High-voltage direct current relay

Abstract

The present application relates to a high-voltage direct current relay (10), comprising a static contact (14) and a moving component (13). The moving component (13) comprises a moving spring mechanism (131), a pushing mechanism (133), an elastic element (132), a bracket (135), and a support element (136); the moving spring mechanism (131) elastically cooperates with the pushing mechanism (133) by means of the elastic element (132); first support arms (1351) of the bracket (135) are connected to the pushing mechanism (133) and slidably cooperate with the moving spring mechanism (131); the support element (136) is connected to the two first support arms (1351); when the moving contact (1313) and the static contact (141) spring open under the action of a short-circuit current, the support element (136) is used for abutting against the moving spring mechanism (131) on the path along which the moving spring mechanism (131) moves towards the pushing mechanism (133).

Description

High voltage DC relay

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on November 5, 2024, application number 2024115705846, entitled "High Voltage DC Relay", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of relay technology, and in particular to a high-voltage DC relay. Background Technology

[0004] High-voltage DC relays, as a new type of automatic electrical switch, can achieve normally open or normally closed states through electromagnetic holding force. Current high-voltage DC relays typically consist of an electromagnetic component, a moving component, and a stationary contact. The moving contact on the moving spring of the moving component and the stationary contact on the stationary contact together form the contact part of the high-voltage DC relay. The electromagnetic component includes a coil, an upper iron core, and a lower iron core. When the coil is energized, it magnetizes the lower iron core, causing the lower iron core to attract the upper iron core, thereby driving the moving component closer to the stationary contact until the moving contact on the moving component and the stationary contact on the stationary contact make contact, thus completing the circuit.

[0005] However, current high-voltage DC relays, when a short circuit or overload occurs, will have their moving and stationary contacts spring apart due to excessive electrodynamic repulsion, causing arcing between them and leading to relay damage. Industries using high-voltage circuits, such as the new energy sector, are increasingly demanding miniaturization and short-circuit protection for high-voltage DC relays. Summary of the Invention

[0006] According to various embodiments of this application, a high-voltage DC relay is provided.

[0007] A high-voltage DC relay includes a stationary contact and a moving assembly. The stationary contact has a stationary contact point; the moving assembly includes a moving spring mechanism, a pushing mechanism, an elastic element, a bracket, and a supporting element. The moving spring mechanism has a moving contact point opposite to the stationary contact point. The moving spring mechanism is elastically engaged with the pushing mechanism through the elastic element. The bracket includes two first arms, which are located on opposite sides of the moving spring mechanism in the direction of movement relative to the pushing mechanism. The first arms are connected to the pushing mechanism and are slidably engaged with the moving 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 moving spring mechanism and spaced apart. When the moving contact point and the stationary contact point spring apart under the action of a short-circuit current, the supporting element is used to abut against the moving spring mechanism on the path in which the moving spring mechanism moves towards the pushing mechanism.

[0008] In one embodiment, the elastic element is located between the moving spring mechanism and the pushing mechanism, with its two ends abutting against the moving spring mechanism and the pushing mechanism, respectively.

[0009] In one embodiment, the support element is located between the moving spring mechanism and the pushing mechanism.

[0010] In one embodiment, the elastic element includes a leaf spring having a base and two spring arms, the two spring arms being respectively connected to both ends of the base, the base being fixedly mounted on the pushing mechanism, and the support element being located between the two spring arms.

[0011] In one embodiment, the support element is a rod-shaped structure, with its two ends respectively passing through the two first arms.

[0012] In one embodiment, the moving spring mechanism includes a moving spring and a lower armature. The moving contact is located on the side of the moving spring facing the stationary contact. The lower armature is fixedly connected to the moving spring. Both ends of the moving spring protrude from the lower armature. The two spring arms abut against the two ends of the moving spring protruding from the lower armature. The support element is opposite to the lower armature.

[0013] In one embodiment, the support element is a sheet-like structure, comprising a sheet-like body and two protrusions, the two protrusions being respectively connected to two opposite edges of the sheet-like body, the sheet-like body being located between two first arms, and the two protrusions being respectively embedded in the two first arms.

[0014] In one embodiment, the sheet-like body has a through hole, and the elastic element includes a helical spring, which passes through the through hole into the sheet-like body.

[0015] In one embodiment, the push seat of the push mechanism is recessed with a receiving groove on the side facing the moving spring mechanism, the receiving groove is provided corresponding to the sheet-like body, and at least a portion of the sheet-like body is received in the receiving groove.

[0016] In one embodiment, the moving spring mechanism includes a moving spring and a lower armature, the moving contact is located on the side of the moving spring facing the stationary contact, the lower armature is fixedly connected to the moving spring, and the support element is opposite to either the lower armature or the moving spring.

