National standard liquid-cooled dc charging gun

Abstract

The utility model relates to new energy electric automobile field discloses a national standard liquid cooling direct current charging gun, including gun head casing, handle casing and liquid cooling cable, be provided with DC terminal on the gun head casing, be provided with liquid cooling pipe in the liquid cooling cable, be provided with power conductor and fill cooling liquid in the liquid cooling pipe, the liquid cooling pipe is butt jointed with the gun head water nozzle, and power conductor passes through the gun head water nozzle and DC terminal welding conduction, be provided with locking assembly on handle casing, be provided with lock wire assembly between liquid cooling cable and handle casing. The above-mentioned national standard liquid cooling direct current charging gun adopts the mode of water copper and sets up the liquid cooling pipe in power conductor outside, improves liquid cooling heat dissipation efficiency, reduces cable size and weight, in addition, through locking assembly improves the use safety and the operating convenience of this national standard liquid cooling direct current charging gun, through lock wire assembly improves the sealing property at the tail liquid cooling cable, satisfies the high -power charging requirement.

Description

Technical Field

[0001] This utility model relates to the field of new energy electric vehicles, and in particular to a national standard liquid-cooled DC charging gun. Background Technology

[0002] With the increasing popularity of electric vehicles, users have higher and higher demands for charging speed and convenience, making high-power fast charging an inevitable trend in the market. Traditional charging equipment mostly uses air cooling, which has limited heat dissipation capacity and cannot meet the heat dissipation requirements of the large amount of heat generated during high-power charging. This leads to excessively high temperatures under high load operation, affecting charging efficiency and equipment lifespan. For example, when the charging current reaches a certain value, the heat generated by the conductive holes and connecting flexible wires in the charging socket cannot be dissipated effectively, causing excessive temperature. To avoid accidents, the actual charging current is usually controlled at a lower level, prolonging the charging time. Given the continuous increase in charging power, the advantages of liquid cooling will become more apparent, and it is expected to become an important supplement to air cooling, gradually gaining widespread application in high-power charging scenarios.

[0003] However, DC charging guns with liquid cooling structures still have the following issues that need improvement:

[0004] 1) The charging gun housing is an assembly, and moisture, dust, etc. can easily enter the interior of the charging gun housing from the protruding parts of the charging terminals, the splicing parts of the charging gun housing, and the places where the tail cable is inserted, affecting the electrical connection.

[0005] 2) Liquid cooling requires the installation of liquid cooling pipes, which increases the structural complexity of the original cables and poses a risk of coolant leakage.

[0006] 3) When using the charging gun, there is a situation where it is plugged in and unplugged while it is powered on. In order to ensure safety, the charging station can only be controlled to cut off the charging circuit by going to the charging station, the vehicle's infotainment system, or the mobile phone before unplugging the gun. The operation process is cumbersome. Utility Model Content

[0007] Based on the above, the purpose of this utility model is to provide a national standard liquid-cooled DC charging gun that ensures heat dissipation and safety, and meets the requirements for high-power charging.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A national standard liquid-cooled DC charging gun includes a gun head housing, a handle housing, and a liquid-cooled cable. The head end of the gun head housing and the handle housing are combined to form a mounting cavity. The liquid-cooled cable extends into the mounting cavity from the tail end of the handle housing. The mounting cavity is provided with an inner liner and a gun head water nozzle. The inner liner and the gun head water nozzle are combined to form a cooling cavity. A DC terminal extending into the cooling cavity is provided on the gun head housing. A liquid-cooled tube is provided in the liquid-cooled cable. A power conductor is passed through the liquid-cooled tube and filled with coolant. The liquid-cooled tube is connected to the gun head water nozzle, and the power conductor passes through the gun head water nozzle and is soldered to the DC terminal in the cooling cavity to form a charging circuit.

[0010] The handle housing is equipped with a locking component, which is used to lock with the vehicle charging port to lock the national standard liquid-cooled DC charging gun to the vehicle charging port, and to automatically send a signal to the charging pile to cut off the charging circuit before operation and unlocking of the vehicle charging port.

[0011] A locking assembly is provided between the liquid cooling cable and the handle housing. The locking assembly is used to fix the liquid cooling cable and seal the tail end of the handle housing.

