Cooling System and Charging Pile

Abstract

The present application provides a cooling system and a charging pile. The cooling system includes a first heat exchanger, a second heat exchanger, and a third heat exchanger. The first heat exchanger includes a first heat exchange part and a second heat exchange part. The second heat exchange part is connected in series with the energy storage battery module of the charging pile through a first cooling circuit. The second heat exchanger is connected in series with the power conversion module of the charging pile through a second cooling circuit. The third heat exchanger is connected in parallel with the second heat exchanger through a first valve group. The third heat exchanger is connected in series with the energy storage battery module of the charging pile through a third cooling circuit. The third cooling circuit includes a second valve group. Among them, the first valve group and the second valve group have opposite opening and closing states. The cooling system combines two cooling methods, refrigerant cooling and natural cooling, and can adaptively adjust the refrigeration mode of the cooling system, which is beneficial to reducing the energy consumption of the cooling system.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and specifically relates to a cooling system and a charging pile. Background Art

[0002] The integration of energy storage and charging in a charging pile is one of the methods to achieve fast charging. With the increase in the power of the charging pile and the acceleration of the charging speed, the heat generated during the energy conversion process increases significantly. Excessive temperature will lead to a decline in equipment performance and may also pose safety hazards. Therefore, a cooling system is required for the charging pile to improve the heat dissipation efficiency.

[0003] However, the current refrigeration mode of the charging pile cooling system is relatively single and cannot be adjusted according to the working state of the charging pile and the external ambient temperature, resulting in high energy consumption of the charging pile cooling system. Summary of the Invention

[0004] In view of the above problems, the present application provides a cooling system and a charging pile to solve the technical problems of the relatively single refrigeration mode of the current charging pile cooling system and the high energy consumption of the cooling system.

[0005] To solve the above technical problems, the technical solution concept adopted in the present application is as follows:

[0006] In a first aspect, the present application provides a cooling system, including: a first heat exchanger, the first heat exchanger having a first heat exchange part and a second heat exchange part, the first heat exchange part flowing refrigerant, and the second heat exchange part flowing coolant; the first heat exchange part is connected in series to a refrigeration circuit, and the second heat exchange part is connected in series with an energy storage battery module of the charging pile through a first cooling circuit; a second heat exchanger, the second heat exchanger being a natural cooler, and the second heat exchanger is connected in series with a power conversion module of the charging pile through a second cooling circuit; a third heat exchanger, the third heat exchanger being a natural cooler, the third heat exchanger is connected in parallel with the second heat exchanger through a first valve group, and the third heat exchanger is connected in series with the energy storage battery module of the charging pile through a third cooling circuit, and the third cooling circuit includes a second valve group; wherein, the first valve group and the second valve group have opposite opening and closing states.

[0007] In one embodiment, the cooling system further includes a refrigeration circuit and a cooling circuit. The cooling circuit includes a first cooling circuit, a second cooling circuit, and a third cooling circuit. The refrigeration circuit circulates refrigerant, and the cooling circuit circulates coolant. The refrigeration circuit includes a first main path, and the first main path includes a compressor, a condenser, a first throttling device, and a first heat exchange part connected in series in sequence. The first cooling circuit includes a second heat exchange part, a first liquid pump, an energy storage battery module of the charging pile, and a third valve group. The second cooling circuit includes a second main path. When the first valve group is open, the second main path includes a second heat exchanger, a third heat exchanger, a second liquid pump, and a power conversion module of the charging pile. Or, when the first valve group is closed, the second main path includes a second heat exchanger, a second liquid pump, and a power conversion module of the charging pile. The third cooling circuit includes a third heat exchanger, a second valve group, a first liquid pump, and an energy storage battery module of the charging pile.

[0008] In one embodiment, the cooling system further includes a fourth heat exchanger, the cooling circuit further includes a fourth cooling circuit, and the second cooling circuit further includes a first branch. The fourth heat exchanger includes a third heat exchange part and a fourth heat exchange part. The third heat exchange part is arranged on the first branch, and the fourth heat exchange part is connected in series with the charging gun module of the charging pile through the fourth cooling circuit. The first branch is connected in parallel at both ends of the power conversion module of the charging pile.

[0009] In one embodiment, the fourth cooling circuit includes a fourth heat exchange part, a third liquid pump, and a charging gun module of the charging pile.

[0010] In one embodiment, the cooling system has a first refrigeration mode, a second refrigeration mode, a third refrigeration mode, and a fourth refrigeration mode; in the first refrigeration mode, the first valve group is closed, the second valve group is open, the third valve group is closed, the compressor stops running, the first liquid pump and the second liquid pump run, and the third liquid pump stops running; the refrigeration circuit and the first cooling circuit are in a cut-off state, the second cooling circuit is in a conducting state, the third cooling circuit is in a conducting state, and the fourth cooling circuit is in a cut-off state; in the second refrigeration mode, the first valve group is closed, the second valve group is open, the third valve group is open, the compressor runs, the first liquid pump and the second liquid pump run, and the third liquid pump stops running; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a conducting state, and the fourth cooling circuit is in a cut-off state; in the third refrigeration mode, the first valve group is open, the second valve group is closed, the third valve group is open, the compressor runs, the first liquid pump and the second liquid pump run, and the third liquid pump stops running; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a cut-off state, and the fourth cooling circuit is in a cut-off state; in the fourth refrigeration mode, the first valve group is open, the second valve group is closed, the third valve group is open, the compressor runs, the first liquid pump, the second liquid pump, and the third liquid pump run; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a cut-off state, and the fourth cooling circuit is in a conducting state.

[0011] In one embodiment, when the external ambient temperature is less than 10°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the first refrigeration mode; or, when the external ambient temperature is greater than or equal to 10°C and less than 18°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the second refrigeration mode; or, when the external ambient temperature is greater than or equal to 18°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the third refrigeration mode; or, when the external ambient temperature is less than 50°C and the energy storage battery of the charging pile is in a discharging state, the cooling system operates in the fourth refrigeration mode.

[0012] In one embodiment, the cooling system further includes a fifth heat exchanger, and the refrigeration circuit further includes a second branch; the fifth heat exchanger includes a fifth heat exchange part and a sixth heat exchange part, the fifth heat exchange part circulates refrigerant, and the sixth heat exchange part circulates coolant; the sixth heat exchange part is disposed between the coolant outlet of the power conversion module and the coolant inlet of the second heat exchanger; the second branch is connected in parallel at both ends of the first heat exchange part, the second branch includes the fifth heat exchange part and a second throttling device, and in the flow direction of the refrigerant, the second throttling device is disposed before the fifth heat exchange part.

