Dual circulation cooling system for charging device

Abstract

The utility model discloses a double-circulation cooling system for a charging device. The dual-circulation cooling system comprises an external cooling circulation device, a first heat management part and a second heat management part, a cooling assembly of the external cooling circulation device can continuously output low-temperature cooling liquid; the first heat management part is installed in a cable of the charging device, and the input end and the output end of the first heat management part communicate with the output end of a first liquid supply assembly and the input end of a first liquid return assembly of an external cooling circulation device correspondingly, so that the cable is cooled in an independent circulation mode. The second heat management part is installed in a charging gun of the charging device, and the input end and the output end of the second heat management part communicate with the output end of a second liquid supply assembly and the input end of a second liquid return assembly of the external cooling circulation device correspondingly, so that the charging gun is cooled in an independent circulation mode. According to the utility model, both the cable and the charging gun can be well cooled, and the use is safe.

Description

Technical Field

[0001] The utility model relates to the field of electrical cooling, in particular to a double-circulation cooling system for a charging device. Background Art

[0002] In order to shorten the charging time of electric vehicles, high-power DC charging is currently used, but the temperature of cables and electronic components rises rapidly, which can cause failure or even burn. Therefore, a cooling system for charging cables and charging guns is developed to transfer the generated heat and keep the cables and charging guns running at a safe temperature.

[0003] At present, a single-loop cooling system is usually used: that is, the coolant flows through the heat exchange part of the cable and the charging gun in turn, and the liquid first performs the first heat exchange with the power line in the cable to take away the heat of the power line. The heated liquid continues to perform a second heat exchange with the charging gun terminal. After being heated twice, the liquid returns to the external cooling device again to form a cooling cycle. Its defects are: First, the coolant receives most of the energy in the cable and becomes a high-temperature liquid, and the temperature difference between the high-temperature liquid entering the charging gun and the charging gun load is small, making it difficult to cool the charging gun well. The temperature of the charging gun remains at the highest value in the entire system, affecting the life and safety of the terminals in the charging gun; second, if the liquid in the cable is blocked, the liquid at the charging gun terminal cannot flow back, and the temperature will increase instantly, affecting the charging safety. Utility Model Content

[0004] In order to solve one or more of the above problems, the utility model provides a dual-circulation cooling system for a charging device.

[0005] According to one aspect of the utility model, the dual-circulation cooling system for a charging device includes: an external cooling circulation device, a first thermal management unit, and a second thermal management unit;

[0006] The output end of the cooling component of the external cooling circulation device is respectively connected to the input end of the first liquid supply component and the input end of the second liquid supply component, and its input end is respectively connected to the output end of the first liquid return component and the output end of the second liquid return component, and the cooling component can continuously output low-temperature cooling liquid;

[0007] The first thermal management unit is installed in the cable of the charging device, the input end of the first thermal management unit is connected to the output end of the first liquid supply component and the output end thereof is connected to the input end of the first liquid return component, so as to independently circulate and cool the cable;

[0008] The second thermal management unit is installed in the charging gun of the charging device. The input end of the second thermal management unit is connected to the second liquid supply component and the output end is connected to the second liquid return component, so as to independently circulate and cool the charging gun.

[0009] In some embodiments, the diameter of the first liquid supply pipe of the first liquid supply assembly and the diameter of the second liquid supply pipe of the second liquid supply assembly are respectively set according to their respective cooling loads.

[0010] In some embodiments, the diameter of the first liquid supply pipe and the diameter of the second liquid supply pipe are respectively proportional to their respective cooling loads.

[0011] In some embodiments, the first liquid supply assembly includes a first liquid supply connection port, a liquid supply temperature monitor, and a first liquid supply pipe, wherein the inner end of the first liquid supply pipe is connected to the output end of the cooling assembly and the outer end is connected to the first liquid supply connection port, and the first liquid supply connection port is connected to the input end of the first thermal management unit;

[0012] Or the second liquid supply component includes a second liquid supply connection port, a liquid supply temperature monitor and a second liquid supply pipe, the inner end of the second liquid supply pipe is connected to the output end of the cooling component and the outer end is connected to the second liquid supply connection port, and the second liquid supply connection port is connected to the input end of the second thermal management part.

