CN111200200A

CN111200200A - Cooling mode of liquid cooling cable for liquid cooling charging socket of new energy electric vehicle

Info

Publication number: CN111200200A
Application number: CN202010062196.2A
Authority: CN
Inventors: 臧昊哲; 杨国星; 臧重庆; 张艳丽
Original assignee: Luoyang Zhengqi Machinery Co ltd
Current assignee: Luoyang Zhengqi Machinery Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-05-26
Anticipated expiration: 2040-01-20
Also published as: CN111200200B; WO2021147872A1

Abstract

The cooling mode of the liquid cooling cable for the liquid cooling charging socket of the new energy electric automobile comprises two DC + and DC-liquid cooling jacks arranged in the electric automobile charging socket, two liquid cooling electrodes connected with a DC + and DC-pole of a battery pack, 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 comprises a soft conducting wire for conducting electricity, a cooling liquid inner channel and a cooling liquid outer channel for cooling the liquid cooling cable; the end of the cooling liquid inner channel and the end of the cooling liquid outer channel connected with the liquid cooling electrode are respectively communicated with the liquid inlet and the liquid outlet, and the end of the cooling liquid inner channel and the end of the cooling liquid outer channel connected with the liquid cooling jack are communicated with the communicating cavity. According to the invention, on the premise of not increasing the diameter of the existing cable, the current borne by the charging cable is increased from the existing 250A to 600A, the temperature rise of the charging cable can be ensured within a controllable range, and meanwhile, the requirement of a user on the charging time of the electric automobile is met.

Description

Cooling mode of liquid cooling cable for liquid cooling charging socket of new energy electric vehicle

Technical Field

The invention relates to the technical field of charging of electric vehicles, in particular to a cooling mode of a liquid cooling cable for a liquid cooling charging socket of a new energy electric vehicle.

Background

New energy electric vehicles are rapidly developed because of no exhaust emission and no environmental pollution. At present, two main factors for restricting the development of new energy electric automobiles are as follows: firstly, the battery has short cruising ability; secondly, the charging duration. Taking charging of the electric bus as an example, the currently used charging pile with the maximum power is a medium-power direct-current charging pile, the charging voltage of the charging pile is 750 volts direct current, the output maximum charging current is 250 amperes direct current, theoretically, the charging for the electric bus requires at least 2-3 hours to fully charge the battery of the electric bus. However, since the charging socket on the electric vehicle is usually mounted on the vehicle body housing, and the battery is placed in the vehicle body, the socket and the battery pack are connected by two 70 mm square dry cables. Because the dry-type cable routing space is narrow and small, the heat dissipation is poor, and the information that the user fed back is: when the current reaches 250A, the heat generated by the conductive jack and the soft conductor cannot be well dissipated, so that the temperature of the cable is overhigh. In order to avoid accidents caused by overheating of the cable, the actual charging current is usually controlled below 180A, so that the actual charging time of the electric bus is longer than the theoretical charging time.

The patent with the patent application number of CN201810249723.3 discloses a special DC + and DC-cooling liquid-cooling cable for a high-power charging pile, which is characterized in that the outer diameter of the cable is as large as that of a dry-type integrated cable used by a medium-power direct-current charging pile, the technical scheme adopted by the cable is that the sectional area of a dry-type integrated cable soft conductor used by the medium-power direct-current charging pile is reduced, the sectional area of the dry-type integrated cable soft conductor used by the medium-power direct-current charging pile is 70 square millimeters, the sectional area of a liquid-cooling cable soft conductor is 35 square millimeters, the saved space is used as a channel of cooling liquid, circulating cooling liquid is introduced into the gap of the soft conductor, the heat generated in the charging process of the conductor is taken away by the cooling liquid, and the current bearing capacity of the charging cable can be greatly improved. The maximum current that bears of 70 square millimeter's dry-type cable is 250A, adopts the liquid cooling technique back, and the liquid cooling cable of 35 square millimeters can bear 600A electric currents to can safe and reliable long-term work. At present, the high-power direct-current charging pile which is researched and developed at home can output direct current of 1000V and 400A-600A, the high-power charging pile is used for charging an electric bus, and the battery pack can be charged in 40 minutes at the fastest speed.

The high-power direct current charging pile is used for charging the new energy electric automobile, so that the bottleneck problem of long time for charging the new energy electric automobile can be effectively solved, but the system engineering is also provided. Although there are high-power charging piles, and there are liquid cooling cables and liquid cooling charging guns dedicated to high-power charging piles, the high-power charging sockets capable of being matched with the high-power direct current liquid cooling charging guns and the dedicated cables matched with the high-power charging sockets must be installed on the new energy electric vehicle. If the new energy electric automobile still uses the 250A middle power socket, the 70 square millimeter dry cable and the dry conductive jack, in the charging process, if the charging current is larger than 250A, the heat generated by the cable can not be well dissipated, an accident can be caused due to overheating, and serious people can cause fire and burn out the automobile. Therefore, the rapid development of new energy electric vehicles requires a special high-power charging cable which can be used in new energy electric vehicles.

Disclosure of Invention

In order to overcome the defects in the background art, the invention discloses a cooling mode of a liquid cooling cable for a liquid cooling charging socket of a new energy electric vehicle, which can increase the charging voltage borne by the charging cable from the existing 750V to 1000V and increase the charging current from the existing 250A to 600A on the premise of not increasing the diameter of the existing cable, can ensure that the temperature rise of the charging cable is within a controllable range, ensures the safe charging of the electric vehicle, and can reliably work for a long time.

