CN110289519B

CN110289519B - Direct current charging socket for pure electric vehicle

Info

Publication number: CN110289519B
Application number: CN201910554220.1A
Authority: CN
Inventors: 薛旭飞; 马利丹; 曾羽飞; 王飞; 姚意; 汪涛; 李东; 贾海亮
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2021-01-05
Anticipated expiration: 2039-06-25
Also published as: CN110289519A

Abstract

The invention relates to a direct current charging socket for a pure electric vehicle, which is characterized in that a national standard charging interface, a whole vehicle high-voltage interface and a whole vehicle low-voltage signal interface are arranged on the direct current charging socket; the direct current charging socket comprises a socket body, one end of the socket body is hermetically connected with the national standard charging interface, and the other end of the socket body is hermetically connected with a rear cover; an integrated circuit board is arranged in the socket body, a low-voltage terminal is fixedly arranged on the integrated circuit board, and a low-voltage signal plug-in is connected with a circuit on the integrated circuit board and extends out of the side wall of the socket body to form the whole vehicle low-voltage signal interface; high-voltage terminal one end is fixed in the high-voltage terminal mounting hole on the national standard charging interface, the other end passes integrated circuit board is connected with the high-voltage copper bar, the socket body is close to be provided with the high-voltage pencil access & exit on one side lateral wall of high-voltage terminal in order to form whole car high-voltage interface, whole car high-voltage interface is provided with the tail cover of sealing a thread.

Description

Direct current charging socket for pure electric vehicle

Technical Field

The invention belongs to the technical field of electric vehicle charging, and particularly relates to a direct-current charging socket for a pure electric vehicle.

Background

Charging is a necessary function of the pure electric vehicle. With the improvement of the requirement of people on the charging time of the pure electric vehicle, the direct-current charging socket is used more frequently, so that the direct-current charging socket is an essential component in the pure electric vehicle. Because pure electric vehicles direct current charging socket belongs to the high-voltage electric ware of car level, considers human-machine engineering simultaneously, pure electric vehicles direct current charging socket generally installs in the front grille of vehicle, rear side wall etc. the position in order to make things convenient for people's use, but these places are general the space narrow and small, lead to the design of vehicle, integrated, assembly difficult. Therefore, the direct-current charging socket not only needs to have higher protection performance, but also needs to have better space integration of the whole vehicle and better assembly of the whole vehicle. Therefore, according to the requirements of the pure electric vehicle on the whole performance and the space arrangement, the assembly and the regulations, the direct-current charging socket with a reasonable structure is designed, and the charging requirement of the pure electric vehicle is ensured to be imperative. Particularly, in consideration of the use environment of the vehicle and the high-voltage safety of the whole vehicle, the fast charging socket is required to have higher protection requirements on dust prevention, water prevention and the like. Meanwhile, the pure electric automobile direct-current charging socket needs to meet the requirements of small and exquisite appearance, convenience in installation, suitability for space arrangement and assembly of the whole automobile and enough protection performance so as to guarantee charging performance of the whole automobile and high-voltage safety of the whole automobile.

Disclosure of Invention

The invention designs a direct-current charging socket for a pure electric vehicle, which has the advantages of better high-voltage safety performance of the whole vehicle, space integration performance of the whole vehicle, better waterproof and dustproof capacity, convenience in assembly, small appearance, suitability for space arrangement of the whole vehicle and easiness in assembly on the premise of meeting the charging function of the whole vehicle.

In order to achieve the purpose, the invention adopts the following technical scheme:

a direct current charging socket for a pure electric vehicle is provided with a national standard charging interface, a whole vehicle high-voltage interface and a whole vehicle low-voltage signal interface;

the direct current charging socket comprises a socket body, one end of the socket body is hermetically connected with the national standard charging interface, and the other end of the socket body is hermetically connected with a rear cover; an integrated circuit board is arranged in the socket body, a low-voltage terminal is fixedly arranged on the integrated circuit board, and a low-voltage signal plug-in is connected with a circuit on the integrated circuit board and extends out of the side wall of the socket body to form the whole vehicle low-voltage signal interface; high-voltage terminal one end is fixed in the high-voltage terminal mounting hole on the national standard charging interface, the other end passes integrated circuit board is connected with the high-voltage copper bar, the socket body is close to be provided with the high-voltage pencil access & exit on one side lateral wall of high-voltage terminal in order to form whole car high-voltage interface, whole car high-voltage interface is provided with the tail cover of sealing a thread.

