Electromagnetic locking device for a charging port cover of a new energy vehicle

Abstract

The present invention relates to an electromagnetic locking device for a charging port cover of a new-energy vehicle, comprising a charging port box and a charging port cover rotatable about a pivot line, wherein a permanent magnet assembly is attached to the front end of the charging port cover, and the charging port box is equipped with an electromagnetic assembly. Without power being supplied, the permanent magnet assembly and the electromagnetic assembly attract each other, thus keeping the charging port cover closed. When power is supplied, the electromagnetic assembly generates a magnetic field that repels the permanent magnet assembly, thereby opening the charging port cover. The charging port box is further provided with a protective cover, wherein the protective cover has a filling channel on its rear side.The electromagnetic assembly is connected to a receiving recess via a terminal block. An overcurrent protection component for heat dissipation is mounted in the receiving recess. The trough is equipped with a wiring harness connected to an external power source and in series with the overcurrent protection component, the terminal block, and the electromagnetic assembly. The heat generated when the electromagnetic assembly is powered increases the resistance of the overcurrent protection component, thereby reducing the current and minimizing heat generation. The trough is filled with liquid epoxy resin, which, after curing, seals the electromagnetic assembly and its electrical connections.

Description

Technical field

[0001] The embodiments of the present application relate to the technical field of automotive accessories, in particular an electromagnetic locking device for a charging port cover of a new energy vehicle. State of the art

[0002] Currently, vehicles such as commercial vehicles and passenger cars predominantly use an internal locking mechanism, and the driver's seat is equipped with a pull or switch to open the fuel filler cap. This design is characterized by a complex structure and high costs, making it unsuitable for new energy vehicles, especially low-speed models, where customers forgo anti-theft protection and prioritize low costs.

[0003] Currently, most new energy vehicles on the market, including low-speed electric vehicles and small off-road vehicles such as sightseeing vehicles and patrol vehicles, use a manual opening method for their charging port cover.

[0004] Patent number CN212529337 discloses a magnetic charging port cover component for a new energy vehicle. The component consists of a first mounting seat, a first magnetic disc, a second mounting seat, and a second magnetic disc. The first and second magnetic discs attract each other, allowing the charging port cover to be closed over the charging port box. When the charging port cover needs to be opened, a pull rod, a connecting plate, a torsion spring, a pull ring, and an L-shaped sliding rod are used. The pull ring is pulled manually to move the pull rod. The pull rod then moves the second mounting seat, disengaging the second magnetic disc from the first. The torsion spring then automatically opens the charging port cover.Although this invention addresses the shortcomings of patent number CN209208514U, where the charging port cover had to be opened manually, the pull ring still needs to be pulled to move the pull rod to open the charging port cover. This remains inconvenient. Furthermore, the torsion spring lacks appropriate protective measures or structures during use, which compromises its reliability. There is a need for an electromagnetic locking device characterized by a simple design, convenient installation, improved automation through electronic control, and high safety and reliability. Content of the invention

