A large current charging base

Abstract

The utility model relates to a big current -carrying charging seat, include: shell, the shell one side is equipped with alternating current socket and direct current socket, alternating current socket and direct current socket all are equipped with first mounting hole in, terminal body, the terminal body has a plurality of, and respectively insert first mounting hole in on alternating current socket and direct current socket, and pass through second mounting hole on the cover, the terminal body is equipped with terminal section, in the utility model, through being equipped with terminal body and the screw hole and terminal section that terminal body is equipped with, make cable when with terminal connection, can contact connection with screw hole peripheral wall and terminal body outer surface simultaneously, effectively enlarged the contact area between terminal and cable, and the screw hole peripheral wall surface can act as the electric connection surface, thereby make the contact area with cable after connection bigger, and the connection is more stable, and the current -carrying ability can improve, thereby improve charging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of charging stand technology, specifically a high current-carrying charging stand. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for faster charging speeds is growing. A charging dock is a stand used to connect with a plug during charging. It is usually installed at the charging port of a car to connect to an external charging station for charging.

[0003] Currently, in the early design of charging docks, cables are used to connect to terminals inside the charging dock cavity to ensure the current carrying capacity of the product. However, the existing connection methods between terminals and cables are generally crimped or welded. This connection method means that the terminals and cables only make contact with each other on opposite surfaces, resulting in a small connection and contact area between the cables and terminals, which in turn makes the current carrying capacity unable to meet the requirements of the current charging speed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high-current-carrying charging socket that uses screw connection and increases the terminal cross-sectional area, thereby solving the technical problem that the existing connection method with the terminal has a small contact area, resulting in the current-carrying capacity not meeting the charging speed requirements.

[0005] The present invention provides a high current-carrying charging base, comprising: a housing, wherein an AC socket and a DC socket are provided on one side of the housing, and a first mounting hole is provided in both the AC socket and the DC socket;

[0006] A cover plate is provided on the side of the housing away from the AC socket and the DC socket, and a second mounting hole is provided through the cover plate;

[0007] The terminal body has multiple terminals, which are respectively inserted into the first mounting holes on the AC socket and the DC socket, and pass through the second mounting holes on the cover plate. The terminal body has a terminal cross section, and the position of the terminal cross section exposed outside the second mounting hole has a screw hole for connecting to an external cable.

[0008] As a further improvement of this utility model, the terminal body includes a first terminal and a second terminal, the length of the first terminal is greater than that of the second terminal, and the center positions of the screw holes on the first terminal and the second terminal are not on the same vertical line.

[0009] As a further improvement of this utility model, both the first terminal and the second terminal include a plug-in portion and a connecting portion. A boss is integrally formed between the plug-in portion and the connecting portion. The plug-in portion is a cylinder, and the connecting portion includes two terminal cross sections.

[0010] As a further improvement of this utility model, the boss includes a stop surface and an abutment surface. The stop surface is located on the side of the boss near the insertion part, and the abutment surface is located on the side of the boss near the connection part.

[0011] As a further improvement of this utility model, the shape and size of the second mounting hole are adapted to the shape and size of the terminal body connection part, and the second mounting hole and the first mounting hole are located on the same axis.

[0012] As a further improvement of this utility model, the inner wall of the first mounting hole is provided with an end face. After the connecting part of the terminal body is inserted into the first mounting hole, the abutting surface fits against the end face inside the first mounting hole. The end face is used to limit the insertion depth of the terminal body.

[0013] As a further improvement of this utility model, the outer shell is provided with a first threaded hole at each of the four corners near the cover plate, and the cover plate is provided with a second threaded hole at the position corresponding to the first threaded hole. The outer shell and the cover plate are connected and fixed by screws through the first threaded hole and the second threaded hole.

[0014] As a further improvement of this utility model, the cover plate is provided with buckles on both sides, and the outer shell is provided with snap points on both sides corresponding to the buckles. The outer shell and the cover plate can be connected by the buckles and the snap points. The inner side of the cover plate is provided with a pressing surface that fits against the stop surface.

