A high-current charging device

Abstract

This invention proposes a high-current charging device, including a charging gun body and a charging port. The charging gun body includes a plug-in post, and the charging port includes a conductive sleeve. A tripping retaining ring is provided on the inner wall of the inner sleeve facing the charging gun body, and a tapered tripping slope is provided at the junction of the end face of the tripping retaining ring facing away from the charging gun body and the outer wall. A main elastic groove is provided at the front section of the conductive sleeve, and a secondary elastic groove is provided on the outer wall from the front section to the middle section. Buffer grooves are formed on the sleeve wall between adjacent secondary elastic grooves at the middle section of the conductive sleeve. An expansion slope adapted to the tripping slope is provided at the junction of the front end face of the conductive sleeve and the inner wall. This invention has the advantages of reliable connection, effectively reducing wear and insertion / removal resistance, while ensuring connection reliability.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle parts, specifically to a high-current charging device. Background Technology

[0002] With the popularization of new energy vehicles, charging often requires the compatibility of a charging gun with the vehicle's charging port. Currently, the charging time of new energy vehicles is often a major drawback. Therefore, innovations are generally made in batteries and charging piles to improve charging efficiency. However, the charging gun and the vehicle's charging port are frequently plugged and unplugged. Traditional plugging methods use a tight fit between the male and female connectors to ensure reliable electrical connections. However, while the tight fit ensures the effective current carrying area between conductors, it also increases the resistance to plugging and unplugging. For users of home charging piles, the amount of electricity charged every night is often difficult to compare with that of fast charging stations, so they plug and unplug almost every day. After too many plugging and unpluggings, the effective electrical contact area between the originally tightly fitted male and female connectors will decrease, resulting in increased current at local contact points, causing overheating, ablation, and welding failure, which can easily lead to safety hazards. This results in difficulty in plugging and unplugging in the early stages and reduced reliability in the later stages. For public charging piles, the high frequency of charging also leads to an increase in the number of plugging and unpluggings, further aggravating wear and tear. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide a high-current charging gun and a high-current charging device adapted thereto that are reliable in connection, effectively reduce wear and insertion resistance, and ensure connection reliability.

[0004] To address the above problems, the following technical solution is provided: A high-current charging device includes a gun body and a charging port that plugs into the gun body. The gun body includes a housing and a plug-in base disposed at the front end of the housing. The housing also has an unlocking lever. The end of the unlocking lever facing the plug-in base has a locking hook for engaging with the charging port to prevent detachment. The plug-in base has a plug-in hole, and a plug-in post is disposed within the plug-in hole. The plug-in post is truncated pyramidal in shape with its cone tip facing the charging port. The charging port includes an outer protective sleeve for inserting and accommodating the plug-in base. An inner protective sleeve that is adapted to be inserted into the plug-in hole is disposed within the outer protective sleeve. A conductive sleeve that is adapted to be inserted into the plug-in post is disposed within the inner protective sleeve. The inner wall of the inner protective sleeve facing the gun body has a release retaining ring that allows the plug-in post to pass through. The end face of the release retaining ring facing away from the gun body has a tapered release ramp at the junction with the outer ring wall. The inner wall of the front section of the conductive sleeve is... The conical shape fits snugly against the outer wall of the plug-in post. The front section of the conductive sleeve has main elastic grooves evenly distributed along its circumference, extending from the front end face towards the other end face. The conductive sleeve also has secondary elastic grooves evenly distributed along its circumference, extending from the front to the middle section of the outer wall, with the secondary elastic grooves located between adjacent main elastic grooves. Buffer grooves are formed on the cylinder wall between adjacent secondary elastic grooves at the middle section of the conductive sleeve. These buffer grooves are fan-shaped, extending from the wall of the secondary elastic groove towards the cross-section of the conductive sleeve in both clockwise and counterclockwise directions. The counterclockwise buffer grooves are located between adjacent clockwise buffer grooves, creating radial expansion and axial contraction elastic deformation allowances on the middle section of the conductive sleeve. The rear end of the conductive sleeve has a wiring hole. An expansion ramp adapted to the tripping ramp is provided at the junction of the front end face and the inner wall of the conductive sleeve.