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

the utility model provides a new forms of energy electric automobile liquid cooling charges cooling method of liquid cooling cable for socket, including setting up two liquid cooling jacks of DC +, DC-in electric automobile charging socket: the liquid cooling jack is provided with a communicating cavity;

still include with group battery DC +, two liquid cooling electrodes that DC-utmost point post is connected: the liquid cooling electrode is provided with a liquid inlet and a liquid outlet for the inlet and the outlet of cooling liquid;

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 comprises a soft conducting wire for conducting electricity, a cooling liquid inner channel and a cooling liquid outer channel for cooling the liquid cooling cable; the end of the cooling liquid inner channel and the end of the cooling liquid outer channel connected with the liquid cooling electrode are respectively communicated with the liquid inlet and the liquid outlet, and the end of the cooling liquid inner channel and the end of the cooling liquid outer channel connected with the liquid cooling jack are communicated with the communicating cavity.

Preferably, the soft lead penetrates through the insulating sleeve, a cavity between the insulating sleeve and the soft lead is a cooling liquid outer channel, one end of the cooling liquid outer channel, which is connected with the liquid cooling electrode, is communicated with the liquid outlet, and one end of the cooling liquid outer channel, which is connected with the liquid cooling jack, is communicated with the communicating cavity; the utility model discloses a liquid cooling electrode, including the cooling liquid inner tube, the cooling liquid inner tube is connected with the liquid cooling electrode, the software wire is cavity software wire, and inside runs through and is provided with the coolant liquid inner tube, and the inner chamber of coolant liquid inner tube is coolant liquid inner channel, the one end that coolant liquid inner channel and liquid cooling electrode are connected, with the inlet intercommunication, with the one end of liquid cooling jack connection, with the intercommunication chamber intercommunication.

Preferably, the liquid cooling jack is axle form, and one end is the jack end that corresponds the grafting with the rifle terminal that charges, and the other end is the link of being connected with the liquid cooling cable, is equipped with the intercommunication chamber at the terminal surface of link, and semicircle pressfitting has the software wire on the inner wall in intercommunication chamber, has cup jointed insulation support on the outer face of cylinder of link.

Preferably, the communication cavity extends towards the jack end and is enclosed in the outer wall of the jack at the jack end.

Preferably, an annular shunting sleeve is arranged in the communicating cavity and divides the communicating cavity into an inner cavity and an outer cavity by the annular shunting sleeve, wherein the inner cavity is communicated with the cooling liquid inner channel, the outer cavity is communicated with the cooling liquid outer channel, and the inner cavity and the outer cavity are communicated at the position, close to the jack, of the communicating cavity.

Preferably, the inner cavity is connected with a jack pipe close to the connecting end in a sealing manner, the outer diameter of the jack pipe is smaller than the inner diameter of the communicating cavity, and the jack pipe extends out of the connecting end and is connected with the cooling liquid inner pipe in an inserting manner.

Preferably, the liquid-cooled electrode consists of a conical head front part and a conical hole tail part; the front part of the cone head is a shaft-shaped body with an external conical surface at one end, a through hole is arranged at one end with the external conical surface, an electrode pipeline communicated with the through hole is arranged at the other end, and a liquid outlet is arranged on the pipe wall of the electrode pipeline; the tail part of the conical hole is a shaft-shaped body, one end of the shaft-shaped body is provided with an inner conical surface corresponding to one end with an outer conical surface at the front part of the conical head and a counter bore corresponding to the through hole, and the wall of the counter bore is provided with a liquid inlet; the outer conical surface at the front part of the conical head is matched and attached with the inner conical surface at the tail part of the conical hole and is in threaded connection with the inner conical surface; a soft lead is connected to the upper half circle of the inner pipe wall of the electrode pipe in a pressing mode, an insulating sleeve is sleeved on the outer cylindrical surface of the electrode pipe, an electrode guide pipe is inserted into the through hole, the electrode guide pipe extends out of the electrode pipe outwards and is connected with the cooling liquid inner pipe in an inserting mode, the cooling liquid inner channel is communicated with the liquid inlet through the electrode guide pipe and the counter bore, and the cooling liquid outer channel is communicated with the liquid outlet through the electrode pipe; the end of the front part of the conical head with the outer conical surface is also provided with a sealing groove, a sealing ring is arranged in the sealing groove, and the tail part of the conical hole is provided with a sealing counter bore corresponding to the sealing ring.

Preferably, the liquid cooling electrode consists of a front part of the taper hole and a rear part of the taper head; the front part of the taper hole is a shaft-shaped body with an inner conical surface at one end, a through hole is arranged at one end with the inner conical surface, an electrode pipeline communicated with the through hole is arranged at the other end, and a liquid outlet is arranged on the pipe wall of the electrode pipeline; the rear part of the conical head is a shaft-shaped body, one end of the shaft-shaped body is provided with an outer conical surface corresponding to one end with an inner conical surface at the front part of the conical hole and a counter bore corresponding to the through hole, and the wall of the counter bore is provided with a liquid inlet; the inner conical surface at the front part of the conical hole is matched and attached with the outer conical surface at the rear part of the conical head and is in threaded connection with the conical surface; a soft lead is connected to the upper half circle of the inner pipe wall of the electrode pipeline in a pressing mode, an insulating sleeve is sleeved on the outer cylindrical surface of the electrode pipeline, an electrode guide pipe is inserted into the through hole, the electrode guide pipe extends out of the electrode pipeline and is connected with the cooling liquid inner pipe, the cooling liquid inner channel is communicated with the liquid inlet through the electrode guide pipe and the counter bore, and the cooling liquid outer channel is communicated with the liquid outlet through the electrode pipeline; the end of the rear part of the conical head with the outer conical surface is also provided with a sealing groove, a sealing ring is arranged in the sealing groove, and the front part of the conical hole is provided with a sealing counter bore corresponding to the sealing ring.

