron core of the electromagnetic assembly, thereby facilitating the miniaturization of the high-voltage DC relay. Furthermore, the provision of support elements on the two first arms to abut the movable spring mechanism along its motion path simplifies assembly and reduces installation costs, thus simplifying the structure and manufacturing process of the movable assembly and facilitating the miniaturization and cost-effectiveness of the high-voltage DC relay.

[0010] In one embodiment, the elastic element is located between the dynamic spring mechanism and the pushing mechanism, and two ends of the elastic element are respectively in contact with the dynamic spring mechanism and the pushing mechanism.

[0011] In one embodiment, the supporting element is located between the dynamic spring mechanism and the pushing mechanism.

[0012] In one embodiment, the elastic element includes a leaf spring, the elastic element has a base and two spring arms, the two spring arms are respectively connected to the two ends of the base, the base is fixed on the pushing mechanism, and the supporting element is located between the two spring arms.

[0013] In one embodiment, the support element is a rod-shaped structure, and two ends of the support element are respectively passed through the two first arms.

[0014] In one embodiment, the dynamic spring mechanism includes a dynamic spring piece and a lower armature, the dynamic contact is arranged on the side of the dynamic spring piece facing the static contact, the lower armature is fixedly connected to the dynamic spring piece, the two ends of the dynamic spring piece protrude from the lower armature, the two spring arms respectively abut against the two ends of the dynamic spring piece protruding from the lower armature, and the support element is opposite to the lower armature.

[0015] In one embodiment, the supporting element is a sheet-like structure, which includes a sheet-like main body and two protrusions, the two protrusions are respectively connected to the two opposite edges of the sheet-like main body, the sheet-like main body is located between the two first arms, and the two protrusions are respectively embedded in the two first arms.

[0016] In one embodiment, the sheet-like body is provided with a through hole, the elastic element comprises a coil spring, and the elastic element passes through the sheet-like body through the through hole.

[0017] In one embodiment, a receiving groove is recessed on a side of the pushing seat of the pushing mechanism facing the dynamic spring mechanism. The receiving groove is arranged corresponding to the sheet-like body, and at least a portion of the sheet-like body is accommodated in the receiving groove.

[0018] In one embodiment, the dynamic spring mechanism includes a dynamic spring plate and a lower armature, the dynamic contact is arranged on the side of the dynamic spring plate facing the static contact, the lower armature is fixedly connected to the dynamic spring plate, and the supporting element is opposite to either the lower armature or the dynamic spring plate.

[0019] 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;

[0020] Wherein, the upper armature is arranged outside the moving assembly and fixed relative to the static contact; or,

[0021] The bracket further includes a second arm connected to the two first arms. The second arm is located on a side of the dynamic spring mechanism facing away from the pushing mechanism. The upper armature is fixed on the second arm.

[0022] In one embodiment, the pushing mechanism can drive the dynamic spring mechanism to move toward the direction approaching the static contact, so that the high-voltage DC relay has a first state and a second state. In the first state, the dynamic contact is just in contact with the static contact. In the second state, the dynamic contact is pressed against the static contact by the elastic element. During the switching from the first state to the second state, the pushing mechanism moves relative to the dynamic spring mechanism toward the direction approaching the static contact, and the distance between the support element and the dynamic spring mechanism in the second state is smaller than that in the first state.

[0023] In one embodiment, in the second state, the difference between the dimension of the elastic element in the direction of movement of the dynamic spring mechanism relative to the pushing mechanism and the ultimate compression length of the elastic element is greater than the distance between the supporting element and the dynamic spring mechanism.

[0024] 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 supporting element abuts against the dynamic spring mechanism to prevent the dynamic spring mechanism and the pushing mechanism from approaching each other, and the length of the elastic element is greater than the maximum compression length of the elastic element.

[0025] In one embodiment, the high-voltage DC relay also includes an electromagnetic assembly, the pushing mechanism includes a pushing seat and a pushing rod connected to the side of the pushing seat facing away from the dynamic spring mechanism, the dynamic spring mechanism is elastically matched with the pushing seat through the elastic element, the pushing rod is inserted into the electromagnetic assembly, and the electromagnetic assembly can drive the pushing seat to move toward or away from the static contact through the pushing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of a high-voltage DC relay in some embodiments.

[0027] Figure 2 for Figure 1 The cross-sectional schematic diagram of the high-voltage DC relay along the AA direction is shown.

