Manual maintenance switch

Abstract

The invention relates to a manual maintenance switch comprising a plug assembly comprising a high-voltage power pin terminal and a low-voltage interlocking hole terminal, and the high-voltage power pin terminal comprises a plugging part; the socket assembly comprises a high-voltage power hole terminal and a low-voltage interlocking pin terminal; the high-voltage power hole terminal comprises a power hole terminal base body and a shape spring, the power hole terminal base body is provided with a plug-in groove matched with the plug-in part, the shape spring is arranged on at least one side wall of the plug-in groove, and the shape spring is in contact conduction with the plug-in part to form a high-voltage loop; in the process of oppositely inserting the plug assembly and the socket assembly, the high-voltage power pin terminal is firstly contacted with the high-voltage power hole terminal, and the low-voltage interlocking hole terminal is then contacted with the low-voltage interlocking pin terminal; when the plug assembly and the socket assembly are pulled out, the low-voltage interlocking hole terminal and the low-voltage interlocking pin terminal are disconnected firstly, and the high-voltage power pin terminal and the high-voltage power hole terminal are disconnected later. The manual maintenance switch can be applied to special vehicles which are higher in servicing quality and need higher rated voltage and rated current.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to a manual maintenance switch. Background Art

[0002] With the rapid development of the new energy vehicle field, in order to make the car have better power (that is, it can accelerate faster in a short time), automobile manufacturers generally equip the car with a high-power power supply. The greater the power input or output of the power supply, the higher the voltage and current required. If relevant protective devices are not installed, it may cause safety accidents such as electric shock when the car is repaired.

[0003] The manual maintenance switch (MSD) provides a solution to the above problems. It can achieve electrical isolation of the high-voltage system. When a new energy electric vehicle is undergoing vehicle maintenance, it is only necessary to manually (without tools) pull out the maintenance switch to disconnect the power supply of the high-voltage system, and the high-voltage circuit can be easily disconnected to ensure the safety of people and vehicles.

[0004] However, the manual maintenance switches currently on the market are all used in household cars with relatively small curb weights. Their effective rated voltages are 500V to 1000V and their rated currents are 250A to 350A. They cannot be applied to special vehicles (such as heavy trucks and mining trucks) with higher curb weights that require higher rated voltages and larger rated currents. Summary of the invention

[0005] The purpose of the present invention is to provide a manual maintenance switch to solve the problem that the manual maintenance switches currently on the market are all used on family cars with relatively small curb weights, and cannot be applied to special vehicles (such as heavy trucks and mining trucks) with higher curb weights that require higher rated voltages and larger rated currents.

[0006] To achieve this object, the present invention adopts the following technical solutions: A manual maintenance switch, comprising: A plug assembly includes a high-voltage power pin terminal and a low-voltage interlocking hole terminal, wherein the high-voltage power pin terminal includes a plug-in portion; A socket assembly comprises a high-voltage power hole terminal and a low-voltage interlock pin terminal; the high-voltage power hole terminal comprises a power hole terminal base and a shape spring, the power hole terminal base is provided with a plug-in groove matching the plug-in portion, at least one side wall of the plug-in groove is provided with the shape spring, and the shape spring is in contact with the plug-in portion to form a high-voltage circuit; During the plug assembly and the socket assembly are plugged into each other, the high-voltage power pin terminal contacts the high-voltage power hole terminal first, and the low-voltage interlock hole terminal contacts the low-voltage interlock pin terminal later; During the process of pulling out the plug assembly and the socket assembly, the low-voltage interlocking hole terminal and the low-voltage interlocking pin terminal are disconnected first, and the high-voltage power pin terminal and the high-voltage power hole terminal are disconnected later.

