Relay

Abstract

To provide a relay capable of improving safety in order to solve the problem in the related technology that the relay can easily explode.SOLUTION: A relay includes an insulation cover, a first yoke plate, a contact assembly, a driving assembly, and a pressure relief valve assembly. The first yoke plate connects with the insulation cover and configures a contact chamber. The first yoke plate has a pressure relief hole that penetrates two opposite side surfaces of the first yoke plate along a thickness direction and the pressure relief hole communicates with the contact chamber. The driving assembly is connected with a movable contact piece and drives the movable contact piece to move, so that two ends of the movable contact piece are in contact with or separated from respective stationary contact leading-out terminals. The pressure relief valve assembly is on the first yoke plate and is used to close the pressure relief hole when a gas pressure in the contact chamber is less than a certain threshold and to be broken to open the pressure relief hole when the gas pressure in the contact chamber is greater than or equal to the certain threshold.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of relay technology, and more particularly to a relay having a pressure relief valve assembly. [Background technology]

[0002] As the driving range requirements of new energy vehicles are constantly improving, the requirements for high voltage DC relays are also becoming higher, for example, under normal circumstances, the heat loss of the high voltage DC relay is required to be small, and when the battery pack is short-circuited, the short-circuit resistance current and voltage of the relay are required to be large due to the large battery capacity. When the short-circuit load is large, the short-circuit current generates an electric repulsive force in the high voltage DC relay contacts, causing the contacts to bounce off and separate, and a contact arc is generated, and the current and voltage of the load short circuit are both high, causing an instantaneous and intense arc burning between the contacts.

[0003] In addition, since it is necessary to ensure the reliability of the contact resistance of the contacts, the contact systems of many high voltage DC relays are sealed by a contact sealing cavity, and the inside of the contact sealing cavity is filled with a gas such as hydrogen gas or nitrogen gas at a certain pressure to assist in arc extinguishing.

[0004] However, during the operation of the relay in the related art, at the moment of high current short circuit or overload interruption of the contact system, the contact sealing cavity is prone to explosion. Summary of the Invention

[0005] The embodiment of the present invention provides a relay that can improve safety to solve the problem of explosiveness existing in the related art.

[0006] A relay according to an embodiment of the present invention includes an insulating cover, a first yoke plate, a contact assembly, a drive assembly, and a pressure relief valve assembly. a first yoke plate connected to the insulating cover and forming a contact chamber together with the insulating cover, the first yoke plate having a pressure relief hole penetrating two opposite side surfaces of the first yoke plate along the thickness direction, the pressure relief hole communicating with the contact chamber; a contact assembly comprising a pair of fixed contact pull-out ends and a movable contactor, the fixed contact pull-out end being provided on the insulating cover, one end of the fixed contact pull-out end entering the inside of the contact chamber, the movable contactor being located in the contact chamber; a drive assembly connected to the movable contactor and used to drive the movement of the movable contactor to respectively realize contact or separation between both ends of the movable contactor and the pair of fixed contact pull-out ends; a pressure relief valve assembly provided on the first yoke plate, closing the pressure relief hole when the gas pressure in the contact chamber is lower than a threshold value, and breaking through to open the pressure relief hole when the gas pressure in the contact chamber is equal to or higher than the threshold value.

[0007] According to some embodiments of the present invention, the pressure relief valve assembly includes a valve plate that is integrally formed with the first yoke plate, is provided at the pressure relief hole, and is used to close or open the pressure relief hole.

[0008] According to some embodiments of the present invention, the first yoke plate has a first side and a second side on opposite sides, the valve plate has a first side and a second side on opposite sides, the first side of the first yoke plate is connected to the insulating cover, the first side of the valve plate is connected to the hole wall of the pressure relief hole, and the second side of the valve plate is flush with the second side of the first yoke plate.

[0009] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate that is provided separately from the first yoke plate, is provided at the pressure relief hole, and is used to close or open the pressure relief hole.

[0010] According to some embodiments of the present invention, the first yoke plate has a first side, the first side is connected to the insulating cover, and a sink is provided on the first side, the sink is in communication with the pressure relief hole, The valve plate has a first side, the valve plate is disposed within the sink, and the first side of the valve plate is flush with the first side.

[0011] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the first yoke plate via the transition piece.

[0012] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a protective cover, the protective cover is connected to the first yoke plate and is provided covering a surface of the valve plate, the protective cover having an air vent.

[0013] According to some embodiments of the present invention, a vent passage is further provided between the drive assembly and the first yoke plate, the vent passage communicating with the pressure relief hole.

[0014] According to some embodiments of the present invention, the drive assembly comprises an electromagnet unit and a push rod unit; an electromagnet unit is provided on a side of the first yoke plate away from the insulating cover, and the electromagnet unit and the first yoke plate form the gas vent passage; A push rod unit is drivingly connected to the electromagnet unit.

[0015] According to some embodiments of the present invention, the electromagnet unit comprises a coil bobbin and a coil; the coil bobbin is hollow and forms the gas vent passage together with the first yoke plate; A coil surrounds the coil bobbin.

[0016] According to some embodiments of the present invention, the vent passages are provided in the first yoke plate and / or the coil bobbin.

[0017] According to some embodiments of the present invention, the relay further includes a metal cover, the metal cover is connected to the first yoke plate and forms a driving chamber together with the first yoke plate, the first yoke plate has a through hole, and the contact chamber communicates with the driving chamber through the through hole; The metal cover is bored into the coil bobbin, and the push rod unit is movably provided in the driving chamber and passes through the through hole to be connected to the movable contact.

[0018] According to some embodiments of the present invention, the electromagnet unit further comprises a fixed core, a movable core, and a first elastic part; a fixed core is fixedly provided within the metal cover, a portion of the fixed core extends into the through hole, the fixed core has a first bore, the first bore is provided corresponding to the position of the through hole, and is used for the push rod unit to be bored therein; the movable core is movably provided within the metal cover and opposed to the fixed core, the movable core is connected to the push rod unit, and is used to be attracted by the fixed core when the coil is energized, A first elastic part is disposed between the fixed core and the movable core and is used to reset the movable core when the coil is de-energized.

[0019] According to some embodiments of the present invention, the airflow direction of the vent passage is perpendicular to the axis of the pressure relief vent.

[0020] According to some embodiments of the present invention, the relay further comprises a housing, the housing having a hollow chamber, the hollow chamber communicating with an exterior of the housing; The insulating cover, the first yoke plate, the drive assembly and the pressure relief valve assembly are all located within the hollow chamber.

[0021] According to some embodiments of the present invention, the housing comprises a first case and a second case; A second case is detachably connected to the first case, and a vent structure is provided in the first case and / or the second case, and the vent structure communicates with the hollow chamber.

[0022] According to some embodiments of the present invention, the venting structure comprises a slit, the slit being formed between the first case and the second case.

[0023] According to some embodiments of the present invention, the venting structure comprises a vent hole and / or a vent cover and / or a vent grill.

[0024] According to some embodiments of the present invention, the insulating cover comprises a ceramic cover and a connecting piece, The fixed contact lead end is provided on the ceramic cover, One end of the connection part is connected to the opening edge of the ceramic cover, and the other end is connected to the first yoke plate.

[0025] According to some embodiments of the present invention, the structural strength of the pressure relief valve assembly is less than the structural strength of the contact chamber.

[0026] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0027] The relay of the embodiment of the present invention is provided with a pressure relief valve assembly on the first yoke plate, which is used to release over-pressure gas. Further, under abnormal circumstances such as short circuit or overload interruption of the contact assembly, the relay will not explode and disintegrate the sealed chamber due to the rapid expansion of gas caused by the high temperature inside the contact chamber, thereby improving the reliability of the product.

[0028] In addition, since the first yoke plate has a flat plate shape, the pressure relief valve assembly can be easily molded onto the first yoke plate. Furthermore, since the processing process of the pressure relief valve assembly and the first yoke plate is simple, the sealability of the connection between the first yoke plate and the pressure relief valve assembly can be easily controlled, and the problem of the sealability of the contact chamber being destroyed by the installation of the pressure relief valve assembly can be avoided.

[0029] Moreover, the housing of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can exhaust the released gas in a timely manner and avoid the release from causing pollution to other electronic devices. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 is a top view of a relay according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 2 is a cross-sectional view of BB in FIG. [Figure 4] FIG. 2 is an exploded schematic diagram of a relay according to an embodiment of the present invention; [Diagram 5] FIG. 2 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in the first embodiment of the present invention. [Figure 6] FIG. 11 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a second embodiment of the present invention. [Figure 7] FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a third embodiment of the present invention. [Figure 8]FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a fourth embodiment of the present invention. [Figure 9] FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a fifth embodiment of the present invention. [Figure 10] FIG. 13 is an exploded schematic diagram of a pressure relief valve assembly and a first yoke plate in a sixth embodiment of the present invention; [Figure 11] FIG. 11 is a cross-sectional view of the pressure relief valve assembly and the first yoke plate of FIG. 10 after assembly. [Figure 12] FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a seventh embodiment of the present invention. [Figure 13] FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in an eighth embodiment of the present invention. [Figure 14] FIG. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate according to a ninth embodiment of the present invention. [Figure 15] FIG. 23 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a tenth embodiment of the present invention. [Figure 16] FIG. 23 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in an eleventh embodiment of the present invention. [Figure 17] FIG. 23 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a twelfth embodiment of the present invention. [Figure 18] FIG. 23 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a thirteenth embodiment of the present invention. [Figure 19] 4 is a schematic diagram showing a gas vent passage provided in a first yoke plate in an embodiment of the present invention. FIG. [Figure 20] FIG. 2 is an exploded schematic view of a first embodiment of a housing according to the present invention. [Figure 21] FIG. 4 is an exploded schematic view of a housing according to a second embodiment of the present invention. [Figure 22] FIG. 11 is an exploded schematic view of a housing according to a third embodiment of the present invention. [Figure 23]FIG. 13 is an exploded schematic view of a fourth embodiment of a housing according to the present invention. [Figure 24] FIG. 13 is an exploded schematic view of a housing according to a fifth embodiment of the present invention. [Diagram 25] FIG. 2 is a top view of a relay according to an embodiment of the present invention. [Figure 26] FIG. 26 is a cross-sectional view of CC in FIG. 25. [Figure 27] FIG. 2 is an exploded schematic diagram of a relay according to an embodiment of the present invention; [Figure 28] FIG. 2 is a cross-sectional view of the insulating cover and the valve plate after assembly in the first embodiment of the present invention. [Figure 29] FIG. 11 is a cross-sectional view of an insulating cover and a valve plate after assembly in a second embodiment of the present invention. [Diagram 30] FIG. 11 is a cross-sectional view of an insulating cover and a valve plate after assembly in a third embodiment of the present invention. [Diagram 31] FIG. 10 is a cross-sectional view of an insulating cover and a valve plate after assembly in a fourth embodiment of the present invention. [Diagram 32] FIG. 13 is a cross-sectional view of an insulating cover and a valve plate after assembly in a fifth embodiment of the present invention. [Diagram 33] FIG. 13 is a perspective view of an insulating cover and a valve plate after assembly in a sixth embodiment of the present invention. [Diagram 34] FIG. 13 is a perspective view of an insulating cover and a valve plate after assembly in a seventh embodiment of the present invention. [Diagram 35] FIG. 13 is a cross-sectional view of an insulating cover and a valve plate after assembly in an eighth embodiment of the present invention. [Diagram 36] FIG. 36 is an enlarged view of a portion of a portion B in FIG. [Figure 37] FIG. 13 is a cross-sectional view of an insulating cover and a valve plate according to a ninth embodiment of the present invention after assembly. [Figure 38] FIG. 2 is a cross-sectional view of the first embodiment of the present invention after assembly of a metal cover and a valve plate. [Figure 39] FIG. 11 is a cross-sectional view of a second embodiment of the present invention after assembly of a metal cover and a valve plate. [Diagram 40] FIG. 11 is a cross-sectional view of a third embodiment of the present invention after assembly of a metal cover and a valve plate. [Diagram 41] FIG. 13 is a cross-sectional view of a fourth embodiment of the present invention after assembly of a metal cover and a valve plate. [Diagram 42] FIG. 13 is a cross-sectional view of a fifth embodiment of the present invention after assembly of a metal cover and a valve plate. [Diagram 43] FIG. 13 is a cross-sectional view of a sixth embodiment of the present invention after assembly of a metal cover and a valve plate. [Diagram 44] FIG. 13 is a cross-sectional view of the seventh embodiment of the present invention after assembly of the metal cover and the valve plate. [Diagram 45] 1 is a cross-sectional view of a protective cover attached to a container wall in an embodiment of the present invention. [Diagram 46] FIG. 2 is an exploded schematic view of a first embodiment of a housing according to the present invention. [Figure 47] FIG. 4 is an exploded schematic view of a housing according to a second embodiment of the present invention. [Figure 48] FIG. 11 is an exploded schematic view of a housing according to a third embodiment of the present invention. [Figure 49] FIG. 13 is an exploded schematic view of a fourth embodiment of a housing according to the present invention. [Figure 50] FIG. 13 is an exploded schematic view of a housing according to a fifth embodiment of the present invention. [Figure 51] FIG. 2 is a top view of a relay according to an embodiment of the present invention. [Figure 52] FIG. 52 is a cross-sectional view taken along line DD in FIG. 51. [Diagram 53] FIG. 2 is a cross-sectional view of the connecting part and the valve plate after assembly in the first embodiment of the present invention. [Figure 54] FIG. 54 is an enlarged view of a portion of area C in FIG. 53. [Figure 55] FIG. 11 is a cross-sectional view of a connecting part and a valve plate after assembly in a second embodiment of the present invention. [Figure 56] 1 is a cross-sectional view of a protective cover attached to a connecting part in an embodiment of the present invention. [Figure 57] FIG. 2 is an exploded schematic view of a first embodiment of a housing according to the present invention. [Figure 58] FIG. 4 is an exploded schematic view of a housing according to a second embodiment of the present invention. [Figure 59] FIG. 11 is an exploded schematic view of a housing according to a third embodiment of the present invention. [Figure 60] FIG. 13 is an exploded schematic view of a fourth embodiment of a housing according to the present invention. [Figure 61] FIG. 13 is an exploded schematic view of a housing according to a fifth embodiment of the present invention. [Figure 62] FIG. 2 is a top view of a relay according to an embodiment of the present invention. [Figure 63] FIG. 63 is a cross-sectional view of EE in FIG. [Figure 64] FIG. 2 is a cross-sectional view of the metal cover and the valve plate after assembly in the first embodiment of the present invention. [Figure 65] FIG. 11 is a cross-sectional view of a metal cover and a valve plate after assembly in a second embodiment of the present invention. [Figure 66] FIG. 11 is a cross-sectional view of a metal cover and a valve plate after assembly in a third embodiment of the present invention. [Figure 67] FIG. 10 is a cross-sectional view of a metal cover and a valve plate after assembly in a fourth embodiment of the present invention. [Figure 68] FIG. 13 is a cross-sectional view of a metal cover and a valve plate after assembly in a fifth embodiment of the present invention. [Figure 69] FIG. 13 is a cross-sectional view of a metal cover and a valve plate after assembly in a sixth embodiment of the present invention. [Figure 70] FIG. 13 is a cross-sectional view of a metal cover and a valve plate after assembly in a seventh embodiment of the present invention. [Figure 71] 1 is a cross-sectional view of a protective cover attached to a metal cover in an embodiment of the present invention. [Figure 72] FIG. 2 is an exploded schematic view of a first embodiment of a housing according to the present invention. [Figure 73]FIG. 4 is an exploded schematic view of a housing according to a second embodiment of the present invention. [Figure 74] FIG. 11 is an exploded schematic view of a housing according to a third embodiment of the present invention. [Figure 75] FIG. 13 is an exploded schematic view of a fourth embodiment of a housing according to the present invention. [Figure 76] FIG. 13 is an exploded schematic view of a housing according to a fifth embodiment of the present invention. [Figure 77] FIG. 2 is a top view of a relay according to an embodiment of the present invention. [Figure 78] FIG. 78 is a cross-sectional view of FF in FIG. [Figure 79] FIG. 2 is an exploded schematic diagram of a relay according to an embodiment of the present invention; [Figure 80] FIG. 2 is a cross-sectional view of the ceramic cover and the valve plate after assembly in the first embodiment of the present invention. [Figure 81] FIG. 11 is a cross-sectional view of a ceramic cover and a valve plate after assembly in a second embodiment of the present invention. [Figure 82] FIG. 11 is a cross-sectional view of a ceramic cover and a valve plate after assembly in a third embodiment of the present invention. [Figure 83] FIG. 10 is a cross-sectional view of the ceramic cover and the valve plate after assembly in the fourth embodiment of the present invention. [Figure 84] FIG. 13 is a cross-sectional view of a ceramic cover and a valve plate after assembly in a fifth embodiment of the present invention. [Figure 85] FIG. 13 is a perspective view of a ceramic cover and a valve plate after assembly in a sixth embodiment of the present invention. [Figure 86] FIG. 13 is a perspective view of a ceramic cover and a valve plate after assembly in a seventh embodiment of the present invention. [Figure 87] FIG. 2 is a cross-sectional view of a protective cover attached to a ceramic cover in an embodiment of the present invention. [Figure 88] FIG. 2 is an exploded schematic view of a first embodiment of a housing according to the present invention. [Figure 89] FIG. 4 is an exploded schematic view of a housing according to a second embodiment of the present invention. [Figure 90] FIG. 11 is an exploded schematic view of a housing according to a third embodiment of the present invention. [Figure 91] FIG. 13 is an exploded schematic view of a fourth embodiment of a housing according to the present invention. [Figure 92] FIG. 13 is an exploded schematic view of a housing according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Next, the exemplary embodiments will be described in more detail with reference to the drawings. However, the exemplary embodiments can be implemented in various forms and should not be understood to be limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present invention is comprehensive and complete, and fully conveys the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, and detailed descriptions thereof will be omitted.

[0032] As described in the Background Art, in the relay contact system of the related art, at the moment of high current short circuit or overload cutoff, the contact sealing cavity is prone to explosion, which is a safety hazard. The inventors have found in their research that when the contact inside the contact sealing cavity suddenly burns with an arc, high temperature is instantaneously generated inside the sealing cavity, which causes the air pressure inside the contact sealing cavity to instantly and rapidly rise, and when the air pressure strength inside the contact sealing cavity is greater than the strength of the components or the strength of the connection points of the contact sealing cavity, the contact sealing cavity of the relay is prone to explosion.

[0033] As shown in Figures 1 to 4, Figure 1 is a top view of a relay in an embodiment of the present invention. Figure 2 is a cross-sectional view taken along line AA in Figure 1. Figure 3 is a cross-sectional view taken along line BB in Figure 1. Figure 4 is a schematic exploded view of the relay in an embodiment of the present invention.

[0034] The relay in the embodiment of the present invention includes a housing 1, an insulating cover 21, a first yoke plate 22, a contact assembly 3, a drive assembly 4, and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, which communicates with the outside of the housing 1. The insulating cover 21 is provided within the hollow chamber 14. The first yoke plate 22 is connected to the insulating cover 21 and forms a contact chamber 27 together with the insulating cover 21. The first yoke plate 22 has a pressure relief hole 221, which penetrates two opposite side surfaces of the first yoke plate 22 along the thickness direction, and the contact chamber 27 communicates with the hollow chamber 14 through the pressure relief hole 221. The contact assembly 3 includes a fixed contact lead end 31 and a movable contact 32. The fixed contact lead end 31 is provided in the insulating cover 21, and one end of the fixed contact lead end 31 enters the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The drive assembly 4 is provided in the hollow chamber 14, and is used to drive the movable contact 32 to move and respectively realize the contact or separation between both ends of the movable contact 32 and the fixed contact lead end 31. The pressure relief valve assembly 5 is provided in the first yoke plate 22, and is used to close the pressure relief hole 221 when the gas pressure in the contact chamber 27 is lower than a certain threshold, and to break through and open the pressure relief hole 221 when the gas pressure in the contact chamber 27 is equal to or higher than a certain threshold. When the pressure relief valve assembly 5 closes the pressure relief hole 221, it maintains the sealing of the contact chamber 27 and ensures the normal operation of the relay. Of course, in other embodiments, the pressure relief valve assembly 5 need only ensure that when the pressure relief hole 221 is closed, the contact chamber 27 is not absolutely sealed and the relay operates normally.

[0035] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the first yoke plate 22, which is used to close or open the pressure relief hole 221. When the contact assembly 3 is in a normal operating state, the intensity of the gas pressure in the contact chamber 27 is less than the threshold, so that the pressure relief valve assembly 5 is not broken by the air pressure in the contact chamber 27, and still keeps the pressure relief hole 221 closed, and the contact chamber 27 can maintain a seal. When the contact assembly 3 is in an abnormal operating state, the intensity of the gas pressure in the contact chamber 27 is equal to or greater than the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the contact chamber 27, and the contact chamber 27 communicates with the hollow chamber 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the contact chamber 27 can be released to the hollow chamber 14 through the pressure relief hole 221, and finally released to the outside of the housing 1. That is, in the process of the gradual increase in the intensity of the gas pressure in the contact chamber 27 under abnormal operating conditions, the gas pressure will first break through the pressure relief valve assembly 5, and then the suddenly increased gas pressure will be released through the pressure relief hole 221, so that the air pressure inside the contact chamber 27 will not continue to rise and will not reach the structural strength of the contact chamber 27, thus avoiding the explosion of the contact chamber 27. Under normal operating conditions, the gas pressure in the contact chamber 27 will not break through the pressure relief valve assembly 5, and the pressure relief valve assembly 5 can still play the role of sealing the pressure relief hole 221.

[0036] In addition, since the pressure relief valve assembly 5 is provided on the first yoke plate 22 and the chamber wall of the contact chamber 27 includes the first yoke plate 22, the pressure relief valve assembly 5 can directly receive the impact of the gas inside the contact chamber 27. When the contact assembly 3 is in an abnormal operating state, the generated high-temperature gas can directly break through the pressure relief valve assembly 5, and further, the gas inside the contact chamber 27 can be quickly released through the pressure relief hole 221.

[0037] The term "normal operating state" means that the relay current is in the rated operating state, and the term "abnormal operating state" means that the contact assembly 3 is in a moment of high current short circuit, overload interruption, etc. The term "threshold" refers to a pressure strength that is slightly larger than the strength of the gas pressure in the contact chamber 27 when the relay is in a normal operating state. Depending on the relay model, the threshold value is also suitable for adjustment, but cannot be larger than the structural strength of the contact chamber 27.

[0038] That is, when the relay is operating normally, the pressure in the contact chamber will not reach this threshold and will not breach the pressure relief valve assembly 5. When the relay is in an abnormal operating state, the pressure in the contact chamber will be equal to or greater than this threshold and the pressure relief valve assembly 5 will be breached by the gas.

