Liquid-cooled charging pile

Abstract

The invention provides a liquid-cooled charging pile, and relates to the technical field of charging piles, the liquid-cooled charging pile comprises a box body, a phase change heat exchanger and a first circulating pump, a charging module is arranged in the box body, and the box body is filled with an insulating cooling liquid; a liquid inlet of the phase change heat exchanger is communicated with the box body; one end of the first circulating pump is communicated with a liquid outlet of the phase change heat exchanger, and the other end of the first circulating pump is communicated with the box body; the charging module is arranged in the box body, the box body is filled with the insulating cooling liquid, and under the circulating action of the first circulating pump, heat generated by the charging module can be continuously led out and stored in a phase change material of the phase change heat exchanger, so that the charging module is prevented from working for a long time in a high-temperature environment; therefore, the safety of the charging process and the high-efficiency and stable charging efficiency are ensured, and the charging device is especially suitable for occasions with high charging power, such as a fast charging pile and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a liquid-cooled charging pile. Background Art

[0002] With the progress of technology, the market scale of electric vehicles has experienced explosive growth, and the demand for charging piles has also increased year-on-year. Due to the large charging power and fast charging speed of ultra-fast charging piles, their market demand is greater than that of ordinary charging piles.

[0003] The working principle of a charging pile is to convert the alternating current input from the power grid into direct current with adjustable voltage and current, and then charge the battery pack in the electric vehicle. Under high voltage and large current, a large amount of heat will be generated by the power devices and charging cables inside the pile body, causing the temperature of the charging pile to rise sharply. This phenomenon is more obvious in ultra-fast charging piles. At present, it takes at least 30 minutes to charge a household new energy electric vehicle to 80%, mainly limited by the heat generation problem at the conductor and terminal during long-time charging with large current. Excessive local temperature will cause the device function to decrease or even fail, and may also cause safety accidents such as ignition of flammable materials, forcing the charging pile to perform current limiting when the temperature rises. This situation greatly limits the charging efficiency and increases the charging time of the vehicle. Summary of the Invention

[0004] The purpose of the present invention is to provide a liquid-cooled charging pile to solve the problems existing in the prior art, which can avoid the charging module working for a long time in a high-temperature environment, resulting in a decrease in working efficiency or even a fire, and ensure the safety of the charging process and the high efficiency and stability of the charging efficiency.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] A liquid-cooled charging pile includes a box body, a phase change heat exchanger, and a first circulation pump. A charging module is arranged inside the box body, and the box body is filled with insulating coolant; the liquid inlet of the phase change heat exchanger is communicated with the box body; one end of the first circulation pump is communicated with the liquid outlet of the phase change heat exchanger, and the other end is communicated with the box body.

[0007] As an embodiment, it further includes a charging cable communicatively connected to the charging module. A charging gun for connecting to an electric vehicle battery pack is provided at an end of the charging cable. A power core wire and a coolant return pipeline are provided inside the charging cable. The power core wire is communicatively connected to the charging module. The radial cross-section of the power core wire is an annular structure. A coolant inlet pipeline is provided inside the annular structure. The inlet end of the coolant inlet pipeline is communicated with the box body. The outlet end of the coolant inlet pipeline is communicated with the inlet end of the coolant return pipeline. The outlet end of the coolant return pipeline is communicated with the box body through a second circulation pump.

[0008] As an embodiment, an air-cooled radiator is further provided between the outlet end of the coolant return pipeline and the second circulation pump.

[0009] As an embodiment, the inner wall of the coolant inlet pipeline has a turbulence structure for disturbing the coolant.

[0010] As an embodiment, the charging cable includes a sheath. The power core wire, the coolant return pipeline, a ground wire, and an auxiliary power core wire are provided inside the sheath. The ground wire and the auxiliary power core wire are both communicatively connected to the charging module.

[0011] As an embodiment, a first control core wire and a second control core wire, both communicatively connected to the charging module, are further provided inside the sheath. A temperature sensor for monitoring the temperature of the charging cable is provided at an end of the first control core wire. The second control core wire is connected to the charging gun and is used to control the on / off of the charging process.

[0012] As an embodiment, the power core wire is located in the middle of the sheath. The first control core wire and the second control core wire are located on one side of the power core wire. The auxiliary power core wire and the ground wire are located on the other side of the power core wire.

[0013] As an embodiment, it further includes a pile body. The box body, the air-cooled radiator, the first circulation pump, the second circulation pump, and the phase change heat exchanger are provided inside the pile body.

[0014] As an embodiment, a leakage circuit breaker, a contactor, a DC output component, a surge protector, a display screen controller, a card reader, and a charging indicator light are further provided inside the pile body.

