Charging terminal thermal management system and thermal management method thereof

Abstract

This invention discloses a thermal management system for a charging terminal, including a first main circuit, a first branch circuit, a second branch circuit, and a first valve. The first and second branches are connected in parallel. The first main circuit includes a refrigeration unit and a liquid pump. The refrigeration unit provides cooling to the heat exchange medium, and the refrigeration unit and the liquid pump are connected in series. The second branch includes a heat exchanger located within the charging terminal, and the heat exchanger has a channel for the flow of the heat exchange medium. The first valve controls the flow ratio between the first and second branches. This thermal management system can regulate the flow rate of the second branch through the first valve and the first branch, thereby reducing energy consumption. This invention also discloses a thermal management method for a charging terminal, which can control the first valve to adjust the flow ratio between the first and second branches based on the charging signal of the charging terminal, thus reducing energy consumption.

Description

[0001] This application claims priority to Chinese invention patent application filed on November 18, 2022, with application number 2022114457464 and entitled "Temperature Management System for Charging Terminal and Thermal Management Method Thereof". Technical Field

[0002] This application relates to the field of charging terminal technology, and in particular to a charging terminal thermal management system and its thermal management method. Background Technology

[0003] In the thermal management system of a charging gun, the heat exchange fluid obtains cooling energy from the chiller unit and then flows to the charging terminal to cool it. In related technologies, the flow rate of the heat exchange fluid to the charging terminal is fixed and cannot be adjusted according to the usage conditions of the charging terminal. For example, the charging terminal may generate a large amount of heat in some situations and a small amount in others, while the flow rate of the heat exchange fluid used to cool the charging terminal remains constant. This can easily lead to energy loss.

[0004] Therefore, it is necessary to provide a system and method for thermal management of charging terminals that can reduce energy consumption. Summary of the Invention

[0005] The purpose of this application is to provide a thermal management system for a charging terminal that can reduce energy consumption, as well as a thermal management method for the charging terminal.

[0006] The objective of this application is achieved through the following technical solution:

[0007] The first aspect of this application provides a charging terminal thermal management system, including a first main circuit, a first branch circuit, a second branch circuit, and a first valve.

[0008] Both the first branch and the second branch are connected to the first main road. The first branch and the second branch are arranged in parallel. The first main road, the first branch, and the second branch all have channels for the flow of heat exchange medium.

[0009] The first main circuit is equipped with a refrigeration unit and a liquid pump. The refrigeration unit is used to provide cooling to the heat exchange medium, and the refrigeration unit and the liquid pump are connected in series.

[0010] The second branch is equipped with a heat exchanger, which is disposed inside the charging terminal and has a channel for the flow of the heat exchange medium.

[0011] The first valve is used to control the flow ratio between the first branch and the second branch.

[0012] In this application, the charging terminal thermal management system includes a first main circuit, a first branch circuit, a second branch circuit, and a first valve. The first main circuit is equipped with a refrigeration unit and a liquid pump. The first branch circuit and the second branch circuit are connected in parallel. A heat exchanger is disposed in the second branch circuit and is located inside the charging terminal. The first valve is used to control the flow ratio between the first branch circuit and the second branch circuit. Thus, when the charging terminal generates a large amount of heat, the first valve and the first branch circuit can ensure a larger flow rate in the second branch circuit; when the charging terminal generates a small amount of heat, the first valve and the first branch circuit can ensure a smaller flow rate in the second branch circuit. Therefore, the thermal management system of this application can regulate the flow rate of the second branch circuit through the first valve and the first branch circuit, thereby reducing energy consumption.

[0013] A second aspect of this application provides a thermal management method for a charging terminal, comprising the following steps:

[0014] A thermal management system for charging terminals is provided. The thermal management system includes a first main line, a first branch line, a second branch line, and a first valve. The first branch line and the second branch line are both connected to the first main line and are arranged in parallel. The first main line, the first branch line, and the second branch line each have channels for the flow of heat exchange medium. The first main line is equipped with a refrigeration unit and a liquid pump. The refrigeration unit provides cooling to the heat exchange medium, and the refrigeration unit and the liquid pump are arranged in series. The second branch line is equipped with a heat exchange component, which is disposed within a charging terminal. There are at least two charging terminals.

[0015] Turn on the refrigeration unit and liquid pump.

[0016] Obtain the charging signals from the at least two charging terminals.

[0017] The first valve is controlled according to the charging signal to adjust the flow ratio between the first branch and the second branch.

