Relay

Abstract

A relay includes a housing, a valve assembly, and a guard ring. The shell wall of the shell is provided with a pressure relief hole, and the pressure relief hole penetrates through the inner wall face and the outer wall face of the shell wall. The valve assembly is arranged on the shell and comprises a valve block, and the valve block is configured to be broken to open the pressure relief hole when the gas pressure in the shell is larger than or equal to a threshold value. The protection ring is fixedly arranged relative to the shell, and a protection cavity communicated with the pressure relief hole is defined by the protection ring; all the valve plates are located in the protection cavity.

Description

Technical Field

[0001] This application relates to the field of electrical control device technology, and more specifically, to a relay. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] As the driving range of new energy vehicles continues to increase, battery capacity also increases, thus placing higher demands on the short-circuit current and voltage resistance of relays. When the short-circuit load is large, the moving and stationary contacts of a high-voltage DC relay may spring open due to the electrostatic repulsion generated by the short-circuit current, resulting in contact arcing. Because the load short-circuit current and voltage are both very high, this causes a momentary and violent arc between the moving and stationary contacts, which can easily lead to the relay exploding. Utility Model Content

[0004] This application provides a relay to improve the problem of relays in related technologies being prone to explosion.

[0005] The relay in this application embodiment includes:

[0006] A housing, wherein the housing wall has a pressure relief hole that penetrates the inner and outer wall surfaces of the housing wall;

[0007] A valve assembly, disposed on the housing, includes a valve disc configured to rupture and open the pressure relief port when the gas pressure within the housing is greater than or equal to a threshold.

[0008] A protective ring is fixedly disposed relative to the housing, and the protective ring forms a protective cavity that communicates with the pressure relief hole; wherein all of the valve plates are located within the protective cavity.

[0009] According to some embodiments of this application, the housing has a first positioning structure, the protective ring has a second positioning structure, and the first positioning structure and the second positioning structure are positioned in conjunction.

[0010] According to some embodiments of this application, one of the first positioning structure and the second positioning structure is a positioning protrusion and the other is a positioning hole, with the positioning protrusion passing through the positioning hole.

[0011] According to some embodiments of this application, the protective ring includes a ring body and a plurality of lugs. The ring body forms the protective cavity. The plurality of lugs protrude from the outer peripheral side of the ring body and are arranged along the circumference of the ring body. Each lug fits against the shell wall of the housing and has the positioning hole. The shell wall of the housing is provided with the positioning protrusion at the position corresponding to the lug.

[0012] According to some embodiments of this application, the valve assembly further includes a connecting ring, at least a portion of which is located within the protective cavity;

[0013] The two axial ends of the connecting ring are respectively connected to the housing and the valve plate. The two axial ends of the connecting ring have a first opening and a second opening. The first opening communicates with the pressure relief hole, and the valve plate covers the second opening.

[0014] According to some embodiments of this application, the connecting ring includes a first annular segment and a second annular segment connected to each other. The first annular segment and the second annular segment are arranged along the axial direction of the connecting ring. The end of the first annular segment away from the second annular segment has the first opening. The second annular segment gradually contracts inward from the first annular segment to form an annular structure with a gradually decreasing inner diameter. The end of the second annular segment away from the first annular segment has the second opening.

[0015] According to some embodiments of this application, the shell wall of the housing has an annular groove, which surrounds the outer periphery of the pressure relief hole;

[0016] The edge of the first opening of the connecting ring is located within the annular groove, and the annular groove is also provided with solder, which is used to fix the connecting ring to the housing.

[0017] According to some embodiments of this application, the shell wall of the housing is further provided with a limiting protrusion on the side surface facing the connecting ring, and the limiting protrusion is located on the inner side of the connecting ring.

[0018] According to some embodiments of this application, the valve plate includes a valve body and a metallization layer, the metallization layer is attached to one side surface of the valve body in the thickness direction, and the metallization layer is connected to the connecting ring;

[0019] Wherein, the orthographic projection of the metallization layer on a target plane is the first projection, the orthographic projection of the valve body on the target plane is the second projection, and the first projection falls within the second projection; the target plane is perpendicular to the thickness direction of the valve plate.

[0020] According to some embodiments of this application, the valve plate is connected to the protective ring.

[0021] According to some embodiments of this application, the protection ring includes:

[0022] The third annular segment is connected to the housing, and the third annular segment forms the protective cavity with a third opening, which communicates with the pressure relief hole;

[0023] The fourth annular segment is connected to the end of the third annular segment away from the housing, and bends and extends from the third annular segment into the protective cavity to form a fourth opening; wherein the valve plate is connected to the fourth annular segment and covers the fourth opening.

[0024] According to some embodiments of this application, the fourth annular segment includes:

[0025] A vertical section, located inside the third annular section, has a fourth opening at one end, and the valve plate is connected to the vertical section; and

[0026] The bent section has one end connected to the other end of the vertical section, and the other end of the bent section is connected to the end of the third annular section away from the shell.

[0027] According to some embodiments of this application, the vertical segment and the third annular segment form a concentric ring structure.

[0028] According to some embodiments of this application, the valve plate is located between the pressure relief hole and the fourth annular segment.

[0029] According to some embodiments of this application, the valve assembly further includes a connecting ring, at least a portion of which is located within the protective cavity. One axial end of the connecting ring is welded to the housing, and the other end is welded to the side surface of the valve plate facing away from the fourth annular segment.

[0030] According to some embodiments of this application, the shell wall of the housing has an annular groove, which surrounds the outer periphery of the pressure relief hole;

[0031] The edge of the third opening of the third annular segment and the end of the connecting ring away from the valve plate are both located in the annular groove. Solder is also provided in the annular groove, which is used to fix the connecting ring, the protective ring and the housing together.

[0032] According to some embodiments of this application, the valve plate includes a valve body and two metallization layers. The two metallization layers are respectively attached to the two side surfaces of the valve body in the thickness direction, and the two metallization layers are respectively connected to the connecting ring and the fourth annular segment.

[0033] Wherein, the orthographic projection of the metallization layer on a target plane is the first projection, the orthographic projection of the valve body on the target plane is the second projection, and the first projection falls within the second projection; the target plane is perpendicular to the thickness direction of the valve plate.

