CN113192667A

CN113192667A - Electric energy transmission device and electric automobile charging system

Info

Publication number: CN113192667A
Application number: CN202110426624.XA
Authority: CN
Inventors: 林金源; 游道亮; 董冰; 丁文敏
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-07-30

Abstract

The invention provides an electric energy transmission device, which comprises a pipeline and a cooling unit, wherein the pipeline comprises a pipeline, and a first conductive terminal and a second conductive terminal which are tightly matched with two ends of the pipeline, the cooling unit is communicated with the pipeline, the pipeline of the cooling unit and the pipeline of the pipeline form a closed annular pipeline, the inner cavity of the annular pipeline is provided with conductive liquid, electric energy is transmitted in the pipeline through the conductive liquid, the conductive liquid circularly flows in the pipeline and flows through the cooling unit to realize heat exchange, so that the conductive liquid can cool the first conductive terminal and the second conductive terminal while transmitting electric energy, the cooling efficiency is improved, larger current can be safely borne, and the problem that the manufacturing process of the conventional power wire harness is complex is also solved. Still involved an electronic car charging system who adopts this electric energy transmission device, realized safely carrying out high-power charging to electric automobile, improved the flexibility of rifle cable that charges simultaneously, be favorable to easily carrying out the operation of charging.

Description

Electric energy transmission device and electric automobile charging system

Technical Field

The invention belongs to the technical field of high-power charging of electric automobiles, and particularly relates to an electric energy transmission device and an electric automobile charging system adopting the electric energy transmission device.

Background

With the development of new energy automobile technology, the requirement of a user on the charging efficiency of an electric automobile is higher and higher, and particularly, the requirement of a high-power charging technology is more and more urgent due to the network point arrangement of national highway charging piles. The cross section of the electric energy transmission device (such as a power wire harness) of the current direct current charging gun reaches 70 square millimeters, and the electric energy transmission device can only bear 250A of continuous charging current and cannot meet the transmission requirement of larger current. In order to increase the current carrying capacity of the charging device, a mode of increasing the wire diameter of a power wire harness is generally adopted; however, the power wire harness of the direct current charging gun is very heavy at present, the increase of the sectional area of the power wire harness enables the direct current charging gun cable to be thicker, harder and heavier, and the operation of plugging and unplugging the charging gun is difficult to accomplish manually.

At present, under the condition that the sectional area of a power wire harness conductor is not changed, the purpose of improving transmission current can be achieved by effectively cooling an electric energy transmission component. In the prior art, most of the electric energy transmission components are cooled by a liquid cooling device, and the electric energy transmission components in the power line bundle are cooled by insulating cooling liquid so as to achieve the purpose of improving transmission current. However, the existing liquid cooling device with many pipe joints causes the problems of complex manufacturing process, low cooling efficiency, easy overheating and the like of the power wiring harness.

Therefore, how to effectively combine high-power transmission electric energy and efficient heat dissipation and cooling together is an urgent issue to be solved.

Disclosure of Invention

In order to solve the technical problems, the invention provides an electric energy transmission device, which can realize high-power electric energy transmission through conductive liquid in a pipeline, and simultaneously, the conductive liquid circulating in the pipeline is cooled by a cooling unit and can cool a conductive terminal, thereby effectively improving the problems of complex manufacturing process, low cooling efficiency, easy overheating and the like of the traditional power wire harness.

The invention provides the following technical scheme that the electric energy transmission device comprises a pipeline and a cooling unit, wherein the pipeline comprises a pipeline, a first conductive terminal and a second conductive terminal, the first conductive terminal and the second conductive terminal are tightly matched with two ends of the pipeline, the cooling unit is communicated with the pipeline, preferably, the pipeline of the cooling unit and the pipeline of the pipeline form a closed annular pipeline, and conductive liquid is arranged in an inner cavity of the annular pipeline. The beneficial effects are that: the first conductive terminal and the second conductive terminal are subjected to high-power electric energy transmission through the conductive liquid, the electric current generates ohmic heat through the conductive liquid, the conductive liquid with the increased temperature circularly flows in the pipeline and realizes heat exchange through the cooling unit, so that the first conductive terminal and the second conductive terminal can be cooled while the conductive liquid transmits the electric energy at high power, the cooling efficiency is improved, larger electric current can be safely borne, and the problem of complex manufacturing process of the conventional power wiring harness is solved by the electric energy transmission device.

Preferably, a plurality of fins are arranged at one end of each of the first conductive terminal and the second conductive terminal, which are tightly matched with the pipeline, and the plurality of fins extend into the inner cavity of the pipeline. The beneficial effects are that: by additionally arranging the plurality of fins, the heat exchange area and the electric conduction area of the conductive liquid in the process of transmitting electric energy are increased.

