An electric vehicle circuit connection end head preventing falling off
By employing a four-point positioning and fully enclosed sealing unit design, the problem of screw corrosion and detachment caused by dust and moisture intrusion at the electric vehicle charging terminal under complex working conditions is solved, thus achieving stability and safety of the electric vehicle circuit connection.
Patent Information
- Application Number
- CN202521755413.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-18
AI Technical Summary
Existing electric vehicle charging terminals are prone to screw corrosion due to dust and moisture intrusion under complex working conditions, which can lead to detachment.
It adopts a four-point positioning structure and a fully enclosed sealing unit design. Through mechanical linkage, it automatically aligns the screw hole and threaded hole during the insertion stage. The elastically driven sealing plate covers the screw head to form a physical isolation layer. The rectangularly distributed screws form a spatial rigid frame structure to disperse vibration loads and enhance the reliability of primary fixation.
It effectively blocks the intrusion paths of dust and moisture, prevents screw corrosion, ensures that the charging terminal does not fall off under complex working conditions, and improves the stability and safety of electric vehicle circuit connections.
Smart Images
Figure CN224683539U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit connection terminal technology, and in particular to an electric vehicle circuit connection terminal that prevents detachment. Background Technology
[0002] As a new type of green transportation, the reliability of the electrical system of electric vehicles directly affects the overall vehicle performance and safety. The circuit connection terminal of an electric vehicle is the charging terminal, which is the core interface between the electric vehicle and the charging facility, and undertakes the dual functions of power transmission and signal interaction.
[0003] When the circuit connection terminal is in use, the existing technology for fixing electric vehicle charging terminals usually adopts a direct screw fastening structure. Under complex working conditions such as outdoor riding, humidity, or dust, the existing protective measures are difficult to completely prevent the external environment from corroding the screws. Specifically, the screw head is directly exposed in the mounting groove, the sealing ring can only achieve static sealing and cannot cope with the gap changes under dynamic vibration, and the simple cover plate is prone to sealing failure due to frequent opening and closing. In long-term use, dust and moisture enter the interior through the gap between the screw hole and the threaded hole, forming a rust layer on the metal surface. At the same time, the multi-dimensional vibration load generated by the electric vehicle, such as longitudinal bumps and lateral swings, will accelerate the loosening of the screws and eventually cause the charging terminal to fall off.
[0004] Therefore, to address the problem of dust and moisture intrusion leading to thread corrosion and subsequent detachment of the charging terminal, an electric vehicle circuit connection terminal designed to prevent detachment can be implemented. This solution addresses the aforementioned technical issues through innovative mechanical linkage and multi-level protection design. First, a four-point positioning structure automatically aligns the screw holes and threaded holes during the charging terminal insertion stage, ensuring installation accuracy. Second, a fully enclosed sealing unit is designed, with an elastically driven sealing plate covering the screw head to form a physical isolation layer, completely blocking the intrusion path of dust and moisture. Third, utilizing the symmetrical action characteristics of four independent sealing units, combined with rectangularly distributed screws, a spatial rigid frame structure is formed, evenly distributing multi-dimensional vibration loads to the shell and avoiding localized stress concentration. Finally, the self-locking characteristics of the threaded pair enhance the reliability of the initial fixation. This design constructs a composite protection system from three dimensions: installation positioning, environmental isolation, and load distribution, effectively solving the problem of charging terminal detachment due to screw corrosion under complex operating conditions. Utility Model Content
[0005] To address the issue that electric vehicle charging terminals are typically secured with screws during use, in complex conditions such as outdoor riding, dampness, or dust, the screw heads are directly exposed in the mounting slot. Over time, dust and moisture can penetrate the interior through the gap between the screw hole and the threaded hole, forming a rust layer on the metal surface, which makes it difficult to prevent the charging terminal from falling off.