[0015] As an embodiment, the coolant is perfluoropolyether.

[0016] The technical effects of the present invention relative to the prior art are as follows:

[0017] In the present invention, the charging module is arranged in a box body, and the box body is filled with insulating coolant. Under the circulation action of the first circulation pump, the heat generated by the charging module can be continuously drawn out and stored in the phase change material of the phase change heat exchanger, avoiding the problems that the charging module works for a long time in a high-temperature environment, resulting in a decrease in working efficiency or even a fire, ensuring the safety of the charging process and the high efficiency and stability of the charging efficiency, and is particularly suitable for occasions with large charging power such as fast charging piles.

[0018] The other technical solutions in the present invention have the following technical effects compared with the prior art:

[0019] 1. In the present invention, a coolant inlet pipeline is arranged inside the power core wire, so that the contact area between the coolant and the power core wire is larger, the heat transfer efficiency is higher, and the heat generated by the charging cable can be quickly taken out, avoiding the problems that the resistance increases due to the too high temperature of the charging cable, reducing the charging efficiency, and even causing the combustion of combustibles around the power core wire;

[0020] 2. The inner wall of the coolant inlet pipeline in the present invention has a turbulence structure for disturbing the coolant. The turbulence structure makes the coolant in the coolant inlet pipeline generate turbulence, turbulent flow and mixing, thereby improving the convective heat transfer effect between the coolants inside the coolant inlet pipeline, and can further improve the heat transfer efficiency between the coolant and the power core wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the cooling principle of a liquid-cooled charging pile in an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the radial structure of a charging cable in an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the inner wall structure of a cooling inlet pipeline in an embodiment of the present invention;

[0025] Figure 4 For Figure 3 The axial view schematic diagram;

[0026] Figure 5 It is a schematic diagram of the structure of a liquid-cooled charging pile in an embodiment of the present invention.

[0027] Description of the reference numerals:

[0028] 1. Cabinet; 2. Phase change heat exchanger; 3. First circulation pump; 4. Charging module; 5. Charging gun; 6. Power core wire; 7. Coolant return pipeline; 8. Coolant inlet pipeline; 9. Second circulation pump; 10. Air-cooled radiator; 11. Turbulence structure; 12. Sheath; 13. Ground wire; 14. Auxiliary power core wire; 15. First control core wire; 16. Second control core wire; 17. Pile body; 18. Leakage circuit breaker; 19. Contactor; 20. DC output component; 21. Surge protector; 22. Display screen controller; 23. Card reader; 24. Charging indicator light; 25. Temperature sensor; 26. PTC thermistor. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The purpose of the present invention is to provide a liquid-cooled charging pile to solve the problems existing in the prior art, which can avoid the charging module working for a long time in a high-temperature environment, resulting in a decrease in working efficiency or even a fire, and ensure the safety of the charging process and the high efficiency and stability of the charging efficiency.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0032] As Figures 1 to 5 shown, this embodiment provides a liquid-cooled charging pile, including a cabinet 1, a phase change heat exchanger 2, and a first circulation pump 3. A charging module 4 is arranged in the cabinet 1, and the cabinet 1 is filled with insulating coolant, such as deionized water or perfluoropolyether; the inlet of the phase change heat exchanger 2 is communicated with the cabinet 1; one end of the first circulation pump 3 is communicated with the outlet of the phase change heat exchanger 2, and the other end is communicated with the cabinet 1. The first circulation pump 3 is used to provide power for the circulation of the coolant. The phase change heat exchanger 2 includes a circulation pipeline and a phase change material, and the phase change material can exchange heat with the circulation medium in the circulation pipeline and store the heat. The phase change heat exchanger 2 is a commonly used device in the art, and the specific structure thereof will not be described in detail in this embodiment.

[0033] During use, the charging module 4 is used to control the delivery of current and the normal operation of other electrical components in the charging pile. When used for a long time, the charging module 4 generates a large amount of heat. The coolant takes out this part of the heat and exchanges heat with the phase change material in the phase change heat exchanger 2. The phase change material absorbs heat and undergoes a phase change, reducing the temperature of the coolant. The coolant continuously takes out the heat generated by the charging module 4 under the action of the first circulation pump 3, achieving the purpose of cooling the charging module 4. When in the cold season and the charging pile is just started, the temperature of the charging module 4 is relatively low, and the phase change material can release heat, enabling the charging module 4 to quickly reach the appropriate working temperature and improving the charging efficiency.

