A liquid-cooled cable for a new energy electric vehicle charging socket

Abstract

A liquid-cooled cable for a new energy electric vehicle charging socket includes a socket housing and two liquid-cooled jacks DC+ and DC- arranged in the socket housing, as well as a number of signal lines. It also includes two liquid-cooled electrodes for connecting to the DC+ and DC- poles of a vehicle-mounted battery pack, and two liquid-cooled cables respectively connected between the DC+ liquid-cooled jack and the DC+ liquid-cooled electrode, and between the DC- liquid-cooled jack and the DC- liquid-cooled electrode. The liquid-cooled cable includes a soft conductor for conducting electricity, and an inner channel for cooling the soft conductor and an outer channel for cooling the cooling liquid; the ends of the inner channel for cooling the cooling liquid and the outer channel for cooling the cooling liquid connected to the liquid-cooled electrode are respectively connected to the liquid inlet and the liquid outlet, and the end connected to the liquid-cooled jack is connected to the connecting cavity. The present invention increases the current carried by the charging cable from the existing 250A to 600A without increasing the diameter of the existing cable, and can ensure that the temperature rise of the charging cable is within a controllable range. At the same time, it meets the user's requirements for the charging time of electric vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to a liquid-cooled cable for a charging socket of a new energy electric vehicle. Background Art

[0002] New energy electric vehicles have developed rapidly because they have no exhaust emissions and do not pollute the environment. At present, there are two main factors restricting the development of new energy electric vehicles: one is the short battery life; the other is the long charging time. Taking the charging of electric buses as an example, the current maximum power charging pile is a medium-power DC charging pile, its charging voltage is 750 volts DC, and the maximum output charging current is 250A DC. In theory, it takes at least 2 to 3 hours to charge an electric bus and fully charge the battery of the electric bus. However, since the charging socket on the electric vehicle is usually installed on the body shell, and the battery pack is placed in the body, two 70 square millimeter dry cables connect the socket and the battery pack. Due to the narrow wiring space of the dry cable and poor heat dissipation, the user feedback is that when the current reaches 250A, the heat generated by the conductive jack and the soft wire cannot be dissipated well, causing the cable temperature to be too high. In order to avoid accidents caused by overheating of the cable, the actual charging current is usually controlled below 180A, resulting in the actual charging time of the electric bus being longer than the theoretical charging time.

[0003] The patent application number is CN201810249723.3, which discloses a DC+ and DC- parallel cooling liquid-cooled cable for high-power charging piles. Its characteristics are that the outer diameter of the cable is the same as the outer diameter of the dry integrated cable used for medium-power DC charging piles. The technical solution adopted is to reduce the cross-sectional area of ​​the soft conductor of the dry integrated cable used for medium-power DC charging piles. The cross-sectional area of ​​the soft conductor of the dry integrated cable used for medium-power DC charging piles is 70 square millimeters, while the cross-sectional area of ​​the soft conductor of the liquid-cooled cable is 35 square millimeters. The saved space is used as a channel for the coolant, and the circulating coolant is introduced into the gap of the soft conductor. The coolant takes away the heat generated by the conductor during the charging process, which can greatly improve the current carrying capacity of the charging cable. The maximum current carried by the 70 square millimeter dry cable is 250A. After adopting liquid cooling technology, the 35 square millimeter liquid-cooled cable can carry 600A current and can work safely and reliably for a long time. The high-power DC charging piles currently being developed in China can output 1000 volts, 400A to 600A of DC power. Using high-power charging piles to charge electric buses, it only takes 30 minutes to fully charge the battery pack.

[0004] Using high-power DC charging piles to charge new energy electric vehicles can effectively alleviate the bottleneck problem of the long charging time of new energy electric vehicles, but this is also a systematic project. Although there are liquid-cooled cables and liquid-cooled charging guns dedicated to high-power charging piles, new energy electric vehicles must be equipped with high-power charging sockets that can be matched with high-power DC liquid-cooled charging guns to achieve this. If new energy electric vehicles still use 250A medium-power sockets, 70 square millimeters dry cables and dry conductive jacks, during the charging process, if the charging current is greater than 250A, the heat generated by the cables cannot be dissipated well, which will cause accidents due to overheating, and in severe cases, fires will be caused and the vehicle will be burned. Therefore, the rapid development of new energy electric vehicles urgently needs a high-power dedicated charging socket that can be used on new energy electric vehicles. Summary of the invention

[0005] In order to overcome the shortcomings in the background technology, the present invention discloses a liquid-cooled cable for a new energy electric vehicle charging socket, which can increase the charging voltage carried by the charging cable from the existing 750V to 1000V and the charging current from the existing 250A to 600A without increasing the diameter of the existing cable, and can ensure that the temperature rise of the charging cable is within a controllable range, thereby ensuring safe charging of the electric vehicle and long-term reliable operation.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0007] A liquid-cooled cable for a new energy electric vehicle charging socket, comprising:

[0008] A socket housing, two liquid cooling jacks DC+ and DC- arranged in the socket housing, and a plurality of signal lines; the liquid cooling jacks are provided with a communication cavity.