[0013] In some embodiments, the supply liquid temperature monitor of the first liquid supply assembly and the supply liquid temperature monitor of the second liquid supply assembly are the same sensor.

[0014] In some embodiments, the inner end of the first liquid return pipe of the first liquid return assembly is connected to the input end of the cooling assembly and the outer end is connected to the first liquid return connection port, the first liquid return connection port is connected to the output end of the first thermal management unit, and the first flow detection sensor and the first liquid return temperature detector are arranged in the first liquid return pipe;

[0015] Or the inner end of the second liquid return pipe of the second liquid return component is connected to the input end of the cooling component and the outer end is connected to the second liquid return connection port, the second liquid return connection port is connected to the output end of the second thermal management unit, and the second flow detection sensor and the second liquid return temperature detector are arranged in the second liquid return pipe.

[0016] In some embodiments, the supply liquid temperature monitor, the first return liquid temperature detector, and the second return liquid temperature detector are PT1000 resistors or NTC resistors.

[0017] In some embodiments, the first liquid supply connection port, the second liquid supply connection port, the first liquid return connection port, and the second liquid return connection port are leak-proof joints.

[0018] In some embodiments, a cooling component is disposed in the charging pile, and the cooling component includes a heat dissipation component, a cold storage box, and connecting pipelines.

[0019] In some embodiments, the first thermal management portion includes a liquid passage disposed within the cable;

[0020] The second heat management portion includes a coolant channel disposed in the charging gun.

[0021] The dual-circulation cooling system for the charging device realizes independent cooling of the charging gun and the cable through two independent cooling circuits. Its beneficial effects are: first, by adopting the dual-circulation cooling system, low-temperature coolant enters the charging gun and the cable, which solves the contradiction between the heat and temperature of the charging cable and the charging gun. The coolant temperature and flow rate of the two can be configured according to the temperature of the cable and the temperature of the charging gun, respectively, to achieve a good cooling effect, ensure that the cable and the charging gun can get good heat exchange, and ensure the safety of the cable and the charging gun; second, compared with the single-circulation system, it avoids the blockage of the liquid in the first thermal management part or the second thermal management part, causing the entire cooling system to fail and be unable to cool, increasing the safety of the charging device and improving its service life; by allocating different pipe diameters to different loads, compared with the single cooling circuit of the prior art, a better cooling effect can be achieved for the cable and the charging gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a dual-circulation cooling system for a charging device according to an embodiment of the utility model (I);

[0023] Figure 2 for Figure 1 A schematic diagram showing that the pipelines of the dual-circulation cooling system are all passed through cables;

[0024] Figure 3 for Figure 1 A schematic diagram showing that some of the piping of the dual-circulation cooling system is externally located;

[0025] External cooling circulation device 1, cooling component 11, first liquid supply component 12, liquid supply temperature monitor 120, first liquid supply connection port 121, first liquid supply pipe 122, second liquid supply component 13, second liquid supply connection port 131, second liquid supply pipe 132, first liquid return component 14, first liquid return connection port 141, first flow detection sensor 142, first liquid return temperature detector 143, first liquid return pipe 144, second liquid return component 15, second liquid return connection port 151, second flow detection sensor 152, second liquid return temperature detector 153, second liquid return pipe 154;

[0026] A first thermal management unit 2; a second thermal management unit 3;

[0027] Cable 4; charging gun 5; charging pile 6. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Figures 1 to 3 A dual-circulation cooling system for a charging device according to an embodiment of the present invention is schematically shown. As shown in the figure, the device comprises: an external cooling circulation device 1, a first heat management unit 2 and a second heat management unit 3;

[0030] The external cooling circulation device 1 comprises a cooling component 11, a first liquid supply component 12, a second liquid supply component 13, a first liquid return component 14 and a second liquid return component 15. The output end of the cooling component 11 is respectively connected to the input end of the first liquid supply component 12 and the input end of the second liquid supply component 13, and its input end is respectively connected to the output end of the first liquid return component 14 and the output end of the second liquid return component 15. The cooling component 11 can continuously output low-temperature cooling liquid;