[0007] Optionally, the plug assembly further comprises a plug housing, the plug housing comprising a plug outer shell portion and a plug inner shell portion arranged inside the plug outer shell portion; a plug anti-foolproof key groove is provided on at least one side wall of the plug outer shell portion; a gap is left between the outer wall of the plug inner shell portion and the inner wall of the plug outer shell portion, and a sealing ring groove is provided on the outer wall of the plug inner shell portion, and a plug sealing ring is provided in the sealing ring groove; The socket assembly also includes a socket shell, and a socket anti-foolproofing key position matching the plug anti-foolproofing key slot is provided on the side wall of the socket shell. The socket shell is embedded in the gap, and after the plug assembly and the socket assembly are plugged into each other, the inner wall of the socket shell is arranged outside the plug sealing ring and has an interference fit with the plug sealing ring.

[0008] Optionally, the high-voltage power pin terminal includes a connecting portion and two plug-in portions, the connecting portion and the two plug-in portions together constitute an integrally formed U-shaped structure; the inner shell of the plug is provided with a pin terminal groove, the connecting portion and part of the plug-in portion are embedded in the pin terminal groove; Two high-voltage power hole terminals are embedded in the socket housing, one of which is used to connect the positive pole, and the other is used to connect the negative pole.

[0009] Optionally, the plug assembly further comprises an interlocking hole terminal insulator disposed in the plug housing portion, the interlocking hole terminal insulator comprising an interlocking hole terminal insulator body portion and an interlocking hole terminal insulator extension portion formed integrally; Wherein, the insulating body of the interlocking hole terminal is arranged between the two plug-in parts and abuts against the connecting part, and the insulating body of the interlocking hole terminal is fixed to the inner shell part of the plug; The insulating body of the interlocking hole terminal is a porous structure, the middle of the insulating body of the interlocking hole terminal is provided with an interlocking hole terminal groove, and the low voltage interlocking hole terminal is embedded in the interlocking hole terminal groove; The insulating extension part of the interlocking hole terminal is provided with an avoidance hole for the insertion part to pass through, and the insulating extension part of the interlocking hole terminal abuts against the other end of the inner shell part of the plug to limit the plug sealing ring; The socket assembly further comprises an interlocking pin terminal insulator disposed in the socket housing, an interlocking pin terminal groove is provided in the middle of the interlocking pin terminal insulator, and the main body of the low voltage interlocking pin terminal is embedded in the interlocking pin terminal groove; After the plug assembly and the socket assembly are fully plugged into each other, the insulating body of the interlocking hole terminal abuts against the insulating body of the interlocking pin terminal.

[0010] Optionally, the plug assembly further comprises a locking handle rotatably connected to the plug housing portion, and a travel rail groove is provided on a side wall of the locking handle; A guide column matching the travel rail groove is provided on the side wall of the socket housing; during the process of plugging the plug assembly and the socket assembly together, the guide column is automatically guided into the travel rail groove; after the guide column is guided into the travel rail groove, the locking handle is used to drive the plug assembly and the socket assembly to be inserted to the bottom when being rotated.

[0011] Optionally, a shell hanging platform is provided on the outer wall of the plug shell part, and a handle hanging platform is provided on the locking handle. When the locking handle is rotated into place, the handle hanging platform is clamped with the shell hanging platform.

[0012] Optionally, there is a gap between the handle hanging platform and the plug shell portion, and the locking handle is slidably connected to a handle lock buckle, and the handle lock buckle is used to fill the gap.

[0013] Optionally, a resistor groove is provided in the socket housing at a position close to the high-voltage power hole terminal, and a thermistor is provided in the resistor groove.

[0014] Optionally, a sealing ring groove is formed at one end of the socket housing away from the plug housing, and a socket sealing ring is arranged in the sealing ring groove.

