An electric vehicle charging gun

Abstract

The application provides an electric vehicle charging gun, comprising: a PCB board in a ring structure, a plurality of groups of contact assemblies are arranged on the front surface of the PCB board at intervals, the contact assemblies are respectively a charging communication CAN-H, a charging communication CAN-L, an electrical connection confirmation CC1 and a charging connection confirmation CC2, and each of the contact assemblies comprises a conducting column. The positive and negative conducting columns of a low-voltage auxiliary power supply are both located in front of the PCB board. A positive coil is arranged in the ring-shaped interior of the PCB board. A grounding shaft is vertically arranged in the middle of the positive coil, and an insulating tube is arranged between the outer wall of the grounding shaft and the inner side of the positive coil, and the grounding shaft is made of a ferrous material. A negative coil is arranged on the outer side of the PCB board. The electric vehicle socket is provided with corresponding contact points corresponding to the conducting column, the positive coil, the grounding shaft and the negative coil, wherein the contact point matched with the grounding shaft is made of a magnet. The plug-in force can be reduced, the wear is greatly reduced, and the service life of the charging gun and the electric vehicle socket is effectively prolonged.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle charging technology, and particularly relates to an electric vehicle charging gun. Background Technology

[0002] With my country's economic development and continuous social progress, automobiles have become an indispensable means of transportation for modern people. Furthermore, due to the future trends of low-carbon and intelligent automobiles, the popularity of electric vehicles will continue to grow. Therefore, major automobile and parts manufacturers have conducted research and application of charging technologies such as conductive charging, wireless charging, and battery swapping for electric vehicles. Conductive charging primarily uses a charging gun to charge the vehicle. Currently, commonly used charging guns on the market, such as the AC charging gun disclosed in application number 201610907211.2 and the electric vehicle charging gun disclosed in application number 202010653524.6, both utilize the male connector at the front end of the charging gun to connect with the female connector on the vehicle to achieve charging. Since the national standard charging gun has 9 connectors, each representing a different power supply or control signal, the number of interconnected connectors and sockets is relatively large. To ensure the stability of the conduction, the fit between each connector and socket needs to be high, resulting in a large insertion and extraction force, which is inconvenient to use. Moreover, long-term use and wear will increase the gap between the connector and socket, affecting the conduction effect. Furthermore, the connector is prone to bending and deformation due to external force, making it impossible to connect properly with the socket. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an electric vehicle charging gun that significantly reduces insertion and extraction force, prevents connector bending, greatly reduces wear, and effectively extends the service life of the charging gun and the electric vehicle socket.

[0004] In order to achieve the objective of this invention, the following solution is proposed: An electric vehicle charging gun includes: a PCB board with a ring structure, and multiple sets of contact assemblies spaced apart on its front side. The contact assemblies are charging communication CAN-H, charging communication CAN-L, electrical connection confirmation CC1, and charging connection confirmation CC2. Each contact assembly includes a conductive post, and the front end face of each conductive post protrudes from the front end face of the PCB board by the same predetermined distance.

[0005] The conductive posts corresponding to the positive and negative low-voltage auxiliary power supplies are located at the front of the PCB board, and the front end face of the conductive post and the end face of the conductive post are on the same plane.

[0006] The positive coil is located inside the ring on the PCB board, and the front end of the positive coil protrudes from the front end of the PCB board by a predetermined distance.

[0007] The grounding shaft is vertically inserted through the middle of the positive coil, and there is an insulating tube between the outer wall of the grounding shaft and the inner side of the positive coil. The grounding shaft is made of iron-containing material.

[0008] The negative coil is located on the outside of the PCB board, and the front end of the negative coil protrudes from the front end of the PCB board by a predetermined distance.

[0009] The socket of the electric vehicle has corresponding contact points for the conductive post, positive coil, grounding shaft and negative coil. The contact point that matches the grounding shaft is made of magnet, and the end face of the contact point is adapted to the size of the front end face of the grounding shaft.

[0010] Furthermore, the contact assembly also includes a tube seat vertically disposed on the front side of the PCB board. The tube seat is made of insulating material, and the conductive post is coaxially disposed inside the tube seat and is movable along the axial direction.

[0011] Furthermore, both the positive and negative low-voltage auxiliary power supplies are provided with two conductive posts, and the two conductive posts of the positive and negative low-voltage auxiliary power supplies are respectively located at both ends of the top surface of a copper sheet. A terminal post is provided in the middle of the bottom surface of the copper sheet. The terminal post passes through the PCB board and is connected to the corresponding cable. An insulating layer is provided on the outer wall of the terminal post. There is a predetermined gap between the copper sheet and the PCB board.