[0009] It also includes two liquid-cooled electrodes for connecting to the DC+ and DC- poles of the vehicle-mounted battery pack: the liquid-cooled electrodes are provided with a liquid inlet and a liquid outlet for the cooling liquid to enter and exit.

[0010] And, two liquid-cooling cables respectively connected between the DC+ liquid-cooling jack and the DC+ liquid-cooling electrode, and between the DC- liquid-cooling jack and the DC- liquid-cooling electrode; the liquid-cooling cable includes an insulating sleeve, a soft wire is passed through the insulating sleeve, and an inner cooling liquid channel along the soft wire from the liquid-cooling electrode to the liquid-cooling jack, and an outer cooling liquid channel along the soft wire from the liquid-cooling jack to the liquid-cooling electrode is also provided; one end of the inner cooling liquid channel and the outer cooling liquid channel connected to the liquid-cooling electrode are respectively connected to the liquid inlet and the liquid outlet, and the other end connected to the liquid-cooling jack is connected to the connecting cavity.

[0011] Preferably, the cavity between the edge sleeve and the soft wire is an external cooling liquid channel, and the end of the external cooling liquid channel connected to the liquid-cooled electrode is communicated with the liquid outlet, and the end connected to the liquid-cooled socket is communicated with the connecting cavity; the soft wire is a hollow soft wire, and a cooling liquid inner tube is provided inside, and the inner cavity of the cooling liquid inner tube is the cooling liquid inner channel, and the end of the cooling liquid inner channel connected to the liquid-cooled electrode is communicated with the liquid inlet, and the end connected to the liquid-cooled socket is communicated with the connecting cavity.

[0012] Preferably, the liquid cooling socket is shaft-shaped, with one end being a socket end corresponding to the charging gun terminal, and the other end being a connecting end connected to the liquid cooling cable. A connecting cavity is provided on the end face of the connecting end, a soft wire is crimped on the upper semicircle of the inner wall of the connecting cavity, and an insulating sleeve is sleeved on the outer cylindrical surface of the connecting end.

[0013] Preferably, the communicating cavity extends toward the jack end and is enclosed within an outer wall of the jack at the jack end.

[0014] Preferably, an annular diverter sleeve is provided in the connecting cavity, which divides the connecting cavity into two inner and outer cavities, wherein the inner cavity is connected to the inner channel of the coolant, and the outer cavity is connected to the outer channel of the coolant, and the inner cavity and the outer cavity are connected at the connecting cavity near the socket end.

[0015] Preferably, the inner cavity is sealedly connected with a plug-in conduit near the connection end, the outer diameter of the plug-in conduit is smaller than the inner diameter of the connecting cavity, the plug-in conduit extends outward from the connection end, and is plugged into the coolant inner tube.

[0016] Preferably, the liquid-cooled electrode is composed of two parts: the front part of the cone head and the tail part of the cone hole; the front part of the cone head is a shaft-shaped body with an outer cone surface at one end, the end with the outer cone surface is provided with a through hole, the other end is an electrode pipeline connected with the through hole, and a liquid outlet is provided on the tube wall of the electrode pipeline; the tail part of the cone hole is a shaft-shaped body, one end of which is provided with an inner cone surface corresponding to the end of the front part of the cone head with the outer cone surface, a countersunk hole corresponding to the through hole, and a liquid inlet is provided on the hole wall of the countersunk hole; the outer cone surface of the front part of the cone head fits with the inner cone surface of the tail part of the cone hole, and is screwed together The invention relates to a method for manufacturing a plurality of cooling devices for the cooling device of the present invention. The cooling device comprises a plurality of cooling devices, a plurality of cooling devices and a plurality of cooling devices ...

[0017] Preferably, the liquid-cooled electrode is composed of two parts, the front part of the conical hole and the rear part of the conical head; the front part of the conical hole is an axial body with an inner conical surface at one end, the end with the inner conical surface is provided with a through hole, the other end is an electrode pipeline connected with the through hole, and a liquid outlet is provided on the tube wall of the electrode pipeline; the rear part of the conical head is an axial body, one end of which is provided with an outer conical surface corresponding to the end with the inner conical surface of the front part of the conical hole, a countersunk hole corresponding to the through hole, and a liquid inlet is provided on the hole wall of the countersunk hole; the inner conical surface of the front part of the conical hole fits with the outer conical surface of the rear part of the conical head, and is screwed together. The invention relates to a method for manufacturing a plurality of cooling devices for the cooling device of the present invention. The cooling device comprises a plurality of cooling devices, a plurality of cooling devices and a plurality of cooling devices. The cooling device comprises ...