[0012] As an alternative, the liner is fixedly connected to the gun head housing, and a positioning buckle is clamped between the liner and the gun head housing. The surface of the DC terminal is provided with a slot that engages with the positioning buckle. A first sealing ring that is in close contact with the liner is provided on the DC terminal and on one side of the slot. A second sealing ring that is in close contact with the gun head housing is provided on the DC terminal and on the other side of the slot.

[0013] As an alternative, the nozzle is fixed to the liner by bolts. One end of the nozzle extends into the liner and is equipped with a third sealing ring that is in close contact with the liner. The other end of the nozzle is equipped with a pagoda connector that is interference fit with the liquid cooling pipe, and a clamp is provided on the outside of the liquid cooling pipe to tighten the liquid cooling pipe and the pagoda connector.

[0014] As an alternative, a leak sensor is installed inside the mounting cavity and below the cooling cavity to monitor whether the coolant is leaking.

[0015] As an alternative, the locking assembly includes a locking rod, a receiving cavity is provided inside the handle housing, a support seat is provided on the cavity wall of the receiving cavity, the middle part of the locking rod is rotatably connected to the support seat, one end of the locking rod extends out of the handle housing and forms a locking hook, and the other end of the locking rod protrudes from the surface of the handle housing and forms a button.

[0016] An electromagnet is provided in the accommodating cavity and near the locking hook. An armature that cooperates with the electromagnet is provided on the locking rod. The electromagnet is used to attract the armature when energized, so that the locking rod is kept in the locked state and the button part cannot drive the locking rod.

[0017] The surface of the button is covered with a soft rubber layer, and a cavity is provided below the soft rubber layer. A sensing switch is provided in the cavity. The sensing switch is triggered when the button is pressed and the soft rubber layer is deformed. After being triggered, the sensing switch is used to send a signal to the charging pile to cut off the charging circuit and de-energize the electromagnet, so that the button can drive the locking lever to unlock.

[0018] As an alternative, there is a gap between the sensing switch and the soft rubber layer, so that the sensing switch can only be triggered after the soft rubber layer is pressed for a set distance.

[0019] And / or, the sensor switch can only be triggered after the soft rubber layer has been pressed and deformed and has been in contact with the sensor switch for a set time.

[0020] As an alternative, a bottom cover is provided on the back of the button, and a spring is provided between the bottom cover and the cavity wall of the receiving cavity. Positioning posts for installing the spring are provided on the bottom cover and the cavity wall of the receiving cavity, respectively.

[0021] As an alternative, a micro switch is provided in the accommodating cavity and near the locking hook. The micro switch is used to be triggered when the locking rod is in the locked state and to send a locking signal back to the charging pile.

[0022] As an optional solution, the locking assembly includes a sealing ring, a circular claw, and a claw fixing ring sequentially fitted onto the liquid-cooled cable. One side of the circular claw abuts against the sealing ring, and several annularly distributed claw arms are provided on the other side of the circular claw. The claw arms extend along the axial direction of the liquid-cooled cable, and the claw fixing ring is fitted over each claw arm and applies a radial force to the claw arm, so that the circular claw grips the liquid-cooled cable tightly.

[0023] As an optional solution, the cable locking assembly also includes a tail cap and a cable protector. The tail cap is fixed to the tail end port of the handle housing and seals the sealing ring, circular claw, and claw fixing ring in the mounting cavity. The tail cap has a through hole for the liquid-cooled cable to pass through. The cable protector is fitted onto the liquid-cooled cable and makes sealed contact with the hole wall.

[0024] The beneficial effects of this utility model are:

[0025] This national standard liquid-cooled DC charging gun uses a water-coated copper method to sleeve the liquid cooling tube outside the power conductor, and the part where the DC terminal is welded to the power conductor is placed in the cooling cavity of the inner liner for sufficient cooling, which improves the liquid cooling heat dissipation efficiency and reduces the size and weight of the cable. In addition, while ensuring the liquid cooling heat dissipation function, the locking component improves the safety and ease of operation of this national standard liquid-cooled DC charging gun, and the cable locking component improves the sealing of the liquid cooling cable at the tail, thereby improving the protection level of this national standard liquid-cooled DC charging gun and meeting the requirements of high-power charging. Attached Figure Description

[0026] Figure 1This is a partial structural schematic diagram of the national standard liquid-cooled DC charging gun provided in this embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the gun end structure of the national standard liquid-cooled DC charging gun provided in this embodiment of the utility model;

[0028] Figure 3 yes Figure 2 Section AA (without lining);

[0029] Figure 4 yes Figure 2 Cross-sectional view of the middle section (BB);

[0030] Figure 5 This is a cross-sectional schematic diagram of the liquid-cooled cable in the national standard liquid-cooled DC charging gun provided in this embodiment of the utility model.