[0013] In one embodiment, the cooling system has a fifth refrigeration mode. In the fifth refrigeration mode, the first valve group is opened, the second valve group is closed, the third valve group is opened, the second throttling device is opened, the compressor operates, and the first liquid pump, the second liquid pump, and the third liquid pump operate; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a cut-off state, and the fourth cooling circuit is in a conducting state.

[0014] In one embodiment, when the external ambient temperature is greater than or equal to 50°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the fifth refrigeration mode.

[0015] In one embodiment, the cooling system further includes a temperature sensor and a control module. The temperature sensor is used to detect the external ambient temperature, and the control module determines the refrigeration mode of the cooling system according to the external ambient temperature and the operating state of the energy storage battery of the charging pile.

[0016] In one embodiment, the cooling system further includes a fan, and the fan is used for the heat dissipation of the condenser.

[0017] In a second aspect, the present application further provides a charging pile, including the cooling system of the first aspect, and the cooling system is used for the heat dissipation of the charging pile.

[0018] Different from the related art, the beneficial effects of the embodiments of the present application are as follows: The cooling system provided by the present application combines two cooling methods of refrigerant cooling and natural cooling. In the energy storage battery module, the natural cooling method can be used to undertake part or all of the refrigeration tasks. In the power conversion module, the heat exchange area of the natural cooler can be adjusted. Therefore, it can adaptively adjust the refrigeration mode of the cooling system according to the ambient temperature where the charging pile is located and the heat generation conditions of the energy storage battery module and the power conversion module, which is not only beneficial to the heat dissipation of the energy storage battery module and the power conversion module, conducive to maintaining the normal working state of the charging pile, but also beneficial to reducing the energy consumption of the cooling system. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, where:

[0020] Figure 1 is the state diagram of the cooling system of the present application in the first refrigeration mode;

[0021] Figure 2 is the state diagram of the cooling system of the present application in the second refrigeration mode;

[0022] Figure 3It is a state diagram of the cooling system of this application in the third refrigeration mode or the fourth refrigeration mode;

[0023] Figure 4 It is a state diagram of the cooling system of this application in the fifth refrigeration mode.

[0024] In the drawings: 1, refrigeration circuit; 1a, first main path; 1b, second branch; 2, first cooling circuit; 3, second cooling circuit; 3a, second main path; 3b, first branch; 4, third cooling circuit; 5, fourth cooling circuit; 10, first heat exchanger; 10a, first heat exchange part; 10b, second heat exchange part; 11, compressor; 12, condenser; 13, first throttling device; 14, second throttling device; 15, fan; 20, second heat exchanger; 21, first liquid pump; 30, third heat exchanger; 31, second liquid pump; 40, fourth heat exchanger; 40a, third heat exchange part; 40b, fourth heat exchange part; 50, fifth heat exchanger; 50a, fifth heat exchange part; 50b, sixth heat exchange part; 51, third liquid pump; 1F, first valve group; 2F, second valve group; 3F, third valve group. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. It can be understood that the specific embodiments described herein are only used to explain this application, rather than limiting this application. Additionally, it should be noted that for the sake of convenience of description, only the parts related to this application rather than all the structures are shown in the drawings. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0027] In the description of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified or limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] Reference to "an embodiment" in this text means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] The charging pile integrating energy storage and charging is one of the solutions to achieve fast charging of electric vehicles. This solution can reduce the problem of limited charging power caused by grid load limitations. The energy storage integrated charging pile is usually equipped with a large-capacity energy storage battery and a high-power power conversion module, which can provide a relatively high output power and greatly shorten the charging time. At the same time, the high power also leads to an increase in heat generation of the charging pile, mainly involving the heat generation of the energy storage battery module, the power conversion module, and the charging gun module. Therefore, a cooling system with high heat dissipation capacity needs to be equipped. In related technologies, the energy storage battery module is usually cooled by a compression refrigeration system, and the compression refrigeration system needs to be turned on throughout the year, resulting in high energy consumption of the cooling system.

[0031] A charging pile integrating energy storage and charging usually has three working states: ultra-fast charging, fast charging, and energy replenishment. Ultra-fast charging means that the charging pile outputs electrical energy at an extremely high power, with an output power of over 400 kW; fast charging means that the charging pile outputs electrical energy at a relatively high power, with an output power of around 30 kW - 100 kW; energy replenishment means that the power grid replenishes electrical energy to the energy storage battery of the charging pile. Among them, in the ultra-fast charging and fast charging states, the output power is high and more heat is generated; in the energy replenishment state, the power of the power grid charging the energy storage battery is relatively low, so relatively less heat is generated. Therefore, in different working states, the charging pile has differences in heat generation, and the cooling system can be adjusted adaptively based on this.

[0032] Based on this, the present application provides a cooling system and a charging pile. Please refer to Figures 1 to 4 , Figures 1 to 4 which is a state diagram of the cooling system of the present application in different refrigeration modes. The cooling system includes a first heat exchanger 10. The first heat exchanger 10 has a first heat exchange part 10a and a second heat exchange part 10b. The first heat exchange part 10a circulates refrigerant, and the second heat exchange part 10b circulates coolant. The first heat exchange part 10a is connected in series to the refrigeration circuit, and the second heat exchange part 10b is connected to the energy storage battery module of the charging pile through a first cooling circuit 2; a second heat exchanger 20. The second heat exchanger 20 is a natural cooler. The second heat exchanger 20 is connected in series to the power conversion module of the charging pile through a second cooling circuit 3; a third heat exchanger 30. The third heat exchanger 30 is a natural cooler. The third heat exchanger 30 is connected in parallel to the second heat exchanger 20 through a first valve group 1F. The third heat exchanger 30 is connected to the energy storage battery module of the charging pile through a third cooling circuit 4. The third cooling circuit 4 includes a second valve group 2F; among them, the first valve group 1F and the second valve group 2F have opposite opening and closing states.

[0033] The first heat exchanger 10 can utilize the heat exchange between the refrigerant and the coolant to lower the temperature of the coolant flowing through the second heat exchange part 10b to a relatively low value. The above-mentioned coolant can exchange heat with the energy storage battery module of the charging pile through the first cooling circuit 2, and when the energy storage battery generates more heat, it can meet the cooling requirements of the energy storage battery; the second heat exchanger 20 and the third heat exchanger 30 are natural coolers. A natural cooler is a cooling device that uses the medium and physical principles in the natural environment and does not require additional power drive. It mainly relies on the convection, conduction, and radiation of natural media such as air or water to achieve heat transfer to achieve the cooling purpose. Therefore, the second heat exchanger 20 and the third heat exchanger 30 have relatively low energy consumption. At the same time, the temperature of the coolant flowing through the second heat exchanger 20 and the third heat exchanger 30 drops to a relatively high value.