[0005] In the above structure, the inner sleeve is used to accommodate the conductive sleeve and effectively prevent the conductive sleeve from being exposed. The main elastic groove of the conductive sleeve allows its front end to expand during insertion of the plug pin. However, expansion at only one end would cause a change in the taper of the inner wall of the conductive sleeve, resulting in an ineffective fit with the plug pin surface. Therefore, a secondary elastic groove is provided in conjunction with a buffer groove to expand the middle section of the conductive sleeve as well. This ensures that the front section of the conductive sleeve that fits the plug pin expands and contracts synchronously, thus maintaining a tight fit with the outer wall of the plug pin and increasing the effective contact area to ensure conductive current. Since the plug pin and the inner wall of the conductive sleeve are in a tapered fit, there is no contact or friction between them in the initial stage of insertion. They only come into contact rapidly after insertion. This effectively reduces sliding friction and improves insertion and extraction life. Since friction only exists in the tapered fit state, there is only a small amount of insertion and extraction resistance at the end of the entire insertion stroke and at the beginning of the extraction stroke. Therefore, compared to... The existing charging gun features resistance throughout the entire insertion and removal stroke, effectively reducing insertion and removal force. During insertion, after the connector and conductive sleeve make tight contact, there is a short pre-tightening stroke. This pre-tightening stroke pushes the front section of the conductive sleeve towards the rear section, compressing the buffer groove. This causes the buffer groove to push the front section of the conductive sleeve against the insertion direction of the connector, ensuring a tight fit between the conductive sleeve and the connector. Simultaneously, this pre-tightening stroke pushes the front section of the conductive sleeve away towards the rear section, separating the expansion ramp from the tripping ramp, forcing the front end of the conductive sleeve to recover its contraction force to wrap around the connector. In the initial stage of removal, the connector and conductive sleeve are in tight contact, exhibiting a conical interlocking state. As the charging gun is removed, the compressed buffer groove returns to its original position, and the front section of the conductive sleeve moves forward, causing its expansion ramp to contact the tripping ramp. Further removal causes the tripping ramp to compress the expansion ramp, causing the front end of the conductive sleeve to expand and counteract its own elastic force, thereby releasing the interlocked connector and achieving rapid disengagement.

[0006] The invention is further configured such that an axial blocking portion is provided on the inner wall of the end of the inner sleeve facing the gun body, and the tripping retaining ring is located on the side of the axial blocking portion facing away from the gun body.

[0007] In the above structure, the charging port is generally injection molded, and the axial blocking part is used to block the tripping retaining ring and reduce the possibility of the conductive sleeve being exposed. The separately set tripping retaining ring can be made of a more wear-resistant material; if the service life is not considered, the axial blocking part can also be directly replaced by the tripping retaining ring.

[0008] The present invention is further configured such that the tripping retaining ring is interference-fitted with the inner wall of the inner protective cylinder.

[0009] In the above structure, the interference fit of the trip ring can prevent it from shifting inside the inner casing.

[0010] The present invention is further configured such that the tripping retaining ring is a ceramic ring or a polytetrafluoroethylene ring.

[0011] In the above structure, the tripping retaining ring is preferably a polytetrafluoroethylene (PTFE) ring, which utilizes its self-lubricating properties to improve the smoothness of sliding between the tripping inclined surface and the expansion inclined surface. At the same time, its wear resistance is also effectively guaranteed, and the wear of the expansion inclined surface is reduced, thus achieving oil-free lubrication.

[0012] The invention is further configured such that when the plug is inserted into the conductive sleeve, after it comes into contact with the conical surface of the inner wall of the front section of the conductive sleeve, it expands radially under the yielding of the main elastic groove, the secondary elastic groove and the buffer groove to form a covering pre-tightening force. At the same time, under the action of the insertion force, the middle section of the front section of the conductive sleeve with the buffer groove deforms and moves backward, causing the expansion slope and the release slope to separate. Under the axial pushing of the buffer groove, the conductive sleeve is tightly fitted with the plug. At this time, the locking hook of the unlocking lever engages and locks with the charging port. When it is pulled out, the unlocking lever unlocks. When the gun body is pulled out, the plug drives the conductive sleeve, which is tightly fitted with its conical surface, to move towards the release retaining ring. At this time, the middle section of the conductive sleeve with the buffer groove deforms and elongates, causing the expansion slope and the release slope to abut against each other. Under the action of the axial force, the release slope pushes the expansion slope, causing the front end of the conductive sleeve to expand radially and release the plug.

[0013] In the above structure, the main elastic groove and the secondary elastic groove are both provided for the radial expansion and contraction of the conductive sleeve. The buffer groove can provide radial expansion and contraction for the conductive sleeve wall between adjacent secondary elastic grooves, and can also provide axial expansion and contraction for the front section of the conductive sleeve, thereby meeting the insertion and extraction requirements.