[0012] Furthermore, the top surface of the copper sheet is covered with a plastic plate.

[0013] Furthermore, both the positive and negative coils have multiple contact pieces spaced apart on the inner circumference of the circular coil. There is an annular gap between the front end of the contact piece of the negative coil and the outer wall of the positive coil. There is a gap between the front end of the contact piece of the positive coil and the outer wall of the grounding shaft. The end of the contact piece facing the middle of the coil is tilted forward towards the charging gun. There is a gap between the contact piece of the positive coil and the end face of the insulating tube.

[0014] Furthermore, the front end face of the insulating tube has an annular groove.

[0015] Furthermore, the grounding shaft is moved along the axial direction.

[0016] Furthermore, a through-type lead screw motor is coaxially installed at the rear of the PCB board. The front end of the lead screw motor is connected to the end of the grounding shaft, and the end of the lead screw is connected to the grounding cable.

[0017] Furthermore, a connecting pipe is provided at the rear of the lead screw motor. The connecting pipe is made of insulating material and has a metal conduit inside. The end of the metal conduit is connected to a grounding cable, which passes through the end of the connecting pipe. The rear section of the lead screw passes through the metal conduit.

[0018] Furthermore, it also includes a tubular housing, with the PCB board located in the front section inside the housing. An insulating plate is embedded in the front end of the housing. The front end faces of the conductive posts, the front end faces of the conductive posts of the positive and negative low-voltage auxiliary power supplies, and the front end faces of the positive and negative coils all protrude from the front end face of the insulating plate. The front end faces of the conductive posts, the front end faces of the conductive posts of the positive and negative low-voltage auxiliary power supplies, and the front end faces of the positive and negative coils are all located inside the front end of the housing. The PCB board, the positive coil, the grounding shaft, the negative coil, and the cables connected to the positive and negative low-voltage auxiliary power supplies all extend from the rear end of the housing.

[0019] The beneficial effects of this invention are as follows: 1. By utilizing the attraction between magnets and iron-containing materials, the charging gun is connected to the socket on the electric vehicle, avoiding the use of a plug-in connection structure between connectors and sockets, thus greatly reducing the insertion and extraction force.

[0020] 2. Because the existence of shaft-type connectors is avoided, the phenomenon of connector bending is fundamentally avoided.

[0021] 3. The fitting connection at each joint greatly reduces wear and tear, effectively extending the service life of the charging gun and electric vehicle socket. Attached Figure Description

[0022] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of the invention.

[0023] Figure 1 A schematic diagram of the external structure of a preferred embodiment of this application is shown.

[0024] Figure 2 A schematic diagram of the PCB board structure is shown.

[0025] Figure 3 A side view of the internal structure of a preferred embodiment of this application is shown.

[0026] Figure 4 Another side view of the internal structure of a preferred embodiment of this application is shown.

[0027] Figure 5 An overall cross-sectional view of a preferred embodiment of this application is shown.

[0028] Figure 6 It shows Figure 5 A magnified view of a portion of point A in the middle.

[0029] Figure 7 It shows Figure 5 A magnified view of a section at point B.

[0030] The markings in the diagram are: PCB board-1, conductive post-11, tube socket-12, low-voltage auxiliary power supply positive-21, low-voltage auxiliary power supply negative-22, copper sheet-23, terminal block-231, plastic board-24, positive coil-3, contact piece-31, grounding shaft-4, insulating tube-41, lead screw motor-42, lead screw-421, connecting tube-43, metal conduit-44, negative coil-5, housing-6, insulating board-61. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0032] like Figures 1 to 5 As shown, an electric vehicle charging gun includes: The PCB board 1 has a ring structure, and multiple sets of contact assemblies are spaced apart on its front side. The contact assemblies are charging communication CAN-H, charging communication CAN-L, electrical connection confirmation CC1, and charging connection confirmation CC2. Each contact assembly includes a conductive post 11, and the front end face of the conductive post 11 protrudes from the front end face of the PCB board 1 by the same predetermined distance.

[0033] The conductive posts corresponding to the positive 21 and negative 22 of the low-voltage auxiliary power supply are located in front of the PCB board 1, and the front end face of the conductive post and the end face of the conductive post 11 are on the same plane.

[0034] The positive coil 3 is located inside the ring of the PCB board 1, and the front end face of the positive coil 3 protrudes from the front end face of the PCB board 1 by a predetermined distance.