[0031] In the attached image:

[0032] 1. Gun head casing;

[0033] 2. Handle housing; 21. Receiving cavity; 22. Support base; 23. Cover plate;

[0034] 3. Liquid-cooled cable; 31. Liquid-cooled pipe; 32. Power conductor; 33. CC1 harness; 34. CC2 harness; 35. S+ harness; 36. S- harness; 37. A+ harness; 38. A- harness; 39. PE harness;

[0035] 4. Lining;

[0036] 5. Water nozzle; 51. Third sealing ring; 52. Pagoda connector;

[0037] 6. DC terminal; 61. Positioning buckle; 62. First sealing ring; 63. Second sealing ring; 64. Flat part;

[0038] 7. Locking assembly; 71. Locking rod; 711. Locking hook; 712. Button; 72. Soft rubber layer; 73. Sensing switch; 74. Bottom cover; 75. Spring; 76. Electromagnet; 77. Armature; 78. Micro switch; 79. Positioning post;

[0039] 8. Wire locking assembly; 81. Sealing ring; 82. Circular ring claw; 83. Claw fixing ring; 84. Tail cap; 85. Wire protection sleeve. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0045] Please see Figures 1 to 4As shown, this embodiment provides a national standard liquid-cooled DC charging gun, including a gun head housing 1, a handle housing 2, and a liquid-cooled cable 3. The head end of the gun head housing 1 and the handle housing 2 are combined to form a mounting cavity. The liquid-cooled cable 3 extends into the mounting cavity from the tail end of the handle housing 2. An inner liner 4 and a gun head water nozzle 5 are provided in the mounting cavity. The inner liner 4 and the gun head water nozzle 5 are combined to form a cooling cavity. A DC terminal 6 extending into the cooling cavity is provided on the gun head housing 1. A liquid-cooled pipe 31 is provided in the liquid-cooled cable 3. A power conductor 32 is passed through the liquid-cooled pipe 31 and filled with coolant. The power conductor 32 passes through the nozzle 5 and is welded to the DC terminal 6 in the cooling chamber to form a charging circuit. A locking component 7 is provided on the handle housing 2. The locking component 7 is used to lock with the vehicle charging port to lock the national standard liquid-cooled DC charging gun to the vehicle charging port. It is also used to automatically send a signal to the charging pile to cut off the charging circuit before operation and unlocking of the vehicle charging port. A wire locking component 8 is provided between the liquid-cooled cable 3 and the handle housing 2. The wire locking component 8 is used to fix the liquid-cooled cable 3 and seal the tail end of the handle housing 2.

[0046] Therefore, by using a water-coated copper method to sleeve the liquid cooling pipe 31 outside the power conductor 32, and placing the part where the DC terminal 6 is welded to the power conductor 32 in the cooling cavity of the inner liner 4 for sufficient cooling, the liquid cooling heat dissipation efficiency is improved, and the cable size and weight are reduced. In addition, while ensuring the liquid cooling heat dissipation function, the locking component 7 improves the safety and ease of operation of this national standard liquid-cooled DC charging gun, and the locking component 8 improves the sealing of the tail liquid-cooled cable 3, thereby improving the protection level of this national standard liquid-cooled DC charging gun and meeting the requirements of high-power charging.