[0014] The present invention is further configured such that there are two or three plug posts, and the number of conductive sleeves is set to be equal to the number of plug posts.

[0015] In the above structure, the number of plug-in posts can be increased as needed.

[0016] The present invention is further configured such that the socket is provided with a grounding male plug and a data male plug; the outer protective sleeve is provided with a grounding female plug adapted to the grounding male plug and a data female plug adapted to the data male plug.

[0017] The invention is further configured such that the housing has a main chamber and a cable chamber that are interconnected, the top of the housing has a control slot, and the control slot has an electronic lock that is linked to the unlocking lever.

[0018] In the above structure, the electronic lock is used to control the locking and unlocking of the unlocking lever.

[0019] The present invention is further configured such that an axial retaining ring is provided on the outer wall of the rear section of the conductive sleeve, and a stepped hole is provided at the rear end of the charging port, which is concentric with the inner protective cylinder. The axial retaining ring is adapted to the bottom of the stepped hole, and a fastening ring is provided at the opening of the stepped hole, which is threaded to press the axial retaining ring into the stepped hole.

[0020] In the above structure, the conductive sleeve is fixed to the rear end of the charging port by a fastening ring, which restricts the axial position of the rear section of the conductive sleeve and ensures that the front section of the conductive sleeve can generate axial displacement when plugging and unplugging.

[0021] The present invention is further configured such that the conductive sleeve is made of brass or pure copper, and when the conductive sleeve is made of pure copper, its expansion slope is made of brass.

[0022] In the above structure, an additional brass material can be welded to the expansion bevel at the front section of the conductive sleeve as a base to improve wear resistance, and the two can be connected by friction welding.

[0023] The beneficial effects of this invention are: reliable connection, significantly increased current capacity within a fixed volume, easy insertion and removal, with only partial resistance occurring in the later stages of insertion and the early stages of removal, minimal wear during insertion and removal, and long service life. Attached Figure Description

[0024] Figure 1 This is a first-view overall structural diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective.

[0026] Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention.

[0027] Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention.

[0028] Figure 5 This is a schematic diagram of the plug-in post and conductive sleeve structure of the present invention.

[0029] Figure 6 For the present invention Figure 3 A magnified structural diagram of part A.

[0030] The labels in the diagram have the following meanings: 1-Gun body; 10-Shell; 101-Main chamber; 102-Cable chamber; 103-Control slot; 11-Plug-in socket; 111-Plug-in hole; 112-Plug-in post; 12-Unlock lever; 121-Locking hook; 13-Grounding male plug; 14-Data male plug; 2-Charging port; 20-Outer casing; 21-Inner casing; 211-Axial blocking part; 22-Conductive sleeve; 221-Main elastic groove; 222-Secondary elastic groove; 223-Buffer groove; 224-Wiring hole; 225-Expansion bevel; 226-Axial retaining ring; 23-Trigger retaining ring; 231-Trigger bevel; 24-Grounding female plug; 25-Data female plug; 26-Stepped hole; 27-Fastening ring. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] refer to Figures 1 to 6 ,like Figures 1 to 6The high-current charging device shown includes a gun body 1 and a charging port 2 that plugs into the gun body 1. The gun body 1 includes a housing 10 and a plug-in base 11 disposed at the front end of the housing 10. The housing 10 also has an unlocking lever 12. The end of the unlocking lever 12 facing the plug-in base 11 has a locking hook 121 for engaging with the charging port 2 to prevent detachment. The plug-in base 11 has a plug-in hole 111, and a plug-in post 112 is disposed in the plug-in hole 111. The plug-in post 112 is truncated pyramidal in shape with its cone tip facing the charging port 2. The charging port 2 includes an outer sleeve 20 for inserting and accommodating a connector 11. The outer sleeve 20 contains an inner sleeve 21 adapted to be inserted into the connector hole 111. The inner sleeve 21 contains a conductive sleeve 22 adapted to be inserted into the connector post 112. The inner wall of the inner sleeve 21 facing the gun body 1 has a release ring 23 through which the connector post 112 can pass. The release ring 23 has a tapered release ramp 231 at the junction of its end face facing away from the gun body 1 and the outer ring wall. The inner wall of the front section of the conductive sleeve 22... The conductive sleeve 22 is tapered and fits snugly against the outer wall of the insertion post 112. The front section of the conductive sleeve 22 has main elastic grooves 221 evenly distributed along its circumference, extending from the front end face towards the other end face. The conductive sleeve 22 also has secondary elastic grooves 222 evenly distributed along its circumference, formed on the outer wall from the front section to the middle section. The secondary elastic grooves 222 are located between adjacent main elastic grooves 221. Buffer grooves 223 are formed on the sleeve wall between adjacent secondary elastic grooves 222 at the middle section of the conductive sleeve 22. The grooves 223 are fan-shaped, extending from the wall of the secondary elastic groove 222 towards the cross-section of the conductive sleeve 22 in both clockwise and counterclockwise directions. The buffer grooves 223 opened in the counterclockwise direction are located between the adjacent buffer grooves 223 opened in the clockwise direction, so that the middle section of the conductive sleeve 22 has a radial expansion elastic deformation margin and an axial expansion elastic deformation margin. The rear end of the conductive sleeve 22 is provided with a wiring hole 224. The front end face of the conductive sleeve 22 is provided with an expansion slope 225 that is adapted to the tripping slope 231 at the junction with the inner wall.