[0034] The power conversion module of the charging pile is usually cooled by a coolant at a relatively high temperature, so cold energy can be provided in a natural cooling manner. Among them, the third heat exchanger 30 and the second heat exchanger 20 are connected in parallel through the first valve group 1F. That is, when the first valve group 1F is closed, the third heat exchanger 30 and the second heat exchanger 20 are in a separated state. The coolant flowing through the second heat exchanger 20 can exchange heat with the power conversion module of the charging pile through the second cooling circuit 3 to meet the cooling requirements of the power conversion module. When the first valve group 1F is opened, the third heat exchanger 30 and the second heat exchanger 20 are in a combined state, the heat exchange area increases, and the heat exchange capacity is improved. When the power conversion module of the charging pile generates more heat, it can meet the greater cooling requirements of the power conversion module.

[0035] Furthermore, the first valve group 1F and the second valve group 2F have opposite opening and closing states, that is, when the first valve group 1F is closed, the second valve group 2F is opened; when the second valve group 2F is opened, the first valve group 1F is closed. When the first valve group 1F is closed and the second valve group 2F is opened, the coolant flowing through the third heat exchanger 30 exchanges heat with the energy storage battery module of the charging pile through the third cooling circuit 4. At this time, the third heat exchanger 30 can undertake part or all of the refrigeration tasks of the energy storage battery module. In the actual use process, when the external ambient temperature is relatively low, such as in winter, spring, and autumn, and the cold energy provided by natural cooling is relatively large and the heat generated by the energy storage battery is relatively small, part or all of the cold energy is provided for the energy storage battery module in a natural cooling manner. On the premise of meeting the heat dissipation requirements of the energy storage battery module, the energy consumption generated by the refrigerant cooling method can be reduced. Among them, as Figure 1 shown, the first valve group 1F and the second valve group 2F may each include 2 valve components, and the types of the first valve group 1F and the second valve group 2F include but are not limited to solenoid valves.

[0036] In summary, the cooling system provided by the present application combines two cooling methods of refrigerant cooling and natural cooling. The energy storage battery module can adopt the natural cooling method to undertake part or all of the refrigeration tasks, and the heat exchange area of the natural cooler can be adjusted in the power conversion module. Therefore, it can adaptively adjust the refrigeration mode of the cooling system according to the ambient temperature where the charging pile is located and the heat generation conditions of the energy storage battery module and the power conversion module, which is not only beneficial to the heat dissipation of the energy storage battery module and the power conversion module, conducive to maintaining the normal working state of the charging pile, but also beneficial to reducing the energy consumption of the cooling system.

[0037] In an embodiment, the energy storage battery module includes at least one energy storage battery and a heat exchange component of the energy storage battery. Among them, the heat exchange component of the energy storage battery includes but is not limited to liquid cooling pipes, liquid cooling plates, etc. The heat exchange component has a coolant channel for circulating the coolant, and the heat exchange component is in direct contact with the energy storage battery, which is beneficial to improving the heat exchange efficiency and the uniformity of heat exchange.

[0038] In one embodiment, the power conversion module includes an AC-DC conversion module (AC / DC conversion module) and a DC-DC conversion module (DC / DC conversion module). The AC / DC conversion module includes an AC / DC converter and its heat exchanger. The DC / DC conversion module includes a DC / DC converter and its heat exchanger. Among them, the heat exchanger includes, but is not limited to, liquid cooling pipes, liquid cooling plates, etc. The heat exchanger has a coolant channel for circulating coolant. The heat exchanger is in direct contact with the AC / DC converter and the DC / DC converter, which is beneficial to improving the heat exchange efficiency and uniformity of heat exchange.

[0039] In the power converter, the function of the AC / DC converter is to convert the input alternating current into direct current, providing a suitable power form for subsequent charging of electrical equipment. The DC / DC converter can further process the direct current, and perform operations such as voltage adjustment and stabilization according to the requirements of the energy storage battery of the electrical equipment. In another embodiment, the power conversion module only includes the AC / DC conversion module. At this time, the parameters of the direct current output by the AC / DC converter (such as voltage, current, etc.) already meet the charging requirements of the energy storage battery of the electrical equipment.

[0040] In one embodiment, the first heat exchanger 10 is a plate heat exchanger. The plate heat exchanger has a high heat transfer coefficient, which is beneficial to improving the heat exchange efficiency; it has a compact structure and a small floor area, which is beneficial to the miniaturization of the cooling system; it has great operation flexibility and a wide application range, which is beneficial to adapting to different application scenarios. In other embodiments, the first heat exchanger 10 can also be other types of heat exchangers, such as shell-and-tube heat exchangers, etc., as long as the heat exchange requirements can be met.

[0041] In one embodiment, the cooling system further includes a refrigeration circuit 1 and a cooling circuit. The cooling circuit includes a first cooling circuit 2, a second cooling circuit 3 and a third cooling circuit 4. The refrigeration circuit 1 circulates refrigerant, and the cooling circuit circulates coolant; the refrigeration circuit 1 includes a first main path 1a, and the first main path 1a includes a compressor 11, a condenser 12, a first throttling device 13 and a first heat exchange part 10a connected in series in sequence; the first cooling circuit 2 includes a second heat exchange part 10b, a first liquid pump 21, an energy storage battery module of the charging pile and a third valve group 3F; the second cooling circuit 3 includes a second main path 3a; when the first valve group 1F is opened, the second main path 3a includes a second heat exchanger 20 and a third heat exchanger 30, a second liquid pump 31, and the power conversion module of the charging pile; or, when the first valve group 1F is closed, the second main path 3a includes a second heat exchanger 20, a second liquid pump 31, and the power conversion module of the charging pile; the third cooling circuit 4 includes a third heat exchanger 30, a second valve group 2F, a first liquid pump 21 and an energy storage battery module of the charging pile.

[0042] The refrigeration circuit 1 circulates coolant. The circulation process of the refrigerant in the first main path 1a of the refrigeration circuit 1 is as follows: The compressor 11 provides power for the refrigerant circulation in the refrigeration circuit 1. The compressor 11 sucks in the low-temperature and low-pressure refrigerant gas and then compresses the gas to make it into a high-temperature and high-pressure gas. This high-temperature and high-pressure refrigerant gas has relatively high energy and can effectively transfer heat in the subsequent heat exchange process. The high-temperature and high-pressure gaseous refrigerant is transported to the condenser 12. The condenser 12 is a place where heat exchange occurs. In the condenser 12, the gaseous refrigerant can release heat to the external environment, thereby undergoing a phase change and condensing from a gas state to a liquid state. The liquid refrigerant is transported to the first heat exchange part 10a of the first heat exchanger 10 through the first throttling device 13. In the first heat exchanger 10, heat exchange occurs with the coolant. The refrigerant absorbs the heat of the coolant and cools down the coolant. Among them, the first throttling device 13 is used to regulate the flow rate of the refrigerant.