Further, an inner isolation plate is arranged between the rear cover and the socket body to isolate a high-voltage loop and a low-voltage loop inside the direct-current charging socket; the high-voltage copper bar is arranged between the rear cover and the inner isolation plate.

Furthermore, a high-voltage terminal through hole II, a high-voltage wire shielding layer connecting through hole and a mounting fixing hole are formed in the inner isolation plate; the inner isolation plate is fixed on the socket body through the mounting and fixing hole.

Furthermore, an isolation structure and a sealing groove are arranged on the rear cover, and a radial multistage sealing ring is arranged in the sealing groove; and the periphery of the rear cover is also provided with a clamping structure II to be connected with the socket body in a clamping manner.

Further, the high-voltage copper bar comprises a PE copper bar, a DC + copper bar and a DC-copper bar; and the high-voltage copper bar is welded with the corresponding high-voltage wire and then is arranged in the direct-current charging socket to be connected with the corresponding high-voltage terminal bolt.

Further, the national standard charging interface comprises an installation flange, the charging interface positioned in the front of the installation flange is consistent with the national standard, and a boss positioned at the rear of the installation flange is provided with a low-voltage terminal installation hole, a high-voltage terminal installation hole and an installation positioning screw hole; the side surface of the boss is also provided with a clamping structure I so as to be clamped and connected with the socket body; the boss and the socket body are sealed by adopting a multi-stage radial sealing structure.

Further, the national standard interface that charges is inside to be equipped with the waterproof performance after the rifle is inserted in order to ensure with rifle complex seal structure that charges, and this seal structure adopts multistage radial seal structure.

Furthermore, the socket body is a shell structure with openings at the upper end and the lower end; the side wall of the high-voltage wiring harness inlet and outlet is provided with a high-voltage wiring harness inlet and outlet and a low-voltage signal plug-in mounting port, and the side wall of the high-voltage wiring harness inlet and outlet is also provided with a side clamping structure to be connected with the wire sealing tail cover; the side walls of the upper end and the lower end of the socket body are respectively provided with an upper clamping structure and a lower clamping structure so as to be respectively connected with the rear cover and the national standard charging interface; the socket is characterized in that a circuit board mounting plate is arranged inside the socket body, and fixing screw holes are formed in the circuit board mounting plate and matched with mounting and positioning screw holes in the national standard charging interface and fixing holes in the integrated circuit board.

Furthermore, the low-voltage signal plug-in is installed from the inside of the socket body to the outside, and a sealing gasket is arranged between the low-voltage signal plug-in and the mounting port of the low-voltage signal plug-in and fixedly connected by adopting an external tightening bolt.

Furthermore, the integrated circuit board comprises a PCB and a high-voltage wire shielding layer connecting interface; on the PCB, a grounding point is connected to a PE point of the PCB from a PE shielding layer connecting point and is connected with a DC-shielding layer connecting point and a DC + shielding layer connecting point; a 1000 omega resistor is connected between the PE point and the CC 1; the low-voltage signal plug-in is connected with the printed circuit on the PCB board through a flat cable socket; temperature sensors RT1, RT2 are soldered on the PCB board and connected to the low voltage signal plug by printed circuit.

Further, the wire sealing tail cover comprises a wire sealing tail cover body, the wire sealing tail cover body and the socket body are sealed through a sealing tail plate and a wire sealing body, a wire sealing body positioning structure is arranged on the sealing tail plate, and a high-voltage wire through hole is formed in the wire sealing body; the wire sealing tail cover body is further provided with a clamping structure matched with the side clamping structure on the side wall of the high-voltage wire harness inlet and outlet.

Further, the socket body, the rear cover, the national standard charging interface and the inner partition plate are respectively formed through dies, and the materials of the socket body, the rear cover, the national standard charging interface and the inner partition plate are all 20% glass fiber reinforced PA 6.