[0039] In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the contact chamber 27. Thus, when the relay is in an abnormal operating state and the gas pressure in the contact chamber gradually increases, the pressure relief valve assembly 5 will be breached by the gas before the contact chamber 27.

[0040] The design of the pressure relief valve assembly 5 so that its structural strength is smaller than that of the contact chamber 27 can be achieved by using different materials and / or structures. For example, when the pressure relief valve assembly 5 and the chamber wall of the contact chamber 27 are made of the same material, the pressure relief valve assembly 5 can be designed to be thin and smaller than the chamber wall of the contact chamber 27, so that the gas with a gradually increased temperature breaks through the pressure relief valve assembly 5 first. Of course, when the pressure relief valve assembly 5 and the chamber wall of the contact chamber 27 are made of the same material, the pressure relief valve assembly 5 can be made of ceramic, but the contact chamber 27 can be made of metal, so that the gas breaks through the pressure relief valve assembly 5 first. Or, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall of the contact chamber 27 is thick and made of metal. Of course, other suitable methods can be adopted to make the structural strength of the pressure relief valve assembly 5 smaller than that of the contact chamber 27, and they will not be listed here.

[0041] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or assemblies inherent to those processes, methods, products or devices.

[0042] In addition, the relay according to the embodiment of the present invention does not include the housing 1, and after assembling the insulating cover 21, the first yoke plate 22, the contact assembly 3, the drive assembly 4, and the pressure relief valve assembly 5, the relay may be directly installed in an application product such as a battery pack, an electrical control box, etc.

[0043] Next, refer to FIG. 2 to FIG. 4. In this embodiment, the contact assembly 3 includes two fixed contact pull-out ends 31 as current inflow and current outflow, and one movable contact 32. The movable contact 32 may be a straight piece, and both ends of the drive assembly 32 can contact the two fixed contact pull-out ends 31 along the longitudinal direction of the movable contact 32 by the action of the drive assembly 4, respectively, to realize the on-state of the load. The bottom of the fixed contact pull-out end 31 can be a fixed contact, and both ends of the movable contact 32 in the longitudinal direction can be a movable contact. The movable contacts at both ends of the movable contact 32 may protrude from other parts of the movable contact 32, or may be flush with other parts.

[0044] The fixed contact may be provided integrally or separately at the bottom of the fixed contact drawn end 31, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction in which the movable contactor 32 extends.

[0045] The two fixed contact pull-out ends 31 are provided on the insulating cover 21, for example, on the top of the insulating cover 21. One end of each fixed contact pull-out end 31 enters the inside of the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The one end of the fixed contact pull-out end 31 that enters the inside of the contact chamber 27 is used to contact the movable contact 32.

[0046] The relay also comprises an arc-extinguishing unit 7 mounted in the hollow chamber 14 of the housing 1 for extinguishing the arc of the contact assembly 3 .

[0047] In this embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The arc-extinguishing magnets 71 may be permanent magnets, and each of the arc-extinguishing magnets 71 may be substantially rectangular. The two arc-extinguishing magnets 71 are provided on both sides of the insulating cover 21, respectively, and are provided facing each other along the longitudinal direction of the movable contactor 32.

[0048] 2, the two arc-extinguishing magnets 71 are located on both the left and right sides of the insulating cover 21. In this embodiment, the polarities of the opposing faces of the two arc-extinguishing magnets 71 are opposite. That is, the left face of the arc-extinguishing magnet 71 located on the left side of the insulating cover 21 is an S pole and the right face is an N pole, and the left face of the arc-extinguishing magnet 71 located on the right side of the insulating cover 21 is an S pole and the right face is an N pole.

[0049] Of course, the polarities of the opposing surfaces of the two arc-extinguishing magnets 71 can also be designed to be the same; for example, the left surface of the arc-extinguishing magnet 71 located on the left side of the insulating cover 21 has a south pole and the right surface has a north pole, and the left surface of the arc-extinguishing magnet 71 located on the right side of the insulating cover 21 has a north pole and the right surface has a south pole.

[0050] In this way, by providing two arc-extinguishing magnets 71 arranged opposite to each other, a magnetic field can be formed around the contact assembly 3. Therefore, the arcs generated between the fixed contact pull-out end 31 and the movable contactor 32 are stretched in directions away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0051] The arc-extinguishing unit 7 further includes two yoke clips 72 arranged corresponding to the positions of the two arc-extinguishing magnets 71. The two yoke clips 72 surround the insulating cover 21 and the two arc-extinguishing magnets 71. The design of the yoke clips 72 surrounding the arc-extinguishing magnets 71 prevents the magnetic field generated by the arc-extinguishing magnets 71 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clips 72 are made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0052] The relay further includes a metal cover 23, which is connected to the first yoke plate 22 and forms a driving chamber 24 together with the first yoke plate 22. The driving chamber 24 is used to accommodate a fixed iron core 413 and a movable iron core 414, as described below. The first yoke plate 22 has a through hole 222, and the contact chamber 27 communicates with the driving chamber 24 through the through hole 222, and the contact chamber 27 and the driving chamber 24 form a common sealed chamber.

[0053] The insulating cover 21 is connected to one side of the first yoke plate 22, and the pressure relief hole 221 and the through hole 222 are located within the orthogonal projection range of the first yoke plate 22, i.e., the insulating cover 21 covers both the pressure relief hole 221 and the through hole 222, such that both the pressure relief hole 221 and the through hole 222 are connected to the contact chamber 27 surrounded by the insulating cover 21 and the first yoke plate 22.

[0054] The metal cover 23 is connected to the other side of the first yoke plate 22, that is, the insulating cover 21 and the metal cover 23 are respectively provided on two opposite side surfaces along the thickness direction of the first yoke plate 22. Furthermore, a through hole 222 is located within the range of orthogonal projection of the metal cover 23 onto the first yoke plate 22, thereby connecting the through hole 222 to the drive chamber 24.

[0055] Since the contact chamber 27 communicates with the driving chamber 24 via the through hole 222 , the gas in the contact chamber 27 can be transmitted into the driving chamber 24 via the through hole 222 .

[0056] The insulating cover 21 may include a ceramic cover 211 and a connecting part 212, and two fixed contact lead ends 31 are provided on the ceramic cover 211. The ceramic cover 211 is connected to the first yoke plate 22 through the connecting part 212. Specifically, the connecting part 212 may be a metal part having a ring structure such as an iron-nickel alloy, and one end of the connecting part 212 may be connected to the opening edge of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesion, etc. The other end of the connecting part 212 is connected to the first yoke plate 22, and may also be connected by laser welding, brazing, resistance welding, adhesion, etc. The connecting part 212 is provided between the ceramic cover 211 and the first yoke plate 22, which can facilitate the connection between the ceramic cover 211 and the first yoke plate 22.

[0057] The drive assembly 4 includes an electromagnet unit 41 and a push rod unit 42. The electromagnet unit 41 is disposed on the side of the first yoke plate 22 away from the insulating cover 21. The push rod unit 42 is drivingly connected to the electromagnet unit 41. The push rod unit 42 is movably provided in the drive chamber 24 and connected to the movable contact 32 through the through hole 222.

[0058] When the electromagnet unit 41 is energized, it can drive and move the push rod unit 42 , which can then move the movable contact 32 to bring it into contact with or away from the fixed contact drawn-out end 31 .

[0059] The electromagnet unit 41 includes a coil bobbin 411, a coil 412, a fixed core 413, and a movable core 414. The coil bobbin 411 is hollow and made of an insulating material. The metal cover 23 is provided in the coil bobbin 411. The coil 412 surrounds the coil bobbin 411. The fixed core 413 is fixed in the metal cover 23, and a part of the fixed core 413 enters the through hole 222. The fixed core 413 has a first hole 4131 provided corresponding to the position of the through hole 222 for the push rod unit 42 to be provided. The movable core 414 is provided movably in the metal cover 23 and is provided opposite the fixed core 413. The movable core 414 is connected to the push rod unit 42, and is used to be attracted to the fixed core 413 when the coil 412 is energized. The armature 414 and the push rod unit 42 may be connected by threads, caulking, welding, or other methods.

[0060] In this embodiment, the coil bobbin 411 is made of a resin material and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are provided on both ends of the hollow cylindrical portion 4112. The coil 412 surrounds the outer periphery of the hollow cylindrical portion 4112. The metal cover 23 is drilled into the hollow cylindrical portion 4112.

[0061] The electromagnet unit 41 further includes a first elastic part 415, which is located inside the metal cover 23 and disposed between the fixed core 413 and the movable core 414, and is used to reset the movable core 414 when the power supply to the coil 412 is cut off. The first elastic part 415 may be a spring, and may be sleeved on the outside of the push rod unit 42.

[0062] 2 to 4, the relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 and the first yoke plate 22 are provided opposite to each other, and the coil bobbin 411 is provided between the first yoke plate 22 and the second yoke plate 25. That is, the first yoke plate 22 is connected to a first flange portion 4111 of the coil bobbin 411, and the second yoke plate 25 is connected to a second flange portion 4113 of the coil bobbin 411.

[0063] A pair of third yoke plates 26 are respectively provided at both ends along the longitudinal direction of the movable contactor 32 of the second yoke plate 25, extend in the direction of the first yoke plate 22, and are connected to both ends along the longitudinal direction of the movable contactor 32 of the first yoke plate 22.

[0064] In this manner, the first yoke plate 22 , the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412 .

[0065] The second yoke plate 25 and the pair of third yoke plates 26 can be formed as an integral structure by, for example, bending. The second yoke plate 25 formed integrally with the first yoke plate 22 and the pair of third yoke plates 26 may be formed as separate structures.

[0066] The relay also includes a magnetically conductive bushing 416 made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof. The magnetically conductive bushing 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the coil bobbin 411 and the outer peripheral surface of the metal cover 23. In this manner, the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the fixed core 413, the movable core 414, and the magnetically conductive bushing 416 together form a magnetic path.

[0067] 2 and 4, the push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixed sheet 427, a push rod 423, a second elastic part 424, a first magnetic conductive body 425, and a second magnetic conductive body 426. The first magnetic conductive body 425 is fixedly connected to the U-shaped bracket 421, and the first magnetic conductive body 425 is provided on the inner wall surface of the top of the U-shaped bracket 421. The second magnetic conductive body 426 is fixedly connected to the movable contact 32. The base 422, the fixed sheet 427, and the upper part of the push rod 423 can be molded by integral injection molding.

[0068] The bottom of the U-shaped bracket 421 is fixedly connected to the fixed sheet 427, the U-shaped bracket 421 and the base 422 are surrounded by a frame structure, and the movable contact 32, the first magnetic conductive body 425, and the second magnetic conductive body 426 are attached in the frame structure surrounded by the U-shaped bracket 421 and the base 422. Furthermore, the second elastic part 424 is also provided in the frame structure surrounded by the U-shaped bracket 421 and the base 422, one end of the second elastic part 424 abuts on the base 422 and the other end abuts on the movable contact 32, and the second elastic part 424 can provide an elastic force such that the movable contact 32 and the second magnetic conductive body 426 tend to move away from the base 422 and approach the first magnetic conductive body 425. The push rod 423 is inserted into the through hole 222 of the first yoke plate 22 and the first hole 4131 of the fixed core 413, and one end of the push rod 423 is fixedly connected to the base 422 and the other end of the push rod 423 is fixedly connected to the movable core 414.

[0069] The second elastic part 424 may be a spring. The first magnetic conductive body 425 and the second magnetic conductive body 426 may be made of a soft magnetic material such as iron, cobalt, nickel, and alloys thereof.

[0070] When the push rod 423 is not moving upward, the top surface of the movable contact 32 abuts against the first magnetic conductive body 425 under the action of the second elastic part 424. When the coil 412 is energized and the push rod 423 is driven to move upward, both ends of the movable contact 32 contact the two fixed contact pull ends 31 respectively. After that, the push rod 423 continues to move upward, and the first magnetic conductive body 425 also continues to move upward following the push rod 423, but since the movable contact 32 has already contacted the two fixed contact pull ends 31, the movable contact 32 cannot continue to move upward, and the overtravel of the contact is realized. The second elastic part provides a contact pressure, which forms a certain gap between the bottom surface of the first magnetic conductive body 425 and the top surface of the movable contact 32, thereby making a magnetic gap exist between the first magnetic conductive body 425 and the second magnetic conductive body 426.

[0071] As shown in Fig. 5, Fig. 5 is a cross-sectional view of a pressure relief valve assembly 5 and a first yoke plate 22 in a first embodiment of the present invention. The pressure relief valve assembly 5 includes a valve plate 51, which is integrally provided in the pressure relief hole 221 of the first yoke plate 22 and is used to close or open the pressure relief hole 221.

[0072] Specifically, the structural strength of the valve plate 51 is smaller than that of the contact chamber 27. When the contact assembly 3 is in an abnormal operating state, the gas whose pressure increases suddenly breaks through the valve plate 51 first and is discharged from the pressure relief hole 221 of the contact chamber 27, so that the gas pressure in the contact chamber 27 does not continue to increase, and the contact chamber 27 is protected.

[0073] The first yoke plate 22 has a first side 223 and a second side 224 provided on opposite sides, and the valve plate 51 has a first side 511 and a second side 512 provided on the opposite sides. The first side 223 is connected to the insulating cover 21, the first side 511 of the valve plate 51 is connected to the hole wall of the pressure relief hole 221, and the second side 512 is flush with the second side 224.

[0074] Of course, the positional relationship between the first yoke plate 22 and both side surfaces of the valve plate 51 is such that the first side surface 511 of the valve plate 51 is flush with the first side surface 223 of the first yoke plate 22 and the second side surface 512 connects the hole wall of the pressure relief hole 221, or the first side surface 511 and the first side surface 223 are spaced a certain distance apart, and the second side surface 512 and the second side surface 224 are spaced a certain distance apart.

[0075] As shown in Fig. 6, Fig. 6 shows a cross-sectional view of a pressure relief valve assembly 5 and a first yoke plate in a second embodiment of the present invention. The same points as those in the second embodiment and the first embodiment will not be described, but the difference is that the pressure relief valve assembly 5 includes a valve plate 51, which is provided separately from the first yoke plate 22, and the pressure relief hole 221 provided in the first yoke plate 22 is used to close or open the pressure relief hole 221.

[0076] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0077] The valve plate 51 can be connected to the first yoke plate 22 by a method such as laser welding, brazing, resistance welding, or adhesive.

[0078] 6, the first yoke plate 22 has a first side 223, which is connected to the insulating cover 21, and a sink 225 is provided on the first side 223, which communicates with the pressure relief hole 221. The valve plate 51 has a first side 511, which is provided in the sink 225, and which is flush with the first side 223. Of course, the first side 511 does not have to be flush with the first side 223.

[0079] As shown in Fig. 7, Fig. 7 is a cross-sectional view of a pressure relief valve assembly 5 and a first yoke plate 22 in a third embodiment of the present invention. The same points between the third embodiment and the second embodiment are omitted, but the difference is that the first yoke plate 22 has a plurality of pressure relief holes 221, and therefore the relay includes a plurality of valve plates 51, and the plurality of valve plates 51 are provided corresponding to the plurality of pressure relief holes 221. Here, the term "plurality" means two or more, unless otherwise specified.

[0080] As shown in Fig. 8, Fig. 8 is a cross-sectional view of a pressure relief valve assembly 5 and a first yoke plate 22 in a fourth embodiment of the present invention. The same points as those in the fourth embodiment and the above embodiments are omitted, but the difference is that the pressure relief valve assembly 5 further includes a transition piece 52, and the valve plate 51 is connected to the first yoke plate 22 via the transition piece 52.

[0081] In this embodiment, the transition piece 52 may be a sheet body. The transition piece 52 is installed in the sink 225, and the transition piece 52 has a second perforation 521 opened in the thickness direction, and the second perforation 521 communicates with the pressure relief hole 221. The valve plate 51 is connected to the transition piece 52 and covers the second perforation 521. In a normal operating state, the valve plate 51 closes the second perforation 521 and the pressure relief hole 221 to keep the contact chamber 27 sealed. In an abnormal operating state, the valve plate 51 is broken by the gas, and the contact chamber 27 communicates with the outside through the second perforation 521 and the pressure relief hole 221.

[0082] The valve plate 51 and the transition piece 52, and the transition piece 52 and the first yoke plate 22 can be connected by laser welding, brazing, resistance welding, adhesive, or the like.

[0083] As shown in Fig. 9, Fig. 9 is a cross-sectional view of the pressure relief valve assembly 5 and the first yoke plate 22 in the fifth embodiment of the present invention. The same points as the fifth embodiment and the fourth embodiment are omitted, but the difference is the shape of the transition piece 52 in the fifth embodiment.

[0084] Specifically, the transition piece 52 in the fifth embodiment is substantially cylindrical. A flange 522 protruding outward along the radial direction is provided at one end of the transition piece 52, and one end of the transition piece 52 is connected to the first yoke plate 22 via the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51. A cavity in the transition piece 52 is provided corresponding to the pressure relief hole 221 of the first yoke plate 22, and the valve plate 51 covers the cavity in the transition piece 52.

[0085] The transition piece 52 has a height such that the valve plate 51 protrudes from the surface of the first yoke plate 22 .

[0086] As shown in Fig. 10 and Fig. 11, Fig. 10 is a schematic diagram of an exploded view of the pressure relief valve assembly 5 and the first yoke plate 22 in the sixth embodiment of the present invention, and Fig. 11 is a cross-sectional view of the pressure relief valve assembly 5 and the first yoke plate 22 in Fig. 10 after assembly. The same points as those in the sixth embodiment and the above embodiments will be omitted, but the differences are as follows: The pressure relief valve assembly 5 further includes a protective cover 53, which is connected to the first yoke plate 22 and is provided to cover the valve plate 51. The protective cover 53 has a vent hole 531, and the gas in the contact chamber 27 can act on the valve plate 51 through the vent hole 531.

[0087] In this embodiment, by adding a protective cover 53, it is possible to prevent gas from breaking through the valve plate 51 in an abnormal operating state, and to protect the valve plate 51 during transportation or installation of the first yoke plate 22, thereby preventing the valve plate 51 from being broken through by external objects.

[0088] The protective cover 53 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, etc.

[0089] The protective cover 53 can be connected to the first yoke plate 22 by a method such as laser welding, brazing, resistance welding, adhesion, or fastening.

[0090] As shown in Fig. 12, Fig. 12 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in the seventh embodiment of the present invention. The same points as those in the seventh embodiment and the above embodiments are omitted, but the differences are as follows: A sink 225 of the first yoke plate 22 is provided on one side of the second side surface 224, and a transition piece 52 is provided within the sink 225 and connected to the first yoke plate 22. A valve plate 51 is connected to the transition piece 52.

[0091] The transition piece 52 has a generally tubular shape, for example, a cylindrical shape. A flange 522 protruding outward along the radial direction is provided at one end of the transition piece 52. The one end of the transition piece 52 is connected to the valve plate 51 via the flange 522, and the other end of the transition piece 52 is connected to the first yoke plate 22.

[0092] The valve plate 51 may be accommodated within the sink 225, or the surface of the valve plate 51 facing away from the transition piece 52 may be provided within the sink 225, or it may be flush with the second side 224 of the first yoke plate 22, or it may protrude from the second side 224 of the first yoke plate 22.

[0093] As shown in Fig. 13, Fig. 13 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in an eighth embodiment of the present invention. The eighth embodiment is the same as the above embodiments, except for the shape of the transition piece 52.

[0094] Specifically, one end of the transition piece 52 is connected to the first yoke plate 22 via a flange 522 , and the other end is connected to the valve plate 51 .

[0095] As shown in Fig. 14, Fig. 14 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a ninth embodiment of the present invention. The ninth embodiment is the same as the above embodiments, except for the shape of the transition piece 52.

[0096] Specifically, the transition piece 52 has a straight structure without a flange. Both ends of the straight transition piece 52 are connected to the first yoke plate 22 and the valve plate 51, respectively.

[0097] In addition, when the valve plate 51 and the first yoke plate 22 are provided separately, the valve plate 51 may be provided on the first side surface 223 of the first yoke plate 22 connected to the insulating cover 21, or on the second side surface 224 of the first yoke plate connected to the metal cover 23. When the valve plate 51 is provided on the first side surface 223 of the first yoke plate 22, the first yoke plate 22 can provide a supporting force to the valve plate 51, and the gas pressure in the contact chamber can be applied to the first side surface 511 of the valve plate 51 to press the valve plate 51 against the first yoke plate 22. When the valve plate 51 is provided on the second side surface 224 of the first yoke plate 22, the first yoke plate 22 cannot provide a supporting force to the valve plate 51, so that a higher requirement is placed on the connection method between the valve plate 51 and the first yoke plate 22.

[0098] As shown in Fig. 15, Fig. 15 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a tenth embodiment of the present invention. The same points as those in the tenth embodiment and the above-mentioned fifth embodiment are omitted, but the differences are as follows: The sink 225 has a large depth, such that after the valve plate 51 is connected to the first yoke plate 22 via the transition piece 52, the first side surface 511 of the valve plate 51 is lower than the first side surface 223 of the first yoke plate 22. In other words, the valve plate 51 and the transition piece 52 are completely housed within the sink 225.

[0099] As shown in Fig. 16, Fig. 16 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in the eleventh embodiment of the present invention. The same points as those in the eleventh embodiment and the tenth embodiment are omitted, but the differences are as follows: One end of the transition piece 52 is connected to the valve plate 51 via a flange 522 , and the other end is connected to the first yoke plate 22 .

[0100] As shown in Fig. 17, Fig. 17 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in the twelfth embodiment of the present invention. The same points as those in the twelfth embodiment and the eleventh embodiment are omitted, but the differences are as follows: The transition piece 52 has a straight structure without being provided with a flange. The first yoke plate 22 and the valve plate 51 are connected to both ends of the transition piece 52 having the straight structure, respectively.

[0101] Of course, it will be understood that in the seventh to twelfth embodiments described above, the valve plate 51 may be directly connected to the first yoke plate 22 without the transition piece 52 therebetween.

[0102] As shown in Fig. 18, Fig. 18 is a cross-sectional view of a pressure relief valve assembly and a first yoke plate in a thirteenth embodiment of the present invention. The same points as those in the thirteenth embodiment and the above-mentioned embodiments are omitted, but the difference is that both side surfaces of the valve plate 51 are not flat, and may be, for example, wavy or curved.

[0103] The valve plate 51 may be connected to the first yoke plate 22 via a transition piece 52 or may be connected directly to the first yoke plate 22 .

[0104] 3 and 19, Fig. 3 is a schematic diagram showing a gas vent passage 6 in an embodiment of the present invention provided in a coil bobbin 411, and Fig. 19 is a schematic diagram showing a gas vent passage 6 in an embodiment of the present invention provided in a first yoke plate 22. A gas vent passage 6 is further provided between the drive assembly 4 and the first yoke plate 22, and the gas vent passage 6 communicates with the pressure relief hole 221 and also communicates with the hollow chamber 14.