[0015] Optionally, the socket assembly further comprises an interlocking pin terminal insulator cover plate and a socket housing cover plate; The interlock pin terminal insulator cover plate and the interlock pin terminal insulator jointly fix the low voltage interlock pin terminal; The socket housing cover plate and the socket housing jointly fix the high-voltage power hole terminal; The socket housing is provided with a mounting hole, and a screw sleeve is arranged in the mounting hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The connection integrity of the high-voltage circuit (danger) is checked through the on-off signal of the low-voltage circuit (safety) to realize the high-voltage interlock (HVIL) function. Specifically, it has the following functions: ① Check the connection integrity of the high-voltage circuit before the vehicle is powered on. Only after the low-voltage circuit is detected to be conductive (the high-voltage circuit must be fully connected at this time), the system will power on the high-voltage circuit to avoid accidents caused by virtual connection; ② Detect the looseness of the high-voltage circuit (which will cause high-voltage power failure, vehicle power loss, and affect the safety of passengers, etc.), and provide alarm information to the vehicle controller before the high-voltage circuit is disconnected, so as to reserve time for the vehicle system to take countermeasures; ③ During the unplugging process, the low-voltage circuit is disconnected first. The system detects the disconnection of the low-voltage circuit and powers off the high-voltage circuit (before the high-voltage circuit is disconnected), which can avoid arcing caused by live unplugging, thereby affecting the service life of the manual maintenance switch or threatening the safety of maintenance personnel.

[0017] 2. The high-voltage power hole terminal of the present application adopts a method of opening a plug-in groove. Compared with the common punched and bent hole terminals on the market, it will not produce large tolerances due to the molding process and is not easy to deform. Therefore, the contact with the high-voltage power pin terminal is more uniform and stable, which can greatly reduce the heat problem caused by uneven contact; and it has more contact points, which greatly improves its current carrying capacity, so that it can meet the use scenario of rated current 600A.

[0018] 3. The high-voltage power hole terminal of the present application contacts the high-voltage power pin terminal through a spring. Compared with the hole terminal with a petal-shaped structure on the market, it has a longer service life for insertion, and the contact resistance between the terminals changes less after multiple plugging and unplugging.

[0019] 4. In addition, the high-voltage power hole terminal of the present application has a simple structure, is easy to form, and is easy to manufacture. Compared with the stamped terminals on the market, it can greatly reduce the problem of low delivery rate caused by dimensional tolerance and structural non-conformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of the manual maintenance switch in this embodiment; Figure 2 is an exploded view of the plug assembly in this embodiment; Figure 3 is a schematic diagram of the internal structure of the plug assembly in this embodiment; Figure 4 It is a schematic diagram of the structure of the plug housing, the interlocking hole terminal insulator, the low-voltage interlocking hole terminal and the locking handle in this embodiment; Figure 5 is an exploded view of the socket assembly in this embodiment; Figure 6 It is a schematic diagram of the structure of the socket housing in this embodiment; Figure 7 This is a schematic diagram of the structure of the high-voltage power hole terminal in this embodiment; Figure 8 Schematic diagram of the internal structure of the socket assembly in this embodiment (part 1); Fig. 9 Schematic diagram of the internal structure of the socket assembly in this embodiment (part 2); Fig.10 Schematic diagram of the internal structure of the socket assembly in this embodiment (part 3); Fig.11 This is a schematic diagram of the plug assembly and the socket assembly in the embodiment of the present invention in a plugged-in state; Fig.12 This is a schematic diagram of the process of the plug assembly and the socket assembly being plugged and locked together in this embodiment; Fig.13 This is a cross-sectional view of the plug assembly and the socket assembly after secondary locking in this embodiment.

[0023] Description of reference numerals: 10. Plug assembly; 11. Plug housing; 111. Plug shell; 1110. Plug anti-fool keyway; 1111. Shell hanging platform; 112. Plug inner shell; 113. Plug sealing ring; 12. High-voltage power pin terminal; 121. Connecting part; 122. Plug-in part; 13. Low-voltage interlocking hole terminal; 14. Interlocking hole terminal insulator; 141. Interlocking hole terminal insulator body; 142. Interlocking hole terminal insulator extension; 1420. Avoidance hole; 15. Locking handle; 150. Travel rail groove; 151. Handle hanging platform; 16. Handle lock buckle; 20. Plug assembly; 21. Socket housing; 211. Socket anti-foolproof key position; 212. Guide column; 213. Socket housing cover; 22. High-voltage power hole terminal; 221. Power hole terminal base; 222. Form spring; 23. Low-voltage interlocking pin terminal; 24. Interlocking pin terminal insulator; 241. Interlocking pin terminal insulator cover; 25. Thermistor; 26. Socket sealing ring; 27. Screw sleeve. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0027] Reference Figures 1 to 13 The manual maintenance switch disclosed in this embodiment includes: a plug assembly 10 and a socket assembly 20. The plug assembly 10 and the socket assembly 20 are plugged into place to form an electrical connector to form a normal current loop. When separated, the high-voltage loop is disconnected.