This pure electric vehicles is with direct current socket that charges has following beneficial effect:

(1) according to the invention, the integrated circuit board is used, so that the production process is simplified, the internal space is optimized, the internal insulation performance of the direct current charging socket is more reliable, the assembly of the direct current charging socket is simpler and quicker, the direct current charging socket is small in appearance, and the direct current charging socket is suitable for space arrangement of a whole vehicle and easy assembly.

(2) The invention mainly adopts 5 sealing structures, namely the internal part of a national standard charging interface, the part between the national standard charging interface and a socket body, the part between the socket body and a rear cover, the part between the socket body and a low-voltage signal plug-in and the part between the socket body and a sealing tail cover. The inside seal structure that is equipped with socket and rifle that charges of interface has ensured the waterproof performance behind the rifle of inserting. A sealing structure is designed between the charging interface and the socket body, and the required sealing effect is achieved by adopting radial multi-stage sealing; a sealing structure is arranged between the socket body and the rear cover, and radial multistage sealing achieves the required sealing effect; the end face sealing is adopted between the socket body and the low-voltage signal plug-in unit, and the sealing rubber pad is compressed by screwing a bolt to achieve the required sealing effect; the socket body and the sealing tail cover are sealed through the sealing tail plate and the wire sealing body, and sealing between the high-voltage wire and the socket is achieved. Through above 5 sealings for the charging socket is whole, has the ability of reaching waterproof grade IP67 in the design.

(3) According to the invention, the arrangement of the inner isolation plate and the isolation structure on the rear cover completely isolates the high-low voltage loop in the socket, so that the reliability and the independence of the circuit in the socket are improved.

(4) The main body part of the invention is made of 20% glass fiber reinforced PA6 plastic insulating material, the forming mode is simple, and the cost is lower after mass production.

(5) In the invention, the charging interface belongs to a national standard interface, and the interface and the appearance are strictly designed according to the national standard; the socket body adopts integrated into one piece, and there are two kinds with the connected mode of other parts, and bolted connection is connected with joint structure, convenient assembling.

Drawings

FIG. 1: the structure schematic diagram of the direct-current charging socket for the pure electric vehicle in the embodiment of the invention;

FIG. 2: the explosion diagram of the direct current charging socket for the pure electric vehicle in the embodiment of the invention;

FIG. 3: the structure schematic diagram of the China sign charging interface in the embodiment of the invention;

FIG. 4: the structure schematic diagram of the socket body in the embodiment of the invention;

FIG. 5: the structure schematic diagram of the integrated circuit board in the embodiment of the invention;

FIG. 6: a schematic diagram of a printed circuit in an embodiment of the invention;

FIG. 7: the structure schematic diagram of the high-voltage copper bar in the embodiment of the invention;

FIG. 8: the structure schematic diagram (front side) of the inner isolation plate in the embodiment of the invention;

FIG. 9: the structure of the inner isolation plate in the embodiment of the invention is schematically shown (the reverse side);

FIG. 10: the structure of the rear cover in the embodiment of the invention is shown schematically;

FIG. 11: the installation and sealing structure of the wire sealing tail cover in the embodiment of the invention is schematically shown.

Description of reference numerals:

1-national standard charging interface; 11-mounting flange; 12-clamping structure I; 13-low voltage terminal mounting holes; 14-high voltage terminal mounting holes; 15-installing a positioning screw hole; 2, a high-voltage interface of the whole vehicle; 21-high voltage terminal; 3, a low-voltage signal interface of the whole vehicle; 31-low voltage signal plug-in; 32-low voltage terminal; 4-a socket body; 41-lower clamping structure; 42-upper clamping structure; 43-high voltage harness access; 44-side clamping structure; 45-low voltage signal plug-in mounting port; 46-a circuit board mounting plate; 5-an integrated circuit board; 51-a fixing hole; 52-high voltage terminal via I; 53-PCB board; 531-bus cable socket; 532-PE shielding layer connection point; 533-DC-shield layer access point; 534-DC + shield layer access point; 535-resistance; 54-high-voltage line shielding layer connection interface; 6-high voltage copper bar; 61-DC-copper bar; 62-DC + copper bar; 63-PE copper bar; 7-inner separating plate; 71-high voltage terminal via hole ii; 72-connecting the high-voltage wire shielding layer with the through hole; 73, mounting a fixing hole; 8, a rear cover; 81-clamping structure II; 82-an isolation structure; 83-a seal groove; 9-sealing the tail cover; 91-sealing the tail cover body; 92, a wire sealing body; 921 — high voltage line via hole; 93-sealing tail plate; 931-a wire sealing body positioning structure; 10-sealing ring.