[0105] The gas vent passage 6 can play a role in accelerating gas discharge, and in an abnormal operating state, the gas in the contact chamber 27 can be quickly discharged through the pressure relief hole 221 and the gas vent passage 6, thereby reducing the air pressure in the contact chamber 27 in the shortest possible time and avoiding an explosion.

[0106] In one embodiment, the airflow direction of the gas vent passage 6 is perpendicular to the axis of the pressure relief hole 221. In this way, the gas discharged from the pressure relief hole 221 is directly injected onto the inner wall surface of the gas vent passage 6, and the gas pressure gradually decreases, preventing the housing 1 from being damaged due to excessive pressure.

[0107] The gas vent passage 6 is formed between the first yoke plate 22 and the coil bobbin 411. Specifically, the gas vent passage 6 is formed between the first yoke plate 22 and the first flange portion 4111.

[0108] The gas vent passage 6 may be provided in the first yoke plate 22 and / or the coil bobbin 411. For example, as shown in Fig. 19, the gas vent passage 6 is provided on the side of the first yoke plate 22 facing the coil bobbin 411, or as shown in Figs. 3 and 4, the gas vent passage 6 is provided on the side of the first flange portion 4111 facing the first yoke plate 22, or the gas vent passage 6 is provided on the side of the first yoke plate 22 facing the coil bobbin 411 and on the side of the first flange portion 4111 facing the first yoke plate 22.

[0109] As shown in Fig. 20, Fig. 20 is a schematic exploded view of a first embodiment of a housing 1 according to the present invention. The housing 1 according to the embodiment of the present invention includes a first case 11 and a second case 12, the second case 12 is detachably connected to the first case 11, and a vent structure 13 is provided in the first case 11 and / or the second case 12, and the vent structure 13 communicates with a hollow chamber 14.

[0110] By providing the gas venting structure 13, the housing 1 in the embodiment of the present invention has a non-sealed structure, and the gas enters the hollow chamber 14 of the housing 1 after being discharged from the inside of the contact chamber 27 through the pressure relief hole 221, and then is discharged to the outside of the housing 1 through the gas venting structure 13.

[0111] In addition, the housing 1 of the embodiment of the present invention can prevent the gaseous eruptions generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of release, thereby preventing contamination of other electronic components near the relay. Here, the gaseous eruptions are generated by the high-temperature arc ablation and volatilization of the metal material of the contact assembly 3.

[0112] 20, the gas venting structure 13 includes a slit 131, which is formed between the first case 11 and the second case 12. Gas can be discharged from the relay through the slit 131 between the first case 11 and the second case 12.

[0113] In this embodiment, the slit 131 is located at the bottom of the housing 1 .

[0114] As shown in Fig. 21, Fig. 21 is a schematic exploded view of a second embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the second embodiment and the housing 1 of the first embodiment are omitted, but the difference is that the slit 131 is located in the central region of the housing 1 in the height direction.

[0115] As shown in Fig. 22, Fig. 22 is a schematic exploded view of the third embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the third embodiment and the housing 1 of the second embodiment are omitted, but the difference is that the gas vent structure 13 has a slit 131 and a gas vent hole 132, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas vent hole 132 is formed in the second case 12. Gas can be discharged from the relay through the slit 131 and the gas vent hole 132. Of course, the gas vent hole 132 may be provided in the first case 11.

[0116] As shown in Fig. 23, Fig. 23 is a schematic diagram of an exploded view of a fourth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fourth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting cover 133, the slit 131 is formed in the central region in the height direction of the housing 1, the gas venting cover 133 is provided in the first case 11, and the opening of the gas venting cover 133 faces downward. In this way, gas can be discharged from the relay through the slit 131 and the gas venting cover 133, and the gas discharged from the gas venting cover 133 is ejected downward, and does not affect other electronic devices near the relay.

[0117] Of course, the gas vent cover 133 may be provided on the second case 12, or both the first case 11 and the second case 12 are provided with the gas vent cover 133.

[0118] As shown in Fig. 24, Fig. 24 is a schematic exploded view of the fifth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fifth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting grill 134, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas venting grill 134 is provided in the first case 11. Of course, the gas venting grill 134 may be provided in the second case 12, or both the first case 11 and the second case 12 are provided with the gas venting grill 134.

[0119] The gas can be exhausted from the relay through the slits 131 and the gas venting grill 134. When the gas passes through the gas venting grill 134, the gas venting grill 134 can make the gas flow more slowly, and can prevent the exhausted gas from affecting other electronic components near the relay.

[0120] In addition, various examples / embodiments provided by the present invention can be combined with each other without causing a contradiction, and will not be described herein with examples.

[0121] As described above, the advantages and beneficial effects of the relay according to the embodiments of the present invention include at least the following:

[0122] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the first yoke plate 22, which allows over-pressure gas to escape, and further ensures that even in an abnormal situation such as a short circuit or overload shutdown of the contact assembly, the relay will not explode and disintegrate the sealed chamber due to the rapid expansion of gas caused by the high temperature inside the contact chamber 27, thereby improving the reliability of the product.

[0123] In addition, the housing 1 of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the emitted gas in a timely manner and prevent the emitted gas from contaminating other electronic devices.

[0124] Furthermore, referring to Figs. 25-50, the embodiments of the present invention provide a sealed contact unit and an electric element that can improve safety to solve the problem of explosion proneness existing in the related art.

[0125] A sealed contact unit in an embodiment of the present invention includes a sealed container, a contact assembly, and a pressure relief valve assembly, the sealed container having a sealed chamber and a pressure relief hole, the pressure relief hole penetrating a container wall of the sealed container and communicating with the sealed chamber, the contact assembly including a fixed contact part and a movable contact part, the movable contact part being disposed in the sealed chamber and movable to contact or separate from the fixed contact part, whereby the fixed contact part and the movable contact part realize turning on / off of the electric current, the pressure relief valve assembly being disposed in the container wall of the sealed container, being used to close the pressure relief hole when the gas pressure in the sealed container is lower than a certain threshold, and being broken through to open the pressure relief hole when the gas pressure in the sealed container is equal to or higher than a certain threshold.

[0126] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate, which is integrally mounted to the vessel wall and is used to close or open the pressure relief hole.

[0127] According to some embodiments of the present invention, the vessel wall has an inner wall surface and an outer wall surface, and the valve plate has opposed first and second sides; A first side of the valve plate is connected to a hole wall of the pressure relief hole, and a second side of the valve plate is flush with the outer wall surface.

[0128] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate that is separate from the vessel wall, is mounted to the pressure relief hole, and is used to close or open the pressure relief hole.

[0129] According to some embodiments of the invention, the vessel wall has an inner wall surface and an outer wall surface, and the valve plate is disposed on the inner wall surface and / or the outer wall surface.

[0130] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the vessel wall via the transition piece.

[0131] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a protective cover, the protective cover being connected to the vessel wall and covering an outer surface of the valve plate, the protective cover having an air vent.

[0132] According to some embodiments of the present invention, the structural strength of the pressure relief valve assembly is less than the structural strength of the sealed vessel.

[0133] An electric element in an embodiment of the present invention comprises the above-mentioned sealed contact unit.

[0134] According to some embodiments of the present invention, the electrical element further comprises a housing, the housing having a hollow chamber; Both the sealed container of the sealed contact unit and the pressure relief valve assembly are located within the hollow chamber.

[0135] According to some embodiments of the present invention, the housing comprises a first case and a second case; A second case is detachably connected to the first case, and a vent structure is provided in the first case and / or the second case, and the vent structure communicates with the hollow chamber.

[0136] According to some embodiments of the present invention, the venting structure comprises a slit, the slit being formed between the first case and the second case.

[0137] According to some embodiments of the present invention, the venting structure comprises a vent hole and / or a vent cover and / or a vent grill.

[0138] According to some embodiments of the invention, the hollow chamber communicates with the exterior of the housing.

[0139] According to some embodiments of the present invention, the electrical element is a relay.

[0140] According to some embodiments of the present invention, the sealed container of the sealed contact unit includes a first yoke plate, an insulating cover, and a metal cover; the first yoke plate has a first side surface and a second side surface provided on opposite sides, and a through hole, the through hole passing through the first side surface and the second side surface; an insulating cover connected to the first side surface and covering the through hole; a metal cover connected to the second side surface and covering the through hole; Here, the pressure relief hole is provided in the insulating cover and / or the metal cover.

[0141] According to some embodiments of the present invention, the pressure relief valve assembly is mounted on the insulating cover, the insulating cover comprising a ceramic cover and a connecting piece; The fixed contact part is provided on the ceramic cover, One end of the connection part is connected to an opening edge of the ceramic cover, and the other end is connected to the first side surface, Here, the pressure relief hole is provided in the ceramic cover and / or the connecting part.

[0142] According to some embodiments of the present invention, the ceramic cover comprises a top wall and a first side wall; The fixed contact element is provided on the top wall, One end of the first side wall is connected to an edge of the top wall, and the other end extends toward the first yoke plate and is connected to the connection part; Here, the pressure relief hole is provided in the top wall and / or the first side wall.

[0143] According to some embodiments of the present invention, the pressure relief valve assembly is disposed in the metal cover, the metal cover having a bottom wall and a second side wall; One end of the second side wall is connected to an edge of the bottom wall, and the other end extends toward the first yoke plate and is connected to the second side surface; The bottom wall is provided with the pressure relief hole.

[0144] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0145] The sealed contact unit in the embodiment of the present invention is used to release over-pressure gas by providing a pressure relief valve assembly in the sealed container. Furthermore, under abnormal circumstances such as short circuit or overload shutdown of the contact assembly, the sealed contact unit ensures that the high temperature inside the chamber will not cause a sudden expansion of gas, resulting in explosive disintegration of the chamber, thereby improving the reliability of the product.

[0146] Moreover, the housing of the electric components in the embodiment of the present invention is designed as a non-sealed structure, which can exhaust the released gas in a timely manner and avoid the release from causing pollution to other electronic devices.

[0147] As described in the Background Art, in the relay contact system of the related art, at the moment of high current short circuit or overload cutoff, the contact sealing cavity is prone to explosion, which is a safety hazard. The inventors have found in their research that when the contact inside the contact sealing cavity suddenly burns with an arc, high temperature is instantaneously generated inside the sealing cavity, which causes the air pressure inside the contact sealing cavity to instantly and rapidly rise, and when the air pressure strength inside the contact sealing cavity is greater than the strength of the components or the strength of the connection points of the contact sealing cavity, the contact sealing cavity of the relay is prone to explosion.

[0148] The sealed contact unit in the embodiment of the present invention includes a sealed container, a contact assembly, and a pressure relief valve assembly, the sealed container includes a sealed chamber and a pressure relief hole, the pressure relief hole penetrates a container wall of the sealed container and communicates with the sealed chamber, the contact assembly includes a fixed contact part and a movable contact part, the movable contact part is provided in the sealed chamber and configured to move to contact or separate from the fixed contact part, so that the fixed contact part and the movable contact part realize turning on and off of the electric current, the pressure relief valve assembly is provided in the container wall of the sealed container and is used to close the pressure relief hole when the gas pressure in the sealed container is lower than a certain threshold, and is used to break through and open the pressure relief hole when the gas pressure in the sealed container is equal to or higher than a certain threshold.

[0149] In addition, the sealed contact unit of the present invention can be applied to an electric element capable of realizing contact or separation of contacts, and the electric element includes, but is not limited to, a relay, a contactor, a vacuum arc-extinguishing chamber, etc. For convenience of explanation, the electric element will be described below as an example of a relay, but this should not be considered as a limitation.

[0150] As shown in Fig. 25 and Fig. 26, Fig. 25 is a top view of a relay in an embodiment of the present invention. Fig. 26 is a cross-sectional view of CC in Fig. 25. The relay in the embodiment of the present invention includes a housing 1, a sealed container 2, a contact assembly 3, a drive assembly 4, and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, and the hollow chamber 14 communicates with the outside of the housing 1. The sealed container 2 is provided in the hollow chamber 14, and the sealed container 2 includes a sealed chamber and a pressure relief hole 221, and the pressure relief hole 221 penetrates the container wall of the sealed container 2 and communicates with the hollow chamber 14 and the sealed chamber. The contact assembly 3 includes a fixed contact part 31 and a movable contact part 32, and the fixed contact part 31 is provided in the container wall, and one end of the fixed contact part 31 enters the sealed chamber and the other end is exposed from the outer surface of the housing 1. The movable contact part 32 is provided in the sealed chamber. The driving assembly 4 is provided in the hollow chamber 14, connected to the movable contact piece 32, and is used to drive the movement of the movable contact piece 32 to realize contact or separation between both ends of the movable contact piece 32 and the fixed contact piece 31. The pressure relief valve assembly 5 is provided in the container wall of the sealed container 2, and closes the pressure relief hole 221 when the gas pressure in the sealed chamber is lower than a certain threshold, and breaks through to open the pressure relief hole 221 when the gas pressure in the sealed chamber is equal to or higher than a certain threshold. The structural strength of the pressure relief valve assembly 5 is smaller than that of the sealed container 2, and in a normal operating state, the maximum value of the intensity of the gas pressure in the sealed chamber is smaller than the structural strength of the pressure relief valve assembly 5, and in an abnormal operating state, the maximum value of the intensity of the gas pressure in the sealed chamber is greater than the structural strength of the pressure relief valve assembly 5. Note that when the pressure relief valve assembly 5 closes the pressure relief hole 221, it maintains the sealing of the sealed chamber and ensures the normal operation of the relay.

[0151] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the container wall of the sealed container 2 to close or open the pressure relief hole 221. When the contact assembly 3 is in a normal operating state, the intensity of the gas pressure in the sealed chamber is less than the threshold, so that the pressure relief valve assembly 5 is not broken by the atmospheric pressure in the sealed chamber, and still maintains the pressure relief hole 221 in a closed state, so that the sealed chamber can maintain sealing. When the contact assembly 3 is in an abnormal operating state, the intensity of the gas pressure in the sealed chamber is equal to or greater than the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the sealed chamber, so that the sealed chamber communicates with the hollow chamber 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the sealed chamber can be released to the hollow chamber 14 through the pressure relief hole 221, and finally released to the outside of the housing 1. That is, in the process of the gradual increase in the intensity of the gas pressure in the sealed chamber under abnormal operating conditions, the gas pressure first breaks through the pressure relief valve assembly 5, and then the suddenly increased gas pressure is released through the pressure relief hole 221, so that the air pressure inside the sealed chamber does not continue to rise and does not reach the structural strength of the sealed chamber, thereby avoiding the explosion of the sealed chamber. Under normal operating conditions, the gas pressure in the sealed chamber does not break through the pressure relief valve assembly 5, and the pressure relief valve assembly 5 can still play the role of sealing the pressure relief hole 221.

[0152] The term "normal operating state" means that the relay current is in the rated operating state, and the term "abnormal operating state" means that the contact assembly 3 is in a moment of high current short circuit, or an overload interruption, etc. The term "threshold" refers to a pressure strength that is slightly larger than the strength of the gas pressure in the sealed container 2 when the relay is in a normal operating state. Depending on the model of the relay, the threshold value is also suitable for adjustment, but cannot be larger than the structural strength of the sealed container 2.

[0153] That is, when the relay is operating normally, the pressure in the sealed container 2 does not reach this threshold and the pressure relief valve assembly 5 is not breached. When the relay is in an abnormal operating state, the pressure in the sealed container 2 is equal to or greater than this threshold and the pressure relief valve assembly 5 is breached by the gas.

[0154] In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the sealed container 2. Thus, when the relay is in an abnormal operating state and the gas pressure in the sealed container 2 gradually increases, the pressure relief valve assembly 5 is pierced by the gas before the sealed container 2 is pierced.

[0155] In addition, the design of the pressure relief valve assembly 5 to have a structural strength smaller than that of the sealed container 2 can be achieved by using different materials and / or structures of the two. For example, when the material of the pressure relief valve assembly 5 and the container wall of the sealed container 2 are the same, the thickness of the pressure relief valve assembly 5 can be designed to be thin and smaller than that of the container wall of the sealed container 2, and thus the gas with a gradually increasing temperature will break through the pressure relief valve assembly 5 first. Of course, when the thickness of the container wall of the pressure relief valve assembly 5 and the container wall of the sealed container 2 are the same, the pressure relief valve assembly 5 can be made of ceramic, while the sealed container 2 can be made of metal, and similarly, the pressure relief valve assembly 5 will be broken through first. Or, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall of the sealed container 2 is thick and made of metal. Of course, other suitable methods can be adopted to make the structural strength of the pressure relief valve assembly 5 smaller than that of the sealed container 2, and they will not be listed here.

[0156] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or assemblies inherent to those processes, methods, products or devices.

[0157] In addition, the relay according to the embodiment of the present invention does not include the housing 1, and after assembling the sealed container 2, the contact assembly 3, the drive assembly 4, and the pressure relief valve assembly 5, the relay may be directly installed in an application product such as a battery pack, an electrical control box, etc.

[0158] Next, referring to FIG. 25-FIG. 26, the contact assembly 3 includes a fixed contact part 31 and a movable contact part 32 as current inflow and current outflow, respectively. The movable contact part 32 may be a straight piece, and both ends of the movable contact part 32 can contact the two fixed contact parts 31 along the longitudinal direction of the movable contact part 32 by the action of the drive assembly 4, so that the fixed contact part 31 and the movable contact part 32 can realize the current ON. When the fixed contact part 31 is separated from the movable contact part 32, the current of both is OFF. The bottom of the fixed contact part 31 can be a fixed contact, and both ends of the movable contact part 32 in the longitudinal direction can be movable contacts. The movable contacts at both ends of the movable contact part 32 may protrude from other parts of the movable contact part 32, or may be flush with other parts.

[0159] The fixed contact may be provided integrally or separately at the bottom of the fixed contact component 31, and the movable contact may be provided integrally or separately at both ends of the movable contact component 32 in the extending longitudinal direction.

[0160] Two fixed contact pieces 31 are provided in the sealed container 2, for example, on the top of the sealed container 2. One end of each fixed contact piece 31 enters the inside of the sealed chamber, and the other end is exposed from the outer surface of the housing 1. The one end of each fixed contact piece 31 that enters the inside of the sealed chamber is used to contact the movable contact piece 32.

[0161] The relay also comprises an arc-extinguishing unit 7 mounted in the hollow chamber 14 of the housing 1 for extinguishing the arc of the contact assembly 3 .

[0162] In this embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The arc-extinguishing magnets 71 may be permanent magnets, and each of the arc-extinguishing magnets 71 may be substantially rectangular. The two arc-extinguishing magnets 71 are provided on both sides of the sealed container 2, respectively, and are provided facing each other along the longitudinal direction of the movable contact part 32.

[0163] 26, the two arc-extinguishing magnets 71 are located on both the left and right sides of the sealed container 2. In this embodiment, the polarities of the opposing faces of the two arc-extinguishing magnets 71 are opposite. That is, the left face of the arc-extinguishing magnet 71 located on the left side of the sealed container 2 is an S pole and the right face is an N pole, and the left face of the arc-extinguishing magnet 71 located on the right side of the sealed container 2 is an S pole and the right face is an N pole.

[0164] Of course, the polarities of the opposing surfaces of the two arc-extinguishing magnets 71 can also be designed to be the same; for example, the left surface of the arc-extinguishing magnet 71 located on the left side of the insulating cover 21 has a south pole and the right surface has a north pole, and the left surface of the arc-extinguishing magnet 71 located on the right side of the insulating cover 21 has a north pole and the right surface has a south pole.

[0165] In this way, by providing two arc-extinguishing magnets 71 facing each other, a magnetic field can be formed around the contact assembly 3. Therefore, no matter in which direction the arc generated between the fixed contact part 31 and the movable contact part 32 faces, the arc is stretched away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0166] The arc-extinguishing unit 7 further includes two yoke clips 72 arranged corresponding to the positions of the two arc-extinguishing magnets 71. The two yoke clips 72 surround the sealed container 2 and the two arc-extinguishing magnets 71. The design of the yoke clips 72 surrounding the arc-extinguishing magnets 71 can prevent the magnetic field generated by the arc-extinguishing magnets 71 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clips 72 are made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0167] The sealed container 2 comprises a first yoke plate 22, an insulating cover 21, and a metal cover 23, and the first yoke plate 22 is provided within the hollow chamber 14 and has a first side 223 and a second side 224 provided on opposite sides, and a through hole 222, and the through hole 222 penetrates the first side 223 and the second side 224.

[0168] The insulating cover 21 is connected to the first side surface 223 and covers the through hole 222. The insulating cover 21 and the first yoke plate 22 form a contact chamber 27, which communicates with the through hole 222 and is used to accommodate the fixed contact component 31 and the movable contact component 32.

[0169] The metal cover 23 is connected to the second side 224 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 constitute a driving chamber 24, which communicates with the through hole 222, and is used to accommodate the fixed iron core 413 and the movable iron core 414, as described below. The contact chamber 27 and the driving chamber 24 communicate with each other via the through hole 222, and the contact chamber 27 and the driving chamber 24 jointly form the sealed chamber.

[0170] Here, the pressure relief valve assembly 5 may be provided on the insulating cover 21, or on the metal cover 23, or both the insulating cover 21 and the metal cover 23 are provided with the pressure relief valve assembly 5.

[0171] The insulating cover 21 may include a ceramic cover 211 and a connecting part 212, and two fixed contact parts 31 are provided on the ceramic cover 211. The ceramic cover 211 is connected to the first yoke plate 22 through the connecting part 212. Specifically, the connecting part 212 may be an annular structure, and one end of the connecting part 212 may be connected to the opening edge of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesion, etc. The other end of the connecting part 212 is connected to the first side surface 223 of the first yoke plate 22, and may also be connected by laser welding, brazing, resistance welding, adhesion, etc. The connecting part 212 is provided between the ceramic cover 211 and the first yoke plate 22, which can facilitate the connection between the ceramic cover 211 and the first yoke plate 22.

[0172] 26, the drive assembly 4 includes an electromagnet unit 41 and a push rod unit 42. The electromagnet unit 41 is disposed on a side of the first yoke plate 22 away from the insulating cover 21. The push rod unit 42 is drivingly connected to the electromagnet unit 41. The push rod unit 42 is movably provided in the drive chamber 24 and connected to the movable contact part 32 through the through hole 222.

[0173] When the electromagnet unit 41 is energized, it can drive the push rod unit 42 to move, which can in turn move the movable contact piece 32 into or out of contact with the fixed contact piece 31 .

[0174] The electromagnet unit 41 includes a coil bobbin 411, a coil 412, a fixed core 413, and a movable core 414. The coil bobbin 411 is hollow and made of an insulating material. The metal cover 23 is provided in the coil bobbin 411. The coil 412 surrounds the coil bobbin 411. The fixed core 413 is fixed in the metal cover 23, and a part of the fixed core 413 enters the through hole 222. The fixed core 413 has a first hole 4131 provided in correspondence with the position of the through hole 222 for the push rod unit 42 to be provided. The movable core 414 is provided movably in the metal cover 23 and is provided opposite the fixed core 413. The movable core 414 is connected to the push rod unit 42, and is used to be attracted to the fixed core 413 when the coil 412 is energized. The armature 414 and the push rod unit 42 may be connected by threads, caulking, welding, or other methods.