Preferably, the liquid cooling cable comprises an insulating sleeve, the soft conductor penetrates through the insulating sleeve, a cooling liquid inner pipe also penetrates through the insulating sleeve, an inner cavity of the cooling liquid inner pipe is a cooling liquid inner channel, and a cavity between the cooling liquid inner pipe and the insulating sleeve is a cooling liquid outer channel; one end of the cooling liquid inner channel, which is connected with the liquid cooling electrode, is communicated with the liquid inlet, and the other end of the cooling liquid inner channel, which is connected with the liquid cooling jack, is communicated with the communicating cavity; the end of the cooling liquid outer channel connected with the liquid cooling electrode is communicated with the liquid outlet, and the end of the cooling liquid outer channel connected with the liquid cooling jack is communicated with the communicating cavity.

Preferably, the soft lead is a lead formed by twisting a plurality of strands of twisted copper wire meshes; the inner cooling liquid pipe is a polytetrafluoroethylene pipe.

Due to the adoption of the technical scheme, compared with the background technology, the invention has the following beneficial effects:

the invention provides a large-current charging solution for the charging cable of the electric automobile by cooling the DC + and DC-charging cables in parallel, on the premise of not increasing the diameter of the existing charging cable, the charging voltage borne by the liquid cooling cable with the wire section area of only 35 square millimeters is increased from the existing 750V to 1000V, the charging current is increased from the existing 250A to 600A, and the liquid cooling cable can be ensured to be in a controllable temperature rise range, ensure the safe charging of the electric automobile and reliably work for a long time.

The charging power borne by the liquid cooling cable is greatly improved, the charging time of the electric automobile can be greatly shortened by matching with a high-power charging pile, the charging time is only one third of that of the conventional medium-power dry-type cable with the wire section area of 70 square millimeters, the requirement of a user on the charging time of the electric automobile is met, and the rapid development of a new energy electric automobile is facilitated.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a liquid-cooled cable.

FIG. 3 is a schematic diagram of a liquid-cooled jack.

Fig. 4 is a schematic view of the cross-sectional structure a-a of fig. 1.

FIG. 5 is a schematic diagram of a DC + liquid cooled electrode configuration.

FIG. 6 is a schematic diagram of a DC-liquid cooled electrode structure

Fig. 7 is a schematic view of a cross-sectional structure B-B of fig. 1.

Fig. 8 is a schematic diagram of the working principle of the present invention.

Fig. 9 is a schematic structural view in embodiment 2 of the present invention.

FIG. 10 is a schematic view of the structure of a DC + liquid-cooled electrode in example 2.

FIG. 11 is a schematic view of the structure of a DC-liquid cooled electrode in example 2.

In the figure: 1. a liquid cooling jack; 1.1, a communicating cavity; 1.11, an annular flow-dividing sleeve; 1.12, an inner layer cavity; 1.13, an outer cavity; 1.2, a jack end; 1.3, connecting ends; 1.4, a jack conduit; 1.5, crown spring; 2. liquid cooling the electrodes; 2.1, a liquid inlet; 2.2, a liquid outlet; 2.3, through holes; 2.4, electrode pipelines; 2.5, counter bores; 2.6, electrode catheter; 2.7, a sealing ring; 2.8, connecting pipes; 2.9, connecting a nut; 3. liquid cooling cables; 3.1, cooling liquid inner channels; 3.2, cooling liquid outer channels; 3.3, soft conducting wire; 3.4, a cooling liquid inner pipe; 3.5, insulating sleeves; 4. vehicle-mounted cooling liquid circulating cooling device.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1:

at present, the state has standard definition on a plurality of cables in a charging cable and a charging socket of an electric automobile, and the charging cable comprises two charging cables of DC + and DC-, and a plurality of weak current cables such as signal wires and communication wires.

Fig. 1 shows a schematic structural diagram of a cooling mode of a liquid cooling cable for a liquid cooling charging socket of a new energy electric vehicle, which includes two DC + and DC-liquid cooling jacks 1 arranged in the charging socket of the electric vehicle, two liquid cooling electrodes 2 connected with DC + and DC-poles of a 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. Wherein, liquid cooling jack 1 is equipped with intercommunication chamber 1.1, and liquid cooling electrode 2 is equipped with inlet 2.1, the liquid outlet 2.2 that is used for the coolant liquid to come in and go out. Two liquid cooling jacks 1 of DC + and DC-arranged in the charging socket of the electric automobile are connected with a charging terminal in a high-power direct current charging gun.

As shown in fig. 2, the liquid-cooled cable 3 includes a flexible conducting wire 3.3 for conducting electricity, a cooling liquid inner passage 3.1 for cooling the liquid-cooled cable, and a cooling liquid outer passage 3.2. In this embodiment, the soft wire 3.3 penetrates through the insulating sleeve 3.5, the cavity between the insulating sleeve 3.5 and the soft wire 3.3 is a cooling liquid outer passage 3.2, one end of the cooling liquid outer passage 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 jack 1 is communicated with the communicating cavity 1.1.

