Electromagnetic switch and charging device

Abstract

The embodiment of the utility model provides an electromagnetic switch and charging equipment, relates to the technical field of electronic equipment, and is used for solving the problem that the insulation failure risk of the electromagnetic switch is too high. A first shell of the electromagnetic switch comprises a first end face, and the first end face comprises a first hole. The second shell is arranged around the peripheral face of the first shell, and the surface, facing the first end face, of the second shell comprises a second hole. One end of the first static contact penetrates through the first hole and the second hole and extends out of the second shell, and the other end of the first static contact and the first moving contact are located in the first shell. The first moving contact is used for being in contact with or disconnected from the first static contact. Wherein the first shell and the second shell are both insulating shells, the second shell comprises protrusions arranged around the second hole by one circle, and the protrusions are arranged on the inner wall face of the second shell in a protruding mode. And the bulge can play an insulation protection role on the periphery of the first static contact, so that the insulation failure risk of the electromagnetic switch is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to an electromagnetic switch and a charging device. Background Technology

[0002] Electromagnetic switches are important units for power switching and electrical isolation, and are widely used in industrial equipment, electric vehicles, charging piles and other equipment. Their working principle is to switch the circuit by controlling the closing and opening of the stationary contact and the moving contact.

[0003] In related technologies, electromagnetic switches, such as contactors, include a housing and a ceramic housing within the housing. The moving contact is located inside the ceramic housing, while one end of the stationary contact protrudes from the housing, and the other end extends through the housing into the ceramic housing. When the electromagnetic switch is in the closed state, the stationary and moving contacts are in contact, and the circuit is open. When the electromagnetic switch is in the open state, the stationary and moving contacts separate, and the circuit is closed.

[0004] To ensure insulation, insulating adhesive is applied to the inner wall of the mounting hole for the stationary contact on the ceramic housing and to the surface of the stationary contact extending out of the ceramic housing, forming an insulating adhesive layer around the stationary contact. In practical applications, the insulating adhesive may be applied unevenly, and during installation, the stationary contact and the housing may damage the insulating adhesive layer, resulting in poor uniformity. In areas where the insulating adhesive layer is thin, the edge of the stationary contact may be exposed, thus posing a higher risk of insulation failure to the electromagnetic switch. Utility Model Content

[0005] This application provides an electromagnetic switch and a charging device to reduce the risk of insulation failure of the electromagnetic switch.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A first aspect of this application provides an electromagnetic switch comprising a first housing, a second housing, a first stationary contact, and a first moving contact. The first housing includes a first end face with a first hole. The second housing is disposed around the outer peripheral surface of the first housing, and the surface of the second housing facing the first end face includes a second hole. One end of the first stationary contact extends outside the second housing through the first and second holes, while the other end of the first stationary contact and the first moving contact are located inside the first housing. The first moving contact is used to contact or disconnect from the first stationary contact.

[0008] Both the first housing and the second housing are insulating housings. The second housing includes a protrusion arranged around the second hole, which protrudes from the inner wall surface of the second housing.

[0009] In the electromagnetic switch provided in this application, the first moving contact is in contact with the first stationary contact, enabling the first moving contact and the first stationary contact to conduct, thereby allowing current to be transmitted between the first moving contact and the first stationary contact. When the first moving contact is separated from the first stationary contact, the electrical connection between the first stationary contact and the first moving contact is broken, and current cannot be transmitted between the first moving contact and the first stationary contact.

[0010] The first stationary contact and the first moving contact are conductive, therefore they need to be insulated from other conductive components of the electromagnetic switch (such as magnets). Since the first housing is an insulating housing, it ensures that the portion of the first moving contact and the first stationary contact located inside the first housing is insulated from other conductive components located outside the first housing.

[0011] One end of the first stationary contact extends outside the second housing through the first and second holes, while the other end is located inside the first housing. This can be understood as the first stationary contact portion being located between the first and second housings. To ensure insulation between the multiple first stationary contacts and between the first stationary contacts and other conductive devices (e.g., other devices located between the first and second housings), a protrusion on the second housing is arranged around the second hole. This can be understood as a ring-shaped protrusion surrounding the outer circumference of the first stationary contact (the portion located between the first and second housings). The ring-shaped protrusion provides insulation protection around the outer circumference of the first stationary contact, increases the creepage distance, and enhances the insulation performance between multiple first stationary contacts or between the first stationary contact and other conductive devices, thereby reducing the occurrence of electrical faults such as arc discharge and short circuits, and lowering the risk of insulation failure of the electromagnetic switch.

[0012] Compared to the existing technology of coating the inner wall of the first hole and the first end face with insulating adhesive, the annular protrusion provided in this application can withstand greater external force and impact while ensuring insulation performance. The insulation reliability between the first stationary contacts and between the first stationary contacts and other conductive devices is higher, thus reducing the risk of insulation failure of the electromagnetic switch.

[0013] In one embodiment, the end of the protrusion near the first housing abuts against the first end face.

[0014] This reduces the gap between the protrusion and the first end face, thereby lowering the risk of short circuits (current concentrating and storing electrical energy in the gap, leading to a short circuit) between the first stationary contact and other conductive devices, and improving the insulation performance of the electromagnetic switch.

[0015] In some embodiments, the surface of the protrusion near the first housing abuts against the first end face, reducing the gap between the protrusion and the first end face through surface contact, thereby further reducing the risk of short circuits between the first stationary contact and other conductive devices.

[0016] In one embodiment, the electromagnetic switch further includes an insulating layer disposed within the gap between the first end face, the protrusion, and the first stationary contact.

[0017] This can be understood as follows: from the radial direction outwards from the first stationary contact, there are successively an insulating adhesive layer (first-level insulation protection) and a protrusion (second-level insulation protection). Therefore, by setting the insulating adhesive layer, on the one hand, it can provide insulation protection for the first stationary contact, thereby enhancing its insulation performance. On the other hand, the insulating adhesive layer is formed by the curing of insulating adhesive, and the cured insulating adhesive layer can fill the gap between the protrusion and the first end face, further increasing the insulation protection effect and reducing the risk of insulation failure.

[0018] In some embodiments, the insulating adhesive layer is annular. The annular insulating adhesive layer can form a continuous barrier around the outer periphery of the first stationary contact, enhancing the insulation performance between the first stationary contact and other conductive devices, and preventing electrical faults such as arc discharge and short circuits.

[0019] In one embodiment, the first end face includes a groove recessed into the first end face, and one end of the protrusion near the first housing extends into the groove.

[0020] After the first and second housings are assembled, there is a large gap between the protrusion and the first end face. This will reduce the insulation protection effect on the one hand, and cause the insulating adhesive to flow into the first and second housings along the gap between the protrusion and the first end face during the injection process, resulting in loss.

[0021] By having one end of the protrusion near the first housing extend into the groove, the gap between the protrusion and the first end face can be reduced after the first and second housings are assembled, thus reducing the loss of insulating adhesive while ensuring insulation protection. Furthermore, the protrusion extending into the groove serves as a positioning limit, ensuring the protrusion is installed correctly. The structure is simple and easy to operate.

[0022] In one embodiment, the groove is arranged around the first hole.