[0005] The present invention addresses the following problem by providing an electromagnetic locking device for a charging port cover of a new energy vehicle: existing magnetic charging port covers have insufficient automation, require manual intervention during use, and lack appropriate protective measures. This results in less convenient use and low reliability.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problems comprises: an electromagnetic locking device for a charging port cover of a new energy vehicle, comprising a charging port box and a charging port cover that is connected to the charging port box along a pivot line and is pivotable about the pivot line between a closed position and an open position; wherein the charging port cover is arranged at the front end of the charging port box, an electromagnetic assembly is provided on the charging port box, and a permanent magnet assembly is provided on the charging port cover, wherein in the closed position the permanent magnet assembly is arranged opposite the charging port cover: Without a power supply to the electromagnetic assembly, the permanent magnet assembly generates an attractive magnetic field with the electromagnetic assembly, which holds the charging port cover in the closed position; When current is supplied to the electromagnetic assembly, the electromagnetic assembly generates a magnetic field that repels the permanent magnet assembly, with a repulsive magnetic force causing the charging port cover to rotate towards the open position; The charging port box further comprises a protective cover, wherein the protective cover is arranged at the rear end of the electromagnetic assembly, the protective cover is provided with a filling channel, the electromagnetic assembly is provided with a terminal connection connected to the filling channel and a receiving recess, wherein an overcurrent protection component is arranged in the receiving recess, forming a heat conductor with the electromagnetic assembly, and a wiring harness connected to an external power source is attached in the filling channel, wherein the wiring harness is connected in series with the overcurrent protection component, the terminal connection and the electromagnetic assembly; wherein the heat generated after the current supply to the electromagnetic assembly increases the resistance of the overcurrent protection component, heat generated by the electromagnetic assembly is dissipated to the overcurrent protection component, the resistance of the overcurrent protection component is increased, thereby reducing the current flowing through the overcurrent protection component and thus reducing the heat generated by the electromagnetic assembly; and wherein a liquefied epoxy resin is poured into the filling channel, the overcurrent protection component, the terminal connection and the electrical connections between the wiring harness and the overcurrent protection component or the terminal connection are immersed, and after curing a protective section is formed in the filling channel which seals the electromagnetic assembly.

[0007] In comparison to the prior art, the advantageous effects of the present invention are as follows: The charging port box and the associated charging port cover, the charging port cover being freely pivotable about the pivot line between the closed and open positions. The charging port cover is located at the front end of the charging port box, while the electromagnetic assembly and the permanent magnet assembly are mounted on the charging port box. When the charging port cover is closed, the permanent magnet assembly faces the electromagnetic assembly to form the attractive magnetic field, ensuring that the charging port cover remains securely closed. When current is supplied to the electromagnetic assembly, the magnetic field it generates repels the permanent magnet assembly, thereby driving the charging port cover to open automatically. This significantly increases the level of automation of the device.

[0008] Furthermore, the charging port box is equipped with a protective cover, which features a recess for the wiring harness connected to an external power source. The electromagnetic assembly has a terminal connection linked to the recess and a mounting hole. An overcurrent protection component is mounted in this recess to ensure efficient heat dissipation. When the electromagnetic assembly is powered, the generated heat is transferred to the overcurrent protection component, increasing its resistance and reducing the current. This, in turn, lowers the heat generated by the electromagnetic assembly, effectively preventing overheating and potential malfunctions. Simultaneously, the critical components of the electromagnetic assembly are fully protected by injecting liquid epoxy resin into the recess and allowing it to cure.sealed. This significantly improves water and dust resistance, thus extending the device's service life. This electromagnetic locking device, through integrated automatic control and effective thermal management design, ensures efficient and reliable operation of the charging port cover, thus providing robust protection for the safety and convenience of charging new energy vehicles. Preferably, the electromagnetic assembly, with regard to its specific design, comprises an electromagnetic housing, a coil holder, and an iron core, each mounted within the electromagnetic housing. The terminal connection includes an input terminal and an output terminal, which are attached to the coil holder. The receiving recess is located on the coil holder and simultaneously penetrates the inner and outer walls of the coil holder.The iron core is connected to the inner wall of the coil holder in a plug-in connection, with a coil wound around the outer wall of the coil holder. The coil enters via the input terminal and exits via the output terminal. During winding, the coil rests against the sensor end of the overcurrent protection component, creating a heat conduction path. This presses the overcurrent protection component against the outer wall of the iron core connected to the coil holder. During the winding process, the coil comes into contact with the sensor end of the overcurrent protection component, establishing a heat conduction path. The overcurrent protection component is pressed firmly against the outer wall of the iron core, ensuring good heat conduction and efficient thermal management, and preventing overheating.

[0009] Preferably, the electromagnetic housing comprises a hollow electromagnetic housing body and an electromagnetic housing cover, wherein the electromagnetic housing body and the electromagnetic housing cover are joined and mounted relative to each other in a single assembly direction, the outer wall of the mating end of the electromagnetic housing body forming a press-fit connection with the inner wall of the mating end of the electromagnetic housing cover, and a sealing arrangement being provided between the sections in the mating connection. The electromagnetic housing body and the electromagnetic housing cover are firmly connected to each other by the press-fit connection, thereby effectively protecting them from external environmental influences such as dust and moisture and thus improving the reliability and durability of the electromagnetic assembly.