Detailed Description

The invention will be further explained with reference to the accompanying drawings:

fig. 1 to 11 show a dc charging socket for a pure electric vehicle according to an embodiment of the present invention. Fig. 1 and fig. 2 are schematic structural diagrams of a dc charging socket for a pure electric vehicle in the present embodiment; fig. 3 is a schematic structural diagram of the china mark charging interface according to the embodiment; fig. 4 is a schematic structural view of the socket body in the present embodiment; fig. 5 and 6 are schematic structural views of the integrated circuit board in the present embodiment; fig. 7 is a schematic structural view of a high-voltage copper bar in the present embodiment; fig. 8 and 9 are schematic structural views of the inner partition plate in the present embodiment; fig. 10 is a schematic structural view of the rear cover in the present embodiment; fig. 11 is a schematic view of the mounting and sealing structure of the closing tail cap in the present embodiment.

As shown in fig. 1 and fig. 2, in the dc charging socket for the pure electric vehicle in the present embodiment, a national standard charging interface 1, a complete vehicle high voltage interface 2, and a complete vehicle low voltage signal interface 3 are arranged on the dc charging socket; the direct-current charging socket comprises a socket body 4, one end of the socket body 4 is connected with the national standard charging interface 1 in a sealing mode, and the other end of the socket body 4 is connected with a rear cover 8 in a sealing mode; an integrated circuit board 5 is arranged in the socket body 4, a low-voltage terminal 32 is fixedly arranged on the integrated circuit board 5, and a low-voltage signal plug-in 31 is connected with a circuit on the integrated circuit board 5 and extends out of the side wall of the socket body 4 to form a whole vehicle low-voltage signal interface 3; one end of the high-voltage terminal 21 is fixed in a high-voltage terminal mounting hole 14 on the national standard charging interface 1, the other end of the high-voltage terminal passes through the integrated circuit board 5 to be connected with the high-voltage copper bar 6, a high-voltage wiring harness inlet and outlet 43 is arranged on the side wall, close to the high-voltage terminal 21, of the socket body 4 to form a whole vehicle high-voltage interface 2, and a wire sealing tail cover 9 is arranged at the position of the whole vehicle high.

Preferably, an inner isolation plate 7 is further arranged between the rear cover 8 and the socket body 4 to isolate high and low voltage loops inside the direct current charging socket; the high-voltage copper bar 6 is arranged between the rear cover 8 and the inner partition plate 7, as shown in fig. 2.

Preferably, the inner isolation plate 7 is provided with a high-voltage terminal via hole ii 71, a high-voltage wire shielding layer connecting via hole 72 and a mounting fixing hole 73; the inner partition 7 is fixed to the socket body 4 through the mounting hole 73, as shown in fig. 2, 8, and 9. In this embodiment, the periphery of the inner isolation plate 7 is further provided with a vertical plate to achieve a better isolation effect.

In this embodiment, the inner isolation plate 7 is integrally formed, and is installed on the socket body 4 through structural design to be matched with the rear cover 8, so that the high-low voltage loop inside the socket is completely isolated, and the reliability and the independence of the circuit inside the socket are improved. The inner isolation plate 7 and the integrated circuit board 5 are fixed on the socket body 4 through three screw holes, and the high-voltage terminal 21 is fixed inside the socket through the structural design of the high-voltage terminal via hole, so that the whole structure is more reliable.

Preferably, the rear cover 8 is provided with an isolation structure 82 and a sealing groove 83, and a multi-stage radial sealing ring 10 is arranged in the sealing groove 83; the periphery of the rear cover 8 is further provided with a clamping structure ii 81 for clamping connection with the socket body 4, as shown in fig. 10. In this embodiment, the isolation structure 82 is a partition board to isolate the high-voltage copper bars. The rear cover 8 is integrally formed, and the isolation structure 82, the clamping structure and the sealing structure are structurally designed, so that the problems of assembly, high-low voltage isolation, water resistance and the like of the socket are solved. The isolation structure completely isolates the high-voltage circuit and the low-voltage circuit by matching with the inner isolation plate 7 and the socket body 4, so that the whole system is more reliable. The sealing groove is internally provided with a radial multistage sealing ring, so that the tail part has better waterproof performance.