[0006] The technical solution of this utility model is as follows: an electric vehicle circuit connection terminal to prevent detachment, comprising an electric vehicle housing, a mounting hole, a mounting groove, a threaded hole, a charging terminal, an outer edge plate, a sealing groove, a sealing plate, screw holes, fastening screws, and guide components. The side wall of the electric vehicle housing has a through mounting hole and a mounting groove. Two sets of threaded holes are provided on both sides of the inner wall of the mounting groove. The charging terminal is disposed inside the mounting hole. An outer edge plate is fixedly disposed on the front side wall of the charging terminal. Two sets of sealing grooves are provided on both sides of the outer wall of the outer edge plate. A sealing plate is disposed inside the sealing groove. A screw hole is provided through the inner wall of the sealing groove. A fastening screw is disposed inside the screw hole. Two sets of guide components are provided on both sides of the inner wall of the outer edge plate.
[0007] Preferably, when the circuit connection terminal is in use, during the initial installation stage of the charging terminal, the operator inserts the charging terminal horizontally into the mounting hole on the side wall of the electric vehicle housing. At this time, the outer edge plate at the front end of the charging terminal is fully inserted into the mounting groove and forms surface contact with the groove wall. The multiple sets of threaded holes preset on the inner wall of the mounting groove and the multiple sets of screw holes preset on the side wall of the outer edge plate automatically align, forming a four-point positioning structure. After confirming the hole alignment, the operator pushes the sealing plate towards the inside of the sealing groove. When the sealing plate is fully opened, the screw holes are fully exposed, and the four sets of independent sealing units move synchronously to form a symmetrical structure. The load-bearing structure involves sequentially passing the fastening screws through the exposed screw holes and screwing them into the threaded holes. The self-locking characteristic of the threaded pair forms a primary fixation. The four sets of screws are arranged in a rectangular pattern, forming a spatial rigid frame structure within the mounting groove. This effectively disperses the multidimensional vibration loads during electric vehicle operation. After the screws are tightened, the sealing plate is released, and the elastic potential energy pushes the sealing plate to re-cover the heads of the fastening screws, forming a physical isolation layer. In summary, this design constructs a composite protection system from three dimensions: installation positioning, environmental isolation, and load dispersion. It effectively solves the problem of charging terminals falling off due to screw corrosion under complex working conditions.
[0008] Preferably, the mounting groove and the mounting hole are connected through each other, the outer edge plate is set inside the mounting groove, the inner wall of the outer edge plate is in contact with the inner wall of the mounting groove, and the fastening screw is threadedly connected to the threaded hole.
[0009] Preferably, the guide assembly includes a guide cavity, a guide rod, and a guide seat. Two sets of guide cavities are provided on both sides of the inner edge plate. A guide rod is fixedly installed inside the guide cavity, and a guide seat is provided on the side wall of the guide rod.
[0010] Preferably, the guide assembly also includes a return spring, which is provided inside the guide cavity. One end of the return spring is fixedly connected to the inner wall of the guide seat, and the other end of the return spring is fixedly connected to the inner wall of the guide cavity. The return spring is located outside the guide rod.
[0011] Preferably, the guide cavity is connected to the sealing groove, the guide seat is slidably connected to the guide rod, and the inner wall of the sealing plate is fixedly connected to the side wall of the guide seat.
[0012] Preferably, the charging end has a charger plug inside, and limit frames are fixedly installed on both sides of the outer wall of the charger plug, while connecting shafts are installed on both sides of the outer wall of the outer edge plate.
[0013] Preferably, a limiting plate is provided at the outer end of the connecting shaft, and one end of the limiting plate is engaged with the inside of the limiting frame.
[0014] The beneficial effects of this utility model are:
[0015] When the circuit connection terminal is in use, during the initial installation phase, the operator inserts the charging terminal horizontally into the mounting hole on the side wall of the electric vehicle housing. At this time, the outer edge plate at the front end of the charging terminal is fully inserted into the mounting groove and forms surface contact with the groove wall. The multiple sets of threaded holes pre-set on the inner wall of the mounting groove and the multiple sets of screw holes pre-set on the side wall of the outer edge plate automatically align, forming a four-point positioning structure. After confirming the hole alignment, the operator pushes the sealing plate towards the inside of the sealing groove. When the sealing plate is fully opened, the screw holes are fully exposed, and the four sets of independent sealing units act synchronously to form symmetrical force. The structure involves sequentially passing fastening screws through exposed screw holes and screwing them into threaded holes. The self-locking property of the threaded pair forms a primary fixation. The four sets of screws are arranged in a rectangular pattern, forming a spatial rigid frame structure within the mounting slot. This effectively disperses the multidimensional vibration loads during electric vehicle operation. After the screws are tightened, the sealing plate is released, and the elastic potential energy pushes the sealing plate to re-cover the heads of the fastening screws, forming a physical isolation layer. In summary, this design constructs a composite protection system from three dimensions: installation positioning, environmental isolation, and load dispersion. It effectively solves the problem of charging terminals falling off due to screw corrosion under complex working conditions. Attached Figure Description
[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of an electric vehicle circuit connection terminal designed to prevent detachment according to this utility model.