[0047] According to the national standard charging gun specifications, in addition to two DC terminals 6, the gun head housing 1 is also equipped with a PE terminal (grounding protection), an S+ terminal / S- terminal (signal communication), a CC1 terminal / CC2 terminal (charging connection confirmation), and an A+ terminal / A- terminal (auxiliary power supply). The arrangement of each terminal is as follows: Figure 2 As shown; the layout of the various wire harnesses connecting to each terminal within the liquid-cooled cable 3 is as follows. Figure 5 As shown, each DC terminal 6 is provided with two liquid cooling pipes 31, for a total of four liquid cooling pipes 31, forming a two-inlet and two-outlet liquid cooling passage. The four liquid cooling pipes 31 are distributed at the four corners and twisted together with the PE wire harness 39 to form a cable. The CC1 wire harness 33 is passed through the middle area of ​​the four liquid cooling pipes 31. The CC2 wire harness 34, S+ wire harness 35, S- wire harness 36, A+ wire harness 37, and A- wire harness 38 are distributed in the outer gap between the four liquid cooling pipes 31 and the PE wire harness 39, and the liquid cooling cable 3 is filled with filler material.

[0048] Through the above-mentioned liquid cooling structure, the outer diameter of the liquid-cooled cable 3 can be significantly reduced, solving the problems of heavy weight and difficulty in bending of high-power charging gun cables, as well as the difficulties in operation and storage. At the same time, the bending radius is reduced, solving the problems of large bending radius of round cables, large space occupation, and torsional stress when suspended or dragged on the ground during charging.

[0049] Figure 5 The structure is equipped with four liquid cooling pipes 31, each corresponding to two nozzles 5 and two independent cooling chambers. Two liquid cooling pipes 31 with the same polarity of the internal power conductors 32 are connected to the same nozzle 5. A DC terminal 6 is simultaneously connected to two power conductors 32 in one cooling chamber, and the two liquid cooling pipes 31 connected to each cooling chamber form one inlet and one outlet liquid cooling channels, thus forming a two-inlet and two-outlet coolant circulation loop to ensure heat dissipation.

[0050] Alternatively, in some embodiments, for the two DC terminals 6, two liquid cooling pipes 31 and two power conductors 32 can be respectively provided, and one nozzle 5 and one cooling cavity are provided. The nozzle 5 is connected to the two liquid cooling pipes 31, and the two DC terminals 6 and the two power conductors 32 are connected one-to-one in the cooling cavity. The two liquid cooling pipes 31 form a liquid cooling channel with one inlet and one outlet, but the coolant is required to have insulating properties. In this way, a complete liquid cooling path is formed, and the insulation between the positive and negative power conductors 32 is ensured by the insulating coolant, thereby reducing the arrangement of liquid cooling pipes 31 and simplifying the structure of the liquid-cooled cable 3.

[0051] In other embodiments, for the two DC terminals 6, three liquid cooling pipes 31 and three power conductors 32 are respectively provided. Two cooling chambers are interconnected. A nozzle 5 connected to the first cooling chamber is connected to one liquid cooling pipe 31, and a nozzle 5 connected to the second cooling chamber is connected to two liquid cooling pipes 31. One DC terminal 6 is connected to one power conductor 32 in the first cooling chamber, and the other DC terminal 6 is connected to both power conductors 32 in the second cooling chamber. The three liquid cooling pipes 31 form a liquid cooling channel with one inlet and two outlets or two inlets and one outlet, and the coolant has insulating properties. Similarly, a complete liquid cooling path can be formed, and the insulation between the positive and negative power conductors 32 is ensured by the insulating coolant, thereby reducing the arrangement of liquid cooling pipes 31, simplifying the structure of the liquid-cooled cable 3, and making the configuration more flexible.

[0052] Furthermore, the liquid-cooled cable 3 here is exemplified by a conventional round cable. However, the liquid-cooled cable 3 can also be changed from a round cable to a flat cable, with multiple liquid-cooled tubes 31 arranged along the cross-sectional length of the liquid-cooled cable 3. The advantage of a flat cable is that it reduces the bending radius of the liquid-cooled cable 3, improves its bending performance, enhances its spatial adaptability, increases its dynamic flexibility, strengthens its anti-interference performance, and makes it more convenient to use.

[0053] Optionally, the inner liner 4 is fixedly connected to the gun head housing 1, and a positioning buckle 61 is sandwiched between the inner liner 4 and the gun head housing 1. The surface of the DC terminal 6 is provided with a slot that engages with the positioning buckle 61. A first sealing ring 62 that is in close contact with the inner liner 4 is provided on the DC terminal 6 and on one side of the slot. A second sealing ring 63 that is in close contact with the gun head housing 1 is provided on the DC terminal 6 and on the other side of the slot.