[0034] According to some embodiments of this application, the protection ring includes:

[0035] The third annular segment forms the protective cavity with the third opening;

[0036] The fourth annular segment is connected to the end of the third annular segment away from the third opening, and bends and extends from the third annular segment into the protective cavity to form the fourth opening; wherein, the fourth annular segment is connected to the housing, the valve plate is connected to the fourth annular segment, and covers the fourth opening.

[0037] According to some embodiments of this application, the fourth annular segment includes:

[0038] A vertical section, located inside the third annular section, has a fourth opening at one end, and the valve plate is connected to the vertical section; and

[0039] A bent section, one end of which is connected to the other end of the vertical section, and the other end of which is connected to the end of the third annular section away from the third opening; wherein, the bent section is connected to the shell.

[0040] According to some embodiments of this application, the vertical segment and the third annular segment form a concentric ring structure.

[0041] According to some embodiments of this application, the valve plate includes a valve body and a metallization layer, the metallization layer is attached to one side surface of the valve body in the thickness direction, and the metallization layer is connected to the protective ring;

[0042] Wherein, the orthographic projection of the metallization layer on a target plane is the first projection, the orthographic projection of the valve body on the target plane is the second projection, and the first projection falls within the second projection; the target plane is perpendicular to the thickness direction of the valve plate.

[0043] According to some embodiments of this application, the valve plate covers the pressure relief hole.

[0044] According to some embodiments of this application, the protective ring surrounds the outer periphery of the valve plate.

[0045] According to some embodiments of this application, the valve assembly protrudes from the inner or outer wall surface of the housing.

[0046] According to some embodiments of this application, the relay further includes a moving contact and a stationary contact, the moving contact and the stationary contact being located within the housing, the stationary contact being fixedly disposed relative to the housing, and the moving contact being used to contact or separate from the stationary contact.

[0047] According to some embodiments of this application, the structural strength of the valve plate is less than the structural strength of the housing.

[0048] According to some embodiments of this application, the valve plate and the housing are made of different materials; and / or, the thickness of the valve plate is different from the thickness of the shell wall of the housing.

[0049] According to some embodiments of this application, the housing includes an insulating cover and a yoke plate. The insulating cover is disposed on one side surface of the yoke plate in the thickness direction. The pressure relief hole penetrates the yoke plate along the thickness direction and is covered by the insulating cover. The protective ring is located on one side of the yoke plate in the thickness direction and is connected to the yoke plate.

[0050] According to some embodiments of this application, the relay further includes a housing, the housing being disposed within the housing; the housing has one or more vent holes, the vent holes penetrating the inner wall surface and the outer wall surface of the housing.

[0051] According to some embodiments of this application, the housing is further provided with a shielding member, which shields at least a portion of the vent hole, and the shielding member and the inner wall surface of the housing wall form an venting channel communicating with the vent hole.

[0052] An embodiment of the above application has at least the following advantages or beneficial effects:

[0053] The relay in this embodiment, on the one hand, by setting valve plates to release overpressure gas, ensures that the relay will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the housing under abnormal operating conditions such as short circuit and overload disconnection, thereby increasing the reliability of the product; on the other hand, the relay also includes a protective ring, which is fixedly set relative to the housing, and all the valve plates are located in the protective cavity formed by the protective ring. During the flow of components, since all the valve plates are located in the protective cavity of the protective ring, the protective ring plays a role in protecting the valve plates and preventing the valve plates from breaking due to collisions with other components; furthermore, the protective ring is a ring structure and does not cover the valve plates. When the valve plates break due to the impact of high temperature gas, the protective ring will not affect the timely release of gas inside the housing through the pressure relief hole.

[0054] Furthermore, the yoke plate has a limiting protrusion on the side facing the connecting ring, located inside the connecting ring. After the connecting ring is installed on the housing, the limiting protrusion prevents the connecting ring from undergoing large displacement relative to the housing, ensuring welding reliability.

[0055] Furthermore, the second annular segment of the connecting ring is an inwardly recessed annular structure. When the second annular segment is fixed to the valve plate by welding, the inwardly recessed structure of the second annular segment improves the flexibility of the entire connecting ring, which can further absorb the stress generated during the welding process and prevent the valve plate from cracking due to stress.

[0056] Furthermore, the metallization layer does not cover the entire surface of one side of the valve body, but is designed to leave a blank space at the edge of the valve body. This reduces the stress when the valve plate is welded and fixed to the connecting ring, and lowers the risk of the valve plate breaking.

[0057] Furthermore, the valve plate is connected to the protective ring. The protective ring not only protects the valve plate but also serves to mount it. In other words, one protective ring achieves two functions, eliminating the need for additional components to connect the valve plate and saving material costs.

[0058] Furthermore, the connecting ring and the fourth annular segment are welded to the two sides of the valve plate in the thickness direction, respectively. In this way, the welding attraction on both sides of the valve plate cancels each other out during the welding process, thereby preventing the valve plate from cracking due to welding stress.

[0059] Furthermore, by incorporating a shielding component within the housing to block the vent, and creating a venting channel between the shielding component and the housing wall that communicates with the vent, when gas breaks through the valve plate and begins to release, the gas first impacts the shielding component and then flows through the venting channel to the vent. This design prevents gas pressure from directly acting on the area around the vent, thereby reducing the risk of cracking in the structure surrounding the vent. Additionally, since the shielding component blocks at least a portion of the vent, the internal structure of the relay is not directly visible when viewed through the vent from the outside of the housing, improving aesthetics. Attached Figure Description

[0060] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0061] Figure 1 The diagram shown is a three-dimensional representation of a relay.

[0062] Figure 2 The diagram shows along Figure 1 A sectional view obtained by cutting along section line AA.

[0063] Figure 3 The diagram shows a three-dimensional view of the moving component, valve assembly, and protective ring assembled on the yoke plate.

[0064] Figure 4 The diagram shown is a side view of the moving assembly, valve assembly, and protective ring assembled on the yoke plate.

[0065] Figure 5 The diagram shows a three-dimensional view of the valve assembly and protective ring assembled on the yoke plate.

[0066] Figure 6 What is shown is Figure 5 A schematic diagram of its breakdown.

[0067] Figure 7 The diagram shows along Figure 5 A partial sectional view obtained by cutting along the BB section line.

[0068] Figure 8 The diagram shown is a three-dimensional representation of the yoke plate.

[0069] Figure 9 The diagram shown is a three-dimensional representation of the protective ring.

[0070] Figure 10 The diagram shown is a three-dimensional representation of the connecting ring.

[0071] Figure 11 The diagram shows along Figure 10 A sectional view obtained by cutting along the CC section line.