[0028] Figure 3 Schematic diagram of the structure of the dynamic component in some embodiments.

[0029] Figure 4 Schematic diagram of the structure of the dynamic components in other embodiments.

[0030] Figure 5 for Figure 4 An exploded schematic diagram of the moving assembly.

[0031] Figure 6 Schematic diagram of the structure of a high-voltage DC relay in a first state in some embodiments.

[0032] Figure 7 Schematic diagram of the structure of the high-voltage DC relay in the second state in some embodiments.

[0033] Figure 8 Schematic diagram of the structure of the high-voltage DC relay in the third state in some embodiments.

[0034] Figure 9 for Figure 3 A schematic structural diagram of the moving component from another angle is shown.

[0035] Figure 10 for Figure 9 Exploded view of the moving assembly shown.

[0036] Reference numerals:

[0037] 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 leaf; 1312. Sub-spring leaf; 1313. Moving contact; 1314. Lower armature; 132. Elastic element; 1321. Base; 1322. Spring arm; 1323. Sheet-shaped body; 1324. Protrusion; 133. Pushing mechanism; 1331. Pushing seat; 1332. Pushing rod; 1333. Accommodating groove; 135. Bracket; 1351. First arm; 1352. Second arm; 136. Support element; 14. Static contact; 141. Static contact; 142. Insulating cover; 143. Upper armature. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 increased to prevent the electromagnetic assembly from being separated from the static contact due to insufficient holding force 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.

[0045] To solve the above problems, the present application provides a high-voltage DC relay.

[0046] See Figure 1-Figure 4 , Figure 1 Schematic diagram of the structure of the high voltage DC relay 10 in some embodiments of the present application is shown. Figure 2 for Figure 1 The cross-sectional view of the high-voltage DC relay 10 along the AA direction is shown. Figure 3 and Figure 4They are schematic diagrams of the structure of the moving component 13 in the high-voltage DC relay 10 at different angles in some embodiments. In some embodiments, the high-voltage DC relay 10 includes a yoke plate 11, an electromagnetic component 12, a moving 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 can 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 shell such as a ceramic cover. Figure 2 and Figure 5 As shown, the movable assembly 13 includes a movable spring mechanism 131, an elastic element 132, and a driving mechanism 133. The movable spring mechanism 131 is provided with two movable contacts 1313, one opposite each of the two static contacts 141. The movable spring mechanism 131 elastically cooperates with the driving mechanism 133 via the elastic element 132. That is, the movable spring mechanism 131 can move toward the driving mechanism 133 to compress the elastic element 132 together with the driving mechanism 133, and can also move away from the driving mechanism 133 to release the elastic element 132. The electromagnetic assembly 12 is disposed on the side of the yoke plate 11 facing away from the movable spring mechanism 131. By driving the driving mechanism 133, the entire movable assembly 13 can move toward or away from the static contacts 141, thereby causing the movable contacts 1313 to contact the static contacts 141 to connect the circuit, or cause the movable contacts 1313 to separate from the static contacts 141 to disconnect the circuit.

[0047] It will be appreciated 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 come into contact with each other, the movable contact 1313 conducts electricity through the two static contacts 141, thereby completing the circuit and turning the high-voltage DC relay 10 on. When the movable contact 1313 separates from the static contact 141, the two static contacts 141 are electrically isolated, disconnecting the circuit and turning the high-voltage DC relay 10 off. 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 contacts 14. The static contacts 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 housing can be made of, but not limited to, an insulating material such as plastic. The housing can isolate the static contacts 14, the insulating cover 142, and the movable assembly 13 from the outside world, providing insulation protection.

[0048] 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 dynamic spring mechanism 131. The electromagnetic assembly 12 may 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 mounted on the yoke iron plate 11, and the coil is fixed relative to the yoke iron plate 11. The lower iron core 122 is opposite to the upper iron core 121 and is located on the side of the upper iron core 121 facing away from the yoke iron plate 11. The lower iron core 122 can move relative to the yoke iron plate 11 toward or away 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 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.

