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, an elastic element and a fastener, the movable spring mechanism is provided with a movable contact opposite to the static contact, the movable spring mechanism is elastically matched with the pushing mechanism through the elastic element, the movable spring mechanism can move in the direction close to the pushing mechanism to extrude the elastic element, and the movable spring mechanism comprises a movable reed and a lower armature; and the fastener penetrates through the lower armature and is connected with the movable contact spring so as to fix the lower armature on the movable contact spring, and the fastener protrudes out of one side, facing the pushing mechanism, of the movable spring mechanism and is used for abutting against the pushing mechanism on a moving path, far away from the static contact, of the movable spring mechanism when the movable spring mechanism is bounced off relative to the static contact due to short-circuit current. 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 movable assembly includes a movable spring mechanism, a pushing mechanism, an elastic element and a fastener. The movable spring mechanism is provided with a movable contact opposite to the static contact. The movable spring mechanism is elastically matched with the pushing mechanism through the elastic element. The movable spring mechanism can move in a direction close to the pushing mechanism to squeeze the elastic element. The movable spring mechanism includes a movable spring piece and a lower armature. The fastener passes through the lower armature and is connected to the movable spring piece to fix the lower armature on the movable spring piece. The fastener protrudes from the side of the movable spring mechanism facing the pushing mechanism. When the movable contact and the static contact bounce open under the action of a short-circuit current, the fastener is used to abut the pushing mechanism on the path of the movable spring mechanism moving away from the static contact.

[0008] In the aforementioned high-voltage DC relay, when the circuit connected to the high-voltage DC relay is short-circuited or overloaded, 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 fastener abuts the push mechanism, thereby preventing the movable spring mechanism and the push 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 fastener abuts the push mechanism. Furthermore, due to the supporting effect of the fastener, the maximum spring-to-close distance between the movable spring mechanism and the static contact can be shortened. Therefore, when the fastener abuts the push mechanism, the elastic element will not be compressed to its maximum compression length, and the impact of the movable spring mechanism on the push mechanism will not be excessive, thus preventing the movable assembly from being completely separated from the static contact due to excessive impact, thereby damaging the high-voltage DC relay.

[0009] Furthermore, the abutment of the fastener against the push mechanism can prevent the movable spring mechanism from moving further away from the static contact, which helps reduce the distance between the movable and static contacts. Combined with the design of the elastic element to cushion the movable assembly from separating from the static contact, the distance between the movable and static contacts is not too far, thereby helping to prevent arcing between the movable and static contacts from generating excessive heat, which can damage or even explode the high-voltage DC relay. Furthermore, the elastic element's cushioning of the movable spring mechanism can also reduce the holding force required by the movable assembly for the electromagnetic assembly, allowing the electromagnetic assembly to support the entire movable assembly with less holding force, thereby helping to reduce the number of coil turns and / or the volume of the iron core of the electromagnetic assembly, facilitating the miniaturization of the high-voltage DC relay. Furthermore, by using the fastener that secures the lower armature to the movable spring piece and simultaneously abuts the push mechanism along the movable spring mechanism's motion path, no additional parts are required to support the movable spring mechanism, which helps reduce the number of parts, simplify the structure and manufacturing process of the movable assembly, and also facilitate the miniaturization and low-cost implementation of the high-voltage DC relay.

[0010] In one embodiment, the lower armature includes a first armature portion and a second armature portion, the first armature portion is located on the side of the movable spring piece facing the pushing mechanism, the second armature portion is located on the circumferential side of the movable spring piece relative to the movement direction of the pushing mechanism, and the fastener passes through the first armature portion and protrudes from the side of the first armature portion facing away from the movable spring piece.

[0011] In one embodiment, 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 pushing seat has an abutment surface facing the dynamic spring mechanism, the fastener is opposite to the abutment surface, and can abut against the abutment surface on the path of the dynamic spring mechanism moving away from the static contact.

[0012] In one embodiment, the elastic element is located between the first armature portion and the pushing seat, and two ends thereof are respectively in contact with the first armature portion and the pushing seat.

[0013] In one embodiment, the dynamic assembly is provided with two fasteners, and the two fasteners are respectively located on two opposite sides of the elastic element in the axial direction.

[0014] In one embodiment, the pushing mechanism further includes a limiting protrusion protruding from the pushing seat toward the dynamic spring mechanism, one end of the elastic element is sleeved on the limiting protrusion, and the abutting surface is arranged around the limiting protrusion.