[0017] In one embodiment, the high-voltage DC relay further includes an upper armature opposite to the lower armature, wherein when the moving contact and the stationary contact are opposite each other, the upper armature and the lower armature can be magnetized and attract each other;

[0018] Wherein, the upper armature is disposed outside the moving assembly and fixed relative to the stationary contact; or...

[0019] The bracket also includes a second arm connected to the two first arms. The second arm is located on the side of the moving spring mechanism facing away from the pushing mechanism, and the upper armature is fixed to the second arm.

[0020] In one embodiment, the pushing mechanism can drive the moving spring mechanism to move towards the stationary contact, so that the high-voltage DC relay has a first state and a second state. In the first state, the moving contact is in contact with the stationary contact. In the second state, the moving contact is pressed against the stationary contact by the elastic element. During the switching from the first state to the second state, the pushing mechanism moves relative to the moving spring mechanism towards the stationary contact. The distance between the support element and the moving spring mechanism is smaller in the second state than in the first state.

[0021] In one embodiment, in the second state, the difference between the dimension of the elastic element in the direction of motion of the moving spring mechanism relative to the pushing mechanism and the ultimate compression length of the elastic element is greater than the distance between the support element and the moving spring mechanism.

[0022] In one embodiment, the moving spring mechanism is able to spring away from the stationary contact under the electric repulsive force generated by the short-circuit current, so that the high-voltage DC relay switches from the second state to the third state. In the third state, the support element abuts against the moving spring mechanism to prevent the moving spring mechanism and the pushing mechanism from getting close to each other. The length of the elastic element is greater than the ultimate compression length of the elastic element.

[0023] In one embodiment, the high-voltage DC relay further includes an electromagnetic component, and the actuating mechanism includes a actuating seat and a actuating rod connected to the side of the actuating seat facing away from the moving spring mechanism. The moving spring mechanism is elastically engaged with the actuating seat through the elastic element, and the actuating rod is inserted into the electromagnetic component. The electromagnetic component can drive the actuating seat to move toward or away from the stationary contact through the actuating rod.

[0024] Details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

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

[0027] Figure 2 is a cross-sectional view of the high-voltage DC relay shown in Figure 1 along the AA direction.

[0028] Figure 3 is a schematic diagram of the structure of the moving component in some embodiments.

[0029] Figure 4 is a schematic diagram of the moving component in some other embodiments.

[0030] Figure 5 is an explosion diagram of the moving component described in Figure 4.

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

[0032] Figure 7 is a schematic diagram of the structure of the high voltage DC relay in the second state in some embodiments.

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

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

[0035] Figure 10 is an exploded schematic diagram of the moving component shown in Figure 9. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] As high-voltage DC relays are increasingly used in various fields, the industry's requirements for their heat loss resistance, short-circuit protection, and voltage are also becoming more stringent. Specifically, the current and voltage of the circuits in which high-voltage DC relays are used are increasing. For example, in new energy vehicles, as the required driving range increases, the capacity of battery packs in these vehicles is also increasing, leading to higher current and voltage requirements for the high-voltage DC relays used in the battery pack circuits. Therefore, when the circuit is short-circuited or overloaded, the electro-repulsive force generated between the moving and stationary contacts of the high-voltage DC relay is relatively large, which can easily cause the moving and stationary contacts to spring apart by a large distance. For example, the moving and stationary contacts may spring apart to the point where the moving spring mechanism compresses the elastic element to its limit, and then transmit the impact force to the push mechanism and the electromagnetic component. At this point, if the impact force is too large, it can easily cause the electromagnetic component and the moving component to detach from the stationary contact, resulting in damage to the high-voltage DC relay. Alternatively, it can cause the moving and stationary contacts to spring apart too far, resulting in arcing between the moving and stationary contacts, generating excessive heat and burning out the high-voltage DC relay, or even causing the high-voltage DC relay to explode. However, in traditional high-voltage DC relays, to increase the holding force of the electromagnetic component on the moving component to prevent insufficient holding force from detaching from the stationary contact or to reduce the spring-off distance between the moving and stationary contacts, it is usually necessary to increase the number of coil turns, which increases the cost and size of the electromagnetic component, thus increasing the size and cost of the high-voltage DC relay.

[0043] To address the aforementioned problems, this application provides a high-voltage DC relay.