[0033] In the above structure, the inner sleeve 21 is used to accommodate the conductive sleeve 22 and effectively prevent the conductive sleeve 22 from being exposed. The main elastic groove 221 of the conductive sleeve 22 allows its front end to expand and retract when the plug post 112 is inserted. However, simple expansion and retraction at one end will cause the taper of the inner wall of the conductive sleeve 22 to change, resulting in an inability to effectively adapt to the surface of the plug post 112. Therefore, a secondary elastic groove 222 is provided in conjunction with a buffer groove 223 to make the middle section of the conductive sleeve 22 also expand, thereby ensuring that the front section of the conductive sleeve 22 that adapts to the plug post 112 can expand and retract synchronously, thus achieving the desired effect. The system maintains a tight fit with the outer wall of the insertion post 112, increasing the effective contact area to ensure conductive current. Since the insertion post 112 and the inner wall of the conductive sleeve 22 have a conical fit, there is no contact or friction between them during the initial insertion phase. Contact only occurs rapidly after insertion is complete, effectively reducing sliding friction and improving insertion / removal life. Because friction only exists in the conical fit state, a small amount of insertion / removal resistance exists only at the end of the insertion stroke and at the beginning of the withdrawal stroke. Therefore, compared to existing systems where resistance exists throughout the entire insertion / removal stroke... The charging gun effectively reduces the force required for insertion and removal. After the plug pin 112 and conductive sleeve 22 make tight contact during insertion, there is a short pre-tightening stroke. This means the plug pin pushes the front section of the conductive sleeve 22 towards the rear section, compressing the buffer groove 223. This causes the buffer groove 223 to push the front section of the conductive sleeve 22 against the plug pin 112 in the insertion direction, ensuring the conductive sleeve 22 remains tightly engaged with the plug pin 112. Simultaneously, this pre-tightening stroke pushes the front section of the conductive sleeve 22 away towards the rear section, causing the expansion ramp 225 and the tripping ramp 23 to engage. 1. Separation forces the front end of the conductive sleeve 22 to recover its contraction force to wrap around the plug post 112. In the initial stage of pulling out, the plug post 112 and the conductive sleeve 22 are in close contact and exhibit a conical interlocking state. As the charging gun is pulled out, the compressed buffer groove 223 is reset, and the front section of the conductive sleeve 22 moves forward so that its expansion slope 225 contacts the tripping slope 231. With further pulling out, the tripping slope 231 squeezes the expansion slope 225, causing the front end of the conductive sleeve 22 to expand and offset its own elastic force, thereby releasing the interlocked plug post 112 and achieving the purpose of rapid disengagement.

[0034] In this embodiment, the inner wall of the inner sleeve 21 facing the gun body 1 is also provided with an axial blocking part 211, and the release ring 23 is located on the side of the axial blocking part 211 facing away from the gun body 1.

[0035] In the above structure, the charging port 2 is generally produced by injection molding. The axial blocking part 211 is used to block the tripping retaining ring 23 and at the same time reduce the possibility of the conductive sleeve 22 being exposed. The separately set tripping retaining ring 23 can be made of more wear-resistant materials. If the service life is not considered, the axial blocking part 211 can also be directly replaced by the tripping retaining ring 23.

[0036] In this embodiment, the tripping retaining ring 23 is interference-fitted with the inner wall of the inner protective sleeve 21.

[0037] In the above structure, the interference fit release retainer ring 23 can prevent it from shifting inside the inner casing 21.