[0023] This can be understood as follows: the groove is an annular groove surrounding the first hole. Since the protrusion is an annular protrusion, the annular groove facilitates the insertion of the protrusion into the annular groove, reducing assembly difficulty.

[0024] In some embodiments, insulating adhesive is injected into the groove, and after curing, it forms an insulating adhesive layer. The groove is an annular groove, which allows the insulating adhesive layer contained in the groove to be an annular insulating adhesive layer. The annular insulating adhesive layer is disposed around the first stationary contact, which can form a continuous barrier on the outer periphery of the first stationary contact, enhancing the insulation performance between the first stationary contact and other conductive devices, and preventing electrical faults such as arc discharge and short circuits.

[0025] In one embodiment, the inner diameter of the second hole facing the first end face is larger than the inner diameter of the first hole.

[0026] This allows for a certain distance between the inner wall of the second hole and the outer circumferential surface of the first stationary contact, resulting in a suitable size for the insulating adhesive layer in the radial direction of the first stationary contact, thereby providing sufficient electrical insulation protection while reducing the cost of the insulating adhesive layer.

[0027] In this embodiment, the dimensions of the insulating adhesive layer in the radial direction of the first stationary contact can be selectively designed according to factors such as the voltage level of the positive input stationary contact.

[0028] In one embodiment, the inner diameter of the second hole facing the first end face is smaller than the inner diameter of the second hole facing away from the first end face.

[0029] This approach allows for the inclusion of more insulating adhesive, enhancing the insulation effect. Furthermore, it enables more stable injection flow and speed of the insulating adhesive, thereby improving the uniformity and consistency of the adhesive layer and reducing the risk of insulation failure.

[0030] In addition, it provides sufficient space for the dispensing device, thus facilitating automated dispensing.

[0031] In one embodiment, the electromagnetic switch includes a contactor or a relay.

[0032] Electromagnetic switches come in various forms; for example, in some embodiments, they include contactors, such as DC contactors. The above configuration reduces the risk of contactor insulation failure.

[0033] For example, in some embodiments, the electromagnetic switch includes a relay. This configuration reduces the risk of insulation failure of the relay.

[0034] A second aspect of this application provides a charging device, which includes a power conversion device and the aforementioned electromagnetic switch, wherein the electromagnetic switch is connected to the input or output terminal of the power conversion device.

[0035] In some scenarios, electromagnetic switches are connected to the output of power conversion devices. Electromagnetic switches are used to control the connection / disconnection of the circuit between the output of the power conversion device and external structures (such as charging terminals, charging guns, etc.).

[0036] In some scenarios, electromagnetic switches are connected to the input terminal of a power conversion device. These switches are used to control the connection / disconnection of the circuit between the power conversion device's input terminal and external structures (such as the power grid, solar energy storage systems, etc.).

[0037] The charging device provided in this application includes the aforementioned electromagnetic switch. Therefore, the charging device provided in this application and the electromagnetic switch of the aforementioned technical solution can solve the same technical problem and have the same technical effect, which will not be elaborated here.

[0038] In one embodiment, the charging device includes a charging gun, and the first stationary contact includes a plurality of first stationary contacts, including a positive input stationary contact, a positive output stationary contact, a negative input stationary contact, and a negative output stationary contact.

[0039] The positive input stationary contact is connected to the positive output terminal of the power conversion device, the positive output stationary contact is connected to the positive input terminal of the charging gun, the negative input stationary contact is connected to the negative output terminal of the power conversion device, and the negative output stationary contact is connected to the negative input terminal of the charging gun.

[0040] When the positive input and output stationary contacts of the electromagnetic switch are connected, the positive output terminal of the power conversion device is electrically connected to the positive input terminal of the charging gun. When the positive input and output stationary contacts of the electromagnetic switch are disconnected, the electrical connection between the positive output terminal of the power conversion device and the positive input terminal of the charging gun is broken. When the negative input and output stationary contacts of the electromagnetic switch are connected, the negative output terminal of the power conversion device is electrically connected to the negative output terminal of the charging gun. When the negative input and output stationary contacts of the electromagnetic switch are disconnected, the electrical connection between the negative output terminal of the power conversion device and the negative output terminal of the charging gun is broken.

[0041] Compared to a scheme that uses an electromagnetic switch between the positive output terminal of the power conversion device and the positive input terminal of the charging gun, and between the negative output terminal of the power conversion device and the negative input terminal of the charging gun, the electromagnetic switches provided in this application can control the on / off state of the connection between the positive output terminal of the power conversion device and the positive input terminal of the charging gun, as well as the connection between the negative output terminal of the power conversion device and the negative input terminal of the charging gun. This reduces the number of parts and simplifies the assembly process. Furthermore, the reduced number of parts in the charging device reduces potential points of failure and maintenance difficulty, lowering the probability of failure and simplifying maintenance, thereby increasing mechanical lifespan. Additionally, the reduced number of parts in the charging device also helps to reduce its size, weight, and cost.

[0042] In one embodiment, the charging device includes a power distribution device, one end of an electromagnetic switch is connected to a power conversion device via the power distribution device, and the other end of the electromagnetic switch is connected to a charging gun. The power distribution device is used to distribute the input current into at least one output path.

[0043] The positive input stationary contact is connected to the positive output terminal of the power conversion device through the positive output terminal of the power distribution device, and the negative input stationary contact is connected to the negative output terminal of the power conversion device through the negative output terminal of the power distribution device.

[0044] This can be understood as follows: the positive output terminal of the power conversion device is connected to the positive input terminal of the power distribution device, and the positive output terminal of the power distribution device is connected to the positive input stationary contact. The negative output terminal of the power conversion device is connected to the negative input terminal of the power distribution device, and the negative output terminal of the power distribution device is connected to the negative input stationary contact.

[0045] In some embodiments, the charging device is a split-type charging pile, with the electromagnetic switch and charging gun located within the charging terminal, and the power conversion device and power distribution device located within the charging host. The power distribution device distributes the input current (the current output from the power conversion device to the power distribution device) to the electromagnetic switch. In the electromagnetic switch, the positive input stationary contact is electrically connected to the positive output terminal of the power conversion device via the connection to the positive output terminal of the power distribution device, and the negative input stationary contact is electrically connected to the negative output terminal of the power conversion device via the connection to the negative output terminal of the power distribution device. The positive output stationary contact is connected to the positive input terminal of the charging gun, and the negative output stationary contact is connected to the negative input terminal of the charging gun.

[0046] In this embodiment, the connection and disconnection between the positive output terminal of the power conversion device and the positive input terminal of the charging gun, as well as between the negative output terminal of the power conversion device and the negative input terminal of the charging gun, are controlled by an electromagnetic switch within the charging terminal. This reduces the number of parts in the charging terminal and simplifies the assembly process. Furthermore, the reduced number of parts in the charging terminal reduces potential points of failure and maintenance difficulty, lowers the probability of failure, simplifies maintenance, and thus improves mechanical lifespan. Attached Figure Description

[0047] Figure 1 This is a schematic diagram illustrating a usage scenario of a charging device provided in an embodiment of this application;

[0048] Figure 2 This is a partial structural diagram of a charging device provided in an embodiment of this application;

[0049] Figure 3 This is one of the schematic diagrams illustrating the use scenario of an electromagnetic switch provided in an embodiment of this application;

[0050] Figure 4 This is a second schematic diagram illustrating the application scenario of an electromagnetic switch provided in an embodiment of this application;

[0051] Figure 5 This is the third schematic diagram of an application scenario for an electromagnetic switch provided in this application.