[0043] It should be noted that the components included in the refrigeration circuit 1 are only the most basic components that make up the refrigeration circuit 1. Those skilled in the art can add valves, sensors, etc. to the refrigeration circuit 1 according to the actual application needs. Among them, the first throttling device 13 includes but is not limited to an electronic expansion valve.

[0044] The first cooling circuit 2 provides cooling for the energy storage battery module. The circulation process of the coolant in the first cooling circuit 2 is as follows: In the first cooling circuit 2, the coolant that has undergone heat exchange with the low-temperature liquid refrigerant in the first heat exchanger 10 flows through the second heat exchange part 10b. The first liquid pump 21 provides power for the circulation of the coolant in the first cooling circuit 2. The first liquid pump 21 sucks in the low-temperature coolant from the first heat exchanger 10 and transports the coolant to the energy storage battery module of the charging pile. The coolant exchanges heat with the energy storage battery in the coolant channel of the energy storage battery module and absorbs the heat generated by the energy storage battery. Subsequently, the coolant flows back to the first heat exchanger 10, is cooled, and then recirculates. Among them, the third valve group 3F in the first cooling circuit 2 is used to control the flow state of the first cooling circuit 2 and make the first cooling circuit 2 conduct or cut off according to the actual usage situation. As Figure 1 shown, the number of valve parts of the third valve group 3F can be 1, and the type of the third valve group 3F includes but is not limited to a solenoid valve. During actual use, when the external environmental temperature is relatively low, for example, in winter, the natural cooling can provide more cooling capacity, and when the energy storage battery is in the energy replenishment stage and generates less heat, the third valve group 3F is closed, then the first cooling circuit 2 is cut off, and at the same time the compressor 11 stops working, and the refrigeration circuit 1 is also cut off, which is beneficial to reducing the energy consumption of the compressor 11.

[0045] In one embodiment, the liquid inlet of the refrigerant in the first heat exchange part 10a and the liquid outlet of the coolant in the second heat exchange part 10b are at the same end of the first heat exchanger 10, and the liquid outlet of the refrigerant in the first heat exchange part 10a and the liquid inlet of the coolant in the second heat exchange part 10b are at the same end of the first heat exchanger 10. At this time, the refrigerant and the coolant adopt a countercurrent heat exchange method, which is beneficial to improving the heat transfer efficiency.

[0046] In one embodiment, the compressor 11 is a variable-frequency compressor 11. That is, the operating frequency of the compressor 11 can be adjusted according to the refrigeration demand of the cooling system. When more heat is generated inside the charging pile and a stronger refrigeration effect is required, the compressor 11 can increase its operating speed, improve the circulation flow rate and pressure of the refrigerant, thereby increasing the refrigeration capacity; when the temperature approaches the normal operating temperature of the energy storage battery module or the load is low, the compressor 11 can reduce its operating speed and reduce the refrigeration capacity to achieve the purpose of energy saving.

[0047] The second cooling circuit 3 cools the power conversion module. Taking the closing of the first valve as an example, the circulation process of the coolant in the second main path 3a of the second cooling circuit 3 is described as follows: In the second cooling circuit 3, the coolant exchanges heat with the natural environment in the second heat exchanger 20. The lower the temperature of the natural environment, the more heat of the coolant can be taken away; the second liquid pump 31 provides power for the circulation of the coolant in the second cooling circuit 3. The second liquid pump 31 sucks in the low-temperature coolant from the second heat exchanger 20 and transports the coolant to the power conversion module of the charging pile; the coolant exchanges heat with the power converter in the coolant channel of the power conversion module and absorbs the heat generated by the power converter; then the coolant flows back to the second heat exchanger 20, is cooled and then recirculated.

[0048] When the second valve is opened, the coolant exchanges heat with the natural environment in the second heat exchanger 20 and the third heat exchanger 30, which is equivalent to an increase in the heat exchange area. Therefore, the heat exchange rate can be increased and the refrigeration capacity can be increased. In addition, the circulation process of the coolant is the same as that when the second valve is closed, and reference can be made to the above description, which will not be elaborated here.

[0049] The third cooling circuit 4 cools the energy storage battery module. The circulation process of the coolant in the third cooling circuit 4 is as follows: In the third cooling circuit 4, the coolant exchanges heat with the natural environment in the third heat exchanger 30; the first liquid pump 21 provides power for the circulation of the coolant in the third cooling circuit 4. The first liquid pump 21 sucks in the low-temperature coolant from the third heat exchanger 30 and transports the coolant to the energy storage battery module of the charging pile; the coolant exchanges heat with the energy storage battery in the coolant channel of the energy storage battery module and absorbs the heat generated by the energy storage battery; then the coolant flows back to the third heat exchanger 30, is cooled and then recirculated.

[0050] Therefore, in the cooling system provided by the present application, the first cooling circuit 2 and the third cooling circuit 4 can respectively or simultaneously provide cooling for the energy storage battery module, and the energy storage battery module adopts a refrigerant cooling, natural cooling or a combination of both methods; the second cooling circuit 3 provides cooling for the power conversion module, and at the same time, the heat exchange area of the natural heat exchanger in the second cooling circuit 3 can be adjusted, so that the cooling capacity provided by the second cooling circuit 3 for the power conversion module can be adjusted. The pipeline setting of the above cooling system is the implementation basis for various refrigeration modes of the cooling system, enabling the cooling system to adaptively adjust its refrigeration mode according to the external environmental temperature and the heat generation situation of each module of the charging pile, which is not only beneficial to maintaining the normal working state of the charging pile, but also beneficial to reducing the energy consumption of the cooling system.

[0051] In an embodiment, the cooling system further includes a fourth heat exchanger 40, the cooling circuit further includes a fourth cooling circuit 5, and the second cooling circuit 3 further includes a first branch 3b; the fourth heat exchanger 40 includes a third heat exchange part 40a and a fourth heat exchange part 40b, the third heat exchange part 40a is arranged in the first branch 3b, the fourth heat exchange part 40b is connected in series with the charging gun module of the charging pile through the fourth cooling circuit 5, and the first branch 3b is connected in parallel at both ends of the power conversion module of the charging pile.

[0052] The fourth heat exchanger 40 is a place where heat exchange occurs between the coolant in the first branch 3b and the coolant in the fourth cooling circuit 5. For the convenience of description, the coolant in the second cooling circuit 3 is called the first coolant, and the coolant in the fourth cooling circuit 5 is called the second coolant. The first branch 3b is connected in parallel at both ends of the power conversion module. Therefore, the first coolant flowing into the first branch 3b and the first coolant flowing into the power conversion module are both low-temperature coolants cooled by natural cooling. The above low-temperature coolants can absorb the heat of the second coolant flowing through the fourth heat exchange part 40b, reducing the temperature of the second coolant; when the energy storage battery of the charging pile is in the discharging state, the charging pile supplies power to the electrical equipment through the charging gun module. At this time, the charging gun module also generates heat, and the relatively low-temperature second coolant can absorb the heat generated by the charging gun module to achieve the purpose of cooling the charging gun module.