[0054] The inner liner 4 is injection molded and has two inner cavities according to the two DC terminals 6 with positive and negative polarities. These cavities mainly serve to provide electrical insulation and isolation, contain coolant to form a liquid cooling passage, and install and fix the DC terminals 6. After the DC terminals 6 are welded to the power conductor 32 that passes through the nozzle 5, they are inserted into the cooling cavity. After being axially installed, the positioning buckle 61 is inserted from the side. The sealing performance of the cooling cavity and the mounting cavity is improved by the first sealing ring 62 and the second sealing ring 63, respectively, which prevents coolant leakage and prevents external moisture and dust from entering. In addition, the DC terminals 6 and the power conductor 32 are ultrasonically welded, and the DC terminals 6 are provided with a flat part 64 to ensure the welding conductivity.

[0055] Furthermore, a temperature sensor is installed on the liner 4, with the temperature sensor's measuring head abutting against the positioning buckle 61. The temperature sensor is used to monitor the temperature of the DC terminal 6.

[0056] In response, the positioning buckle 61 is made of a metal with strong thermal conductivity and a certain yield strength. While axially fixing the DC terminal 6, it can also conduct the working temperature of the DC terminal 6 to the external temperature sensor to detect abnormal overload conditions in a timely manner.

[0057] Optionally, the nozzle 5 is fixed to the liner 4 by bolts. One end of the nozzle 5 extends into the liner 4 and is provided with a third sealing ring 51 that is in close contact with the liner 4. The other end of the nozzle 5 is provided with a pagoda connector 52 that is interference-fitted with the liquid cooling pipe 31. A clamp is provided on the outside of the liquid cooling pipe 31 to tighten the liquid cooling pipe 31 and the pagoda connector 52.

[0058] Therefore, the sealing performance of the cooling chamber is improved by the third sealing ring 51, and the reliable connection between the liquid cooling pipe 31 and the nozzle 5 is improved by the pagoda connector 52 and the external clamp, thus preventing coolant leakage.

[0059] Optionally, a leakage sensor is installed inside the mounting cavity and below the cooling cavity. The leakage sensor is used to monitor whether the coolant is leaking, to ensure that the liquid cooling function is normal, and to detect leakage faults in a timely manner to ensure safe use.

[0060] Optionally, the locking assembly 7 includes a locking rod 71. A receiving cavity 21 is provided inside the handle housing 2, and a support seat 22 is provided on the cavity wall of the receiving cavity 21. The middle part of the locking rod 71 is rotatably connected to the support seat 22. One end of the locking rod 71 extends out of the handle housing 2 and forms a locking hook portion 711, while the other end of the locking rod 71 protrudes from the surface of the handle housing 2 and forms a button portion 712. An electromagnet 76 is provided in the receiving cavity 21 near the locking hook portion 711, and an armature 77 cooperating with the electromagnet 76 is provided on the locking rod 71. The electromagnet 76 is used to... When energized, the armature 77 is attracted, keeping the locking lever 71 locked and preventing the button 712 from driving the locking lever 71. The surface of the button 712 is provided with a soft rubber layer 72, and a cavity is provided below the soft rubber layer 72. A sensing switch 73 is provided in the cavity. The sensing switch 73 is triggered when the button 712 is pressed and the soft rubber layer 72 is deformed. The sensing switch 73 is used to send a signal to the charging pile to cut off the charging circuit and de-energize the electromagnet 76 after being triggered, so that the button 712 can drive the locking lever 71 to unlock.

[0061] Therefore, the cooperation between the electromagnet 76 and the armature 77 can keep the locking lever 71 locked, and the button 712 cannot be pressed normally, thus avoiding accidental operation. The sensing switch 73 is only triggered when there is a clear unlocking operation. After the signal is sent to the charging pile to reduce the voltage and current to a safe range and the electromagnet 76 is de-energized and releases the armature 77, the button 712 can be pressed to unlock, which improves the safety of use. In addition, due to the presence of the sensing switch 73, there is no need to perform additional operations to control the charging pile to cut off the charging circuit, making the unlocking process faster and more convenient.