[0015] As a further improvement of this utility model, the outer shell is equipped with an electromagnetic lock for locking during charging, and the electromagnetic lock is provided with a manual unlocking rope for emergency unlocking.

[0016] As a further improvement of this utility model, a temperature sensor for detecting temperature is provided inside the cover plate near the terminal body.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In this invention, by setting the terminal body and the screw hole and terminal cross-section on the terminal body, the cable can simultaneously contact and connect with the peripheral wall of the screw hole and the outer surface of the terminal body when connected to the terminal. This effectively expands the contact area between the terminal and the cable. The peripheral wall of the screw hole can act as an electrical connection surface, thereby making the contact area with the cable larger after connection, the connection more stable, and the current carrying capacity improved, thus improving the charging efficiency. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional exploded structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall three-dimensional front view of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall three-dimensional rear view structure of this utility model;

[0023] Figure 4 This is a three-dimensional structural diagram of the terminal body of this utility model;

[0024] Figure 5 This is a schematic diagram of the overall top sectional view of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the AC and DC sockets of this utility model;

[0026] Figure 7 This is a top view of the overall structure of this utility model.

[0027] In the diagram: 1. Outer shell; 11. AC socket; 12. DC socket; 13. First mounting hole; 14. End face; 15. First threaded hole; 16. Fastening point; 2. Terminal body; 21. Terminal cross-section; 22. Screw hole; 23. Stop surface; 24. Abutment surface; 25. First terminal; 26. Second terminal; 201. Insertion part; 202. Connecting part; 203. Boss; 3. Electromagnetic lock; 31. Manual unlocking rope; 4. Cover plate; 41. Second threaded hole; 42. Second mounting hole; 43. Crimping surface; 44. Buckle; 5. Temperature sensor. Detailed Implementation

[0028] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] Please see Figure 1-7 The present invention provides a high current-carrying charging base, comprising: a housing 1, wherein an AC socket 11 and a DC socket 12 are provided on one side of the housing 1, and a first mounting hole 13 is provided in both the AC socket 11 and the DC socket 12;

[0033] Cover plate 4 is located on the side of the outer casing 1 away from the AC socket 11 and the DC socket 12, and a second mounting hole 42 is provided through the cover plate 4.

[0034] Terminal body 2, there are multiple terminals, which are respectively inserted into the first mounting holes 13 on the AC socket 11 and the DC socket 12, and pass through the second mounting holes 42 on the cover plate 4. The terminal body 2 has a terminal cross section 21, and the terminal cross section 21 exposed at the position of the second mounting hole 42 has a screw hole 22 for connecting with external cables.

[0035] The outer shell 1 refers to the external protective structure of the charging base, which can be made of flame-retardant plastic or metal. The AC socket 11 and DC socket 12 refer to the interfaces for connecting AC power and DC power, respectively, and their specifications can be adapted to national standard plugs or specific plug models. The first mounting hole 13 is a through hole set inside the socket for fixing the terminal body 2, and its hole diameter matches the diameter of the terminal body 2. The terminal body 2 is a conductive metal component, which can be made of conductive materials such as copper alloy, and its cross-sectional shape can be circular, square or other polygonal. The screw hole 22 refers to the threaded hole that passes through the terminal cross-section 21 for bolt connection, and can adopt standard thread specifications such as M3-M6. The cover plate 4 is a protective plate covering the back of the outer shell 1, and its material can be the same as or different from that of the outer shell 1. The second mounting hole 42 is a through hole on the cover plate 4 for the terminal to pass through, and its position corresponds to the first mounting hole 13.