[0052] Figure 6 This is one of the structural block diagrams of an electromagnetic switch provided in an embodiment of this application;

[0053] Figure 7 This is a second structural block diagram of an electromagnetic switch provided in an embodiment of this application;

[0054] Figure 8 This is a schematic diagram of the structure of an electromagnetic switch provided in an embodiment of this application;

[0055] Figure 9 A partial exploded view of an electromagnetic switch provided in an embodiment of this application;

[0056] Figure 10 One of the partial structural schematic diagrams of an electromagnetic switch provided in this application embodiment:

[0057] Figure 11 This is a second partial structural schematic diagram of an electromagnetic switch provided in an embodiment of this application;

[0058] Figure 12 The third partial structural schematic diagram of an electromagnetic switch provided in this application embodiment;

[0059] Figure 13 A partial cross-sectional view of an electromagnetic switch provided in an embodiment of this application;

[0060] Figure 14 for Figure 13 A magnified view of the area at position W in the middle.

[0061] Figure label:

[0062] 100-Charging equipment; 101-Charging host; 102-Charging terminal; 1021-Wind fan; 1022-Liquid cooling box; 200-Photovoltaic power generation system; 300-Energy storage module; 400-Power grid;

[0063] 10 - Charging gun; 20 - Power conversion device; 30 - Electromagnetic switch; 40 - First power distribution device; 50 - Second power distribution device;

[0064] 1-Cavity assembly;

[0065] 11-First housing; 12-Second housing; 121-First part; 122-Second part;

[0066] 2-First stationary contact; 21-Positive input stationary contact; 211-First contact a; 212-Second contact a; 22-Positive output stationary contact; 221-First contact b; 222-Second contact b; 23-Negative input stationary contact; 231-First contact c; 232-Second contact c; 24-Negative output stationary contact; 241-First contact d; 242-Second contact d;

[0067] 3-First moving contact; 31-Positive moving contact; 311-First contact e; 312-Second contact e; 32-Negative moving contact; 321-First contact f; 322-Second contact f;

[0068] 4-Second stationary contact; 41-Auxiliary input stationary contact; 411-First contact g; 412-Second contact g; 42-Auxiliary output stationary contact; 421-First contact h; 422-Second contact h;

[0069] 5-Second moving contact; 51-First contact i; 52-Second contact i;

[0070] 61-Protrusion; 62-Insulating adhesive layer; 63-Groove; 631-Groove a; 632-Groove b; 633-Groove c; 634-Groove d; 64-Insulating outer layer; 65-Conductive connector; 71-Electromagnetic mechanism; 72-Push rod; 73-Spring; 8-Circuit board; 81-Connecting terminal; 91-First board; 92-Second board;

[0071] 01-First hole; 011-First hole a; 012-First hole b; 013-First hole c; 014-First hole d; 02-Second hole; 021-Second hole a; 022-Second hole b; 023-Second hole c; 024-Second hole d; 03-First end face; 04-Second end face; 05-Third end face. Detailed Implementation

[0072] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0073] In this application, unless otherwise expressly specified and limited, the terms "upper", "lower", "front", "back", "left", "right", etc., indicating orientation or positional relationship may be defined relative to the orientation of the components schematically placed in the accompanying drawings. These directional terms may be relative concepts, used for relative description and clarification, and may change accordingly depending on the orientation of the components in the accompanying drawings. They should not be construed as limitations on this application.

[0074] In this application, the terms "first," "second," etc., are used for descriptive purposes only to distinguish one element from another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0075] In this application, unless otherwise expressly stated and limited, "multiple" means two or more.

[0076] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines or channels, the terms "connection" and "linkage" as used in this application have the meaning of establishing electrical conductivity. The specific meaning needs to be understood in conjunction with the context.

[0077] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0078] Figure 1 This is a schematic diagram illustrating a usage scenario of a charging device provided in an embodiment of this application. (Refer to...) Figure 1 The charging equipment is a split-type charging pile. The charging equipment 100 includes a charging host 101 and multiple charging terminals 102. The charging host 101 supplies power to the multiple charging terminals 102. Each charging terminal 102 is connected to a charging gun. Figure 1 (Not shown in the image) The charging gun is connected to the electric vehicle (EV) to charge the EV.

[0079] Reference Figure 1 The charging host 101 is equipped with a power conversion device 20. The input terminal of the power conversion device 20 is connected to a power source, and the output terminal of the power conversion device 20 is connected to the charging terminal 102. The power conversion device 20 is used to convert the input current into power and output it to multiple charging terminals.

[0080] In some embodiments, the charging host 101 is provided with a first power distribution device 40. The input terminal of the first power distribution device 40 is connected to a power source, and the output terminal of the first power distribution device 40 is connected to a power conversion device 20. The first power distribution device 40 is used to control the on / off state of the circuit between the power source and the power conversion device 20.

[0081] For example, in some embodiments, the first power distribution device 40 includes an AC switch, such as an AC relay or an AC contactor. The AC switch is connected to the circuit between the input terminal and the output terminal of the first power distribution device 40. The AC switch is used to control the on / off state of the circuit between the input terminal and the output terminal of the first power distribution device 40.

[0082] In some embodiments, the charging host 101 further includes a second power distribution device 50. The input terminal of the second power distribution device 50 is connected to the output terminal of the power conversion device 20, and the output terminal of the second power distribution device 50 is connected to a plurality of charging terminals 102. The second power distribution device 50 is used to control the on / off state of the circuit between the power conversion device 20 and the charging terminals 102.

[0083] For example, the second power distribution device 50 includes multiple DC switches, such as DC relays and DC contactors. The DC switches are connected in the circuit between the input terminal and the output terminal of the second power distribution device 50. The second power distribution device is used to distribute the input current (DC current output from the power conversion device to the second power distribution device) to the multiple DC switches, and controls the on / off state of the circuit through the multiple DC switches to realize the distribution of the output power of the power conversion device 20.

[0084] In some embodiments, the charging terminal 102 is further provided with a third power distribution device (not shown in the figure), the input end of the third power distribution device is connected to the second power distribution device 50, the output end of the third power distribution device is connected to the charging gun, and the third power distribution device is used to connect the circuit between the second power distribution device 50 and the charging gun.

[0085] The form of the power supply can be selectively designed according to actual needs. For example, in some embodiments, the power supply may include the power grid 400. In other embodiments, the power supply may include a photovoltaic-storage system, which includes a photovoltaic power generation system 200 and an energy storage module 300. The photovoltaic power generation system 200 converts solar energy into electrical energy, which is then transmitted to the charging host 101. The electrical energy stored in the energy storage module 300 is also transmitted to the charging host 101.

[0086] In embodiments where the power source includes a photovoltaic-storage system, the energy storage module 300 can provide auxiliary power to the charging host 101. This can be understood as follows: when the photovoltaic power generation system 200 is operating normally, the photovoltaic power generation system 200 supplies power to the charging host 101, and the energy storage module 300 does not supply power to the charging host 101. When the photovoltaic power generation system 200 malfunctions, the energy storage module 300 supplies power to the charging host 101.

