A liquid-cooled charging gun terminal rubber encapsulation sealing structure

Abstract

The present invention provides a liquid-cooled charging gun terminal rubber-encapsulated sealing structure, comprising a shell and a conductor, a transparent installation channel is horizontally provided in the middle of the shell, the conductor is arranged in the installation channel, and a conductive structure connected to the charging pile and a connecting end for connecting to the charging gun line are respectively provided on both sides of the shell, and the connecting end and the conductive structure are both connected to the conductor, a heat exchange cavity for containing heat exchange liquid is provided in the shell, joints are provided on both sides of the shell, and through holes connected to the heat exchange cavity are provided on the joints, the two joints are respectively connected to two liquid cooling pipes, and the liquid cooling pipes are connected to the heat exchange cavity through the joints, and the two liquid cooling pipes are respectively used for conveying heat exchange liquid to the heat exchange cavity and discharging the heat exchange liquid in the heat exchange cavity from the heat exchange cavity, so as to solve the problem that the temperature of the conductor at the tail of the charging gun will increase when charging with a large current, and long-term operation at high temperature will cause the material of the charging gun shell here to age, reduce the service life, and even cause safety problems.

Description

Technical Field

[0001] The present invention relates to the technical field of charging guns, and in particular to a rubber-encapsulated sealing structure for liquid-cooled charging gun terminals. Background Art

[0002] With the development of science and technology, the number of electric vehicles is growing faster and faster in order to reduce carbon dioxide emissions and air pollution, reduce dependence on fossil fuels, and reduce operating costs and refueling costs. Charging issues have become the most concerned issue for more and more electric vehicle owners.

[0003] There are two types of charging: fast charging (DC charging) and slow charging (AC charging). In households with AC charging piles, the use of AC slow charging is acceptable, but China's urbanization has only developed rapidly in recent decades, and a large number of people who have moved from rural areas to cities do not have the conditions to own their own charging piles, so this part of the population, taxis, rental cars, and long-distance electric vehicles are eager to quickly replenish electricity.

[0004] In order to shorten the time of a single charge for users and solve their charging anxiety, the development of high-power charging technology has become a consensus in the industry. At the current stage, increasing the charging current is the mainstream solution for developing high-power charging. When the charging current increases, the heat of the charging gun increases sharply. To solve this problem, the traditional way is to increase the cross-sectional area of ​​the conductor, but the excessive cross-sectional area makes it difficult to operate. Therefore, liquid cooling is used to force cooling of the charging gun pins so that smaller conductors can carry larger currents. The charging gun pins and the charging seat sockets heat up seriously due to the existence of contact resistance. Therefore, the existing high-power charging guns all cool the internal pins of the charging guns. The existing liquid-cooled charging gun patents do not have a liquid cooling design for the tail conductor. However, due to the connection resistance between the conductor and the cable, and the connection resistance between the conductor and the charging pile, the temperature rise at this position will be very high when charging with high current. Long-term operation at high temperatures will cause the material here to age, reduce the service life, and even cause safety problems. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid-cooled charging gun terminal rubber-encapsulated sealing structure to solve the problem that the temperature of the conductor at the tail of the charging gun will rise when charging with a large current. Long-term operation at high temperature will cause aging of the charging gun shell material here, reduce the service life, and even cause safety problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A liquid-cooled charging gun terminal rubber-encapsulated sealing structure comprises a shell and a conductor, a transparent installation channel is transversely provided in the middle of the shell, the conductor is arranged in the installation channel, and the two sides of the shell are respectively provided with a conductive structure connected to the charging pile and a connecting end for connecting to the charging gun line, the connecting end and the conductive structure are both connected to the conductor, a heat exchange cavity for containing heat exchange liquid is provided in the shell, joints are provided on both sides of the shell, and through holes connected to the heat exchange cavity are provided on the joints, the two joints are respectively connected to two liquid cooling pipes, and the liquid cooling pipes are connected to the heat exchange cavity through the joints, and the two liquid cooling pipes are respectively used to transport heat exchange liquid to the heat exchange cavity and discharge the heat exchange liquid in the heat exchange cavity out of the heat exchange cavity.

[0008] A further technical solution is that the shell includes an upper shell and a lower shell, the upper shell is provided with a first channel and a first annular groove, the lower shell is provided with a second channel and a second annular groove, the first channel and the second channel together form an installation channel, the first annular groove and the second annular groove together form a heat exchange cavity, and the ends of the upper shell and the lower shell away from each other are respectively provided with a first infusion channel connected to the first annular groove and a second infusion channel connected to the second annular groove.