[0053] In an embodiment, the charging gun module includes at least one charging gun and a heat exchanger of the charging gun. Among them, the charging gun includes a charging gun body and a charging cable, and the heat exchanger of the charging gun includes, but is not limited to, liquid cooling pipes, liquid cooling plates, etc. The heat exchanger has a coolant channel for circulating coolant, and the heat exchanger is in direct contact with the charging gun, which is beneficial to improving the heat exchange efficiency and the uniformity of heat exchange.

[0054] In one embodiment, the types of the first coolant and the second coolant are different. For example, the first coolant is water and the second coolant is oil. Through the above arrangement, different cooling requirements of the power conversion module and the charging gun module can be met. In other embodiments, the types of the first coolant and the second coolant may also be the same.

[0055] In one embodiment, the fourth cooling circuit 5 includes a fourth heat exchange part 40b, a third liquid pump 51, and a charging gun module of a charging pile.

[0056] The fourth cooling circuit 5 provides cooling for the charging gun module. The circulation process of the second coolant in the fourth cooling circuit 5 is as follows: In the fourth cooling circuit 5, the second coolant exchanges heat with the first coolant in the fourth heat exchanger 40; the third liquid pump 51 provides power for the circulation of the second coolant in the fourth cooling circuit. The third liquid pump 51 sucks in the low-temperature second coolant from the fourth heat exchanger 40 and transports the second coolant to the charging gun module of the charging pile; the coolant exchanges heat with the charging gun in the coolant channel of the charging gun module and absorbs the heat generated by the charging gun; then the coolant flows back to the fourth heat exchanger 40, is cooled, and recirculates.

[0057] Through the arrangement of the fourth cooling circuit 5, cooling can be provided for the charging gun, the temperature of the charging gun when supplying power to the electrical equipment can be reduced, and the normal working state of the charging gun can be maintained; at the same time, the fourth cooling circuit 5 enables the coolants for cooling the charging gun module and the power conversion module to adopt different materials, so as to meet the different cooling requirements of different modules.

[0058] In one embodiment, the cooling system further includes a fifth heat exchanger 50, and the refrigeration circuit 1 further includes a second branch 1b; the fifth heat exchanger 50 includes a fifth heat exchange part 50a and a sixth heat exchange part 50b. The fifth heat exchange part 50a circulates the refrigerant, and the sixth heat exchange part 50b circulates the coolant; the sixth heat exchange part 50b is arranged between the coolant outlet of the power conversion module and the coolant inlet of the second heat exchanger 20; the second branch 1b is connected in parallel at both ends of the first heat exchange part 10a. The second branch 1b includes a fifth heat exchange part 50a and a second throttling device 14. In the flowing direction of the refrigerant, the second throttling device 14 is arranged before the fifth heat exchange part 50a.

[0059] When the refrigeration circuit 1 includes a first main path 1a and a second branch path 1b, on the basis of the refrigerant circulation process in the first main path 1a, after the liquid refrigerant flows out of the condenser 12, a part of it passes through the first throttling device 13 and flows through the first main path 1a to the first heat exchange part 10a of the first heat exchanger 10, and a part passes through the second throttling device 14 and flows through the second branch path 1b to the fifth heat exchange part 50a of the fifth heat exchanger 50; after the two parts of the refrigerant exchange heat with the coolant in the second heat exchange part 10b and the sixth heat exchange part 50b respectively, they flow to the compressor 11. Among them, the first throttling device 13 and the second throttling device 14 are used to adjust the refrigerant flow ratio of the first main path 1a and the second branch path 1b, so as to adjust the cooling capacity of the first main path 1a and the second branch path 1b according to the actual use situation. Among them, the first throttling device 13 and the second throttling device 14 include but are not limited to electronic expansion valves.

[0060] During the actual use process, when the external ambient temperature is relatively high, such as in hot summer weather, when the cooling capacity provided by natural cooling is relatively small and the charging pile generates more heat, the refrigerant cooling (the first cooling circuit 2) provides cooling capacity for the energy storage battery module, and the natural cooling (the second cooling circuit 3) supplements the refrigerant cooling (the second branch path 1b) to provide cooling capacity for the power conversion module and the charging gun module, which can make up for the deficiency of natural cooling, so that the cooling system provides a large amount of cooling capacity for the charging pile and meets the cooling requirements of the charging pile in a high-temperature environment.

[0061] In a specific embodiment, the cooling system provided by the present application has a first refrigeration mode, a second refrigeration mode, a third refrigeration mode and a fourth refrigeration mode.

[0062] Embodiment 1: The cooling system is in the first refrigeration mode

[0063] Please refer to Figure 1 , Figure 1 , which is the state diagram of the cooling system of the present application in the first refrigeration mode. In the first refrigeration mode, the first valve group 1F is closed, the second valve group 2F is opened, the third valve group 3F is closed, the compressor 11 stops running, the first liquid pump 21 and the second liquid pump 31 run, and the third liquid pump 51 stops running; the refrigeration circuit 1 and the first cooling circuit 2 are in a cut-off state, the second cooling circuit 3 is in a conducting state, the third cooling circuit 4 is in a conducting state, and the fourth cooling circuit 5 is in a cut-off state.

[0064] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a separated state; the compressor 11 stops operating, and the refrigeration circuit 1 and the cooling circuit are in a cut-off state, thus reducing the energy consumption generated by the compressor 11; the second cooling circuit 3 cools the power conversion module, and the second cooling circuit 3 only includes the second heat exchanger 20, that is, the power conversion module adopts the natural cooling method, and at the same time the heat exchange area is small; the third cooling circuit 4 cools the energy storage battery module, and the third cooling circuit 4 includes the third heat exchanger 30, that is, the energy storage battery module adopts the natural cooling method. In the first refrigeration mode, both the energy storage battery module and the power conversion module of the charging pile adopt the natural cooling method, which can significantly reduce the energy consumption of the cooling system; at the same time, the cooling capacity provided by the cooling system in the first refrigeration mode is small, and it is applicable to the working condition where the external environmental temperature is low and the charging pile is in the energy replenishment state.

[0065] In an embodiment, when the external environmental temperature is less than 10 °C and the energy storage battery of the charging pile is in the charging state, the cooling system operates in the first refrigeration mode. At this time, the external environmental temperature is relatively low, and the natural heat exchangers (i.e., the second heat exchanger 20 and the third heat exchanger 30) can provide a large amount of cooling capacity. At the same time, the charging pile is in the energy replenishment state, generates less heat, and the charging gun module does not need to be cooled. The first refrigeration mode can meet the cooling requirements of the charging pile and reduce the energy consumption of the cooling system at the same time. At this time, the external environmental temperature is less than 10 °C and the energy storage battery of the charging pile is in the charging state, so the first refrigeration mode can also be called the winter charging mode.