[0072] Figure 12 What is shown is Figure 6 A side view of the valve plate.

[0073] Figure 13 The diagram shown is a cross-sectional view of the yoke plate, valve plate, and protective ring assembled in the second embodiment.

[0074] Figure 14 The diagram shown is a cross-sectional view of the yoke plate, valve plate, and protective ring assembled in the third embodiment.

[0075] Figure 15 The figure shown is a cross-sectional view of the yoke plate, valve plate, connecting ring and protective ring assembled in the fourth embodiment.

[0076] Figure 16 What is shown is Figure 15 A side view of the valve plate.

[0077] Figure 17The diagram shown is a perspective view of a relay according to an embodiment of this application, and the relay includes a housing.

[0078] Figure 18 The diagram shown is a perspective view of a relay according to an embodiment of this application, and the relay includes a housing.

[0079] Figure 19 The diagram shows along Figure 17 A sectional view obtained by cutting along the DD section line. Detailed Implementation

[0080] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0081] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0082] like Figure 1 and Figure 2 As shown, the relay of this embodiment includes a housing 10, a pair of stationary contacts 20, a moving assembly 30, and a magnetic circuit portion 40. The pair of stationary contacts 20 are mounted on the housing 10 and are respectively used to connect to the positive and negative terminals of the load. The moving assembly 30 is movably disposed within the housing 10 and is used to switch the relay from a closed state to an open state and from an open state to a closed state. When the relay is in the closed state, the moving assembly 30 is in contact with the pair of stationary contacts 20; when the relay is in the open state, the moving assembly 30 is disconnected from the pair of stationary contacts 20. The magnetic circuit portion 40 is configured to drive the moving assembly 30 to move in response to an input signal, thereby switching the relay between the closed and open states.

[0083] like Figure 17 and Figure 18As shown, the relay also includes a housing 70, within which a housing 10, a pair of stationary contacts 20, a moving assembly 30, and a magnetic circuit portion 40 are disposed. As an example, the housing 70 may include a first housing 71 and a second housing 72 connected to form a cavity. The shape of the first housing 71 and the second housing 72 connected together can be a cuboid, a cylinder, etc., and this application does not limit this.

[0084] In one embodiment, both the first shell 71 and the second shell 72 are rectangular parallelepipeds and each has an opening on one side. The opening of the first shell 71 is opposite to the opening of the second shell 72, and the first shell 71 and the second shell 72 are fastened together to form a cavity.

[0085] Of course, in other embodiments, the first shell 71 can be a flat plate structure, and the second shell 72 can be a cuboid shape with an opening. The first shell 71 and the second shell 72 are fastened together to form a cavity.

[0086] like Figure 2 As shown, the housing 10 includes an insulating cover 11, a yoke plate 12, and a metal cover 13. The insulating cover 11 covers one side of the yoke plate 12 along its thickness direction, and the metal cover 13 covers the other side of the yoke plate 12 along its thickness direction. The insulating cover 11 and the yoke plate 12 form a first chamber 101, and the metal cover 13 and the yoke plate 12 form a second chamber 102. The yoke plate 12 has a first through hole 121, which penetrates the yoke plate 12 along its thickness direction, and the first chamber 101 and the second chamber 102 communicate through the first through hole 121.

[0087] In one embodiment, the insulating cover 11 may include a ceramic cover 111 and a frame plate 112. The ceramic cover 111 is made of ceramic material and is connected to the yoke plate 12 via the frame plate 112. The frame plate 112 may be a ring-shaped metal component, for example, made of an iron-nickel alloy. One end of the frame plate 112 is connected to the opening edge of the ceramic cover 111, for example, by laser welding, brazing, resistance welding, or adhesive bonding. The other end of the frame plate 112 is connected to the yoke plate 12, for example, by laser welding, brazing, resistance welding, or adhesive bonding.

[0088] The top wall of the ceramic cover 111 has two openings 111a, and a pair of stationary contacts 20 are respectively inserted into the two openings 111a. Each stationary contact 20 can be connected to the ceramic cover 111 by welding, but is not limited to this method.

[0089] Please continue reading. Figure 2The moving assembly 30 includes a moving contact 31, a first elastic element 32, and a push rod member 33. The moving contact 31 is used to contact or separate from a pair of stationary contacts 20; wherein, when the relay is in the closed state, the moving contact 31 is in contact with a pair of stationary contacts 20; when the relay is in the open state, the moving contact 31 is separated from a pair of stationary contacts 20. The push rod member 33 is used to drive the moving contact 31 to move.

[0090] The moving contact 31 has moving contacts at both ends along its length, and the stationary contact 20 has stationary contacts. Both the moving contacts and the stationary contacts are located inside the housing 10. The moving contacts are used to contact or separate from the stationary contacts.

[0091] The push rod member 33 is movably inserted through the first through hole 121 of the yoke plate 12, and part of the push rod member 33 extends out of the surface of the yoke plate 12 facing the stationary contact 20, and part of the push rod member 33 extends out of the surface of the yoke plate 12 away from the stationary contact 20.

[0092] The movable contact 31 is movably mounted on the push rod member 33. The first elastic member 32 is connected to the push rod member 33 and the movable contact 31, and is used to apply an elastic force to the movable contact 31 in the direction of the stationary contact 20 to provide contact pressure.

[0093] As an example, the first elastic element 32 is a spring or a leaf spring, but is not limited thereto. In addition, the number of the first elastic elements 32 can be one or more. When the number of the first elastic elements 32 is multiple, all of the multiple first elastic elements 32 can be springs, or all of them can be leaf springs, or they can be a combination of leaf springs and springs. This application does not make any special limitation in this regard.

[0094] Please continue reading. Figure 2 The magnetic circuit section 40 includes a moving iron core 41, a stationary iron core 42, a coil frame 43, and a coil winding 44. The coil frame 43 is a hollow cylindrical shape and is made of insulating material. The coil frame 43 is located on the side of the yoke plate 12 facing away from the stationary contact 20 and surrounds the outer periphery of the metal cover 13. The coil winding 44 is wound around the outer periphery of the coil frame 43.