[0049] refer to Figure 2 、 Figure 4 and Figure 5 As shown, in some embodiments, the dynamic assembly 13 further includes a bracket 135. The bracket 135 may include two first arms 1351. The two first arms 1351 are located on opposite sides of the dynamic spring mechanism 131 in the direction of movement relative to the push mechanism 133, and are directly or indirectly connected to the push seat 1331. The two first arms 1351 slide with the dynamic spring mechanism 131 on opposite sides of the dynamic spring mechanism 131 to limit the movement of the dynamic spring mechanism 131 relative to the push seat 1331 in directions toward or away from the static contact 141. When the dynamic spring mechanism 131 and the push seat 1331 are relatively close, the dynamic spring mechanism 131 and the push seat 1331 can compress the elastic element 132, causing the elastic element 132 to elastically deform. The sliding limit of the dynamic spring mechanism 131 by the two first arms 1351 can guide 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.

[0050] In some embodiments, the bracket 135 may further include a second arm 1352 connected to the two first arms 1351. The second arm 1352 may be disposed on a side of the movable spring mechanism 131 facing away from the push mechanism 133 and located between the movable spring mechanism 131 and the insulating cover 142. The second arm 1352 can limit the movement of the movable spring mechanism 131 away from the push seat 1331 on the side of the movable spring mechanism 131 facing the static contact 141, thereby preventing the movable 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.

[0051] In some embodiments, 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 to 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 2 In the illustrated embodiment, the upper armature 143 is disposed outside the movable assembly 13 and is fixed relative to the static contact 14. For example, the upper armature 143 may be disposed on the insulating cover 142, corresponding to the static contact 141, and located between the insulating cover 142 and the second arm 1352. Alternatively, the bracket 135 may be provided without the second arm 1352, in which case the upper armature 143 is located between the insulating cover 142 and the movable spring piece 1311. When the bracket 135 is provided without the second arm 1352, the upper armature 143 can limit the movable spring mechanism 131 on the side facing away from the push seat 1331, thereby limiting the movable spring mechanism 131 to its extreme position away from the push seat 1331. In some embodiments, the insulating cover 142 is disposed over the movable assembly 13 and is disposed on the yoke plate 11. The static contact 14 and the upper armature 143 are both fixedly mounted on the insulating cover 142. The static contact 14 faces away from the movable spring mechanism 131, that is, the side facing away from the static contact 141 protrudes out of the insulating cover 142. In other embodiments, when the bracket 135 is provided with a second arm 1352, the upper armature 143 may also be fixed to the second arm 1352 and positioned between the second arm 1352 and the movable spring mechanism 131.

[0052] When the moving contact 1313 and the static contact 141 are in contact, the magnetic field generated by the moving spring 1311 and the static 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 static contact 141, which is beneficial to reducing the holding force required for the electromagnetic assembly 12, and is also beneficial to reducing the cost and volume of the electromagnetic assembly 12.

[0053] Further, combined with Figure 2 、 Figure 4 and Figure 5As shown, in some embodiments, the movable assembly 13 further includes a support element 136. The ends of the support element 136 are respectively connected to the two first arms 1351 to be fixed relative to the bracket 135. A portion of the support element 136 is disposed opposite and spaced apart from the dynamic spring mechanism 131. When the dynamic 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 14, the support element 136 can abut the dynamic spring mechanism 131 as it moves toward the push seat 1331. It will be appreciated that when the support element 136 abuts the dynamic spring mechanism 131, it can prevent the dynamic spring mechanism 131 and the push seat 1331 from moving closer to each other. In some embodiments, the direction of movement of the dynamic spring mechanism 131 away from the static contact 14 is the same as the direction of movement toward the push seat 1331. It should be noted that the supporting element 136 can be opposite to one of the movable spring piece 1311 and the lower armature 1314 of the movable spring mechanism 131, so as to abut against one of the movable spring piece 1311 and the lower armature 1314 on the path of the movable spring mechanism 131 moving toward the push seat 1331, or it can be opposite to both the movable spring piece 1311 and the lower armature 1314 at the same time, so as to abut against both the movable spring piece 1311 and the lower armature 1314 at the same time, as long as it can achieve the supporting effect on the movable spring mechanism 131.

[0054] It should be noted that in this application, the movable 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 called the initial state. In the initial state, the support element 136 is spaced apart from the dynamic spring mechanism 131. When the movable 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 movable assembly 13 has a first state and a second state. Please refer to Figure 6 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 bracket 135, the elastic element 132, and the pushing mechanism 133 move synchronously.