Preferably, the surfaces of the first conductive terminal, the second conductive terminal and the fin are plated with anti-corrosion layers. The beneficial effects are that: the corrosion prevention layer is additionally arranged, so that the conductive liquid is prevented from corroding the surfaces of the first conductive terminal, the second conductive terminal and the fin.

Preferably, the first fin of the first conductive terminal extends toward but does not abut the second conductive terminal, isolating the conduit lumen into an inlet channel and an outlet channel; the first fin and the fin of the second conductive terminal form a backflow port, and the inflow channel and the outflow channel are communicated through the backflow port. The beneficial effects are that: the first fins are additionally arranged to divide the pipeline into the zigzag flow channels, so that the heat exchange area and the electric conduction area of the conductive liquid in the process of transmitting electric energy are increased.

Preferably, the pipe is provided with a liquid inlet communicated with the inflow channel and a liquid outlet communicated with the outflow channel, and the liquid inlet, the liquid outlet and the backflow port are respectively located at two ends of the pipe.

Preferably, the cooling unit comprises a control box, a heat exchanger, a pump and a circulating pipeline, wherein the heat exchanger comprises a radiator and a liquid storage box; the circulating pipeline connects the pipeline, the radiator, the liquid storage tank and the pump in series to form a circulating cooling loop of the conductive liquid.

Preferably, a temperature sensor is arranged at the liquid outlet end of the pipeline; the temperature sensor, the radiator and the pump are respectively electrically connected with the control box. The beneficial effects are that: through the formed circulating cooling loop of the conductive liquid and the combination of the temperature sensor, the control box controls the heat exchange rate of the heat exchanger and the flow regulation of the pump according to the temperature of the conductive liquid flowing out of the pipeline, and the temperature of the conductive liquid in the pipeline is automatically maintained within a proper range.

Preferably, the surfaces of the heat exchanger and the pump that are in contact with the electrically conductive liquid are each coated with an insulating layer.

Preferably, the circulation pipeline and the pipeline are made of insulating flexible materials.

The invention also provides an electric automobile charging system adopting the electric energy transmission device, which realizes the high-power charging of an electric automobile safely, and the charging connector is operated more conveniently, thereby being beneficial to the charging gun to charge the electric automobile easily.

The invention provides the following technical scheme that the electric automobile charging system comprises a charging connector, a cable assembly and a power supply, wherein the charging connector is provided with a coupler; two ends of the cable assembly are respectively electrically connected with the charging connector and the power supply; preferably, the electric vehicle charging system further comprises the electric energy transmission device. The beneficial effects are that: through the cooling function of the electric energy transmission device, the temperature rise of the cable assembly and the charging connector is reduced, and the safety of a high-power charging process is effectively improved.

Preferably, the cable assembly comprises a positive power wire harness and a negative power wire harness which are arranged in parallel; the positive power wire harness and the negative power wire harness both comprise the electric energy transmission device. The beneficial effects are that: through positive power pencil with the conductor of negative power pencil by conducting liquid replaces the copper wire that the diameter is big, hardness is big, is showing and improves cable subassembly's flexibility realizes operating more lightly charging connector does benefit to the rifle that charges and easily charges the operation to electric automobile.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an electric vehicle charging system according to an embodiment of the present invention;

fig. 2 is a partial schematic structural view of a charging connector and cable assembly provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an electric energy transmission device (without a cooling unit) provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an electric energy transmission device according to an embodiment of the present invention;

FIG. 5 is a perspective view of a pipeline provided by an embodiment of the present invention;

FIG. 6 is a front view of a pipeline provided by an embodiment of the present invention;

FIG. 7 is a sectional view taken along line A of FIG. 6;

FIG. 8 is a sectional view taken along line B of FIG. 6;

FIG. 9 is a cross-sectional view taken along line C of FIG. 6;

fig. 10 is a schematic structural diagram of a cooling unit according to an embodiment of the present invention.

Description of reference numerals:

1-electrical connector, 11-coupler;

2-a cable assembly, 2 a-a positive functional wire harness and 2 b-a negative functional wire harness;

20-an electric energy transmission device;

21-pipeline, 211-pipeline, 2111-inflow channel, 2112-outflow channel, 2113-reflux port, 2114-liquid inlet, 2115-liquid outlet, 212-first conductive terminal, 2121-fin, 2122-first fin and 213-second conductive terminal;

22-cooling unit, 221-control box, 222-heat exchanger, 2221-radiator, 2222-liquid storage box, 223-pump, 224-circulation pipeline, 225-temperature sensor;

23-a conductive liquid;

3-power supply.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In one embodiment of the present invention, as shown in fig. 1, an electric vehicle charging system includes a charging connector 1, a cable assembly 2, and a power source 3. In this embodiment, two ends of the cable assembly 2 are electrically connected to the charging connector 1 and the power supply 3, respectively; specifically, the charging connector 1 is provided with a coupler 11, the coupler 11 has a shape element allowing connection to a charging interface of an electric vehicle, and the charging connector 1 is coupled with the charging interface of the electric vehicle through the coupler 11 to realize communication and power transmission.