[0015] In one embodiment, an end surface of the fastener away from the dynamic spring mechanism is parallel to the abutting surface.

[0016] In one embodiment, the dynamic component also includes a bracket, and the bracket includes two first arms, and the two first arms are respectively located on two opposite sides of the elastic element in the axial direction, and the two first arms are both connected to the pushing mechanism and slidingly cooperate with the dynamic spring mechanism.

[0017] 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;

[0018] Wherein, the upper armature is arranged outside the moving assembly and fixed relative to the static contact; or,

[0019] 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.

[0020] 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. The distance between the pushing mechanism and the fastener in the second state is smaller than that in the first state.

[0021] 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 pushing mechanism and the fastener.

[0022] 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 fastener abuts against the pushing 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.

[0023] 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

[0024] Figure 1 Schematic diagram of the structure of a high-voltage DC relay in an initial state in some embodiments.

[0025] Figure 2 for Figure 1 The structural diagram of the dynamic component in the high-voltage DC relay shown in FIG.

[0026] Figure 3 for Figure 2 Exploded diagram of the moving assembly shown.

[0027] Figure 4 for Figure 2 Schematic diagram of the structure of the dynamic spring mechanism and fasteners in the dynamic assembly shown.

[0028] Figure 5 for Figure 4 Exploded view of the dynamic spring mechanism and fasteners shown.

[0029] Figure 6 Schematic diagram of the structure of a high-voltage DC relay in a first state in some embodiments.

[0030] Figure 7 Schematic diagram of the structure of the high-voltage DC relay in the second state in some embodiments.

[0031] Figure 8 Schematic diagram of the structure of the high-voltage DC relay in the third state in some embodiments.

[0032] Reference numerals:

[0033] 10. High-voltage DC relay; 11. Yoke plate; 12. Electromagnetic assembly; 121. Upper iron core; 122. Lower iron core; 13. Moving assembly; 131. Moving spring mechanism; 1311. Moving spring; 1313. Moving contact; 1314. Lower armature; 1315. First armature portion; 1316. Second armature portion; 132. Elastic element; 133. Pushing mechanism; 1331. Pushing seat; 1332. Pushing rod; 1333. Abutment surface; 1334. Limiting protrusion; 135. Bracket; 1351. First arm; 136. Fastener; 14. Static contact; 141. Static contact; 142. Insulating cover; 143. Upper armature. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] To solve the above problems, the present application provides a high-voltage DC relay.

[0042] 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 exploded view of the moving assembly 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 moving assembly 13, a static contact 14, and an insulating cover 142. The insulating cover 142 is disposed on the yoke plate 11, and the static contact 14 is disposed on the insulating cover 142. Two static contacts 14 may be disposed at intervals, and both static contacts 14 have a static contact point 141. The insulating cover 142 includes, but is not limited to, an insulating cover such as a ceramic cover. The moving assembly 13 includes a dynamic spring mechanism 131, an elastic element 132, and a driving mechanism 133. The dynamic spring mechanism 131 has two dynamic contacts 1313 that are opposite the two static contacts 141. The dynamic spring mechanism 131 is elastically connected to the pushing mechanism 133 via the elastic element 132. That is, the dynamic spring mechanism 131 can move toward the pushing mechanism 133 to compress the elastic element 132 together with the pushing mechanism 133, and can also move away from the pushing 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 dynamic spring mechanism 131. By driving the pushing 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.

[0043] 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.

[0044] In some embodiments, the pushing mechanism 133 includes a pushing seat 1331 and a pushing rod 1332 connected to the pushing seat 1331 on a side 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 disposed around the upper iron core 121 and the lower iron core 122. The upper iron core 121 is fixedly disposed 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 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.

[0045] In some embodiments, the dynamic assembly 13 further includes a bracket 135, which may include two first arms 1351. The two first arms 1351 are located on opposite sides of the elastic element 132 in the axial direction 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, allowing the dynamic spring mechanism 131 to move relative to the push seat 1331 in a direction 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 undergo elastic deformation. The two first arms 1351 provide guidance for 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 bracket 135 may further include a second arm (not shown) connected to the two first arms 1351. The second arm may be disposed on the 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 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.