[0009] A further technical solution is that the first channel and the first annular groove are separated by a first annular plate arranged in the first shell, and the second channel and the second annular groove are separated by a second annular plate arranged in the second shell, the second annular plate extends into the first channel at one end away from the second shell and is connected to the first annular plate, a first annular channel is provided on the side of the first annular plate facing the first channel, and a second annular channel is provided on the side of the second annular plate facing the second annular groove, and the first annular channel and the second annular channel together form a sealing channel, and a sealing ring is provided in the sealing channel.

[0010] A further technical solution is that threads are provided on the outer side of the joint, and a fixing nut is threadedly connected to the connection between the joint and the liquid cooling pipe.

[0011] A further technical solution is that the conductor is cylindrical and fits tightly with the installation channel.

[0012] A further technical solution is that the lower shell and the second annular plate are both made of heat-conducting insulating materials, and the lower shell, the second annular plate and the conductor are integrally formed.

[0013] A further technical solution is that the heat exchange liquid is a conductive heat exchange liquid or a non-conductive heat exchange liquid.

[0014] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0015] 1. During operation, the conductor generates heat and exchanges heat through the coolant, which reduces the temperature rise of the conductor and allows the conductor to carry a larger current.

[0016] 2. The conductor and the shell are assembled together, allowing the conductor, the conductive structure and the connecting wire to be connected before assembly, which reduces the difficulty of production and improves production efficiency. At the same time, it can avoid the adverse effects of high temperature and vibration on the thermal conductive material caused by the connection between the conductive structure and the connecting wire and the conductor.

[0017] 3. Under high temperature conditions, the working liquid cooling pipe may become soft and cause danger of falling off from the joint. The fixing nut can securely fix the cooling pipe on the joint to prevent the risk of the liquid cooling pipe and the joint falling off.

[0018] 4. The liquid cooling pipe is connected to the heat exchange cavity through a joint, and the two liquid cooling pipes are respectively used to transport heat exchange liquid to the heat exchange cavity and discharge the heat exchange liquid in the heat exchange cavity out of the heat exchange cavity, ensuring that the heat exchange liquid in the heat exchange cavity flows continuously. The flowing heat exchange liquid keeps the heat exchange liquid in the heat exchange cavity in an optimal working state at all times, thereby achieving physical cooling of the conductive structure and the connecting wires.

[0019] 5. The lower shell and the second annular plate are both made of heat-conducting and insulating materials, which ensures the thermal conductivity and insulation of the second annular plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a rubber-encapsulated sealing structure for a liquid-cooled charging gun terminal according to the present invention.

[0021] Figure 2 It is a cross-sectional view of the connection between the second annular plate and the conductor in the present invention.

[0022] Icon: 1-shell, 101-upper shell, 102-lower shell, 103-first annular plate, 104-second annular plate, 105-sealing ring, 2-conductor, 201-conductive structure, 202-connecting end, 3-installation channel, 301-first channel, 302-second channel, 4-heat exchange cavity, 401-first annular groove, 402-second annular groove, 5-connector, 6-liquid cooling pipe, 7-fixing nut. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Example:

[0025] Figure 1-2A preferred embodiment of a rubber-encapsulated sealing structure for a liquid-cooled charging gun terminal of the present invention is shown. The liquid-cooled charging gun terminal in this embodiment includes a shell 1 and a conductor 2. A transparent installation channel 3 is laterally provided in the middle of the shell 1. The conductor 2 is arranged in the installation channel 3. A conductive structure 201 connected to the charging pile and a connecting end 202 for connecting to the charging gun line are respectively provided on both sides of the shell 1. The connecting end 202 and the conductive structure 201 are both connected to the conductor 2. A heat exchange cavity 4 for containing heat exchange liquid is provided in the shell 1. Joints 5 are provided on both sides of the shell 1. Through holes connected to the heat exchange cavity 4 are provided on the joints 5. The two joints 5 are respectively connected to two liquid cooling pipes 6, and the liquid cooling pipes 6 are connected to the heat exchange cavity 4 through the joints 5. The two liquid cooling pipes 6 are respectively used to transport heat exchange liquid to the heat exchange cavity 4 and discharge the heat exchange liquid in the heat exchange cavity 4 out of the heat exchange cavity 4.