[0095] The stationary iron core 42 is fixedly disposed within the metal cover 13, with a portion of the stationary iron core 42 inserted into the first through hole 121. The stationary iron core 42 has a second through hole 421, which corresponds in position to the first through hole 121, allowing the push rod member 33 to be movably inserted into both the first and second through holes 121. The moving iron core 41 is movably disposed within the metal cover 13 and is positioned opposite the stationary iron core 42 in the thickness direction of the yoke plate 12. The moving iron core 41 is connected to the push rod member 33 and is attracted by the stationary iron core 42 when the coil winding 44 is energized. The moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding, or other methods.

[0096] like Figure 2As shown, the magnetic circuit section 40 also includes a second elastic element 46, which is located inside the metal cover 13 and is disposed between the stationary iron core 42 and the moving iron core 41. When the coil winding 44 is de-energized, the second elastic element 46 can provide elastic force to the moving iron core 41 so that the moving iron core 41 can be reset.

[0097] In one embodiment, the second elastic element 46 is a spring and is sleeved on the outer periphery of the push rod member 33, but is not limited thereto.

[0098] It should be noted that when the coil winding 44 is energized, the stationary iron core 42 attracts the moving iron core 41 to move upward, and the moving iron core 41 can drive the push rod component 33 to move upward. When the moving contact 31 contacts the stationary contact 20, the moving contact 31 is stopped by the stationary contact 20, while the push rod component 33 will continue to move upward until it has completed its overtravel.

[0099] During the overtravel process, the first elastic element 32, after being squeezed by the push rod member 33, can provide elastic force to the moving contact piece 31 to provide contact pressure.

[0100] like Figures 3 to 7 As shown, the housing 10 has a pressure relief hole 122 in its shell wall, which penetrates both the inner and outer wall surfaces. The relay also includes a valve assembly 50 and a protective ring 60. The valve assembly 50 protrudes from the inner or outer surface of the housing 10 and is used to close or open the pressure relief hole 122. The valve assembly 50 is disposed on the housing 10 and includes a valve plate 51 that covers the pressure relief hole 122. The structural strength of the valve plate 51 is less than the structural strength of the housing 10, and the valve plate 51 is configured to rupture and open the pressure relief hole 122 when the gas pressure inside the housing 10 is greater than or equal to a threshold value. The protective ring 60 is connected to the housing 10 and forms a protective cavity 61 communicating with the pressure relief hole 122; all of the valve plates 51 are located within the protective cavity 61.

[0101] In one embodiment, a protective ring 60 surrounds the outer periphery of the valve plate 51.

[0102] Understandably, when the relay is in normal operating condition, the gas pressure inside the housing 10 is less than the threshold value. At this time, the valve plate 51 is not ruptured by the gas pressure inside the housing 10, and the valve assembly 50 remains closed to the pressure relief port 122. When the relay is in abnormal operating condition, the gas pressure inside the housing 10 is greater than or equal to the threshold value. At this time, the valve plate 51 is ruptured by the gas pressure inside the housing 10, and the gas pressure inside the housing 10 can be released through the pressure relief port 122.

[0103] In other words, under abnormal operating conditions, as the gas pressure inside the housing 10 gradually increases, the gas pressure will first break through the valve plate 51, causing the rapidly rising gas pressure to be released through the pressure relief hole 122. This prevents the gas pressure inside the housing 10 from continuing to rise and thus avoids reaching the structural strength of the housing 10, preventing an explosion. Under normal operating conditions, the gas pressure inside the housing 10 will not break through the valve plate 51, and the valve assembly 50 can still seal the pressure relief hole 122.

[0104] It is understandable that the term "normal operating condition" refers to the relay operating at its rated current, while the term "abnormal operating condition" refers to the moment when the moving contact 31 and the stationary contact 20 are subjected to a high-current short circuit, or an overload trip, etc. Furthermore, the pressure represented by the term "threshold" is slightly greater than the gas pressure inside the housing 10 when the relay is operating normally. The threshold value may be adjusted depending on the relay model, but it cannot exceed the structural strength of the housing 10.

[0105] In other words, when the relay is in normal working condition, the pressure inside the housing 10 will not reach this threshold, and the valve plate 51 will not be ruptured. When the relay is in abnormal working condition, the pressure inside the housing 10 is greater than or equal to this threshold, and the valve plate 51 can be ruptured by the gas.

[0106] Understandably, when valve assembly 50 closes pressure relief port 122, it can maintain the sealing of housing 10 and ensure the normal operation of relay.

[0107] In one embodiment, the design where the structural strength of the valve plate 51 is less than that of the housing 10 can be achieved through different materials and / or structures. For example, when the materials of the valve plate 51 and the cavity wall of the housing 10 are the same, the thickness of the valve plate 51 can be designed to be thinner and less than the thickness of the cavity wall of the housing 10, so that the gradually increasing temperature gas can preferentially break through the valve plate 51. Of course, when the thickness of the valve plate 51 and the cavity wall of the housing 10 are the same, the valve plate 51 can be made of ceramic, while the housing 10 can be made of metal, which will also allow the valve plate 51 to be broken through first. Alternatively, the valve plate 51 can be thinner and made of ceramic, while the cavity wall of the housing 10 can be thicker and made of metal. Of course, other suitable methods can also be used to make the structural strength of the valve plate 51 less than that of the housing 10, which will not be listed here.

[0108] The relay in this embodiment, on the one hand, by setting valve plates 51 to release overpressure gas, ensures that the relay will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the housing 10 under abnormal operating conditions such as short circuit and overload disconnection, thereby increasing the reliability of the product; on the other hand, the relay also includes a protective ring 60, which is fixedly set relative to the housing 10, and all the valve plates 51 are located in the protective cavity 61 enclosed by the protective ring 60. During the circulation of components, since all the valve plates 51 are located in the protective cavity 61 of the protective ring 60, the protective ring 60 plays a role in protecting the valve plates 51 and preventing the valve plates 51 from breaking due to collision with other components; furthermore, the protective ring 60 has a ring structure and does not cover the valve plates 51. When the valve plates 51 break due to the impact of high pressure gas, the protective ring 60 will not affect the timely release of gas inside the housing 10 through the pressure relief hole 122.

[0109] It should be noted that the number of pressure relief holes 122 can be one or more. When there is only one pressure relief hole 122, it can be located on any one of the ceramic cover 111, frame plate 112, yoke plate 12, and metal cover 13. When there are multiple pressure relief holes 122, they can be located on any one or more of the ceramic cover 111, frame plate 112, yoke plate 12, and metal cover 13. For example, when there are two pressure relief holes 122, both pressure relief holes 122 can be located on the yoke plate 12 simultaneously, or one pressure relief hole 122 can be located on the ceramic cover 111 and the other pressure relief hole 122 can be located on the yoke plate 12.