[0018] The thermal management method for the charging terminal provided in this application can control the first valve to adjust the flow ratio between the first branch and the second branch according to the charging signal of the charging terminal, that is, it can adjust the flow of the second branch according to the charging signal of the charging terminal, thereby reducing the thermal management energy consumption of the charging terminal. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a first embodiment of the charging terminal thermal management system of this application;

[0020] Figure 2 for Figure 1 Schematic diagram of a medium-compressor refrigeration system;

[0021] Figure 3 for Figure 1Schematic diagram of the refrigeration system of the third heat exchanger in the middle;

[0022] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0023] Figure 5 for Figure 3 Enlarged view of region B in the middle;

[0024] Figure 6 This is a schematic diagram of a second embodiment of the charging terminal thermal management system of this application;

[0025] Figure 7 for Figure 6 Enlarged diagram of region C in the middle;

[0026] Figure 8 This is a first operating mode diagram of the first embodiment of this application;

[0027] Figure 9 This is a second operating mode diagram of the first embodiment of this application;

[0028] Figure 10 This is a diagram illustrating the third operating mode of the first embodiment of this application;

[0029] Figure 11 This is a diagram illustrating the fourth operating mode of the first embodiment of this application;

[0030] Figure 12 This is a fifth operating mode diagram of the first embodiment of this application;

[0031] Figure 13 This is a sixth operating mode diagram of the first embodiment of this application;

[0032] Figure 14 This is a schematic diagram of the controller of this application. Detailed Implementation

[0033] The exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with this application; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of this application as set forth in the claims.

[0034] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this application. The singular forms “a,” “the,” or “the” used in the description and claims of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish features. Similarly, the terms "an" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "before," "after," "above," "below," and similar words appearing in this application are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" and similar words are an open-ended expression, meaning that the element preceding "comprising" or "including" covers the element following "comprising" or "including" and its equivalents, which does not exclude that the element preceding "comprising" or "including" may also include other elements. If "several" appears in this application, it means two or more.

[0036] In the thermal management system of a charging gun, the heat exchange fluid obtains cooling energy from the refrigeration unit and then flows to the charging terminal to cool it. In related technologies, the flow rate of the heat exchange fluid to the charging terminal is fixed and cannot be adjusted according to the usage conditions of the charging terminal. For example, the charging terminal may generate a large amount of heat in some situations and a small amount in others, while the flow rate of the heat exchange fluid used to cool the charging terminal remains constant. This easily leads to energy loss. Furthermore, current thermal management systems for charging guns use a compressor refrigeration scheme where one refrigeration unit cools one charging gun line. The refrigeration unit often operates under high load, resulting in low efficiency and high energy consumption.

[0037] Figure 1 A flowchart of a first embodiment of the charging terminal thermal management system of this application is shown, as follows: Figure 1 As shown, the charging terminal thermal management system includes a first main line 10, a first branch line 20, and a second branch line 30. Both the first branch line 20 and the second branch line 30 are connected to the first main line 10. The first branch line 20 and the second branch line 30 are arranged in parallel. The first main line 10, the first branch line 20, and the second branch line 30 all have channels for the flow of heat exchange medium.

[0038] See Figure 1The first main circuit 10 is equipped with a refrigeration unit 100 and liquid pumps 21 and 22. The refrigeration unit 100 provides cooling to the heat exchange medium, and the refrigeration unit 100 and liquid pumps 21 and 22 are connected in series. The second branch circuit 30 is equipped with a heat exchange element 3, which is located within the charging terminal 300. The heat exchange element 3 has a channel for the flow of the heat exchange medium. The heat exchange element 3 can be a pipe, a liquid-cooled plate, or other heat exchange element installed in the charging terminal 300.

[0039] like Figure 1 As shown, there are at least two charging terminals 300, and each charging terminal 300 contains at least one heat exchanger 3. The thermal management system can cool at least two charging terminals 300. Compared to a one-to-one configuration of the cooling system and the charging terminal, the thermal management system of this application is advantageous for cost reduction. Each charging terminal 300 includes a charging gun and a charging cable. The thermal management system is used to dissipate heat from the charging cable. A charging station can have one, two, or more charging guns. When multiple charging guns share the thermal management system, in some cases all charging guns are in operation, generating a large amount of heat; in other cases only some charging guns are in operation, generating a small amount of heat. Furthermore, the heat exchange medium bypassed through the first branch 20 has a shorter flow path and less heat loss. Therefore, depending on actual needs, bypassing a portion of the heat exchange medium when the charging guns are partially operational can reduce energy loss.