[0044] Please refer to Figures 1-4. Figure 1 shows a structural schematic diagram of the high-voltage DC relay 10 in some embodiments of this application. Figure 2 is a cross-sectional schematic diagram of the high-voltage DC relay 10 shown in Figure 1 along the AA direction. Figures 3 and 4 are structural schematic diagrams 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, stationary contacts 14, and an insulating cover 142. The insulating cover 142 is disposed on the yoke plate 11, and the stationary contacts 14 are disposed on the insulating cover 142. Two stationary contacts 14 may be arranged at intervals, and each of the two stationary contacts 14 is provided with a stationary contact point 141. The insulating cover 142 includes, but is not limited to, an insulating shell such as a ceramic cover. Referring to Figures 2 and 5, the moving component 13 includes a moving spring mechanism 131, an elastic element 132, and a pushing mechanism 133. The moving spring mechanism 131 is provided with two moving contacts 1313 that are one-to-one opposite to the two stationary contacts 141. The moving spring mechanism 131 elastically engages with the pushing mechanism 133 via the elastic element 132. This means that the moving spring mechanism 131 can move towards the pushing mechanism 133 to jointly compress the elastic element 132 with the pushing mechanism 133, or it can move away from the pushing mechanism 133 to release the elastic element 132. The electromagnetic component 12 is located on the side of the yoke plate 11 facing away from the moving spring mechanism 131. It can drive the pushing mechanism 133 to move the moving component 13 as a whole towards or away from the stationary contact 141, thereby making the moving contact 1313 contact the stationary contact 141 to achieve circuit connection, or making the moving contact 1313 disengage from the stationary contact 141 to achieve circuit disconnection.

[0045] It is understood that the high-voltage DC relay 10 can be used as a switching element in a circuit. The stationary contact 14 may have a lead-out terminal electrically connected to the two stationary contacts 141, and the lead-out terminal is electrically connected to the circuit. When the moving contact 1313 and the stationary contact 141 are in contact one by one, the moving contact 1313 conducts the two stationary contacts 141 to make the circuit conduct, and the high-voltage DC relay 10 is turned on. When the moving contact 1313 is disengaged from the stationary contact 141, the two stationary contacts 141 are electrically isolated, the circuit is broken, and the high-voltage DC relay 10 is turned off. In some embodiments, the high-voltage DC relay 10 may also include a housing (not shown) covering the insulating cover 142 and the stationary contact 14. The stationary contact 14 can be led out to the outside of the housing through conductive structures such as electrodes and leads to be electrically connected to the circuit. The material of the housing includes, but is not limited to, insulating materials such as plastic. The housing can isolate the stationary contact 14, the insulating cover 142 and the moving component 13 from the outside world to achieve insulation protection.

[0046] In some embodiments, the pushing mechanism 133 includes a pushing seat 1331 and a pushing rod 1332 connected to the side of the pushing seat 1331 facing away from the moving spring mechanism 131. The electromagnetic assembly 12 may include an upper iron core 121, a lower iron core 122, and a coil arranged around the upper iron core 121 and the lower iron core 122. The upper iron core 121 is fixedly disposed on the yoke plate 11, and the coil is fixed relative to the yoke plate 11. The lower iron core 122 is opposite to the upper iron core 121 and located on the side of the upper iron core 121 facing away from the yoke plate 11. The lower iron core 122 is movable relative to the yoke plate 11 in a direction closer to or 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 is slidably engaged with the upper iron core 121 and is fixed relative to the lower iron core 122. When the coil is energized, it can magnetize the upper iron core 121 and the lower iron core 122, causing the upper iron core 121 and the lower iron core 122 to attract each other and drive the lower iron core 122 to move closer to the upper iron core 121, thereby driving the push rod 1332 to drive the entire moving assembly 13 to move closer to the stationary contact 141.

[0047] Referring to Figures 2, 4, and 5, in some embodiments, the moving assembly 13 further includes a bracket 135. The bracket 135 may include two first arms 1351, which are located on opposite sides of the moving spring mechanism 131 in the direction of movement relative to the pushing mechanism 133, and are directly or indirectly connected to the pushing seat 1331. The two first arms 1351 slide against the moving spring mechanism 131 on opposite sides to limit the movement of the moving spring mechanism 131 relative to the pushing seat 1331 in the direction of approaching or moving away from the stationary contact 141. When the moving spring mechanism 131 and the pushing seat 1331 are relatively close, the moving spring mechanism 131 and the pushing seat 1331 can compress the elastic element 132, thereby causing the elastic element 132 to undergo elastic deformation. The sliding limitation of the moving spring mechanism 131 by the two first arms 1351 can guide the movement of the moving spring mechanism 131 relative to the pushing seat 1331, improving the performance stability of the high-voltage DC relay 10.

[0048] 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 the side of the moving spring mechanism 131 facing away from the push mechanism 133 and located between the moving spring mechanism 131 and the insulating cover 142. The second arm 1352 can limit the extreme position of the moving spring mechanism 131 away from the push seat 1331 on the side of the moving spring mechanism 131 facing the stationary contact 141, preventing the moving spring mechanism 131 from disengaging from the elastic element 132 and the push seat 1331, thereby improving the performance stability of the high-voltage DC relay 10.