[0026] In the present invention, a liquid cooling pipe 6 transports cooled heat exchange liquid into the heat exchange cavity 4, and another liquid cooling pipe 6 discharges the high-temperature heat exchange liquid after heat exchange in the heat exchange cavity 4 out of the heat exchange cavity 4. Specifically, the high-temperature heat exchange liquid flowing out of the heat exchange cavity 4 through the liquid cooling pipe 6 flows into the oil tank for cooling, and the cooled heat exchange liquid flows into the heat exchange cavity 4 again, thereby realizing the recycling of the heat exchange liquid, so that the heat exchange liquid in the heat exchange cavity 4 is continuously replenished and discharged, and the heat exchange liquid is provided to absorb the heat emitted by the conductor 2 to achieve cooling of the conductor 2, thereby ensuring that the conductor 2 is in a safe and stable working environment.

[0027] The reason why the conductor 2 heats up is because there is a connection resistance at the connection between the conductor 2 and the connecting wire 202 connected to the charging gun, and the connection resistance between the conductive structure 201 and the charging pile. When charging with a large current, the temperature rise at this position will be very high. Working at high temperature for a long time will cause the material here to age, reduce the service life, and even cause safety problems. This situation can be avoided by using heat exchange liquid to cool the conductor 2.

[0028] The charging gun generates heat due to the presence of resistance when in use. The connection end 202 of the conductor 2 at the tail of the charging gun is connected to the charging gun cable, and the connection method is usually crimping or ultrasonic welding. When connected, a connection resistance R1 is formed. The conductive structure 201 is connected to the charging pile at the other end, and the connection method is usually bolt connection, thereby forming another connection resistance R2. The conductive structure 201 itself has resistance R. Therefore, its total resistance Rtotal = R1+R2+R, and the temperature rise here is very high during charging. This patent designs a liquid cooling structure at the conductor 2, and the heat generated by the conductor 2 during charging is transferred to the heat exchange liquid through the thermal conductivity of the thermal conductive material, thereby reducing the temperature of the conductor 2 during charging, thereby allowing the conductor 2 to carry a larger current.

[0029] The conductive structure 201 is used to connect the conductor 2 and the charging pile, and the connecting end 202 is a connecting wire used to connect the conductor 2 and the charging gun.

[0030] As another embodiment of the present invention, the shell 1 includes an upper shell 101 and a lower shell 102, the upper shell 101 is provided with a first channel 301 and a first annular groove 401, the lower shell 102 is provided with a second channel 302 and a second annular groove 402, the first channel 301 and the second channel 302 jointly form an installation channel 3, the first annular groove 401 and the second annular groove 402 jointly form a heat exchange cavity 4, the ends of the upper shell 101 and the lower shell 102 away from each other are respectively provided with a first infusion channel connected to the first annular groove 401 and a second infusion channel connected to the second annular groove 402, the first annular groove 401 and the second annular groove 402 jointly form a closed heat exchange cavity 4, and the heat exchange cavity 4 is isolated from the installation channel 3 to prevent the liquid in the heat exchange cavity 4 from flowing into the installation channel 3.

[0031] The first channel 301 and the first annular groove 401 are separated by a first annular plate 103 arranged in the first shell 1, and the second channel 302 and the second annular groove 402 are separated by a second annular plate 104 arranged in the second shell 1. The second annular plate 104 extends from the end of the second shell 1 into the first channel 301 and is connected to the first annular plate 103. The first annular plate 103 is provided with a first annular channel on the side facing the first channel 301, and the second annular plate 104 is provided with a second annular channel on the side facing the second annular groove 402. The first annular channel and the second annular channel jointly form a sealing channel, and a sealing ring 105 is provided in the sealing channel. The sealing ring 105 is provided to prevent the heat exchange liquid in the heat exchange cavity 4 from flowing from the connection between the first annular plate 103 and the second annular plate 104 into the installation channel 3.

[0032] The outer side of the joint 5 is provided with a thread, and the joint 5 and the liquid cooling pipe 6 are connected with a fixing nut 7 threadedly. The fixing nut 7 is used to fix the connection between the liquid cooling pipe 6 and the joint 5 to prevent the liquid cooling pipe 6 from being separated from the joint 5 during use, and the connection or separation of the liquid cooling pipe 6 and the joint 5 is achieved by rotating the fixing nut 7.

[0033] The conductor 2 is cylindrical and fits tightly with the mounting channel 3, so that the shell 1 and the conductor 2 fit tightly, which is convenient for heat conduction through the second annular plate 104, so that the heat exchange liquid in the heat exchange cavity 4 can continuously absorb the heat of the second annular plate 104 as a heat conduction medium, thereby achieving cooling of the conductor 2.

[0034] The lower shell 102 and the second annular plate 104 are both made of thermally conductive insulating materials, ensuring the thermal conductivity and insulation of the second annular plate 104 and the lower shell 102. The lower shell 102, the second annular plate 104 and the conductor 2 are integrally formed to make the entire lower shell 102 stable. The lower shell 102 and the second annular plate 104 are both made of thermally conductive insulating materials, which is convenient for quickly absorbing the heat emitted by the conductor 2 when working.