[0110] The following explanation will take the case of a single pressure relief hole 122 located on the yoke plate 12 as an example. Figure 6 and Figure 7 As shown, the pressure relief hole 122 penetrates the yoke plate 12 along the thickness direction and is covered by the insulating cover 11. The pressure relief hole 122 is connected to the first chamber 101.

[0111] It should be further noted that all valve plates 51 located in the protective cavity 61 can include the following two situations: First, such as... Figure 7 As shown, in one embodiment, a portion of the protective ring 60 extends from the side surface of the valve plate 51 facing away from the yoke plate 12; in another embodiment, the side surface of the protective ring 60 away from the yoke plate 12 is flush with the side surface of the valve plate 51 facing away from the yoke plate 12.

[0112] like Figure 3 and Figure 4 As shown, the protective ring 60 is located on one side of the yoke plate 12 in the thickness direction and is connected to the yoke plate 12. For example, the protective ring 60 is located on the side of the yoke plate 12 facing the ceramic cover 111; or, the protective ring 60 is located on the side of the yoke plate 12 away from the ceramic cover 111.

[0113] like Figure 5 , Figure 6 and Figure 9 As shown, the protective ring 60 includes a ring body 63 and multiple lugs 64. The ring body 63 forms a protective cavity 61. The multiple lugs 64 protrude from the outer peripheral side of the ring body 63 and are arranged circumferentially along the ring body 63. Each lug 64 is in contact with the yoke plate 12. The ring body 63 is a sleeve structure with openings at both ends. The orthographic projection of the ring body 63 on a target plane is a ring projection, and the orthographic projection of the pressure relief hole 122 on the target plane is located in the inner circle of the ring projection.

[0114] In one embodiment, the yoke plate 12 has a first positioning structure 123 and the lug 64 has a second positioning structure 62, with the first positioning structure 123 and the second positioning structure 62 being positioned and engaged.

[0115] In the embodiments of this application, when assembling the protective ring 60 and the housing 10, the protective ring 60 and the housing 10 can be pre-positioned by the first positioning structure 123 and the second positioning structure 62. When the protective ring 60 and the housing 10 are fixedly connected by welding, the welding reliability can be improved.

[0116] In one embodiment, one of the first positioning structure 123 and the second positioning structure 62 is a positioning protrusion 123a and the other is a positioning hole 62a, with the positioning protrusion 123a passing through the positioning hole 62a.

[0117] In the embodiments of this application, the yoke plate 12 has a positioning protrusion 123a on one side surface facing the insulating cover 11 and at the position corresponding to the lug 64, and the lug 64 of the protective ring 60 has a positioning hole 62a.

[0118] Of course, in other embodiments, the yoke plate 12 has a positioning hole 62a on the side surface facing the insulating cover 11, and the lug 64 of the protective ring 60 has a positioning protrusion 123a.

[0119] The positioning hole 62a can be a through hole or a blind hole, and this application does not make any special restrictions on it.

[0120] like Figure 6 and Figure 7 As shown, the valve assembly 50 also includes a connecting ring 52, at least a portion of which is located within the protective cavity 61. The two axial ends of the connecting ring 52 are connected to the housing 10 and the valve plate 51, respectively. The two axial ends of the connecting ring 52 have a first opening 52a and a second opening 52b. The first opening 52a communicates with the pressure relief hole 122, and the valve plate 51 seals the second opening 52b.

[0121] In one embodiment, the valve plate 51 and the connecting ring 52, the connecting ring 52 and the yoke plate 12, and the protective ring 60 and the yoke plate 12 can all be fixedly connected by welding.

[0122] like Figure 8 As shown, the yoke plate 12 has an annular groove 124 on the side surface facing the insulating cover 11, and the annular groove 124 surrounds the outer periphery of the pressure relief hole 122; the edge of the first opening 52a of the connecting ring 52 is located in the annular groove 124, and the annular groove 124 is also provided with solder (not shown in the figure), which is used to fix the connecting ring 52 to the housing 10.

[0123] In this embodiment of the application, the solder is disposed in the annular groove 124, which can prevent the solder from flowing freely during the heating process.

[0124] like Figure 7 and Figure 8 As shown, the yoke plate 12 is also provided with a limiting protrusion 125 on the side surface facing the connecting ring 52, and the limiting protrusion 125 is located inside the connecting ring 52.

[0125] In this embodiment of the application, after the connecting ring 52 is installed on the housing 10, the limiting protrusion 125 can prevent the connecting ring 52 from having a large displacement relative to the housing 10, thus ensuring welding reliability.

[0126] In one embodiment, the limiting protrusion 125 may be an annular structure, which may include a plurality of sub-protrusions arranged circumferentially along the pressure relief hole 122.

[0127] like Figure 10 and Figure 11 As shown, the connecting ring 52 includes a first annular segment 521 and a second annular segment 522 that are connected to each other. The first annular segment 521 and the second annular segment 522 are arranged along the axial direction of the connecting ring 52. The end of the first annular segment 521 away from the second annular segment 522 has a first opening 52a. The second annular segment 522 gradually contracts inward from the first annular segment 521 to form an annular structure with a gradually decreasing inner diameter. The end of the second annular segment 522 away from the first annular segment 521 has a second opening 52b.

[0128] In this embodiment of the application, the second annular segment 522 of the connecting ring 52 is an inwardly recessed annular structure. When the second annular segment 522 is fixed to the valve plate 51 by welding, the inwardly recessed structure of the second annular segment 522 improves the flexibility of the entire connecting ring 52, which can further absorb the stress generated during the welding process and prevent the valve plate 51 from cracking due to welding stress.

[0129] like Figure 12As shown, the valve plate 51 includes a valve body 511 and a metallization layer 512. The metallization layer 512 is attached to one side surface of the valve body 511 in the thickness direction and is connected to the connecting ring 52. The orthographic projection of the metallization layer 512 onto a target plane is the first projection, and the orthographic projection of the valve body 511 onto the target plane is the second projection. The first projection falls within the second projection. The target plane is perpendicular to the thickness direction of the valve plate 51.

[0130] In this embodiment, the metallization layer 512 does not cover the entire surface of one side of the valve body 511, but is designed to be blank at the edge of the valve body 511. This reduces the stress when the valve plate 51 is welded and fixed to the connecting ring 52, and reduces the risk of the valve plate 51 breaking.