[0036] The terminal body 2 is connected to the outer shell 1 by insertion. After one end of the terminal body 2 is inserted into the first mounting hole 13, it can be fixed by interference fit, thread fastening or snap-fit ​​structure 44. The screw hole 22 on the terminal body 2 is used to connect to the wiring terminal of the external cable by bolt. Flat head bolts and washers can be used to achieve reliable electrical connection. The cover plate 4 and the outer shell 1 can be assembled by snap-fit ​​44, screws or slide rails. After assembly, the part of the terminal body 2 that passes through the second mounting hole 42 can be exposed for wiring. Waterproofing can also be achieved by sealing ring. The AC socket 11 and DC socket 12 can be arranged on the outer shell 1 in various layouts such as side by side, stacked on top of each other or arranged in sections.

[0037] The technical feature that one end of the terminal body 2 passes through and protrudes from the second mounting hole 42 means that after the cover plate 4 is installed in place, the terminal body 2 extends a certain length outward from the cover plate 4. The purpose of this design is to ensure sufficient operating space when connecting external cables. The length of the protruding part is usually 5-15mm, which ensures connection reliability and avoids excessive exposure. The position near the end on the terminal cross-section 21 means that the screw hole 22 is opened at about 1 / 3-1 / 4 of the length from the end of the terminal body 2. This position can ensure connection strength and facilitate tool operation.

[0038] The modified design achieves a compact layout of AC and DC integrated charging interfaces through the modular design of the outer shell 1, terminal body 2 and cover plate 4. The structural design of the terminal body 2 directly penetrating the outer shell 1 and cover plate 4 greatly simplifies the internal wiring and reduces contact resistance. The connection method using screw holes 22 is easier to maintain and replace than welding. The protruding terminal design improves the convenience of wiring operations. The cooperation of the first mounting hole 13 and the second mounting hole 42 ensures the terminal positioning accuracy.

[0039] Please see Figure 1 and Figure 4In this embodiment, the terminal body 2 includes a first terminal 25 and a second terminal 26. The length of the first terminal 25 is greater than that of the second terminal 26. The center positions of the screw holes 22 on the first terminal 25 and the second terminal 26 are not on the same vertical line.

[0040] Both the first terminal 25 and the second terminal 26 include a plug-in portion 201 and a connecting portion 202. A boss 203 is integrally formed between the plug-in portion 201 and the connecting portion 202. The plug-in portion 201 is a cylinder, and the connecting portion 202 includes two terminal cross sections 21.

[0041] The boss 203 includes a stop surface 23 and an abutment surface 24. The stop surface 23 is located on the side of the boss 203 near the insertion part 201, and the abutment surface 24 is located on the side of the boss 203 near the connecting part 202.

[0042] The first terminal and the second terminal refer to two conductive components of different lengths in the terminal body 2, which can be made of copper or copper alloy material, and the length difference is usually 5-15mm; the center positions of the screw holes 22 are not on the same vertical line, which means that the screw holes 22 of the two terminals are staggered in the height direction, and the vertical distance difference can be 3-10mm; the plug part 201 is the part of the terminal that is inserted into the mounting hole of the housing 1, and its cylindrical diameter is usually 3-8mm; the connecting part 202 is the part used for external cable connection, and its two terminal cross sections 21 can be parallel rectangular conductive surfaces; the boss 203 is a transition structure between the plug part 201 and the connecting part 202, and its height is usually 2-5mm; the stop surface 23 is the end face 14 of the boss 203 facing the plug part 201, which is used to limit the insertion depth; the abutment surface 24 is the end face 14 of the boss 203 facing the connecting part 202, which is used to contact and position with the inner wall of the housing 1;

[0043] The first and second terminals are fixed by inserting the plug portion 201 into the mounting hole of the housing 1. The stop surface 23 of the boss 203 contacts the end face 14 of the mounting hole to limit the insertion depth. A clamping space can be formed between the two terminal sections 21 of the connecting portion 202, and the external cable is pressed with a bolt through the screw hole 22. The abutment surface 24 of the boss 203 contacts the inner wall of the housing 1 to form support, ensuring that the terminal is subjected to uniform force. The longer design of the first terminal makes its connecting portion 202 lower, forming a staggered wiring space with the second terminal, which is convenient for connecting cables in different directions. The staggered arrangement of the screw holes 22 of the two terminals can avoid interference during tool operation.