[0040] See Figure 1 The charging terminal thermal management system includes a first valve 11, which controls the flow ratio between the first branch 20 and the second branch 30. The flow rate of the first main line 10 is equal to the sum of the flow rates of the first branch 20 and the second branch 30. For example, when the charging terminal 300 is under heavy load, the first valve 11 ensures that all the heat exchange medium flows through the first main line 10 into the second branch 30. When the charging terminal 300 is under light load, the opening of the first valve 11 is adjusted to connect the first main line 10 and the second branch 30. The first main line 10 is also connected to the first branch 20. A portion of the heat exchange medium flows to the second branch 30, and the other portion flows to the first branch 20. This diversion through the first branch 20 helps reduce energy consumption.

[0041] The first valve component 11 is a three-way proportional valve. See also... Figure 3 and Figure 5 The first valve component 11 has a first opening 111, a second opening 112, and a third opening 113. The second opening 112 communicates with the channel of the first branch 20, the third opening 113 communicates with the channel of the second branch 30, and the first opening 111 communicates with the channel of the first main channel 10. See also Figure 3 The heat exchanger 3 has an inlet 31 for the inflow of heat exchange medium and an outlet 32 ​​for the outflow of heat exchange medium, and the first valve 11 is positioned close to the inlet 31 relative to the outlet 32 ​​of the heat exchanger 3.

[0042] In the embodiment illustrated in this application, the first opening 111 is the inlet of the first valve 11 for the inflow of heat exchange medium, and the second opening 112 and the third opening 113 are the outlets of the first valve 11 for the outflow of heat exchange medium.

[0043] The first valve 11 can adjust the flow ratio between the first branch 20 and the second branch 30 as needed. When the charging terminal 300 is under heavy load, the first valve 11 is adjusted to connect the first opening 111 and the third opening 113, while the second opening 112 is closed. The flow ratio between the first branch 20 and the second branch 30 is 0:1, meaning that all the heat exchange medium in the first main line 10 flows into the second branch 30 to cool the charging cable and improve heat dissipation efficiency. When the charging terminal 300 is under light load, the first valve 11 is adjusted to connect the first opening 111 and the third opening 113, and the first opening 111 is connected to the second opening 112. The flow ratio between the first branch 20 and the second branch 30 is adjusted to be greater than 0:1, meaning that a portion of the heat exchange medium flows to the first branch 20 and the other portion flows to the second branch 30.

[0044] like Figure 3 As shown, the second branch 30 has at least two third branches 40, which are connected in parallel. Each third branch 40 has a heat exchanger 3. The third branch 40 also has a second valve 12, which controls the opening or closing of the third branch 40. When the charging gun corresponding to the heat exchanger 3 of a certain third branch 40 is working, the branch is controlled to be in a conducting state, meaning the heat exchange medium can enter from the inlet and exit from the outlet of the third branch 40; conversely, it is in a closed state.

[0045] See Figure 1 The refrigeration unit 100 includes a second main circuit 50 and a fourth branch circuit 60. The second main circuit 50 has a flow channel for refrigerant circulation. The second main circuit 50 is equipped with a first heat exchanger 4, a compressor 5, a second heat exchanger 6, and a throttling device 7, which are connected in series. The fourth branch circuit 60 is connected to the first main circuit 100 and has a channel for heat exchange medium circulation. The fourth branch circuit 60 is equipped with the first heat exchanger 4.

[0046] In the embodiments illustrated in this application, the first heat exchange device 4 is an evaporator, and the second heat exchange device 6 is a condenser. A throttling device 7 controls the flow rate of liquid refrigerant to the evaporator. In some embodiments, the throttling device 7 is an electronic expansion valve.

[0047] The evaporator can be a plate heat exchanger, where the heat exchange medium and refrigerant exchange heat within the plate heat exchanger. Alternatively, in other embodiments, the evaporator can be a shell-and-tube heat exchanger or a coaxial heat exchanger, where the heat exchange medium and refrigerant exchange heat within the evaporator. The evaporator is used for the evaporation of the refrigerant, which absorbs heat from the heat exchange medium and evaporates into a gaseous state, simultaneously cooling the heat exchange medium.

[0048] For details, see Figure 1 The first heat exchange device 4 includes a first interface 41, a second interface 42, a third interface 43 and a fourth interface 44. The first interface 41 and the second interface 42 are connected to the second main channel 50, and the third interface 43 and the fourth interface 44 are connected to the fourth branch channel 60.