[0028] The plug assembly 10 includes a high voltage power pin terminal 12 and a low voltage interlocking hole terminal 13 , and the high voltage power pin terminal 12 includes a plug-in portion 122 ; The socket assembly 20 includes a high-voltage power hole terminal 22 and a low-voltage interlock pin terminal 23; the high-voltage power hole terminal 22 includes a power hole terminal base 221 and a spring 222, the power hole terminal base 221 is provided with a plug-in groove matching the plug-in portion 122, at least one side wall of the plug-in groove is provided with a spring 222, the spring 222 is in contact with the plug-in portion 122 to form a high-voltage circuit; During the insertion process of the plug assembly 10 and the socket assembly 20, the high-voltage power pin terminal 12 contacts the high-voltage power hole terminal 22 first, and the low-voltage interlocking hole terminal 13 contacts the low-voltage interlocking pin terminal 23 later; during the removal process of the plug assembly 10 and the socket assembly 20, the low-voltage interlocking hole terminal 13 and the low-voltage interlocking pin terminal 23 are disconnected first, and the high-voltage power pin terminal 12 and the high-voltage power hole terminal 22 are disconnected later, thereby realizing high-voltage interlocking (HVIL).

[0029] The high-voltage interlock (HVIL) function is realized by checking the connection integrity of the high-voltage circuit (danger) through the on-off signal of the low-voltage circuit (safety). Specifically, the following functions are provided: ① Check the connection integrity of the high-voltage circuit before the vehicle is powered on. Only after the low-voltage circuit is detected to be conductive (at this time, the high-voltage circuit must be fully connected), the system will power on the high-voltage circuit to avoid accidents caused by virtual connection; ② Detect the looseness of the high-voltage circuit (which will cause high-voltage power failure, vehicle power loss, and affect the safety of passengers, etc.), and provide alarm information to the vehicle controller before the high-voltage circuit is disconnected, so as to reserve time for the vehicle system to take countermeasures; ③ During the unplugging process, the low-voltage circuit is disconnected first. The system detects the disconnection of the low-voltage circuit and powers off the high-voltage circuit (before the high-voltage circuit is disconnected), which can avoid arcing caused by live unplugging, thereby affecting the service life of the manual maintenance switch or threatening the safety of maintenance personnel.

[0030] The high-voltage power hole terminal 22 of the present application adopts a method of opening a plug-in groove. Compared with the hole terminals commonly punched and bent on the market, it will not produce large tolerances due to the molding process and is not easy to deform. Therefore, the contact with the high-voltage power pin terminal 12 is more uniform and stable, which can greatly reduce the heat problem caused by uneven contact; and it has more contact points, which greatly improves its current carrying capacity, so that it can meet the use scenario of rated current 600A.

[0031] The high-voltage power hole terminal 22 of the present application contacts the high-voltage power pin terminal 12 through a spring 222. Compared with the hole terminal with a petal-shaped structure on the market, it has a longer service life, and the contact resistance between the terminals changes less after multiple plugging and unplugging.

[0032] In addition, the high-voltage power hole terminal 22 of the present application has a simple structure, is easy to form, and is easy to manufacture. Compared with the punched terminals on the market, it can greatly reduce the problem of low delivery rate caused by dimensional tolerance and structural non-conformity.

[0033] It should be noted that a spring is a special type of spring that usually has a specific shape or structure to suit specific application requirements. Figure 7 As shown, in the present embodiment, the spring 222 adopts a D-shaped structure. This design ensures that the spring 222 can be better embedded in the plug-in groove of the high-voltage power hole terminal 22, providing a larger contact area and a more stable elastic pressure when contacting the high-voltage power pin terminal 12, thereby improving the performance and safety of the entire connection system.