[0010] Preferably, the sealing arrangement comprises an extruded groove arranged circumferentially on the outer wall of the mating end of the electromagnetic housing body, wherein an O-ring seal is fitted within the extruded groove, and wherein, during the joining and assembly of the electromagnetic housing body and the electromagnetic housing cover, the inner wall of the mating end of the electromagnetic housing cover bears against the O-ring seal, pressing the O-ring seal against the bottom surface of the extruded groove. This sealing arrangement provides a reliable sealing function and improves the durability and stability of the electromagnetic assembly in various operating environments.Preferably, the electromagnetic housing body is provided with a limiting section, the coil holder is mounted in the electromagnetic housing body and has a winding section on its outer wall for winding a currentable coil, wherein the two axial sides of the winding section are provided with a first annular disk and a second annular disk respectively, the radial outer edges of which each bear against the inner wall of the electromagnetic housing body, wherein during the joining and assembly of the electromagnetic housing cover and the electromagnetic housing body, the electromagnetic housing cover bears against the second annular disk, whereby the coil holder as a whole is moved in the direction of the limiting section until the end face of the first annular disk presses against the limiting section.This structural configuration allows for quick assembly via the plug-in connection with precise positioning, thereby reducing the complexity of the assembly.

[0011] Preferably, the input terminal and the output terminal are each arranged on two projecting protrusions on the second ring disk along the assembly direction. During assembly and mounting of the electromagnetic housing cover and the electromagnetic housing body, the outer walls of the two projecting protrusions are inserted into two locating holes on the electromagnetic housing cover. Each projecting protrusion has a mounting groove, and the protective cover is provided with two positioning protrusions, which are inserted into the two mounting grooves. The above-mentioned structure not only simplifies the assembly process but also increases the reliability and stability of the electromagnetic assembly.Precise positioning of the individual components is ensured by the plug-in connection of the protruding tabs with the locating holes and the fitting of the positioning tabs in the mounting grooves. This prevents problems caused by improper assembly, such as loose connections or structural instability.

[0012] Preferably, the permanent magnet assembly comprises a magnet mounting base mounted on the charging port cover, and an attracting end face is arranged at the front end of the electromagnetic housing body. In the closed position of the permanent magnet assembly, the attracting end face corresponds to the end face of the magnet mounting base. A mounting groove is arranged on the end face of the magnet mounting base, and a magnet is arranged in the mounting groove. A working air gap is formed between the magnet and the attracting end face, and an attracting magnetic field is generated with the attracting end face. The arrangement of the working air gap prevents potential problems that arise from direct contact between the magnet and other components.

[0013] Preferably, the working air gap is 0.1 to 0.8 mm.

[0014] Preferably, the attractive magnetic force generated between the magnetic steel and the attracting end face is ≤ 200 N to prevent excessive magnetic force during attraction, which could cause the magnetic steel to break upon contact. Brief description of the drawings Fig. Figure 1 is a sectional view of the present invention as a whole; Fig. Figure 2 is a three-dimensional view of an electromagnetic assembly and a permanent magnet assembly of the present invention; Fig. Figure 3 is a three-dimensional view of the electromagnetic assembly and the permanent magnet assembly of the present invention; Fig. 4 is a sectional view of the electromagnetic assembly and the permanent magnet assembly of the present invention; Fig. Figure 5 is a three-dimensional view of the present invention, wherein the electromagnetic housing and the permanent magnet assembly are hidden; Fig. Figure 6 is a three-dimensional view of the present invention, wherein a coil holder partially conceals a coil wound around an outer wall; Fig. 7 is a sectional view of the electromagnetic assembly and the permanent magnet assembly of the present invention; Reference symbol list: 1 charging port box; 2 Electromagnetic assembly; 2.1 Electromagnetic housing; 2.1.1. Electromagnetic housing body; 2.1.2. Extruded groove; 2.1.3 O-ring seal; 2.1.4. Boundary section; 2.1.5. Electromagnetic housing cover; 2.1.6. Passhole; 2.1.7. Attracting frontal surface; 2.2. Spool holder; 2.2.1. Admission exemption; 2.2.2. Winding section; 2.2.3. First ring disc; 2.2.4. Second ring disc; 2.2.5. Protruding projection; 2.2.6. Mounting groove; 2.3. Iron core; 3 Protective cover; 3.1. Filling trough; 3.2 Positioning advantage; 4 Overcurrent protection component; 5 wiring harness; 6 terminal connections; 6.1. Input terminal connection; 6.2. Output terminal connection; 7 Charging port cover; 8 Permanent magnet assembly; 8.1. Magnetic mounting base; 8.1.1. Mounting groove; 8.2. Magnet steel; 8.3. Working air gap. Detailed description of embodiments