[0049] In some embodiments, the moving spring mechanism 131 includes a moving spring 1311 and a lower armature 1314 fixedly connected to the moving spring 1311. The high-voltage DC relay 10 also includes an upper armature 143 opposite to the lower armature 1314. The moving contact 1313 is located on the side of the moving spring 1311 facing the stationary contact 14. The upper armature 143 and the lower armature 1314 together form a short-circuit protection ring structure. The upper armature 143 is located on the side of the lower armature 1314 facing away from the push seat 1331. In the embodiment shown in FIG2, the upper armature 143 is located outside the moving assembly 13 and fixed relative to the stationary contact 14. For example, the upper armature 143 may be located on the insulating cover 142. The upper armature 143 is located corresponding to the stationary contact 141 and is located between the insulating cover 142 and the second arm 1352. Alternatively, the bracket 135 may not have the second arm 1352. In this case, the upper armature 143 is located between the insulating cover 142 and the moving spring 1311. When the bracket 135 does not have the second arm 1352, the upper armature 143 can limit the moving spring mechanism 131 on the side facing away from the push seat 1331, limiting the moving spring mechanism 131 to its extreme position away from the push seat 1331. In some embodiments, the insulating cover 142 covers the moving component 13 and is located on the yoke plate 11. The stationary contact 14 and the upper armature 143 are both fixedly mounted on the insulating cover 142. The stationary contact 14 protrudes from the insulating cover 142 on the side facing away from the moving spring mechanism 131, i.e., the side facing away from the stationary contact 141. In other embodiments, when the bracket 135 has the second arm 1352, the upper armature 143 can also be fixed to the second arm 1352 and located between the second arm 1352 and the moving spring mechanism 131.

[0050] When the moving contact 1313 and the stationary contact 141 come into contact, the magnetic field generated by the moving reed 1311 and the stationary contact 14 can magnetize the upper armature 143 and the lower armature 1314, so that the upper armature 143 and the lower armature 1314 attract each other, which can provide a holding force for the contact between the moving contact 1313 and the stationary contact 141. This helps to reduce the holding force required by the electromagnetic component 12, and also helps to reduce the cost and size of the electromagnetic component 12.

[0051] Further, referring to Figures 2, 4, and 5, in some embodiments, the moving assembly 13 further includes a support element 136. The two ends of the support element 136 are respectively connected to two first arms 1351 to be fixed relative to the bracket 135. A portion of the support element 136 is positioned opposite and spaced apart from the moving spring mechanism 131. When the moving contact 1313 and the stationary contact 141 spring open under the action of a short-circuit current, causing the moving spring mechanism 131 to move away from the stationary contact 14, the support element 136 can abut against the moving spring mechanism 131 along the path of its movement towards the push seat 1331. It is understood that when the support element 136 abuts against the moving spring mechanism 131, the support element 136 can prevent the moving spring mechanism 131 and the push seat 1331 from continuing to move closer together. In some embodiments, the direction of movement of the moving spring mechanism 131 away from the stationary contact 14 is the same as the direction of movement towards the push seat 1331. It should be noted that the support element 136 can be opposite to one of the moving spring 1311 and the lower armature 1314 of the moving spring mechanism 131, so as to abut against one of the moving spring 1311 and the lower armature 1314 on the path of the moving spring mechanism 131 moving toward the push seat 1331. Alternatively, it can be opposite to both the moving spring 1311 and the lower armature 1314 at the same time, so as to abut against both the moving spring 1311 and the lower armature 1314 simultaneously, as long as it can achieve the supporting function for the moving spring mechanism 131.

[0052] It should be noted that in this application, the state in which the moving contact 1313 and the stationary contact 141 are spaced apart, and the electromagnetic component 12 does not apply force to the push rod 1332, i.e., the high-voltage DC relay 10 is disconnected from the circuit, is called the initial state. In the initial state, the support element 136 is spaced apart from the moving spring mechanism 131. When it is necessary to bring the moving contact 1313 and the stationary contact 141 into contact to conduct the circuit, the coil in the electromagnetic component 12 is energized, and the lower iron core 122 moves towards the upper iron core 121, which can drive the push rod 1332 to drive the push seat 1331, and then drive the moving spring mechanism 131 towards the stationary contact 141, so that the moving component 13 has a first state and a second state. Please refer to Figure 6. When the moving component 13 moves to the first state, the moving contact 1313 is just in contact with the stationary contact 141, and the high-voltage DC relay 10 conducts the circuit. In the first state, the length of the elastic element 132 is the same as the length in the initial state. In other words, during the process of the pushing mechanism 133 driving the moving spring mechanism 131 to move towards the stationary contact 141 to switch from the initial state to the first state, the moving spring mechanism 131, the bracket 135, the elastic element 132 and the pushing mechanism 133 move synchronously.