[0035] The grounding shaft 4 is vertically inserted through the middle of the positive coil 3, and there is an insulating tube 41 between the outer wall of the grounding shaft 4 and the inner side of the positive coil 3. The grounding shaft 4 is made of iron-containing material.

[0036] The negative coil 5 is located on the outside of the PCB board 1. The front end of the negative coil 5 protrudes from the front end of the PCB board 1 by a predetermined distance. In this embodiment, the positive coil 3 is located in the middle of the PCB board 1. The purpose is to place the positive electrode at the center of the charging gun and the negative electrode at the edge of the charging gun, thereby improving the safety of use.

[0037] The electric vehicle's socket has corresponding contact points for the conductive post 11, positive coil 3, grounding shaft 4, and negative coil 5. The contact point matching the grounding shaft 4 is made of magnet, and the end face of the contact point is the same size as the front face of the grounding shaft 4 to ensure sufficient contact surface. This allows the charging gun to connect to the socket on the electric vehicle by utilizing the attraction between the magnet and the ferrous material, thus avoiding the plug-in connection between the connector and the socket and greatly reducing the insertion and extraction force. Furthermore, by avoiding the existence of shaft-type connectors, the bending of the connectors is fundamentally avoided. The fit-fit connection at each connection point greatly reduces wear and can effectively extend the service life of the charging gun and the electric vehicle socket. As another preferred embodiment, the grounding shaft 4 can also be designed as a magnet, and the contact point connecting the socket on the electric vehicle to the grounding shaft 4 can be made of ferrous material.

[0038] Preferred, such as Figure 2 As shown, the contact assembly also includes a tube seat 12 vertically disposed on the front side of the PCB board 1. The tube seat 12 is made of insulating material. The conductive post 11 is coaxially disposed inside the tube seat 12 and is movable along the axial direction. Specifically, a spring is provided between the bottom of the conductive post 11 and the bottom of the tube seat 12 to provide pressure to the conductive post 11 so that the conductive post 11 can better fit with the corresponding contact on the electric vehicle socket.

[0039] Preferred, such as Figure 2 As shown, both the positive and negative low-voltage auxiliary power supplies 21 and 22 are provided with two conductive posts. The two conductive posts of each of the positive and negative low-voltage auxiliary power supplies 21 and 22 are respectively located at both ends of the top surface of a copper sheet 23. Specifically, the copper sheet 23 is made of beryllium bronze. A terminal 231 is provided in the middle of the bottom surface of the copper sheet 23. The terminal 231 passes through the PCB board 1 and is connected to the corresponding cable. The outer wall of the terminal 231 is provided with an insulating layer. There is a predetermined gap between the copper sheet 23 and the PCB board 1. This structure can not only transmit current, but also utilize the metal elasticity of the copper sheet 23 itself to allow the conductive posts of the positive and negative low-voltage auxiliary power supplies 21 and 22 to move relative to the front of the PCB board 1, so as to better fit with the corresponding contacts of the electric vehicle socket. Furthermore, the elasticity of the copper sheet 23 makes the conductive posts more stably pressed against the corresponding socket contacts.

[0040] Further preferred, such as Figure 2 As shown, the top surface of the copper sheet 23 is covered with a plastic plate 24 to prevent the copper sheet 23 from being exposed and to ensure safety during use. The plastic plate 24 is elastic, which can further increase the elasticity and elastic recovery of the copper sheet 23 to ensure the long-term shape stability of the copper sheet 23 and prevent the copper sheet 23 from deforming.

[0041] Preferred, such as Figure 3 and Figure 6As shown, both the positive coil 3 and the negative coil 5 have multiple contact pieces 31 spaced apart on the inner circumference of the circular coil to increase the contact area and ensure the energizing effect. There is an annular gap between the front end of the contact piece 31 of the negative coil 5 and the outer wall of the positive coil 3. The contact assembly, the low-voltage auxiliary power supply positive 21, and the low-voltage auxiliary power supply negative 22 are all located within this gap area. There is a gap between the front end of the contact piece 31 of the positive coil 3 and the outer wall of the grounding shaft 4 to prevent the positive coil 3 from conducting with the grounding shaft 4. The end of the contact piece 31 facing the middle of the coil is tilted towards the front of the charging gun so that the outer surface of the contact piece 31 is inclined with the front of the PCB board 1. Furthermore, there is a gap between the contact piece 31 of the positive coil 3 and the end face of the insulating tube 41. Since the positive coil 3 and the negative coil 5 are usually made of a highly conductive metal, such as copper, the contact piece 31 itself has elasticity. This inclined structure allows the contact piece 31 to better fit with the contacts of the electric vehicle socket when the charging gun is connected, thanks to the elastic deformation of the contact piece 31. On the other hand, when in contact with the contacts of the electric vehicle socket, the contact piece 31 is compressed and undergoes a slight displacement, which serves to clean the contact surface. The gap between the contact pieces 31 also provides space for the elastic deformation of the contact piece 31.