[0018] Preferably, the coolant inner tube is a polytetrafluoroethylene tube, and the soft wire includes a soft conductor and a protective copper mesh. The soft conductor is a multi-strand copper wire that is twisted and braided around the outer wall of the polytetrafluoroethylene tube, and the protective copper mesh is a layer of protective mesh with copper wires cross-woven on the outer wall of the soft conductor.

[0019] Due to the adoption of the above technical solution, compared with the background technology, the present invention has the following beneficial effects:

[0020] The present invention provides a high-current charging solution for electric vehicle charging cables by cooling the two DC+ and DC- charging cables in parallel. Without increasing the diameter of the existing charging cable, the charging voltage carried by the liquid-cooled cable with a conductor cross-sectional area of ​​only 35 square millimeters is increased from the existing 750V to 1000V, and the charging current is increased from the existing 250A to 600A. The liquid-cooled cable can be kept within a controllable temperature rise range, thereby ensuring safe charging of the electric vehicle and long-term reliable operation.

[0021] Since the charging power carried by the present invention is greatly improved, the charging time of electric vehicles can be greatly shortened when used in conjunction with a high-power charging pile. The time used is only one-third of the existing medium-power dry-type cable with a conductor cross-sectional area of ​​70 square millimeters, which meets the user's requirements for the charging time of electric vehicles and contributes to the rapid development of new energy electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 Schematic diagram of the structure of the liquid-cooled cable.

[0024] Figure 3 This is a schematic diagram of the structure of the liquid cooling jack.

[0025] Figure 4 for Figure 1 Schematic diagram of the AA cross-section structure.

[0026] Figure 5 Schematic diagram of the structure of DC+liquid-cooled electrode.

[0027] Figure 6 Schematic diagram of the structure of DC-liquid-cooled electrode.

[0028] Figure 7 for Figure 1 Schematic diagram of the BB cross-section structure.

[0029] Figure 8 It is a schematic diagram of the working principle of the present invention.

[0030] Fig. 9 Another structural schematic diagram of DC+liquid-cooled electrode.

[0031] Fig.10 Another structural schematic diagram of a DC-liquid-cooled electrode.

[0032] In the figure: 1. Liquid-cooled jack; 1.1. Connecting cavity; 1.11. Annular flow divider sleeve; 1.12. Inner cavity; 1.13. Outer cavity; 1.2. Socket end; 1.3. Connecting end; 1.4. Socket conduit; 1.5. Crown spring; 2. Liquid-cooled electrode; 2.1. Liquid inlet; 2.2. Liquid outlet; 2.3. Through hole; 2.4. Electrode conduit; 2.5. Counterbore; 2.6. Electrode conduit; 2.7. Sealing ring; 2.8. Connecting pipe; 2.9. Connecting nut; 3. Liquid-cooled cable; 3.1. Coolant inner channel; 3.2. Coolant outer channel; 3.3. Soft wire; 3.4. Coolant inner tube; 3.5. Insulating sleeve; 4. Socket housing; 5. On-board coolant circulation cooling device. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] At present, the country has standard definitions for electric vehicle charging cables and multiple cables in charging sockets. In addition to the DC+ and DC- charging cables, there are also multiple signal cables, communication cables and other weak current cables. The present invention is mainly aimed at the DC+ and DC- charging cables with large charging current and high heat generation.

[0035] Figure 1 The structure diagram of the present invention is shown, which includes a socket housing 4 and two liquid-cooling jacks 1, DC+ and DC-, arranged in the socket housing 4, and two liquid-cooling electrodes 2 connected to the DC+ and DC- poles of the vehicle-mounted battery pack, and two liquid-cooling cables 3 respectively connected between the DC+ liquid-cooling jack 1 and the DC+ liquid-cooling electrode 2, and between the DC- liquid-cooling jack 1 and the DC- liquid-cooling electrode 2. Among them, the liquid-cooling jack 1 is provided with a connecting cavity 1.1, and the liquid-cooling electrode 2 is provided with a liquid inlet 2.1 and a liquid outlet 2.2 for the entry and exit of the cooling liquid. The two liquid-cooling jacks 1, DC+ and DC-, arranged in the electric vehicle charging socket housing 4 are connected to the charging terminals in the high-power DC charging gun.