[0053] Please refer to Figure 7. After the electromagnetic component 12 drives the moving spring mechanism 131 to move to the first state via the pushing mechanism 133, the electromagnetic component 12 continues to drive the pushing mechanism 133 to move towards the stationary contact 141 to the second state. During the transition from the first state to the second state, since the moving contact 1313 is in contact with the stationary contact 141, the moving spring mechanism 131 and the stationary contact 141 are relatively fixed. As the pushing mechanism 133 continues to move towards the stationary contact 141, the distance between the pushing seat 1331 and the moving spring mechanism 131 decreases. That is, during the transition from the first state to the second state, the moving spring mechanism 131 and the pushing seat 1331 are relatively close. This relative closeness between the moving spring mechanism 131 and the pushing seat 1331 will compress the elastic element 132, causing the length of the elastic element 132 to decrease and the elastic element 132 to undergo elastic deformation. Understandably, in both the first and second states, the moving contact 1313 is in contact with the stationary contact 141. In the second state, the elastic element 132 applies an elastic force to the moving spring mechanism 131 to press the moving contact 1313 against the stationary contact 14, improving the stability and reliability of the contact between the moving contact 1313 and the stationary contact 141. Simultaneously, the elastic element 132, in conjunction with the electromagnetic assembly 12, can counteract at least part of the electrodynamic repulsion between the moving contact 1313 and the stationary contact 141, which helps reduce the holding force required by the high-voltage DC relay 10 for the electromagnetic assembly 12, and consequently reduces the cost and size of the electromagnetic assembly 12.

[0054] It is understandable that during the transition from the initial state to the first state, and during the transition from the first state to the second state, the lower iron core 122 gradually approaches the upper iron core 121. In the first state, the lower iron core 122 and the upper iron core 121 are spaced apart. In the second state, the lower iron core 122 can just make contact with the upper iron core 121, which is beneficial to enhance the magnetic attraction between the upper iron core 121 and the lower iron core 122 in the second state, thereby enhancing the holding force of the electromagnetic component 12 on the moving component 13.

[0055] In some embodiments, the position of the support element 136 is designed such that, in the second state, the support element 136 remains spaced apart from the moving spring mechanism 131, and the distance between the support element 136 and the moving spring mechanism 131 is smaller in the second state than in the first state. Furthermore, in the second state, the difference between the length of the elastic element 132 and its ultimate compression length is greater than the distance between the support element 136 and the moving spring mechanism 131. In some embodiments, the length of the elastic element 132 may be equal to the distance between the moving spring mechanism 131 and the push seat 1331.

[0056] Referring to Figure 8, it can be understood that when the circuit is short-circuited or overloaded (taking a current exceeding 8kA as an example in this application), the electrodynamic repulsion between the moving contact 1313 and the stationary contact 141 is greater than the elastic force exerted by the elastic element 132 on the moving spring mechanism 131. This causes the moving contact 1313 to spring apart from the stationary contact 141, causing the moving spring mechanism 131 to move towards the push seat 1331 and further compress the elastic element 132 until the support element 136 abuts against the moving spring mechanism 131. At this time, the support element 136 provides support for the moving spring mechanism 131, preventing the moving spring mechanism 131 from moving towards the push seat 1331 relative to it. In this application, the state in which the support element 136 abuts against the moving spring mechanism 131 to provide support for the moving spring mechanism 131 is referred to as the third state of the high voltage DC relay 10. In the third state, the moving spring mechanism 131, the bracket 135 and the push mechanism 133 are relatively fixed, and the electromagnetic component 12 bears the impact force of the moving spring mechanism 131.

[0057] When the circuit connected to the high-voltage DC relay 10 is short-circuited or overloaded, causing the moving contact 1313 of the moving spring mechanism 131 and the stationary contact 141 of the stationary contact 14 to spring open due to electric repulsion, the moving spring mechanism 131 can first compress the elastic element 132 until the support element 136 abuts against the moving spring mechanism 131 to prevent the moving spring mechanism 131 and the pushing mechanism 133 from continuing to get closer to each other. Since the electric repulsion between the moving contact 1313 and the stationary contact 141 disappears after the moving contact 1313 and the stationary contact 141 spring open, the elastic element 132 can effectively buffer the kinetic energy of the moving spring mechanism 131 during the process of the moving spring mechanism 131 moving away from the stationary contact 141 until the support element 136 abuts against the moving spring mechanism 131. Furthermore, due to the supporting effect of the support element 136 on the moving spring mechanism 131, the maximum spring-opening distance between the moving spring mechanism 131 and the stationary contact 141 can be shortened. This ensures that when the support element 136 abuts against the moving spring mechanism 131, the elastic element 132 will not be compressed to its limit compression length, and the impact of the moving spring mechanism 131 on the pushing mechanism 133 will not be too great. This avoids damage to the high-voltage DC relay 10 caused by the moving component 13 completely separating from the stationary contact 14 due to excessive impact.