In the embodiment, the high-voltage copper bar 6 comprises three copper bars, namely a PE copper bar 63, a DC + copper bar 62 and a DC-copper bar 61; the high-voltage copper bar 6 is welded with the corresponding high-voltage wire and then is installed into the direct-current charging socket to be connected with the corresponding high-voltage terminal 21 through a bolt, as shown in fig. 2 and 7. In this embodiment, the high-voltage copper bar 6 is integrally formed by stamping.

Preferably, the national standard charging interface 1 comprises an installation flange 11, the charging interface positioned at the front part of the installation flange 11 is consistent with the national standard, and a boss positioned at the rear part of the installation flange 11 is provided with a low-voltage terminal installation hole 13, a high-voltage terminal installation hole 14 and an installation positioning screw hole 15; the side surface of the boss is also provided with a clamping structure I12 to be connected with the socket body 4 in a clamping way; the boss and the socket body 4 are sealed by a multi-stage radial sealing structure, as shown in fig. 2 and 3. In this embodiment, national standard interface 1 that charges adopts integrated into one piece, and low voltage terminal mounting hole 13, high voltage terminal mounting hole 14 are the counter bore, make things convenient for the location and the installation of terminal, and the one end of low voltage terminal 32 is inserted in low voltage terminal mounting hole 13 with the location. Adopt installation joint structure for charging socket's assembly is more swift convenient.

Preferably, the national standard interface 1 that charges is equipped with inside with the waterproof performance after the rifle is inserted in order to ensure with rifle complex seal structure that charges of the interface, and this seal structure adopts multistage radial seal structure.

Preferably, the socket body 4 is a shell structure with openings at the upper end and the lower end; a high-voltage wiring harness inlet and outlet 43 and a low-voltage signal plug-in mounting port 45 are formed in the side wall of the socket body 4, and a side clamping structure 44 is further arranged on the side wall of the high-voltage wiring harness inlet and outlet 43 to be connected with the wire sealing tail cover 9; the upper clamping structure 42 and the lower clamping structure 41 are respectively arranged on the side walls of the upper end and the lower end of the socket body 4 so as to be respectively connected with the rear cover 8 and the national standard charging interface 1; the inside of socket body 4 is provided with circuit board mounting panel 46, is provided with the fixed screw on circuit board mounting panel 46 in order to cooperate with installation positioning screw 15 on national standard charging interface 1, fixed orifices 51 on integrated circuit board 5, as shown in fig. 2 and 4.

In this embodiment, the low voltage signal plug 31 is installed from the inside of the socket body 4 to the outside, and a sealing gasket is provided between the low voltage signal plug 31 and the low voltage signal plug installation opening 45 and is fixedly connected by an external tightening bolt.

In the present embodiment, the high-pressure harness inlet/outlet 43 is divided into a plurality of harness passages by partitions, as shown in fig. 2 and 4.

Preferably, the integrated circuit board 5 comprises a PCB board 53 and a high voltage wire shield layer connection interface 54; on the PCB 53, the grounding point is connected to the PE point of the PCB 53 from the PE shield connection point 532, and connects the PE point with the DC-shield layer connection point 533 and the DC + shield layer connection point 534; a 1000 omega resistor 535 is connected between the PE point and the CC 1; the low-voltage signal plug-in 31 is connected with a printed circuit on the PCB 53 through a flat cable socket 531; the temperature sensors RT1, RT2 are soldered to the PCB board 53 and connected to the low voltage signal package 31 by printed circuitry, as shown in fig. 5 and 6.