[0036] like Figure 2 The structure diagram of the liquid-cooling cable is shown, wherein the liquid-cooling cable 3 includes an insulating sleeve 3.5, wherein a soft wire 3.3 is provided through the insulating sleeve 3.5, and an inner cooling liquid channel 3.1 is provided along the soft wire 3.3 from the liquid-cooling electrode 2 to the liquid-cooling socket 1, and an outer cooling liquid channel 3.2 is provided along the soft wire 3.3 from the liquid-cooling socket 1 to the liquid-cooling electrode 2. Cooling liquid is introduced into the inner cooling liquid channel 3.1 and the outer cooling liquid channel 3.2. The "into" here is only for the convenience of expression, and is not a limitation on the direction of the cooling liquid. The cooling liquid in the inner cooling liquid channel 3.1 can also be introduced from the liquid-cooling socket 1 to the liquid-cooling electrode 2 along the soft wire 3.3. Correspondingly, the cooling liquid in the outer cooling liquid channel 3.2 is introduced from the liquid-cooling electrode 2 to the liquid-cooling socket 1 along the soft wire 3.3. In this embodiment, the cavity between the insulating sleeve 3.5 and the soft wire 3.3 is the cooling liquid external channel 3.2, and the end of the cooling liquid external channel 3.2 connected to the liquid cooling electrode 2 is connected to the liquid outlet 2.2, and the end connected to the liquid cooling socket 1 is connected to the connecting cavity 1.1.

[0037] The soft wire 3.3 is a hollow soft wire, and a coolant inner tube 3.4 is provided inside. The inner cavity of the coolant inner tube 3.4 is a coolant inner channel 3.1. The end of the coolant inner channel 3.1 connected to the liquid-cooled electrode 2 is connected to the liquid inlet 2.1, and the end connected to the liquid-cooled socket 1 is connected to the connecting cavity 1.1. It should be understood that the "liquid inlet 2.1" of the liquid-cooled electrode 2 is only for the convenience of description, and does not limit the "liquid inlet 2.1" to the inlet for the coolant to enter the liquid-cooled cable. The "liquid inlet 2.1" can also be understood as the outlet for the coolant to flow out of the liquid-cooled cable. The coolant inner channel 3.1 is connected to the "liquid inlet 2.1", and it does not limit the external coolant to flow into the coolant inner channel 3.1 through the "liquid inlet 2.1". It can also be understood that the coolant in the coolant inner channel 3.1 flows out of the liquid-cooled cable through the "liquid inlet 2.1". Similarly, the "liquid outlet 2.2" of the liquid-cooled electrode 2 is not limited to the outlet for the coolant to flow out of the liquid-cooled cable, and the "liquid outlet 2.2" can also be understood as the inlet for the coolant to enter the liquid-cooled cable. The coolant external channel 3.2 is connected to the "liquid outlet 2.2", which does not limit the coolant in the coolant external channel 3.2 to flow out through the "liquid outlet 2.2", and can also be understood as the coolant entering the coolant external channel 3.2 through the "liquid outlet 2.2".

[0038] In this embodiment, the coolant inner tube 3.4 is a polytetrafluoroethylene tube, and the soft conductor 3.3 includes a soft conductor and a protective copper mesh. The soft conductor is a multi-strand copper wire that is twisted and braided on the outer wall of the polytetrafluoroethylene tube after the copper wires are twisted. The protective copper mesh is a layer of protective mesh that is cross-woven on the outer wall of the soft conductor. The first is to assist in electrical conduction, and the second is to prevent the soft conductor from loosening. The soft conductor 3.3 runs through the coolant inner channel 3.1 and the coolant outer channel 3.2. The soft conductor 3.3 is immersed in the coolant, and the coolant can fully contact the surface of the soft conductor 3.3, which is easy to conduct heat and dissipate heat. The coolant inner tube 3.4 is a high-temperature resistant polytetrafluoroethylene tube, and the polytetrafluoroethylene tube has good chemical stability under high-temperature working environment. The soft conductor 3.3, the coolant inner tube 3.4, and the insulating sleeve 3.5 all have good bending performance, which is convenient for the bending wiring of the liquid cooling cable 3 in the electric vehicle.

[0039] The soft wire 3.3 is a hollow soft wire, and the coolant inner tube 3.4 is arranged inside the soft wire 3.3, that is, the coolant inner channel 3.1 is located inside the coolant outer channel 3.2, and the coolants in the coolant inner channel 3.1 and the coolant outer channel 3.2 are isolated from each other, forming independent coolant inlet and outlet channels.