[0035] The heat exchange liquid is a conductive heat exchange liquid or a non-conductive heat exchange liquid. Specifically, the heat exchange liquid can be an ethylene glycol solution. The ethylene glycol solution has the advantages of low cost and high heat exchange power, and has been widely used in fields such as engine coolant, thus becoming one of the mainstream cooling media.

[0036] When a non-conductive heat exchange liquid is used as the coolant heat exchange liquid, such as silicone oil, the lower shell 102 does not use a thermally conductive insulating material, and the coolant heat exchange liquid and the conductor 2 are in direct contact to achieve a liquid cooling effect.

[0037] In the present invention, the joint 5 is made of non-metallic material and is formed by a mold. Its reliability is not as good as that of the solution in this patent, but its cooling effect can achieve the effect described in this patent.

[0038] like Figure 1 The arrangement position of the connector 5 shown has a better effect. The connector 5 can be arranged at different positions to achieve a certain liquid cooling effect, such as two connectors 5 are arranged at the same end of the housing 1.

[0039] In the present invention, the conductor 2 is a copper busbar.

[0040] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A liquid-cooled charging gun terminal rubber encapsulation sealing structure, characterized in that: The invention comprises a shell (1) and a conductor (2), wherein a transparent installation channel (3) is transversely provided in the middle of the shell (1), and the conductor (2) is arranged in the installation channel (3). Both sides of the shell (1) are provided with a conductive structure (201) connected to a charging pile and a connection end (202) for connecting to a charging gun line, respectively, and the connection end (202) and the conductive structure (201) are both connected to the conductor (2), and the shell (1) is provided with a connection end (202) for accommodating replacement. A heat exchange cavity (4) for hot liquid, joints (5) are provided on both sides of the shell (1), and the joints (5) are provided with through holes connected to the heat exchange cavity (4), the two joints (5) are respectively connected to two liquid cooling pipes (6), and the liquid cooling pipes (6) are connected to the heat exchange cavity (4) through the joints (5), and the two liquid cooling pipes (6) are respectively used to transport heat exchange liquid to the heat exchange cavity (4) and discharge the heat exchange liquid in the heat exchange cavity (4) out of the heat exchange cavity (4); The housing (1) comprises an upper shell (101) and a lower shell (102); a first channel (301) and a first annular groove (401) are provided in the upper shell (101); a second channel (302) and a second annular groove (402) are provided in the lower shell (102); the first channel (301) and the second channel (302) together form a mounting channel (3); the first annular groove (401) and the second annular groove (402) together form a heat exchange cavity (4); and a first infusion channel connected to the first annular groove (401) and a second infusion channel connected to the second annular groove (402) are respectively provided at ends of the upper shell (101) and the lower shell (102) that are away from each other.

2. According to claim 1, a liquid-cooled charging gun terminal rubber encapsulation sealing structure is characterized in that: The first channel (301) and the first annular groove (401) are separated by a first annular plate (103) arranged in the first shell (1); the second channel (302) and the second annular groove (402) are separated by a second annular plate (104) arranged in the second shell (1); one end of the second annular plate (104) away from the second shell (1) extends into the first channel (301) and is connected to the first annular plate (103); a first annular channel is provided on a side of the first annular plate (103) facing the first channel (301); a second annular channel is provided on a side of the second annular plate (104) facing the second annular groove (402); the first annular channel and the second annular channel together form a sealing channel; a sealing ring (105) is provided in the sealing channel.

3. According to claim 1, a liquid-cooled charging gun terminal rubber encapsulation sealing structure is characterized in that: The outer side of the joint (5) is provided with threads, and a fixing nut (7) is threadedly connected at the connection point between the joint (5) and the liquid cooling pipe (6).

4. The liquid-cooled charging gun terminal rubber-encapsulated sealing structure according to claim 1, characterized in that: The conductor (2) is cylindrical, and the conductor (2) fits tightly with the installation channel (3).

5. The liquid-cooled charging gun terminal rubber-encapsulated sealing structure according to claim 2, characterized in that: The lower shell (102) and the second annular plate (104) are both made of heat-conducting insulating materials, and the lower shell (102), the second annular plate (104) and the conductor (2) are integrally formed.

6. The liquid-cooled charging gun terminal rubber-encapsulated sealing structure according to claim 1, characterized in that: The heat exchange liquid is a conductive heat exchange liquid or a non-conductive heat exchange liquid.

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