[0049] In some embodiments, the first port 41 and the fourth port 44 of the first heat exchange device 4 are both outlets, with the first port 41 used for the outflow of refrigerant and the fourth port 44 used for the outflow of heat exchange medium; the second port 42 and the third port 43 are both inlets, with the second port 42 used for the inflow of refrigerant and the third port 43 used for the inflow of heat exchange medium. Figure 2 As shown, compressor 5 includes a first inlet 51 and a first outlet 52, with a first interface 41 connected to the first inlet 51 of compressor 5. Second heat exchange device 6 includes a second inlet 61 and a second outlet 62, with the first outlet 52 of compressor 5 connected to the second inlet 61 of second heat exchange device 6. Throttling device 7 has a third inlet 71 and a third outlet 72, with the second outlet 62 of second heat exchange device 6 connected to the third inlet 71 of throttling device 7, and the third outlet 72 of throttling device 7 connected to the second interface 42 of first heat exchange device 4. Refrigerant circulates in the second main circuit 50. After receiving gaseous refrigerant from first heat exchange device 4, compressor 5 compresses it into high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then enters second heat exchange device 6, where it condenses into low-temperature, high-pressure liquid refrigerant. This low-temperature, high-pressure liquid refrigerant then re-enters first heat exchange device 4 for heat exchange.

[0050] See Figure 2 The second main circuit 50 also includes a fan 501 located next to the second heat exchanger 6. The fan 501 is used to carry the heat generated by the second heat exchanger 6 to the outside air, which can improve the working efficiency of the second heat exchanger 6. The second main circuit 50 is also equipped with a first charging valve 502 and a second charging valve 503. The first charging valve 502 is located between the first heat exchanger 4 and the compressor 5, and the second charging valve 503 is located between the compressor 5 and the second heat exchanger 6. The first charging valve 502 is used to charge the compressor 5 with refrigerant when needed, and the second charging valve 503 is used to charge the second heat exchanger 6 with refrigerant when needed.

[0051] See also Figure 2The second main channel 50 is also equipped with a first filter 504, which is used to filter impurities in the refrigerant. In the embodiment illustrated in this application, the first filter 504 is connected in series between the second heat exchange device 6 and the throttling device 7. The first filter 504 filters the refrigerant flowing out of the second heat exchange device 6 to prevent impurities from entering the throttling device 7.

[0052] See Figure 1 The refrigeration unit 100 also includes a fifth branch 70 and a third valve 13. The fifth branch 70 is connected to the first main branch 10 and has a channel for the flow of the heat exchange medium. The fifth branch 70 is connected in parallel with the fourth branch 60, and the fifth branch 70 is equipped with a third heat exchange device 8. The third heat exchange device 8 is connected in parallel with the second heat exchange device 6. The third heat exchange device 8 is an air cooler, which uses ambient air as the refrigerant. The heat exchange medium and the ambient air exchange heat within the air cooler.

[0053] The third valve 13 is used to control the flow ratio between the fourth branch 60 and the fifth branch 70. The flow rate of the first main line 10 is equal to the sum of the flow rates of the fourth branch 60 and the fifth branch 70.

[0054] The third valve, 13, is a three-way proportional valve. For example... Figure 3 and Figure 4 As shown, the third valve 13 includes a fourth opening 131, a fifth opening 132, and a sixth opening 133. The fourth opening 131 is connected to the fourth branch 60, the fifth opening 132 is connected to the fifth branch 70, and the sixth opening 133 is connected to the first main line 10.

[0055] The third valve 13 can adjust the flow ratio between the fourth branch 60 and the fifth branch 70 as needed. When the charging terminal 300 is under heavy load, adjusting the third valve 13 connects the fourth opening 131 and the sixth opening 133, while the fifth opening 132 is closed. The flow ratio between the fifth branch 70 and the fourth branch 60 is 0:1, meaning that all the heat exchange medium in the first main line 10 flows into the fourth branch 60 to cool the charging cable and improve heat dissipation efficiency. When the charging terminal 300 is under light load, adjusting the third valve 13 connects the fourth opening 131 and the sixth opening 133, and also connects the fifth opening 132 to the sixth opening 133. The flow ratio between the fifth branch 70 and the fourth branch 60 is adjusted to be greater than 0:1, meaning that a portion of the heat exchange medium flows to the fifth branch 70, and the other portion flows to the fourth branch 60. When the load on the charging terminal 300 is less, the third valve 13 is adjusted to connect the fifth opening 132 and the sixth opening 133, while the fourth opening 131 remains closed. The flow ratio between the fourth branch 60 and the fifth branch 70 is 0:1, meaning that all the heat exchange medium in the first main branch 10 flows into the fifth branch 70 to cool the charging cable. This allows for the selection of different heat dissipation modes based on the load, which is beneficial for energy saving.