[0034] Therefore, in this embodiment, by arranging the charging module 4 in the box body 1 and filling the box body 1 with insulating coolant, under the circulating action of the first circulation pump 3, the heat generated by the charging module 4 can be continuously led out and stored in the phase change material of the phase change heat exchanger 2, avoiding the problem that the charging module 4 works for a long time in a high-temperature environment, resulting in a decrease in working efficiency or even a fire, ensuring the safety of the charging process and the high-efficiency and stable charging efficiency, especially suitable for occasions with large charging power such as fast-charging charging piles.

[0035] As Figure 2 shown, this embodiment also includes a charging cable communicatively connected to the charging module 4. A charging gun 5 for connecting to an electric vehicle battery pack is provided at the end of the charging cable. A power core wire 6 and a coolant return pipeline 7 are arranged in the charging cable. The power core wire 6 is communicatively connected to the charging module 4. The radial cross-section of the power core wire 6 is an annular structure. A coolant inlet pipeline 8 is arranged inside the annular structure. The inlet end of the coolant inlet pipeline 8 is communicated with the box body 1, the outlet end of the coolant inlet pipeline 8 is communicated with the inlet end of the coolant return pipeline 7, and the outlet end of the coolant return pipeline 7 is communicated with the box body 1 through a second circulation pump 9. The power core wire 6 is the core part responsible for power transmission. Its main function is to directly connect the charging pile and the battery pack of the electric vehicle and is responsible for efficiently transmitting alternating current (AC) or direct current (DC) power to the battery pack. In a fast-charging scenario, the power core wire 6 needs to carry a current of up to several hundred amperes (such as more than 200A in direct current fast charging). By arranging the coolant inlet pipeline 8 inside the power core wire 6, the contact area between the coolant and the power core wire 6 is larger, the heat transfer efficiency is higher, and the heat generated by the charging cable can be quickly taken out, avoiding the problem that the resistance increases due to the overheating of the charging cable, reducing the charging efficiency, and even causing the ignition of combustibles around the power core wire 6.

[0036] In this embodiment, an air-cooled radiator 10 is further provided between the liquid outlet end of the coolant return pipeline 7 and the second circulation pump 9. The air-cooled radiator 10 includes a fan and a coil pipe. The coolant flows through the coil pipe. After passing through the power core wire 6, the temperature of the coolant rises. When flowing through the air-cooled radiator 10, the fan blows out the hot air around the coil pipe, and the outside cold air refills around the coil pipe to air-cool the coil pipe and the coolant inside it, so as to further reduce the temperature of the coolant and avoid the decrease of the cooling capacity of the coolant due to the high temperature of the coolant after long-term heat exchange.

[0037] As Figure 3 , Figure 4 shown, in this embodiment, the inner wall of the coolant inlet pipeline 8 has a flow disturbance structure 11 for disturbing the flow of the coolant. The flow disturbance structure 11 causes the coolant in the coolant inlet pipeline 8 to have flow disturbance, turbulence and mixing, thereby improving the heat exchange effect between the coolants inside the coolant inlet pipeline 8 and further improving the heat exchange efficiency between the coolant and the power core wire 6. Specifically, the flow disturbance structure 11 can be a convex or groove structure.

[0038] Of course, a flow disturbance structure 11 can also be provided inside the coolant return pipeline 7 to improve the uniformity of the internal temperature of the coolant.

[0039] In this embodiment, the charging cable includes a sheath 12. Inside the sheath 12, there are arranged a power core wire 6, a coolant return pipeline 7, a ground wire 13 and an auxiliary power core wire 14. Both the ground wire 13 and the auxiliary power core wire 14 are communicatively connected to the charging module 4. A filling material is also arranged in the sheath 12. The filling material cooperates with multiple cables to form a composite cable with an approximately circular cross-section, which is convenient for maintaining the cylindrical structure of the sheath 12. Specifically, the filling material is a flame-retardant high-strength PP rope (polypropylene rope), and its tensile strength reaches 50 N·mm -2 , with good flame retardancy and anti-bending ability. The material of the sheath 12 is thermoplastic polyurethane elastomer, which has the characteristics of high wear resistance and good tear resistance, and its tensile strength reaches 43 MPa.

[0040] In this embodiment, a first control core wire 15 and a second control core wire 16, both communicatively connected to the charging module 4, are further arranged inside the sheath 12. A temperature sensor 25 for monitoring the temperature of the charging cable is arranged at the end of the first control core wire 15; the temperature sensor 25 is communicatively connected to the charging module 4 through the first control core wire 15 to real-time feedback the working temperature of the charging cable. When the temperature of the charging cable reaches a certain range, the charging module 4 can increase the circulation speed of the first circulation pump 3 and the second circulation pump 9 to improve the heat exchange effect. The second control core wire 16 is connected to the charging gun 5 and is used to control the on-off of the charging process.