[0058] Furthermore, the contact between the support element 136 and the moving spring mechanism 131 prevents the moving spring mechanism 131 from moving further away from the stationary contact 141, which helps to reduce the relative spring-off distance between the moving contact 1313 and the stationary contact 141. Combined with the buffering effect of the elastic element 132 to prevent the moving assembly 13 from detaching from the stationary contact 14, the distance between the moving contact 1313 and the stationary contact 141 is not too far. This helps to prevent excessive heat generated by arcing between the moving contact 1313 and the stationary contact 141, which could damage or even cause an explosion of the high-voltage DC relay 10. In addition, the buffering effect of the elastic element 132 on the moving spring mechanism 131 also reduces the holding force required by the moving assembly 13 on the electromagnetic assembly 12, allowing the electromagnetic assembly 12 to support the entire moving assembly 13 with a smaller holding force. This helps to reduce the number of coil turns and / or the volume of the iron core of the electromagnetic assembly 12, which is beneficial for the miniaturization design of the high-voltage DC relay 10. Furthermore, by setting support elements 136 on the two first arms 1351 to abut against the moving spring mechanism 131 on the movement path of the moving spring mechanism 131, the assembly of the support elements 136 is simple and the setting cost is low, which is conducive to simplifying the structure and manufacturing process of the moving component 13, and also conducive to the miniaturization and low cost realization of the high voltage DC relay 10.

[0059] Therefore, during the transition from the second state to the third state, the aforementioned high-voltage DC relay 10 first buffers the impact of the moving spring mechanism 131 through the elastic element 132, and then the electromagnetic component 12 bears the impact of the moving spring mechanism 131. This helps reduce the holding force required by the electromagnetic component 12, reduces its cost and size, and also reduces the spring-off distance between the moving contact 1313 and the stationary contact 141, thereby reducing the heat generated by the arcing phenomenon. The aforementioned high-voltage DC relay 10 achieves a balance between small size, low cost, and high resistance to short-circuit current and voltage. Based on this, the high-voltage DC relay 10 provided in this application can be used in circuits with high current, such as circuits with operating currents below 8kA. The high-voltage DC relay 10 includes, but is not limited to, applications in battery pack circuits of new energy vehicles. The high-voltage DC relay 10 can also be used as a switching element in circuits of any other applicable equipment, which will not be elaborated upon in this application.

[0060] It is understood that in this application, the support element 136 only contacts the moving spring mechanism 131 in the third state to provide support for the moving spring mechanism 131. In other states, the support element 136 will not interfere with the relative movement of the moving spring mechanism 131 and the push seat 1331. This helps to avoid the setting of the support element 136 causing other types of interference to the movement of the moving spring mechanism 131, such as sliding fit or limit fit, which would increase the risk of the moving spring mechanism 131 getting stuck, uneven force, or wear and scraping. While providing support, it also helps to maintain the structural reliability of the moving assembly 13 and reduce the impact of the support element 136 on the contact reliability of the moving assembly 13.

[0061] In some embodiments, the elastic element 132 is disposed between the push seat 1331 and the moving spring mechanism 131, and its two ends abut against the moving spring mechanism 131 and the push seat 1331 respectively, for example, against the lower armature 1314 and the push seat 1331, or against the moving spring 1311 and the push seat 1331. The two ends of the elastic element 132 can be connected to the moving spring mechanism 131 and the push seat 1331 respectively. This arrangement can rationally plan the spatial layout between the moving spring mechanism 131, the elastic element 132 and the push mechanism 133, making the structure of the moving assembly 13 more compact, which is beneficial to improving the space utilization efficiency of the moving assembly 13. At the same time, it is also beneficial to keep the elastic element 132 relatively far away from the contact position of the moving contact 1313 and the stationary contact 141, reducing the impact of high temperature and ablation spatter on the elastic element 132, and reducing the assembly difficulty of the elastic element 132 with other components.

[0062] In some embodiments, the support element 136 is located between the moving spring mechanism 131 and the push seat 1331, and in the initial state, the support element 136 is spaced apart from both the moving spring mechanism 131 and the push seat 1331. The support element 136 may be a portion located between the two first arms 1351 for abutting and supporting the moving spring mechanism 131 in the third state. Thus, the support element 136 is farther from the contact position of the moving contact 1313 and the stationary contact 141, which helps to reduce the impact of high temperature and ablation spatter on the support element 136, for example, preventing the distance between the support element 136 and the moving spring mechanism 131 from being reduced due to spatter, thus affecting the transition from the second state to the third state.

[0063] The structure of the elastic element 132 is not limited, as long as it can provide support for the moving spring mechanism 131 in the third state. Referring again to Figures 4 and 5, in some embodiments, the support element 136 is a rod-shaped structure, with two first arms 1351 passing through and fixedly connected to both ends of the support element 136. Using a rod-shaped support can effectively reduce the manufacturing and assembly costs of the support element 136. Further, 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 has a base 1321 and two spring arms 1322, which are respectively connected to both ends of the base 1321. The base 1321 is fixedly mounted on the push seat 1331, and the support element 136 is located between the two spring arms 1322. It is understood that the end of the spring arm 1322 away from the base 1321 abuts against the moving spring mechanism 131. When the distance between the moving spring mechanism 131 and the push seat 1331 changes, it can drive the spring arm 1322 to undergo elastic deformation. Using a leaf spring as the elastic element 132, a space for accommodating the support element 136 can be 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 moving assembly 13. According to different elastic fit requirements, the elastic element 132 can be provided with multiple bases 1321. Each base 1321 can be provided with two spring arms 1322 at both ends. Two adjacent bases 1321 are arranged side by side on the push seat 1331. The two adjacent bases 1321 can be connected to each other or be an integral structure to improve the structural reliability of the elastic element 132. In the embodiment shown in Figure 5, the elastic element 132 is provided with two bases 1321 as an example.