[0087] In some embodiments, the energy storage module 300 can be connected to the photovoltaic power generation system 200. The photovoltaic power generation system 200 transmits electrical energy to the energy storage module 300, and the energy storage module 300 stores the electrical energy. When the energy storage module 300's power is depleted or partially consumed, the photovoltaic power generation system 200 can replenish the power.

[0088] In some embodiments, the power conversion device 20 may include an AC-DC conversion module, wherein the AC-DC conversion module is capable of converting the received alternating current (AC) into direct current (DC). In other embodiments, the power conversion device 20 includes an AC-DC conversion module and a DC-DC conversion module, which are connected via a DC bus. This application does not impose any special limitations on the specific form of the power conversion device 20, and those skilled in the art can selectively design it according to actual needs.

[0089] The above description uses a split-type charging pile as an example. In other embodiments of this application, the charging device can also be an integrated charging pile, with the power conversion device 20, the first power distribution device 40, the second power distribution device 50, the third power distribution device, and the charging gun housed in the same cabinet. In some embodiments, the integrated charging pile may not include the second power distribution device 50, and the output of the power conversion device 20 may be connected to the charging gun through the third power distribution device. This application does not impose specific limitations on the specific form of the charging device.

[0090] Figure 2 This is a partial structural schematic diagram of a charging device provided in an embodiment of this application. (Refer to...) Figure 2 The charging device 100 includes an electromagnetic switch 30, such as a contactor or relay. The electromagnetic switch 30 includes a positive input terminal (e.g., ...). Figure 2 As shown in A1), positive output terminal (as shown in Figure A1) Figure 2 As shown in A2), negative input terminal (as shown in Figure A2) Figure 2 (as shown in B1) and the negative output terminal (as shown in B1) Figure 2 (As shown in B2).

[0091] Taking the electromagnetic switch 30 as an example in the third power distribution device of the charging terminal 102, refer to Figure 2 The positive input terminal A1 is connected to the positive output terminal of the power conversion device 20 through the second power distribution device 50, and the positive output terminal A2 is connected to the positive input terminal of the charging gun 10. The negative input terminal B1 is connected to the negative output terminal of the power conversion device 20 through the second power distribution device 50, and the negative output terminal B2 is connected to the negative input terminal of the charging gun 10.

[0092] When the positive input terminal A1 and the positive output terminal A2 are connected, the circuit between the positive output terminal of the power conversion device 20 and the positive input terminal of the charging gun 10 is connected, thereby enabling the positive power circuit containing the power conversion device 20 and the charging gun 10 to be connected. When the positive input terminal A1 and the positive output terminal A2 are disconnected, the circuit between the positive output terminal of the power conversion device 20 and the positive input terminal of the charging gun 10 is disconnected, thereby enabling the positive power circuit containing the power conversion device 20 and the charging gun 10 to be disconnected.

[0093] When the negative input terminal B1 and the negative output terminal B2 are connected, the circuit between the negative output terminal of the power conversion device 20 and the negative input terminal of the charging gun 10 is connected, thereby enabling the negative power circuit containing the power conversion device 20 and the charging gun 10 to be connected. When the negative input terminal B1 and the negative output terminal B2 are disconnected, the circuit between the negative output terminal of the power conversion device 20 and the negative input terminal of the charging gun 10 is disconnected, thereby enabling the negative power circuit containing the power conversion device 20 and the charging gun 10 to be disconnected.

[0094] In the event of overload, open circuit or other faults during charging, the electromagnetic switch 30 can disconnect the electrical connection between the power conversion device 20 and the charging gun 10 to disconnect the positive power circuit and the negative power circuit, thus ensuring circuit safety.

[0095] Compared to a solution that uses separate electromagnetic switches 30 for the positive and negative power circuits, this application uses a single electromagnetic switch 30 to disconnect both circuits, resulting in fewer parts and a simplified assembly process. Furthermore, the reduced number of parts in the charging device 100 reduces potential points of failure and maintenance difficulty, lowering the probability of failure and simplifying maintenance, thereby increasing mechanical lifespan. Additionally, the reduced number of parts in the charging device 100 also helps to reduce its size, weight, and cost.

[0096] In some embodiments, the electromagnetic switch 30 can simultaneously disconnect the connection between the positive input terminal A1 and the positive output terminal A2, and the connection between the negative input terminal B1 and the negative output terminal B2, thereby simultaneously disconnecting the positive power circuit and the negative power circuit. The electromagnetic switch 30 can also simultaneously connect the connection between the positive input terminal A1 and the positive output terminal A2, and the connection between the negative input terminal B1 and the negative output terminal B2, thereby simultaneously connecting the positive power circuit and the negative power circuit.

[0097] Compared to a scheme where separate electromagnetic switches 30 are used for the positive power circuit and the negative power circuit, the embodiment provided in this application uses a single electromagnetic switch 30 to simultaneously disconnect and simultaneously connect the positive power circuit and the negative power circuit. This ensures that the opening and closing of the positive power circuit and the negative power circuit are synchronized, thereby improving the breaking limit and ensuring the safety of the charging circuit.

[0098] Besides its application in the third power distribution device of the charging terminal 102, the electromagnetic switch 30 can also be used in various other scenarios. For example, in some embodiments, the electromagnetic switch 30 is used in the first power distribution device 40. The positive input terminal of the electromagnetic switch 30 is connected to the positive terminal of the power supply, the positive output terminal of the electromagnetic switch 30 is connected to the positive input terminal of the power conversion device 20, the negative input terminal of the electromagnetic switch 30 is connected to the negative terminal of the power supply, and the negative output terminal of the electromagnetic switch 30 is connected to the negative input terminal of the power conversion device 20. The electromagnetic switch 30 can disconnect the electrical connection between the power conversion device 20 and the power supply, thereby disconnecting the positive and negative power circuits and ensuring circuit safety.

[0099] For example, in some embodiments, the electromagnetic switch 30 is used within the second power distribution device 50. The positive input terminal of the electromagnetic switch 30 is connected to the positive output terminal of the power conversion device 20, the positive output terminal of the electromagnetic switch 30 is connected to the positive input terminal of the charging terminal 102, the negative input terminal of the electromagnetic switch 30 is connected to the negative input terminal of the power conversion device 20, and the negative output terminal of the electromagnetic switch 30 is connected to the negative input terminal of the charging terminal 102. The electromagnetic switch 30 can disconnect the electrical connection between the power conversion device 20 and the charging terminal 102, thereby disconnecting the positive and negative power circuits and ensuring circuit safety. This application does not impose specific limitations in this regard.

[0100] Figure 3 This is a schematic diagram illustrating one application scenario of an electromagnetic switch provided in an embodiment of this application. (Refer to...) Figure 3 The electromagnetic switch 30 is used within the charging host 101. In some embodiments, the electromagnetic switch 30 may be applied to the first power distribution device 40 of the charging host 101. In other embodiments, the electromagnetic switch 30 may be applied to the second power distribution device 50 of the charging host 101 (e.g., Figure 1 As shown in the figure.