[0038] In this embodiment, the tripping retaining ring 23 is a ceramic ring or a polytetrafluoroethylene ring.

[0039] In the above structure, the tripping retaining ring 23 is preferably a polytetrafluoroethylene ring, which uses its own self-lubricating properties to improve the smoothness of sliding between the tripping inclined surface 231 and the expansion inclined surface 225. At the same time, its wear resistance is also effectively guaranteed, and the wear of the expansion inclined surface 225 is reduced, thus achieving oil-free lubrication.

[0040] In this embodiment, when the insertion post 112 is inserted into the conductive sleeve 22, after it comes into contact with the conical surface of the inner wall of the front section of the conductive sleeve 22, it expands radially under the yielding of the main elastic groove 221, the secondary elastic groove 222, and the buffer groove 223 to form a covering pre-tightening force. At the same time, under the action of the insertion force, the middle section of the conductive sleeve 22 with the buffer groove 223 deforms and retracts, causing the expansion slope 225 to separate from the release slope 231. Under the axial pushing of the buffer groove 223, the conductive sleeve 22 fits tightly with the insertion post 112. At this time, The locking hook 121 of the unlocking lever 12 engages and locks with the charging port 2; when pulled out, the unlocking lever 12 unlocks, and when the gun body 1 is pulled out, the plug post 112 drives the conductive sleeve 22, which is in close contact with its conical surface, to move towards the release retaining ring 23. At this time, the middle section of the conductive sleeve 22, which has a buffer groove 223, deforms and elongates, causing the expansion slope 225 to abut against the release slope 231. Under the action of axial force, the release slope 231 pushes the expansion slope 225, causing the front end of the conductive sleeve 22 to expand radially and release the plug post 112.

[0041] In the above structure, the main elastic groove 221 and the secondary elastic groove 222 are both provided for the radial expansion and contraction of the conductive sleeve 22. The buffer groove 223 can provide radial expansion and contraction for the wall of the conductive sleeve 22 between adjacent secondary elastic grooves 222, and can also provide axial expansion and contraction for the front section of the conductive sleeve 22, thereby meeting the insertion and removal requirements.

[0042] In this embodiment, there are two or three plug-in posts 112, and the number of conductive sleeves 22 is set to be equal to the number of plug-in posts 112.

[0043] In the above structure, the number of plug-in posts 112 can be increased as needed.

[0044] In this embodiment, the socket 11 is further provided with a grounding male socket 13 and a data male socket 14; the outer protective sleeve 20 is provided with a grounding female socket 24 adapted to the grounding male socket 13 and a data female socket 25 adapted to the data male socket 14.

[0045] In this embodiment, the housing 10 is provided with a main chamber 101 and a cable chamber 102 that are connected to each other. The top of the housing 10 is provided with a control groove 103, and the control groove 103 is provided with an electronic lock (not shown in the figure) that is linked to the unlocking lever 12.

[0046] In the above structure, the electronic lock is used to control the locking and unlocking of the unlocking lever 12.

[0047] In this embodiment, the outer wall of the rear section of the conductive sleeve 22 is provided with an axial retaining ring 226, and the rear end of the charging port 2 is provided with a stepped hole 26 that is concentrically arranged with the inner protective cylinder 21. The axial retaining ring 226 is adapted to the bottom of the stepped hole 26, and a fastening ring 27 is provided at the opening of the stepped hole 26 to engage with it and press the axial retaining ring 226 into the stepped hole 26.

[0048] In the above structure, the conductive sleeve 22 is fixed to the rear end of the charging socket 2 by the fastening ring 27, and the axial position of the rear section of the conductive sleeve 22 is restricted to ensure that the front section of the conductive sleeve 22 can generate axial displacement when plugging and unplugging.

[0049] In this embodiment, the conductive sleeve 22 is made of brass or pure copper. When the conductive sleeve 22 is made of pure copper, its expansion slope 225 is made of brass.

[0050] In the above structure, an additional brass material can be welded to the expansion slope 225 at the front section of the conductive sleeve 22 as a basis to improve wear resistance, and the two can be connected by friction welding.

[0051] The beneficial effects of this invention are: reliable connection, significantly increased current capacity within a fixed volume, easy insertion and removal, with only partial resistance occurring in the later stages of insertion and the early stages of removal, minimal wear during insertion and removal, and long service life.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.