[0055] See Figure 7As shown, after the electromagnetic assembly 12 drives the dynamic spring mechanism 131 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. The continued movement of the pushing mechanism 133 toward the static contact 141 causes the distance between the pushing seat 1331 and the dynamic spring mechanism 131 to decrease. In other words, during the transition from the first state to the second state, the dynamic spring mechanism 131 and the pushing seat 1331 are relatively close. This relative proximity of the dynamic spring mechanism 131 and the pushing seat 1331 compresses the elastic element 132, causing the length of the elastic element 132 to decrease and elastically deform the elastic element 132. It is understood that in both the first and second states, the movable contact 1313 is in contact with the stationary contact 141, and in the second state, the elastic element 132 can exert an elastic force on the dynamic spring mechanism 131 to press the movable contact 1313 against the stationary contact 14, thereby improving the stability and reliability of the contact between the movable contact 1313 and the stationary 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 stationary 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.

[0056] 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, and in the first state, the lower iron core 122 is spaced apart from the upper iron core 121, and 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.

[0057] In some embodiments, the position of support element 136 is designed so that, in the second state, support element 136 remains spaced apart from dynamic spring mechanism 131, and the distance between support element 136 and dynamic spring mechanism 131 is smaller in the second state than in the first state. Furthermore, in the second state, the difference between the length of elastic element 132 and its ultimate compression length is greater than the distance between support element 136 and dynamic spring mechanism 131. In some embodiments, the length of elastic element 132 can be equal to the distance between dynamic spring mechanism 131 and push seat 1331.

[0058] Combine Figure 8As 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 element 136 abuts the dynamic spring mechanism 131. At this point, the support element 136 provides support for the dynamic spring mechanism 131, preventing the dynamic spring mechanism 131 from moving relative to the push seat 1331 toward the push seat 1331. In this application, the state in which the supporting element 136 abuts against the dynamic spring mechanism 131 to provide support for the dynamic spring mechanism 131 is referred to as the third state of the high-voltage DC relay 10. In the third state, the dynamic spring mechanism 131, the bracket 135 and the pushing mechanism 133 are relatively fixed, and the electromagnetic assembly 12 bears the impact force of the dynamic spring mechanism 131.

[0059] In the above-mentioned 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 dynamic spring mechanism 131 and the static contact 141 of the static contact 14 to bounce apart due to electrodynamic repulsion, the dynamic spring mechanism 131 can first compress the elastic element 132 until the supporting element 136 abuts the dynamic spring mechanism 131, thereby preventing the dynamic spring mechanism 131 and the pushing mechanism 133 from moving closer to each other. After the movable contact 1313 and the stationary contact 141 bounce apart, the electromotive repulsive force between the movable contact 1313 and the stationary contact 141 disappears. During the process in which the movable spring mechanism 131 moves away from the stationary contact 141 until the support element 136 abuts against the movable spring mechanism 131, the elastic element 132 can effectively buffer the kinetic energy of the movable spring mechanism 131. Furthermore, due to the supporting effect of the support element 136 on the movable spring mechanism 131, the maximum bounce distance between the movable spring mechanism 131 and the stationary contact 141 can be shortened. Therefore, when the support element 136 abuts against the movable spring mechanism 131, the elastic element 132 will not be compressed to the limit compression length, and the impact of the movable spring mechanism 131 on the pushing mechanism 133 will not be too great, thereby preventing the movable assembly 13 from being completely separated from the stationary contact 14 due to excessive impact, thereby preventing damage to the high-voltage DC relay 10.

[0060] Furthermore, the abutment of the support element 136 against the dynamic spring mechanism 131 can prevent the dynamic spring mechanism 131 from moving further away from the static contact 141, thereby reducing the relative distance between the dynamic contact 1313 and the static contact 141. Combined with the cushioning provided by the elastic element 132 to prevent the dynamic assembly 13 from separating from the static contact 14, the distance between the dynamic contact 1313 and the static contact 141 is kept within a predetermined range, thereby preventing arcing between the dynamic contact 1313 and the static contact 141 from generating excessive heat and potentially causing damage or even explosion to the high-voltage DC relay 10. Furthermore, the cushioning provided by the elastic element 132 against the dynamic spring mechanism 131 can also reduce the required holding force required by the dynamic assembly 13 on the electromagnetic assembly 12, allowing the electromagnetic assembly 12 to support the entire dynamic assembly 13 with a smaller holding force. This, in turn, can reduce the number of coil turns and / or the volume of the core of the electromagnetic assembly 12, thereby facilitating a miniaturized design of the high-voltage DC relay 10. Furthermore, support elements 136 are provided on the two first arms 1351 to abut against the dynamic spring mechanism 131 along the movement path of the dynamic spring mechanism 131. The support elements 136 are easy to assemble and have low installation costs, which is conducive to simplifying the structure and preparation process of the dynamic component 13, and is also conducive to the miniaturization and low-cost realization of the high-voltage DC relay 10.