[0066] Embodiment 2: The cooling system is in the second refrigeration mode

[0067] Please refer to Figure 2 , Figure 2 which is the state diagram of the cooling system of the present application in the second refrigeration mode. In the second refrigeration mode, the first valve group 1F is closed, the second valve group 2F is opened, the third valve group 3F is opened, the compressor 11 operates, the first liquid pump 21 and the second liquid pump 31 operate, and the third liquid pump 51 stops operating; the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, the second cooling circuit 3 is in a conducting state, the third cooling circuit 4 is in a conducting state, and the fourth cooling circuit 5 is in a cut-off state.

[0068] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a separated state; the compressor 11 is operating, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and at the same time the third cooling circuit 4 is in a conducting state. Therefore, the first cooling circuit 2 and the third cooling circuit 4 provide cooling for the energy storage battery module, that is, the energy storage battery module adopts a self-cooling method to assist the refrigerant cooling method; the second cooling circuit 3 provides cooling for the power conversion module, and the second cooling circuit 3 only includes the second heat exchanger 20, that is, the power conversion module adopts a natural cooling method, and at the same time the heat exchange area is small. In the second refrigeration mode, the energy storage battery module of the charging pile mainly adopts the natural cooling method, and the insufficient cooling capacity is supplemented by the refrigerant cooling method. The power conversion module adopts the natural cooling method, which can reduce the energy consumption of the cooling system; at the same time, compared with the first refrigeration mode, the cooling capacity provided by the cooling system in the second refrigeration mode increases, and it can be applied to the working condition where the external environmental temperature is relatively low and the charging pile is in the energy replenishment state.

[0069] It should be noted that in the second refrigeration mode, both the first cooling circuit 2 and the third cooling circuit 4 adopt the first liquid pump 21 to provide circulating power. It can be that the first liquid pump 21 includes two flow paths, which are respectively used for circulating the coolant of the first cooling circuit 2 and the coolant of the third cooling circuit 4, or it can be that the first liquid pump 21 includes two liquid pumps, one of which is used for circulating the coolant of the first cooling circuit 2, and the other is used for circulating the coolant of the third cooling circuit 4. At the same time, the heat exchange element of the energy storage battery module has a coolant channel corresponding to the first liquid pump 21 one by one.

[0070] In an embodiment, when the external environmental temperature is greater than or equal to 10°C and less than 18°C, and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the second refrigeration mode. At this time, the external environmental temperature has increased but is still relatively low. The cooling capacity that the natural heat exchangers (i.e., the second heat exchanger 20 and the third heat exchanger 30) can provide has decreased compared with the first refrigeration mode, but still can provide a large amount of cooling capacity. At the same time, the charging pile is in the energy replenishment state, generates less heat, and the charging gun module does not need to be cooled. The second refrigeration mode can meet the cooling requirements of the charging pile and reduce the energy consumption of the cooling system. At this time, the external environmental temperature is greater than or equal to 10°C and less than 18°C, and the energy storage battery of the charging pile is in a charging state. Therefore, the second refrigeration mode can also be called the spring and autumn charging mode.

[0071] Embodiment 3: The cooling system is in the third refrigeration mode

[0072] Please refer to Figure 3 , Figure 3This is a state diagram of the cooling system of this application in the third refrigeration mode or the fourth refrigeration mode. In the third refrigeration mode, the first valve group 1F is opened, the second valve group 2F is closed, the third valve group 3F is opened, the compressor 11 operates, the first liquid pump 21 and the second liquid pump 31 operate, and the third liquid pump 51 stops operating; the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, the second cooling circuit 3 is in a conducting state, the third cooling circuit 4 is in a cut-off state, and the fourth cooling circuit 5 is in a cut-off state.

[0073] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 operates, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and at the same time the third cooling circuit 4 is in a cut-off state. Therefore, the first cooling circuit 2 provides cooling for the energy storage battery module, that is, the energy storage battery module adopts the refrigerant cooling method; the second cooling circuit 3 provides cooling for the power conversion module, and the second cooling circuit 3 includes the second heat exchanger 20 and the third heat exchanger 30, that is, the power conversion module adopts the natural cooling method, and at the same time the heat exchange area is relatively large. In the third refrigeration mode, the energy storage battery module of the charging pile adopts the refrigerant cooling method, and the power conversion module adopts the natural cooling method, which can provide more cooling capacity; at the same time, compared with the second refrigeration mode, the cooling capacity provided by the cooling system in the third refrigeration mode is further increased, and it can be applied to the working conditions where the external environmental temperature is relatively high and the charging pile is in the energy replenishment state.

[0074] In an embodiment, when the external environmental temperature is greater than or equal to 18 °C and the energy storage battery of the charging pile is in the charging state, the cooling system operates in the third refrigeration mode. At this time, the external environmental temperature further increases, and the cooling capacity that can be provided by the natural cooling method further decreases compared with the first refrigeration mode. Therefore, it is necessary to provide cooling capacity for the energy storage battery module by the refrigerant cooling method, and provide cooling capacity for the power conversion module by the natural cooling method with a relatively large heat exchange area. At the same time, the charging pile is in the energy replenishment state, and the charging gun module does not need to be cooled. The third refrigeration mode can meet the cooling requirements of the charging pile. At this time, the external environmental temperature is greater than or equal to 18 °C, and the energy storage battery of the charging pile is in the charging state. Therefore, the third refrigeration mode can also be called the summer charging mode.

[0075] Example 4: The cooling system is in the fourth refrigeration mode

[0076] Please continue to refer to Figure 3 . In the fourth refrigeration mode, the first valve group 1F is opened, the second valve group 2F is closed, the third valve group 3F is opened, the compressor 11 operates, the first liquid pump 21, the second liquid pump 31 and the third liquid pump 51 operate; the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, the second cooling circuit 3 is in a conducting state, the third cooling circuit 4 is in a cut-off state, and the fourth cooling circuit 5 is in a conducting state.

[0077] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 is operating, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and at the same time the third cooling circuit 4 is in a cut-off state. Therefore, the first cooling circuit 2 provides cooling for the energy storage battery module, that is, the energy storage battery module adopts a refrigerant cooling method; the second cooling circuit 3 provides cooling for the power conversion module, and the second cooling circuit 3 includes the second heat exchanger 20 and the third heat exchanger 30, that is, the power conversion module adopts a natural cooling method and has a relatively large heat exchange area; the fourth cooling circuit 5 provides cooling for the charging gun module, that is, the charging gun module also adopts a natural cooling method. In the fourth refrigeration mode, the energy storage battery module of the charging pile adopts a refrigerant cooling method, and the power conversion module and the charging gun module adopt a natural cooling method, which can provide more cooling capacity; at the same time, since the cooling system provides cooling for the charging gun module in the fourth refrigeration mode, the fourth refrigeration mode is applicable to the working condition of the charging pile supplying power to the electrical equipment at a general temperature.