[0034] Reference Figures 2 to 6 The plug assembly 10 further comprises a plug housing 11, which plays the role of insulation protection and installation of various plug components. The plug housing 11 comprises a plug housing portion 111 and a plug inner housing portion 112 arranged inside the plug housing portion 111; a plug foolproof key groove 1110 is arranged on at least one side wall of the plug housing portion 111; a gap is left between the outer wall of the plug inner housing portion 112 and the inner wall of the plug housing portion 111, and a sealing ring groove is opened on the outer wall of the plug inner housing portion 112, and a plug sealing ring 113 is arranged in the sealing ring groove; an end of the plug inner housing portion 112 away from the socket assembly 20 is connected to the plug housing portion 111, and the plug inner housing portion 112 and the plug housing portion 111 are integrally formed; The socket assembly 20 also includes a socket shell 21, which serves as insulation protection and the installation of various socket components. The side wall of the socket shell 21 is provided with a socket anti-foolproofing key position 211 that matches the plug anti-foolproofing key slot 1110. The socket shell 21 is embedded in the gap, which improves the mechanical strength and stability during and after the plugging process, and ensures a reliable connection under high voltage and high current conditions; and after the plug assembly 10 and the socket assembly 20 are plugged into each other, the inner wall of the socket shell 21 is arranged outside the plug sealing ring 113, and has an interference fit with the plug sealing ring 113 to achieve dust and water resistance (GB / T4208-2017 IP68 level).

[0035] It should be noted that when the plug assembly 10 and the socket assembly 20 are plugged into each other, the high-voltage power pin terminal 12 and the high-voltage power hole terminal 22 come into contact first; when the plugging is continued, the plug sealing ring 113 and the inner wall of the socket housing 21 are interference fit, and finally the low-voltage interlocking hole terminal 13 and the low-voltage interlocking pin terminal 23 come into contact with each other; when unplugging, the process is reversed, thereby realizing high-voltage interlocking (HVIL).

[0036] Reference Figures 1 to 12The high-voltage power pin terminal 12 includes a connecting portion 121 and two plug-in portions 122, which together form an integrally formed U-shaped structure; the plug inner shell 112 is provided with a pin terminal groove, and the connecting portion 121 and part of the plug-in portion 122 are embedded in the pin terminal groove to fix the high-voltage power pin terminal 12; Two high-voltage power hole terminals 22 are embedded in the socket housing 21. The high-voltage power hole terminals 22 are fixed and limited by the hanging grooves on both sides of the socket housing 21. One of the high-voltage power hole terminals 22 is used to connect the positive pole, and the other high-voltage power hole terminal 22 is used to connect the negative pole.

[0037] Reference Figures 2 to 8 The plug assembly 10 further includes an interlocking hole terminal insulator 14 disposed in the plug housing portion 111 , the interlocking hole terminal insulator 14 including an integrally formed interlocking hole terminal insulator body portion 141 and an interlocking hole terminal insulator extension portion 142 ; The interlocking hole terminal insulating body 141 is arranged between the two plug-in parts 122 and abuts against the connecting part 121. The interlocking hole terminal insulating body 141 is fixed to the plug inner shell part 112 (the convex plate and the square hole) (through the groove and the hanging platform), that is, the high-voltage power pin terminal 12 is installed in the pin terminal groove of the plug inner shell part 112, and is limited and fixed by the plug inner shell part 112 and the interlocking hole terminal insulator 14. The interlocking hole terminal insulating body 141 is a porous structure, and an interlocking hole terminal groove is provided in the middle of the interlocking hole terminal insulating body 141. The low-voltage interlocking hole terminal 13 is embedded in the interlocking hole terminal groove, and the low-voltage interlocking hole terminal 13 is supported by its supporting petal on the step upper limit of the interlocking hole terminal groove and fixed; The interlocking hole terminal insulating extension portion 142 is provided with an avoidance hole 1420 for the plug portion 122 to pass through, and the interlocking hole terminal insulating extension portion 142 abuts against the other end of the plug inner shell portion 112 to limit the plug sealing ring 113; The socket assembly 20 also includes an interlocking pin terminal insulator 24 disposed in the socket housing 21. The interlocking pin terminal insulator 24 is fixed and limited by the hanging platforms on both sides of the interlocking pin terminal insulator 24 and the socket housing 21. An interlocking pin terminal groove is provided in the middle of the interlocking pin terminal insulator 24. The main body of the low-voltage interlocking pin terminal 23 is embedded in the interlocking pin terminal groove. The low-voltage interlocking pin terminal 23 is supported by its support flap on the step of the interlocking pin terminal groove and fixed in the upper limit position. After the plug assembly 10 and the socket assembly 20 are fully plugged into each other, the interlocking hole terminal insulating body 141 abuts against the interlocking pin terminal insulating body 24 .