[0101] The electromagnetic switch 30 can be used in low-to-medium power charging scenarios, for example, Figure 4 This is a second schematic diagram illustrating an application scenario of an electromagnetic switch provided in an embodiment of this application. (Refer to...) Figure 4 The electromagnetic switch 30 is used in the air-cooled charging terminal 102. The air-cooled charging terminal 102 uses air-cooling technology for heat dissipation. It uses air as the heat transfer medium, utilizing natural air convection or forced air convection via a fan 1021 or other components to achieve heat dissipation for the charging terminal 102. Air-cooling has a simple structure and low cost, and is widely used in low-to-medium power charging scenarios.

[0102] The electromagnetic switch 30 can also be used in high-power fast charging scenarios. For example, Figure 5This is the third schematic diagram illustrating an application scenario of an electromagnetic switch provided in this application. (Refer to...) Figure 5 The electromagnetic switch 30 is used in the liquid-cooled charging terminal 102. The liquid-cooled charging terminal 102 uses liquid cooling technology for heat dissipation. The coolant inside the liquid cooling tank 1022 removes the heat generated during charging, thus maintaining the charging terminal 102 at a suitable operating temperature. The liquid-cooled charging terminal 102 has high heat dissipation efficiency and is suitable for high-power fast charging scenarios.

[0103] The above example illustrates the application of electromagnetic switch 30 in charging device 100. In other embodiments of this application, electromagnetic switch 30 can also be applied in other scenarios, such as charging and discharging circuits of electric vehicles, or high-voltage DC control scenarios such as inverters and power conversion systems (PCS). This application does not impose any special limitations on the specific application scenarios of electromagnetic switch 30.

[0104] Below, this application will provide an exemplary description using the electromagnetic switch 30 applied to the charging terminal 102 as an example.

[0105] Figure 6 This is one of the structural block diagrams of an electromagnetic switch provided in an embodiment of this application. Figure 7 This is a second structural block diagram of the electromagnetic switch 30 provided in an embodiment of this application. (Refer to...) Figure 6 and Figure 7 The electromagnetic switch 30 includes a first stationary contact 2 and a first moving contact 3. The electromagnetic switch 30 has a closed state and an open state. (Refer to...) Figure 6 When the electromagnetic switch 30 is in the closed state, the first moving contact 3 and the first stationary contact 2 are in contact. (Refer to...) Figure 7 When the electromagnetic switch 30 is in the open state, the first stationary contact 2 and the first moving contact 3 are separated.

[0106] In the embodiments provided in this application, the first stationary contact 2 includes a positive input stationary contact 21, a positive output stationary contact 22, a negative input stationary contact 23, and a negative output stationary contact 24. The first moving contact 3 includes a positive moving contact 31 and a negative moving contact 32.

[0107] The positive input stationary contact 21 passes through the second power distribution device 50 (e.g., Figure 2 (As shown) is connected to the positive output terminal of the power conversion device 20. The negative input stationary contact 23 is connected to the second power distribution device 50 (as shown). Figure 2 (As shown) is connected to the negative output terminal of the power conversion device 20. The positive output stationary contact 22 is used for electrical connection to the positive input terminal of the charging gun 10. The negative output stationary contact 24 is used for electrical connection to the negative input terminal of the charging gun 10.

[0108] Reference Figure 6 When the electromagnetic switch 30 is in the closed state, the positive moving contact 31 is in contact with the positive input stationary contact 21 and the positive output stationary contact 22, respectively, and the negative moving contact 32 is in contact with the negative input stationary contact 23 and the negative output stationary contact 24, respectively.

[0109] The positive moving contact 31 is in contact with both the positive input stationary contact 21 and the positive output stationary contact 22, enabling them to be electrically connected for conducting the positive power circuit (e.g., ...). Figure 6 (The circuit containing A1 and A2). The negative moving contact 32 is in contact with the negative input stationary contact 23 and the negative output stationary contact 24 respectively, enabling the negative input stationary contact 23 and the negative output stationary contact 24 to be electrically connected for conducting the negative power circuit (such as...). Figure 6 (The loop containing B1 and B2).

[0110] Reference Figure 7 When the electromagnetic switch 30 is in the open state, the positive moving contact 31 is separated from the positive input stationary contact 21 and the positive output stationary contact 22, respectively, and the negative moving contact 32 is separated from the negative input stationary contact 23 and the negative output stationary contact 24, respectively.

[0111] The positive moving contact 31 separates from both the positive input stationary contact 21 and the positive output stationary contact 22, thus disconnecting the electrical connection between them and breaking the positive power circuit. The negative moving contact 32 separates from both the negative input stationary contact 23 and the negative output stationary contact 24, thus disconnecting the negative power circuit.

[0112] Reference Figure 6 and Figure 7 The electromagnetic switch 30 also includes a circuit board 8, a second stationary contact 4, and a second moving contact 5. (See reference...) Figure 6 When electromagnetic switch 30 is in the closed state, the second moving contact 5 and the second stationary contact 4 are in contact. (Refer to...) Figure 7 When the electromagnetic switch 30 is in the open state, the second stationary contact 4 and the second moving contact 5 are separated.

[0113] In the embodiments provided in this application, the second stationary contact 4 includes an auxiliary input stationary contact 41 and an auxiliary output stationary contact 42. The auxiliary input stationary contact 41 is used to connect with the signal output terminal of the circuit board 8 (e.g., ...). Figure 6 (As shown in b) Electrical connection. The auxiliary output stationary contact 42 is used to connect to the signal input terminal of circuit board 8 (such as...). Figure 6 Electrical connection (as shown in a).

[0114] Reference Figure 6The second moving contact 5 contacts the auxiliary input stationary contact 41 and the auxiliary output stationary contact 42 respectively, enabling the auxiliary input stationary contact 41 and the auxiliary output stationary contact 42 to be electrically connected for conducting the auxiliary circuit (e.g., Figure 6 (The circuit indicated by the middle lead L). The auxiliary circuit is used to provide feedback on the status of the positive power circuit and the negative power circuit, reducing the error in the action coordination counting.

[0115] Circuit board 8 is used to control the switching of electromagnetic switch 30 between opening and closing, and to control the feedback of auxiliary contact signals. Compared with the scheme of setting one electromagnetic switch 30 for each positive power circuit and one electromagnetic switch for each negative power circuit (each electromagnetic switch has one circuit board 8), this application only sets one circuit board 8, which can reduce the number of cables, parts, and connection interfaces between circuit board 8 and the host computer, and reduce the risk of control connection failure. The structure, connection method, and working principle of the auxiliary circuit and circuit board 8 are well known to those skilled in the art, and will not be described in detail here.

[0116] In the embodiments provided in this application, reference is made to Figure 6 and Figure 7 The electromagnetic switch 30 also includes an electromagnetic mechanism 71, a push rod 72, and a spring 73. The push rod 72 is connected to both the positive moving contact 31 and the negative moving contact 32. The electromagnetic mechanism 71 converts electromagnetic energy into mechanical energy to generate an electromagnetic force that drives the push rod 72 along the X1 direction (e.g., ...). Figure 6 The electromagnetic switch 30 is switched to the closed state by moving the push rod 72 (as shown in the diagram). The spring 73 is used to push the push rod 72 to move along the X2 direction, thereby switching the electromagnetic switch 30 to the open state. The working principle, connection method, and structure of the electromagnetic mechanism 71, the push rod 72, and the spring 73 are well known to those skilled in the art, and will not be described in detail here.