[0031] The first heat management unit 2 is installed in the cable 4 of the charging device, and the input end of the first heat management unit 2 is connected to the output end of the first liquid supply component 12 and the output end thereof is connected to the input end of the first liquid return component 14, so as to independently circulate and cool the cable 4;

[0032] The second heat management unit 3 is installed in the charging gun 5 of the charging device, the input end of the second heat management unit 3 is connected to the second liquid supply component 13 and the output end thereof is connected to the second liquid return component 15, thereby independently circulating and cooling the charging gun 5.

[0033] The external cooling circulation device 1 and the first thermal management part 2 in the cable 4 form a liquid circulation system, and the external cooling circulation device 1 and the second thermal management part 3 in the charging gun 5 form a second liquid circulation system, forming a dual-circulation cooling system, and the charging gun 5 and the cable 4 are cooled independently through two independent cooling circuits. Its beneficial effects are: first, the dual-circulation cooling system is adopted, and the liquid entering the charging gun 5 and the cable 4 is low-temperature coolant, which solves the contradiction between the heat and temperature of the charging cable and the charging gun. The temperature and flow of the coolant of the two can be configured according to the temperature of the cable and the temperature of the charging gun, respectively, to achieve a good cooling effect, ensure that the cable 4 and the charging gun 5 can get good heat exchange, and ensure the safety of the cable 4 and the charging gun 5; second, compared with the single-circulation system, it avoids the blockage of the liquid in the first thermal management part 2 or the second thermal management part 3, resulting in the failure of the entire cooling system and the inability to cool, thereby increasing the safety of the charging device and improving the service life.

[0034] Furthermore, the diameter of the first liquid supply pipe 122 of the first liquid supply assembly 12 and the diameter of the second liquid supply pipe 132 of the second liquid supply assembly 13 are independently set according to their respective cooling loads. The beneficial effect is that by allocating different pipe diameters to different loads, a better cooling effect can be achieved for the cable 4 and the charging gun 5 compared to the single cooling circuit in the prior art.

[0035] Preferably, the diameter of the first liquid supply pipe 122 and the diameter of the second liquid supply pipe 132 are respectively proportional to their respective cooling loads. The liquid supply temperature difference △T is set, and the relationship between the flow rate M and the load Q is M=3600Q / Cρ△T, C is the specific heat capacity of the cooling liquid, ρ is the density of the cooling liquid, and the relationship between the liquid supply pipe diameter D and the flow rate M is D=sqrt(4M / πv). Generally, the flow velocity v of the liquid supply pipe is between 1-3m / s, so the load is proportional to the pipe diameter. The beneficial effect is that when the charging device is stably charged, the cooling load of each part is determined, so the optimal pipe diameter can be set to achieve good cooling.

[0036] Further, the first liquid supply component 12 includes a first liquid supply connection port 121, a liquid supply temperature monitor 120 and a first liquid supply pipe 122, the inner end of the first liquid supply pipe 122 is connected to the output end of the cooling component 11 and the outer end is connected to the first liquid supply connection port 121, and the first liquid supply connection port 121 is connected to the input end of the first thermal management unit 2. Further, the second liquid supply component 13 includes a second liquid supply connection port 131, a liquid supply temperature monitor 120 and a second liquid supply pipe 132, the inner end of the second liquid supply pipe 132 is connected to the output end of the cooling component 11 and the outer end is connected to the second liquid supply connection port 131, and the second liquid supply connection port 131 is connected to the input end of the second thermal management unit 3. The beneficial effect is that the first liquid supply component 12 and the second liquid supply component 13 of the arrangement can output the cooling liquid of the set temperature well.

[0037] Preferably, the liquid supply temperature monitor 120 of the first liquid supply component 12 and the liquid supply temperature monitor 120 of the second liquid supply component 13 are the same sensor; preferably, the liquid supply temperature monitor 120 is installed at any one of the output end of the cooling component 11, the first liquid supply pipe 122, the first liquid supply connection port 121, the second liquid supply connection port 131 and the second liquid supply pipe 132. The beneficial effect is that the liquid supply temperature monitor 120 is shared, the equipment structure and the control system are simplified, and the cost can be reduced.