The soft wire 3.3 is a hollow soft wire, the inside of the hollow soft wire is provided with a cooling liquid inner tube 3.4 in a penetrating way, the inner cavity of the cooling liquid inner tube 3.4 is a cooling liquid inner channel 3.1, one end of the cooling liquid inner channel 3.1, which is connected with the liquid cooling electrode 2, is communicated with the liquid inlet 2.1, and one end of the cooling liquid inner channel, which is connected with the liquid cooling jack 1, is communicated with the communicating cavity 1.1. It should be understood that the "liquid inlet 2.1" of the liquid-cooled electrode 2 is only for convenience of description, and the "liquid inlet 2.1" is not limited to be an inlet for the cooling liquid to enter the liquid-cooled cable, and the "liquid inlet 2.1" may also be an outlet for the cooling liquid to flow out of the liquid-cooled cable. The cooling liquid inner channel 3.1 is communicated with the liquid inlet 2.1, and the external cooling liquid is not limited to flow into the cooling liquid inner channel 3.1 through the liquid inlet 2.1, but the cooling liquid in the cooling liquid inner channel 3.1 can also be understood to flow out of the liquid cooling 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 of the cooling liquid from the liquid-cooled cable, and the "liquid outlet 2.2" may also be understood to be the inlet of the cooling liquid into the liquid-cooled cable. The cooling liquid outer channel 3.2 is communicated with the "liquid outlet 2.2", and the cooling liquid in the cooling liquid outer channel 3.2 is not limited to flow out through the "liquid outlet 2.2", but the cooling liquid can also be understood to enter the cooling liquid outer channel 3.2 through the "liquid outlet 2.2".

The soft conductor 3.3 consists of a soft conductor and a protective copper net, the soft conductor and the protective copper net are all ring-shaped conductors formed by twisting a plurality of strands of twisted copper wire nets, the protective copper net is a layer of protective copper net formed by weaving copper wires on the outer circular wall of the soft conductor in a crossed mode, and the protective copper net is conductive in an auxiliary mode and plays a role in preventing the soft conductor from loosening. The soft lead 3.3 penetrates between the cooling liquid inner channel 3.1 and the cooling liquid outer channel 3.2. The soft lead 3.3 is soaked in the cooling liquid, and the cooling liquid can be fully contacted with the surface of the soft lead 3.3, so that heat conduction and heat dissipation are easy. The inner cooling liquid pipe 3.4 is a high-temperature-resistant polytetrafluoroethylene pipe which has good chemical stability in a high-temperature working environment. The soft lead 3.3, the cooling liquid inner pipe 3.4 and the insulating sleeve 3.5 have better bending performance, and the liquid cooling cable 3 is convenient to bend and wire in the electric automobile.

The soft wire 3.3 is a hollow soft wire, the inner tube 3.4 of the cooling liquid is arranged inside the soft wire 3.3, that is, the inner channel 3.1 of the cooling liquid is positioned inside the outer channel 3.2 of the cooling liquid, and the cooling liquid in the inner channel 3.1 of the cooling liquid and the cooling liquid in the outer channel 3.2 of the cooling liquid are mutually isolated, thus forming independent channels for the inlet and the outlet of the cooling liquid.

Fig. 3 shows a structural schematic diagram of the liquid cooling jack, the liquid cooling jack 1 is in an axial shape, one end of the liquid cooling jack is a jack end 1.2 correspondingly spliced with the charging gun terminal, the other end of the liquid cooling jack is a connecting end 1.3 connected with a liquid cooling cable 3, a communicating cavity 1.1 is arranged on the end face of the connecting end 1.3, a soft wire 3.3 is semi-circularly crimped on the inner wall of the communicating cavity 1.1, and an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the connecting end 1.3. The end face of the jack end 1.2 is provided with a jack corresponding to the charging gun terminal, and a crown spring 1.5 is arranged in the jack and used for clamping the charging gun terminal and establishing the electric connection between the charging gun terminal and the liquid cooling jack 1.

Patent application No. CN201820408462.0 discloses a semicircular crimping method for establishing electrical connection between a soft wire and a liquid-cooling terminal, which can realize reliable electrical connection between the soft wire and the liquid-cooling terminal without affecting the communication between the inner tube of the cooling liquid and the liquid-cooling terminal. As shown in fig. 1 and 4, in this embodiment, the soft lead 3.3 is crimped on the upper semicircle of the inner wall of the communicating cavity 1.1, and the communicating cavity 1.1, the inner cooling liquid channel 3.1 and the outer cooling liquid channel 3.2 can be communicated with each other by the non-semicircular crimped cavity in the communicating cavity 1.1. The semicircular crimping increases the contact area of the soft lead 3.3 and the communicating cavity 1.1 and can bear larger current, and on the other hand, the strong pressure enables the soft lead 3.3 and the liquid cooling jack 1 to be crimped into a whole and can bear larger axial pulling force. Therefore, the soft lead 3.3 is pressed on the semicircle on the inner wall of the communicating cavity 1.1, so that the reliable electrical connection between the soft lead 3.3 and the liquid cooling jack 1 can be realized, and the mutual communication of the cooling liquid inner channel 3.1 and the cooling liquid outer channel 3.2 in the liquid cooling jack 1 is not influenced.