In this embodiment, the integrated circuit board 5 is composed of a PCB 53 and a high-voltage wire shielding layer connection interface 54 (single-wire socket interface) and connects the low-voltage terminal 32 and the low-voltage signal plug-in 32. Relevant electrical components are welded on the PCB 53, and interfaces on the PCB 53 are connected with the relevant components through printed circuits. The high-voltage wire shielding layer is connected with the interface 54, and the fast-charging high-voltage wire shielding layer is connected through the inserted single-core low-voltage wire (the low-voltage wire and the high-voltage wire shielding layer are connected through welding). The low-voltage terminal 32 is fixedly mounted on the PCB board 53 by soldering. The low voltage signal plug 31 is connected to the circuit of the PCB board 53 through the low voltage bus bar receptacle 531. The integrated circuit board is used, the production process is simplified, the internal space is optimized, the internal insulation performance of the direct-current charging socket is more reliable, and the direct-current charging socket is simpler and quicker to assemble.

Preferably, the wire sealing tail cover 9 comprises a wire sealing tail cover body 91, the wire sealing tail cover body 91 and the socket body 4 are sealed through a sealing tail plate 93 and a wire sealing body 92, a wire sealing body positioning structure 931 is arranged on the sealing tail plate 93, and a high-voltage wire through hole 921 is arranged on the wire sealing body 92; the wire sealing tail cover body 91 is further provided with a clamping structure which is matched with the side clamping structure 44 on the side wall of the high-voltage wire harness inlet 43, as shown in fig. 2 and 11. The sealing tail cover body 1, the wire sealing tail plate 93 and the rubber wire sealing body 92 jointly form an installation and sealing structure of the high-voltage wire outlet position of the charging socket. The sealing tail plate 93 is provided with a wire sealing body positioning structure 931, so that the position of the wire sealing body is ensured to be correct, the wire sealing body is not easy to deform, and the tail waterproof reliability is improved. The sealing tail cap body 91 is integrally formed.

In this embodiment, the wire sealing body positioning structure 931 is a cross-shaped rib, and is matched with the corresponding groove on the wire sealing body 92 for positioning, as shown in fig. 11.

In this embodiment, the socket body 4, the rear cover 8, the national standard charging interface 1, the inner isolation plate 7 and the wire sealing tail cover body 91 are respectively formed by a mold, and the materials of the inner isolation plate and the wire sealing tail cover body are all 20% glass fiber reinforced PA 6.

According to the invention, the integrated circuit board is used, so that the production process is simplified, the internal space is optimized, the internal insulation performance of the direct current charging socket is more reliable, the assembly of the direct current charging socket is simpler and quicker, the direct current charging socket is small in appearance, and the direct current charging socket is suitable for space arrangement of a whole vehicle and easy assembly.

The invention mainly adopts 5 sealing structures, namely the internal part of a national standard charging interface, the part between the national standard charging interface and a socket body, the part between the socket body and a rear cover, the part between the socket body and a low-voltage signal plug-in and the part between the socket body and a sealing tail cover. The inside seal structure that is equipped with socket and rifle that charges of interface has ensured the waterproof performance behind the rifle of inserting. A sealing structure is designed between the charging interface and the socket body, and the required sealing effect is achieved by adopting radial multi-stage sealing; a sealing structure is arranged between the socket body and the rear cover, and radial multistage sealing achieves the required sealing effect; the end face sealing is adopted between the socket body and the low-voltage signal plug-in unit, and the sealing rubber pad is compressed by screwing a bolt to achieve the required sealing effect; the socket body and the sealing tail cover are sealed through the sealing tail plate and the wire sealing body, and sealing between the high-voltage wire and the socket is achieved. Through above 5 sealings for the charging socket is whole, has the ability of reaching waterproof grade IP67 in the design.

According to the invention, the arrangement of the inner isolation plate and the isolation structure on the rear cover completely isolates the high-low voltage loop in the socket, so that the reliability and the independence of the circuit in the socket are improved.

The main body part of the invention is made of 20% glass fiber reinforced PA6 plastic insulating material, the forming mode is simple, and the cost is lower after mass production.

In the invention, the charging interface belongs to a national standard interface, and the interface and the appearance are strictly designed according to the national standard; the socket body adopts integrated into one piece, and there are two kinds with the connected mode of other parts, and bolted connection is connected with joint structure, convenient assembling.

The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims

1. A direct current charging socket for a pure electric vehicle is characterized in that a national standard charging interface, a whole vehicle high-voltage interface and a whole vehicle low-voltage signal interface are arranged on the direct current charging socket;

2. A DC charging socket for a pure electric vehicle according to claim 1, wherein an inner isolation plate is further arranged between the rear cover and the socket body to isolate high and low voltage loops inside the DC charging socket; the high-voltage copper bar is arranged between the rear cover and the inner isolation plate.