As shown in fig. 2 and 3, the electric vehicle charging system further includes a power transmission device 20. In this embodiment, the cable assembly 2 includes a positive power harness 2a and a negative power harness 2b that are arranged in parallel, and both the positive power harness 2a and the negative power harness 2b include the electric energy transmission device 20.

As shown in fig. 4, the power transmission device 20 includes a pipeline 21 and a cooling unit 22. In this embodiment, the pipeline 21 includes a pipe 211, and a first conductive terminal 212 and a second conductive terminal 213 closely fitted to two ends of the pipe; preferably, the pipe 211 is made of an insulating flexible material, which is aimed at preventing loss of electric energy and electric shock. Specifically, the first conductive terminal 212 is a power coupling terminal coupled to the power source 3, and the second conductive terminal 213 is a charging connector coupling terminal coupled to the charging connector 1.

Further, the electric energy transmission device 20 further includes a conductive liquid 23, preferably, the conductive liquid 23 is made of mercury, which has good conductivity and good flowability; furthermore, the cooling unit 22 is conducted with the pipe 211, the pipe of the cooling unit 22 and the pipe of the pipe 211 form a closed annular pipe, and the inner cavity of the annular pipe is provided with the conductive liquid 23. The conductive liquid 23 circulates between the pipe 211 and the cooling unit 22, and the conductive liquid 23 serves as a conductor in a parallel state to realize the electric energy transmission between the first conductive terminal 212 and the second conductive terminal 213, that is, the electric energy transmission between the power coupling terminal and the charging connector coupling terminal. Specifically, the electric energy of the power supply 3 is transmitted to the charging connector 1 through a power supply coupling terminal, the conductive liquid 23 and a charging connector coupling terminal in sequence, so as to continuously charge the electric vehicle connected with the charging connector 1; therefore, the conductors of the positive power wire harness 2a and the negative power wire harness 2b in the cable assembly 2 are formed by replacing copper wires with large diameters and hardness with the conductive liquid 23, so that the flexibility of the cable assembly 2 is remarkably improved, the charging connector 1 can be operated more conveniently, and the charging operation of the electric automobile can be easily performed.

As shown in fig. 5, 6 and 7, a plurality of fins 2121 are disposed at one end of each of the first conductive terminal 212 and the second conductive terminal 213 tightly fitting the tube 211, and the fins 2121 extend into the inner cavity of the tube 211; due to the arrangement of the plurality of fins 2121, the heat exchange area and the electric conduction area between the first conductive terminal 212 and the conductive liquid 23 and between the second conductive terminal 213 and the conductive liquid are effectively increased, and the heat exchange efficiency and the electric conduction capability are improved. Preferably, the plurality of fins 2121 and the conductive terminal 212 are integrally formed, so as to reinforce the strength of the fins 2121; furthermore, since the conductive liquid 23 has a conductive property, and has a certain corrosiveness to the first conductive terminal 212, the second conductive terminal 213 and the fin 2121 made of metal, in order to prolong the service life of the first conductive terminal 212 and the second conductive terminal 213, a corrosion-resistant layer with good conductivity may be plated on the surfaces of the first conductive terminal 212, the second conductive terminal 213 and the fin 2121 to prevent corrosion.

As shown in fig. 7, 8 and 9, the first fin 2122 of the first conductive terminal 212 extends toward, but does not abut, the second conductive terminal 213, separating the interior cavity of the tube 211 into an inlet channel 2111 and an outlet channel 2112. Preferably, the first fin 2122 and the fin of the second conductive terminal 213 form a backflow port 2113, and the inflow channel 2111 and the outflow channel 2112 are communicated through the backflow port 2113. Furthermore, the tube 211 is provided with a liquid inlet 2114 communicated with the inflow channel 2111 and a liquid outlet 2115 communicated with the outflow channel 2112. Specifically, the flow path of the conductive liquid 23 in the pipeline 21 is: the conductive liquid 23 enters through the liquid inlet 2114, flows through the inflow channel 2111, enters the outflow channel 2112 through the backflow port 2113, and finally flows out through the liquid outlet 2115, so that the conductive liquid 23 is prevented from directly flowing from the liquid inlet 2114 to the liquid outlet 2115, the retention time of the conductive liquid 23 in the pipeline 21 is effectively prolonged, the heat exchange area and the electric conduction area of the conductive terminal 212 and the conductive liquid 23 are further increased, and the heat exchange efficiency and the electric conduction capability of the electric energy transmission device 20 are enhanced.