[0017] Figure 2 The diagram shown is a three-dimensional structural diagram of the first outer periphery of a charging terminal of an electric vehicle circuit connection terminal that is designed to prevent detachment according to this utility model.
[0018] Figure 3The diagram shown is a three-dimensional structural representation of the second outer periphery of a charging terminal of an electric vehicle circuit connection terminal that is designed to prevent detachment according to this utility model.
[0019] Figure 4 The diagram shown is a partial three-dimensional structural schematic of a circuit connection terminal for an electric vehicle that is designed to prevent detachment according to this utility model.
[0020] Figure 5 The diagram shown is a partial three-dimensional structural schematic of a circuit connection terminal for electric vehicles that is designed to prevent detachment according to this utility model.
[0021] Explanation of reference numerals in the attached drawings: 1. Electric vehicle housing; 2. Mounting hole; 3. Mounting groove; 4. Threaded hole; 5. Charging terminal; 6. Outer edge plate; 7. Sealing groove; 8. Sealing plate; 9. Screw hole; 10. Fastening screw; 11. Guide cavity; 12. Guide rod; 13. Guide seat; 14. Return spring; 15. Charger plug; 16. Limit frame; 17. Connecting shaft; 18. Limit plate. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Please see Figure 1 and Figure 3 This utility model provides an embodiment of an electric vehicle circuit connection terminal designed to prevent detachment, comprising an electric vehicle housing 1, a mounting hole 2, a mounting groove 3, a threaded hole 4, a charging terminal 5, an outer edge plate 6, a sealing groove 7, a sealing plate 8, screw holes 9, fastening screws 10, and guide components. The side wall of the electric vehicle housing 1 has a through-hole 2 and a mounting groove 3. Two sets of threaded holes 4 are formed on both sides of the inner wall of the mounting groove 3. The charging terminal 5 is disposed inside the mounting hole 2. An outer edge plate 6 is fixedly disposed on the front side wall of the charging terminal 5. Two sets of sealing grooves 7 are formed on both sides of the outer wall of the outer edge plate 6. A sealing plate 8 is disposed inside the sealing groove 7. A screw hole 9 is formed through the inner wall of the sealing groove 7. A fastening screw 10 is disposed inside the screw hole 9. Two sets of guide components are formed on both sides of the inner interior of the outer edge plate 6.
[0024] Please see Figure 3 and Figure 4The mounting groove 3 is connected to the mounting hole 2. The outer edge plate 6 is set inside the mounting groove 3, and the inner wall of the outer edge plate 6 abuts against the inner wall of the mounting groove 3. The fastening screw 10 is threadedly connected to the threaded hole 4. The operator inserts the charging terminal 5 horizontally into the mounting hole 2 on the side wall of the electric vehicle housing 1. At this time, the outer edge plate 6 at the front end of the charging terminal 5 is completely inserted into the mounting groove 3 and forms a surface contact with the groove wall. The guide assembly includes a guide cavity 11, a guide rod 12, and a guide seat 13. Two sets of guide cavities 11 are opened on both sides of the inner side of the outer edge plate 6. A guide rod 12 is fixedly installed inside the guide cavity 11, and a guide seat 13 is installed on the side wall of the guide rod 12. The guide seat 13 slides along the guide rod 12. The guide assembly also includes a return spring 14. The return spring 14 is installed inside the guide cavity 11. One end of the return spring 14 is fixedly connected to the inner wall of the guide seat 13, and the other end of the return spring 14 is fixedly connected to the inner wall of the guide cavity 11. The return spring 14 is located outside the guide rod 12. The return spring 14 releases elastic potential energy to push the guide seat 13 to reset.