[0044] The integral forming of the boss 203 between the plug-in part 201 and the connecting part 202 means that the three parts are processed from the same metal blank. The boss 203 serves as a structural transition area, ensuring both mechanical strength and positioning function. The connecting part 202 includes two terminal sections 21, meaning that the connecting part 202 has two opposing conductive planes. These two planes can be parallel to each other to form a clamping groove, or they can be bent to form a certain angle. The stop surface 23 is provided on the side of the boss 203 near the plug-in part 201, clearly defining the orientation of the stop surface 23 and ensuring that it can accurately abut against the inner wall of the outer shell 1 when inserted.

[0045] By setting terminals of different lengths and staggered screw holes 22, the wiring space conflict problem when multiple terminals are installed side by side is effectively solved; the boss 203 structure not only enhances the overall strength of the terminal, but also provides a precise installation positioning reference; the design of the two terminal cross sections 21 increases the contact area and improves the reliability of high current transmission; the cooperation of the stop surface 23 and the abutment surface 24 makes the terminal installation more stable and can effectively resist the mechanical stress during insertion and removal; compared with the solution of equal-length terminals, this differentiated design is more conducive to achieving high-density wiring in a compact layout.

[0046] Please see Figure 3 and Figure 4 It should be noted that the shape and size of the second mounting hole 42 are adapted to the shape and size of the terminal body 2 connecting part 202, and the second mounting hole 42 and the first mounting hole 13 are located on the same axis.

[0047] The inner wall of the first mounting hole 13 has an end face 14. After the connecting part 202 of the terminal body 2 is inserted into the first mounting hole 13, the abutting surface 24 fits against the end face 14 in the first mounting hole 13. The end face 14 is used to limit the insertion depth of the terminal body 2.

[0048] The second mounting hole 42 refers to a through hole provided on the cover plate 4. Its shape can be circular, square, or other polygonal. The hole diameter and the outer dimensions of the terminal body 2 connecting part 202 form a clearance fit or transition fit. The terminal body 2 connecting part 202 is the part where the terminal is inserted into the mounting hole. It is usually a cylindrical or prismatic conductive metal part, and the surface can be provided with anti-slip texture or chamfer. The first mounting hole 13 is a mounting hole on the outer shell 1. The inner wall end face 14 is an annular plane perpendicular to the hole axis and can be formed by machining. The abutment surface 24 is the positioning surface at the end of the terminal body 2 connecting part 202. It is usually a flat annular end face 14 and is perpendicular to the axis of the connecting part 202.

[0049] The terminal body 2 is positioned and installed by passing through the second mounting hole 42 and the first mounting hole 13 in sequence via the connecting part 202. The shape of the second mounting hole 42 restricts the circumferential rotation of the terminal. The terminal abutment surface 24 fits against the end face 14 of the first mounting hole 13 to form an axial limit. An interference fit can be used to ensure tight contact. The coaxial design of the first mounting hole 13 and the second mounting hole 42 ensures that the terminal is inserted in a straight line.

[0050] The second mounting hole 42 and the first mounting hole 13 are located on the same axis, specifically meaning that the center lines of the two holes coincide. In actual assembly, coaxial alignment can be achieved by guide pins or positioning steps. The end face 14 is used to limit the insertion depth of the terminal body 2. This means that when the contact surface 24 is completely in contact with the end face 14, the length of the exposed part of the terminal is precisely limited. This design is different from the traditional snap-fit ​​44 or threaded limiting method.