[0056] In the embodiments illustrated in this application, the fourth opening 131 and the fifth opening 132 of the third valve 13 are both outlets for the outflow of the heat exchange medium, and the sixth opening 133 is an inlet for the inflow of the heat exchange medium. One outlet is connected to the fourth branch 60, the other outlet is connected to the fifth branch 70, and the inlet is connected to the first main line 10. In some embodiments, the liquid pumps 21 and 22 include a first liquid pump 21 and a second liquid pump 22. The first liquid pump 21 is located in the first main line 10 connected to the outlet of the branch, and the second liquid pump 22 is located in the first main line 10 connected to the inlet of the branch. During operation, the heat exchange medium flows from the second liquid pump 22 to the third valve 13, flows through the outlet of the third valve 13 to the branch, flows from the outlet of the branch to the first liquid pump 21, and flows through the first liquid pump 21 to the heat exchanger 3.

[0057] Of course, in other embodiments, the first main road 10 may only be provided with the first liquid pump 21, and the first liquid pump 21 is located in the first main road 10 connected to the outlet of the branch road, and the first main road 10 is not provided with the second liquid pump 22; or, the first main road 10 may only be provided with the second liquid pump 22, and the second liquid pump 22 is located in the first main road 10 connected to the inlet of the branch road, and the first main road 10 is not provided with the first liquid pump 21.

[0058] See Figure 3The first main path 10 is also equipped with a heater 9. The heat exchanger 3 has an inlet 31 for the inflow of heat exchange medium and an outlet 32 ​​for the outflow of heat exchange medium. The heater 9 is closer to the inlet 31 than the outlet 32. The heater 9 is used to heat the heat exchange medium to a preset temperature. The heat exchange medium can be water or other coolant.

[0059] In some embodiments, the first liquid pump 21 is positioned closer to the inlet than the outlet of the first valve 11, and the second liquid pump 22 is positioned closer to the inlet than the outlet of the third valve 13. The heater 9 is positioned closer to the inlet than the outlet of the first liquid pump 21. In other embodiments, the heater 9 may also be positioned closer to the outlet than the inlet of the first liquid pump 21.

[0060] See Figure 3 The thermal management system also includes a liquid storage tank 101 and a pressure relief valve 102, which is used to discharge gas from the circuit. The liquid storage tank 101 is used to store the heat exchange medium and to regulate and replenish the capacity of the heat exchange medium in the thermal management system. For example, when the charging terminal 300 has a low load, the heat exchange medium in the first branch 20 can be collected in the liquid storage tank 101, and the compressor 5, fan 501, and liquid pumps 21 and 22 will be in a low-load state and operate at a low frequency, reducing system energy consumption and promoting energy saving. In some embodiments, the pressure relief valve 102 is located in the liquid storage tank 101. Of course, the pressure relief valve 102 can also be located in the first main branch 10, and the pressure relief valve 102 is located close to the liquid storage tank 101.

[0061] In the embodiment illustrated in this application, the liquid storage tank 101 is disposed on the first main path 10, and the liquid storage tank 101 is disposed near the inlet of the second liquid pump 22. In other embodiments, the liquid storage tank 101 may also be disposed on the first branch path 20.

[0062] See Figure 2 The thermal management system also includes a temperature sensor 103 for detecting ambient temperature. The temperature sensor 103 can be installed in the second heat exchanger 6. Alternatively, the temperature sensor 103 can also be installed in the second main circuit 50.

[0063] like Figure 3 As shown, the first main path 10 is provided with a second filter 104, which is connected between the second liquid pump 22 and the liquid storage tank 101 to remove impurities in the heat exchange medium. Of course, in other embodiments, the second filter 104 can also be connected between the heater 9 and the first liquid pump 21.

[0064] See Figure 14The charging terminal thermal management system includes a controller 200. The controller 200 receives charging signals from the charging terminal 300 and, based on these signals, controls the first valve 11 to adjust the flow ratio between the first branch 20 and the second branch 30. The controller 200 also controls the speed adjustment of the compressor 5 and the fan 501 based on the charging signals. The controller can also control the second valve 12 to guide and cut off flow in the third branch 40, and control the third valve 13 to adjust the flow ratio between the fourth branch 60 and the fifth branch 70.

[0065] Figure 6 A flowchart of a second embodiment of the thermal management system for charging terminals of this application is shown. The difference from the first embodiment is that the third valve 13 is disposed in the first main road 10 connected to the inlet of the branch road, whereas in the first embodiment, the third valve 13 is disposed in the first main road 10 connected to the inlet of the branch road.

[0066] like Figure 6 and Figure 7 As shown, the fourth opening 131 and the fifth opening 132 of the third valve 13 are both inlets for the inflow of heat exchange medium, and the sixth opening 133 is the outlet for the outflow of heat exchange medium. One inlet is connected to the fourth branch 60, the other inlet is connected to the fifth branch 70, and the outlet is connected to the first main line 10.