[0175] In this embodiment, the coil bobbin 411 is made of a resin material and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are provided on both ends of the hollow cylindrical portion 4112. The coil 412 surrounds the outer periphery of the hollow cylindrical portion 4112. The metal cover 23 is drilled into the hollow cylindrical portion 4112.

[0176] The electromagnet unit 41 further includes a first elastic part 415, which is located inside the metal cover 23 and disposed between the fixed core 413 and the movable core 414, and is used to reset the movable core 414 when the power supply to the coil 412 is cut off. The first elastic part 415 may be a spring, and may be sleeved on the outside of the push rod unit 42.

[0177] The relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 and the first yoke plate 22 are provided opposite to each other, and the coil bobbin 411 is provided between the first yoke plate 22 and the second yoke plate 25. That is, the first yoke plate 22 is connected to a first flange portion 4111 of the coil bobbin 411, and the second yoke plate 25 is connected to a second flange portion 4113 of the coil bobbin 411.

[0178] A pair of third yoke plates 26 are respectively provided at both ends along the longitudinal direction of the movable contact part 32 of the second yoke plate 25, extend in the direction of the first yoke plate 22, and are connected to both ends along the longitudinal direction of the movable contact part 32 of the first yoke plate 22.

[0179] In this manner, the first yoke plate 22 , the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412 .

[0180] The second yoke plate 25 and the pair of third yoke plates 26 can be formed as an integral structure by, for example, bending. The second yoke plate 25 formed integrally with the first yoke plate 22 and the pair of third yoke plates 26 may be formed as separate structures.

[0181] The relay also includes a magnetically conductive bushing 416 made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof. The magnetically conductive bushing 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the coil bobbin 411 and the outer peripheral surface of the metal cover 23. In this manner, the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the fixed core 413, the movable core 414, and the magnetically conductive bushing 416 together form a magnetic path.

[0182] 2 and 4, the push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixed sheet 427, a push rod 423, a second elastic part 424, a first magnetic conductive body 425, and a second magnetic conductive body 426. The first magnetic conductive body 425 is fixedly connected to the U-shaped bracket 421, and the first magnetic conductive body 425 is provided on the inner surface of the U-shaped bracket 421. The second magnetic conductive body 426 is fixedly connected to the movable contact part 32. The base 422, the fixed sheet 427, and the upper part of the push rod 423 can be integrally molded by injection molding.

[0183] The bottom of the U-shaped bracket 421 is fixedly connected to the fixed sheet 427, the U-shaped bracket 421 and the base 422 are surrounded by a frame structure, and the movable contact part 32, the first magnetic conductive body 425 and the second magnetic conductive body 426 are attached in the frame structure surrounded by the U-shaped bracket 421 and the base 422. In addition, the second elastic part 424 is also provided in the frame structure surrounded by the U-shaped bracket 421 and the base 422, one end of the second elastic part 424 abuts on the base 422 and the other end abuts on the movable contact part 32, and the second elastic part 424 can provide an elastic force so that the movable contact part 32 and the second magnetic conductive body 426 tend to move away from the base 422 and approach the first magnetic conductive body 425. The push rod 423 is inserted into the through hole 222 of the first yoke plate 22 and the first hole 4131 of the fixed core 413, and one end of the push rod 423 is fixedly connected to the base 422 and the other end of the push rod 423 is fixedly connected to the movable core 414.

[0184] It should be noted that a spring may be used as the second elastic part 424. The first magnetic conductive body 425 and the second magnetic conductive body 426 may be made of a soft magnetic material such as iron, cobalt, nickel, or an alloy thereof.

[0185] When the push rod 423 is not moving upward, the top surface of the movable contact part 32 abuts against the first magnetic conductive body 425 under the action of the second elastic part 424. When the coil 412 is energized and the push rod 423 is driven to move upward, both ends of the movable contact part 32 contact the two fixed contact parts 31 respectively. After that, the push rod 423 continues to move upward, and the first magnetic conductive body 425 also continues to move upward following the push rod 423, but since the movable contact part 32 has already contacted the two fixed contact parts 31, the movable contact part 32 cannot continue to move upward, realizing the overtravel of the contact. The elastic force from the second elastic part 424 forms a certain gap between the bottom surface of the first magnetic conductive body 425 and the top surface of the movable contact part 32, thereby causing a magnetic gap to exist between the first magnetic conductive body 425 and the second magnetic conductive body 426.

[0186] As shown in Fig. 27, Fig. 27 is a schematic diagram of an exploded view of a relay in an embodiment of the present invention, in which the pressure relief valve assembly 5 is provided in the insulating cover 21. Specifically, the pressure relief valve assembly 5 is provided in the ceramic cover 211.

[0187] In one embodiment, the pressure relief valve assembly 5 includes a valve plate 51, which is provided separately from the sealed container 2, is provided on the container wall, and is used to close or open the pressure relief hole 221. Specifically, the valve plate 51 is provided on the ceramic cover 211.

[0188] The structural strength of the valve plate 51 is smaller than that of the sealed container 2. When the contact assembly 3 is in an abnormal operating state, the gas whose pressure increases suddenly breaks through the valve plate 51 first and is discharged from the pressure relief hole 221 of the sealed chamber, so that the gas pressure in the sealed chamber does not continue to increase and the sealed chamber is protected.

[0189] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0190] As shown in FIG. 28, FIG. 28 is a cross-sectional view of the insulating cover 21 and the valve plate 51 after assembly in the first embodiment of the present invention. In this embodiment, the insulating cover 21 includes a ceramic cover 211 and a connection part 212, the ceramic cover 211 includes a top wall 2111 and a first side wall 2112, the fixed contact part 31 is provided on the top wall 2111, and the pressure relief hole 221 is provided on the top wall 2111. One end of the first side wall 2112 is connected to the edge of the top wall 2111, and the other end extends toward the first yoke plate 22 and is connected to the connection part 212. The valve plate 51 is provided on the top wall 2111 and covers the pressure relief hole 221.

[0191] The valve plate 51 may be provided on the inner wall surface of the ceramic cover 211 or on the outer wall surface of the ceramic cover 211 .

[0192] It should be noted that the valve plate 51 can be connected to the first side wall 2112 of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesives, or the like.

[0193] The advantage of installing the valve plate 51 on the ceramic cover 211 is that ceramic has the characteristics of high strength and high hardness, which provides a stable and reliable base for the valve plate 51, so that the valve plate 51 will not be easily distorted by the deformation of the ceramic cover 211, and premature failure of the valve plate 51 can be avoided.

[0194] As shown in Fig. 29, Fig. 29 is a cross-sectional view of the insulating cover 21 and the valve plate 51 in the second embodiment of the present invention after assembly. The same points as those in the second embodiment and the above embodiments are omitted, but the difference is that the pressure relief valve assembly 5 further includes a transition piece 52, and the valve plate 51 is connected to the ceramic cover 211 through the transition piece 52.

[0195] In this embodiment, the transition piece 52 may be a sheet body.

[0196] The transition piece 52 has a second perforation 521 opening in the thickness direction, and the second perforation 521 communicates with the pressure relief hole 221. The valve plate 51 is connected to the transition piece 52 and covers the second perforation 521. In a normal operating state, the valve plate 51 closes the second perforation 521 and the pressure relief hole 221 to keep the contact chamber 27 sealed. In an abnormal operating state, the valve plate 51 is broken by the gas, and the contact chamber 27 communicates with the outside through the second perforation 521 and the pressure relief hole 221.

[0197] The connection between the valve plate 51 and the transition piece 52, and between the transition piece 52 and the ceramic cover 211 can be made by laser welding, brazing, resistance welding, adhesive bonding, or the like.

[0198] In this embodiment, the valve plate 51 and the transition piece 52 are both provided on the outer wall surface of the ceramic cover 211. Of course, in other embodiments, the valve plate 51 and the transition piece 52 may be provided on the inner wall surface of the ceramic cover 211.

[0199] As shown in Fig. 30 to Fig. 32, Fig. 30 is a cross-sectional view of insulating cover 21 and valve plate 51 after assembly in a third embodiment of the present invention. Fig. 31 is a cross-sectional view of insulating cover 21 and valve plate 51 after assembly in a fourth embodiment of the present invention. Fig. 32 is a cross-sectional view of insulating cover 21 and valve plate 51 after assembly in a fifth embodiment of the present invention.

[0200] The points which are the same as the second embodiment and the third to fifth embodiments are omitted, but the difference is the shape of the transition piece 52.

[0201] Specifically, the transition piece 52 in the third embodiment has a substantially tubular shape, for example, a cylindrical shape. A flange 522 protruding outward along a radial direction is provided at one end of the transition piece 52. The one end of the transition piece 52 is connected to the ceramic cover 211 via the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51.

[0202] The transition piece 52 in the fourth embodiment has a generally cylindrical shape, where one end of the transition piece 52 is connected to the valve plate 51 via a flange 522 and the other end is connected to the ceramic cover 211 .

[0203] The transition piece 52 in the fifth embodiment has a straight structure without a flange. Both ends of the straight transition piece 52 are connected to the ceramic cover 211 and the valve plate 51, respectively.

[0204] As shown in Figures 33 and 34, Figure 33 is a perspective view of the insulating cover 21 and the valve plate 51 after assembly in the sixth embodiment of the present invention. Figure 34 is a perspective view of the insulating cover 21 and the valve plate 51 after assembly in the seventh embodiment of the present invention. The same points as those in the sixth and seventh embodiments and the above embodiments will be omitted, but the difference is that the pressure relief valve assembly 5 is provided in the first side wall 2112 of the ceramic cover 211.

[0205] In this embodiment, the first side wall 2112 of the ceramic cover 211 forms a substantially rectangular parallelepiped structure, where the pressure relief valve assembly 5 may be provided on a long side of the rectangular parallelepiped structure (FIG. 33) or on a wide side of the rectangular parallelepiped structure (FIG. 34).

[0206] As shown in Figures 35 and 36, Figure 35 is a cross-sectional view of the insulating cover 21 and the valve plate 51 after assembly in the eighth embodiment of the present invention. Figure 36 is an enlarged view of a part of the B portion in Figure 35. The same points as those in the eighth embodiment and the above embodiments are omitted, but the difference is that the pressure relief valve assembly 5 is provided in the connection part 212.

[0207] Specifically, the pressure relief hole 221 is provided in the connecting part 212. The pressure relief valve assembly 5 includes a valve plate 51, which is integrally provided in the pressure relief hole 221 of the connecting part 212 and is used to close or open the pressure relief hole 221.

[0208] As shown in Fig. 37, Fig. 37 is a cross-sectional view of the insulating cover 21 and the valve plate 51 according to the ninth embodiment of the present invention after assembly. Points that are the same as those in the ninth embodiment and the eighth embodiment will be omitted, but the difference is that the valve plate 51 is provided separately from the connection part 212 and covers the pressure relief hole 221.

[0209] The valve plate 51 may be directly connected to the connection part 212, or may be connected to the connection part 212 via a transition piece 52. The valve plate 51 may be provided on an inner wall surface of the connection part 212, or may be provided on an outer wall surface of the connection part 212.

[0210] Hereinafter, different ways in which the pressure relief valve assembly 5 is mounted on the metal cover 23 will be described with reference to FIGS.

[0211] As shown in Fig. 38, Fig. 38 is a cross-sectional view of the first embodiment of the present invention after the metal cover 23 and the valve plate 51 are assembled. The metal cover 23 includes a bottom wall 231 and a second side wall 232, one end of which is connected to the edge of the bottom wall 231 and the other end of which extends toward the first yoke plate 22 and is connected to the second side surface 224 of the first yoke plate 22. The pressure relief valve assembly 5 is provided on the bottom wall 231.

[0212] Specifically, a pressure relief hole 221 is provided in the bottom wall 231 of the metal cover 23. The pressure relief valve assembly 5 includes a valve plate 51, which is connected to the bottom wall 231 and covers the pressure relief hole 221. When the valve plate 51 is not broken through (i.e., in a normal operating state), the valve plate 51 plays a sealing role. When the valve plate 51 is broken through (i.e., in an abnormal operating state), the gas in the driving chamber 24 can be released through the pressure relief hole 221.

[0213] The structural strength of the valve plate 51 is smaller than that of the sealed container. When the contact assembly 3 is in an abnormal operating state, the gas whose pressure increases suddenly breaks through the valve plate 51 first and is discharged from the pressure relief hole 221 of the sealed chamber, so that the gas pressure in the contact chamber 27 does not continue to increase, and the sealed chamber is protected.

[0214] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0215] 38, the valve plate 51 is connected to the inner wall surface of the bottom wall 231 and covers the pressure relief hole 221. The valve plate 51 can be connected to the inner wall surface of the bottom wall 231 by a method such as laser welding, brazing, resistance welding, or adhesive.

[0216] As shown in Fig. 39, Fig. 39 is a cross-sectional view of the second embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as the first embodiment will be omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 and covers the pressure relief hole 221.

[0217] As shown in Fig. 40, Fig. 40 is a cross-sectional view of the third embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those of the third embodiment and the above embodiments are omitted, but the difference is that the valve plate 51 is connected to the inner wall surface of the bottom wall 231 via a transition piece 52.

[0218] Specifically, the transition piece 52 has a generally tubular shape, for example, a cylindrical shape. A flange 522 protruding outward along the radial direction is provided at one end of the transition piece 52. The one end of the transition piece 52 is connected to the inner wall surface of the bottom wall 231 via the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51.

[0219] Of course, one end of the transition piece 52 may be connected to the valve plate 51 via a flange 522, and the other end may be connected to the inner wall surface of the bottom wall 231. Alternatively, the transition piece 52 may have a straight structure without a flange. Both ends of the straight transition piece 52 are connected to the bottom wall 231 and the valve plate 51, respectively.

[0220] In addition, the connection between the valve plate 51 and the transition piece 52, and between the transition piece 52 and the bottom wall 231 can be made by laser welding, brazing, resistance welding, adhesives, or the like.

[0221] As shown in Fig. 41, Fig. 41 is a cross-sectional view of the fourth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those in the fourth embodiment and the third embodiment are omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 via a transition piece 52.

[0222] As shown in Fig. 42, Fig. 42 is a cross-sectional view of the fifth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those of the fifth embodiment and the third embodiment are omitted, but the difference is that the transition piece 52 is one piece, the transition piece 52 has a second perforation 521, and the second perforation 521 is provided corresponding to the pressure relief hole 221.

[0223] As shown in Fig. 43, Fig. 43 is a cross-sectional view of the sixth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those in the sixth embodiment and the fifth embodiment are omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 via a transition piece 52.

[0224] When the valve plate 51 is provided separately from the bottom wall 231 of the metal cover 23, the valve plate 51 may be provided on the inner wall surface of the bottom wall 231 or on the outer wall surface of the bottom wall 231. When the valve plate 51 is provided on the inner wall surface of the bottom wall 231, the bottom wall 231 provides a supporting force to the valve plate 51, and the gas pressure inside the sealed container 2 can be applied to the first side surface 511 of the valve plate 51 to press the valve plate 51 against the bottom wall 231. When the valve plate 51 is provided on the outer wall surface of the bottom wall 231, the bottom wall 231 cannot provide a supporting force to the valve plate 51, so higher requirements are placed on the method of connecting the valve plate 51 and the bottom wall 231.

[0225] As shown in Fig. 44, Fig. 44 is a cross-sectional view of the seventh embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those of the seventh embodiment and the above embodiments are omitted, but the difference is that the valve plate 51 is integrally provided on the bottom wall 231 and is used to close or open the pressure relief hole 221.

[0226] Specifically, the bottom wall 231 has an inner wall surface and an outer wall surface, and the valve plate 51 has a first side surface 511 and a second side surface 512 provided on opposite sides. The first side surface 511 is connected to the hole wall of the pressure relief hole 221, and the second side surface 512 is flush with the outer wall surface.

[0227] Of course, the positional relationship between the bottom wall 231 and both side surfaces of the valve plate 21 is such that the first side surface 511 of the valve plate 51 is flush with the inner wall surface of the bottom wall 231 and the second side surface 512 is connected to the hole wall of the pressure relief hole 221, or the first side surface 511 and the inner wall surface of the bottom wall 231 are spaced a fixed distance apart, and the second side surface 512 and the outer wall surface of the bottom wall 231 are spaced a fixed distance apart.

[0228] As shown in Fig. 45, Fig. 45 is a cross-sectional view of a protective cover 53 attached to a vessel wall in an embodiment of the present invention. The pressure relief valve assembly 5 further includes a protective cover 53, which is connected to the vessel wall of the sealed vessel 2 and is provided to cover the outer surface of the valve plate 51. The protective cover 53 has a vent hole 531, and gas can act on the valve plate 51 through the vent hole 531.

[0229] The protective cover 53 may be connected to the ceramic cover 211, the connection part 212, or the metal cover 23. Furthermore, the protective cover 53 may be provided on the outer wall surface 282 of the sealed container 2.

[0230] In this embodiment, by adding a protective cover 53, it is possible to prevent gas from breaking through the valve plate 51 in an abnormal operating state, and to protect the valve plate 51 during transportation or installation of the sealed container 2, thereby preventing the valve plate 51 from being broken through by external objects.

[0231] The protective cover 53 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, etc.

[0232] The protective cover 53 can be connected to the sealed container 2 by a method such as laser welding, brazing, resistance welding, adhesion, or locking. As shown in Figure 46, Figure 46 is a schematic diagram of an exploded view of a first embodiment of a housing 1 in the present invention. The housing 1 in the embodiment of the present invention includes a first case 11 and a second case 12, the second case 12 is detachably connected to the first case 11, and a gas vent structure 13 is provided in the first case 11 and / or the second case 12, and the gas vent structure 13 communicates with a hollow chamber 14.

[0233] By providing the gas venting structure 13, the housing 1 in the embodiment of the present invention has a non-sealed structure, and the gas enters the hollow chamber 14 of the housing 1 after being discharged from the inside of the contact chamber 27 through the pressure relief hole 221, and then is discharged to the outside of the housing 1 through the gas venting structure 13.

[0234] In addition, the housing 1 of the embodiment of the present invention can prevent the gaseous eruptions generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of release, thereby preventing contamination of other electronic components near the relay. Here, the gaseous eruptions are generated by the high-temperature arc ablation and volatilization of the metal material of the contact assembly 3.

[0235] 46, the gas venting structure 13 includes a slit 131, which is formed between the first case 11 and the second case 12. Gas can be discharged from the relay through the slit 131 between the first case 11 and the second case 12.

[0236] In this embodiment, the slit 131 is located at the bottom of the housing 1 .

[0237] As shown in Fig. 47, Fig. 47 is a schematic exploded view of the second embodiment of the housing 1 of the present invention. The same points as the housing 1 of the second embodiment and the housing 1 of the first embodiment are omitted, but the difference is that the slit 131 is located in the central region of the housing 1 in the height direction.

[0238] As shown in Fig. 48, Fig. 48 is a schematic exploded view of the third embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the third embodiment and the housing 1 of the second embodiment are omitted, but the difference is that the gas vent structure 13 has a slit 131 and a gas vent hole 132, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas vent hole 132 is formed in the second case 12. Gas can be discharged from the relay through the slit 131 and the gas vent hole 132. Of course, the gas vent hole 132 may be provided in the first case 11.

[0239] As shown in Fig. 49, Fig. 49 is a schematic diagram of an exploded view of a fourth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fourth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting cover 133, the slit 131 is formed in the central region in the height direction of the housing 1, the gas venting cover 133 is provided in the first case 11, and the opening of the gas venting cover 133 faces downward. In this way, gas can be discharged from the relay through the slit 131 and the gas venting cover 133, and the gas discharged from the gas venting cover 133 is ejected downward, and does not affect other electronic devices near the relay.

[0240] Of course, the gas vent cover 133 may be provided on the second case 12, or both the first case 11 and the second case 12 are provided with the gas vent cover 133.

[0241] As shown in Fig. 50, Fig. 50 is a schematic exploded view of the fifth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fifth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting grill 134, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas venting grill 134 is provided in the first case 11. Of course, the gas venting grill 134 may be provided in the second case 12, or both the first case 11 and the second case 12 are provided with the gas venting grill 134.

[0242] The gas can be exhausted from the relay through the slits 131 and the gas venting grill 134. When the gas passes through the gas venting grill 134, the gas venting grill 134 can make the gas flow more slowly, and can prevent the exhausted gas from affecting other electronic components near the relay.

[0243] In addition, various examples / embodiments provided by the present invention can be combined with each other without causing a contradiction, and will not be described herein with examples.

[0244] As described above, the advantages and beneficial effects of the relay according to the embodiments of the present invention include at least the following:

[0245] In the relay of the embodiment of the present invention, a pressure relief valve assembly 5 is installed in the sealed container 2 to release over-pressure gas, and further, under abnormal circumstances such as short circuit or overload shutdown of the contact assembly 3, the high temperature inside the chamber of the relay will not cause the chamber body to explode and disintegrate, thereby improving the reliability of the product.

[0246] In addition, the housing 1 of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the emitted gas in a timely manner and prevent the emitted gas from contaminating other electronic devices.

[0247] 51-61, an embodiment of the present invention provides a relay that can improve safety to solve the problem of explosion proneness existing in the related art.

[0248] In an embodiment of the present invention, a relay includes a contact receptacle, a contact assembly, and a pressure relief valve assembly. The contact container comprises a ceramic cover, a connecting part, and a first yoke plate, the ceramic cover being connected to the first yoke plate via the connecting part, the ceramic cover, the connecting part, and the first yoke plate forming a contact chamber, the connecting part having a pressure relief hole communicating with the contact chamber, the contact assembly comprising a pair of fixed contact pull-out ends and a movable contactor, the fixed contact pull-out ends being provided on the ceramic cover, one end of the fixed contact pull-out ends entering the contact chamber, the movable contactor being provided in the contact chamber and being driven to contact or separate from the pair of fixed contact pull-out ends, and a pressure relief valve assembly being provided on the connecting part, closing the pressure relief hole when the gas pressure in the contact chamber is lower than a threshold value, and being pierced to open the pressure relief hole when the gas pressure in the contact chamber is equal to or higher than the threshold value.

[0249] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate, which is integral with the connecting piece and is used to close or open the pressure relief hole.

[0250] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate, which is provided separately from the connecting part, is provided at the pressure relief hole, and is used to close or open the pressure relief hole.

[0251] According to some embodiments of the invention, the connection piece has an inner wall surface and an outer wall surface, and the valve plate is provided on the inner wall surface and / or the outer wall surface.

[0252] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the connecting piece via the transition piece.