[0042] Preferred, such as Figure 6 As shown, the front end face of the insulating tube 41 has an annular groove 411, which extends the distance between the insulating surfaces of the positive coil 3 and the grounding shaft 4 by utilizing the dimensions of the inner wall and bottom surface of the annular groove 411, thereby increasing the creepage distance between the positive coil 3 and the grounding shaft 4, preventing the two poles from conducting and improving the safety of use.

[0043] Preferably, the grounding shaft 4 is movable along the axial direction. When connecting the charging gun, the grounding shaft 4 can extend first to connect with the electric vehicle socket, and then the charging gun can be connected to the socket. This facilitates automatic connection between the charging gun and the electric vehicle socket. The grounding shaft 4 also enables quick pre-positioning, avoiding unnecessary friction between the front end face of the conducting post 11, the front end faces of the conducting posts of the low-voltage auxiliary power positive 21 and low-voltage auxiliary power negative 22, the front end faces of the positive coil 3 and negative coil 5, and the socket contacts of the electric vehicle. Furthermore, during separation, the grounding shaft 4 retracts actively, separating the grounding shaft 4 from the corresponding socket contacts, thus facilitating automatic separation of the charging gun.

[0044] Further preferred, such as Figure 5 , Figure 7 As shown, a through-type lead screw motor 42 is coaxially arranged at the rear of the PCB board 1. The front end of the lead screw 421 of the lead screw motor 42 is connected to the end of the grounding shaft 4, and the end of the lead screw 421 is connected to the grounding cable. The lead screw motor 42 controls the lead screw 421 to move along the axial direction, thereby causing the grounding shaft 4 to move along the axial direction.

[0045] Further preferred, such as Figure 7 As shown, a connecting pipe 43 is provided behind the lead screw motor 42. The connecting pipe 43 is made of insulating material and has a metal conduit 44 inside. The end of the metal conduit 44 is connected to a grounding cable. The grounding cable passes through the end of the connecting pipe 43. The rear section of the lead screw 421 passes through the metal conduit 44. Grounding is achieved through the contact between the outer wall of the lead screw 421 and the inner wall of the metal conduit 44. Furthermore, the grounding cable remains fixed in position as the lead screw 421 moves along the axis to avoid damage to the grounding cable due to long-term movement.

[0046] More specifically, such as Figure 1 As shown, the electric vehicle charging gun also includes a tubular housing 6. The PCB board 1 is located in the front section inside the housing 6. An insulating plate 61 is embedded in the front end of the housing 6. The front end face of the conductive post 11, the front end face of the conductive post of the low-voltage auxiliary power positive 21 and the low-voltage auxiliary power negative 22, and the front end face of the positive coil 3 and the negative coil 5 all protrude from the front end face of the insulating plate 61, thereby facilitating connection. The front end face of the conductive post 11, the front end face of the conductive post of the low-voltage auxiliary power positive 21 and the low-voltage auxiliary power negative 22, and the front end face of the positive coil 3 and the negative coil 5 are all located inside the front end of the housing 6, so that the housing 6 forms a protective structure to prevent bumps. The cables connected to the PCB board 1, the positive coil 3, the grounding shaft 4, the negative coil 5, the low-voltage auxiliary power positive 21, and the low-voltage auxiliary power negative 22 all extend from the rear end of the housing 6.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. An electric vehicle charging gun, characterized in that, include: The PCB board (1) has a ring structure and multiple sets of contact assemblies are spaced apart on its front side. The contact assemblies are charging communication CAN-H, charging communication CAN-L, electrical connection confirmation CC1, and charging connection confirmation CC2. Each contact assembly includes a conductive post (11), and the front end of the conductive post (11) protrudes from the front end of the PCB board (1) by the same predetermined distance. The conductive pillars corresponding to the positive (21) and negative (22) low-voltage auxiliary power supply are located in front of the PCB board (1), and the front end face of the conductive pillar and the end face of the conductive pillar (11) are on the same plane. The positive coil (3) is located inside the ring of the PCB board (1), and the front end face of the positive coil (3) protrudes from the front end face of the PCB board (1) by a predetermined distance. The grounding shaft (4) is vertically inserted through the middle of the positive coil (3), and there is an insulating tube (41) between the outer wall of the grounding shaft (4) and the inner side of the positive coil (3). The grounding shaft (4) is made of iron-containing material. The negative coil (5) is located on the outside of the PCB board (1), and the front end face of the negative coil (5) protrudes from the front end face of the PCB board (1) by a predetermined distance. The socket of the electric vehicle is equipped with corresponding contact points for the conductive post (11), positive coil (3), grounding shaft (4) and negative coil (5). The contact point that matches the grounding shaft (4) is made of magnet, and the end face of the contact point is adapted to the size of the front end face of the grounding shaft (4).