3. The direct-current charging socket for the pure electric vehicle according to claim 2, wherein a high-voltage terminal via hole II, a high-voltage wire shielding layer connecting via hole and a mounting fixing hole are formed in the inner isolation plate; the inner isolation plate is fixed on the socket body through the mounting and fixing hole.

4. A direct-current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein an isolation structure and a sealing groove are arranged on the rear cover, and a multi-stage radial sealing ring is arranged in the sealing groove; and the periphery of the rear cover is also provided with a clamping structure II to be connected with the socket body in a clamping manner.

5. The direct-current charging socket for the pure electric vehicle according to claim 1, 2 or 3, wherein the high-voltage copper bar comprises three copper bars, namely a PE copper bar, a DC + copper bar and a DC-copper bar; and the high-voltage copper bar is welded with the corresponding high-voltage wire and then is arranged in the direct-current charging socket to be connected with the corresponding high-voltage terminal bolt.

6. The direct-current charging socket for the pure electric vehicle as claimed in claim 1, 2 or 3, wherein the national standard charging interface comprises a mounting flange, the charging interface positioned in front of the mounting flange is consistent with the national standard requirements, and a boss positioned at the rear of the mounting flange is provided with a low-voltage terminal mounting hole, a high-voltage terminal mounting hole and a mounting and positioning screw hole; the side surface of the boss is also provided with a clamping structure I so as to be clamped and connected with the socket body; the boss and the socket body are sealed by adopting a multi-stage radial sealing structure.

7. A direct-current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein a sealing structure matched with a charging gun is arranged inside a charging interface of the national standard charging interface to ensure the waterproof performance after the gun is inserted, and the sealing structure adopts a multi-stage radial sealing structure.

8. A direct current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein the socket body is a shell structure with openings at the upper and lower ends; the side wall of the high-voltage wiring harness inlet and outlet is provided with a high-voltage wiring harness inlet and outlet and a low-voltage signal plug-in mounting port, and the side wall of the high-voltage wiring harness inlet and outlet is also provided with a side clamping structure to be connected with the wire sealing tail cover; the side walls of the upper end and the lower end of the socket body are respectively provided with an upper clamping structure and a lower clamping structure so as to be respectively connected with the rear cover and the national standard charging interface; the socket is characterized in that a circuit board mounting plate is arranged inside the socket body, and fixing screw holes are formed in the circuit board mounting plate and matched with mounting and positioning screw holes in the national standard charging interface and fixing holes in the integrated circuit board.

9. A direct-current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein a sealing gasket is arranged between the low-voltage signal plug-in and the low-voltage signal plug-in mounting port and is fixedly connected with the low-voltage signal plug-in by an external tightening bolt.

10. A direct current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein the integrated circuit board comprises a PCB and a high-voltage wire shielding layer connection interface; on the PCB, a grounding point is connected to a PE point of the PCB from a PE shielding layer connecting point and is connected with a DC-shielding layer connecting point and a DC + shielding layer connecting point; a 1000 omega resistor is connected between the PE point and the CC 1; the low-voltage signal plug-in is connected with the printed circuit on the PCB board through a flat cable socket; temperature sensors RT1, RT2 are soldered on the PCB board and connected to the low voltage signal plug by printed circuit.

11. The direct-current charging socket for the pure electric vehicle according to claim 1, 2 or 3, wherein the wire sealing tail cover comprises a wire sealing tail cover body, the wire sealing tail cover body and the socket body are sealed through a sealing tail plate and a wire sealing body, the sealing tail plate is provided with a wire sealing body positioning structure, and the wire sealing body is provided with a high-voltage wire through hole; the wire sealing tail cover body is further provided with a clamping structure matched with the side clamping structure on the side wall of the high-voltage wire harness inlet and outlet.

12. A direct-current charging socket for a pure electric vehicle according to claim 1, 2 or 3, wherein the socket body, the rear cover, the national standard charging interface and the inner partition plate are respectively formed by dies, and the materials of the direct-current charging socket are 20% glass fiber reinforced PA 6.