[0038] Reference Figures 4 to 6 The plug assembly 10 further includes a locking handle 15 rotatably connected to the plug housing portion 111 , and a travel rail groove 150 is formed on the side wall of the locking handle 15 ; A guide column 212 matching the travel rail groove 150 is provided on the side wall of the socket housing 21; during the insertion of the plug assembly 10 and the socket assembly 20, the guide column 212 is automatically introduced into the travel rail groove 150; after the guide column 212 is introduced into the travel rail groove 150, the locking handle 15 is used to drive the plug assembly 10 and the socket assembly 20 to be inserted to the bottom when being rotated.

[0039] Further, see Figure 4 The outer wall of the plug housing 111 is provided with a housing hanging platform 1111, and the locking handle 15 is provided with a handle hanging platform 151. When the locking handle 15 is rotated into place, the handle hanging platform 151 is clamped with the housing hanging platform 1111.

[0040] Further, see Figure 3 to Figure 4 There is a gap between the handle hanging platform 151 and the plug housing 111, and the locking handle 15 is slidably connected with a handle lock 16, which is used to fill the gap. The locking handle 15 is provided with a cavity and a hanging platform, and the handle lock 16 is slidably connected to the locking handle 15 through the cavity and the hanging platform.

[0041] Reference Figures 11 to 13 During the plug-in process of the plug assembly 10 and the socket assembly 20, first align the plug's anti-foolproof key slot 1110 with the socket's anti-foolproof key position 211 and insert it until it cannot be inserted by hand. The guide column 212 on the side wall of the socket shell 21 will automatically guide it into the travel track groove 150 of the locking handle 15; then, by rotating the locking handle 15 until it cannot be rotated (the plug assembly 10 and the socket assembly 20 are fully plugged in), under the interaction of the guide column 212 and the travel track groove 150, the guide column 212 moves to the end of the travel track groove 150, and the handle hanging platform 151 on the locking handle 15 will hang on the shell hanging platform 1111 on the plug shell 11 (primary locking); finally, press the handle lock buckle 16 down to the bottom, so that the plug assembly 10 and the socket assembly 20 are fully plugged in and locked (secondary locking), and they can work and carry current normally.

[0042] Reference Fig.13When the plug assembly 10 and the socket assembly 20 are fully inserted into place, the handle hanging platform 151 of the locking handle 15 and the shell hanging platform 1111 on the plug housing 11 are hung on each other (this is the first locking); because there is a gap between the handle hanging platform 151 and the upper wall of the locking handle 15, in order to prevent other factors from pulling up the handle hanging platform 151, so that the lock between the handle hanging platform 151 and the shell hanging platform 1111 is released, resulting in poor contact between the plug assembly 10 and the socket assembly 20, the handle lock buckle 16 is needed to fill this gap; when the handle lock buckle 16 is pressed down to the bottom, the handle hanging platform 151 is completely restricted and cannot be unlocked, thereby realizing the function of secondary locking to prevent accidental unlocking; if you want to unlock, you must first pull up the handle lock buckle 16 completely to release the gap, and then you can pull up the handle hanging platform 151 to release the lock.