Because the crown spring 1.5 connected with the charging gun terminal in a contact way can generate a large amount of heat due to poor contact, the communication cavity 1.1 extends towards the jack end 1.2 and is sealed in the outer wall of the jack end 1.2 for cooling the jack end 1.2. Because the coolant in the communicating cavity 1.1 near the part cavity of the jack end 1.2 has poor fluidity and poor cooling effect, and affects the cooling of the jack end 1.2, an annular flow dividing sleeve 1.11 is arranged in the communicating cavity 1.1, the communicating cavity 1.1 is divided into an inner cavity and an outer cavity by the annular flow dividing sleeve 1.11, wherein, the inner cavity 1.12 is communicated with the coolant inner channel 3.1, the outer cavity 1.13 is communicated with the coolant outer channel 3.2, and the inner cavity 1.12 and the outer cavity 1.13 are communicated at the communicating cavity 1.1 near the jack end 1.2. In this way, the coolant in the coolant inner channel 3.1 enters the communication cavity 1.1 through the inner cavity 1.12 on the side close to the jack end 1.2 and then returns to the coolant outer channel 3.2 from the outer cavity 1.13, thereby realizing the flowing cooling of the jack end 1.2.

In order to reduce the processing difficulty of the annular shunt sleeve 1.11 and facilitate assembly, the inner cavity 1.12 is connected with the jack conduit 1.4 close to the connecting end 1.3 in a sealing manner, the outer diameter of the jack conduit 1.4 is smaller than the inner diameter of the communicating cavity 1.1, and the jack conduit 1.4 extends out of the connecting end 1.3. The cooling liquid inner pipe 3.4 at the end of the liquid cooling jack 1 penetrates through the annular twisted copper wire mesh of the soft lead 3.3 and is spliced with the jack guide pipe 1.4, so that the cooling liquid inner channel 3.1 is communicated with the inner layer cavity 1.12.

This new forms of energy electric automobile liquid cooling is cooling mode one end of liquid cooling cable for charging socket and is connected with the charging socket, and the other end is connected with the group battery. In order to facilitate installation and distinguish the positive pole and the negative pole of the battery pack correspondingly connected with the DC-charging cable and the DC-charging cable, the liquid cooling electrode 2 is divided into a conical head part and a conical hole part, and the conical head part and the conical hole part of the liquid cooling electrode 2 of the DC-charging cable and the DC-charging cable are different and are not universal.

Fig. 5 is a schematic structural diagram of a DC + liquid-cooled electrode, which is connected to a DC + liquid-cooled jack and a battery pack DC + post in an electric vehicle charging socket, and is composed of a front portion of a conical head and a rear portion of a conical hole; the front part of the conical head is a shaft-shaped body with an external conical surface at one end, a through hole 2.3 is arranged at one end with the external conical surface, an electrode pipeline 2.4 communicated with the through hole 2.3 is arranged at the other end, and a liquid outlet 2.2 is arranged on the pipe wall of the electrode pipeline 2.4; the tail part of the taper hole is a shaft-shaped body, one end of the shaft-shaped body is provided with an inner conical surface corresponding to one end with an outer conical surface at the front part of the taper head and a counter bore 2.5 corresponding to the through hole 2.3, and the hole wall of the counter bore 2.5 is provided with a liquid inlet 2.1; the outer conical surface at the front part of the conical head is matched and attached with the inner conical surface at the tail part of the conical hole and is in threaded connection with the inner conical surface; the inner pipe wall of the electrode pipeline 2.4 is in semicircular pressure connection with a soft lead 3.3, the structure and the principle of the semicircular pressure connection in the electrode pipeline are the same as those of the semicircular pressure connection in the liquid cooling jack, and the description is not repeated; an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the electrode pipeline 2.4, an electrode guide pipe 2.6 is inserted in the through hole 2.3, the electrode guide pipe 2.6 extends out of the electrode pipeline 2.4 and is connected with the cooling liquid inner pipe 3.4 in an inserting mode, the cooling liquid inner channel 3.1 is communicated with the liquid inlet 2.1 through the electrode guide pipe 2.6 and the counter bore 2.5, and the cooling liquid outer channel 3.2 is communicated with the liquid outlet 2.2 through the electrode pipeline 2.4. The outer pipe wall of the electrode pipe 2.4 is also provided with a horse tooth for preventing the insulation sleeve 3.5 from slipping, and the insulation sleeve 3.5 is provided with a hoop which is matched and locked with the horse tooth to ensure the sealing performance between the insulation sleeve 3.5 and the outer pipe wall of the electrode pipe 2.4.

In order to increase the sealing performance between the front part of the conical head and the tail part of the conical hole, a sealing groove is further formed in one end, provided with an outer conical surface, of the front part of the conical head, a sealing ring 2.7 is arranged in the sealing groove, a sealing counter bore corresponding to the sealing ring 2.7 is formed in the tail part of the conical hole, and the front part of the conical head and the tail part of the conical hole are sealed through the sealing ring 2.7.

In order to facilitate the connection of the DC + liquid cooling electrode and the DC + pole of the battery pack, a flat mounting seat is arranged at one end of the tail part of the taper hole, which is opposite to the taper hole, and a mounting hole is formed in the mounting seat. The DC + liquid cooling electrode is connected with the DC + pole of the battery pack through the mounting seat.