[0064] Furthermore, in some embodiments, the two ends of the movable spring 1311 protrude from the lower armature 1314, and the two spring arms 1322 respectively abut against the two ends of the movable spring 1311 protruding from the lower armature 1314, with the support element 136 opposite to the lower armature 1314. This allows for a reasonable configuration of the structural and positional relationships between the movable spring 1311, the lower armature 1314, the support element 136, and the elastic element 132, improving space utilization efficiency while avoiding mutual interference between components, and enhancing the structural and performance stability of the moving assembly 13.

[0065] Please refer to Figures 9 and 10, which provide another configuration of the support element 136. In some embodiments, the support element 136 is a sheet-like structure, comprising a sheet-like body 1323 and two protrusions 1324, which are respectively connected to opposite edges of the sheet-like body 1323. The sheet-like body 1323 is located between the two first arms 1351 and abuts against the lower armature 1314 to support the moving spring mechanism 131. The two protrusions 1324 are respectively embedded in the two first arms 1351 and fixedly connected to them. By using the sheet-like body 1323 to support the moving spring mechanism 131, the contact area between the support element 136 and the moving spring mechanism 131 is increased, thereby improving the stability of the moving spring mechanism 131 relative to the elastic element 132 and the push seat 1331 in the third state, making the moving spring mechanism 131 less prone to swaying.

[0066] In some embodiments, the sheet-like body 1323 is provided with a through hole, and the elastic element 132 is a helical spring, which passes through the through hole into the sheet-like body 1323. In this way, the structural and positional relationship between the support element 136 and the elastic element 132 can be rationally planned, the spatial layout of the moving assembly 13 can be optimized, the space utilization efficiency can be improved, and mutual interference between the components can be avoided.

[0067] In some embodiments, the push seat 1331 has a recessed receiving groove 1333 on the side facing the moving spring mechanism 131. The receiving groove 1333 is opposite to 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 against the sheet-like body 1323 within the receiving groove 1333. In this way, without affecting the supporting effect of the support element 136 on the moving spring mechanism 131, the structural compactness of the moving assembly 13 can be improved, and the space utilization efficiency can be increased.

[0068] In this application, the sliding engagement between the first arm 1351 and the moving spring mechanism 131 can be described as follows: the opposing sides of the lower armature 1314 can be in sliding engagement with the surfaces opposite to the two first arms 1351; the opposing sides of the moving spring 1311 can be in sliding engagement with the two first arms 1351; or a portion of the moving spring 1311 or the lower armature 1314 can be inserted into and slidably disposed on the first arm 1351, as long as the first arm 1351 can provide guidance and limiting function for the movement of the moving spring mechanism 131 relative to the push seat 1331. In some embodiments, the first arm 1351 of the bracket 135 can be directly connected to the push seat 1331, for example, by insert injection molding and integrally formed with the push seat 1331, or the first arm 1351 and the push seat 1331 can have an insertion relationship. The moving component 13 can also include a fixing piece connected to the first arm 1351 and the push seat 1331, through which the bracket 135 is indirectly connected to the push seat 1331.

[0069] In the embodiments shown in Figures 9 and 10, the movable spring 1311 is an integral spring structure. Referring to Figures 4 and 5, in some embodiments, the movable spring 1311 may also include two sub-springs 1312 arranged side by side and spaced apart from each other. The lower armature 1314 may be connected to both sub-springs 1312 simultaneously. The lower armature 1314 may also include two spaced-apart sub-armatures (not shown in the figures), with each sub-armature corresponding to one of 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. With this arrangement, the two sub-springs 1312 can provide more stable electrical contact, reduce poor contact caused by wear or damage to a single spring, share the mechanical load of the movable contact 1313, reduce the stress of a single spring, improve the durability of the high-voltage DC relay 10, provide a more uniform current distribution, reduce arcing and contact resistance, and improve electrical contact performance. Furthermore, when one of the sub-springs 1312 fails, the other sub-spring 1312 can still achieve on / off control of the circuit with the stationary contact 141, thereby improving the performance reliability of the high-voltage DC relay 10.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high-voltage DC relay, comprising: The stationary contact is equipped with a stationary contact point; as well as, The moving component includes a moving spring mechanism, a pushing mechanism, an elastic element, a bracket, and a supporting element. The moving spring mechanism has a moving contact opposite to the stationary contact. The moving spring mechanism is elastically engaged with the pushing mechanism through the elastic element. The bracket includes two first arms, which are located on opposite sides of the moving spring mechanism in the direction of movement relative to the pushing mechanism. The first arms are connected to the pushing mechanism and are slidably engaged with the moving 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 moving spring mechanism and spaced apart. When the moving contact and the stationary contact spring apart under the action of a short-circuit current, the supporting element is used to abut against the moving spring mechanism on the path in which the moving spring mechanism moves toward the pushing mechanism.