[0040] Figure 3The structure diagram of the liquid cooling socket is shown. The liquid cooling socket 1 is shaft-shaped, with one end being a socket end 1.2 corresponding to the charging gun terminal, and the other end being a connection end 1.3 connected to the liquid cooling cable 3. A connecting cavity 1.1 is provided on the end face of the connection end 1.3, a soft wire 3.3 is crimped on the semicircle of the inner wall of the connecting cavity 1.1, and an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the connection end 1.3. A socket corresponding to the charging gun terminal is provided on the end face of the socket end 1.2, and a crown spring 1.5 is provided in the socket to clamp the charging gun terminal and establish an electrical connection between the charging gun terminal and the liquid cooling socket 1.

[0041] Patent application number CN201820408462.0 discloses a semicircular crimping method for establishing electrical connection between a soft wire and a liquid cooling terminal, which can achieve reliable electrical connection between the soft wire and the liquid cooling terminal without affecting the connection between the coolant inner tube and the liquid cooling terminal. Figure 1 , 4 As shown, in this embodiment, the soft wire 3.3 is crimped in a semicircular manner on the inner wall of the connecting cavity 1.1, and the non-semicircular crimped cavity in the connecting cavity 1.1 can realize the mutual connection between the connecting cavity 1.1 and the inner channel 3.1 of the cooling liquid and the outer channel 3.2 of the cooling liquid. On the one hand, the semicircular crimping increases the contact area between the soft wire 3.3 and the connecting cavity 1.1, which can withstand a large current. On the other hand, the strong pressure makes the soft wire 3.3 and the liquid cooling socket 1 crimped into one, which can withstand a large axial pulling force. Therefore, the soft wire 3.3 is crimped in a semicircular manner on the inner wall of the connecting cavity 1.1, which can realize a reliable electrical connection between the soft wire 3.3 and the liquid cooling socket 1, and does not affect the mutual connection between the inner channel 3.1 of the cooling liquid and the outer channel 3.2 of the cooling liquid in the liquid cooling socket 1.

[0042] Since the crown spring 1.5 in contact with the charging gun terminal will generate a lot of heat due to poor contact, the connecting cavity 1.1 extends to the jack end 1.2 and is enclosed in the outer wall of the jack end 1.2, which is used to cool the jack end 1.2. Since the coolant in the part of the cavity near the jack end 1.2 of the connecting cavity 1.1 has poor fluidity and poor cooling effect, which affects the cooling of the jack end 1.2, an annular flow divider sleeve 1.11 is provided in the connecting cavity 1.1, and the annular flow divider sleeve 1.11 divides the connecting cavity 1.1 into two cavities, the inner and outer cavities, wherein the inner cavity 1.12 is connected to the inner channel 3.1 of the coolant, and the outer cavity 1.13 is connected to the outer channel 3.2 of the coolant, and the inner cavity 1.12 and the outer cavity 1.13 are connected at the connecting cavity 1.1 near the jack end 1.2. In this way, the coolant in the coolant inner channel 3.1 enters the side of the connecting cavity 1.1 close to the socket end 1.2 through the inner cavity 1.12, and then returns to the coolant outer channel 3.2 from the outer cavity 1.13, thereby achieving flow cooling of the socket end 1.2.

[0043] In order to reduce the processing difficulty of the annular flow divider sleeve 1.11 and facilitate assembly, the inner cavity 1.12 is sealed and connected with a plug-in conduit 1.4 near the connection end 1.3. The outer diameter of the plug-in conduit 1.4 is smaller than the inner diameter of the connecting cavity 1.1, and the plug-in conduit 1.4 extends outward from the connection end 1.3. The coolant inner tube 3.4 located at the end of the liquid cooling socket 1 penetrates the circular twisted copper wire mesh of the soft wire 3.3 and is plugged into the plug-in conduit 1.4, so that the coolant inner channel 3.1 is connected with the inner cavity 1.12.

[0044] One end of the liquid cooling cable for the charging socket of the new energy electric vehicle is connected to the charging socket, and the other end is connected to the vehicle battery pack. In order to facilitate installation and distinguish the positive and negative poles of the DC+ and DC- charging cables corresponding to the vehicle battery pack, the liquid cooling electrode 2 is divided into two parts, namely, a cone head part and a cone hole part. The cone head part and the cone hole part of the liquid cooling electrode 2 of the DC+ and DC- charging cables are different and are not interchangeable.