[0038] Further, the first liquid return component 14 includes a first liquid return connection port 141, a first flow detection sensor 142, a first liquid return temperature detector 143 and a first liquid return pipe 144, the inner end of the first liquid return pipe 144 is connected to the input end of the cooling component 11 and the outer end is connected to the first liquid return connection port 141, the first liquid return connection port 141 is connected to the output end of the first thermal management unit 2, the first flow detection sensor 142 and the first liquid return temperature detector 143 are arranged in the first liquid return pipe 144 or in the first liquid return connection port 141; Further, the second liquid return component 15 includes a second liquid return connection port 151, a second flow detection sensor 152, a second liquid return temperature detector 153 and a second liquid return pipe 154. The inner end of the second liquid return pipe 154 is connected to the input end of the cooling component 11 and the outer end is connected to the second liquid return connection port 151. The second liquid return connection port 151 is connected to the output end of the second thermal management unit 3. The second flow detection sensor 152 and the second liquid return temperature detector 153 are arranged in the second liquid return pipe 154 or in the second liquid return connection port 151. The beneficial effect is that the first liquid return component 14 and the second liquid return component 15 can perform good cooling liquid return, and monitor the temperature and speed of the cooling return liquid in real time, adjust the temperature and speed of the cooling liquid output by the cooling component 11 in real time, maintain the best cooling effect, and make the cable and the charging gun in the best use state.

[0039] Preferably, the liquid supply temperature monitor 120, the first liquid return temperature detector 143 and the second liquid return temperature detector 153 are PT1000 resistors or NTC resistors. The beneficial effect is that this selection has good temperature detection performance.

[0040] Preferably, the first liquid supply connection port 121, the second liquid supply connection port 131, the first liquid return connection port 141 and the second liquid return connection port 151 are leak-proof joints. The beneficial effect is that this option can ensure smooth flow between the external cooling circulation device and the cable and the charging gun.

[0041] Furthermore, the cooling assembly 11 includes a heat dissipation assembly, a cold storage box and a connecting pipeline. Preferably, the cooling assembly 11 is arranged in the charging pile 6. The beneficial effect is that the arrangement can protect the cooling assembly 11 and reduce the equipment footprint.

[0042] Further, the first thermal management part 2 includes a liquid pipe arranged in the cable 4, the liquid pipe includes a liquid inlet cooling section and a reflux section, the inner ends of the liquid inlet cooling section and the reflux section are connected to each other, the outer end of the liquid inlet cooling section of the liquid pipe is connected to the first liquid supply component 12, a power line is placed in the tube hole of the liquid pipe or the outer wall of the liquid pipe is sheathed with the power line, the outer end of the reflux section of the liquid pipe is directly connected to the first liquid return component 14, and the first liquid return pipe 144 of the first liquid return component 14 and the reflux section of the liquid pipe can be the same pipe;

[0043] The second thermal management unit 3 includes a cooling liquid channel disposed in the charging gun 5. The cooling liquid channel is located in or near the heat generating component. One end of the cooling liquid channel is connected to the second liquid supply component 13 and the other end is connected to the second liquid return component 15. Figure 2 As shown, the second liquid supply pipe 132 of the second liquid supply assembly 13 and the second liquid return pipe 154 of the second liquid return assembly 15 can be directly connected to the coolant channel in the charging gun 5 through the inside of the cable 4; or as Figure 3 As shown, the second liquid supply pipe 132 of the second liquid supply assembly 13 and the second liquid return pipe 154 of the second liquid return assembly 15 can be externally connected to the cooling liquid channel in the charging gun 5. The beneficial effect is that this option has the best cooling effect on the cable 4 and the charging gun 5.