[0061] 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.

[0062] It can be understood that in the present application, the support element 136 contacts the dynamic spring mechanism 131 only in the third state to achieve a supporting effect on the dynamic spring mechanism 131. In other states, the support element 136 will not interfere with the relative movement of the dynamic spring mechanism 131 and the push seat 1331, which is conducive to avoiding the setting of the support element 136 to cause other types of interference such as sliding fit, limit fit, etc. on the movement of the dynamic spring mechanism 131, thereby increasing the risk of the dynamic spring mechanism 131 getting stuck, uneven force or wear and scraping. While achieving the supporting effect, it is also conducive to maintaining the structural reliability of the dynamic component 13 and reducing the impact of the support element 136 on the contact reliability of the dynamic component 13.

[0063] In some embodiments, the elastic element 132 is disposed between the push seat 1331 and the dynamic spring mechanism 131, with its two ends respectively abutting against the dynamic spring mechanism 131 and the push seat 1331, for example, abutting against the lower armature 1314 and the push seat 1331, or abutting against the dynamic spring piece 1311 and the push seat 1331. The two ends of the elastic element 132 may be respectively connected to the dynamic spring mechanism 131 and the push seat 1331. Such an 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, thereby 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, support element 136 is located between dynamic spring mechanism 131 and push seat 1331. In the initial state, support element 136 is spaced apart from both dynamic spring mechanism 131 and push seat 1331. Support element 136 may be located between the two first arms 1351, and is used to abut and support dynamic spring mechanism 131 in the third state. As a result, support element 136 is further away from the contact point between dynamic contact 1313 and static contact 141, which helps reduce the impact of high temperature and ablation spatter on support element 136. For example, this prevents spatter from reducing the distance between support element 136 and dynamic spring mechanism 131, thereby preventing the transition from the second state to the third state from being affected.

[0065] The structure of the elastic element 132 is not limited, as long as it can provide support for the dynamic spring mechanism 131 in the third state. Figure 4 and Figure 5In some embodiments, the support element 136 is a rod-shaped structure, with two first arms 1351 extending through and fixedly connected to each end of the support element 136. Using a rod-shaped support can effectively reduce the manufacturing and assembly costs of the support element 136. Furthermore, in some embodiments, when the support element 136 is a rod-shaped structure, the elastic element 132 can be a leaf spring. The elastic element 132 comprises a base 1321 and two spring arms 1322, each connected to each end of the base 1321. The base 1321 is fixedly mounted on the push seat 1331, and the support element 136 is positioned between the two spring arms 1322. It is understood that the ends of the spring arms 1322 distal from the base 1321 abut against the dynamic spring mechanism 131. When the distance between the dynamic spring mechanism 131 and the push seat 1331 changes, the spring arms 1322 can be driven to undergo elastic deformation. A leaf spring is used as the elastic element 132, and a space for accommodating the support element 136 is formed between the two spring arms 1322, which helps to avoid interference between the elastic element 132 and the support element 136, and improves the structural and performance reliability of the dynamic component 13. According to different elastic matching requirements, the elastic element 132 can be provided with multiple bases 1321, and two spring arms 1322 can be correspondingly provided at both ends of each base 1321. The two adjacent bases 1321 are arranged side by side on the pushing seat 1331. The two adjacent bases 1321 can be connected to each other or form an integrated structure to improve the structural reliability of the elastic element 132. Figure 5 In the illustrated embodiment, the elastic element 132 is taken as an example in which two base portions 1321 are provided.

[0066] Furthermore, in some embodiments, both ends of the movable spring 1311 protrude from the lower armature 1314, the two spring arms 1322 respectively abut the two ends of the movable spring 1311 protruding from the lower armature 1314, and the support element 136 faces the lower armature 1314. This allows for a rational configuration of the structure and positional relationship between the movable spring 1311, the lower armature 1314, the support element 136, and the elastic element 132, thereby improving space utilization efficiency while avoiding interference between the components and enhancing the structural and performance stability of the movable assembly 13.