[0051] The coaxial double-hole mating structure enables precise positioning of the terminal. The end face 14 limiting design has higher position repeatability than the elastic buckle 44. The shape-adaptive second mounting hole 42 can effectively prevent the terminal from rotating and loosening, and improve the connection stability. The surface contact method between the abutment surface 24 and the end face 14 disperses the insertion and extraction stress, and is more resistant to mechanical wear than the point contact structure.

[0052] Please see Figure 1 and Figure 3 Specifically, the outer shell 1 has a first threaded hole 15 at each of the four corners near the cover plate 4, and the cover plate 4 has a second threaded hole 41 at the position corresponding to the first threaded hole 15. The outer shell 1 and the cover plate 4 are connected and fixed by screws through the first threaded hole 15 and the second threaded hole 41.

[0053] Both sides of the cover plate 4 are provided with buckles 44, and both sides of the outer shell 1 are provided with snap points 16 corresponding to the buckles 44. The outer shell 1 and the cover plate 4 can be connected by snapping together with the buckles 44 and snap points 16. The inner side of the cover plate 4 is provided with a pressing surface 43 that fits against the stop surface 23.

[0054] An electromagnetic lock 3 for locking during charging is installed on the outer casing 1, and a manual unlocking rope 31 for emergency unlocking is provided on the electromagnetic lock 3;

[0055] A temperature sensor 5 for detecting temperature is provided inside the cover plate 4 near the terminal body 2.

[0056] The first threaded hole 15 and the second threaded hole 41 refer to the internal threaded holes respectively provided on the outer shell 1 and the cover plate 4. They can adopt the standard thread specifications of M3-M6, and the hole depth is usually 5-10mm. The buckle 44 is an elastic snap-fit ​​structure on both sides of the cover plate 4. It can be made of plastic or metal and has an elastic deformation of 0.5-2mm. The snap point 16 is a protruding structure on the outer shell 1, which forms an interference fit with the buckle 44. The pressing surface 43 is a flat contact surface on the inner side of the cover plate 4, and the width is usually 3-8mm. The electromagnetic lock 3 is a device that generates magnetic force to lock after being energized, and the locking force can reach 50-200N. The manual unlocking rope 31 is a flexible pull rope connected to the electromagnetic lock 3, and the length is usually 10-30cm. The temperature sensor 5 can be an NTC thermistor or a digital sensor such as DS18B20, with a detection range of 0-120℃.

[0057] The outer shell 1 and the cover plate 4 are double-fixed by screws and buckles 44. The screws are first screwed into the first threaded hole 15 through the second threaded hole 41 for pre-tightening, and then the buckles 44 and the buckle 16 are elastically engaged to achieve secondary locking. The pressing surface 43 and the terminal stop surface 23 are tightly fitted to form pressure contact to ensure the terminal is stable. The electromagnetic lock 3 is fixed to the side of the outer shell 1 by bolts or slots, and its locking tongue extends out to lock the cover plate 4 when charging. One end of the manual unlocking rope 31 is fixed to the emergency mechanism of the electromagnetic lock 3, and the other end extends to the outside of the outer shell 1. The temperature sensor 5 is fixed to the inside of the cover plate 4 by thermally conductive adhesive or metal bracket, and its signal line passes through the reserved channel to connect to the control circuit.

[0058] The outer shell 1 and the cover plate 4 can be connected by snap fasteners 44 and snap points 16. This means that after the screws are tightened, the snap fasteners 44 will elastically deform and snap into the snap points 16 to form an anti-loosening structure. The inner side of the cover plate 4 is provided with a pressing surface 43 that fits against the stop surface 23. Specifically, the pressing surface 43 applies axial pressure to the terminals when the cover plate 4 is closed to prevent the terminals from loosening. The electromagnetic lock 3 is provided with a manual unlocking rope 31 for emergency unlocking. This means that in abnormal situations such as power failure, the electromagnetic lock 3 can be mechanically released by pulling the unlocking rope.