[0253] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a protective cover, the protective cover being connected to the connecting piece and covering an outer surface of the valve plate, the protective cover having an air vent.

[0254] According to some embodiments of the present invention, the relay further comprises a housing, the housing having a hollow chamber; The contact vessel and the pressure relief valve assembly are disposed in the hollow chamber.

[0255] According to some embodiments of the present invention, the housing comprises a first case and a second case; A second case is detachably connected to the first case, and a vent structure is provided in the first case and / or the second case, and the vent structure communicates with the hollow chamber.

[0256] According to some embodiments of the present invention, the venting structure comprises a slit, the slit being formed between the first case and the second case.

[0257] According to some embodiments of the present invention, the venting structure comprises a vent hole and / or a vent cover and / or a vent grill.

[0258] According to some embodiments of the invention, the hollow chamber communicates with the exterior of the housing.

[0259] According to some embodiments of the present invention, the structural strength of the pressure relief valve assembly is less than the structural strength of the contact vessel.

[0260] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0261] The relay of the embodiment of the present invention is provided with a pressure relief valve assembly in the connecting part, which can be used to release over-pressure gas. Furthermore, under abnormal circumstances such as short circuit or overload interruption of the contact assembly, the relay can ensure that the sealed chamber will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the contact chamber, thereby improving the reliability of the product.

[0262] In addition, the housing of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the released gas in a timely manner and prevent the released gas from contaminating other electronic devices.

[0263] As described in the Background Art, in the relay contact system of the related art, at the moment of high current short circuit or overload cutoff, the contact sealing cavity is prone to explosion, which is a safety hazard. The inventors have found in their research that when the contact inside the contact sealing cavity suddenly burns with an arc, high temperature is instantaneously generated inside the sealing cavity, which causes the air pressure inside the contact sealing cavity to instantly and rapidly rise, and when the air pressure strength inside the contact sealing cavity is greater than the strength of the components or the strength of the connection points of the contact sealing cavity, the contact sealing cavity of the relay is prone to explosion.

[0264] As shown in Fig. 51 and Fig. 52, Fig. 51 is a top view of a relay in an embodiment of the present invention. Fig. 52 is a cross-sectional view of DD in Fig. 51. The relay in the embodiment of the present invention includes a housing 1, a contact container 2, a contact assembly 3, a drive assembly 4, and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, and the hollow chamber 14 communicates with the outside of the housing 1. The contact container 2 is provided in the hollow chamber 14, and the contact container 2 includes a ceramic cover 211, a connection part 212, and a first yoke plate 22. The ceramic cover 211 is connected to the first yoke plate 22 via the connection part 212, and the ceramic cover 211, the connection part 212, and the first yoke plate 22 form a contact chamber 27. The connection part 212 has a pressure relief hole 221, and the pressure relief hole 221 communicates with the contact chamber 27 and the hollow chamber 14, respectively. The contact assembly 3 includes a pair of fixed contact pull-out ends 31 and a movable contact 32. The fixed contact pull-out end 31 is provided in the ceramic cover 211, one end of the fixed contact pull-out end 31 enters the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The movable contact 32 is provided in the contact chamber 27 and is used to make contact with or separate from the pair of fixed contact pull-out ends 31 by driving. The driving assembly 4 is provided in the hollow chamber 14 and connected to the movable contact 32, and drives the movement of the movable contact 32 to make contact with or separate from both ends of the movable contact 32 and the pair of fixed contact pull-out ends 31. The pressure relief valve assembly 5 is provided in the connecting part 212 and is used to close the pressure relief hole 221 when the gas pressure in the contact chamber 27 is lower than a certain threshold, and to break through to open the pressure relief hole 221 when the gas pressure in the contact chamber 27 is equal to or higher than a certain threshold. The structural strength of the pressure relief valve assembly 5 is smaller than that of the contact vessel 2, and in a normal operating state, the maximum value of the intensity of the gas pressure in the contact chamber 27 is smaller than the structural strength of the pressure relief valve assembly 5, while in an abnormal operating state, the maximum value of the intensity of the gas pressure in the contact chamber 27 is greater than the structural strength of the pressure relief valve assembly 5. In addition, when the pressure relief valve assembly 5 closes the pressure relief hole 221, it maintains the sealing of the contact chamber 27 and ensures the normal operation of the relay.Of course, in other embodiments, the pressure relief valve assembly 5 need only ensure that when the pressure relief hole 221 is closed, the contact chamber 27 is not absolutely sealed and the relay operates normally.

[0265] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed in the connection part 212 to close or open the pressure relief hole 221. When the contact assembly 3 is in a normal operating state, the intensity of the gas pressure in the contact chamber 27 is less than the threshold, so that the pressure relief valve assembly 5 is not broken by the air pressure in the contact chamber 27, and still maintains the pressure relief hole 221 in a closed state, and the relay operates normally. When the contact assembly 3 is in an abnormal operating state, the intensity of the gas pressure in the contact chamber 27 is equal to or greater than the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the contact chamber 27, and the contact chamber 27 communicates with the hollow chamber 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the contact chamber 27 can be released to the hollow chamber 14 through the pressure relief hole 221, and finally released to the outside of the housing 1. That is, in the process of the gradual increase in the intensity of the gas pressure in the contact chamber 27 under abnormal operating conditions, the gas pressure will first break through the pressure relief valve assembly 5, and then the suddenly increased gas pressure will be released through the pressure relief hole 221, so that the air pressure inside the contact chamber 27 will not continue to rise and will not reach the structural strength of the contact vessel 2, thereby avoiding the explosion of the contact vessel 2. Under normal operating conditions, the gas pressure in the contact chamber 27 will not break through the pressure relief valve assembly 5, and the pressure relief valve assembly 5 can still play the role of sealing the pressure relief hole 221.

[0266] The term "normal operating state" means that the relay current is in the rated operating state, and the term "abnormal operating state" means that the contact assembly 3 is in a moment of high current short circuit, overload interruption, etc. The term "threshold" refers to a pressure strength that is slightly larger than the strength of the gas pressure in the contact vessel 2 when the relay is in a normal operating state. Depending on the relay model, the threshold value is also suitable for adjustment, but cannot be larger than the structural strength of the contact vessel 2.

[0267] That is, when the relay is operating normally, the gas pressure in the contact vessel 2 does not reach this threshold and the pressure relief valve assembly 5 is not breached. When the relay is in an abnormal operating state, the gas pressure in the contact vessel 2 is equal to or exceeds this threshold and the pressure relief valve assembly 5 is breached by the gas.

[0268] In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the contact vessel 2. Thus, when the relay is in an abnormal operating state and the gas pressure in the contact vessel 2 gradually increases, the pressure relief valve assembly 5 is breached by the gas before the contact vessel 2 is breached.

[0269] In addition, the design of the pressure relief valve assembly 5 to have a structural strength smaller than that of the contact vessel 2 can be achieved by using different materials and / or structures of the two. For example, when the pressure relief valve assembly 5 and the vessel wall of the contact vessel 2 are made of the same material, the pressure relief valve assembly 5 can be designed to have a thin thickness and be smaller than that of the vessel wall of the contact vessel 2, so that the gas with a gradually increased temperature breaks through the pressure relief valve assembly 5 first. Of course, when the pressure relief valve assembly 5 and the vessel wall of the contact vessel 2 are made of the same thickness, the pressure relief valve assembly 5 can be made of ceramic, while the contact vessel 2 can be made of metal, so that the pressure relief valve assembly 5 breaks through first. Or, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall of the contact vessel 2 is thick and made of metal. Of course, other suitable methods can be adopted to make the structural strength of the pressure relief valve assembly 5 smaller than that of the contact vessel 2, and they will not be listed here.

[0270] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or assemblies inherent to those processes, methods, products or devices.

[0271] In addition, the relay according to the embodiment of the present invention does not include the housing 1, and after assembling the contact container 2, the contact assembly 3, the drive assembly 4, and the pressure relief valve assembly 5, the relay may be directly installed in an application product such as a battery pack, an electrical control box, etc.

[0272] Next, referring to Figs. 51 and 52, the contact assembly 3 includes two fixed contact pull-out ends 31 as current inflow and current outflow, and one movable contactor 32. The movable contactor 32 may be a straight piece, and both ends of the drive assembly 32 can contact the two fixed contact pull-out ends 31 along the longitudinal direction of the movable contactor 32 by the action of the drive assembly 4, respectively, to realize the on-state of the load. The bottom of the fixed contact pull-out end 31 can be a fixed contact, and both ends of the movable contactor 32 in the longitudinal direction can be a movable contact. The movable contacts at both ends of the movable contactor 32 may protrude from other parts of the movable contactor 32, or may be flush with other parts.

[0273] The fixed contact may be provided integrally or separately at the bottom of the fixed contact drawn end 31, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction in which the movable contactor 32 extends.

[0274] The two fixed contact pull-out ends 31 are provided on the ceramic cover 211, for example, on the top of the ceramic cover 211. One end of each fixed contact pull-out end 31 enters the inside of the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The one end of the fixed contact pull-out end 31 that enters the inside of the contact chamber 27 is used to contact the movable contact 32.

[0275] The relay also comprises an arc-extinguishing unit 7 mounted in the hollow chamber 14 of the housing 1 for extinguishing the arc of the contact assembly 3 .

[0276] In this embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The arc-extinguishing magnets 71 may be permanent magnets, and each of the arc-extinguishing magnets 71 may be substantially rectangular. The two arc-extinguishing magnets 71 are provided on both sides of the contact vessel 2, respectively, and are provided facing each other along the longitudinal direction of the movable contactor 32.

[0277] As shown in Fig. 52, the two arc-extinguishing magnets 71 are located on both the left and right sides of the ceramic cover 211. In this embodiment, the polarities of the opposing faces of the two arc-extinguishing magnets 71 are opposite. That is, the left face of the arc-extinguishing magnet 71 located on the left side of the ceramic cover 211 is an S pole and the right face is an N pole, and the left face of the arc-extinguishing magnet 71 located on the right side of the ceramic cover 211 is an S pole and the right face is an N pole.

[0278] Of course, the polarity of the opposing surfaces of the two arc-extinguishing magnets 71 can also be designed to be the same; for example, the left surface of the arc-extinguishing magnet 71 located on the left side of the ceramic cover 211 has a south pole and the right surface has a north pole, and the left surface of the arc-extinguishing magnet 71 located on the right side of the ceramic cover 211 has a north pole and the right surface has a south pole.

[0279] In this way, by providing two arc-extinguishing magnets 71 arranged opposite to each other, a magnetic field can be formed around the contact assembly 3. Therefore, the arcs generated between the fixed contact pull-out end 31 and the movable contactor 32 are stretched in directions away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0280] The arc-extinguishing unit 7 further includes two yoke clips 72 arranged corresponding to the positions of the two arc-extinguishing magnets 71. The two yoke clips 72 surround the ceramic cover 211 and the two arc-extinguishing magnets 71. The design of the yoke clips 72 surrounding the arc-extinguishing magnets 71 prevents the magnetic field generated by the arc-extinguishing magnets 71 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clips 72 are made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0281] The first yoke plate 22 is provided within the hollow chamber 14 and has a first side 223 and a second side 224 on opposite sides, and a through hole 222, which penetrates the first side 223 and the second side 224.

[0282] The ceramic cover 211 is connected to the first side surface 223 of the first yoke plate 22 via the connecting part 212, and covers the through hole 222. The ceramic cover 211, the connecting part 212, and the first yoke plate 22 are enclosed together as the contact chamber 27, which penetrates the through hole 222, and the contact chamber 27 is used to accommodate the fixed contact lead end 31 and the movable contact 32.

[0283] The metal cover 23 is connected to the second side 224 of the first yoke plate 22 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 constitute a driving chamber 24, which communicates with the through hole 222 and is used to accommodate the fixed iron core 413 and the movable iron core 414, as described below. The contact chamber 27 and the driving chamber 24 communicate with each other via the through hole 222. In this embodiment, the contact chamber 27 communicates with the driving chamber 24 to form a sealed chamber.

[0284] The ceramic cover 211 is connected to the first yoke plate 22 via a connecting part 212. Specifically, the connecting part 212 may have an annular structure, and one end of the connecting part 212 may be connected to an opening edge of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesion, or the like. The other end of the connecting part 212 is connected to a first side surface 223 of the first yoke plate 22, and may be similarly connected by laser welding, brazing, resistance welding, adhesion, or the like. The connecting part 212 is provided between the ceramic cover 211 and the first yoke plate 22, and can facilitate the connection between the ceramic cover 211 and the first yoke plate 22.

[0285] 52, the drive assembly 4 includes an electromagnet unit 41 and a push rod unit 42. The electromagnet unit 41 is disposed on the side of the first yoke plate 22 away from the ceramic cover 211. The push rod unit 42 is drivingly connected to the electromagnet unit 41. The push rod unit 42 is movably provided in the drive chamber 24 and connected to the movable contact 32 through the through hole 222.

[0286] When the electromagnet unit 41 is energized, it can drive and move the push rod unit 42 , which can then move the movable contact 32 to bring it into contact with or away from the fixed contact drawn-out end 31 .

[0287] The electromagnet unit 41 includes a coil bobbin 411, a coil 412, a fixed core 413, and a movable core 414. The coil bobbin 411 is hollow and made of an insulating material. The metal cover 23 is provided in the coil bobbin 411. The coil surrounds the coil bobbin 411. The fixed core 413 is fixed in the metal cover 23, and a part of the fixed core 413 enters the through hole 222. The fixed core 413 has a first hole 4131 provided in correspondence with the position of the through hole 222 for the push rod unit 42 to be provided. The movable core 414 is provided movably in the metal cover 23 and is provided opposite the fixed core 413. The movable core 414 is connected to the push rod unit 42, and is used to be attracted to the fixed core 413 when the coil 412 is energized. The armature 414 and the push rod unit 42 may be connected by threads, caulking, welding, or other methods.

[0288] In this embodiment, the coil bobbin 411 is made of a resin material and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are provided at both ends of the hollow cylindrical portion 4112. The coil 412 surrounds the outer periphery of the hollow cylindrical portion 4112. The metal cover 23 is drilled into the hollow cylindrical portion 4112.

[0289] The electromagnet unit 41 further includes a first elastic part 415, which is located inside the metal cover 23 and disposed between the fixed core 413 and the movable core 414, and is used to reset the movable core 414 when the power supply to the coil 412 is cut off. The first elastic part 415 may be a spring, and may be sleeved on the outside of the push rod unit 42.

[0290] The relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 and the first yoke plate 22 are provided opposite to each other, and the coil bobbin 411 is provided between the first yoke plate 22 and the second yoke plate 25. That is, the first yoke plate 22 is connected to a first flange portion 4111 of the coil bobbin 411, and the second yoke plate 25 is connected to a second flange portion 4113 of the coil bobbin 411.

[0291] A pair of third yoke plates 26 are respectively provided at both ends along the longitudinal direction of the movable contactor 32 of the second yoke plate 25, extend in the direction of the first yoke plate 22, and are connected to both ends along the longitudinal direction of the movable contactor 32 of the first yoke plate 22.

[0292] In this manner, the first yoke plate 22 , the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412 .

[0293] The second yoke plate 25 and the pair of third yoke plates 26 can be formed as an integral structure by, for example, bending. The second yoke plate 25 formed integrally with the first yoke plate 22 and the pair of third yoke plates 26 may be formed as separate structures.

[0294] The relay also includes a magnetically conductive bushing 416 made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof. The magnetically conductive bushing 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the coil bobbin 411 and the outer peripheral surface of the metal cover 23. In this manner, the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the fixed core 413, the movable core 414, and the magnetically conductive bushing 416 together form a magnetic path.

[0295] The push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixed sheet, a push rod 423, a second elastic part 424, a first magnetic conductive body 425, and a second magnetic conductive body 426. The first magnetic conductive body 425 is fixedly connected to the U-shaped bracket 421, and the first magnetic conductive body 425 is provided on the inner surface of the U-shaped bracket 421. The second magnetic conductive body 426 is fixedly connected to the movable contact 32. The base 422, the fixed sheet 427, and the upper part of the push rod 423 can be integrally molded by injection molding.

[0296] The bottom of the U-shaped bracket 421 is fixedly connected to the fixed sheet 427, the U-shaped bracket 421 and the base 422 are enclosed as a frame structure, and the movable contact 32, the first magnetic conductive body 425, and the second magnetic conductive body 426 are attached in the frame structure enclosed by the U-shaped bracket 421 and the base 422. Furthermore, the second elastic part 424 is also provided in the frame structure enclosed by the U-shaped bracket 421 and the base 422, one end of the second elastic part 424 abuts on the base 422 and the other end abuts on the movable contact 32, and the second elastic part 424 can provide an elastic force such that the movable contact 32 and the second magnetic conductive body 426 tend to move away from the base 422 and approach the first magnetic conductive body 425. The push rod 423 is inserted into the through hole 222 of the first yoke plate 22 and the first hole 4131 of the fixed core 413, and one end of the push rod 423 is fixedly connected to the base 422 and the other end of the push rod 423 is fixedly connected to the movable core 414.

[0297] It should be noted that a spring may be used as the second elastic part 424. The first magnetic conductive body 425 and the second magnetic conductive body 426 may be made of a soft magnetic material such as iron, cobalt, nickel, or an alloy thereof.

[0298] When the push rod 423 is not moving upward, the top surface of the movable contact 32 abuts against the first magnetic conductive body 425 under the action of the second elastic part 424. When the coil 412 is energized and the push rod 423 is driven to move upward, both ends of the movable contact 32 contact the two fixed contact lead ends 31 respectively. After that, the push rod 423 continues to move upward, and the first magnetic conductive body 425 also continues to move upward following the push rod 423, but since the movable contact 32 has already contacted the two fixed contact lead ends 31, the movable contact 32 cannot continue to move upward, realizing the overtravel of the contact. The elastic force from the second elastic part forms a certain gap between the bottom surface of the first magnetic conductive body 425 and the top surface of the movable contact 32, thereby causing a magnetic gap to exist between the first magnetic conductive body 425 and the second magnetic conductive body 426.

[0299] As shown in Fig. 53 and Fig. 54, Fig. 53 is a cross-sectional view of the connection part and the valve plate after assembly in the first embodiment of the present invention. Fig. 54 is an enlarged view of a part of the C part in Fig. 53. The ceramic cover 211 has a top wall 2111 and a side wall 2112, and the fixed contact lead end 31 is provided on the top wall 2111. The side wall 2112 is provided around the edge of the top wall 2111, extends toward the first yoke plate 22, and is connected to the connection part 212. The connection part 212 is connected to the first yoke plate 22. The pressure relief hole 221 is provided in the connection part 212. The pressure relief valve assembly 5 includes a valve plate 51, which may be integrally provided in the pressure relief hole 221 of the connection part 212, and is used to close or open the pressure relief hole 221.

[0300] The side surface of the valve plate 51 may be flush with the inner wall surface or the outer wall surface of the connection part 212. Of course, the two opposite side surfaces of the valve plate 51 do not have to be flush with the inner wall surface or the outer wall surface of the connection part 212. When the valve plate 51 and the connection part 212 have an integral structure, the valve plate 51 and the connection part 212 are made of the same material.

[0301] As shown in Fig. 55, Fig. 55 is a cross-sectional view of the connection part and the valve plate after assembly in the second embodiment of the present invention. The same points as the first embodiment and the second embodiment are omitted, but the difference is that the valve plate 51 is provided separately from the connection part 212 and covers the pressure relief hole 221.

[0302] The valve plate 51 may be directly connected to the connection part 212, or may be connected to the connection part 212 via a transition part. The valve plate 51 may be provided on an inner wall surface of the connection part 212, or may be provided on an outer wall surface of the connection part 212.

[0303] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0304] As shown in Fig. 56, Fig. 56 is a cross-sectional view of a protective cover 53 attached to a connecting part in an embodiment of the present invention. The pressure relief valve assembly 5 further includes a protective cover 53, which is connected to the connecting part 212 and is provided to cover the outer surface of the valve plate 51. The protective cover 53 has a vent hole 531, and gas can act on the valve plate 51 through the vent hole 531.

[0305] The protective cover 53 may be provided on the outer wall surface of the connection part 212 .

[0306] In this embodiment, the protective cover 53 is added to prevent gas from breaking through the valve plate 51 in an abnormal operating state, and also protects the valve plate 51 during transportation or installation of the connecting part 212, thereby preventing the valve plate 51 from being broken through by external objects.

[0307] The protective cover 53 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, etc.

[0308] The protective cover 53 can be connected to the connection part 212 by methods such as laser welding, brazing, resistance welding, adhesive bonding, locking, and the like.

[0309] As shown in Fig. 57, Fig. 57 is a schematic diagram of an exploded view of a first embodiment of a housing 1 according to the present invention. The housing 1 according to the embodiment of the present invention includes a first case 11 and a second case 12, the second case 12 is detachably connected to the first case 11, and a vent structure 13 is provided in the first case 11 and / or the second case 12, and the vent structure 13 communicates with a hollow chamber 14.

[0310] By providing the gas venting structure 13, the housing 1 in the embodiment of the present invention has a non-sealed structure, and the gas enters the hollow chamber 14 of the housing 1 after being discharged from the inside of the contact chamber 27 through the pressure relief hole 221, and then is discharged to the outside of the housing 1 through the gas venting structure 13.

[0311] In addition, the housing 1 of the embodiment of the present invention can prevent the gaseous eruptions generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of release, thereby preventing contamination of other electronic components near the relay. Here, the gaseous eruptions are generated by the high-temperature arc ablation and volatilization of the metal material of the contact assembly 3.

[0312] 57, the gas venting structure 13 includes a slit 131, which is formed between the first case 11 and the second case 12. Gas can be discharged from the relay through the slit 131 between the first case 11 and the second case 12.

[0313] In this embodiment, the slit 131 is located at the bottom of the housing 1 .

[0314] As shown in Fig. 58, Fig. 58 is a schematic exploded view of the second embodiment of the housing 1 of the present invention. The same points as the housing 1 of the second embodiment and the housing 1 of the first embodiment are omitted, but the difference is that the slit 131 is located in the central region of the housing 1 in the height direction.

[0315] As shown in Fig. 59, Fig. 59 is a schematic exploded view of the third embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the third embodiment and the housing 1 of the second embodiment are omitted, but the difference is that the gas vent structure 13 has a slit 131 and a gas vent hole 132, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas vent hole 132 is formed in the second case 12. Gas can be discharged from the relay through the slit 131 and the gas vent hole 132. Of course, the gas vent hole 132 may be provided in the first case 11.

[0316] As shown in Fig. 60, Fig. 60 is a schematic diagram of an exploded view of a fourth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fourth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting cover 133, the slit 131 is formed in the central region in the height direction of the housing 1, the gas venting cover 133 is provided in the first case 11, and the opening of the gas venting cover 133 faces downward. In this way, gas can be discharged from the relay through the slit 131 and the gas venting cover 133, and the gas discharged from the gas venting cover 133 is ejected downward, and does not affect other electronic devices near the relay.