[0062] Specifically, there is a gap between the sensing switch 73 and the soft rubber layer 72, so that the sensing switch 73 can only be triggered after the soft rubber layer 72 is pressed for a set distance; or, the sensing switch 73 can only be triggered after the soft rubber layer 72 is pressed and deformed and continues to contact the sensing switch 73 for a set time.

[0063] Whether setting a travel distance, a time limit, or both, the goal is to prevent accidental triggering of the sensing switch 73, which could cause the charging process to stop unexpectedly and ensure normal operation. Furthermore, by pressing the button 712 for a long distance / for an extended period, the intention to unlock is clearly stated, triggering the sensing switch 73. The charging station then directly cuts off the charging circuit, making it impossible to control the charging station to cut off the charging circuit from the charging station itself or the vehicle's infotainment system, thus simplifying the operation.

[0064] Furthermore, a bottom cover 74 is provided on the back of the button part 712, and a spring 75 is provided between the bottom cover 74 and the cavity wall of the receiving cavity 21. Positioning pins 79 for installing the spring 75 are respectively provided on the bottom cover 74 and the cavity wall of the receiving cavity 21.

[0065] Therefore, the locking lever 71 automatically returns to the locked state after the spring force of the spring 75 helps to press the button part 712.

[0066] Optionally, a micro switch 78 is provided in the accommodating cavity 21 and near the locking hook portion 711. The micro switch 78 is used to be triggered when the locking rod 71 is in the locked state and to send a locking signal back to the charging pile.

[0067] Therefore, the position of the locking lever 71 can be detected in real time by the micro switch 78, ensuring that the locking lever 71 moves accurately when locking or unlocking, and timely detection of abnormalities to ensure normal charging status.

[0068] In addition, a cover plate 23 is provided on the handle housing 2. The handle housing 2 and the cover plate 23 are combined to form a receiving cavity 21. The mounting cavity is separated from the receiving cavity 21, thereby isolating the locking rod 71 and related components from the electrical parts in the mounting cavity, avoiding mutual interference, and facilitating inspection and maintenance. The cover plate 23 has a through hole for exposing the button part 712.

[0069] Specific usage process: After the national standard liquid-cooled DC charging gun is reliably connected to the vehicle charging port, the charging pile supplies power to the electromagnet 76. The electromagnet 76 generates magnetic force, which tightly attracts the armature 77 on the locking rod 71. The locking hook 711 is pressed down to maintain the locked state, and at this time the button 712 cannot be pressed normally.

[0070] When it is necessary to stop charging and unlock the charging gun, press the button 712 continuously. After the soft rubber layer 72 is pressed to the set stroke / set time, the sensing switch 73 is triggered. The sensing switch 73 sends a signal to the charging pile. After the charging pile reduces the voltage and current to a safe range, it disconnects the power supply to the electromagnet 76. The magnetic force of the electromagnet 76 disappears, and the button 712 can be pressed. By pressing the button 712 to overcome the elastic force of the spring 75, the locking hook 711 is lifted, realizing the unlocking function. When the button 712 is released, under the reset action of the spring 75, the button 712 is lifted, the locking hook 711 is lowered, and the electromagnet 76 is powered on again to restore the locking function.

[0071] Specifically, the sensing switch 73 is linked with the button part 712. When the button part 712 is pressed down, the sensing switch 73 sends a signal to the charging pile to cut off the charging circuit, giving the charging system time to reduce voltage and current, and also has a certain emergency stopping charging function.

[0072] Optionally, the locking assembly 8 includes a sealing ring 81, a circular claw 82, and a claw fixing ring 83 sequentially sleeved on the liquid-cooled cable 3. One side of the circular claw 82 abuts against the sealing ring 81, and a plurality of annularly distributed claw arms are provided on the other side of the circular claw 82. The claw arms extend along the axial direction of the liquid-cooled cable 3, and the claw fixing ring 83 is sleeved on each claw arm and applies radial force to the claw arm, so that the circular claw 82 grips the liquid-cooled cable 3 tightly.