[0045] Figure 5 The structure diagram of the DC+ liquid-cooled electrode is shown. The DC+ liquid-cooled electrode connected to the DC+ liquid-cooled jack in the charging socket of an electric vehicle and the DC+ pole of the vehicle-mounted battery pack consists of two parts: the front part of the cone head and the tail part of the cone hole; the front part of the cone head is an axial body with an outer cone surface at one end, and the end with the outer cone surface is provided with a through hole 2.3, and the other end is an electrode pipe 2.4 connected to the through hole 2.3, and a liquid outlet 2.2 is provided on the wall of the electrode pipe 2.4; the tail part of the cone hole is an axial body, one end of which is provided with an inner cone surface corresponding to the end of the front part of the cone head with the outer cone surface, and a countersunk hole 2.5 corresponding to the through hole 2.3, and a liquid inlet 2.1 is provided on the hole wall of the countersunk hole 2.5; the outer cone surface of the front part of the cone head is connected to the through hole 2.3, and the through hole 2.3 is connected to the through hole 2.3. The inner conical surface at the tail of the tapered hole fits tightly and is screwed together; a soft wire 3.3 is crimped in a semicircle on the inner tube wall of the electrode pipe 2.4. The structure and principle of the semicircular crimping in the electrode pipe are the same as those in the liquid cooling socket, which will not be repeated here; an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the electrode pipe 2.4, and an electrode conduit 2.6 is inserted in the through hole 2.3. The electrode conduit 2.6 extends out of the electrode pipe 2.4 and is plugged into the coolant inner pipe 3.4. The coolant inner channel 3.1 is connected to the liquid inlet 2.1 through the electrode conduit 2.6 and the countersunk hole 2.5, and the coolant outer channel 3.2 is connected to the liquid outlet 2.2 through the electrode pipe 2.4. The outer tube wall of the electrode pipe 2.4 is also provided with a tooth to prevent the insulating sleeve 3.5 from slipping off. A clamp (not shown) is provided on the insulating sleeve 3.5 to lock with the tooth to ensure the sealing between the insulating sleeve 3.5 and the outer tube wall of the electrode pipe 2.4.

[0046] In order to increase the sealing performance between the front of the cone head and the tail of the cone hole, a sealing groove is provided at one end of the front of the cone head with an outer cone surface, a sealing ring 2.7 is arranged in the sealing groove, and a sealing countersunk hole corresponding to the sealing ring 2.7 is provided at the tail of the cone hole. The front of the cone head and the tail of the cone hole are sealed by the sealing ring 2.7.

[0047] In order to facilitate the connection between the DC+ liquid-cooled electrode and the DC+ pole of the vehicle battery pack, a flat mounting seat is provided at the end of the tapered hole opposite to the tapered hole, and a mounting hole is provided on the mounting seat. The DC+ liquid-cooled electrode is connected to the DC+ pole of the vehicle battery pack through the mounting seat.

[0048] On the contrary, the DC-liquid cooling electrode connected to the DC-liquid cooling jack in the electric vehicle charging socket and the DC-pole of the vehicle battery pack, such as Figure 6 As shown, it consists of two parts, the front part of the cone hole and the rear part of the cone head; the front part of the cone hole is a shaft-shaped body with an inner cone surface at one end, the end with the inner cone surface is provided with a through hole 2.3, and the other end is an electrode pipe 2.4 connected to the through hole 2.3, and a liquid outlet 2.2 is provided on the tube wall of the electrode pipe 2.4; the rear part of the cone head is a shaft-shaped body, one end of which is provided with an outer cone surface corresponding to the end of the front part of the cone hole with the inner cone surface, and a countersunk hole 2.5 corresponding to the through hole 2.3, and a liquid inlet 2.1 is provided on the hole wall of the countersunk hole 2.5; the inner cone surface of the front part of the cone hole and the outer cone surface of the rear part of the cone head are connected to each other. The conical surfaces fit and are screwed together; a soft wire 3.3 is crimped on the semicircle of the inner tube wall of the electrode tube 2.4, an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the electrode tube 2.4, an electrode conduit 2.6 is inserted into the through hole 2.3, the electrode conduit 2.6 extends out of the electrode tube 2.4, and is connected to the coolant inner tube 3.4, the coolant inner channel 3.1 is connected to the liquid inlet 2.1 through the electrode conduit 2.6 and the counterbore 2.5, and the coolant outer channel 3.2 is connected to the liquid outlet 2.2 through the electrode tube 2.4. Horse teeth are also provided on the outer tube wall of the electrode tube 2.4 to prevent the insulating sleeve 3.5 from slipping off, and a clamp (not shown in the figure) is provided on the insulating sleeve 3.5 to lock with the horse teeth to ensure the sealing between the insulating sleeve 3.5 and the outer tube wall of the electrode tube 2.4.

[0049] Similarly, in order to increase the sealing performance between the front of the cone hole and the rear of the cone head, a sealing groove is provided at the end of the rear of the cone head with an outer cone surface, a sealing ring 2.7 is provided in the sealing groove, and a sealing countersunk hole corresponding to the sealing ring 2.7 is provided at the front of the cone hole. In order to facilitate the connection between the DC-liquid-cooled electrode and the DC-pole of the vehicle battery pack, a flat mounting seat is provided at the end of the rear of the cone head opposite to the cone head, and a mounting hole is provided on the mounting seat. The DC-liquid-cooled electrode is connected to the DC-pole of the vehicle battery pack through the mounting seat.