[0117] After the coil of the electromagnetic mechanism 71 is energized, the resulting electromagnetic attraction causes the push rod 72 to move the positive moving contact 31, the negative moving contact 32, and the second moving contact 5 along the X1 direction to the following positions: the positive moving contact 31 contacts the positive input stationary contact 21 and the positive output stationary contact 22, the negative moving contact 32 contacts the negative input stationary contact 23 and the negative output stationary contact 24, and the second moving contact 5 contacts the auxiliary input stationary contact 41 and the auxiliary output stationary contact 42.

[0118] After the coil of the electromagnetic mechanism 71 is de-energized, under the action of electromagnetic attraction and the elasticity of the spring 73, the push rod 72 can drive the positive moving contact 31, the negative moving contact 32 and the second moving contact 5 to move along the X2 direction to the following: the positive moving contact 31 separates from the positive input stationary contact 21 and the positive output stationary contact 22 respectively; the negative moving contact 32 separates from the negative input stationary contact 23 and the negative output stationary contact 24 respectively; and the second moving contact 5 contacts the auxiliary input stationary contact 41 and the auxiliary output stationary contact 42 respectively.

[0119] Compared to a scheme where separate electromagnetic switches 30 are used for the positive and negative power circuits (with a time difference in their operation), the synchronous movement of the positive moving contact 31, negative moving contact 32, and second moving contact 5 via the push rod 72 ensures that the positive power circuit, negative power circuit, and auxiliary circuit operate synchronously, thereby improving the breaking limit. In high-voltage, high-current scenarios, the method of synchronously moving the positive moving contact 31, negative moving contact 32, and second moving contact 5 via the push rod 72 for current breaking can effectively improve breaking performance.

[0120] Reference Figure 6 and Figure 7 The positive input stationary contact 21 includes a first contact a211 and a second contact a212. The positive output stationary contact 22 includes a first contact b221 and a second contact b222. The negative input stationary contact 23 includes a first contact c231 and a second contact c232. The negative output stationary contact 24 includes a first contact d241 and a second contact d242. The positive moving contact 31 includes a first contact e311 and a second contact e312. The negative moving contact 32 includes a first contact f321 and a second contact f322. The auxiliary input stationary contact 41 includes a first contact g411 and a second contact g412. The auxiliary output stationary contact 42 includes a first contact h421 and a second contact h422. The second moving contact 5 includes a first contact i51 and a second contact i52.

[0121] The first contact a211 is used to connect to the positive output terminal of the power conversion device 20 (e.g., Figure 2 (As shown in the diagram) Electrical connection. The first contact c231 is used to connect to the negative output terminal of the power conversion device 20 (as shown in the diagram). Figure 2 (As shown in the diagram) Electrical connection. The second contact b222 is used to connect to the positive input terminal of the charging gun 10 (as shown in the diagram). Figure 2 (As shown in the diagram) Electrical connection. The second contact d242 is used to connect to the negative input terminal of the charging gun 10 (as shown in the diagram). Figure 2 (As shown in the diagram) Electrical connections. The first contact g411 is used for electrical connection to the signal output terminal of circuit board 8. The second contact h422 is used for electrical connection to the signal input terminal of circuit board 8.

[0122] Reference Figure 6When the electromagnetic switch 30 is in the closed state, the first contact e311 is in contact with the second contact a212, and the second contact e312 is in contact with the first contact b221. The first contact f321 is in contact with the second contact c232, the second contact f322 is in contact with the first contact d241, the first contact i51 is in contact with the second contact g412, and the second contact i52 is in contact with the first contact h421.

[0123] Reference Figure 7 When the electromagnetic switch 30 is in the open state, the first contact e311 is separated from the second contact a212, and the second contact e312 is separated from the first contact b221. The first contact f321 is separated from the second contact c232, the second contact f322 is separated from the first contact d241, the first contact i51 is separated from the second contact g412, and the second contact i52 is separated from the first contact h421.

[0124] Figure 8 This is a schematic diagram of an electromagnetic switch provided in an embodiment of this application. (Refer to...) Figure 8 The electromagnetic switch 30 includes a second housing 12, which is an insulating housing, such as a polystyrene (PS) housing or a phenolic resin housing.

[0125] Reference Figure 8 The second housing 12 has a second hole 02. There are multiple second holes 02, such as second hole a021, second hole b022, second hole c023, and second hole d024. First contact a211 extends outside the second housing 12 through second hole a021. Second contact b222 extends outside the second housing 12 through second hole b022. First contact c231 extends outside the second housing 12 through second hole c023. Second contact d242 extends outside the second housing 12 through second hole d024.

[0126] Reference Figure 8 The second housing 12 includes a second end face 04, on which a first plate 91 and a second plate 92 are disposed. Both the first plate 91 and the second plate 92 are insulating plates, such as polystyrene (PS) plates, polyvinyl chloride (PVC) plates, or fiberglass reinforced plastic (FRP) plates. The first plate 91 and the second plate 92 protrude from the second end face 04 and are arranged in a cross shape to divide the second end face 04 into four regions: region A1, region A2, region B1, and region B2. A second hole a021 and a first contact a211 are located in region A1. A second hole b022 and a second contact b222 are located in region A2. A second hole c023 and a first contact c231 are located in region B1. A second hole d024 and a second contact d242 are located in region B2.

[0127] The first plate 91 and the second plate 92 can separate the first contact a211, the second contact b222, the first contact c231 and the second contact d242, preventing short circuits between each pair of the first contact a211, the second contact b222, the first contact c231 and the second contact d242, reducing the insulation risk of the electromagnetic switch 30 and improving the safety performance of the electromagnetic switch 30.

[0128] Figure 9 This is a partial exploded view of an electromagnetic switch provided in an embodiment of this application. (Refer to...) Figure 9 The electromagnetic switch 30 includes a cavity assembly 1 (such as...) Figure 9 The cavity assembly 1 (enclosed by the dashed box) is housed within the second housing 12. The cavity assembly 1 includes a first housing 11, which is an insulating housing, such as a ceramic housing.

[0129] In some embodiments, such as when the electromagnetic switch 30 is a contactor, the first housing 11 is filled with high-pressure hydrogen or a nitrogen-hydrogen mixture. High-pressure hydrogen and nitrogen-hydrogen mixtures have good arc-extinguishing properties, which helps to extinguish the arc quickly, significantly increasing the speed at which the electromagnetic switch 30 breaks the circuit, thereby improving its breaking performance. This helps reduce transient overvoltages and overcurrents in the circuit, protecting other components from damage. Simultaneously, rapid breaking also helps improve the stability and reliability of the power system.

[0130] Alternatively, the inner cavity of the first housing 11 can be a vacuum chamber. The extremely low number of gas molecules in a vacuum chamber helps prevent current leakage and short circuits, ensuring the electrical stability of the electromagnetic switch 30. Furthermore, maintaining an electric arc becomes difficult in a vacuum environment due to the lack of gas molecules to support its combustion. Setting the inner cavity of the first housing 11 as a vacuum chamber allows for the rapid and effective extinguishing of the arc, protecting the contact points from arc erosion.