2. The electric vehicle charging gun according to claim 1, characterized in that, The contact assembly also includes a tube seat (12) vertically disposed on the front side of the PCB board (1). The tube seat (12) is made of insulating material, and the conductive post (11) is coaxially disposed inside the tube seat (12), and the conductive post (11) is movable along the axial direction.

3. The electric vehicle charging gun according to claim 1, characterized in that, Both the positive (21) and negative (22) low-voltage auxiliary power supply are provided with two conductive posts. The two conductive posts of the positive (21) and negative (22) low-voltage auxiliary power supply are respectively located at both ends of the top surface of a copper sheet (23). A terminal (231) is provided in the middle of the bottom surface of the copper sheet (23). The terminal (231) passes through the PCB board (1) and is connected to the corresponding cable. The outer wall of the terminal (231) is provided with an insulating layer. There is a predetermined gap between the copper sheet (23) and the PCB board (1).

4. The electric vehicle charging gun according to claim 3, characterized in that, The top surface of the copper sheet (23) is covered with a plastic plate (24).

5. The electric vehicle charging gun according to claim 1, characterized in that, Both the positive coil (3) and the negative coil (5) are provided with multiple contact pieces (31) spaced apart on the inner side of the circumference of the circular coil. There is an annular gap between the front end of the contact piece (31) of the negative coil (5) and the outer wall of the positive coil (3). There is a gap between the front end of the contact piece (31) of the positive coil (3) and the outer wall of the grounding shaft (4). The end of the contact piece (31) facing the middle of the coil is tilted towards the front of the charging gun. There is a gap between the contact piece (31) of the positive coil (3) and the end face of the insulating tube (41).

6. The electric vehicle charging gun according to claim 1, characterized in that, The front end face of the insulating tube (41) has an annular groove (411).

7. The electric vehicle charging gun according to claim 1, characterized in that, The grounding shaft (4) is moved along the axial direction.

8. The electric vehicle charging gun according to claim 7, characterized in that, A through-type lead screw motor (42) is coaxially arranged at the rear of the PCB board (1). The front end of the lead screw (421) of the lead screw motor (42) is connected to the end of the grounding shaft (4), and the end of the lead screw (421) is connected to the grounding cable.

9. An electric vehicle charging gun according to claim 8, characterized in that, A connecting pipe (43) is provided behind the lead screw motor (42). The connecting pipe (43) is made of insulating material. A metal conduit (44) is provided inside the connecting pipe (43). The end of the metal conduit (44) is connected to a grounding cable. The grounding cable passes through the end of the connecting pipe (43). The rear section of the lead screw (421) passes through the metal conduit (44).

10. An electric vehicle charging gun according to claim 1, characterized in that, It also includes a tubular housing (6), with a PCB board (1) located in the front section inside the housing (6). An insulating plate (61) is embedded in the front end of the housing (6). The front end face of the conductive post (11), the front end face of the conductive post of the low-voltage auxiliary power supply positive (21) and the low-voltage auxiliary power supply negative (22), and the front end face of the positive coil (3) and the negative coil (5) all protrude from the front end face of the insulating plate (61). The front end face of the conductive post (11), the front end face of the conductive post of the low-voltage auxiliary power supply positive (21) and the low-voltage auxiliary power supply negative (22), and the front end face of the positive coil (3) and the negative coil (5) are all located inside the front end of the housing (6). The cables connected to the PCB board (1), the positive coil (3), the grounding shaft (4), the negative coil (5), the low-voltage auxiliary power supply positive (21), and the low-voltage auxiliary power supply negative (22) all extend from the rear end of the housing (6).

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