[0073] Furthermore, the locking assembly 8 also includes a tail cap 84 and a cable protector 85. The tail cap 84 is fixedly connected to the tail end port of the handle housing 2 and seals the sealing ring 81, the circular claw 82 and the claw fixing ring 83 in the mounting cavity. The tail cap 84 has a through hole for the liquid-cooled cable 3 to pass through. The cable protector 85 is fitted on the liquid-cooled cable 3 and is in sealed contact with the hole wall of the through hole.

[0074] Thus, the locking structure composed of sealing ring 81, circular claw 82, claw fixing ring 83, tail cap 84 and cable protection sleeve 85 improves the sealing and protection between handle housing 2 and liquid-cooled cable 3, and ensures that the liquid-cooled cable 3 will not loosen during use, thus guaranteeing a reliable electrical connection.

[0075] Specifically, the protective sleeve 85 has a pressing edge that is squeezed into the perforation.

[0076] This allows the cable protector 85 and the tail cap 84 to snap together. After the tail cap 84 is fixed on the handle housing 2, the cable protector 85 is also locked in place. The pressing edge can fill the gap between the perforation and the liquid-cooled cable 3, preventing moisture and dust from entering.

[0077] In summary, this national standard liquid-cooled DC charging gun has the following advantages:

[0078] 1) A liquid cooling path was added to the existing charging gun and cable, and a water-coated copper (liquid cooling pipe 31 is sleeved outside the power conductor 32) scheme was adopted. The outer diameter of the liquid-cooled cable 3 can be greatly reduced, which solves the problems of heavy weight and difficulty in bending of high-power charging gun cables, as well as the difficulties in operation and storage. At the same time, the bending radius is reduced, and the welding part of DC terminal 6 and power conductor 32 is set in the cooling cavity, which improves the liquid cooling heat dissipation efficiency, reduces the weight of the cable, and makes it more convenient to operate.

[0079] 2) The locking assembly 7 is equipped with a sensing switch 73. When the button part 712 is pressed to unlock, a signal can be sent to the charging pile to cut off the charging circuit. No additional operation is required to control the charging pile to cut off the charging circuit, making the unlocking process faster and more convenient, avoiding the situation of pulling out the gun while it is powered on, and reducing the occurrence rate of accidents.

[0080] 3) The design of multiple sealing rings ensures the sealing of the cooling chamber and the mounting chamber, improves the protection level, and reduces the risk of leakage. In particular, the locking wire assembly 8 makes the fit between the liquid cooling cable 3 and the tail of the handle housing 2 more reliable.

[0081] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A national standard liquid-cooled DC charging gun, characterized in that, The device includes a gun head housing (1), a handle housing (2), and a liquid-cooled cable (3). The head end of the gun head housing (1) and the handle housing (2) are combined to form an installation cavity. The liquid-cooled cable (3) extends from the tail end of the handle housing (2) into the installation cavity. The installation cavity is provided with a liner (4) and a gun head nozzle (5). The liner (4) and the gun head nozzle (5) are combined to form a cooling cavity. The gun head housing (1) is provided with a DC terminal (6) extending into the cooling cavity. The liquid-cooled cable (3) is provided with a liquid-cooled tube (31). A power conductor (32) is passed through the liquid-cooled tube (31) and filled with coolant. The liquid-cooled tube (31) is connected to the gun head nozzle (5), and the power conductor (32) passes through the gun head nozzle (5) and is welded to the DC terminal (6) in the cooling cavity to form a charging circuit. The handle housing (2) is provided with a locking component (7), which is used to lock with the vehicle charging port to lock the national standard liquid-cooled DC charging gun with the vehicle charging port, and is used to automatically send a signal to the charging pile to cut off the charging circuit before operation and unlocking of the vehicle charging port. A locking assembly (8) is provided between the liquid cooling cable (3) and the handle housing (2). The locking assembly (8) is used to fix the liquid cooling cable (3) and seal the tail end of the handle housing (2).

2. The GB liquid-cooled DC charging gun according to claim 1, characterized in that, The inner liner (4) is fixedly connected to the gun head housing (1), and a positioning buckle (61) is sandwiched between the inner liner (4) and the gun head housing (1). The surface of the DC terminal (6) is provided with a slot that engages with the positioning buckle (61). A first sealing ring (62) that is in close contact with the inner liner (4) is provided on the DC terminal (6) and on one side of the slot. A second sealing ring (63) that is in close contact with the gun head housing (1) is provided on the DC terminal (6) and on the other side of the slot.