[0131] Reference Figure 9 The second housing 12 includes a first portion 121 and a second portion 122, which are connected. During installation, the cavity assembly 1 can be first housed within the first portion 121, and then the first portion 121 and the second portion 122 can be connected to form the second housing 12. After installation, the second housing 12 surrounds the outer peripheral surface of the first housing 11.

[0132] There are various ways to connect the first part 121 and the second part 122. For example, in some embodiments, the first part 121 and the second part 122 are connected by a snap-fit. In other embodiments, the first part 121 and the second part 122 are connected by a fastener. This application does not impose specific limitations on the specific connection method of the first part 121 and the second part 122.

[0133] In the embodiments provided in this application, reference is made to Figure 9 The circuit board 8 and the electromagnetic mechanism 71 are also housed in the second housing 12, so that the structure of the electromagnetic switch 30 is arranged more compactly, reducing the size and space occupied by the electromagnetic switch 30.

[0134] Figure 10 This is one of the partial structural schematic diagrams of an electromagnetic switch provided in an embodiment of this application. Figure 11 This is one of the partial structural schematic diagrams of an electromagnetic switch provided in an embodiment of this application. (Refer to...) Figure 10 and Figure 11 The first housing 11 includes a first end face 03, and the first end face 03 is provided with a first hole 01. The first hole 01 includes multiple holes, such as first hole a011, first hole b012, first hole c013, and first hole d014. A first contact a211 extends outside the first housing 11 through the first hole a011. A second contact b222 extends outside the first housing 11 through the first hole b012. A first contact c231 extends outside the first housing 11 through the first hole c013. A second contact d242 extends outside the first housing 11 through the first hole d014.

[0135] The first end face 03 is also provided with a groove 63. The groove 63 is recessed into the first end face 03 and is arranged around the first hole 01. (Refer to...) Figure 11 The groove 63 includes multiple grooves, such as groove a631, groove b632, groove c633, and groove d634. Groove a631 is arranged around the first hole a011. Groove b632 is arranged around the first hole b012. Groove c633 is arranged around the first hole c013. Groove d634 is arranged around the first hole d014.

[0136] Reference Figure 11 The outer periphery of the first housing 11 is provided with a permanent magnet (such as... Figure 11 Conductive devices such as the N-pole magnet and S-pole magnet shown in the figure. To ensure insulation, an insulating structure, such as an insulating adhesive layer, needs to be provided on the outer periphery of the first stationary contact. The groove 63 ensures that the insulating adhesive can be uniformly and accurately placed on the outer periphery of the first stationary contact. During the injection process, the insulating adhesive flows uniformly along the groove 63, so that the insulating adhesive layer formed after curing is more uniform. Compared with the method of coating the insulating adhesive inside the first hole 01 to form an insulating adhesive layer, the method of injecting the insulating adhesive into the groove 63 to form an insulating adhesive layer in this application has a more uniform distribution of the insulating adhesive layer, better insulation performance, and reduces the insulation risk of the electromagnetic switch 30. In addition, it can also prevent the insulating adhesive layer from being damaged during the installation of the first stationary contact, reduce the occurrence of edge leakage of the first stationary contact 2, and reduce the insulation risk.

[0137] The groove 63 is arranged around the first hole 01. After the insulating adhesive is injected into the groove 63, an annular insulating adhesive layer 62 is formed around the first stationary contact 2. The annular insulating adhesive layer 62 forms a continuous barrier around the outer periphery of the first stationary contact 2, which enhances the insulation performance between the first stationary contact 2 and other conductive devices, and prevents electrical faults such as arc discharge and short circuit.

[0138] Reference Figure 11 The auxiliary input stationary contact 41 and the auxiliary output stationary contact 42 are respectively connected to the circuit board 8 via conductive connectors 65 (such as copper busbars or cables). To prevent short circuits between the conductive connectors 65 and other conductive devices, an insulating outer layer 64 is wrapped around the outer periphery of the conductive connectors 65 to further improve the insulation performance of the electromagnetic switch 30.

[0139] In some embodiments, the auxiliary input stationary contact 41 and the auxiliary output stationary contact 42 are disposed on the first end face 03. For example, they are disposed between the first contact a211, the second contact b222, the first contact c231, and the second contact d242. This makes the structural arrangement of the first end face 03 more compact, which helps to reduce the size and space occupied by the electromagnetic switch 30.

[0140] Reference Figure 11 The circuit board 8 includes a connection terminal 81 for connecting to a host computer. The host computer is a computer that can directly issue control commands. Under the instructions of the host computer, the circuit board 8 controls the opening and closing operations of the electromagnetic switch 30, and simultaneously receives auxiliary contact signal status.

[0141] Figure 12 This is the third partial structural schematic diagram of the electromagnetic switch provided in the embodiments of this application. (Refer to...) Figure 12 The second housing 12 includes a protrusion 61, which protrudes from the inner wall surface of the second housing 12 (e.g., Figure 12 The surface indicated by the center lead 05 (hereinafter referred to as the third end face 05). The protrusion 61 is set around the second hole 02.

[0142] This can be understood as follows: the protrusion 61 is an annular protrusion, and the annular protrusion is arranged around the outer peripheral surface of the first stationary contact 2. The annular protrusion can play an insulating and protective role on the outer periphery of the first stationary contact 2, increase the creepage distance, and enhance the insulation performance between multiple first stationary contacts or between the first stationary contact and other conductive devices, so as to reduce the occurrence of electrical faults such as arc discharge and short circuit, thereby improving the insulation performance of the electromagnetic switch.

[0143] In this embodiment, protrusion 61 includes multiple protrusions, such as protrusion a, protrusion b, protrusion c, and protrusion d. Protrusion a is arranged around the second hole a021 to provide insulation protection for the positive input stationary contact 21. Protrusion b is arranged around the second hole b022 to provide insulation protection for the positive output stationary contact 22. Protrusion c is arranged around the second hole c023 to provide insulation protection for the negative input stationary contact 23. Protrusion d is arranged around the second hole d024 to provide insulation protection for the negative output stationary contact 24.

[0144] Figure 13 This is the fourth partial structural schematic diagram of the electromagnetic switch provided in the embodiments of this application. (Refer to...) Figure 13 One end of the positive input stationary contact 21 extends out of the second housing 12 through the first hole a011 and the second hole a021, and one end of the positive output stationary contact 22 extends out of the second housing 12 through the first hole b012 and the second hole b022. The other ends of the positive input stationary contact 21, the other ends of the positive output stationary contact 22, and the positive moving contact 31 are located inside the first housing 11.

[0145] Since the first housing 11 is an insulating housing, the positive moving contact 31, the portion of the positive input stationary contact 21 located inside the first housing 11, and the portion of the positive output stationary contact 22 located inside the first housing 11 are insulated from other conductive devices located outside the first housing 11.

[0146] Reference Figure 13 An insulating adhesive layer 62 is placed in the gap between the protrusion 61, the positive input stationary contact 21, and the first end face 03. From the radial direction outward from the positive input stationary contact 21, there are sequentially the insulating adhesive layer 62 (first-level insulation protection) and the protrusion 61 (second-level insulation protection). Therefore, by providing the insulating adhesive layer 62, on the one hand, it can provide insulation protection for the positive input stationary contact 21, thereby enhancing its insulation performance. On the other hand, the insulating adhesive layer 62 is formed by the curing of insulating adhesive. The cured insulating adhesive layer 62 can fill the gap between the protrusion 61 and the first end face 03, further increasing the insulation protection effect and reducing the risk of insulation failure.