[0067] The charging terminal thermal management system of this application is equipped with two cooling modes to accommodate different ambient temperatures. In high-temperature environments, a compressor cooling mode can be used; in low-temperature environments, an air cooler cooling mode can be used, which is beneficial for energy conservation and environmental protection. When the ambient temperature is moderate, both compressor cooling mode and air cooler cooling mode can be used simultaneously. Based on the load of the charging terminal 300, the flow ratio of the first branch 20 and the third branch 40 can be adjusted to reduce system energy consumption, which is also beneficial for energy saving.

[0068] When the ambient temperature is high, the thermal management system adopts a compressor cooling mode. In compressor cooling mode, based on the load of the charging terminal 300, the thermal management system also includes a first operating mode and a second operating mode. When the ambient temperature is high and the load on the charging terminal 300 is high, the thermal management system adopts the first operating mode. Taking the first implementation method as an example... Figure 8As shown, the specific working process of the thermal management system is as follows: The first main circuit 10 is connected to the fourth branch circuit 60. After receiving the gaseous refrigerant from the first heat exchange device 4, the compressor 5 compresses it into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant then enters the second heat exchange device 6. The second heat exchange device 6 condenses the high-temperature and high-pressure gaseous refrigerant into a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure refrigerant then enters the first heat exchange device 4 for heat exchange. The heat exchange medium of the first main circuit 10 and the refrigerant of the second main circuit 50 exchange heat in the first heat exchange device 4. The first valve 11 is adjusted so that the first main circuit 10 is only connected to the second branch circuit 30. The flow ratio of the first branch circuit 20 and the second branch circuit 30 is adjusted to 0:1. All the cooled heat exchange medium enters the heat exchange element 3 to cool the charging cable.

[0069] When the ambient temperature is high, the charging terminal 300 has a lower load, and the thermal management system adopts the second operating mode. Taking the first implementation method as an example, such as... Figure 9 As shown, the specific working process of the thermal management system is as follows: the first main line 10 is connected to the fourth branch line 60, and the heat exchange medium of the first main line 10 and the refrigerant of the second main line 50 exchange heat in the first heat exchange device 4; the first valve 11 is adjusted to connect the first main line 10 to the second branch line 30. At the same time, the first main line 10 is also connected to the first branch line 20. The flow ratio of the first branch line 20 to the second branch line 30 is adjusted to be greater than 0:1. Part of the cooled heat exchange medium enters the heat exchange device 3 to cool the charging cable, and the other part flows into the first branch line 20.

[0070] When the ambient temperature is low, the thermal management system adopts an air-cooled mode. In this mode, based on the load of the charging terminal 300, the thermal management system also includes a third and a fourth operating mode. When the ambient temperature is low and the load on the charging terminal 300 is high, the thermal management system adopts the third operating mode. Taking the first implementation method as an example... Figure 10 As shown, the specific working process of the thermal management system is as follows: the first main line 10 is connected to the fifth branch line 70, and the heat exchange medium of the first main line 10 is cooled in the third heat exchange device 8; the first valve 11 is adjusted so that the first main line 10 is only connected to the second branch line 30, and the flow ratio of the first branch line 20 to the second branch line 30 is adjusted to 0:1, and all the cooled heat exchange medium enters the heat exchange device 3 to cool the charging cable.

[0071] When the ambient temperature is low, the charging terminal 300 has a smaller load, and the thermal management system adopts the fourth operating mode. Taking the first implementation method as an example, such as... Figure 11As shown, the specific working process of the thermal management system is as follows: the first main line 10 is connected to the fifth branch line 70, and the heat exchange medium in the first main line 10 is cooled in the third heat exchange device 8; the first valve 11 is adjusted to connect the first main line 10 to the second branch line 30. At the same time, the first main line 10 is also connected to the first branch line 20. The flow ratio of the first branch line 20 to the second branch line 30 is adjusted to be greater than 0:1. Part of the cooled heat exchange medium enters the heat exchange device 3 to cool the charging cable, and the other part flows into the first branch line 20.

[0072] When the ambient temperature is moderate, the thermal management system further includes a fifth operating mode and a sixth operating mode, depending on the load of the charging terminal 300. When the ambient temperature is moderate and the load of the charging terminal 300 is relatively high, the thermal management system adopts the fifth operating mode. Taking the first implementation method as an example, as... Figure 12 As shown, the specific working process of the thermal management system is as follows: the first main line 10 is connected to the fourth branch line 60, and the first main line 10 is also connected to the fifth branch line 70. Part of the heat exchange medium flows into the fourth branch line 60, and the other part of the heat exchange medium flows into the fifth branch line 70. The first valve 11 is adjusted so that the first main line 10 is only connected to the second branch line 30. The flow ratio of the first branch line 20 and the second branch line 30 is adjusted to 0:1. All the cooled heat exchange medium enters the heat exchanger 3 to cool the charging cables.