[0317] Of course, the gas vent cover 133 may be provided on the second case 12, or both the first case 11 and the second case 12 are provided with the gas vent cover 133.

[0318] As shown in Fig. 61, Fig. 61 is a schematic exploded view of the fifth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fifth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting grill 134, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas venting grill 134 is provided in the first case 11. Of course, the gas venting grill 134 may be provided in the second case 12, or both the first case 11 and the second case 12 are provided with the gas venting grill 134.

[0319] The gas can be exhausted from the relay through the slits 131 and the gas venting grill 134. When the gas passes through the gas venting grill 134, the gas venting grill 134 can make the gas flow more slowly, and can prevent the exhausted gas from affecting other electronic components near the relay.

[0320] In addition, various examples / embodiments provided by the present invention can be combined with each other without causing a contradiction, and will not be described herein with examples.

[0321] As described above, the advantages and beneficial effects of the relay according to the embodiments of the present invention include at least the following:

[0322] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed in the connecting part 212, which allows over-pressure gas to escape, and further ensures that even in an abnormal situation such as a short circuit or overload shutdown of the contact assembly 3, the relay will not explode and disintegrate the sealed chamber due to the rapid expansion of gas caused by the high temperature inside the contact chamber 27, thereby improving the reliability of the product.

[0323] In addition, the housing 1 of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the emitted gas in a timely manner and prevent the emitted gas from contaminating other electronic devices.

[0324] Furthermore, referring to Figs. 62-76, an embodiment of the present invention provides a relay that can improve safety to solve the problem of explosion proneness existing in the related art.

[0325] A relay according to an embodiment of the present invention includes a container, a contact assembly, a drive assembly, and a pressure relief valve assembly. The container includes an insulating cover, a first yoke plate, and a metal cover, the insulating cover and the first yoke plate are connected to form a contact chamber, the metal cover and the first yoke plate are connected to form a drive chamber, the first yoke plate has a through hole, the contact chamber communicates with the drive chamber via the through hole, the metal cover has a pressure relief hole, the pressure relief hole communicates with the drive chamber, the contact assembly includes a pair of fixed contact lead ends and a movable contact, the fixed contact lead ends are provided on the insulating cover, one end of the fixed contact lead ends enters the contact chamber, and the movable contact is connected to the contact chamber. a pressure relief valve assembly provided in the metal cover and used to close the pressure relief hole when the gas pressure in the container is lower than a certain threshold value and to be broken through to open the pressure relief hole when the gas pressure in the container is equal to or higher than a certain threshold value; a pressure relief valve assembly provided in the metal cover and used to close the pressure relief hole when the gas pressure in the container is lower than a certain threshold value and to be broken through to open the pressure relief hole when the gas pressure in the container is equal to or higher than a certain threshold value;

[0326] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate, which is integral with the metal cover and is used to close or open the pressure relief hole.

[0327] According to some embodiments of the present invention, the pressure relief valve assembly comprises a valve plate, which is separate from the metal cover, is provided at the pressure relief hole, and is used to close or open the pressure relief hole.

[0328] According to some embodiments of the present invention, the metal cover has an inner wall surface and an outer wall surface, and the valve plate is disposed on the inner wall surface and / or the outer wall surface.

[0329] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the metal cover via the transition piece.

[0330] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a protective cover, the protective cover being connected to the metal cover and covering an outer surface of the valve plate, the protective cover having an air vent.

[0331] According to some embodiments of the present invention, the metal cover comprises a bottom wall and a side wall; The pressure relief hole is provided in the bottom wall, The side wall surrounds an edge of the bottom wall, extends toward the first yoke plate, and is connected to the first yoke plate.

[0332] According to some embodiments of the present invention, the drive assembly further comprises an electromagnet unit; An electromagnet unit is provided on a side of the first yoke plate away from the insulating cover, and the push rod unit is connected to the electromagnet unit and a drive.

[0333] According to some embodiments of the present invention, the electromagnet unit includes a coil bobbin, a coil, a fixed core, a movable core, and a first elastic part; The coil bobbin has a hollow cylindrical shape, and the metal cover is drilled into the coil bobbin. a coil surrounding the coil bobbin; a fixed core is fixedly provided within the metal cover, a portion of the fixed core extends into the through hole, the fixed core has a first bore, the first bore is provided corresponding to the position of the through hole, and is used for the push rod unit to be bored therein; the movable core is movably provided within the metal cover and opposed to the fixed core, the movable core is connected to the push rod unit, and is used to be attracted by the fixed core when the coil is energized, A first elastic part is disposed between the fixed core and the movable core and is used to reset the movable core when the coil is de-energized.

[0334] According to some embodiments of the present invention, the relay further comprises a housing, the housing having a hollow chamber; The container, the drive assembly and the pressure relief valve assembly are disposed within the hollow chamber.

[0335] According to some embodiments of the present invention, the housing comprises a first case and a second case. A second case is detachably connected to the first case, and a vent structure is provided in the first case and / or the second case, and the vent structure communicates with the hollow chamber.

[0336] According to some embodiments of the present invention, the venting structure comprises a slit, the slit being formed between the first case and the second case.

[0337] According to some embodiments of the present invention, the venting structure comprises a vent hole and / or a vent cover and / or a vent grill.

[0338] According to some embodiments of the invention, the hollow chamber communicates with the exterior of the housing.

[0339] According to some embodiments of the present invention, the structural strength of the pressure relief valve assembly is less than the structural strength of the vessel.

[0340] According to some embodiments of the present invention, the insulating cover comprises a ceramic cover and a connecting piece, The fixed contact lead end is provided on the ceramic cover, One end of the connection part is connected to the opening edge of the ceramic cover, and the other end is connected to the first yoke plate.

[0341] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0342] The relay of the embodiment of the present invention is provided with a pressure relief valve assembly on the first yoke plate, which is used to release over-pressure gas. Furthermore, under abnormal circumstances such as short circuit of the contact assembly or overload interruption, the relay can ensure that the sealed chamber will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the chamber, thereby improving the reliability of the product.

[0343] Moreover, the housing of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can exhaust the released gas in a timely manner and avoid the release from causing pollution to other electronic devices.

[0344] As described in the Background Art, in the relay contact system of the related art, at the moment of high current short circuit or overload cutoff, the contact sealing cavity is prone to explosion, which is a safety hazard. The inventors have found in their research that when the contact inside the contact sealing cavity suddenly burns with an arc, high temperature is instantaneously generated inside the sealing cavity, which causes the air pressure inside the contact sealing cavity to instantly and rapidly rise, and when the air pressure strength inside the contact sealing cavity is greater than the strength of the components or the strength of the connection points of the contact sealing cavity, the contact sealing cavity of the relay is prone to explosion.

[0345] As shown in Fig. 62 and Fig. 63, Fig. 62 is a top view of a relay in an embodiment of the present invention. Fig. 63 is a cross-sectional view of EE in Fig. 62. The relay in the embodiment of the present invention includes a housing 1, a container 2, a contact assembly 3, a drive assembly 4, and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, and the hollow chamber 14 communicates with the outside of the housing 1. The container 2 is provided in the hollow chamber 14, and includes an insulating cover 21, a first yoke plate 22, and a metal cover 23. The insulating cover 21 and the first yoke plate 22 are connected to form a contact chamber 27, and the metal cover 23 and the first yoke plate 22 are connected to form a drive chamber 24. The first yoke plate 22 has a through hole 222, and the contact chamber 27 communicates with the drive chamber 24 via the through hole 222. The metal cover 23 has a pressure relief hole 221, which penetrates the cover wall of the metal cover 23 and communicates with the driving chamber 24 and the hollow chamber 14. The contact assembly 3 has a pair of fixed contact pull-out ends 31 and a movable contact 32, the fixed contact pull-out end 31 is provided in the insulating cover 21, one end of the fixed contact pull-out end 31 enters the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The movable contact 32 is provided in the contact chamber 27. The driving assembly 4 is provided in the hollow chamber 14, and has a push rod unit 42, which is movably drilled in the through hole 222, one end of the push rod unit 42 enters the contact chamber 27 and is connected to the movable contact 32, and the other end enters the driving chamber 24. The pressure relief valve assembly 5 is provided on the metal cover 23, and is used to close the pressure relief hole 221 when the gas pressure in the container 2 is lower than a certain threshold, and to be broken through to open the pressure relief hole 221 when the gas pressure in the container 2 is equal to or higher than a certain threshold. The structural strength of the pressure relief valve assembly 5 is smaller than the structural strength of the container 2, and in a normal operating state, the maximum value of the strength of the gas pressure in the container 2 is smaller than the structural strength of the pressure relief valve assembly 5, and in an abnormal operating state, the maximum value of the strength of the gas pressure in the container 2 is greater than the structural strength of the pressure relief valve assembly 5.Note that when the pressure relief valve assembly 5 closes the pressure relief hole 221, it maintains the sealability of the container 2 and ensures the normal operation of the relay. Of course, in other embodiments, when the pressure relief valve assembly 5 closes the pressure relief hole 221, the container 2 is not absolutely sealed, and it is only necessary to ensure the normal operation of the relay.

[0346] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the metal cover 23 to close or open the pressure relief hole 221. When the contact assembly 3 is in a normal operating state, the intensity of the gas pressure in the container 2 is less than the threshold, so that the pressure relief valve assembly 5 is not broken by the atmospheric pressure in the container 2, and still maintains the pressure relief hole 221 in a closed state, ensuring that the relay operates normally. When the contact assembly 3 is in an abnormal operating state, the intensity of the gas pressure in the container 2 is equal to or greater than the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the container 2, and the container 2 communicates with the hollow chamber 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the container 2 can be released to the hollow chamber 14 through the pressure relief hole 221, and finally released to the outside of the housing 1. That is, in the process of the gradual increase in the intensity of the gas pressure inside the container 2 under abnormal operating conditions, the gas pressure will first break through the pressure relief valve assembly 5, and then the suddenly increased gas pressure will be released through the pressure relief hole 221, so that the air pressure inside the container 2 will not continue to rise and will not reach the structural strength of the container 2, thereby avoiding the explosion of the container 2. Under normal operating conditions, the gas pressure inside the container 2 will not break through the pressure relief valve assembly 5, and the pressure relief valve assembly 5 can still play its role of sealing the pressure relief hole 221.

[0347] The term "normal operating state" means that the relay current is in the rated operating state, and the term "abnormal operating state" means that the contact assembly 3 is in a moment of high current short circuit, overload interruption, etc. The term "threshold" refers to a pressure strength that is slightly larger than the strength of the gas pressure in the container 2 when the relay is in a normal operating state. Depending on the relay model, the threshold value is also suitable for adjustment, but cannot be larger than the structural strength of the container 2.

[0348] That is, when the relay is operating normally, the gas pressure in the vessel 2 does not reach this threshold and the pressure relief valve assembly 5 is not breached. When the relay is in an abnormal operating state, the gas pressure in the vessel 2 is equal to or exceeds this threshold and the pressure relief valve assembly 5 is breached by the gas.

[0349] In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the container 2. Thus, when the relay is in an abnormal operating state and the gas pressure in the container 2 gradually increases, the pressure relief valve assembly 5 will be breached by the gas before the container 2.

[0350] In addition, the design of the pressure relief valve assembly 5 to have a structural strength smaller than that of the container 2 can be achieved by using different materials and / or structures of the two. For example, when the pressure relief valve assembly 5 and the container wall of the container 2 are made of the same material, the pressure relief valve assembly 5 can be designed to have a thin thickness and be smaller than that of the container wall of the container 2, so that the gas with a gradually increasing temperature will break through the pressure relief valve assembly 5 first. Of course, when the pressure relief valve assembly 5 and the container wall of the container 2 are made of the same thickness, the pressure relief valve assembly 5 can be made of ceramic, while the container 2 can be made of metal, so that the pressure relief valve assembly 5 will be broken through first. Or, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall of the container 2 is thick and made of metal. Of course, other suitable methods can be adopted to make the structural strength of the pressure relief valve assembly 5 smaller than that of the contact container 2, and they will not be listed here.

[0351] In this embodiment, the thickness of the pressure relief valve assembly 5 may be less than the wall thickness of the metal cover 23. Alternatively, the pressure relief valve assembly 5 may be made of ceramic and the metal cover 23 may be made of metal.

[0352] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or assemblies inherent to those processes, methods, products or devices.

[0353] In addition, the relay according to the embodiment of the present invention does not include the housing 1, and after assembling the container 2, the contact assembly 3, the drive assembly 4, and the pressure relief valve assembly 5, the relay may be directly installed in an application product such as a battery pack, an electrical control box, etc.

[0354] Next, referring to Fig. 62 and Fig. 63, the contact assembly 3 includes two fixed contact pull-out ends 31 as current inflow and current outflow, and one movable contact 32. The movable contact 32 may be a straight piece, and both ends of the drive assembly 32 can contact the two fixed contact pull-out ends 31 along the longitudinal direction of the movable contact 32 by the action of the drive assembly 4, respectively, to realize the on-state of the load. The bottom of the fixed contact pull-out end 31 can be a fixed contact, and both ends of the movable contact 32 in the longitudinal direction can be a movable contact. The movable contacts at both ends of the movable contact 32 may protrude from other parts of the movable contact 32, or may be flush with other parts.

[0355] The fixed contact may be provided integrally or separately at the bottom of the fixed contact drawn end 31, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction in which the movable contactor 32 extends.

[0356] The two fixed contact pull-out ends 31 are provided on the insulating cover 21, for example, on the top of the insulating cover 21. One end of each fixed contact pull-out end 31 enters the inside of the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The one end of the fixed contact pull-out end 31 that enters the inside of the contact chamber 27 is used to contact the movable contact 32.

[0357] The relay also comprises an arc-extinguishing unit 7 mounted in the hollow chamber 14 of the housing 1 for extinguishing the arc of the contact assembly 3 .

[0358] In this embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The arc-extinguishing magnets 71 may be permanent magnets, and each of the arc-extinguishing magnets 71 may be substantially rectangular. The two arc-extinguishing magnets 71 are provided on both sides of the insulating cover 21, respectively, and are provided facing each other along the longitudinal direction of the movable contactor 32.

[0359] As shown in Fig. 63, the two arc-extinguishing magnets 71 are located on both the left and right sides of the insulating cover 21. In this embodiment, the polarities of the opposing faces of the two arc-extinguishing magnets 71 are opposite. That is, the left face of the arc-extinguishing magnet 71 located on the left side of the insulating cover 21 is an S pole and the right face is an N pole, and the left face of the arc-extinguishing magnet 71 located on the right side of the insulating cover 21 is an S pole and the right face is an N pole.

[0360] Of course, the polarities of the opposing surfaces of the two arc-extinguishing magnets 71 can also be designed to be the same; for example, the left surface of the arc-extinguishing magnet 71 located on the left side of the insulating cover 21 has a south pole and the right surface has a north pole, and the left surface of the arc-extinguishing magnet 71 located on the right side of the insulating cover 21 has a north pole and the right surface has a south pole.

[0361] In this way, by providing two arc-extinguishing magnets 71 arranged opposite to each other, a magnetic field can be formed around the contact assembly 3. Therefore, the arcs generated between the fixed contact pull-out end 31 and the movable contactor 32 are stretched in directions away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0362] The arc-extinguishing unit 7 further includes two yoke clips 72 arranged corresponding to the positions of the two arc-extinguishing magnets 71. The two yoke clips 72 surround the insulating cover 21 and the two arc-extinguishing magnets 71. The design of the yoke clips 72 surrounding the arc-extinguishing magnets 71 prevents the magnetic field generated by the arc-extinguishing magnets 71 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clips 72 are made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0363] The container 2 comprises a first yoke plate 22, an insulating cover 21, and a metal cover 23, and the first yoke plate 22 is provided within the hollow chamber 14 and has a first side 223 and a second side 224 provided on opposite sides, and a through hole 222, and the through hole 222 penetrates the first side 223 and the second side 224.

[0364] The insulating cover 21 is connected to the first side surface 223 and covers the through hole 222. The insulating cover 21 and the first yoke plate 22 form a contact chamber 27, which communicates with the through hole 222 and is used to accommodate the fixed contact lead end 31 and the movable contact 32.

[0365] The metal cover 23 is connected to the second side 224 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 constitute the driving chamber 24, which communicates with the through hole 222 and is used to accommodate the fixed iron core 413 and the movable iron core 414, as described below. The contact chamber 27 and the driving chamber 24 communicate with each other via the through hole 222. In this embodiment, the contact chamber 27 communicates with the driving chamber 24 to form a sealed chamber.

[0366] The insulating cover 21 may include a ceramic cover 211 and a connecting part 212, and two fixed contact lead ends 31 are provided on the ceramic cover 211. The ceramic cover 211 is connected to the first yoke plate 22 through the connecting part 212. Specifically, the connecting part 212 may be an annular structure, and one end of the connecting part 212 may be connected to the opening edge of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesion, etc. The other end of the connecting part 212 is connected to the first side surface 223 of the first yoke plate 22, and may also be connected by laser welding, brazing, resistance welding, adhesion, etc. The connecting part 212 is provided between the ceramic cover 211 and the first yoke plate 22, which can facilitate the connection between the ceramic cover 211 and the first yoke plate 22.

[0367] 63, the drive assembly 4 includes an electromagnet unit 41 and a push rod unit 42. The electromagnet unit 41 is disposed on the side of the first yoke plate 22 away from the insulating cover 21. The push rod unit 42 is drivingly connected to the electromagnet unit 41. The push rod unit 42 is movably provided in the drive chamber 24 and connected to the movable contact 32 through the through hole 222.

[0368] When the electromagnet unit 41 is energized, it can drive and move the push rod unit 42 , which can then move the movable contact 32 to bring it into contact with or away from the fixed contact drawn-out end 31 .

[0369] The electromagnet unit 41 includes a coil bobbin 411, a coil 412, a fixed core 413, and a movable core 414. The coil bobbin 411 is hollow and made of an insulating material. The metal cover 23 is provided in the coil bobbin 411. The coil 412 surrounds the coil bobbin 411. The fixed core 413 is fixed in the metal cover 23, and a part of the fixed core 413 enters the through hole 222. The fixed core 413 has a first hole 4131 provided in correspondence with the position of the through hole 222 for the push rod unit 42 to be provided. The movable core 414 is provided movably in the metal cover 23 and is provided opposite the fixed core 413. The movable core 414 is connected to the push rod unit 42, and is used to be attracted to the fixed core 413 when the coil 412 is energized. The armature 414 and the push rod unit 42 may be connected by threads, caulking, welding, or other methods.

[0370] In this embodiment, the coil bobbin 411 is made of a resin material and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are provided on both ends of the hollow cylindrical portion 4112. The coil 412 surrounds the outer periphery of the hollow cylindrical portion 4112. The metal cover 23 is drilled into the hollow cylindrical portion 4112.

[0371] The electromagnet unit 41 further includes a first elastic part 415, which is located inside the metal cover 23 and disposed between the fixed core 413 and the movable core 414, and is used to reset the movable core 414 when the power supply to the coil 412 is cut off. The first elastic part 415 may be a spring, and may be sleeved on the outside of the push rod unit 42.

[0372] The relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 and the first yoke plate 22 are provided opposite to each other, and the coil bobbin 411 is provided between the first yoke plate 22 and the second yoke plate 25. That is, the first yoke plate 22 is connected to a first flange portion 4111 of the coil bobbin 411, and the second yoke plate 25 is connected to a second flange portion 4113 of the coil bobbin 411.

[0373] A pair of third yoke plates 26 are respectively provided at both ends along the longitudinal direction of the movable contactor 32 of the second yoke plate 25, extend in the direction of the first yoke plate 22, and are connected to both ends along the longitudinal direction of the movable contactor 32 of the first yoke plate 22.

[0374] In this manner, the first yoke plate 22 , the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412 .

[0375] The second yoke plate 25 and the pair of third yoke plates 26 can be formed as an integral structure by, for example, bending. The second yoke plate 25 formed integrally with the first yoke plate 22 and the pair of third yoke plates 26 may be formed as separate structures.

[0376] The relay also includes a magnetically conductive bushing 416 made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof. The magnetically conductive bushing 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the coil bobbin 411 and the outer peripheral surface of the metal cover 23. In this manner, the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the fixed core 413, the movable core 414, and the magnetically conductive bushing 416 together form a magnetic path.

[0377] The push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixed sheet, a push rod 423, a second elastic part 424, a first magnetic conductive body 425, and a second magnetic conductive body 426. The first magnetic conductive body 425 is fixedly connected to the U-shaped bracket 421, and the first magnetic conductive body 425 is provided on the inner surface of the U-shaped bracket 421. The second magnetic conductive body 426 is fixedly connected to the movable contact 32. The base 422, the fixed sheet 427, and the upper part of the push rod 423 can be integrally molded by injection molding.

[0378] The bottom of the U-shaped bracket 421 is fixedly connected to the fixed sheet, the U-shaped bracket 421 and the base 422 are surrounded by a frame structure, and the movable contact 32, the first magnetic conductive body 425, and the second magnetic conductive body 426 are attached in the frame structure surrounded by the U-shaped bracket 421 and the base 422. In addition, the second elastic part 424 is also provided in the frame structure surrounded by the U-shaped bracket 421 and the base 422, one end of the second elastic part 424 abuts on the base 422 and the other end abuts on the movable contact 32, and the second elastic part 424 can provide an elastic force so that the movable contact 32 and the second magnetic conductive body 426 tend to move away from the base 422 and approach the first magnetic conductive body 425. The push rod 423 is inserted into the through hole 222 of the first yoke plate 22 and the first hole 4131 of the fixed core 413, and one end of the push rod 423 is fixedly connected to the base 422 and the other end of the push rod 423 is fixedly connected to the movable core 414.

[0379] It should be noted that a spring may be used as the second elastic part 424. The first magnetic conductive body 425 and the second magnetic conductive body 426 may be made of a soft magnetic material such as iron, cobalt, nickel, or an alloy thereof.

[0380] When the push rod 423 is not moving upward, the top surface of the movable contact 32 abuts against the first magnetic conductive body 425 under the action of the second elastic part 424. When the coil 412 is energized and the push rod 423 is driven to move upward, both ends of the movable contact 32 contact the two fixed contact lead ends 31 respectively. After that, the push rod 423 continues to move upward, and the first magnetic conductive body 425 also continues to move upward following the push rod 423, but since the movable contact 32 has already contacted the two fixed contact lead ends 31, the movable contact 32 cannot continue to move upward, realizing the overtravel of the contact. The elastic force from the second elastic part 424 forms a certain gap between the bottom surface of the first magnetic conductive body 425 and the top surface of the movable contact 32, thereby causing a magnetic gap to exist between the first magnetic conductive body 425 and the second magnetic conductive body 426.