[0015] Before describing an embodiment of the present invention in more detail, it should be understood that the application of the present invention is not limited to the design and arrangement details of the components described below or illustrated in the accompanying drawings. The present invention may have other embodiments and be implemented or carried out in various ways.

[0016] Furthermore, it should be noted that the formulations and terms used here serve solely for descriptive purposes and should not be interpreted as restrictive. The use of "include" or "include" and their variants in this document is intended to cover the points listed below, their equivalents, and additional points. Unless otherwise specified or limited, the terms "assembly," "connection," "support," and "coupling," as well as their variants, are used broadly and encompass both direct and indirect assembly, connection, support, and coupling. Moreover, "connection" and "coupling" are not limited to physical or mechanical connections or couplings.

[0017] Furthermore, in the disclosure of the present invention, the terms “longitudinal”, “transverse”, “top”, “bottom”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, and similar indications of direction or positional relationship are based on the orientation or positional relationship illustrated in the accompanying drawings. They serve solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or elements mentioned must have a particular orientation, be constructed in a particular orientation, or be operated in a particular orientation. Therefore, the aforementioned terms are not to be interpreted as limitations of the present invention. Secondly, the term “one” should be understood as “at least one” or “one or more”.This means that in one embodiment the set of an element can be one, while in another embodiment the set of this element can be multiple. The term "one" is not to be interpreted as a quantity restriction.

[0018] It is clear to a person skilled in the art that the embodiments of the present invention described above and illustrated in the accompanying drawings serve only as examples and do not limit the present invention. The object of the present invention has already been fully and effectively achieved. The functions and structural principles of the present invention are demonstrated and explained in the exemplary embodiments. Without deviating from the described principles, the embodiments of the present invention can be varied or modified in any way.

[0019] The exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0020] In the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig.Figure 7 shows an electromagnetic locking device for a charging port cover of a new energy vehicle, comprising a charging port box 1 and a charging port cover 7, which is pivotable about a pivot line between a closed position and an open position. An electromagnetic assembly 2 and a protective cover 3 are mounted on the charging port box 1, the protective cover 3 being provided with a filler channel 3.1. The electromagnetic assembly 2 has a terminal connection 6, which is connected to the filler channel 3.1, and a receiving recess 2.2.1. An overcurrent protection component 4 (the overcurrent protection component 4 is a PPTC) is mounted in the receiving recess 2.2.1. A wiring harness 5, which is connected to an external power source, is attached in the filler channel 3.1.The wiring harness 5 is connected in series with the overcurrent protection component 4, the terminal connection 6, and the electromagnetic assembly 2. A liquefied epoxy resin is poured into the filling channel 3.1 and cured there, immersing the overcurrent protection component 4, the terminal connection 6, and the electrical connections between the wiring harness 5 and the overcurrent protection component 4 or the terminal connection 6. After curing, a sealed protective section is formed. A permanent magnet assembly 8 is arranged on the charging port cover 7. This assembly forms an attractive magnetic field with the electromagnetic assembly 2, causing the charging port cover 7 to remain in the closed position. When current is supplied to the electromagnetic assembly 2, it generates a magnetic field that repels the permanent magnet assembly 8, thereby driving the charging port cover 7 to open.At the same time, the heat generated by the electromagnetic assembly 2 is dissipated to the overcurrent protection component 4, thereby increasing its resistance, reducing the current flowing through the overcurrent protection component 4, and reducing the heat dissipation from the electromagnetic assembly 2 after the current supply.