[0059] The dual fixing design of threaded connection and buckle 44 greatly improves the connection reliability between housing 1 and cover plate 4, making it particularly suitable for vibration environments; the addition of electromagnetic lock 3 effectively prevents it from being opened by human intervention during charging, and manual unlocking rope 31 ensures operability in emergency situations; the setting of temperature sensor 5 enables real-time monitoring of terminal working temperature and prevents overheating risks; the overall structure ensures safety while taking into account maintenance convenience, and has a higher protection level and service life compared to a single fixing method.

[0060] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A high current-carrying charging stand, characterized in that, include: The outer casing (1) has an AC socket (11) and a DC socket (12) on one side, and both the AC socket (11) and the DC socket (12) have a first mounting hole (13). Cover plate (4), the cover plate (4) is located on the side of the outer shell (1) away from the AC socket (11), and a second mounting hole (42) is provided through the cover plate (4). Terminal body (2), the terminal body (2) has multiple terminals, which are respectively inserted into the first mounting holes (13) on the AC socket (11) and DC socket (12) and pass through the second mounting holes (42) on the cover plate (4). The terminal body (2) has a terminal cross section (21), and the terminal cross section (21) exposed in the second mounting hole (42) has a screw hole (22) for connecting with external cables.

2. The high current-carrying charging socket according to claim 1, characterized in that: The terminal body (2) includes a first terminal (25) and a second terminal (26). The length of the first terminal (25) is greater than that of the second terminal (26). The center positions of the screw holes (22) on the first terminal (25) and the second terminal (26) are not on the same vertical line.

3. The high current-carrying charging stand according to claim 2, characterized in that: The first terminal (25) and the second terminal (26) both include a plug-in portion (201) and a connecting portion (202). A boss (203) is integrally formed between the plug-in portion (201) and the connecting portion (202). The plug-in portion (201) is a cylinder, and the connecting portion (202) includes two terminal cross sections (21).

4. The high current-carrying charging stand according to claim 3, characterized in that: The boss (203) includes a stop surface (23) and an abutment surface (24). The stop surface (23) is located on the side of the boss (203) near the insertion part (201), and the abutment surface (24) is located on the side of the boss (203) near the connecting part (202).

5. The high current-carrying charging socket according to claim 1, characterized in that: The shape and size of the second mounting hole (42) are adapted to the shape and size of the connecting part (202) of the terminal body (2), and the second mounting hole (42) and the first mounting hole (13) are located on the same axis.

6. The high-current charging stand according to claim 5, characterized in that: The inner wall of the first mounting hole (13) is provided with an end face (14). After the connecting part (202) of the terminal body (2) is inserted into the first mounting hole (13), the abutting surface (24) fits against the end face (14) in the first mounting hole (13). The end face (14) is used to limit the insertion depth of the terminal body (2).

7. The high-current charging stand according to claim 1, characterized in that: The outer shell (1) has a first threaded hole (15) at each of the four corners near the cover plate (4), and a second threaded hole (41) is provided on the cover plate (4) at the position corresponding to the first threaded hole (15). The outer shell (1) and the cover plate (4) are connected and fixed by screws through the first threaded hole (15) and the second threaded hole (41).

8. The high-current charging stand according to claim 7, characterized in that: Both sides of the cover plate (4) are provided with buckles (44), and both sides of the outer shell (1) are provided with buckle points (16) corresponding to the buckles (44). The outer shell (1) and the cover plate (4) can be connected by the buckles (44) and the buckle points (16). The inner side of the cover plate (4) is provided with a pressing surface (43) that fits against the stop surface (23).

9. The high-current charging stand according to claim 7, characterized in that: The outer casing (1) is equipped with an electromagnetic lock (3) for locking during charging, and the electromagnetic lock (3) is provided with a manual unlocking rope (31) for emergency unlocking.

10. The high-current charging stand according to claim 7, characterized in that: A temperature sensor (5) for detecting temperature is provided inside the cover plate (4) near the terminal body (2).

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