[0067] See Figure 9 and Figure 10 , Figure 9 and Figure 10Another configuration for the support element 136 is provided. In some embodiments, the support element 136 is a sheet-like structure comprising a sheet-like body 1323 and two protrusions 1324, each connected to opposite edges of the sheet-like body 1323. The sheet-like body 1323 is positioned between the two first arms 1351 and is configured to abut the lower armature 1314 to support the dynamic spring mechanism 131. The two protrusions 1324 are respectively embedded in and fixedly connected to the two first arms 1351. Providing the sheet-like body 1323 to support the dynamic spring mechanism 131 increases the contact area between the support element 136 and the dynamic spring mechanism 131, thereby improving the stability of the dynamic spring mechanism 131 relative to the elastic element 132 and the push seat 1331 in the third state and preventing the dynamic spring mechanism 131 from deflecting.

[0068] In some embodiments, the sheet-like body 1323 is provided with a through hole, and the elastic element 132 is a coil spring, which passes through the sheet-like body 1323 through the through hole. This allows for a rational planning of the structural and positional relationship between the support element 136 and the elastic element 132, optimizing the spatial layout of the dynamic assembly 13, improving space utilization efficiency, and preventing interference between the components.

[0069] In some embodiments, a recessed receiving groove 1333 is formed on one side of the push seat 1331 facing the dynamic spring mechanism 131. The receiving groove 1333 opposes the sheet-like body 1323, and at least a portion of the sheet-like body 1323 is received within the receiving groove 1333. The size of the receiving groove 1333 may be greater than or equal to the size of the lower armature 1314. In the third state, the lower armature 1314 may partially abut the sheet-like body 1323 within the receiving groove 1333. This improves the compactness of the dynamic assembly 13 and enhances space efficiency while maintaining the support function of the support element 136 on the dynamic spring mechanism 131.

[0070] In the present application, the description of the first support arm 1351 as slidingly engaged with the dynamic spring mechanism 131 can be that the opposite sides of the lower armature 1314 slide in engagement with the opposing surfaces of the two first support arms 1351, or that the opposite sides of the dynamic spring piece 1311 slide in engagement with the two first support arms 1351, or that the dynamic spring piece 1311 or a portion of the lower armature 1314 is inserted into 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 dynamic spring mechanism 131 relative to the push seat 1331, it is acceptable. In some embodiments, the first support arm 1351 of the bracket 135 can be directly connected to the push seat 1331, for example, by being integrally formed with the push seat 1331 through insert injection molding, or the first support arm 1351 and the push seat 1331 can be interposed therewith. The dynamic assembly 13 can also include a fixing plate connected to the first support arm 1351 and the push seat 1331, through which the bracket 135 is indirectly connected to the push seat 1331.

[0071] exist Figure 9 and Figure 10 In the embodiment shown, the movable spring 1311 is an integral spring structure. Figure 4 and Figure 5 As shown, in other embodiments, the movable spring 1311 may also include two sub-springs 1312 arranged in parallel and spaced apart from each other. The lower armature 1314 may be simultaneously connected to both sub-springs 1312. The lower armature 1314 may also include two sub-armatures (not shown) spaced apart from each other, with the two sub-armatures correspondingly connected to the two sub-springs 1312. Thus, each movable contact 1313 of the movable spring 1311 can be formed by the corresponding positions of the two sub-springs 1312. This arrangement allows the two sub-springs 1312 to provide more stable electrical contact, reducing contact failures caused by wear or damage to a single spring. It also shares the mechanical load of the movable contact 1313, reducing stress on a single spring, and improving the durability of the high-voltage DC relay 10. It also provides more uniform current distribution, reduces arcing and contact resistance, and improves electrical contact performance. Furthermore, when one of the sub-reeds 1312 fails, the other sub-reed 1312 can still realize on-off control of the circuit with the static contact 141 , thereby improving the performance reliability of the high-voltage DC relay 10 .

[0072] 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.