[0131] In one embodiment, the valve body 511 is made of ceramic material, but is not limited thereto.

[0132] Of course, it should be noted that in other embodiments, the valve assembly 50 may not include the connecting ring 52, and the valve plate 51 may be directly fixedly connected to the housing 10, for example, the valve plate 51 may be welded to the yoke plate 12.

[0133] like Figure 19 As shown, the housing 70 has one or more vent holes 73, which penetrate the inner and outer walls of the housing 70. When the gas inside the housing 10 breaks through the valve plate 51 and is discharged from the housing 10 into the housing 70, the gas can be discharged to the outside of the housing 70 in a timely manner through the vent holes 73, thus avoiding a large amount of gas remaining inside the housing 70 and reducing the risk of the housing 70 cracking due to gas pressure.

[0134] In one embodiment, the first shell 71 and / or the second shell 72 are provided with vents 73.

[0135] Furthermore, the outer casing 70 is also provided with a shielding member 74, which can be connected to the first casing 71, the second casing 72, or both the first casing 71 and the second casing 72. The shielding member 74 blocks at least a portion of the vent 73, and the shielding member 74 and the inner wall surface of the casing 70 form an venting channel 75 communicating with the vent 73.

[0136] In this embodiment, a shielding member 74 is provided inside the outer casing 70 to block the vent 73, and a venting channel 75 communicating with the vent 73 is formed between the shielding member 74 and the casing wall of the outer casing 70. When gas breaks through the valve plate 51 and begins to release, the gas first impacts the shielding member 74, and then flows through the venting channel 75 to the vent 73. Figure 19(The dashed line indicates the airflow direction). This design prevents gas pressure from acting directly on the area around the vent 73, thereby reducing the risk of cracking in the structure around the vent 73 of the housing 70. Furthermore, the shield 74 blocks at least a portion of the vent 73, so the internal structure of the relay is not directly visible when viewed from the outside of the housing 70 through the vent 73, improving aesthetics.

[0137] like Figure 13 As shown, the similarities between the second embodiment and the first embodiment of this application will not be repeated here, but the differences are as follows:

[0138] The valve plate 51 is connected to the protective ring 60. In this embodiment, the protective ring 60 not only protects the valve plate 51 but also serves to mount it. In other words, the protective ring 60 performs two functions, eliminating the need for additional components to connect the valve plate 51 and saving material costs.

[0139] like Figure 13 As shown, the protective ring 60 includes a third annular segment 65 and a fourth annular segment 66. The third annular segment 65 is connected to the housing 10 and forms a protective cavity 61 with a third opening 61a, which communicates with the pressure relief hole 122. The fourth annular segment 66 is connected to the end of the third annular segment 65 away from the housing 10 and bends and extends from the third annular segment 65 into the protective cavity 61, forming a fourth opening 61b. The valve plate 51 is connected to the fourth annular segment 66 and seals the fourth opening 61b.

[0140] In one embodiment, the fourth annular segment 66 includes a vertical segment 661 and a bent segment 662. The vertical segment 661 is located inside the third annular segment 65 and forms a concentric ring structure with the third annular segment 65. One end of the vertical segment 661 has a fourth opening 61b, and the valve plate 51 is connected to the vertical segment 661. One end of the bent segment 662 is connected to the other end of the vertical segment 661, and the other end of the bent segment 662 is connected to the end of the third annular segment 65 away from the housing 10.

[0141] In one embodiment, the valve plate 51 is located between the pressure relief hole 122 and the fourth annular segment 66. That is, the valve plate 51 covers the end of the vertical segment 661 where the fourth opening 61b is provided.

[0142] like Figure 13 As shown, the yoke plate 12 has an annular groove 124 on the side surface facing the insulating cover 11, and the annular groove 124 surrounds the outer periphery of the pressure relief hole 122; the edge of the third opening 61a of the third annular segment 65 is located in the annular groove 124, and solder (not shown in the figure) is also provided in the annular groove 124, which is used to fix the protective ring 60 to the yoke plate 12.

[0143] In this embodiment of the application, the solder is disposed in the annular groove 124, which can prevent the solder from flowing freely during the heating process.

[0144] In one embodiment, the valve plate 51 includes a valve body 511 and a metallization layer 512. The metallization layer 512 is attached to one side surface of the valve body 511 in the thickness direction, and the metallization layer 512 is connected to the vertical segment 661 of the protective ring 60. The orthographic projection of the metallization layer 512 onto a target plane is a first projection, and the orthographic projection of the valve body 511 onto the target plane is a second projection. The first projection falls within the second projection. The target plane is perpendicular to the thickness direction of the valve plate 51.

[0145] like Figure 14 As shown, the similarities between the third embodiment and the second embodiment of this application will not be repeated here, but the differences are as follows:

[0146] The protective ring 60 includes a third annular segment 65 and a fourth annular segment 66. The third annular segment 65 forms a protective cavity 61 with a third opening 61a; the fourth annular segment 66 is connected to the end of the third annular segment 65 away from the third opening 61a, and extends from the third annular segment 65 into the protective cavity 61, forming a fourth opening 61b; wherein, the fourth annular segment 66 is connected to the housing 10, the valve plate 51 is connected to the fourth annular segment 66, and seals the fourth opening 61b.

[0147] The fourth annular segment 66 includes a vertical segment 661 and a bent segment 662. The vertical segment 661 is located inside the third annular segment 65 and forms a concentric ring structure with the third annular segment 65. One end of the vertical segment 661 has a fourth opening 61b, and the valve plate 51 is connected to the vertical segment 661. One end of the bent segment 662 is connected to the other end of the vertical segment 661, and the other end of the bent segment 662 is connected to the end of the third annular segment 65 away from the third opening 61a. The bent segment 662 is connected to the yoke plate 12 of the housing 10.

[0148] The yoke plate 12 has an annular groove 124 on the side facing the insulating cover 11. The annular groove 124 surrounds the outer periphery of the pressure relief hole 122. A portion of the bent section 662 is located inside the annular groove 124. Solder (not shown in the figure) is also provided inside the annular groove 124. The solder is used to fix the protective ring 60 to the yoke plate 12.

[0149] like Figure 15 As shown, the similarities between the fourth embodiment and the second embodiment of this application will not be repeated here, but the differences are as follows:

[0150] The valve assembly 50 also includes a connecting ring 52, at least part of which is located within the protective cavity 61. One axial end of the connecting ring 52 is welded to the housing 10, and the other end is welded to the side surface of the valve plate 51 facing away from the fourth annular segment 66.