3. The GB liquid-cooled DC charging gun according to claim 1, characterized in that, The nozzle (5) is fixed to the liner (4) by bolts. One end of the nozzle (5) extends into the liner (4) and is provided with a third sealing ring (51) that is in close contact with the liner (4). The other end of the nozzle (5) is provided with a pagoda connector (52) that is interference fit with the liquid cooling pipe (31). The liquid cooling pipe (31) is provided with a clamp for tightening the liquid cooling pipe (31) and the pagoda connector (52).

4. The GB liquid-cooled DC charging gun of claim 1, wherein, A leakage sensor is installed inside the mounting cavity and below the cooling cavity. The leakage sensor is used to monitor whether the coolant is leaking.

5. The GB liquid-cooled DC charging gun according to claim 1, characterized in that, The locking assembly (7) includes a locking rod (71), a receiving cavity (21) is provided inside the handle housing (2), a support seat (22) is provided on the cavity wall of the receiving cavity (21), the middle part of the locking rod (71) is rotatably connected to the support seat (22), one end of the locking rod (71) extends out of the handle housing (2) and forms a locking hook (711), and the other end of the locking rod (71) protrudes from the surface of the handle housing (2) and forms a button (712); An electromagnet (76) is provided in the accommodating cavity (21) and near the locking hook (711). An armature (77) cooperating with the electromagnet (76) is provided on the locking rod (71). The electromagnet (76) is used to attract the armature (77) when energized, so that the locking rod (71) remains locked and the button (712) cannot drive the locking rod (71). The surface of the button part (712) is provided with a soft rubber layer (72), and a cavity is provided below the soft rubber layer (72). A sensing switch (73) is provided in the cavity. The sensing switch (73) is triggered after the button part (712) is pressed and the soft rubber layer (72) is deformed by pressing. The sensing switch (73) is used to send a signal to the charging pile to cut off the charging circuit and de-energize the electromagnet (76) after being triggered, so that the button part (712) can drive the locking rod (71) to unlock.

6. The GB liquid-cooled DC charging gun according to claim 5, characterized in that, There is a gap between the sensing switch (73) and the soft rubber layer (72), so that the sensing switch (73) can only be triggered after the soft rubber layer (72) is pressed for a set distance; And / or, the soft rubber layer (72) is pressed and deformed and continues to contact the sensing switch (73) for a set time before the sensing switch (73) can be triggered.

7. The GB liquid-cooled DC charging gun according to claim 5, characterized in that, A bottom cover (74) is provided on the back of the button part (712). A spring (75) is provided between the bottom cover (74) and the cavity wall of the receiving cavity (21). Positioning pins (79) for installing the spring (75) are respectively provided on the bottom cover (74) and the cavity wall of the receiving cavity (21).

8. The GB liquid-cooled DC charging gun of claim 5, wherein, A micro switch (78) is provided in the accommodating cavity (21) and near the locking hook (711). The micro switch (78) is used to be triggered when the locking rod (71) is in the locked state and to send a locking signal back to the charging pile.

9. The GB liquid-cooled DC charging gun of claim 1, wherein, The locking assembly (8) includes a sealing ring (81), a circular claw (82), and a claw fixing ring (83) sequentially sleeved on the liquid-cooled cable (3). One side of the circular claw (82) abuts against the sealing ring (81), and a plurality of annularly distributed claw arms are provided on the other side of the circular claw (82). The claw arms extend along the axial direction of the liquid-cooled cable (3), and the claw fixing ring (83) is sleeved on each of the claw arms and applies a radial force to the claw arms, so that the circular claw (82) grips the liquid-cooled cable (3).

10. The GB liquid-cooled DC charging gun according to claim 9, characterized in that, The locking assembly (8) also includes a tail cap (84) and a cable protector (85). The tail cap (84) is fixedly connected to the tail end port of the handle housing (2) and seals the sealing ring (81), the circular claw (82) and the claw fixing ring (83) in the mounting cavity. The tail cap (84) has a through hole for the liquid-cooled cable (3) to pass through. The cable protector (85) is fitted on the liquid-cooled cable (3) and is in sealed contact with the hole wall of the through hole.

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