[0025] Please see Figure 2 and Figure 5 The guide cavity 11 is connected to the sealing groove 7, the guide seat 13 is slidably connected to the guide rod 12, the inner wall of the sealing plate 8 is fixedly connected to the side wall of the guide seat 13, and the guide seat 13 drives the sealing plate 8 to cover the head of the fastening screw 10 to form a physical isolation layer. The charging end 5 is provided with a charger plug 15 inside, and the outer walls of the charger plug 15 are fixedly provided with limit frames 16 on both sides. The outer walls of the outer edge plate 6 are provided with connecting shafts 17 on both sides. When the charger plug 15 is inserted into the charging end 5, the outer end of the connecting shaft 17 is rotatably provided with a limit plate 18. One end of the limit plate 18 is engaged with the inside of the limit frame 16. When the charger plug 15 is inserted into the charging end 5, the limit plates 18 on both sides of the outer edge plate 6 are rotated to make them rotate around the connecting shaft 17. The end of the limit plate 18 is engaged with the inside of the limit frame 16 in a tenon-and-mortise type engagement. By replacing the traditional point contact with surface contact, the shear stress is converted into compressive stress to achieve a locking effect.
[0026] When the circuit connection terminal is in use, during the initial installation stage of the charging terminal 5, the operator inserts the charging terminal 5 into the mounting hole 2 on the side wall of the electric vehicle housing 1 in a horizontal direction. At this time, the outer edge plate 6 at the front end of the charging terminal 5 is fully inserted into the mounting groove 3 and forms a surface contact with the groove wall. The multiple sets of threaded holes 4 preset on the inner wall of the mounting groove 3 and the multiple sets of screw holes 9 preset on the side wall of the outer edge plate 6 are automatically aligned to form a four-point positioning structure base.
[0027] After confirming the alignment of the holes, the operator pushes the sealing plate 8 towards the inside of the sealing groove 7. The sealing plate 8 slides along the guide rod 12 through the guide seat 13 fixed on the inner wall. The clearance fit between the guide rod 12 and the guide seat 13 ensures the straightness of the movement trajectory. At this time, the return spring 14 is compressed and stores energy.
[0028] When the sealing plate 8 is fully opened, the screw holes 9 are fully exposed. The four independent sealing units act synchronously to form a symmetrical force structure. The fastening screws 10 are passed through the exposed screw holes 9 and screwed into the threaded holes 4 in sequence. The self-locking characteristic of the threaded pair forms a primary fixation. The four sets of screws are distributed in a rectangular shape and form a spatial rigid frame structure in the mounting groove 3, which effectively disperses the multidimensional vibration load during the electric vehicle's operation. After the screws are tightened, the sealing plate 8 is released. The return spring 14 releases elastic potential energy to push the guide seat 13 to reset. The guide seat 13 drives the sealing plate 8 to cover the head of the fastening screws 10 again, forming a physical isolation layer.
[0029] When the charger plug 15 is inserted into the charging terminal 5, the limiting plates 18 on both sides of the outer edge plate 6 are rotated to make them rotate around the connecting shaft 17. The end of the limiting plate 18 forms a tenon-and-mortise engagement with the inside of the limiting frame 16. By replacing the traditional point contact with surface contact, the shear stress is converted into compressive stress, thereby achieving a locking effect.
[0030] In summary, this technical solution, through innovative mechanical linkage and multi-level protection design, effectively solves the problem of electric vehicle charging interfaces falling off under complex working conditions by blocking the screws from contact with the external environment through a fully enclosed sealing structure, eliminating the problem of screw corrosion caused by dust and moisture intrusion.