[0381] Hereinafter, with reference to Figs. 64 to 70, a different embodiment in which the pressure relief valve assembly 5 is provided in the metal cover 23 will be described.

[0382] As shown in Fig. 64, Fig. 64 is a cross-sectional view of the first embodiment of the present invention after the metal cover 23 and the valve plate 51 are assembled. The metal cover 23 includes a bottom wall 231 and a side wall 232, one end of the side wall 232 is connected to the edge of the bottom wall 231, and the other end extends toward the first yoke plate 22 and is connected to the second side surface 224 of the first yoke plate 22. The pressure relief valve assembly 5 is provided on the bottom wall 231.

[0383] Specifically, the pressure relief hole 221 is provided in the bottom wall 231 of the metal cover 23. The pressure relief valve assembly 5 includes a valve plate 51, which is provided separately from the metal cover 23 and connected to the bottom wall 231 of the metal cover 23 to cover the pressure relief hole 221. When the valve plate 51 is not broken through (i.e., in a normal operating state), the valve plate 51 closes the pressure relief hole 221 and plays a sealing role. When the valve plate 51 is broken through (i.e., in an abnormal operating state), the gas in the driving chamber 24 can be released through the pressure relief hole 221.

[0384] The structural strength of the valve plate 51 is smaller than that of the container 2. When the contact assembly 3 is in an abnormal operating state, the gas whose pressure increases suddenly breaks through the valve plate 51 first and is discharged from the pressure relief hole 221 of the metal cover 23, so that the gas pressure in the container 2 does not continue to increase and the container 2 is protected.

[0385] As an example, the structural strength of the valve plate 51 is smaller than the structural strength of the metal cover 23 .

[0386] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0387] 64, the valve plate 51 is connected to the inner wall surface of the bottom wall 231 and covers the pressure relief hole 221. The valve plate 51 can be connected to the inner wall surface of the bottom wall 231 by a method such as laser welding, brazing, resistance welding, or adhesive.

[0388] As shown in Fig. 65, Fig. 65 is a cross-sectional view of the second embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as the first embodiment and the second embodiment are omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 and covers the pressure relief hole 221.

[0389] The valve plate 51 may be provided on both the inner wall surface and the outer wall surface of the bottom wall 231 .

[0390] As shown in Fig. 66, Fig. 66 is a cross-sectional view of the third embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those of the third embodiment and the above embodiments are omitted, but the difference is that the valve plate 51 is connected to the inner wall surface of the bottom wall 231 via a transition piece 52.

[0391] Specifically, the transition piece 52 has a generally tubular shape, for example, a cylindrical shape. A flange 522 protruding outward along the radial direction is provided at one end of the transition piece 52. The one end of the transition piece 52 is connected to the inner wall surface of the bottom wall 231 via the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51.

[0392] Of course, one end of the transition piece 52 may be connected to the valve plate 51 via a flange 522, and the other end may be connected to the inner wall surface of the bottom wall 231. Alternatively, the transition piece 52 may have a straight structure without a flange. Both ends of the straight transition piece 52 are connected to the bottom wall 231 and the valve plate 51, respectively.

[0393] In addition, the connection between the valve plate 51 and the transition piece 52, and between the transition piece 52 and the bottom wall 231 can be made by laser welding, brazing, resistance welding, adhesives, or the like.

[0394] As shown in Fig. 67, Fig. 67 is a cross-sectional view of the fourth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as in the third embodiment will be omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 via a transition piece 52.

[0395] As shown in Fig. 68, Fig. 68 is a cross-sectional view of the fifth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as the third embodiment will be omitted, but the difference is that the transition piece 52 is one piece, the transition piece 52 has a second perforation 521, and the second perforation 521 is provided corresponding to the pressure relief hole 221.

[0396] As shown in Fig. 69, Fig. 69 is a cross-sectional view of the sixth embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those in the sixth embodiment and the fifth embodiment are omitted, but the difference is that the valve plate 51 is connected to the outer wall surface of the bottom wall 231 via a transition piece 52.

[0397] When the valve plate 51 is provided separately from the bottom wall 231 of the metal cover 23, the valve plate 51 may be provided on the inner wall surface of the bottom wall 231 or on the outer wall surface of the bottom wall 231. When the valve plate 51 is provided on the inner wall surface of the bottom wall 231, the bottom wall 231 provides a supporting force to the valve plate 51, and the gas pressure inside the container 2 can be applied to the first side surface 511 of the valve plate 51 to press the valve plate 51 against the bottom wall 231. When the valve plate 51 is provided on the outer wall surface of the bottom wall 231, the bottom wall 231 cannot provide a supporting force to the valve plate 51, so that a higher requirement is placed on the method of connecting the valve plate 51 and the bottom wall 231.

[0398] As shown in Fig. 70, Fig. 70 is a cross-sectional view of the seventh embodiment of the present invention in which the metal cover 23 and the valve plate 51 are assembled. The same points as those of the seventh embodiment and the above embodiments are omitted, but the difference is that the valve plate 51 is integrally provided on the bottom wall 231 and is used to close or open the pressure relief hole 221.

[0399] Specifically, the bottom wall 231 has an inner wall surface and an outer wall surface, and the valve plate 51 has a first side surface 511 and a second side surface 512 provided on the opposite sides. The first side surface 511 is connected to the hole wall of the pressure relief hole 221, and the second side surface 512 is flush with the outer wall surface of the bottom wall 231.

[0400] The positional relationship between the bottom wall 231 and both side surfaces of the valve plate 21 is such that the first side surface 511 of the valve plate 51 is flush with the inner wall surface of the bottom wall 231 and the second side surface 512 is connected to the hole wall of the pressure relief hole 221, or the first side surface 511 and the inner wall surface of the bottom wall 231 are spaced a fixed distance apart, and the second side surface 512 and the outer wall surface of the bottom wall 231 are spaced a fixed distance apart.

[0401] As shown in Fig. 71, Fig. 71 is a cross-sectional view of a protective cover 53 attached to a metal cover in an embodiment of the present invention. The pressure relief valve assembly 5 further includes a protective cover 53, which is connected to the metal cover 23 and covers the outer surface of the valve plate 51. The protective cover 53 has a vent hole 531, and gas can act on the valve plate 51 through the vent hole 531.

[0402] The protective cover 53 may be provided on the outer wall surface of the metal cover 23 .

[0403] In this embodiment, by adding a protective cover 53, it is possible to prevent gas from breaking through the valve plate 51 in an abnormal operating state, and to protect the valve plate 51 during transportation or installation of the metal cover 23, thereby preventing the valve plate 51 from being broken through by external objects.

[0404] The protective cover 53 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, etc.

[0405] The protective cover 53 can be connected to the metal cover 23 by methods such as laser welding, brazing, resistance welding, adhesive bonding, fastening, etc. As shown in Fig. 72, Fig. 72 is a schematic exploded view of a first embodiment of a housing 1 according to the present invention. The housing 1 according to the embodiment of the present invention includes a first case 11 and a second case 12, the second case 12 is detachably connected to the first case 11, and a vent structure 13 is provided in the first case 11 and / or the second case 12, and the vent structure 13 communicates with a hollow chamber 14.

[0406] By providing the gas venting structure 13, the housing 1 in the embodiment of the present invention has a non-sealed structure, and the gas enters the hollow chamber 14 of the housing 1 after being discharged from the inside of the contact chamber 27 through the pressure relief hole 221, and then is discharged to the outside of the housing 1 through the gas venting structure 13.

[0407] In addition, the housing 1 of the embodiment of the present invention can prevent the gaseous eruptions generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of release, thereby preventing contamination of other electronic components near the relay. Here, the gaseous eruptions are generated by the high-temperature arc ablation and volatilization of the metal material of the contact assembly 3.

[0408] 72, the gas venting structure 13 includes a slit 131, which is formed between the first case 11 and the second case 12. Gas can be discharged from the relay through the slit 131 between the first case 11 and the second case 12.

[0409] In this embodiment, the slit 131 is located at the bottom of the housing 1 .

[0410] As shown in Fig. 73, Fig. 73 is a schematic exploded view of the second embodiment of the housing 1 of the present invention. The same points as the housing 1 of the second embodiment and the housing 1 of the first embodiment are omitted, but the difference is that the slit 131 is located in the central region of the housing 1 in the height direction.

[0411] As shown in Fig. 74, Fig. 74 is a schematic diagram of an exploded view of a third embodiment of a housing 1 according to the present invention. The same points as those of the housing 1 of the third embodiment and the housing 1 of the second embodiment are omitted, but the difference is that the gas vent structure 13 has a slit 131 and a gas vent hole 132, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas vent hole 132 is formed in the second case 12. Gas can be discharged from the relay through the slit 131 and the gas vent hole 132. Of course, the gas vent hole 132 may be provided in the first case 11.

[0412] As shown in Fig. 75, Fig. 75 is a schematic diagram of an exploded view of a fourth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fourth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting cover 133, the slit 131 is formed in the central region in the height direction of the housing 1, the gas venting cover 133 is provided in the first case 11, and the opening of the gas venting cover 133 faces downward. In this way, gas can be discharged from the relay through the slit 131 and the gas venting cover 133, and the gas discharged from the gas venting cover 133 is ejected downward, and does not affect other electronic devices near the relay.

[0413] Of course, the gas vent cover 133 may be provided on the second case 12, or both the first case 11 and the second case 12 are provided with the gas vent cover 133.

[0414] As shown in Fig. 76, Fig. 76 is a schematic exploded view of the fifth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fifth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting grill 134, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas venting grill 134 is provided in the first case 11. Of course, the gas venting grill 134 may be provided in the second case 12, or both the first case 11 and the second case 12 are provided with the gas venting grill 134.

[0415] The gas can be exhausted from the relay through the slits 131 and the gas venting grill 134. When the gas passes through the gas venting grill 134, the gas venting grill 134 can make the gas flow more slowly, and can prevent the exhausted gas from affecting other electronic components near the relay.

[0416] In addition, various examples / embodiments provided by the present invention can be combined with each other without causing a contradiction, and will not be described herein with examples.

[0417] As described above, the advantages and beneficial effects of the relay according to the embodiments of the present invention include at least the following:

[0418] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the metal cover 23 to release over-pressure gas, and further, in the abnormal situation of the contact assembly 3 short circuiting, overload shutdown, etc., the high temperature inside the chamber of the relay will not cause the chamber body to explode and disintegrate, which will increase the reliability of the product.

[0419] In addition, the housing 1 of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the emitted gas in a timely manner and prevent the emitted gas from contaminating other electronic devices.

[0420] Moreover, referring to Figs. 77 to 92, the embodiments of the present invention provide a relay that can improve safety in order to solve the problem of explosion proneness existing in the related art.

[0421] A relay according to an embodiment of the present invention includes a contact container, a contact assembly, and a pressure relief valve assembly, the contact container includes a ceramic cover and a first yoke plate, the ceramic cover and the first yoke plate form a contact chamber, the ceramic cover has a pressure relief hole, the pressure relief hole communicates with the contact chamber, the contact assembly includes a pair of fixed contact pull-out ends and a movable contact, the fixed contact pull-out ends are provided on the ceramic cover, one end of the fixed contact pull-out ends enters the contact chamber, the movable contact is provided in the contact chamber, and is used to contact or separate from the pair of fixed contact pull-out ends by being driven, and the pressure relief valve assembly is provided on the ceramic cover, closes the pressure relief hole when a gas pressure in the contact chamber is lower than a threshold value, and is broken through to open the pressure relief hole when the gas pressure in the contact chamber is equal to or higher than a threshold value.

[0422] According to some embodiments of the present invention, the pressure relief valve assembly includes a valve plate, which is integral with the ceramic cover and is used to close or open the pressure relief hole.

[0423] According to some embodiments of the present invention, the pressure relief valve assembly includes a valve plate that is separate from the ceramic cover, is disposed over the pressure relief hole, and is used to close or open the pressure relief hole.

[0424] According to some embodiments of the present invention, the ceramic cover has an inner wall surface and an outer wall surface, and the valve plate is disposed on the inner wall surface and / or the outer wall surface.

[0425] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the ceramic cover via the transition piece.

[0426] According to some embodiments of the present invention, the pressure relief valve assembly further comprises a protective cover, the protective cover being connected to the ceramic cover and covering an outer surface of the valve plate, the protective cover having an air vent.

[0427] According to some embodiments of the present invention, the ceramic cover comprises a top wall and a side wall; The fixed contact lead end is provided on the top wall, The side wall is provided around an edge of the top wall, extends toward the first yoke plate, and is connected to the first yoke plate; Here, the pressure relief hole is provided in the top wall and / or the side wall.

[0428] According to some embodiments of the present invention, the relay further comprises a housing, the housing having a hollow chamber; The contact vessel and the pressure relief valve assembly are disposed in the hollow chamber.

[0429] According to some embodiments of the present invention, the housing comprises a first case and a second case. A second case is detachably connected to the first case, and a vent structure is provided in the first case and / or the second case, and the vent structure communicates with the hollow chamber.

[0430] According to some embodiments of the present invention, the venting structure comprises a slit, the slit being formed between the first case and the second case.

[0431] According to some embodiments of the present invention, the venting structure comprises a vent hole and / or a vent cover and / or a vent grill.

[0432] According to some embodiments of the invention, the hollow chamber communicates with the exterior of the housing.

[0433] According to some embodiments of the present invention, the structural strength of the pressure relief valve assembly is less than the structural strength of the contact vessel.

[0434] According to some embodiments of the present invention, the contact vessel further comprises a connecting piece, and the ceramic cover is connected to the first yoke plate via the connecting piece.

[0435] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0436] The relay of the embodiment of the present invention is used to release overpressure gas by providing a pressure relief valve assembly on the ceramic cover, and further ensures that under abnormal circumstances such as short circuit or overload interruption of the contact assembly, the relay will not cause the sealed chamber to explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the contact chamber, thus improving the reliability of the product. Another advantage of providing a valve plate on the ceramic cover is that ceramic has the characteristics of high strength and high hardness, which provides a stable and reliable base for the pressure relief valve assembly, so that the pressure relief valve assembly will not be easily distorted due to the deformation of the ceramic cover, and thus avoids premature failure of the pressure relief valve assembly.

[0437] In addition, the housing of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the released gas in a timely manner and prevent the released gas from contaminating other electronic devices.

[0438] As described in the Background Art, in the relay contact system of the related art, at the moment of high current short circuit or overload cutoff, the contact sealing cavity is prone to explosion, which is a safety hazard. The inventors have found in their research that when the contact inside the contact sealing cavity suddenly burns with an arc, high temperature is instantaneously generated inside the sealing cavity, which causes the air pressure inside the contact sealing cavity to instantly and rapidly rise, and when the air pressure strength inside the contact sealing cavity is greater than the strength of the components or the strength of the connection points of the contact sealing cavity, the contact sealing cavity of the relay is prone to explosion.

[0439] As shown in Fig. 77 and Fig. 78, Fig. 77 is a top view of a relay in an embodiment of the present invention. Fig. 78 is a cross-sectional view of FF in Fig. 77. The relay in the embodiment of the present invention includes a housing 1, a contact container 2, a contact assembly 3, a drive assembly 4, and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, and the hollow chamber 14 communicates with the outside of the housing 1. The contact container 2 is provided in the hollow chamber 14, and the contact container 2 includes a ceramic cover 211 and a first yoke plate 22, and the ceramic cover 211 and the first yoke plate 22 form a contact chamber 27. The ceramic cover 211 has a pressure relief hole 221, and the pressure relief hole 221 communicates with the contact chamber 27 and the hollow chamber 14. The contact assembly 3 includes a pair of fixed contact pull-out ends 31 and a movable contact 32. The fixed contact pull-out end 31 is provided in the ceramic cover 211, one end of the fixed contact pull-out end 31 enters the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The movable contact 32 is provided in the contact chamber 27 and is driven to contact or separate from the pair of fixed contact pull-out ends 31. The drive assembly 4 is provided in the hollow chamber 14 and connected to the movable contact 32, and drives the movement of the movable contact 32 to realize contact or separation between both ends of the movable contact 32 and the pair of fixed contact pull-out ends 31. The pressure relief valve assembly 5 is provided in the ceramic cover 211 and is used to close the pressure relief hole 221 when the gas pressure in the contact chamber 27 is lower than a certain threshold, and to break through to open the pressure relief hole 221 when the gas pressure in the contact chamber 27 is equal to or higher than a certain threshold. The structural strength of the pressure relief valve assembly 5 is smaller than that of the contact vessel 2, and in a normal operating state, the maximum value of the intensity of the gas pressure in the contact chamber 27 is smaller than the structural strength of the pressure relief valve assembly 5, and in an abnormal operating state, the maximum value of the intensity of the gas pressure in the contact chamber 27 is greater than the structural strength of the pressure relief valve assembly 5. Note that, in one embodiment, when the pressure relief valve assembly 5 closes the pressure relief hole 221, it maintains the sealing of the contact chamber 27 and ensures the normal operation of the relay.Of course, in other embodiments, when the pressure relief valve assembly 5 closes the pressure relief hole 221, the contact chamber 27 is not absolutely sealed, ensuring that the relay operates normally.

[0440] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed on the ceramic cover 21 to close or open the pressure relief hole 221. When the contact assembly 3 is in a normal operating state, the intensity of the gas pressure in the contact chamber 27 is less than the threshold, so that the pressure relief valve assembly 5 is not broken by the air pressure in the contact chamber 27, and still maintains the pressure relief hole 221 in a closed state, and the relay operates normally. When the contact assembly 3 is in an abnormal operating state, the intensity of the gas pressure in the contact chamber 27 is equal to or greater than the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the contact chamber 27, and the contact chamber communicates with the hollow chamber 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the contact chamber can be released to the hollow chamber 14 through the pressure relief hole 221, and finally released to the outside of the housing 1. That is, in the process of the gradual increase in the intensity of the gas pressure in the contact chamber 27 under abnormal operating conditions, the gas pressure will first break through the pressure relief valve assembly 5, and then the suddenly increased gas pressure will be released through the pressure relief hole 221, so that the air pressure inside the contact chamber 27 will not continue to rise and will not reach the structural strength of the contact vessel 2, thereby avoiding the explosion of the contact vessel 2. Under normal operating conditions, the gas pressure in the contact chamber 27 will not break through the pressure relief valve assembly 5, and the pressure relief valve assembly 5 can still play the role of sealing the pressure relief hole 221.

[0441] The term "normal operating state" means that the relay current is in the rated operating state, and the term "abnormal operating state" means that the contact assembly 3 is in a moment of high current short circuit, overload interruption, etc. The term "threshold" refers to a pressure strength that is slightly larger than the strength of the gas pressure in the contact vessel 2 when the relay is in a normal operating state. Depending on the relay model, the threshold value is also suitable for adjustment, but cannot be larger than the structural strength of the contact vessel 2.

[0442] That is, when the relay is operating normally, the gas pressure in the contact vessel 2 does not reach this threshold and the pressure relief valve assembly 5 is not breached. When the relay is in an abnormal operating state, the gas pressure in the contact vessel 2 is equal to or exceeds this threshold and the pressure relief valve assembly 5 is breached by the gas.

[0443] In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the contact vessel 2. Thus, when the relay is in an abnormal operating state and the gas pressure in the contact vessel 2 gradually increases, the pressure relief valve assembly 5 is breached by the gas before the contact vessel 2 is breached.

[0444] In addition, the design of the pressure relief valve assembly 5 to have a structural strength smaller than that of the contact vessel 2 can be achieved by using different materials and / or structures of the two. For example, when the pressure relief valve assembly 5 and the vessel wall of the contact vessel 2 are made of the same material, the pressure relief valve assembly 5 can be designed to have a thin thickness and be smaller than that of the vessel wall of the contact vessel 2, so that the gas with a gradually increased temperature breaks through the pressure relief valve assembly 5 first. Of course, when the pressure relief valve assembly 5 and the vessel wall of the contact vessel 2 are made of the same thickness, the pressure relief valve assembly 5 can be made of ceramic, while the contact vessel 2 can be made of metal, so that the pressure relief valve assembly 5 breaks through first. Or, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall of the contact vessel 2 is thick and made of metal. Of course, other suitable methods can be adopted to make the structural strength of the pressure relief valve assembly 5 smaller than that of the contact vessel 2, and they will not be listed here.

[0445] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or assemblies inherent to those processes, methods, products or devices.

[0446] In addition, the relay according to the embodiment of the present invention does not include the housing 1, and after assembling the contact container 2, the contact assembly 3, the drive assembly 4, and the pressure relief valve assembly 5, the relay may be directly installed in an application product such as a battery pack, an electrical control box, etc.

[0447] Next, referring to Figs. 77 to 78, the contact assembly 3 includes two fixed contact pull-out ends 31 as current inflow and current outflow, and one movable contactor 32. The movable contactor 32 may be a straight piece, and both ends of the drive assembly 32 can contact the two fixed contact pull-out ends 31 along the longitudinal direction of the movable contactor 32 by the action of the drive assembly 4, respectively, to realize the on-state of the load. The bottom of the fixed contact pull-out end 31 can be a fixed contact, and both ends of the movable contactor 32 in the longitudinal direction can be a movable contact. The movable contacts at both ends of the movable contactor 32 may protrude from other parts of the movable contactor 32, or may be flush with other parts.

[0448] The fixed contact may be provided integrally or separately at the bottom of the fixed contact drawn end 31, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction in which the movable contactor 32 extends.

[0449] The two fixed contact pull-out ends 31 are provided on the ceramic cover 211, for example, on the top of the ceramic cover 211. One end of each fixed contact pull-out end 31 enters the inside of the contact chamber 27, and the other end is exposed from the outer surface of the housing 1. The one end of the fixed contact pull-out end 31 that enters the inside of the contact chamber 27 is used to contact the movable contact 32.

[0450] The relay also comprises an arc-extinguishing unit 7 mounted in the hollow chamber 14 of the housing 1 for extinguishing the arc of the contact assembly 3 .

[0451] In this embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The arc-extinguishing magnets 71 may be permanent magnets, and each of the arc-extinguishing magnets 71 may be substantially rectangular. The two arc-extinguishing magnets 71 are provided on both sides of the contact vessel 2, respectively, and are provided facing each other along the longitudinal direction of the movable contactor 32.

[0452] As shown in Fig. 78, the two arc-extinguishing magnets 71 are located on both the left and right sides of the ceramic cover 211. In this embodiment, the polarities of the opposing faces of the two arc-extinguishing magnets 71 are opposite. That is, the left face of the arc-extinguishing magnet 71 located on the left side of the contact vessel 2 is an S pole and the right face is an N pole, and the left face of the arc-extinguishing magnet 71 located on the right side of the contact vessel 2 is an S pole and the right face is an N pole.

[0453] Of course, the polarity of the opposing surfaces of the two arc-extinguishing magnets 71 can also be designed to be the same; for example, the left surface of the arc-extinguishing magnet 71 located on the left side of the ceramic cover 211 has a south pole and the right surface has a north pole, and the left surface of the arc-extinguishing magnet 71 located on the right side of the ceramic cover 211 has a north pole and the right surface has a south pole.