[0050] Since the cost of copper is relatively high, in order to reduce the material cost, the electrode pipe 2.6 is processed in sections. Fig. 9, 10 As shown, a connecting tube 2.8 is screwed to the outward end of the electrode conduit 2.6, wherein the connecting tube 2.8 is provided with an external thread, and the electrode conduit 2.6 is provided with an internal thread corresponding to the external thread. In order to ensure the sealing of the connection, a nut is also screwed to the external thread of the connecting tube 2.8, and an O-ring is provided between the nut and the electrode conduit 2.6. The outer diameter of the electrode conduit 2.6 is smaller than the inner diameter of the connecting tube 2.8. In order to facilitate assembly, the electrode conduit 2.6 extends outward from the connecting tube 2.8. Similarly, the front and rear parts of the DC+ liquid-cooled electrode and the DC- liquid-cooled electrode are connected together by a connecting nut 2.9. Such a split processing method can reduce the cost of processing materials.

[0051] In order to establish the electrical connection between the liquid-cooled electrode 2 and the soft wire 3.3, as Figure 1 , 7 As shown, a semicircular crimped soft wire 3.3 is formed on the inner tube wall of the electrode tube 2.4, and the non-semicircular crimped cavity in the electrode tube 2.4 can realize the connection between the liquid outlet 2.2 and the cooling liquid outer channel 3.2; the cooling liquid inner tube 3.4 located at the end of the liquid-cooled electrode 2 penetrates the circular twisted copper wire mesh of the soft wire 3.3, and is plugged into the electrode conduit 2.6, so that the cooling liquid inner channel 3.1 is connected with the liquid inlet 2.1. On the one hand, the semicircular crimping increases the contact area between the soft wire 3.3 and the electrode tube 2.4, which can withstand a large current. On the other hand, the strong pressure makes the soft wire 3.3 and the liquid-cooled electrode 2 crimped into one, which can withstand a large axial pulling force. Therefore, the semicircular crimping can realize a reliable electrical connection between the soft wire 3.3 and the liquid-cooled electrode 2, and isolate the coolants in the cooling liquid inner channel 3.1 and the cooling liquid outer channel 3.2 from each other in the liquid-cooled electrode 2.

[0052] Working principle: Figure 8 As shown, an on-board coolant circulation cooling device 5 is provided on the electric vehicle, which provides power for the circulation of the coolant on the one hand, and dissipates heat and cools the coolant on the other hand. The coolant cooled by the on-board coolant circulation cooling device 5 enters the coolant inner channel 3.1 from the liquid inlet 2.1 of the liquid-cooled electrode 2 and the electrode conduit 2.6, and then enters the coolant outer channel 3.2 through the inner cavity 1.12 and the outer cavity 1.13, and finally flows out through the liquid outlet 2.2 of the liquid-cooled electrode 2 and returns to the on-board coolant circulation cooling device 5, thereby realizing the circulation cooling of the liquid-cooled charging socket.