In order to further prolong the residence time of the conducting liquid 23 in the pipeline 21, in this embodiment, the liquid inlet 2114, the liquid outlet 2115 and the liquid return 2113 are respectively located at two ends of the pipe 211.

As shown in fig. 10, the cooling unit 22 includes a control box 221, a heat exchanger 222, a pump 223, and a circulation line 224. In order to prevent the loss of the electrically-charged conductive liquid 23 in the cooling unit 22 and the occurrence of electric shock, in this embodiment, the circulation pipeline 224 is made of an insulating flexible material, and the surfaces of the heat exchanger 222 and the pump 223, which are in contact with the conductive liquid 23, are coated with an insulating layer. Further, the heat exchanger 222 includes a radiator 2221 and a liquid storage box 2222, and the circulation pipeline 224 connects the pipeline 211, the radiator 2221, the liquid storage box 2222 and the pump 223 in series to form a circulation cooling loop of the conductive liquid 23. Specifically, the conductive liquid 23 after temperature rise flows out from the liquid outlet 2225, enters the liquid storage tank 2222 through cooling of the heat sink 2221, and the cooled conductive liquid 23 is pumped to the liquid inlet 2114 through the pump 223, so that the pipeline 21 is filled with the conductive liquid 23 and the circulating flow of the conductive liquid 23 is maintained, which plays a role in further cooling the conductive terminal 212.

Further, a temperature sensor 225 is arranged at the liquid outlet end of the pipeline 211. In this embodiment, the temperature sensor 225, the radiator 2221 and the pump 223 are electrically connected to the control box 221; specifically, the temperature sensor 225 senses the conducting liquid 23 from the liquid outlet 2115 in real time, and the control box 221 controls the heat exchange rate of the heat exchanger 222 and the flow rate regulation of the pump according to the monitored temperature of the conducting liquid 23, so as to automatically maintain the temperature of the conducting liquid 23 in the pipeline 211 within a proper range, thereby further effectively improving the safety of the high-power charging process.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The electric energy transmission device is characterized in that the pipeline of the cooling unit and the pipeline of the pipeline form a closed annular pipeline, and an inner cavity of the annular pipeline is provided with conductive liquid.

2. The power transmission device of claim 1, wherein the first and second conductive terminals each have a plurality of fins at one end that is in close fit with the conduit, the plurality of fins extending into the inner cavity of the conduit; and the surfaces of the first conductive terminal, the second conductive terminal and the fin are plated with anti-corrosion layers.

3. The electrical power transmission device of claim 2, wherein the first fin of the first conductive terminal extends toward, but does not abut, the second conductive terminal, isolating the conduit lumen into an inlet channel and an outlet channel; the first fin and the fin of the second conductive terminal form a backflow port, and the inflow channel and the outflow channel are communicated through the backflow port.

4. The power transmission device according to claim 3, wherein the pipe has a liquid inlet communicating with the inflow channel and a liquid outlet communicating with the outflow channel, and the liquid inlet, the liquid outlet and the return port are respectively located at two ends of the pipe.

5. The power transfer device of claim 1, wherein the cooling unit comprises a control box, a heat exchanger, a pump, and a circulation line, the heat exchanger comprising a radiator and a reservoir; the circulating pipeline connects the pipeline, the radiator, the liquid storage tank and the pump in series to form a circulating cooling loop of the conductive liquid.

6. The power transmission device of claim 5, wherein the outlet end of the conduit is provided with a temperature sensor; the temperature sensor, the radiator and the pump are respectively electrically connected with the control box.

7. The electrical energy transfer device of claim 5, wherein the surfaces of the heat exchanger and the pump that contact the electrically conductive liquid are each coated with an insulating layer.

8. The power transfer device of claim 5, wherein the circulation line and the conduit are made of an insulating flexible material.

9. An electric vehicle charging system comprises a charging connector, a cable assembly and a power supply, wherein a coupler is arranged on the charging connector; two ends of the cable assembly are respectively electrically connected with the charging connector and the power supply; an electric energy transmission device according to any one of claims 1 to 8.

10. The electric vehicle charging system of claim 9, wherein the cable assembly comprises a positive power harness and a negative power harness arranged in parallel; the positive power wire harness and the negative power wire harness both comprise the electric energy transmission device.