[0021] The specific electromagnetic assembly 2 comprises an electromagnetic housing 2.1, a coil holder 2.2, and an iron core 2.3. The terminal connection 6 on the coil holder 2.2 includes an input terminal 6.1 and an output terminal 6.2. The receiving recess 2.2.1 is located on the coil holder 2.2 and extends through the inner and outer walls of the coil holder 2.2. The iron core 2.3 is in contact with the inner wall of the coil holder 2.2. The coil is wound around the outer wall of the coil holder 2.2, forms a thermal conductor with the sensor end of the overcurrent protection component 4, and presses the overcurrent protection component 4 against the iron core 2.3.

[0022] The thermal monitoring solution consists of connecting the lead set 5 in series with the thermally protected PPTC, and then electrically connecting it to the coil. Under normal operating conditions, the PPTC has a low resistance and therefore does not interfere with the counter-magnetic field generated by the coil. When the coil generates heat due to the continuous current flow through the circuit, the transferred thermal energy leads to a sharp increase in the resistance R of the PPTC. Due to the series connection, the output voltage remains constant, while the current through the coil assembly decreases (according to the formula I↓ = U / R↑). Consequently, the generated heat (Q↓ = I) 2The temperature difference (↓Rt) is regulated, thus preventing prolonged heating of the coil and resulting damage. Compared to conventional thermal monitoring solutions, a complex circuit design is avoided. It is sufficient to connect the PPTC in series with the coil assembly to implement the overheating protection function.

[0023] The electromagnetic housing 2.1 comprises an internally hollow electromagnetic housing body 2.1.1 and an electromagnetic housing cover 2.1.5, the two of which are joined and assembled. The outer wall of the electromagnetic housing body 2.1.1 forms a press-fit connection with the inner wall of the electromagnetic housing cover 2.1.5, and a sealing arrangement is arranged between the sections in the connection. The sealing arrangement includes an extruded groove 2.1.2 on the outer wall of the mating end of the electromagnetic housing body 2.1.1, in which the O-ring seal 2.1.3 is mounted. During assembly, the O-ring seal 2.1.3 is pressed by the inner wall of the electromagnetic housing cover 2.1.5 against the bottom surface of the extruded groove 2.1.2.

[0024] The electromagnetic housing body 2.1.1 is provided with a limiting section 2.1.4, and the coil holder 2.2 has a winding section 2.2.2 on its outer wall for winding a coil. The two axial sides of the winding section 2.2.2 are provided with a first annular disk 2.2.3 and a second annular disk 2.2.4, respectively, which bear against the inner wall of the electromagnetic housing body 2.1.1. During the assembly of the electromagnetic housing cover 2.1.5 and the electromagnetic housing body 2.1.1, the electromagnetic housing cover 2.1.5 bears against the second annular disk 2.2.4, thereby moving the coil holder 2.2 as a whole towards the limiting section 2.1.4, so that the end face of the first annular disk 2.2.3 presses against the limiting section 2.1.4.

[0025] The input terminal 6.1 and the output terminal 6.2 are each arranged on two projecting projections 2.2.5 on the second ring disk 2.2.4 along the assembly direction. During assembly, the outer walls of the two projecting projections 2.2.5 are each inserted into two locating holes 2.1.6 on the electromagnetic housing cover 2.1.5 in a plug-in connection. A mounting groove 2.2.6 is arranged on each projecting projection 2.2.5, with the protective cover 3 being provided with two positioning projections 3.2, which are each inserted into the mounting grooves 2.2.6 in a plug-in connection.