[0043] Reference Fig.10 A resistor groove is provided in the socket housing 21 near the high voltage power hole terminal 22, and a thermistor 25 is provided in the resistor groove. The thermistor 25 is fixed in the resistor groove by adhesive curing. When the temperature is too high, the temperature information is transmitted to the user to serve as a warning.

[0044] Reference Figure 8 A sealing ring groove is formed at one end of the socket housing 21 away from the plug housing 11, and a socket sealing ring 26 is arranged in the sealing ring groove. The socket sealing ring 26 has an interference fit with the customer's installation panel to play a role in dust and water prevention.

[0045] Reference Figure 5 The socket assembly 20 also includes an interlocking pin terminal insulator cover plate 241 and a socket shell cover plate 213; the interlocking pin terminal insulator cover plate 241 and the interlocking pin terminal insulator 24 jointly fix the low-voltage interlocking pin terminal 23; the socket shell cover plate 213 and the socket shell 21 jointly fix the high-voltage power hole terminal 22; a mounting hole is opened on the socket shell 21, and a screw sleeve 27 is provided in the mounting hole to prevent the socket shell 21 from being damaged by the torque of the mounting screw.

[0046] In summary, the present application provides a manual maintenance switch (MSD) electrical connector with a simple structure, low cost, high-voltage interlocking function, and a secondary locking structure. The connector is characterized by more terminal contact points, more uniform contact, better contact stability, and high voltage resistance of 7000V DC. It has been used for fast charging of batteries of new energy special vehicles (heavy trucks, mining trucks, etc.), meeting the application requirements of rated voltage of 1500V DC and rated current of 600A, and has a power of 900kW.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manual maintenance switch, characterized in that: include: A plug assembly (10) comprises a high-voltage power pin terminal (12) and a low-voltage interlocking hole terminal (13), wherein the high-voltage power pin terminal (12) comprises a plug-in portion (122); A socket assembly (20) comprises a high-voltage power hole terminal (22) and a low-voltage interlock pin terminal (23); the high-voltage power hole terminal (22) comprises a power hole terminal base (221) and a spring (222); the power hole terminal base (221) is provided with a plug-in groove matching the plug-in portion (122); at least one side wall of the plug-in groove is provided with the spring (222); the spring (222) is in contact with the plug-in portion (122) to form a high-voltage circuit; During the plug assembly (10) and the socket assembly (20) being plugged into each other, the high-voltage power pin terminal (12) contacts the high-voltage power hole terminal (22) first, and the low-voltage interlocking hole terminal (13) contacts the low-voltage interlocking pin terminal (23) later; During the process of pulling out the plug assembly (10) and the socket assembly (20), the low-voltage interlocking hole terminal (13) and the low-voltage interlocking pin terminal (23) are disconnected first, and the high-voltage power pin terminal (12) and the high-voltage power hole terminal (22) are disconnected later.

2. The manual maintenance switch according to claim 1, characterized in that: The plug assembly (10) further comprises a plug housing (11), the plug housing (11) comprising a plug outer shell portion (111) and a plug inner shell portion (112) arranged inside the plug outer shell portion (111); a plug foolproof key groove (1111) is provided on at least one side wall of the plug outer shell portion (111); a gap is left between the outer wall of the plug inner shell portion (112) and the inner wall of the plug outer shell portion (111), and a sealing ring groove is provided on the outer wall of the plug inner shell portion (112), and a plug sealing ring (113) is provided in the sealing ring groove; The socket assembly (20) further comprises a socket housing (21), the side wall of the socket housing (21) being provided with a socket foolproofing key position (211) matching the plug foolproofing key slot (1111), the socket housing (21) being embedded in the gap, and after the plug assembly (10) and the socket assembly (20) are plugged into each other, the inner wall of the socket housing (21) is arranged outside the plug sealing ring (113) and is interference fit with the plug sealing ring (113).