[0073] When the ambient temperature is moderate, the charging terminal 300 has a relatively low load, and the thermal management system adopts the sixth operating mode. Taking the first implementation method as an example, such as... Figure 13 As shown, the specific working process of the thermal management system is as follows:

[0074] The first main path 10 is connected to the fourth branch path 60, and the first main path 10 is also connected to the fifth branch path 70. Part of the heat exchange medium flows into the fourth branch path 60, and the other part of the heat exchange medium flows into the fifth branch path 70. Adjusting the first valve 11 connects the first main path 10 to the second branch path 30. At the same time, the first main path 10 is also connected to the first branch path 20. The flow ratio of the first branch path 20 to the second branch path 30 is adjusted to be greater than 0:1. Part of the cooled heat exchange medium enters the heat exchanger 3 to cool the charging cable, and the other part flows into the first branch path 20.

[0075] A thermal management method for a charging terminal includes the following steps:

[0076] A charging terminal thermal management system is provided, comprising a first main line 10, a first branch line 20, a second branch line 30, and a first valve 11. The first branch line 20 and the second branch line 30 are both connected to the first main line 10 and are arranged in parallel. The first main line 10, the first branch line 20, and the second branch line 30 all have channels for the flow of the heat exchange medium. The first main line 10 is equipped with a refrigeration unit 100 and liquid pumps 21 and 22. The refrigeration unit 100 provides cooling to the heat exchange medium, and the refrigeration unit 100 is connected in series with the liquid pumps 21 and 22. The second branch line 30 is equipped with a heat exchange element 3, which is disposed within a charging terminal 300. There are at least two charging terminals 300.

[0077] Turn on the refrigeration unit 100 and liquid pumps 21 and 22;

[0078] Acquire charging signals from at least two charging terminals 300;

[0079] The first valve 11 is controlled according to the charging signal to adjust the flow ratio between the first branch 20 and the second branch 30.

[0080] The charging signal includes the number of charging terminals 300 that are in operation.

[0081] The first valve 11 is controlled according to the charging signal to adjust the flow ratio of the first branch 20 and the second branch 30, including the following steps:

[0082] Determine whether the number of charging terminals 300 in working condition is equal to the total number of charging terminals 300;

[0083] If yes, adjust the flow ratio of the first branch 20 to the second branch 30 to 0:1; if no, adjust the flow ratio of the first branch 20 to the second branch 30 to be greater than 0:1.

[0084] In some embodiments, as described above, the refrigeration unit 100 includes a compressor 5. The thermal management method of this application further includes the step of controlling the speed of the compressor 5 according to a charging signal. Thus, the thermal management system of this application can not only control the flow ratio of the first branch 20 and the second branch 30 according to the charging signal, but also control the speed of the compressor 5 according to the charging signal. When the cooling capacity required by the charging terminal 300 is small, the speed of the compressor 5 can be reduced, allowing the refrigeration unit to operate under partial load, thereby improving the efficiency of the refrigeration unit and reducing its energy consumption.

[0085] In some embodiments, the charging signal includes the number of charging terminals 300 in operation, and controlling the speed of the compressor 5 according to the charging signal includes the following steps:

[0086] Determine whether the number of charging terminals 300 in working condition is equal to the total number of charging terminals 300;

[0087] If yes, then control compressor 5 to operate at full load speed; if no, then control compressor 5 to operate at partial load speed.

[0088] Thus, when the number of charging terminals 300 in operation is equal to the total number of charging terminals 300, the compressor 5 operates at full load; when the number of charging terminals 300 in operation is less than the total number of charging terminals 300, that is, when the cooling capacity required by the charging terminals 300 is reduced, the compressor 5 operates at partial load or at reduced frequency, thereby improving the efficiency of the refrigeration unit and reducing the energy consumption of the refrigeration unit.

[0089] In some implementations, the rotational speed of the compressor 5 is positively correlated with the number of charging terminals 300 in operation. That is, the more charging terminals 300 in operation, the faster the compressor 5 rotates.

[0090] The above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. The understanding of this specification should be based on those skilled in the art. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A thermal management system for a charging terminal, characterized in that, It includes the first main road, the first branch road, the second branch road, and the first valve. Both the first branch and the second branch are connected to the first main road. The first branch and the second branch are arranged in parallel. The first main road, the first branch, and the second branch all have channels for the flow of heat exchange medium. The first main circuit is equipped with a refrigeration unit and a liquid pump. The refrigeration unit is used to provide cooling to the heat exchange medium, and the refrigeration unit and the liquid pump are connected in series. The second branch is equipped with a heat exchanger, which is disposed inside the charging terminal and has a channel for the flow of the heat exchange medium. The first valve controls the flow ratio between the first branch and the second branch according to the charging signal. When the charging terminal is under heavy load, the first valve allows all the heat exchange medium to pass through the first main line and enter the second branch. When the charging terminal is under light load, the opening of the first valve is adjusted to connect the first main line and the second branch. The first main line is also connected to the first branch.