[0078] In one embodiment, when the ambient temperature is less than 50 °C and the energy storage battery of the charging pile is in a discharging state, the cooling system operates in the fourth refrigeration mode. At this time, the charging pile is in a supercharging state or a fast charging state, generating more heat, and the charging gun module also needs to be cooled. The fourth refrigeration mode can meet the cooling requirements of the charging pile and maintain the normal working state of the charging pile. At this time, the ambient temperature is less than 50 °C and the energy storage battery of the charging pile is in a discharging state. Therefore, the fourth refrigeration mode can also be called the standard discharging mode.

[0079] Embodiment 5: The cooling system is in the fifth refrigeration mode

[0080] Please refer to Figure 4 , Figure 4 , which is the state diagram of the cooling system of the present application in the fifth refrigeration mode. In the fifth refrigeration mode, the first valve group 1F is opened, the second valve group 2F is closed, the third valve group 3F is opened, the second throttling device 14 is opened, the compressor 11 is operating, and the first liquid pump 21, the second liquid pump 31 and the third liquid pump 51 are operating; the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, the second cooling circuit 3 is in a conducting state, the third cooling circuit 4 is in a cut-off state, and the fourth cooling circuit 5 is in a conducting state.

[0081] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 is operating, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and at the same time the third cooling circuit 4 is in a cut-off state. Therefore, the first cooling circuit 2 provides cooling for the energy storage battery module, that is, the energy storage battery module adopts the refrigerant cooling method; the second cooling circuit 3 provides cooling for the power conversion module, and the second cooling circuit 3 includes the second heat exchanger 20 and the third heat exchanger 30, and is supplemented by the refrigerant cooling of the second branch 1b. That is, the power conversion module is mainly cooled by natural cooling and supplemented by refrigerant cooling; the fourth cooling circuit 5 provides cooling for the charging gun module, that is, the charging gun module also adopts natural cooling and is supplemented by refrigerant cooling. In the fifth refrigeration mode, the energy storage battery module of the charging pile adopts the refrigerant cooling method, and the power conversion module and the charging gun module adopt the natural cooling method combined with the refrigerant cooling method, which can provide more cooling capacity and can be applied to the working conditions where the natural cooling method can provide insufficient cooling capacity and the charging pile supplies power to the electrical equipment in extremely high temperature weather.

[0082] In an embodiment, when the ambient temperature is greater than or equal to 50°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the fifth refrigeration mode. At this time, the charging pile is in a supercharging state or a fast charging state, and the charging gun module also needs to be cooled, generating more heat, and the ambient temperature is relatively high. The compressor 11 is used to assist in increasing the cooling capacity of the power conversion module and the charging gun module, which can make up for the insufficient cooling capacity of natural cooling, so as to meet the cooling requirements of the charging pile in a high temperature environment and maintain the normal working state of the charging pile. At this time, the ambient temperature is greater than or equal to 50°C and the energy storage battery of the charging pile is in a discharging state. Therefore, the fifth refrigeration mode can also be called the extremely high temperature discharging mode.

[0083] It should be noted that when the cooling system operates in any one of the first refrigeration mode, the second refrigeration mode, the third refrigeration mode, and the fourth refrigeration mode, the cooling system may also include the fifth heat exchanger 50 and the second branch 1b of the refrigeration circuit 1. At this time, the second throttle valve is closed to block the flow of the refrigerant in the second branch 1b, so as to reduce unnecessary cooling capacity consumption and is beneficial to reducing the energy consumption of the cooling system.

[0084] In an embodiment, the cooling system further includes a temperature sensor and a control module. The temperature sensor is used to detect the ambient temperature, and the control module determines the refrigeration mode of the cooling system according to the ambient temperature and the operating state of the energy storage battery of the charging pile.

[0085] Among them, the operating states of the energy storage battery include the charging state, the discharging state, and the stationary state. When the energy storage battery is in the charging state, the charging pile is in the energy replenishment state, and the cooling system provides cooling for the energy storage battery and the AC / DC converter in the power conversion module; when the energy storage battery is in the discharging state, the charging pile is in the supercharging state or the fast charging state, and the cooling system provides cooling for the energy storage battery, the AC / DC converter and the DC / DC converter in the power conversion module, and the charging gun; when the energy storage battery is in the stationary state, the charging pile is in the non-operating state, and the cooling system stops running.

[0086] The control module determines the refrigeration mode of the cooling system according to the external environmental temperature and the operating state of the energy storage battery of the charging pile, and can adaptively adjust the refrigeration mode of the cooling system under different working conditions, so as to reduce the energy consumption of the cooling system on the premise of meeting the cooling requirements and maintaining the normal operation of the charging pile.

[0087] In an embodiment, the cooling system further includes a fan 15, and the fan 15 is used for dissipating heat from the condenser 12. The fan 15 improves the heat dissipation efficiency by accelerating the air flow and taking away the heat dissipated by the condenser 12 into the air.

[0088] This application also provides a charging pile, including the cooling system of any of the above embodiments, and the cooling system is used for dissipating heat of the charging pile. The cooling system combines two cooling methods of refrigerant cooling and natural cooling, and can adaptively adjust the cooling method of the cooling system according to the environmental temperature where the charging pile is located and the working state of the charging pile, which is beneficial to the heat dissipation of the charging pile, thus maintaining the normal working state of the charging pile, and is also beneficial to reducing the energy consumption of the cooling system.

[0089] To further illustrate the advantages of the cooling system of this application in reducing energy consumption when the external environmental temperature is less than 10°C (winter), it is assumed that the charging pile of this application is used in Shanghai, and its energy consumption data is compared with the energy consumption data of the traditional cooling system. The details are as follows.

[0090] Please refer to Table 1, which is the data table of the average temperature in Shanghai from January to December. It can be seen that the average temperature in Shanghai is less than 10°C in January, February, and December. Therefore, in the above three months, when the charging pile provided by this application is in the energy replenishment state, the cooling system adopts the first refrigeration mode, and when in the supercharging and fast charging states, the cooling system adopts the fourth refrigeration mode. Based on the refrigeration modes of the above cooling system, and assuming that the charging pile experiences 3 full charges and 3 full discharges in a day (experiences 3 complete charge and discharge processes), calculate the energy consumption of the cooling system provided by this application in January, February, and December; at the same time, take the traditional cooling system that adopts a single refrigeration mode in the three states of energy replenishment, supercharging, and fast charging of the charging pile (using the refrigerant cooling method to provide cold for the energy storage battery module, and using the natural cooling method to provide cold for the power conversion module and the charging gun module) as a comparison, and calculate the corresponding energy consumption of the cooling system at this time. See Tables 2 to 4 for details.