On the contrary, the DC-liquid cooling electrode connected to the DC-liquid cooling jack and the DC-pole of the battery pack in the charging socket of the electric vehicle, as shown in fig. 6, is composed of a front part of the taper hole and a rear part of the taper head; the front part of the taper hole is a shaft-shaped body with an inner conical surface at one end, a through hole 2.3 is arranged at one end with the inner conical surface, an electrode pipeline 2.4 communicated with the through hole 2.3 is arranged at the other end, and a liquid outlet 2.2 is arranged on the pipe wall of the electrode pipeline 2.4; the rear part of the conical head is a shaft-shaped body, one end of the shaft-shaped body is provided with an outer conical surface corresponding to one end with an inner conical surface at the front part of the conical hole and a counter bore 2.5 corresponding to the through hole 2.3, and the wall of the counter bore 2.5 is provided with a liquid inlet 2.1; the inner conical surface at the front part of the conical hole is matched and attached with the outer conical surface at the rear part of the conical head and is in threaded connection with the conical surface; the electrode tube 2.4 is characterized in that a soft lead 3.3 is pressed on the inner tube wall of the electrode tube 2.4 in a semicircular manner, an insulating sleeve 3.5 is sleeved on the outer cylindrical surface of the electrode tube 2.4, an electrode guide tube 2.6 is inserted in the through hole 2.3, the electrode guide tube 2.6 extends out of the electrode tube 2.4 and is connected with the cooling liquid inner tube 3.4, the cooling liquid inner channel 3.1 is communicated with the liquid inlet 2.1 through the electrode guide tube 2.6 and the counter bore 2.5, and the cooling liquid outer channel 3.2 is communicated with the liquid outlet 2.2 through the electrode tube 2.4. The outer pipe wall of the electrode pipe 2.4 is also provided with a horse tooth for preventing the insulation sleeve 3.5 from slipping, and the insulation sleeve 3.5 is provided with a hoop which is matched and locked with the horse tooth to ensure the sealing performance between the insulation sleeve 3.5 and the outer pipe wall of the electrode pipe 2.4.

Similarly, in order to increase the sealing performance between the front part of the taper hole and the rear part of the taper head, a sealing groove is further formed in one end, provided with an outer conical surface, of the rear part of the taper head, a sealing ring 2.7 is arranged in the sealing groove, and a sealing counter bore corresponding to the sealing ring 2.7 is formed in the front part of the taper hole. In order to facilitate the connection of the DC-liquid cooling electrode and the DC-pole of the battery pack, a flat mounting seat is arranged at one end of the rear part of the conical head, which is opposite to the conical head, and a mounting hole is arranged on the mounting seat. The DC-liquid cooling electrode is connected with the DC-pole of the battery pack through the mounting seat.

In order to establish the electrical connection between the liquid-cooled electrode 2 and the soft lead 3.3, as shown in fig. 1 and 7, the soft lead 3.3 is pressed on the inner wall of the electrode tube 2.4 in a semicircular manner, and the non-semicircular pressed cavity in the electrode tube 2.4 can realize the communication between the liquid outlet 2.2 and the cooling liquid outer channel 3.2; the cooling liquid inner pipe 3.4 at the end of the liquid cooling electrode 2 penetrates through the annular twisted copper wire mesh of the soft lead 3.3 and is spliced with the electrode guide pipe 2.6, so that the cooling liquid inner channel 3.1 is communicated with the liquid inlet 2.1. The semicircular crimping increases the contact area of the soft lead 3.3 and the electrode pipeline 2.4, and can bear larger current, and on the other hand, the strong pressure enables the soft lead 3.3 and the liquid cooling electrode 2 to be crimped into a whole, and can bear larger axial pulling force. Therefore, the semicircular crimping can realize reliable electrical connection between the soft lead 3.3 and the liquid-cooled electrode 2, and the cooling liquid in the cooling liquid inner channel 3.1 and the cooling liquid outer channel 3.2 are mutually isolated in the liquid-cooled electrode 2.

The working principle is as follows: as shown in fig. 8, an electric vehicle is provided with an on-vehicle coolant circulation cooling device 4 that supplies power for circulating the coolant on the one hand and performs heat dissipation cooling on the coolant on the other hand. The cooling liquid cooled by the vehicle-mounted cooling liquid circulating cooling device 4 enters the cooling liquid inner channel 3.1 from the liquid inlet 2.1 of the liquid cooling electrode 2 and the electrode guide pipe 2.6, then enters the cooling liquid outer channel 3.2 through the inner layer cavity 1.12 and the outer layer cavity 1.13, finally flows out of the liquid outlet 2.2 of the liquid cooling electrode 2 and returns to the vehicle-mounted cooling liquid circulating cooling device 4, and cooling of the liquid cooling cable for the liquid cooling charging socket is achieved.

Example 2:

the cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle according to embodiment 1 is different from embodiment 1 in that: as shown in fig. 9, the soft wire 3.3 penetrates through the insulating sleeve 3.5, the inner cooling liquid pipe 3.4 also penetrates through the insulating sleeve 3.5, the inner cavity of the inner cooling liquid pipe 3.4 is the inner cooling liquid channel 3.1, and the cavity between the inner cooling liquid pipe 3.4 and the insulating sleeve 3.5 is the outer cooling liquid channel 3.2. The end that coolant liquid inner channel 3.1 and liquid cooling electrode 2 are connected communicates with inlet 2.1, and the end that is connected with liquid cooling jack 1 communicates with intercommunication chamber 1.1. The end that the outer passageway of coolant liquid 3.2 and liquid cooling electrode 2 are connected communicates with liquid outlet 2.2, and the one end that is connected with liquid cooling jack 1 communicates with intercommunication chamber 1.1.