[0151] In this embodiment of the application, the connecting ring 52 and the fourth annular segment 66 are respectively welded to the two sides of the valve plate 51 in the thickness direction. In this way, during the welding process, the welding attraction on both sides of the valve plate 51 cancels each other out, thereby preventing the valve plate 51 from cracking due to welding stress.

[0152] like Figure 15 As shown, the yoke plate 12 has an annular groove 124, which surrounds the outer periphery of the pressure relief hole 122; the edge of the third opening 61a of the third annular segment 65 and the end of the connecting ring 52 away from the valve plate 51 are both located in the annular groove 124. Solder is also provided in the annular groove 124, which is used to fix the connecting ring 52, the protective ring 60 and the housing 10 together.

[0153] like Figure 16 As shown, the valve plate 51 includes a valve body 511 and two metallization layers 512. The two metallization layers 512 are respectively attached to the two side surfaces of the valve body 511 in the thickness direction. The two metallization layers 512 are respectively connected to the connecting ring 52 and the fourth annular segment 66. The orthographic projection of the metallization layer 512 on a target plane is the first projection, and the orthographic projection of the valve body 511 on the target plane is the second projection. The first projection falls within the second projection. The target plane is perpendicular to the thickness direction of the valve plate 51.

[0154] In this embodiment, the metallization layer 512 on both sides of the valve body 511 does not cover the entire surface of both sides of the valve body 511, but is designed to be blank at the edge of the valve body 511. This can reduce the stress when the valve plate 51 is welded and fixed to the connecting ring 52 and the fourth annular segment 66, and reduce the risk of the valve plate 51 cracking.

[0155] In summary, the relays of the embodiments of this application have at least the following advantages and beneficial effects:

[0156] The relay in this embodiment, on the one hand, by setting valve plates 51 to release overpressure gas, ensures that the relay will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the housing 10 under abnormal operating conditions such as short circuit and overload disconnection, thereby increasing the reliability of the product; on the other hand, the relay also includes a protective ring 60, which is fixedly set relative to the housing 10, and all the valve plates 51 are located in the protective cavity 61 enclosed by the protective ring 60. During the flow of components, since all the valve plates 51 are located in the protective cavity 61 of the protective ring 60, the protective ring 60 plays a role in protecting the valve plates 51 and preventing the valve plates 51 from breaking due to collision with other components; furthermore, the protective ring 60 has a ring structure and does not cover the valve plates 51. When the valve plates 51 break due to the impact of high temperature gas, the protective ring 60 will not affect the timely release of gas inside the housing 10 through the pressure relief hole 122.

[0157] Furthermore, the yoke plate 12 has a limiting protrusion 125 on the side facing the connecting ring 52, and the limiting protrusion 125 is located inside the connecting ring 52. After the connecting ring 52 is installed on the housing 10, the limiting protrusion 125 can prevent the connecting ring 52 from having a large displacement relative to the housing 10, ensuring welding reliability.

[0158] Furthermore, the second annular segment 522 of the connecting ring 52 is an inwardly recessed annular structure. When the second annular segment 522 is fixed to the valve plate 51 by welding, the inwardly recessed structure of the second annular segment 522 improves the flexibility of the entire connecting ring 52, which can further absorb the stress generated during the welding process and prevent the valve plate 51 from cracking due to stress.

[0159] Furthermore, the metallization layer 512 does not cover the entire surface of one side of the valve body 511, but is designed to leave a blank at the edge of the valve body 511. This reduces the stress when the valve plate 51 is welded and fixed to the connecting ring 52, and reduces the risk of the valve plate 51 breaking.

[0160] Furthermore, the valve plate 51 is connected to the protective ring 60. The protective ring 60 not only protects the valve plate 51, but also serves to install the valve plate 51. In other words, one protective ring 60 achieves two functions, eliminating the need for additional components to connect the valve plate 51 and saving material costs.

[0161] Furthermore, the connecting ring 52 and the fourth annular segment 66 are respectively welded to the two sides of the valve plate 51 in the thickness direction. In this way, during the welding process, the welding attraction on both sides of the valve plate 51 cancels each other out, thereby preventing the valve plate 51 from cracking due to welding stress.

[0162] Furthermore, by providing a shielding member 74 within the housing 70 to block the vent 73, and forming a venting channel 75 between the shielding member 74 and the housing wall of the housing 70, the gas first impacts the shielding member 74 before flowing through the venting channel 75 to the vent 73 when the gas breaks through the valve plate 51 and begins to release. This design prevents gas pressure from directly acting on the area around the vent 73, thereby reducing the risk of cracking in the structure surrounding the vent 73 of the housing 70. In addition, since the shielding member 74 blocks at least a portion of the vent 73, the internal structure of the relay cannot be directly seen when viewed from the outside of the housing 70 through the vent 73, improving aesthetics.

[0163] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0164] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0165] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0166] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0167] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A relay characterized by comprising: The application relates to a pressure relief valve, comprising: a shell, a shell wall of the shell having a pressure relief hole penetrating through an inner wall surface and an outer wall surface of the shell wall; a valve assembly arranged on the shell, the valve assembly comprising a valve sheet configured to break and open the pressure relief hole when the gas pressure in the shell is greater than or equal to a threshold value; and a protection ring fixedly arranged relative to the shell and surrounding a protection cavity in communication with the pressure relief hole, wherein all the valve sheets are located in the protection cavity. The shell has a first positioning structure, the protection ring has a second positioning structure, and the first positioning structure and the second positioning structure are in positioning cooperation.

2. The relay according to claim 1, characterized in that One of the first positioning structure and the second positioning structure is a positioning protrusion, and the other is a positioning hole, and the positioning protrusion is arranged in the positioning hole.

3. The relay according to claim 2, characterized in that The protection ring comprises a ring body and a plurality of lugs, the ring body surrounds the protection cavity, the plurality of lugs are protruded on the outer circumferential side of the ring body and are arranged along the circumference of the ring body, each lug is in abutment with the shell wall of the shell and has the positioning hole, and the shell wall of the shell is provided with the positioning protrusion at a position corresponding to the lug.

4. The relay according to claim 3, characterized in that The valve assembly further comprises a connecting ring, at least a portion of the connecting ring being located in the protection cavity.