[0147] The insulating adhesive layer 62 can be made of any suitable material, such as silicone rubber, epoxy resin or polyvinyl chloride (PVC). This application does not impose specific restrictions on the material of the insulating adhesive layer 62, and those skilled in the art can choose according to actual needs.

[0148] Reference Figure 13An insulating adhesive layer 62 is also accommodated in the gap between the protrusion 61, the positive output stationary contact 22, and the first end face 03. The principle is the same as that for the insulating adhesive layer 62 on the outer periphery of the positive input stationary contact 21. Furthermore, the principles for the negative input stationary contact 23 and the negative output stationary contact 24 are the same as those for the positive input stationary contact 21 and the positive output stationary contact 22, and will not be repeated here.

[0149] Figure 14 for Figure 13 A magnified view of the W-shaped area. (Refer to...) Figure 14 Taking the positive input stationary contact 21 as an example, the end of the protrusion 61 near the first housing 11 abuts against the first end face 03.

[0150] This reduces the gap between the protrusion 61 and the first end face 03, thereby reducing the risk of short circuits (current concentrates and stores electrical energy in the gap, leading to a short circuit) between the positive input stationary contact 21 and other conductive devices, and improving the insulation performance of the electromagnetic switch 30.

[0151] In some embodiments, the protrusion 61 abuts against the first end face 03 near the surface of the first housing 11, reducing the gap between the protrusion 61 and the first end face 03 through surface contact, thereby further reducing the risk of short circuit between the positive input stationary contact 21 and other conductive devices.

[0152] exist Figure 14 In the illustrated embodiment, the end of the protrusion 61 near the first housing 11 extends into the groove 63. Since a large gap exists between the protrusion 61 and the first end face 03 after the first housing 11 and the second housing 12 are assembled, this reduces the insulating protection effect and causes the insulating adhesive to flow into the interior of the first housing 11 and the second housing 12 along the gap between the protrusion 61 and the first end face 03 during the injection process, resulting in losses.

[0153] By having one end of the protrusion 61 near the first housing 11 extend into the groove 63, the gap between the protrusion 61 and the first end face 03 can be reduced after the first housing 11 and the second housing 12 are assembled, thus reducing the loss of insulating adhesive while ensuring insulation protection. On the other hand, the protrusion 61 extending into the groove 63 can also serve as a limiting force for installation, ensuring that the protrusion 61 is installed in place. The structure is simple and the operation is convenient.

[0154] In some embodiments, the inner diameter of the second hole 02 facing the first end face 03 is larger than the inner diameter of the first hole 01. (Refer to...) Figure 14 The inner diameter of the second hole 02 facing the first end face 03 is d1, and the inner diameter of the first hole 01 is d, where d1 > d.

[0155] This allows for a certain distance between the inner wall of the second hole 02 and the outer peripheral surface of the positive input stationary contact 21, resulting in an appropriate size for the insulating adhesive layer 62 in the radial direction of the positive input stationary contact 21. This provides sufficient electrical insulation protection while reducing the cost of the insulating adhesive layer 62. This size can be selectively designed based on factors such as the voltage level of the positive input stationary contact 21; the embodiments of this application do not impose special limitations on the specific size of the insulating adhesive layer 62.

[0156] In some embodiments, the inner diameter of the second hole 02 facing the first end face 03 is smaller than the inner diameter of the second hole 02 away from the first end face 03. (Refer to...) Figure 14 The inner diameter of the second hole 02 facing the first end face 03 is d1, and the inner diameter of the second hole 02 away from the first end face 03 is d2, where d1 is less than d2.

[0157] This design allows for the inclusion of more insulating adhesive, improving insulation performance. It also ensures more stable injection flow and speed, thereby enhancing the uniformity and consistency of the insulating adhesive layer 62 and reducing the risk of insulation failure. Furthermore, it provides sufficient space for the dispensing device, facilitating automated dispensing.

[0158] The above embodiment is exemplified using the positive input stationary contact 21 as an example. The insulation protection settings of the negative input stationary contact 23, the negative output stationary contact 24, and the positive output stationary contact 22 are the same as those of the positive input stationary contact 21. These will not be repeated here.

[0159] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electromagnetic switch, characterized in that, The electromagnetic switch includes: A first housing, the first housing including a first end face, the first end face including a first hole; A second housing is disposed around the outer peripheral surface of the first housing, and the surface of the second housing facing the first end face includes a second hole; A first stationary contact and a first moving contact, one end of the first stationary contact extends out of the second housing through the first hole and the second hole, and the other end of the first stationary contact and the first moving contact are located inside the first housing, and the first moving contact is used to contact or disconnect with the first stationary contact; Both the first housing and the second housing are insulating housings. The second housing includes a protrusion arranged around the second hole, which protrudes from the inner wall surface of the second housing.

2. The electromagnetic switch according to claim 1, characterized in that, The protrusion abuts against the first end face near the first housing.

3. The electromagnetic switch according to claim 1 or 2, characterized in that, The electromagnetic switch further includes an insulating adhesive layer, which is housed in the gap between the first end face, the protrusion, and the first stationary contact.

4. The electromagnetic switch according to claim 1 or 2, characterized in that, The first end face includes a groove, which is recessed into the first end face, and the end of the protrusion near the first housing extends into the groove.

5. The electromagnetic switch according to claim 3, characterized in that, The first end face includes a groove, which is recessed into the first end face, and the end of the protrusion near the first housing extends into the groove.

6. The electromagnetic switch according to claim 4, characterized in that, The groove is arranged around the first hole.

7. The electromagnetic switch according to claim 1 or 2, characterized in that, The inner diameter of the second hole facing the first end face is larger than the inner diameter of the first hole.

8. The electromagnetic switch according to claim 1 or 2, characterized in that, The inner diameter of the second hole facing the first end face is smaller than the inner diameter of the second hole facing away from the first end face.

9. A charging device, characterized in that, The charging device includes a power conversion device and an electromagnetic switch according to any one of claims 1-8, wherein the electromagnetic switch is connected to the input or output terminal of the power conversion device.

10. The charging device according to claim 9, characterized in that, The charging device includes a charging gun; The first stationary contact includes multiple first stationary contacts, each of which includes a positive input stationary contact, a positive output stationary contact, a negative input stationary contact, and a negative output stationary contact. The positive input stationary contact is connected to the positive output terminal of the power conversion device, and the positive output stationary contact is connected to the positive input terminal of the charging gun. The negative input stationary contact is connected to the negative output terminal of the power conversion device, and the negative output stationary contact is connected to the negative input terminal of the charging gun.

11. The charging device according to claim 10, characterized in that, The charging device includes a power distribution device. One end of the electromagnetic switch is connected to the power conversion device through the power distribution device, and the other end of the electromagnetic switch is connected to the charging gun. The power distribution device is used to distribute the input power into at least one channel and output it. The positive input stationary contact is connected to the positive output terminal of the power conversion device through the positive output terminal of the power distribution device, and the negative input stationary contact is connected to the negative output terminal of the power conversion device through the negative output terminal of the power distribution device.

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