2. The charging terminal thermal management system as described in claim 1, characterized in that: The first valve is a three-way proportional valve, which has a first opening, a second opening and a third opening. The second opening is connected to the channel of the first branch, the third opening is connected to the channel of the second branch, and the first opening is connected to the channel of the first main line.

3. The charging terminal thermal management system as described in claim 1, characterized in that: The second branch is provided with at least two third branches, which are arranged in parallel, and the third branch is provided with the heat exchanger; There are at least two charging terminals, and at least one of the heat exchange components is provided inside each charging terminal.

4. The charging terminal thermal management system as described in claim 3, characterized in that: The third branch is equipped with a second valve, which is used to control the opening or closing of the third branch.

5. The charging terminal thermal management system as described in claim 1, characterized in that: The refrigeration unit includes a second main circuit and a fourth branch circuit; The second main circuit has a flow channel for refrigerant circulation, and the second main circuit is equipped with a first heat exchange device, a compressor, a second heat exchange device, and a throttling device; The fourth branch is connected to the first main branch, the fourth branch has a channel for the flow of the heat exchange medium, and the fourth branch is equipped with the first heat exchange device.

6. The charging terminal thermal management system as described in claim 5, characterized in that: The refrigeration unit also includes a fifth branch and a third valve. The fifth branch is connected to the first main branch and has a channel for the flow of the heat exchange medium. The fifth branch is arranged in parallel with the fourth branch and is equipped with a third heat exchange device. The third valve is used to control the flow ratio between the fourth branch and the fifth branch, and the flow rate of the first main branch is equal to the sum of the flow rates of the fourth branch and the fifth branch.

7. The charging terminal thermal management system as described in claim 1, characterized in that: A heater is also provided on the first main line. The heat exchanger has an inlet for the inflow of heat exchange medium and an outlet for the outflow of heat exchange medium. The heater is close to the inlet relative to the outlet.

8. The charging terminal thermal management system as described in claim 1, characterized in that: The charging terminal thermal management system includes a controller; The controller is used to receive the charging signal from the charging terminal, and to control the first valve to adjust the flow ratio between the first branch and the second branch according to the charging signal.

9. A thermal management method for a charging terminal, characterized in that, Includes the following steps: A thermal management system for charging terminals is provided. The system includes a first main line, a first branch line, a second branch line, and a first valve. The first and second branch lines are both connected to the first main line and are arranged in parallel. Each of the first main line, the first branch line, and the second branch line has a channel for the flow of a heat exchange medium. The first main line is equipped with a refrigeration unit and a liquid pump. The refrigeration unit provides cooling to the heat exchange medium, and the refrigeration unit and the liquid pump are connected in series. The second branch line is equipped with a heat exchange component, which is disposed within a charging terminal. There are at least two charging terminals. Turn on the refrigeration unit and liquid pump; Obtain the charging signals from the at least two charging terminals; According to the charging signal, the first valve is controlled to adjust the flow ratio between the first branch and the second branch. When the charging terminal is under heavy load, the first valve allows all the heat exchange medium to pass through the first main line and enter the second branch. When the charging terminal is under light load, the opening of the first valve is adjusted to connect the first main line and the second branch. The first main line is also connected to the first branch.

10. The thermal management method according to claim 9, characterized in that, The charging signal includes the number of the charging terminals that are in operation. The process of controlling the first valve to adjust the flow ratio of the first branch and the second branch according to the charging signal includes the following steps: Determine whether the number of the charging terminals in the working state is equal to the total number of the charging terminals; If yes, then adjust the flow ratio of the first branch to the second branch to 0:1; if no, then adjust the flow ratio of the first branch to the second branch to be greater than 0:

1.

11. The thermal management method according to claim 9, characterized in that, The refrigeration unit includes a compressor, and the thermal management method further includes the following steps: The compressor speed is controlled according to the charging signal.

12. The thermal management method according to claim 11, characterized in that, The charging signal includes the number of the charging terminals that are in operation. Controlling the compressor speed according to the charging signal includes the following steps: Determine whether the number of the charging terminals in the working state is equal to the total number of the charging terminals; If yes, the compressor is controlled to operate at full load speed; otherwise, the compressor is controlled to operate at partial load speed.

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