2. The high-voltage DC relay according to claim 1, wherein, The elastic element is located between the moving spring mechanism and the pushing mechanism, and its two ends abut against the moving spring mechanism and the pushing mechanism, respectively.

3. The high-voltage DC relay according to claim 1, wherein, The support element is located between the moving spring mechanism and the pushing mechanism.

4. The high-voltage DC relay according to claim 1, wherein, The elastic element includes a leaf spring, which has a base and two spring arms. The two spring arms are respectively connected to the two ends of the base. The base is fixedly mounted on the pushing mechanism, and the support element is located between the two spring arms.

5. The high-voltage DC relay according to claim 4, wherein, The support element is a rod-shaped structure, with its two ends respectively passing through the two first arms.

6. The high-voltage DC relay according to claim 4, wherein, The moving spring mechanism includes a moving spring and a lower armature. The moving contact is located on the side of the moving spring facing the stationary contact. The lower armature is fixedly connected to the moving spring. Both ends of the moving spring protrude from the lower armature. The two spring arms respectively abut against the two ends of the moving spring protruding from the lower armature. The support element is opposite to the lower armature.

7. The high-voltage DC relay according to claim 1, wherein, The support element is a sheet-like structure, comprising 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.

8. The high-voltage DC relay according to claim 7, wherein, The sheet-like body has a through hole, and the elastic element includes a helical spring, which passes through the through hole into the sheet-like body.

9. The high-voltage DC relay according to claim 7, characterized in that, The push seat of the push mechanism is recessed with a receiving groove on the side facing the moving spring mechanism. The receiving groove is provided corresponding to the sheet-like main body, and at least a portion of the sheet-like main body is received in the receiving groove.

10. The high-voltage DC relay according to claim 1, wherein, The moving spring mechanism includes a moving spring and a lower armature. The moving contact is located on the side of the moving spring facing the stationary contact. The lower armature is fixedly connected to the moving spring. The support element is opposite to either the lower armature or the moving spring.

11. The high-voltage DC relay according to claim 10, wherein, The high-voltage DC relay also includes an upper armature opposite to the lower armature. When the moving contact and the stationary contact are opposite each other, the upper armature and the lower armature can be magnetized and attract each other. The upper armature is located outside the moving component and is fixed relative to the stationary contact.

12. The high-voltage DC relay according to claim 10, wherein, The high-voltage DC relay also includes an upper armature opposite to the lower armature. When the moving contact and the stationary contact are opposite each other, the upper armature and the lower armature can be magnetized and attract each other. The bracket also includes a second arm connected to the two first arms. The second arm is located on the side of the moving spring mechanism facing away from the pushing mechanism, and the upper armature is fixed to the second arm.

13. The high-voltage DC relay according to any one of claims 1-10, wherein, The pushing mechanism can drive the moving spring mechanism to move towards the stationary contact, so that the high-voltage DC relay has a first state and a second state. In the first state, the moving contact is exactly in contact with the stationary contact. In the second state, the moving contact is pressed against the stationary contact by the elastic element. During the switching process from the first state to the second state, the pushing mechanism moves relative to the moving spring mechanism towards the stationary contact. The distance between the support element and the moving spring mechanism is smaller in the second state than in the first state.

14. The high-voltage DC relay according to claim 13, wherein, In the second state, the difference between the dimension of the elastic element in the direction of motion of the moving spring mechanism relative to the pushing mechanism and the ultimate compression length of the elastic element is greater than the distance between the support element and the moving spring mechanism.

15. The high-voltage DC relay according to claim 13, wherein, The moving spring mechanism can spring away from the stationary contact under the electric repulsive force generated by the short-circuit current, so that the high-voltage DC relay switches from the second state to the third state. In the third state, the support element abuts against the moving spring mechanism to prevent the moving spring mechanism and the pushing mechanism from getting close to each other. The length of the elastic element is greater than the limit compression length of the elastic element.

16. The high-voltage DC relay according to any one of claims 1-10, wherein, The high-voltage DC relay also includes an electromagnetic component. The pushing mechanism includes a pushing seat and a pushing rod connected to the side of the pushing seat facing away from the moving spring mechanism. The moving spring mechanism is elastically engaged with the pushing seat through the elastic element. The pushing rod is inserted into the electromagnetic component. The electromagnetic component can drive the pushing seat to move towards or away from the stationary contact through the pushing rod.

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