[0046] 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 1 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. 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 bracket 135 may not be provided with a second arm. The upper armature 143 can limit 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, i.e., facing away from the static contact 141, protrudes outside the insulating cover 142. In other embodiments, when the bracket 135 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 dynamic spring mechanism 131 .

[0047] 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 bracket 135 can also be provided with a second arm. The upper armature 143 and the movable spring 1311 can be separated by the second arm of the bracket 135. The second arm then defines the limit position of the movable spring mechanism 131's movement away from the push seat 1331.

[0048] Further, combined with Figure 1 、 Figure 4 and Figure 5As shown, in some embodiments, the movable assembly 13 further includes a fastener 136. The fastener 136 passes through the lower armature 1314 and connects to the movable spring 1311, thereby securing the lower armature 1314 to the movable spring 1311. In other words, the fastener 136 serves as a structural element on the movable spring mechanism 131 to secure the lower armature 1314 and the movable spring 1311 to each other. The fastener 136 protrudes from the side of the movable spring mechanism 131 facing the push mechanism 133 and is configured to abut the push seat 1331 as the movable spring mechanism 131 moves away from the stationary contact 14 when the movable contact 1313 and the stationary contact 141 spring apart under the action of a short-circuit current. When the fastener 136 abuts the push seat 1331, the fastener 136 prevents the movable spring mechanism 131 and the push seat 1331 from moving closer together. 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. In the present application, the fastener 136 includes, but is not limited to, any suitable connecting element such as a rivet, as long as it can fix the lower armature 1314 to the dynamic spring piece 1311 and can protrude from the lower armature 1314 to abut the push seat 1331.

[0049] 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 fastener 136 is spaced apart from the push seat 1331. 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.

[0050] 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 movable contact 1313 to press the movable spring mechanism 131 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.

[0051] 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.

[0052] In some embodiments, the length of the fastener 136 protruding from the dynamic spring mechanism 131 is designed so that, in the second state, the fastener 136 remains spaced apart from the push seat 1331, and the distance between the push seat 1331 and the fastener 136 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 fastener 136 and the push seat 1331. In some embodiments, the length of the elastic element 132 can be equal to the distance between the dynamic spring mechanism 131 and the push seat 1331.

[0053] 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 fastener 136 abuts the push seat 1331. At this point, the fastener 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 fastener 136 abuts the pushing seat 1331 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.

[0054] It can be understood that in the present application, the fastener 136 contacts the push seat 1331 only in the third state to achieve a supporting effect on the dynamic spring mechanism 131. In other states, the fastener 136 will not interfere with the relative movement of the dynamic spring mechanism 131 and the push seat 1331, which is beneficial to avoid the setting of the fastener 136 causing 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 beneficial to maintain the structural reliability of the dynamic component 13 and reduce the impact of the fastener 136 on the contact reliability of the dynamic component 13.

[0055] 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 spring apart due to electrodynamic repulsion, the dynamic spring mechanism 131 can first compress the elastic element 132 until the fastener 136 abuts the pushing seat 1331, thereby preventing the dynamic spring mechanism 131 and the pushing mechanism 133 from moving closer to each other. After the moving contact 1313 and the static contact 141 bounce apart, the electric repulsive force between the moving contact 1313 and the static contact 141 disappears. In the process of the moving spring mechanism 131 moving in the direction away from the static contact 141 until the fastener 136 abuts the pushing seat 1331, the elastic element 132 can effectively buffer the kinetic energy of the moving spring mechanism 131. Moreover, due to the supporting effect of the fastener 136 on the moving spring mechanism 131, the maximum bounce distance between the moving spring mechanism 131 and the static contact 141 can be shortened. Therefore, when the fastener 136 abuts the pushing mechanism 133, the elastic element 132 will not be compressed to the limit compression length, and the impact of the moving spring mechanism 131 on the pushing mechanism 133 will not be too great, thereby preventing the moving component 13 from being completely separated from the static contact 14 due to excessive impact, thereby preventing damage to the high-voltage DC relay 10.

[0056] In addition, the abutment of the fastener 136 on the pushing mechanism 133 can prevent the dynamic spring mechanism 131 from continuing to move away from the static contact 141, which is beneficial to reducing the relative bounce distance between the dynamic contact 1313 and the static contact 141. Combined with the buffering of the elastic element 132 to prevent the dynamic component 13 from separating from the static contact 14, the distance between the dynamic contact 1313 and the static contact 141 will not be too far, which is beneficial to avoid the arcing phenomenon between the dynamic contact 1313 and the static contact 141 to generate excessive heat and cause damage to the high-voltage DC relay 10 or even explosion.