[0026] The permanent magnet assembly 8 is formed by a magnetic mounting base 8.1, which is mounted on the charging port cover 7. The front end of the electromagnetic housing body 2.1.1 is equipped with an attracting end face 2.1.7. When the permanent magnet assembly 8 is in the closed position, the attracting end face 2.1.7 is aligned with the end face of the magnetic mounting base 8.1. The end face of the magnetic mounting base 8.1 has a mounting groove 8.1.1 in which the magnet 8.2 is mounted. A working air gap 8.3 is formed between the magnet 8.2 and the attracting end face 2.1.7, with the working air gap 8.3 being 0.1 to 0.8 mm. An attractive magnetic field is generated between the magnet 8.2 and the attracting end face 2.1.7, which holds the charging port cover 7 in the closed position. The magnetic force generated between the magnet steel and the attracting end face is ≤ 200 N.

[0027] The foregoing description relates only to preferred embodiments of the present invention and should not be construed as limiting the claims. The present invention is not limited to the embodiments mentioned above, and variations in its specific structure are permissible. All variations made within the scope of protection of the independent claims of the present invention are covered by the scope of protection of the present invention. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 212529337

[0004] CN 209208514U

[0004]

Claims

[1] Electromagnetic locking device for a charging port cover of a new energy vehicle, characterized by , comprising a charging port box (1) and a charging port cover (7) which is connected to the charging port box (1) along a pivot line and is pivotable about the pivot line between a closed position and an open position; wherein the charging port cover (7) is arranged at the front end of the charging port box (1), an electromagnetic assembly (2) is arranged on the charging port box (1), and a permanent magnet assembly (8) is arranged on the charging port cover (7), wherein in the closed position the permanent magnet assembly (8) is arranged opposite the charging port cover (7): Without a power supply to the electromagnetic assembly (2), the permanent magnet assembly (8) generates an attractive magnetic field with the electromagnetic assembly (2), which keeps the charging port cover (7) in the closed position; When current is supplied to the electromagnetic assembly (2), the electromagnetic assembly (2) generates a magnetic field that repels the permanent magnet assembly (8), whereby a repulsive magnetic force causes the charging port cover (7) to rotate in the direction of the open position; the charging connection box (1) further comprises a protective cover (3), wherein the protective cover (3) is arranged at the rear end of the electromagnetic assembly (2), the protective cover (3) is provided with a filling channel (3.1), wherein the electromagnetic assembly (2) is provided with a terminal connection (6) connected to the filling channel (3.1) and a receiving recess (2.2.1), wherein an overcurrent protection component (4) is arranged in the receiving recess (2.2.1), which forms a heat conductor with the electromagnetic assembly (2), and a conductor set (5) connected to an external power source is attached in the filling channel (3.1), wherein the conductor set (5) is connected in series with the overcurrent protection component (4), the terminal connection (6) and the electromagnetic assembly (2); wherein the heat generated after the current supply to the electromagnetic assembly (2) is dissipated to the overcurrent protection component (4), the resistance of the overcurrent protection component (4) is increased, thereby reducing the current flowing through the overcurrent protection component (4) and thus reducing the heat generated by the electromagnetic assembly (2); and wherein a liquefied epoxy resin is poured into the filling channel (3.1), the overcurrent protection component (4), the terminal connection (6) and the electrical connections between the wiring harness (5) and the overcurrent protection component (4) or the terminal connection (6) are immersed, and after curing a protective section is formed in the filling channel which seals the electromagnetic assembly (2). [2] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 1, characterized by, that the electromagnetic assembly (2) comprises an electromagnetic housing (2.1), a coil holder (2.2), and an iron core (2.3), each mounted in the electromagnetic housing (2.1), wherein the terminal connection (6) comprises an input terminal (6.1) and an output terminal (6.2) arranged on the coil holder (2.2), wherein the receiving recess (2.2.1) is arranged on the coil holder (2.2) and simultaneously penetrates the inner and outer walls of the coil holder (2.2), wherein the iron core (2.3) is in plug connection with the inner wall of the coil holder (2.2), wherein a coil is wound