3. The manual maintenance switch according to claim 2, characterized in that: The high-voltage power pin terminal (12) comprises a connecting portion (121) and two plug-in portions (122), wherein the connecting portion (121) and the two plug-in portions (122) together form an integrally formed U-shaped structure; the plug inner shell (112) is provided with a pin terminal groove, and the connecting portion (121) and a portion of the plug-in portion (122) are embedded in the pin terminal groove; Two high-voltage power hole terminals (22) are embedded in the socket housing (21), wherein one of the high-voltage power hole terminals (22) is used to connect the positive pole, and the other of the high-voltage power hole terminals (22) is used to connect the negative pole.

4. The manual maintenance switch according to claim 3, characterized in that: The plug assembly (10) further comprises an interlocking hole terminal insulator (14) disposed in the plug housing portion (111), the interlocking hole terminal insulator (14) comprising an interlocking hole terminal insulation body portion (141) and an interlocking hole terminal insulation extension portion (142) formed integrally; The interlocking hole terminal insulating body part (141) is arranged between the two plug-in parts (122) and abuts against the connecting part (121), and the interlocking hole terminal insulating body part (141) is fixed to the plug inner shell part (112); The interlocking hole terminal insulating body (141) is a porous structure, an interlocking hole terminal groove is provided in the middle of the interlocking hole terminal insulating body (141), and the low-voltage interlocking hole terminal (13) is embedded in the interlocking hole terminal groove; The interlocking hole terminal insulating extension portion (142) is provided with an avoidance hole (1420) for the plug portion (122) to pass through, and the interlocking hole terminal insulating extension portion (142) abuts against the other end of the plug inner shell portion (112) to limit the plug sealing ring (113); The socket assembly (20) further comprises an interlocking pin terminal insulator (24) disposed in the socket housing (21), an interlocking pin terminal groove being provided in the middle of the interlocking pin terminal insulator (24), and a main body of the low-voltage interlocking pin terminal (23) being embedded in the interlocking pin terminal groove; After the plug assembly (10) and the socket assembly (20) are fully plugged into each other, the interlocking hole terminal insulating body (141) abuts against the interlocking pin terminal insulator (24).

5. The manual maintenance switch according to claim 2, characterized in that: The plug assembly (10) further comprises a locking handle (15) rotatably connected to the plug housing portion (111), and a travel rail groove (150) is formed on a side wall of the locking handle (15); A guide column (212) matching the travel track groove (150) is provided on the side wall of the socket housing (21); during the process of plugging the plug assembly (10) and the socket assembly (20), the guide column (212) is automatically guided into the travel track groove (150); after the guide column (212) is guided into the travel track groove (150), the locking handle (15) is used to drive the plug assembly (10) and the socket assembly (20) to be plugged into each other to the bottom when it is rotated.

6. The manual maintenance switch according to claim 5, characterized in that: The outer wall of the plug shell portion (111) is provided with a shell hanging platform (1111), and the locking handle (15) is provided with a handle hanging platform (151). When the locking handle (15) is rotated into place, the handle hanging platform (151) is clamped with the shell hanging platform (1111).

7. The manual maintenance switch according to claim 6, characterized in that: There is a gap between the handle hanging platform (151) and the plug housing portion (111), and the locking handle (15) is slidably connected to a handle lock buckle (16), and the handle lock buckle (16) is used to fill the gap.

8. The manual maintenance switch according to claim 2, characterized in that: A resistor groove is provided in the socket housing 21 at a position close to the high-voltage power hole terminal (22), and a thermistor (25) is provided in the resistor groove.

9. The manual maintenance switch according to claim 2, characterized in that: A sealing ring groove is formed at one end of the socket housing (21) away from the plug housing (11), and a socket sealing ring (26) is arranged in the sealing ring groove.

10. The manual maintenance switch according to claim 4, characterized in that: The socket assembly (20) further comprises an interlocking pin terminal insulator cover plate (241) and a socket housing cover plate (213); The interlocking pin terminal insulator cover plate (241) and the interlocking pin terminal insulator (24) jointly fix the low-voltage interlocking pin terminal (23); The socket housing cover plate (213) and the socket housing (21) jointly fix the high-voltage power hole terminal (22); The socket housing (21) is provided with a mounting hole, and a screw sleeve (27) is provided in the mounting hole.

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