[0053] The parts not described in detail in the present invention are prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid-cooled cable for a new energy electric vehicle charging socket, characterized in that: include: A socket housing (4), two liquid cooling jacks (1) DC+ and DC- arranged in the socket housing (4), and a plurality of signal lines; the liquid cooling jack (1) is provided with a communication cavity (1.1); It also includes two liquid-cooling electrodes (2) for connecting to DC+ and DC- poles of the vehicle-mounted battery pack, wherein the liquid-cooling electrodes (2) are provided with a liquid inlet (2.1) and a liquid outlet (2.2) for the inlet and outlet of cooling liquid; and two liquid cooling cables (3) respectively connected between the DC+ liquid cooling jack (1) and the DC+ liquid cooling electrode (2), and between the DC- liquid cooling jack (1) and the DC- liquid cooling electrode (2); the liquid cooling cable (3) comprises an insulating sleeve (3.5), a soft wire (3.3) is arranged inside the insulating sleeve (3.5), and an inner cooling liquid channel (3.1) along the soft wire (3.3) from the liquid cooling electrode (2) to the liquid cooling jack (1) and an outer cooling liquid channel (3.2) along the soft wire (3.3) from the liquid cooling jack (1) to the liquid cooling electrode (2); the ends of the inner cooling liquid channel (3.1) and the outer cooling liquid channel (3.2) connected to the liquid cooling electrode (2) are respectively connected to the liquid inlet (2.1) and the liquid outlet (2.2), and the ends connected to the liquid cooling jack (1) are connected to the connecting cavity (1.1); The liquid-cooled electrode (2) is composed of a front part of a cone head and a rear part of a cone hole; the front part of the cone head is an axial body with an outer cone surface at one end, the end with the outer cone surface is provided with a through hole (2.3), and the other end is an electrode pipe (2.4) connected to the through hole (2.3), and a liquid outlet (2.2) is provided on the tube wall of the electrode pipe (2.4); the rear part of the cone hole is an axial body, one end of which is provided with an inner cone surface corresponding to the end of the front part of the cone head with the outer cone surface, and a countersunk hole (2.5) corresponding to the through hole (2.3), and a liquid inlet (2.1) is provided on the hole wall of the countersunk hole (2.5); the outer cone surface of the front part of the cone head fits with the inner cone surface of the rear part of the cone hole and is screwed together; a soft semicircular crimped surface is provided on the inner tube wall of the electrode pipe (2.4); The body conductor (3.3) is provided with an insulating sleeve (3.5) sleeved on the outer cylindrical surface of the electrode pipe (2.4); the electrode guide tube (2.6) is inserted into the through hole (2.3); the electrode guide tube (2.6) extends outward from the electrode pipe (2.4) and is inserted into the coolant inner pipe (3.4); the coolant inner channel (3.1) is connected to the liquid inlet (2.1) through the electrode guide tube (2.6) and the countersunk hole (2.5); the coolant outer channel (3.2) is connected to the liquid outlet (2.2) through the electrode pipe (2.4); a sealing groove is also provided at one end of the front part of the cone head with an outer cone surface, a sealing ring (2.7) is arranged in the sealing groove, and a sealing countersunk hole corresponding to the sealing ring (2.7) is provided at the tail of the cone hole.

2. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 1, characterized in that: The cavity between the insulating sleeve (3.5) and the soft wire (3.3) is the cooling liquid external channel (3.2); one end of the cooling liquid external channel (3.2) connected to the liquid cooling electrode (2) is communicated with the liquid outlet (2.2); and one end connected to the liquid cooling socket (1) is communicated with the connecting cavity (1.1); the soft wire (3.3) is a hollow soft wire, and a cooling liquid inner tube (3.4) is provided inside; the inner cavity of the cooling liquid inner tube (3.4) is the cooling liquid inner channel (3.1); one end of the cooling liquid inner channel (3.1) connected to the liquid cooling electrode (2) is communicated with the liquid inlet (2.1); and one end connected to the liquid cooling socket (1) is communicated with the connecting cavity (1.1).

3. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 2, characterized in that: The liquid cooling jack (1) is shaft-shaped, one end of which is a jack end (1.2) corresponding to a charging gun terminal, and the other end of which is a connecting end (1.3) connected to a liquid cooling cable (3); a connecting cavity (1.1) is provided on the end surface of the connecting end (1.3); a soft wire (3.3) is crimped in a semicircular manner on the inner wall of the connecting cavity (1.1); and an insulating sleeve (3.5) is sleeved on the outer cylindrical surface of the connecting end (1.3).

4. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 3, characterized in that: The connecting cavity (1.1) extends toward the socket end (1.2) and is enclosed within the outer wall of the socket of the socket end (1.2).

5. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 3 or 4, characterized in that: An annular flow dividing sleeve (1.11) is provided in the connecting cavity (1.1), and the annular flow dividing sleeve (1.11) divides the connecting cavity (1.1) into two cavities, an inner cavity and an outer cavity, wherein the inner cavity (1.12) is connected to the inner channel (3.1) of the cooling liquid, and the outer cavity (1.13) is connected to the outer channel (3.2) of the cooling liquid, and the inner cavity (1.12) and the outer cavity (1.13) are connected at the connecting cavity (1.1) near the socket end (1.2).

6. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 5, characterized in that: The inner cavity (1.12) is sealedly connected to a plug conduit (1.4) near the connection end (1.3); the outer diameter of the plug conduit (1.4) is smaller than the inner diameter of the connecting cavity (1.1); the plug conduit (1.4) extends outward from the connection end (1.3) and is plugged into the coolant inner tube (3.4).

7. A liquid-cooled cable for a new energy electric vehicle charging socket as claimed in claim 2, characterized in that: The coolant inner tube (3.4) is a polytetrafluoroethylene tube, and the soft conductor (3.3) comprises a soft conductor and a protective copper mesh, the soft conductor being a plurality of copper wires which are twisted and braided on the outer wall of the polytetrafluoroethylene tube after being twisted, and the protective copper mesh being a layer of protective mesh on the outer wall of the soft conductor through which copper wires are cross-woven.

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