around the outer wall of the coil holder (2.2), the coil entering via the input terminal (6.1) and exiting via the output terminal (6.2).2) exits, and the coil is in contact with the sensor end of the overcurrent protection component (4) during winding, thereby forming a heat conduction, and presses the overcurrent protection component (4) against the outer wall of the iron core (2.3). [3] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 2, characterized by, that the electromagnetic housing (2.1) comprises an internally hollow electromagnetic housing body (2.1.1) and an electromagnetic housing cover (2.1.5), wherein the electromagnetic housing body (2.1.1) and the electromagnetic housing cover (2.1.5) are joined and mounted together in a relative assembly direction to each other, wherein the outer wall of the fitting end of the electromagnetic housing body (2.1.1) forms a press-fit connection with the inner wall of the fitting end of the electromagnetic housing cover (2.1.5), wherein a sealing arrangement is arranged between the sections standing in the plug connection. [4] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 3, characterized by, that the sealing arrangement comprises an extruded groove (2.1.2) arranged circumferentially on the outer wall of the fitting end of the electromagnetic housing body (2.1.1), wherein an O-ring seal (2.1.3) is fitted in the extruded groove (2.1.2), wherein during the joining and assembly of the electromagnetic housing body (2.1.1) and the electromagnetic housing cover (2.1.5) the inner wall of the fitting end of the electromagnetic housing cover (2.1.5) bears against the O-ring seal (2.1.3) and the O-ring seal (2.1.3) presses against the bottom surface of the extruded groove (2.1.2). [5] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 3, characterized bythat the electromagnetic housing body (2.1.1) is provided with a limiting section (2.1.4), and the coil holder (2.2) is mounted in the electromagnetic housing body (2.1.1) and has a winding section (2.2.2) on its outer wall for winding a currentable coil, wherein the two axial sides of the winding section (2.2.2) are provided with a first annular disk (2.2.3) and a second annular disk (2.2.4) respectively, each with a radial outer edge, the radial outer edges of which each bear against the inner wall of the electromagnetic housing body (2.1.1), wherein during the joining and assembly of the electromagnetic housing cover (2.1.5) and the electromagnetic housing body (2.1.1), the electromagnetic housing cover (2.1.5) bears against the second annular disk (2.2.4), thereby moving the coil holder (2.2) as a whole in the direction of the limiting section (2.1.4) is moved until the end face of the first ring disk (2.2.3) presses against the boundary section (2.1.4). [6] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 3, characterized by, that the input terminal connection (6.1) and the output terminal connection (6.2) are each arranged on two projecting projections (2.2.5) on the second ring disk (2.2.4) along the assembly direction, wherein during the assembly and mounting of the electromagnetic housing cover (2.1.5) and the electromagnetic housing body (2.1.1) the outer walls of the two projecting projections (2.2.5) are each inserted into two locating holes (2.1.6) on the electromagnetic housing cover (2.1.5) in a plug-in manner, wherein a mounting groove (2.2.6) is arranged on each projecting projection (2.2.5), wherein the protective cover (3) is provided with two positioning projections (3.2), wherein the positioning projections (3.2) are each inserted into the two mounting grooves (2.2.6) in a plug-in manner. [7] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 5, characterized by, that the permanent magnet assembly (8) comprises a magnet mounting base (8.1) mounted on the charging port cover (7), and an attracting end face (2.1.7) is arranged at the front end of the electromagnetic housing body (2.1.1), wherein in the closed position of the permanent magnet assembly (8) the attracting end face (2.1.7) corresponds to the end face of the magnet mounting base (8.1), wherein a mounting groove (8.1.1) is arranged on the end face of the magnet mounting base (8.1), wherein a magnet steel (8.2) is arranged in the mounting groove (8.1.1), wherein a working air gap (8.3) is formed between the magnet steel (8.2) and the attracting end face (2.1.7), and an attracting magnetic field is generated with the attracting end face (2.1.7). [8] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 7, characterized by, that the working air gap (8.3) is 0.1 to 0.8 mm. [9] Electromagnetic locking device for a charging port cover of a new energy vehicle according to claim 7, characterized by , that the attractive magnetic force generated between the magnet steel (8.2) and the attracting end face (2.1.7) is ≤ 200 N.

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