[0057] 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 design of the high-voltage DC relay 10.

[0058] Furthermore, the fastener 136 that fixes the lower armature 1314 to the dynamic spring piece 1311 simultaneously abuts the pushing mechanism 133 on the movement path of the dynamic spring mechanism 131, eliminating the need for additional parts to support the dynamic spring mechanism 131. This helps reduce the number of parts, simplifies the structure and manufacturing process of the dynamic assembly 13, and is also beneficial for miniaturization and low-cost realization of the high-voltage DC relay 10.

[0059] 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.

[0060] 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 the dynamic spring mechanism 131 and the push seat 1331, for example, abutting the lower armature 1314 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. Such an arrangement can rationally plan 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.

[0061] Please see again Figure 1-Figure 4 As shown, in some embodiments, the lower armature 1314 includes a first armature portion 1315 and a second armature portion 1316. The first armature portion 1315 is located on the side of the movable spring 1311 facing the driving mechanism 133, and the second armature portion 1316 is located on the side of the movable spring 1311 relative to the direction of motion of the driving mechanism 133. For example, the second armature portion 1316 includes 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. The fastener 136 passes through the first armature portion 1315 and protrudes from the side of the first armature portion 1315 facing away from the movable spring 1311. As a result, the portion of the fastener 136 that abuts the driving seat 1331 is located between the first armature portion 1315 and the driving seat 1331, adapting to the spatial layout of the movable spring mechanism 131 and the driving mechanism 133. The shorter portion of the first armature portion 1315 protrudes to achieve abutment against the driving seat 1331. At the same time, the part of the fastener 136 protruding from the first armature part 1315 is far away from the contact position of the moving contact 1313 and the static contact 141, which is beneficial to reducing the influence of high temperature and ablation splashes on the fastener 136, for example, avoiding the distance between the fastener 136 and the push seat 1331 being reduced due to splashes, thereby affecting the switching from the second state to the third state.

[0062] In some embodiments, the push seat 1331 has an abutment surface 1333 facing the dynamic spring mechanism 131. The fastener 136 is opposite the abutment surface 1333 and can abut against the abutment surface 1333 as the dynamic spring mechanism 131 moves away from the static contact 14. Furthermore, in some embodiments, the end surface of the fastener 136 distal to the dynamic spring mechanism 131 is parallel to the abutment surface 1333, and the end surface of the fastener 136 distal to the dynamic spring mechanism 131 is configured to abut against the abutment surface 1333. In this manner, the fastener 136 can abut against the abutment surface 1333 in surface contact, which helps to improve the relative stability between the fastener 136 and the push seat 1331 when abutting the abutment surface 1333, and prevents relative deflection between the fastener 136 and the push seat 1331.

[0063] In some embodiments, the dynamic assembly 13 is provided with two fasteners 136, located on opposite sides of the elastic element 132 in the axial direction. The end surfaces of the two fasteners 136 facing away from the dynamic spring mechanism 131 can simultaneously abut against the abutment surface 1333 of the push seat 1331, thereby providing more stable and reliable support for the dynamic spring mechanism 131. The provision of the two fasteners 136 on opposite sides of the elastic element 132 in the axial direction provides uniform support for the dynamic spring mechanism 131. In conjunction with the guiding effect of the first support arm 1351 on the dynamic spring mechanism 131, the stability and reliability of the movement of the dynamic spring mechanism 131 relative to the push seat 1331 can be improved, preventing the dynamic spring mechanism 131 from swinging, and also preventing interference between the fasteners 136 and the elastic element 132. Of course, in some embodiments, the dynamic component 13 may also be provided with a larger number of fasteners 136, for example, three, four or other numbers of fasteners 136, and the multiple fasteners 136 are spaced and evenly arranged in sequence along the circumference of the elastic element 132, which can not only improve the connection reliability between the lower armature 1314 and the dynamic spring piece 1311, but also improve the stability and reliability of the supporting effect of the fasteners 136 on the dynamic spring mechanism 131.