[0073] 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 assembly includes a dynamic spring mechanism, a pushing mechanism, an elastic element, a bracket and a supporting element. The dynamic spring mechanism is provided with a dynamic contact opposite to the static contact. The dynamic spring mechanism is elastically matched with the pushing mechanism through the elastic element. The bracket includes two first arms, and the two first arms are respectively located on opposite sides of the dynamic spring mechanism in the direction of movement relative to the pushing mechanism. The first arms are connected to the pushing mechanism and slidably matched with the dynamic spring mechanism. The two ends of the supporting element are respectively connected to the two first arms. The supporting element is partially opposite to the dynamic spring mechanism and is arranged at a distance. When the dynamic contact and the static contact bounce open under the action of a short-circuit current, the supporting element is used to abut the dynamic spring mechanism on the path where the dynamic spring mechanism moves toward the pushing mechanism.

2. The high-voltage DC relay according to claim 1, characterized in that: The elastic element is located between the dynamic spring mechanism and the pushing mechanism, and two ends of the elastic element are respectively in contact with the dynamic spring mechanism and the pushing mechanism.

3. The high voltage DC relay according to claim 1, characterized in that: The supporting element is located between the dynamic spring mechanism and the pushing mechanism.

4. The high-voltage DC relay according to claim 1, characterized in that: The elastic element includes a leaf spring, which has a base and two spring arms. The two spring arms are respectively connected to two ends of the base. The base is fixed on the pushing mechanism, and the supporting element is located between the two spring arms.

5. The high-voltage DC relay according to claim 4, characterized in that: The supporting element is a rod-shaped structure, and two ends of the supporting element are respectively passed through the two first supporting arms.

6. The high-voltage DC relay according to claim 4, characterized in that: The dynamic spring mechanism includes a dynamic spring piece and a lower armature. The dynamic contact is arranged on the side of the dynamic spring piece facing the static contact. The lower armature is fixedly connected to the dynamic spring piece. The two ends of the dynamic spring piece protrude from the lower armature. The two spring arms respectively abut against the two ends of the dynamic spring piece protruding from the lower armature. The supporting element is opposite to the lower armature.

7. The high voltage DC relay according to claim 1, characterized in that: The supporting element is a sheet-like structure, comprising a sheet-like main body and two protrusions, wherein the two protrusions are respectively connected to two opposite edges of the sheet-like main body, the sheet-like main body is located between the two first arms, and the two protrusions are respectively embedded in the two first arms.

8. The high-voltage DC relay according to claim 7, characterized in that: The sheet-like body is provided with a through hole, the elastic element comprises a coil spring, and the elastic element passes through the sheet-like body through the through hole.

9. The high-voltage DC relay according to claim 7, characterized in that: A receiving groove is concavely provided on one side of the pushing seat of the pushing mechanism facing the dynamic spring mechanism. The receiving groove is arranged corresponding to the sheet-like body, and at least a portion of the sheet-like body is accommodated in the receiving groove.

10. The high-voltage DC relay according to claim 1, characterized in that: The dynamic spring mechanism includes a dynamic spring piece and a lower armature, the dynamic contact is arranged on the side of the dynamic spring piece facing the static contact, the lower armature is fixedly connected to the dynamic spring piece, and the supporting element is opposite to either the lower armature or the dynamic spring piece.

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 bracket further includes a second arm connected to the two first arms. The second arm is located on a side of the dynamic spring mechanism 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 10, characterized in that: The pushing mechanism can drive the dynamic spring mechanism to move in a direction approaching the static contact, so that the high-voltage DC relay has a first state and a second state. In the first state, the dynamic contact is just in contact with the static contact. In the second state, the dynamic contact is pressed against the static contact by the elastic element. During the switching from the first state to the second state, the pushing mechanism moves relative to the dynamic spring mechanism in a direction approaching the static contact. The distance between the supporting element and the dynamic spring mechanism 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, a difference between a dimension of the elastic element in a moving direction of the dynamic spring mechanism relative to the pushing mechanism and a maximum compression length of the elastic element is greater than a distance between the supporting element and the dynamic spring mechanism.

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 supporting element abuts against the dynamic spring mechanism to prevent the dynamic spring mechanism and the pushing mechanism 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 10, characterized in that: The high-voltage DC relay also includes an electromagnetic assembly, and the pushing mechanism includes a pushing seat and a pushing rod connected to the side of the pushing seat facing away from the dynamic spring mechanism. The dynamic spring mechanism elastically cooperates with the pushing seat through the elastic element, and the pushing rod is inserted into the electromagnetic assembly. The electromagnetic assembly can drive the pushing seat to move toward or away from the static contact through the pushing rod.

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