The soft lead 3.3 is a solid lead twisted by a plurality of strands of twisted copper wire meshes, the soft lead 3.3 is soaked in cooling liquid, and the cooling liquid can be fully contacted with the surface of the soft lead 3.3, so that heat conduction and heat dissipation are easy. The inner cooling liquid pipe 3.4 is a high-temperature-resistant polytetrafluoroethylene pipe which has good chemical stability in a high-temperature working environment. The soft lead 3.3, the cooling liquid inner pipe 3.4 and the insulating sleeve 3.5 have better bending performance, and the liquid cooling cable 3 is convenient to bend and wire in the electric automobile.

The difference between this embodiment and embodiment 1 is that the flexible conductor 3.3 is a solid flexible conductor, and the coolant inner tube 3.4 is no longer disposed inside the flexible conductor 3.3, but disposed inside the insulating sleeve 3.5, that is, the coolant inner channel 3.1 is located inside the coolant outer channel 3.2, and the coolant in the coolant inner channel 3.1 and the coolant outer channel 3.2 are isolated from each other, thereby forming a channel for the inlet and outlet of the coolant. It can be seen that although the present embodiment is different from embodiment 1 in the way of the passage of the cooling liquid into and out of the cable, the cooling of the liquid-cooled cable can be achieved.

Because the red copper material cost is higher, in order to reduce the material cost, the electrode pipeline 2.6 adopts sectional processing. As shown in fig. 10 and 11, the outward end of the electrode tube 2.6 is screwed with a connection tube 2.8, wherein the connection tube 2.8 is provided with an external thread, and the electrode tube 2.6 is provided with an internal thread corresponding to the external thread. In order to ensure the connection tightness, a nut is screwed on the external thread of the connecting pipe 2.8, and an O-shaped ring is arranged between the nut and the electrode pipeline 2.6. The outer diameter of the electrode line 2.6 is smaller than the inner diameter of the connecting line 2.8, and for ease of assembly, the electrode line 2.6 projects outwardly beyond the connecting line 2.8.

Similarly, the front and rear parts of the DC + liquid cooling electrode and the DC-liquid cooling electrode are connected together through a connecting nut 2.9. The split processing mode can reduce the cost of materials.

The invention provides a large-current charging solution for the charging cable of the electric automobile by cooling the DC + and DC-charging cables in parallel, so that the current carried by the charging cable is increased from the existing 250A to 600A on the premise of not increasing the diameter of the existing cable, the temperature rise of the charging cable can be ensured within a controllable range, and the safety of the electric automobile in the charging process can be ensured.

Due to the fact that the charging current is greatly improved, the charging time of the electric automobile is greatly shortened, the requirement of a user on the charging time of the electric automobile is met, and the quick development of the new energy electric automobile is facilitated.

The present invention is not described in detail in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a new forms of energy electric automobile liquid cooling charges cooling method of liquid cooling cable for socket, characterized by: the electric automobile charging socket comprises two liquid cooling jacks (1) of DC + and DC-arranged in the electric automobile charging socket: the liquid cooling jack (1) is provided with a communicating cavity (1.1);

the battery pack also comprises two liquid cooling electrodes (2) connected with the DC + and DC-poles of the battery pack: the liquid cooling electrode (2) is 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 a soft conducting wire (3.3) for conducting electricity, a cooling liquid inner channel (3.1) and a cooling liquid outer channel (3.2) for cooling the liquid cooling cable; the end of the cooling liquid inner channel (3.1) and the end of the cooling liquid outer channel (3.2) connected with the liquid cooling electrode (2) are respectively communicated with the liquid inlet (2.1) and the liquid outlet (2.2), and the end of the cooling liquid inner channel connected with the liquid cooling jack (1) is communicated with the communicating cavity (1.1).

2. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 1, characterized in that: the liquid cooling cable (3) comprises an insulating sleeve (3.5), a soft lead (3.3) penetrates through the insulating sleeve (3.5), a cavity between the insulating sleeve (3.5) and the soft lead (3.3) is a cooling liquid outer channel (3.2), one end of the cooling liquid outer channel (3.2) connected with the liquid cooling electrode (2) is communicated with the liquid outlet (2.2), and one end connected with the liquid cooling jack (1) is communicated with the communicating cavity (1.1); the utility model discloses a cooling device, including software wire (3.3), cooling liquid electrode (2), one end that the software wire (3.3) are cavity software wire, and inside runs through and is provided with coolant liquid inner tube (3.4), and the inner chamber of coolant liquid inner tube (3.4) is coolant liquid inner channel (3.1), the one end that coolant liquid inner channel (3.1) and liquid cooling electrode (2) are connected communicates with inlet (2.1), and the one end of being connected with liquid cooling jack (1) communicates with intercommunication chamber (1.1).

3. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 2, characterized in that: liquid cooling jack (1) is the axle form, and one end is for the jack end (1.2) that correspond the grafting with the rifle terminal that charges, and the other end is link (1.3) of being connected with liquid cooling cable (3), is equipped with intercommunication chamber (1.1) at the terminal surface of link (1.3), and semicircle pressfitting has software wire (3.3) on the inner wall of intercommunication chamber (1.1), has cup jointed insulating sleeve (3.5) on the outer face of cylinder of link (1.3).

4. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 3, characterized in that: the communication cavity (1.1) extends towards the jack end (1.2) and is sealed in the outer wall of the jack end (1.2).

5. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 3 or 4, characterized in that: the cooling device is characterized in that an annular flow dividing sleeve (1.11) is arranged in the communicating cavity (1.1), the communicating cavity (1.1) is divided into an inner cavity and an outer cavity by the annular flow dividing sleeve (1.11), wherein the inner cavity (1.12) is communicated with the cooling liquid inner channel (3.1), the outer cavity (1.13) is communicated with the cooling liquid outer channel (3.2), and the inner cavity (1.12) and the outer cavity (1.13) are communicated at the position, close to the jack end (1.2), of the communicating cavity (1.1).

6. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 5, characterized in that: the inner cavity (1.12) is connected with a jack guide pipe (1.4) close to the connecting end (1.3) in a sealing mode, the outer diameter of the jack guide pipe (1.4) is smaller than the inner diameter of the communicating cavity (1.1), and the jack guide pipe (1.4) extends out of the connecting end (1.3) and is connected with the cooling liquid inner pipe (3.4) in an inserting mode.

7. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 2, characterized in that: the liquid cooling electrode (2) consists of a conical head front part and a conical hole tail part; the front part of the conical head is a shaft-shaped body with an external conical surface at one end, a through hole (2.3) is arranged at one end with the external conical surface, an electrode pipeline (2.4) communicated with the through hole (2.3) is arranged at the other end, and a liquid outlet (2.2) is arranged on the pipe wall of the electrode pipeline (2.4); the tail part of the conical hole is a shaft-shaped body, one end of the shaft-shaped body is provided with an inner conical surface corresponding to one end with an outer conical surface at the front part of the conical head and a counter bore (2.5) corresponding to the through hole (2.3), and the wall of the counter bore (2.5) is provided with a liquid inlet (2.1); the outer conical surface at the front part of the conical head is matched and attached with the inner conical surface at the tail part of the conical hole and is in threaded connection with the inner conical surface; a soft lead (3.3) is pressed on the inner tube wall of the electrode tube (2.4) in a semicircular way, an insulating sleeve (3.5) is sleeved on the outer cylindrical surface of the electrode tube (2.4), an electrode guide tube (2.6) is inserted in the through hole (2.3), the electrode guide tube (2.6) extends out of the electrode tube (2.4) and is inserted with the cooling liquid inner tube (3.4), the cooling liquid inner channel (3.1) is communicated with the liquid inlet (2.1) through the electrode guide tube (2.6) and the counter bore (2.5), and the cooling liquid outer channel (3.2) is communicated with the liquid outlet (2.2) through the electrode tube (2.4); the end of the front part of the conical head with the outer conical surface is also provided with a sealing groove, a sealing ring (2.7) is arranged in the sealing groove, and the tail part of the conical hole is provided with a sealing counter bore corresponding to the sealing ring (2.7).

8. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 2, characterized in that: the liquid cooling electrode (2) consists of a front part of a taper hole and a rear part of a taper head; the front part of the taper hole is a shaft-shaped body with an inner conical surface at one end, a through hole (2.3) is arranged at one end with the inner conical surface, an electrode pipeline (2.4) communicated with the through hole (2.3) is arranged at the other end, and a liquid outlet (2.2) is arranged on the pipe wall of the electrode pipeline (2.4); the rear part of the conical head is a shaft-shaped body, one end of the shaft-shaped body is provided with an outer conical surface corresponding to one end with an inner conical surface at the front part of the conical hole and a counter bore (2.5) corresponding to the through hole (2.3), and the wall of the counter bore (2.5) is provided with a liquid inlet (2.1); the inner conical surface at the front part of the conical hole is matched and attached with the outer conical surface at the rear part of the conical head and is in threaded connection with the conical surface; a soft lead (3.3) is pressed on the inner tube wall of the electrode tube (2.4) in a semicircular way, an insulating sleeve (3.5) is sleeved on the outer cylindrical surface of the electrode tube (2.4), an electrode guide tube (2.6) is inserted in the through hole (2.3), the electrode guide tube (2.6) extends out of the electrode tube (2.4) and is connected with the cooling liquid inner tube (3.4), the cooling liquid inner channel (3.1) is communicated with the liquid inlet (2.1) through the electrode guide tube (2.6) and the counter bore (2.5), and the cooling liquid outer channel (3.2) is communicated with the liquid outlet (2.2) through the electrode tube (2.4); the end of the rear part of the conical head with the outer conical surface is also provided with a sealing groove, a sealing ring (2.7) is arranged in the sealing groove, and the front part of the conical hole is provided with a sealing counter bore corresponding to the sealing ring (2.7).

9. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 1, characterized in that: the liquid cooling cable (3) comprises an insulating sleeve (3.5), a soft lead (3.3) penetrates through the insulating sleeve (3.5), a cooling liquid inner pipe (3.4) also penetrates through the insulating sleeve (3.5), the inner cavity of the cooling liquid inner pipe (3.4) is a cooling liquid inner channel (3.1), and the cavity between the cooling liquid inner pipe (3.4) and the insulating sleeve (3.5) is a cooling liquid outer channel (3.2); one end of the cooling liquid inner channel (3.1) connected with the liquid cooling electrode (2) is communicated with the liquid inlet (2.1), and the other end connected with the liquid cooling jack (1) is communicated with the communicating cavity (1.1); the end that outer passageway of coolant liquid (3.2) and liquid cooling electrode (2) are connected communicates with liquid outlet (2.2), and the one end that is connected with liquid cooling jack (1) communicates with intercommunication chamber (1.1).

10. The cooling method of the liquid cooling cable for the liquid cooling charging socket of the new energy electric vehicle as claimed in claim 2 or 9, characterized in that: the soft lead (3.3) is formed by twisting a plurality of strands of twisted copper wire meshes; the inner cooling liquid pipe (3.4) is a polytetrafluoroethylene pipe.