[0064] refer to Figure 3 As shown, in some embodiments, the pushing mechanism 133 further includes a limiting protrusion 1334 provided on the side of the pushing seat 1331 facing the dynamic spring mechanism 131. The end of the elastic element 132 near the pushing seat 1331 is sleeved on the limiting protrusion 1334, and the abutting surface 1333 is disposed around the limiting protrusion 1334. This helps to improve the reliability of the connection between the elastic element 132 and the pushing mechanism 133, and also allows for the rational planning of the spatial layout between the elastic element 132, the fastener 136, and the pushing mechanism 133, further reducing the risk of interference between the fastener 136 and the elastic element 132.

[0065] In this application, the description of the first support arm 1351 as slidingly engaged with the dynamic spring mechanism 131 can refer to the opposite sides of the lower armature 1314, i.e., the opposite sides of the second armature portion 1316, slidingly engaging with the opposing surfaces of the two first support arms 1351. Alternatively, the opposite sides of the dynamic spring piece 1311 can slidely engage with the two first support arms 1351. Alternatively, the dynamic spring piece 1311 or a portion of the second armature portion 1316 can be 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 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. The dynamic assembly 13 may also include a fixing plate (not shown) connected to the first support arm 1351 and the push seat 1331, indirectly connecting the bracket 135 to the push seat 1331 via the fixing plate.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 movable assembly includes a movable spring mechanism, a pushing mechanism, an elastic element and a fastener. The movable spring mechanism is provided with a movable contact opposite to the static contact. The movable spring mechanism is elastically matched with the pushing mechanism through the elastic element. The movable spring mechanism can move in a direction close to the pushing mechanism to squeeze the elastic element. The movable spring mechanism includes a movable spring piece and a lower armature. The fastener passes through the lower armature and is connected to the movable spring piece to fix the lower armature on the movable spring piece. The fastener protrudes from the side of the movable spring mechanism facing the pushing mechanism. When the movable contact and the static contact bounce open under the action of a short-circuit current, the fastener is used to abut the pushing mechanism on the path of the movable spring mechanism moving away from the static contact.

2. The high voltage DC relay according to claim 1, characterized in that: The lower armature includes a first armature part and a second armature part, the first armature part is located on the side of the movable spring piece facing the pushing mechanism, and the second armature part is located on the circumferential side of the movable spring piece relative to the movement direction of the pushing mechanism, and the fastener passes through the first armature part and protrudes from the side of the first armature part facing away from the movable spring piece.

3. The high voltage DC relay according to claim 2, characterized in that: 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 pushing seat has an abutment surface facing the dynamic spring mechanism. The fastener is opposite to the abutment surface and can abut against the abutment surface on the path of the dynamic spring mechanism moving away from the static contact.

4. The high-voltage DC relay according to claim 3, characterized in that: The elastic element is located between the first armature portion and the pushing seat, and two ends of the elastic element are respectively in contact with the first armature portion and the pushing seat.

5. The high-voltage DC relay according to claim 4, characterized in that: The dynamic assembly is provided with two fasteners, and the two fasteners are respectively located on two opposite sides of the elastic element in the axial direction.

6. The high-voltage DC relay according to claim 5, characterized in that: The pushing mechanism further includes a limiting protrusion protruding from the pushing seat toward the dynamic spring mechanism. One end of the elastic element is sleeved on the limiting protrusion, and the abutting surface is arranged around the limiting protrusion.

7. The high-voltage DC relay according to claim 3, characterized in that: An end surface of the fastener away from the dynamic spring mechanism is parallel to the abutting surface.

8. The high-voltage DC relay according to any one of claims 1 to 7, characterized in that: The dynamic component also includes a bracket, which includes two first arms. The two first arms are respectively located on two opposite sides of the elastic element in the axial direction. The two first arms are both connected to the pushing mechanism and slidingly cooperate with the dynamic spring mechanism.

9. The high-voltage DC relay according to claim 8, 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.

10. The high-voltage DC relay according to any one of claims 1 to 7, 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 pushing mechanism and the fastener in the second state is smaller than that in the first state.

11. The high-voltage DC relay according to claim 10, characterized in that: In the second state, a difference between the length of the elastic element and the ultimate compression length of the elastic element is greater than a distance between the pushing mechanism and the fastener.

12. The high-voltage DC relay according to claim 10, 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 fastener abuts against the pushing 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.

13. The high-voltage DC relay according to any one of claims 1 to 7, 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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