5. The relay of claim 1, wherein The axial two ends of the connecting ring are connected with the shell and the valve sheet respectively, the axial two ends of the connecting ring have a first opening and a second opening, the first opening is in communication with the pressure relief hole, and the valve sheet is arranged on the second opening. The connecting ring comprises a first annular segment and a second annular segment connected with each other, the first annular segment and the second annular segment are arranged along the axial direction of the connecting ring, one end of the first annular segment away from the second annular segment has the first opening, and the second annular segment gradually shrinks inward from the first annular segment to form an annular structure with gradually decreasing inner diameters, and one end of the second annular segment away from the first annular segment has the second opening.

6. The relay of claim 5, wherein The shell wall of the shell has an annular groove surrounding the outer periphery of the pressure relief hole.

7. The relay of claim 5, wherein The edge of the first opening of the connecting ring is located in the annular groove, and the annular groove is further provided with a solder for fixedly connecting the connecting ring with the shell. The shell wall of the shell is further provided with a limiting protrusion on the side surface facing the connecting ring, and the limiting protrusion is located on the inner side of the connecting ring.

8. The relay of claim 5, wherein The valve sheet comprises a valve body and a metallized layer, the metallized layer is in abutment with one side surface of the valve body in the thickness direction, and the metallized layer is connected with the connecting ring.

9. The relay of claim 5, wherein, The orthographic projection of the metallized layer on a target plane is a first projection, the orthographic projection of the valve body on the target plane is a second projection, the first projection falls within the second projection, and the target plane is perpendicular to the thickness direction of the valve sheet. The valve sheet is connected to the protection ring.

10. The relay of claim 1, wherein The protection ring comprises:

11. The relay according to claim 10, characterized in that a third annular segment connected with the shell, the third annular segment surrounds the protection cavity having a third opening, and the third opening is in communication with the pressure relief hole. ​ A fourth annular segment is connected to the third annular segment away from the shell, and is bent from the third annular segment to extend into the protection cavity and enclose a fourth opening; wherein the valve sheet is connected to the fourth annular segment, and a cover is arranged at the fourth opening.

12. The relay of claim 11, wherein, The fourth annular segment comprises: a vertical segment inside the third annular segment, one end of the vertical segment has a fourth opening, and the valve sheet is connected to the vertical segment; and a bent segment, one end of the bent segment is connected to the other end of the vertical segment, and the other end of the bent segment is connected to the end of the third annular segment away from the shell.

13. The relay of claim 12, wherein, The vertical segment and the third annular segment form a concentric ring structure.

14. The relay of claim 11, wherein, The valve sheet is located between the pressure relief hole and the fourth annular segment.

15. The relay of claim 11, wherein, The valve assembly further comprises a connecting ring, at least part of the connecting ring is located in the protection cavity, one end of the connecting ring is welded to the shell, and the other end is welded to the surface of the valve sheet away from the fourth annular segment.

16. The relay of claim 15, wherein, The shell wall of the shell has an annular groove, which surrounds the outer periphery of the pressure relief hole; The edge of the third opening of the third annular segment and the end of the connecting ring away from the valve sheet are located in the annular groove, and welding material is arranged in the annular groove, which is used to fixedly connect the connecting ring, the protection ring and the shell.

17. The relay of claim 15, wherein, The valve sheet comprises a valve body and two metallized layers, the two metallized layers are respectively attached to the two side surfaces in the thickness direction of the valve body, and the two metallized layers are respectively connected to the connecting ring and the fourth annular segment; Wherein, the orthographic projection of the metallized layer on a target plane is a first projection, the orthographic projection of the valve body on the target plane is a second projection, and the first projection falls within the second projection; the target plane is perpendicular to the thickness direction of the valve sheet.

18. The relay of claim 10, wherein, The protection ring comprises: a third annular segment enclosing the protection cavity with a third opening; a fourth annular segment connected to the end of the third annular segment away from the third opening, and bent from the third annular segment to extend into the protection cavity and enclose a fourth opening; wherein the fourth annular segment is connected to the shell, the valve sheet is connected to the fourth annular segment, and a cover is arranged at the fourth opening.

19. The relay of claim 18, wherein, The fourth annular segment comprises: a vertical segment inside the third annular segment, one end of the vertical segment has a fourth opening, and the valve sheet is connected to the vertical segment; and a bent segment, one end of the bent segment is connected to the other end of the vertical segment, and the other end of the bent segment is connected to the end of the third annular segment away from the third opening; wherein the bent segment is connected to the shell.

20. The relay of claim 19, wherein, The vertical segment and the third annular segment form a concentric ring structure.

21. The relay of claim 10, wherein, The valve sheet comprises a valve body and a metallized layer, the metallized layer is attached to one side surface in the thickness direction of the valve body, and the metallized layer is connected to the protection ring; The metalized layer has a first projection on a target plane, the valve body has a second projection on the target plane, and the first projection falls within the second projection.

22. The relay of claim 1, wherein, The valve plate covers the pressure relief hole.

23. The relay of claim 1, wherein The protection ring surrounds the outer periphery of the valve plate.

24. The relay of claim 1, wherein, The valve assembly is convex on the inner wall surface or the outer wall surface of the shell.

25. The relay of claim 1, wherein, The relay further comprises a moving contact and a stationary contact, the moving contact and the stationary contact are located in the shell, the stationary contact is fixedly arranged relative to the shell, and the moving contact is used to contact or separate from the stationary contact.

26. The relay of claim 1, wherein The structural strength of the valve plate is less than that of the shell.

27. The relay of claim 26, wherein, The valve plate and the shell are made of different materials, and / or the thickness of the valve plate is different from the thickness of the shell wall.

28. The relay according to any one of claims 1 to 27, characterized in that The shell comprises an insulating cover and a yoke plate, the insulating cover covers one side surface of the yoke plate in the thickness direction, the pressure relief hole penetrates the yoke plate in the thickness direction of the yoke plate and is covered by the insulating cover, and the protection ring is located on one side of the yoke plate in the thickness direction and is connected with the yoke plate.

29. The relay of claim 1, wherein, The relay further comprises a shell, the shell is arranged in the shell; the shell has one or more air outlets, the air outlets penetrate the inner wall surface and the outer wall surface of the shell.

30. The relay of claim 29, wherein, The shell further comprises a shielding member, the shielding member shields at least part of the air outlets, and a gas outlet channel in communication with the air outlets is formed between the shielding member and the inner wall surface of the shell wall.

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