[0031] Through the above steps, when the circuit connection terminal is in use, during the initial installation stage of the charging terminal 5, the operator inserts the charging terminal 5 horizontally into the mounting hole 2 on the side wall of the electric vehicle housing 1. At this time, the outer edge plate 6 at the front end of the charging terminal 5 is fully inserted into the mounting groove 3 and forms surface contact with the groove wall. The multiple sets of threaded holes 4 preset on the inner wall of the mounting groove 3 and the multiple sets of screw holes 9 preset on the side wall of the outer edge plate 6 are automatically aligned, forming a four-point positioning structure foundation. After confirming the hole alignment, the operator pushes the sealing plate 8 towards the inside of the sealing groove 7. When the sealing plate 8 is fully opened, the screw holes 9 are fully exposed, and the four sets of independent sealing units operate synchronously. A symmetrical force-bearing structure is formed. The fastening screws 10 are passed through the exposed screw holes 9 and screwed into the threaded holes 4 in sequence. The self-locking characteristic of the threaded pair forms a primary fixation. The four sets of screws are distributed in a rectangular shape, forming a spatial rigid frame structure in the mounting groove 3, which effectively disperses the multidimensional vibration loads during the operation of the electric vehicle. After the screws are tightened, the sealing plate 8 is released. The elastic potential energy pushes the sealing plate 8 to cover the head of the fastening screws 10 again, forming a physical isolation layer. In summary, this design constructs a composite protection system from three dimensions: installation positioning, environmental isolation, and load dispersion, which effectively solves the problem of the charging terminal 5 falling off due to screw corrosion under complex working conditions.
[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A circuit connection terminal for electric vehicles that prevents detachment, comprising an electric vehicle housing (1), characterized in that: It also includes mounting holes (2), mounting grooves (3), threaded holes (4), charging terminals (5), outer edge plates (6), sealing grooves (7), sealing plates (8), screw holes (9), fastening screws (10) and guide components. The side wall of the electric vehicle housing (1) is provided with mounting holes (2), the side wall of the electric vehicle housing (1) is provided with mounting grooves (3), the inner walls of the mounting grooves (3) are provided with two sets of threaded holes (4) on both sides, the inside of the mounting holes (2) is provided with charging terminals (5), the front side wall of the charging terminals (5) is fixedly provided with outer edge plates (6), the outer walls of the outer edge plates (6) are provided with two sets of sealing grooves (7), the inside of the sealing grooves (7) is provided with sealing plates (8), the inner walls of the sealing grooves (7) are provided with screw holes (9), the inside of the screw holes (9) is provided with fastening screws (10), and the inner walls of the outer edge plates (6) are provided with two sets of guide components on both sides.
2. The electric vehicle circuit connection terminal for preventing detachment according to claim 1, characterized in that: The mounting groove (3) is connected to the mounting hole (2), the outer edge plate (6) is set inside the mounting groove (3), the inner wall of the outer edge plate (6) is in contact with the inner wall of the mounting groove (3), and the fastening screw (10) is threadedly connected to the threaded hole (4).
3. The electric vehicle circuit connection terminal for preventing detachment according to claim 1, characterized in that: The guide assembly includes a guide cavity (11), a guide rod (12), and a guide seat (13). Two sets of guide cavities (11) are provided on both sides of the inner edge plate (6). The guide rod (12) is fixedly installed inside the guide cavity (11), and the guide seat (13) is provided on the side wall of the guide rod (12).
4. The electric vehicle circuit connection terminal for preventing detachment according to claim 3, characterized in that: The guide assembly also includes a reset spring (14). The reset spring (14) is provided inside the guide cavity (11). One end of the reset spring (14) is fixedly connected to the inner wall of the guide seat (13), and the other end of the reset spring (14) is fixedly connected to the inner wall of the guide cavity (11). The reset spring (14) is located outside the guide rod (12).
5. The electric vehicle circuit connection terminal for preventing detachment according to claim 3, characterized in that: The guide cavity (11) is connected to the sealing groove (7), the guide seat (13) is slidably connected to the guide rod (12), and the inner wall of the sealing plate (8) is fixedly connected to the side wall of the guide seat (13).
6. The electric vehicle circuit connection terminal for preventing detachment according to claim 1, characterized in that: The charging end (5) is equipped with a charger plug (15), and limit frames (16) are fixedly installed on both sides of the outer wall of the charger plug (15). Connecting shafts (17) are installed on both sides of the outer wall of the outer edge plate (6).
7. The electric vehicle circuit connection terminal for preventing detachment according to claim 6, characterized in that: A limiting plate (18) is rotatably provided at the outer end of the connecting shaft (17), and one end of the limiting plate (18) is engaged with the inside of the limiting frame (16).