[0044] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A dual-circulation cooling system for a charging device, characterized in that: It comprises: an external cooling circulation device (1), a first heat management unit (2) and a second heat management unit (3); The output end of the cooling component (11) of the external cooling circulation device (1) is respectively connected to the input end of the first liquid supply component (12) and the input end of the second liquid supply component (13), and its input end is respectively connected to the output end of the first liquid return component (14) and the output end of the second liquid return component (15), and the cooling component (11) is capable of continuously outputting low-temperature cooling liquid; The first heat management unit (2) is installed in a cable (4) of a charging device, the input end of the first heat management unit (2) is connected to the output end of the first liquid supply component (12), and the output end of the first heat management unit (2) is connected to the input end of the first liquid return component (14), thereby independently circulating and cooling the cable (4); The second heat management unit (3) is installed in a charging gun (5) of a charging device, the input end of the second heat management unit (3) is connected to the second liquid supply component (13) and the output end of the second heat management unit (3) is connected to the second liquid return component (15), thereby independently circulating and cooling the charging gun (5).

2. The dual-circulation cooling system for a charging device according to claim 1, characterized in that: The diameter of the first liquid supply pipe (122) of the first liquid supply assembly (12) and the diameter of the second liquid supply pipe (132) of the second liquid supply assembly (13) are respectively set according to their respective cooling loads.

3. The dual-circulation cooling system for a charging device according to claim 2, characterized in that: The diameter of the first liquid supply pipe (122) and the diameter of the second liquid supply pipe (132) are respectively proportional to their respective cooling loads.

4. The dual-circulation cooling system for a charging device according to claim 1, characterized in that: The first liquid supply component (12) comprises a first liquid supply connection port (121), a liquid supply temperature monitor (120) and a first liquid supply pipe (122), wherein the inner end of the first liquid supply pipe (122) is connected to the output end of the cooling component (11) and the outer end is connected to the first liquid supply connection port (121), and the first liquid supply connection port (121) is connected to the input end of the first thermal management unit (2); Or the second liquid supply component (13) comprises a second liquid supply connection port (131), a liquid supply temperature monitor (120) and a second liquid supply pipe (132), the inner end of the second liquid supply pipe (132) being connected to the output end of the cooling component (11) and the outer end being connected to the second liquid supply connection port (131), and the second liquid supply connection port (131) being connected to the input end of the second thermal management unit (3).

5. The dual-circulation cooling system for a charging device according to claim 4, characterized in that: The liquid supply temperature monitor (120) of the first liquid supply component (12) and the liquid supply temperature monitor (120) of the second liquid supply component (13) are the same sensor.

6. The dual-circulation cooling system for a charging device according to claim 1, characterized in that: The inner end of the first liquid return pipe (144) of the first liquid return component (14) is connected to the input end of the cooling component (11) and the outer end is connected to the first liquid return connection port (141), the first liquid return connection port (141) is connected to the output end of the first thermal management unit (2), and a first flow detection sensor (142) and a first liquid return temperature detector (143) are arranged in the first liquid return pipe (144); Or the inner end of the second liquid return pipe (154) of the second liquid return component (15) is connected to the input end of the cooling component (11) and the outer end is connected to the second liquid return connection port (151), the second liquid return connection port (151) is connected to the output end of the second thermal management unit (3), and the second flow detection sensor (152) and the second liquid return temperature detector (153) are arranged in the second liquid return pipe (154).

7. The dual-circulation cooling system for a charging device according to any one of claims 4 to 6, characterized in that: The liquid supply temperature monitor (120), the first liquid return temperature detector (143) and the second liquid return temperature detector (153) are PT1000 resistors or NTC resistors.

8. The dual-circulation cooling system for a charging device according to any one of claims 4 to 6, characterized in that: The first liquid supply connection port (121), the second liquid supply connection port (131), the first liquid return connection port (141) and the second liquid return connection port (151) are leak-proof joints.

9. The dual-circulation cooling system for a charging device according to claim 1, characterized in that: The cooling component (11) is arranged in the charging pile (6), and the cooling component (11) comprises a heat dissipation component, a cold storage box and a connecting pipeline.

10. The dual-circulation cooling system for a charging device according to claim 1, characterized in that: The first heat management part (2) comprises a liquid passage arranged in the cable (4); The second heat management unit (3) comprises a cooling liquid channel arranged in the charging gun (5).

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