[0454] In this way, by providing two arc-extinguishing magnets 71 arranged opposite to each other, a magnetic field can be formed around the contact assembly 3. Therefore, the arcs generated between the fixed contact pull-out end 31 and the movable contactor 32 are stretched in directions away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0455] The arc-extinguishing unit 7 further includes two yoke clips 72 arranged corresponding to the positions of the two arc-extinguishing magnets 71. The two yoke clips 72 surround the contact container 2 and the two arc-extinguishing magnets 71. The design of the yoke clips 72 surrounding the arc-extinguishing magnets 71 can prevent the magnetic field generated by the arc-extinguishing magnets 71 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clips 72 are made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0456] The contact vessel 2 includes a first yoke plate 22, a ceramic cover 211, and a connecting part 212. The first yoke plate 22 is provided in the hollow chamber 14, and includes a first side surface 223 and a second side surface 224 provided on opposite sides, and a through hole 222, and the through hole 222 passes through the first side surface 223 and the second side surface 224.

[0457] The ceramic cover 211 is connected to the first side surface 223 of the first yoke plate 22 via the connecting part 212, and covers the through hole 222. The ceramic cover 211, the connecting part 212, and the first yoke plate 22 are enclosed together as the contact chamber 27, which penetrates the through hole 222, and is used to accommodate a part of the fixed contact lead end 31 and the movable contact 32.

[0458] The relay further includes a metal cover 23, which is connected to the second side 224 of the first yoke plate 22 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 form a driving chamber 24, which communicates with the through hole 222 and is used to accommodate a fixed core 413 and a movable core 414, as described below. The contact chamber 27 communicates with the driving chamber 24 via the through hole 222. In this embodiment, the contact chamber 27 and the driving chamber 24 communicate with each other to form a sealed chamber.

[0459] The ceramic cover 211 is connected to the first yoke plate 22 via a connecting part 212. Specifically, the connecting part 212 may have an annular structure, and one end of the connecting part 212 may be connected to an opening edge of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesion, or the like. The other end of the connecting part 212 is connected to a first side surface 223 of the first yoke plate 22, and may be similarly connected by laser welding, brazing, resistance welding, adhesion, or the like. The connecting part 212 is provided between the ceramic cover 211 and the first yoke plate 22, and can facilitate the connection between the ceramic cover 211 and the first yoke plate 22.

[0460] 78, the drive assembly 4 includes an electromagnet unit 41 and a push rod unit 42. The electromagnet unit 41 is disposed on the side of the first yoke plate 22 away from the ceramic cover 211. The push rod unit 42 is drivingly connected to the electromagnet unit 41. The push rod unit 42 is movably provided in the drive chamber 24 and connected to the movable contact 32 through the through hole 222.

[0461] When the electromagnet unit 41 is energized, it can drive and move the push rod unit 42 , which can then move the movable contact 32 to bring it into contact with or away from the fixed contact drawn-out end 31 .

[0462] The electromagnet unit 41 includes a coil bobbin 411, a coil 412, a fixed core 413, and a movable core 414. The coil bobbin 411 is hollow and made of an insulating material. The metal cover 23 is provided in the coil bobbin 411. The coil surrounds the coil bobbin 411. The fixed core 413 is fixed in the metal cover 23, and a part of the fixed core 413 enters the through hole 222. The fixed core 413 has a first hole 4131 provided in correspondence with the position of the through hole 222 for the push rod unit 42 to be provided. The movable core 414 is provided movably in the metal cover 23 and is provided opposite the fixed core 413. The movable core 414 is connected to the push rod unit 42, and is used to be attracted to the fixed core 413 when the coil 412 is energized. The armature 414 and the push rod unit 42 may be connected by threads, caulking, welding, or other methods.

[0463] In this embodiment, the coil bobbin 411 is made of a resin material and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are provided on both ends of the hollow cylindrical portion 4112. The coil 412 surrounds the outer periphery of the hollow cylindrical portion 4112. The metal cover 23 is drilled into the hollow cylindrical portion 4112.

[0464] The electromagnet unit 41 further includes a first elastic part 415, which is located inside the metal cover 23 and disposed between the fixed core 413 and the movable core 414, and is used to reset the movable core 414 when the power supply to the coil 412 is cut off. The first elastic part 415 may be a spring, and may be sleeved on the outside of the push rod unit 42.

[0465] The relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 and the first yoke plate 22 are provided opposite to each other, and the coil bobbin 411 is provided between the first yoke plate 22 and the second yoke plate 25. That is, the first yoke plate 22 is connected to a first flange portion 4111 of the coil bobbin 411, and the second yoke plate 25 is connected to a second flange portion 4113 of the coil bobbin 411.

[0466] A pair of third yoke plates 26 are respectively provided at both ends along the longitudinal direction of the movable contactor 32 of the second yoke plate 25, extend in the direction of the first yoke plate 22, and are connected to both ends along the longitudinal direction of the movable contactor 32 of the first yoke plate 22.

[0467] In this manner, the first yoke plate 22 , the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412 .

[0468] The second yoke plate 25 and the pair of third yoke plates 26 can be formed as an integral structure by, for example, bending. The second yoke plate 25 formed integrally with the first yoke plate 22 and the pair of third yoke plates 26 may be formed as separate structures.

[0469] The relay also includes a magnetically conductive bushing 416 made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof. The magnetically conductive bushing 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the coil bobbin 411 and the outer peripheral surface of the metal cover 23. In this manner, the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the fixed core 413, the movable core 414, and the magnetically conductive bushing 416 together form a magnetic path.

[0470] The push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixed sheet 427, a push rod 423, a second elastic part 424, a first magnetic conductive body 425, and a second magnetic conductive body 426. The first magnetic conductive body 425 is fixedly connected to the U-shaped bracket 421, and the first magnetic conductive body 425 is provided on the inner surface of the U-shaped bracket 421. The second magnetic conductive body 426 is fixedly connected to the movable contact 32. The base 422, the fixed sheet, and the upper part of the push rod 423 can be integrally molded by injection molding.

[0471] The bottom of the U-shaped bracket 421 is fixedly connected to the fixed sheet 427, the U-shaped bracket 421 and the base 422 are surrounded by a frame structure, and the movable contact 32, the first magnetic conductive body 425, and the second magnetic conductive body 426 are attached in the frame structure surrounded by the U-shaped bracket 421 and the base 422. Furthermore, the second elastic part 424 is also provided in the frame structure surrounded by the U-shaped bracket 421 and the base 422, one end of the second elastic part 424 abuts on the base 422 and the other end abuts on the movable contact 32, and the second elastic part 424 can provide an elastic force such that the movable contact 32 and the second magnetic conductive body 426 tend to move away from the base 422 and approach the first magnetic conductive body 425. The push rod 423 is inserted into the through hole 222 of the first yoke plate 22 and the first hole 4131 of the fixed core 413, and one end of the push rod 423 is fixedly connected to the base 422 and the other end of the push rod 423 is fixedly connected to the movable core 414.

[0472] It should be noted that a spring may be used as the second elastic part 424. The first magnetic conductive body 425 and the second magnetic conductive body 426 may be made of a soft magnetic material such as iron, cobalt, nickel, or an alloy thereof.

[0473] When the push rod 423 is not moving upward, the top surface of the movable contact 32 abuts against the first magnetic conductive body 425 under the action of the second elastic part 424. When the coil 412 is energized and the push rod 423 is driven to move upward, both ends of the movable contact 32 contact the two fixed contact lead ends 31 respectively. After that, the push rod 423 continues to move upward, and the first magnetic conductive body 425 also continues to move upward following the push rod 423, but since the movable contact 32 has already contacted the two fixed contact lead ends 31, the movable contact 32 cannot continue to move upward, realizing the overtravel of the contact. The elastic force from the second elastic part 424 forms a certain gap between the bottom surface of the first magnetic conductive body 425 and the top surface of the movable contact 32, thereby causing a magnetic gap to exist between the first magnetic conductive body 425 and the second magnetic conductive body 426.

[0474] As shown in Figure 79, Figure 79 is a schematic diagram of an exploded view of a relay in an embodiment of the present invention. In this embodiment, the pressure relief valve assembly 5 is provided in the ceramic cover 211.

[0475] In one embodiment, the pressure relief valve assembly 5 includes a valve plate 51 that is separate from the ceramic cover 211 and is used to close or open the pressure relief hole 221 .

[0476] The structural strength of the valve plate 51 is smaller than that of the contact vessel 2. When the contact assembly 3 is in an abnormal operating state, the gas whose pressure increases suddenly breaks through the valve plate 51 first and is discharged from the pressure relief hole 221 of the ceramic cover 211, so that the gas pressure in the contact vessel 2 does not continue to increase and the contact vessel 2 is protected.

[0477] The valve plate 51 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, etc.

[0478] Of course, the valve plate 51 may be integrally provided with the ceramic cover 211 and used to close or open the pressure relief hole 221. When the valve plate 51 and the ceramic cover 211 are an integral structure, both the valve plate 51 and the ceramic cover 211 are made of a ceramic material.

[0479] As shown in Fig. 80, Fig. 80 is a cross-sectional view of the ceramic cover 211 and the valve plate 51 after assembly in the first embodiment of the present invention. In this embodiment, the ceramic cover 211 has a top wall 2111 and a side wall 2112, the fixed contact pull-out end 31 is provided on the top wall 2111, and the pressure relief hole 221 is provided on the top wall 2111. The side wall 2112 is provided around the edge of the top wall 2111, extends toward the first yoke plate 22, and is connected to the connecting part 212. The valve plate 51 is provided on the top wall 2111 and covers the pressure relief hole 221.

[0480] The valve plate 51 may be provided on the inner wall surface of the ceramic cover 211 or on the outer wall surface of the ceramic cover 211 .

[0481] It should be noted that the valve plate 51 can be connected to the top wall 2111 of the ceramic cover 211 by laser welding, brazing, resistance welding, adhesives, and the like.

[0482] As shown in Fig. 81, Fig. 81 is a cross-sectional view of the ceramic cover 211 and the valve plate 51 in the second embodiment of the present invention after assembly. The same points as those in the second embodiment and the above embodiments are omitted, but the difference is that the pressure relief valve assembly 5 further includes a transition piece 52, and the valve plate 51 is connected to the ceramic cover 211 via the transition piece 52.

[0483] In this embodiment, the transition piece 52 may be one piece.

[0484] The transition piece 52 has a second perforation 521 opening in the thickness direction, and the second perforation 521 communicates with the pressure relief hole 221. The valve plate 51 is connected to the transition piece 52 and covers the second perforation 521. In a normal operating state, the valve plate 51 closes the second perforation 521 and the pressure relief hole 221 to keep the contact chamber 27 sealed. In an abnormal operating state, the valve plate 51 is broken through by the gas, and the contact chamber 27 communicates with the outside through the second perforation 521 and the pressure relief hole 221.

[0485] The connection between the valve plate 51 and the transition piece 52, and between the transition piece 52 and the ceramic cover 211 can be made by a method such as laser welding, brazing, resistance welding, or adhesive.

[0486] In this embodiment, both the valve plate 51 and the transition piece 52 are mounted on the outer wall surface of the ceramic cover 211. Of course, in other embodiments, the valve plate 51 and the transition piece 52 may be mounted on the inner wall surface of the ceramic cover 211.

[0487] As shown in Fig. 82 to Fig. 84, Fig. 82 is a cross-sectional view of ceramic cover 211 and valve plate 51 after assembly in a third embodiment of the present invention. Fig. 83 is a cross-sectional view of ceramic cover 211 and valve plate 51 after assembly in a fourth embodiment of the present invention. Fig. 84 is a cross-sectional view of ceramic cover 211 and valve plate 51 after assembly in a fifth embodiment of the present invention.

[0488] The points which are the same as the second embodiment and the third to fifth embodiments are omitted, but the difference is the shape of the transition piece 52.

[0489] 82, the transition piece 52 in the third embodiment has a substantially tubular shape, for example, a cylindrical shape. A flange 522 protruding outward along the radial direction is provided at one end of the transition piece 52. The one end of the transition piece 52 is connected to the ceramic cover 211 via the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51.

[0490] As shown in FIG. 83, the transition piece 52 in the fourth embodiment has an approximately cylindrical shape, where one end of the transition piece 52 is connected to the valve plate 51 via a flange 522, and the other end is connected to the ceramic cover 211.

[0491] 84, the transition piece 52 in the fifth embodiment has a straight structure without a flange. Both ends of the straight transition piece 52 are connected to the ceramic cover 211 and the valve plate 51, respectively.

[0492] As shown in Figures 85 and 86, Figure 85 is a perspective view of the ceramic cover 211 and the valve plate 51 after assembly in the sixth embodiment of the present invention. Figure 86 is a perspective view of the ceramic cover 211 and the valve plate 51 after assembly in the seventh embodiment of the present invention. Points that are the same as the sixth and seventh embodiments and the above embodiments will be omitted, but the difference is that the pressure relief valve assembly 5 is provided on the side wall 2112 of the ceramic cover 211.

[0493] In this embodiment, the first side wall 2112 of the ceramic cover 211 forms a substantially rectangular parallelepiped structure, where the pressure relief valve assembly 5 may be provided on a long side of the rectangular parallelepiped structure (FIG. 85) or on a wide side of the rectangular parallelepiped structure (FIG. 86).

[0494] As shown in Fig. 87, Fig. 87 is a cross-sectional view of a protective cover 53 attached to a ceramic cover in an embodiment of the present invention. The pressure relief valve assembly 5 further includes a protective cover 53, which is connected to the ceramic cover 211 and covers the outer surface of the valve plate 51. The protective cover 53 has a vent hole 531, and gas can act on the valve plate 51 through the vent hole 531.

[0495] The protective cover 53 may be provided on the outer wall surface of the ceramic cover 211 .

[0496] In this embodiment, the addition of the protective cover 53 prevents gas from breaking through the valve plate 51 in an abnormal operating state, and protects the valve plate 51 during transportation or installation of the ceramic cover 211, thereby preventing the valve plate 51 from being broken through by external objects.

[0497] The protective cover 53 may be made of a metallic material or a non-metallic material. Metallic materials include, but are not limited to, iron-nickel and its alloy materials, copper and its alloys, aluminum and its alloys, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, etc.

[0498] The protective cover 53 can be connected to the ceramic cover 211 by methods such as laser welding, brazing, resistance welding, adhesive bonding, fastening, etc. As shown in Fig. 88, Fig. 88 is a schematic diagram of an exploded view of a first embodiment of a housing 1 in the present invention. The housing 1 in the embodiment of the present invention includes a first case 11 and a second case 12, the second case 12 is detachably connected to the first case 11, and a vent structure 13 is provided in the first case 11 and / or the second case 12, and the vent structure 13 communicates with a hollow chamber 14.

[0499] By providing the gas venting structure 13, the housing 1 in the embodiment of the present invention has a non-sealed structure, and the gas enters the hollow chamber 14 of the housing 1 after being discharged from the inside of the contact chamber 27 through the pressure relief hole 221, and then is discharged to the outside of the housing 1 through the gas venting structure 13.

[0500] In addition, the housing 1 of the embodiment of the present invention can prevent the gaseous eruptions generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of release, thereby preventing contamination of other electronic components near the relay. Here, the gaseous eruptions are generated by the high-temperature arc ablation and volatilization of the metal material of the contact assembly 3.

[0501] 88, the gas venting structure 13 includes a slit 131, which is formed between the first case 11 and the second case 12. Gas can be discharged from the relay through the slit 131 between the first case 11 and the second case 12.

[0502] In this embodiment, the slit 131 is located at the bottom of the housing 1 .

[0503] As shown in Fig. 89, Fig. 89 is a schematic exploded view of the second embodiment of the housing 1 of the present invention. The same points as the housing 1 of the second embodiment and the housing 1 of the first embodiment are omitted, but the difference is that the slit 131 is located in the central region of the housing 1 in the height direction.

[0504] As shown in Fig. 90, Fig. 90 is a schematic exploded view of the third embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the third embodiment and the housing 1 of the second embodiment are omitted, but the difference is that the gas vent structure 13 has a slit 131 and a gas vent hole 132, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas vent hole 132 is formed in the second case 12. Gas can be discharged from the relay through the slit 131 and the gas vent hole 132. Of course, the gas vent hole 132 may be provided in the first case 11.

[0505] As shown in Fig. 91, Fig. 91 is a schematic diagram of an exploded view of a fourth embodiment of the housing 1 of the present invention. The same points as those of the housing 1 of the fourth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting cover 133, the slit 131 is formed in the central region in the height direction of the housing 1, the gas venting cover 133 is provided in the first case 11, and the opening of the gas venting cover 133 faces downward. In this way, gas can be discharged from the relay through the slit 131 and the gas venting cover 133, and the gas discharged from the gas venting cover 133 is ejected downward, and does not affect other electronic devices near the relay.

[0506] Of course, the gas vent cover 133 may be provided on the second case 12, or both the first case 11 and the second case 12 are provided with the gas vent cover 133.

[0507] As shown in Fig. 92, Fig. 92 is a schematic diagram of an exploded view of a fifth embodiment of a housing 1 according to the present invention. The same points as those of the housing 1 of the fifth embodiment and the housing 1 of the above embodiments are omitted, but the difference is that the gas venting structure 13 includes a slit 131 and a gas venting grill 134, the slit 131 is formed in the central region in the height direction of the housing 1, and the gas venting grill 134 is provided in the first case 11. Of course, the gas venting grill 134 may be provided in the second case 12, or both the first case 11 and the second case 12 are provided with the gas venting grill 134.

[0508] The gas can be exhausted from the relay through the slits 131 and the gas venting grill 134. When the gas passes through the gas venting grill 134, the gas venting grill 134 can make the gas flow more slowly, and can prevent the exhausted gas from affecting other electronic components near the relay.

[0509] In addition, various examples / embodiments provided by the present invention can be combined with each other without causing a contradiction, and will not be described herein with examples.

[0510] As described above, the advantages and beneficial effects of the relay according to the embodiments of the present invention include at least the following:

[0511] In the relay of the embodiment of the present invention, the pressure relief valve assembly 5 is installed in the ceramic cover 211 to release over-pressure gas, and further, under abnormal circumstances such as short circuit or overload shutdown of the contact assembly 3, the high temperature inside the chamber of the relay will not cause the chamber body to explode and disintegrate, thereby improving the reliability of the product.

[0512] In addition, the housing 1 of the relay in the embodiment of the present invention is designed as a non-sealed structure, which can discharge the emitted gas in a timely manner and prevent the emitted gas from contaminating other electronic devices.

[0513] In the embodiments of the invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not understood to indicate or imply relative importance, and terms such as "attached", "connected", "contacted", and "fixed" should be understood broadly. For example, "connected" may be a fixed connection, a detachable connection, or an integral connection. "Connected" may be a direct connection or an indirect connection via an intermediate medium. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to the specific circumstances.

[0514] In describing the embodiments of the present invention, the orientations or positional relationships indicated by the terms "up," "down," "left," "right," "front," "rear," etc. are based on the orientations or positional relationships shown in the figures, and are merely intended to facilitate the explanation and simplification of the embodiments of the present invention, and do not indicate or imply that the referred devices or units must be configured and operated in a particular orientation, and should not be understood as limitations on the embodiments of the invention.

[0515] In the description herein, the term "one embodiment," "some embodiments," "particular embodiments," and the like means that the particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, general expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0516] The above is only a preferred embodiment of the invention, and is not used to limit the invention, and those skilled in the art can make various modifications and changes to the invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. 1. A relay comprising a contact receptacle, a contact assembly, and a pressure relief valve assembly, The contact vessel includes a ceramic cover and a first yoke plate, the ceramic cover and the first yoke plate forming a contact chamber, the ceramic cover has a pressure relief hole, and the pressure relief hole is in communication with the contact chamber; The contact assembly includes a pair of fixed contact pull-out ends and a movable contact, the fixed contact pull-out ends are provided on the ceramic cover, one end of the fixed contact pull-out ends enters the contact chamber, and the movable contact is provided in the contact chamber and is used to contact or separate from the pair of fixed contact pull-out ends by being driven; The pressure relief valve assembly is provided in the ceramic cover and is broken to open the pressure relief hole when the gas pressure in the contact chamber is equal to or greater than a threshold value. relay.

2. 2. The relay according to claim 1, wherein the pressure relief valve assembly comprises a valve plate, the valve plate being integral with the ceramic cover and used to close or open the pressure relief hole.

3. 2. The relay according to claim 1, wherein the pressure relief valve assembly comprises a valve plate, the valve plate being provided separately from the ceramic cover, the valve plate being provided in the pressure relief hole, and being used to close or open the pressure relief hole.

4. 4. The relay according to claim 3, wherein the ceramic cover has an inner wall surface and an outer wall surface, and the valve plate is provided on the inner wall surface and / or the outer wall surface.

5. 4. The relay of claim 3, wherein the pressure relief valve assembly further comprises a transition piece, the valve plate being connected to the ceramic cover through the transition piece.

6. The relay according to any one of claims 2 to 5, wherein the pressure relief valve assembly further comprises a protective cover, the protective cover being connected to the ceramic cover and covering an outer surface of the valve plate, the protective cover having an air vent.

7. The ceramic cover includes a top wall and a side wall. The fixed contact lead end is provided on the top wall, The side wall is provided around an edge of the top wall, extends toward the first yoke plate, and is connected to the first yoke plate; The pressure relief hole is provided in the top wall and / or the side wall.

2. The relay of claim 1.

8. The relay further comprises a housing, the housing having a hollow chamber; The contact vessel and the pressure relief valve assembly are provided in the hollow chamber.

2. The relay of claim 1.

9. The housing includes a first case and a second case. a second case is detachably connected to the first case, a gas vent structure is provided in the first case and / or the second case, and the gas vent structure is in communication with the hollow chamber.

9. The relay of claim 8.

10. The relay of claim 9 , wherein the venting structure comprises a slit, the slit being formed between the first case and the second case.

11. The relay according to claim 9 , characterized in that the venting structure comprises a venting hole and / or a venting cover and / or a venting grill.

12. 10. A relay as claimed in claim 8 or 9, characterized in that the hollow chamber communicates with the outside of the housing.

13. 2. The relay of claim 1, wherein the structural strength of the pressure relief valve assembly is less than the structural strength of the contact vessel.

14. The relay according to claim 1 , wherein the contact container further comprises a connection part, and the ceramic cover is connected to the first yoke plate via the connection part.

15. the pressure relief valve assembly includes a valve plate, the valve plate being disposed at the pressure relief hole and used to close or open the pressure relief hole; the valve plate is made of ceramics; The thickness of the valve plate is smaller than the thickness of the ceramic cover.

2. The relay of claim 1.

16. 2. The relay of claim 1, wherein the pressure relief valve assembly is of a different material and / or structure than the contact chamber.

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