Claims

1. A high-current charging device, comprising a gun body and a charging port for insertion into the gun body, the gun body comprising a housing and a plug-in base disposed at the front end of the housing, the housing further comprising an unlocking lever, the end of the unlocking lever facing the plug-in base having a locking hook for engaging with the charging port to prevent detachment, the plug-in base having a plug-in hole, the plug-in hole having a plug-in post, the plug-in post being truncated conical with its cone tip facing the charging port, characterized in that: The charging port includes an outer casing for inserting and accommodating a connector, an inner casing inside the outer casing that is adapted to the connector hole, and a conductive sleeve inside the inner casing for adapting to the connector post. The inner wall of the inner casing facing the gun body has a release ring that allows the connector post to pass through. The end face of the release ring facing away from the gun body has a tapered release ramp at its junction with the outer wall. The inner wall of the front section of the conductive sleeve is tapered and fits snugly against the outer wall of the connector post. The front section of the conductive sleeve has evenly distributed... The conductive sleeve is provided with a main elastic groove extending from the front end face towards the other end face. It also has secondary elastic grooves evenly distributed along its circumference, located on the outer wall from the front section to the middle section. These secondary elastic grooves are situated between adjacent main elastic grooves. Buffer grooves are formed on the cylinder wall between adjacent secondary elastic grooves at the middle section of the conductive sleeve. These buffer grooves are fan-shaped, extending clockwise and counterclockwise from the wall of the secondary elastic groove towards the cross-section of the conductive sleeve. The buffer grooves in the counterclockwise direction are positioned adjacent to those in the clockwise direction. The design incorporates buffer grooves to allow for radial expansion and axial contraction of the conductive sleeve's middle section wall, creating elastic deformation margins. A wiring hole is located at the rear end of the conductive sleeve. An expansion ramp, adapted to the tripping ramp, is located at the junction of the front end face and the inner wall of the conductive sleeve. When the insertion post is inserted into the conductive sleeve, it conforms to the conical surface of the inner wall of the front section of the conductive sleeve. Under the yielding of the main elastic groove, secondary elastic groove, and buffer groove, it radially expands to form a pre-tightening force. Simultaneously, under the insertion force, the middle section of the conductive sleeve with the buffer groove deforms... The backward movement causes the expansion ramp to separate from the tripping ramp. Under the axial push of the buffer groove, the conductive sleeve fits tightly against the plug post. At this time, the locking hook of the unlocking lever engages and locks with the charging port. When the gun is pulled out, the unlocking lever unlocks. When the gun body is pulled out, the plug post drives the conductive sleeve, which fits tightly with its conical surface, to move towards the tripping retaining ring. At this time, the middle section of the conductive sleeve with the buffer groove deforms and elongates, causing the expansion ramp to abut against the tripping ramp. Under the action of axial force, the tripping ramp pushes the expansion ramp, causing the front end of the conductive sleeve to expand radially and loosen the plug post.

2. The high-current charging device according to claim 1, characterized in that: The inner wall of the inner sleeve facing the gun body is also provided with an axial blocking part, and the release ring is located on the side of the axial blocking part facing away from the gun body.

3. The high-current charging device according to claim 2, characterized in that: The tripping retaining ring is interference-fitted with the inner wall of the inner casing.

4. A high-current charging device according to claim 1, 2, or 3, characterized in that: The tripping retainer ring is a ceramic ring or a polytetrafluoroethylene ring.

5. A high-current charging device according to claim 1, 2, or 3, characterized in that: The number of plugs is two or three, and the number of conductive sleeves is equal to the number of plugs.

6. A high-current charging device according to claim 1, characterized in that: The connector is also provided with a grounding male connector and a data male connector; the outer casing is provided with a grounding female connector adapted to the grounding male connector and a data female connector adapted to the data male connector.

7. A high-current charging device according to claim 1, characterized in that: The housing contains a main chamber and a cable chamber that are interconnected. The top of the housing has a control slot, which contains an electronic lock that is linked to the unlocking lever.

8. A high-current charging device according to claim 1, characterized in that: The outer wall of the rear section of the conductive sleeve is provided with an axial retaining ring, and the rear end of the charging port is provided with a stepped hole that is concentric with the inner protective cylinder. The axial retaining ring is adapted to the bottom of the stepped hole, and a fastening ring is provided at the opening of the stepped hole to engage with it and press the axial retaining ring into the stepped hole.

9. A high-current charging device according to claim 4, characterized in that: The conductive sleeve is made of brass or pure copper. When the conductive sleeve is made of pure copper, its expansion slope is made of brass.

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