[0041] In this embodiment, the power core wire 6 is located in the middle of the sheath 12. The first control core wire 15 and the second control core wire 16 are located on one side of the power core wire 6, and the auxiliary power core wire 14 and the ground wire 13 are located on the other side of the power core wire 6. The coolant return pipe 7 can be located on the side where the first control core wire 15 and the second control core wire 16 are located.

[0042] This embodiment further includes a pile body 17, in which a box body 1, an air-cooled radiator 10, a first circulation pump 3, a second circulation pump 9, and a phase change heat exchanger 2 are arranged. The charging cable can be stored in the pile body 17, and its end is connected to the charging gun 5. The charging gun 5 is usually arranged on the pile body 17.

[0043] As Figure 5 shown, in this embodiment, a PTC (Positive Temperature Coefficient) thermistor 26, a leakage circuit breaker 18, a contactor 19, a DC output component 20, a surge protector 21, a display screen controller 22, a card reader 23, and a charging indicator 24 are also arranged in the pile body 17. The PTC thermistor 26 is used for overheat protection; the leakage circuit breaker 18 and the contactor 19 are used to ensure electrical safety; the DC output component 20 is used to convert alternating current into direct current; the surge protector 21 ensures the safe and stable operation of the system by quickly discharging or limiting abnormally high voltage / current; the display screen controller 22 includes a display screen and a control board. The display screen is exposed outside the pile body 17, and the control board is communicatively connected to the charging module 4 for displaying the current working state of the charging pile on the display screen. The charging indicator 24 is used to represent the current charging state. For example, when the red light of the charging indicator 24 is on, it indicates that charging is in progress, and when the green light is on, it indicates that charging is completed. The card reader 23 can be used to read the card information of the user, such as a stored value card. The above components are all common devices in the art and are used to maintain the normal operation of the charging pile. The detailed structures of the components are not described in this embodiment.

[0044] Adaptations made according to actual needs are within the protection scope of the present invention.

[0045] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A liquid-cooled charging pile, characterized in that, Comprising: A box body, a charging module is arranged inside the box body, and the box body is filled with insulating coolant; A phase change heat exchanger, an inlet of the phase change heat exchanger is communicated with the box body; And a first circulation pump, one end of the first circulation pump is communicated with an outlet of the phase change heat exchanger, and the other end is communicated with the box body.

2. The liquid-cooled charging pile according to claim 1, wherein It further includes a charging cable communicatively connected to the charging module, a charging gun for connecting to an electric vehicle battery pack is arranged at an end of the charging cable, a power core wire and a coolant return pipeline are arranged inside the charging cable, the power core wire is communicatively connected to the charging module, a radial cross-section of the power core wire is an annular structure, a coolant inlet pipeline is arranged inside the annular structure, an inlet end of the coolant inlet pipeline is communicated with the box body, an outlet end of the coolant inlet pipeline is communicated with an inlet end of the coolant return pipeline, and an outlet end of the coolant return pipeline is communicated with the box body through a second circulation pump.

3. The liquid-cooled charging pile according to claim 2, wherein, An air-cooled radiator is further arranged between an outlet end of the coolant return pipeline and the second circulation pump.

4. The liquid-cooled charging pile according to claim 2, wherein An inner wall of the coolant inlet pipeline has a flow disturbance structure for disturbing the coolant.

5. The liquid-cooled charging pile according to claim 2, characterized in that, The charging cable includes a sheath, the power core wire, the coolant return pipeline, a ground wire and an auxiliary power core wire are arranged inside the sheath, and both the ground wire and the auxiliary power core wire are communicatively connected to the charging module.

6. The liquid-cooled charging pile according to claim 5, wherein A first control core wire and a second control core wire both communicatively connected to the charging module are further arranged inside the sheath, a temperature sensor for monitoring the temperature of the charging cable is arranged at an end of the first control core wire; the second control core wire is connected to the charging gun and is used for controlling the on-off of the charging process.

7. The liquid-cooled charging pile according to claim 6, wherein The power core wire is located in the middle of the sheath, the first control core wire and the second control core wire are located on one side of the power core wire, and the auxiliary power core wire and the ground wire are located on the other side of the power core wire.

8. The liquid-cooled charging pile according to claim 3, characterized in that, It further includes a pile body, and the box body, the air-cooled radiator, the first circulation pump, the second circulation pump and the phase change heat exchanger are arranged inside the pile body.

9. The liquid-cooled charging pile according to claim 8, wherein, A leakage circuit breaker, a contactor, a DC output component, a surge protector, a display screen controller, a card reader and a charging indicator light are further arranged inside the pile body.

10. The liquid-cooled charging pile according to claim 1, characterized in that, The coolant is perfluoropolyether.

Images