[0091] Table 1 is the data table of the average temperature in Shanghai from January to December

[0092]

[0093] Table 2 shows the energy consumption of the charging pile cooling system in January

[0094]

[0095] Note: "Supercharging state 1" and "Supercharging state 2" represent the discharge states of energy storage batteries with two different charging speeds. "Energy replenishment state" represents the charging state of the energy storage battery. Supercharging state 1 + Supercharging state 2 + Energy replenishment state is the complete charge and discharge process experienced by the charging pile.

[0096] Table 3 shows the energy consumption of the charging pile cooling system in February

[0097]

[0098] Table 4 shows the energy consumption of the charging pile cooling system in December

[0099]

[0100] According to Tables 2 to 4, the energy consumption of the cooling system of the present application in January, February, and December is: 2.992×3×31 + 3.011×3×30 + 3.030×3×31 = 278.256 + 270.99 + 281.79 = 831.036 kWh; while the energy consumption of the traditional cooling system in January, February, and December is: 4.856×3×31 + 4.875×3×30 + 5.144×3×31 = 451.608 + 438.750 + 478.392 = 1368.75 kWh. That is, the cooling system of the present application reduces the energy consumption by approximately 40% compared with the traditional cooling system in winter, and the saved electricity exceeds 500 kWh.

[0101] The main reason for the low energy consumption of the cooling system of the present application is that when the external ambient temperature is less than 10°C, the cooling system operates in the first refrigeration mode under the charging state and in the fourth refrigeration mode under the discharging state. Then, under the charging state, only natural cooling can be used to provide cooling capacity for the energy storage battery module and the power conversion module, which can meet the cooling requirements of the charging pile without using the refrigerant cooling method with large energy consumption. Therefore, compared with the traditional cooling system that uses the refrigerant cooling method to provide cooling capacity for the energy storage battery module regardless of the charging state or the discharging state, the energy consumption is significantly reduced.

[0102] The above are only the implementation manners of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A cooling system, characterized in that: include: A first heat exchanger, wherein the first heat exchanger comprises a first heat exchange part and a second heat exchange part, wherein a refrigerant flows through the first heat exchange part, and a coolant flows through the second heat exchange part; the first heat exchange part is connected in series with a refrigeration circuit, and the second heat exchange part is connected in series with an energy storage battery module of the charging pile through the first cooling circuit; A second heat exchanger, wherein the second heat exchanger is a natural cooler, and the second heat exchanger is connected in series with the power conversion module of the charging pile through a second cooling circuit; A third heat exchanger, wherein the third heat exchanger is a natural cooler, the third heat exchanger is connected in parallel with the second heat exchanger through a first valve group, the third heat exchanger is connected in series with the energy storage battery module of the charging pile through a third cooling circuit, and the third cooling circuit includes a second valve group; Wherein, the first valve group and the second valve group have opposite opening and closing states.

2. The cooling system according to claim 1, characterized in that The cooling system further comprises the refrigeration circuit and the cooling circuit, the cooling circuit comprises the first cooling circuit, the second cooling circuit and the third cooling circuit, the refrigerant flows through the refrigeration circuit, and the coolant flows through the cooling circuit; The refrigeration circuit comprises a first main circuit, wherein the first main circuit comprises a compressor, a condenser, a first throttling device and the first heat exchange part connected in series in sequence; The first cooling circuit includes the second heat exchange part, a first liquid pump, the energy storage battery module of the charging pile and a third valve group; The second cooling circuit includes a second main circuit; the first valve group is opened, and the second main circuit includes the second heat exchanger and the third heat exchanger, the second liquid pump, and the power conversion module of the charging pile; or, the first valve group is closed, and the second main circuit includes the second heat exchanger, the second liquid pump, and the power conversion module of the charging pile; The third cooling circuit includes the third heat exchanger, the second valve group, the first liquid pump and the energy storage battery module of the charging pile.

3. The cooling system according to claim 2, characterized in that The cooling system further includes a fourth heat exchanger, the cooling circuit further includes a fourth cooling circuit, and the second cooling circuit further includes a first branch; The fourth heat exchanger includes a third heat exchange part and a fourth heat exchange part. The third heat exchange part is arranged in the first branch. The fourth heat exchange part is connected in series with the charging gun module of the charging pile through the fourth cooling circuit. The first branch is connected in parallel to both ends of the power conversion module of the charging pile.

4. The cooling system according to claim 3, characterized in that The fourth cooling circuit includes the fourth heat exchange unit, a third liquid pump and the charging gun module of the charging pile.

5. The cooling system according to claim 4, characterized in that The cooling system has a first refrigeration mode, a second refrigeration mode, a third refrigeration mode and a fourth refrigeration mode; In the first refrigeration mode, the first valve group is closed, the second valve group is opened, the third valve group is closed, the compressor stops running, the first liquid pump and the second liquid pump are running, and the third liquid pump stops running; the refrigeration circuit and the first cooling circuit are in a cut-off state, the second cooling circuit is in a conducting state, the third cooling circuit is in a conducting state, and the fourth cooling circuit is in a cut-off state; In the second refrigeration mode, the first valve group is closed, the second valve group is opened, the third valve group is opened, the compressor is running, the first liquid pump and the second liquid pump are running, and the third liquid pump is stopped; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a conducting state, and the fourth cooling circuit is in a cut-off state; In the third refrigeration mode, the first valve group is opened, the second valve group is closed, the third valve group is opened, the compressor is running, the first liquid pump and the second liquid pump are running, and the third liquid pump is stopped; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a blocked state, and the fourth cooling circuit is in a blocked state; In the fourth refrigeration mode, the first valve group is opened, the second valve group is closed, the third valve group is opened, the compressor is running, and the first liquid pump, the second liquid pump and the third liquid pump are running; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a cut-off state, and the fourth cooling circuit is in a conducting state.

6. The cooling system according to claim 5, characterized in that When the external environment temperature is less than 10°C and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the first cooling mode; or, When the external environment temperature is greater than or equal to 10°C and less than 18°C, and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the second cooling mode; or, When the external environment temperature is greater than or equal to 18°C ​​and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the third cooling mode; or, When the external environment temperature is less than 50° C. and the energy storage battery of the charging pile is in a discharging state, the cooling system operates in the fourth cooling mode.

7. The cooling system according to claim 4, characterized in that The cooling system further includes a fifth heat exchanger, and the refrigeration circuit further includes a second branch; The fifth heat exchanger includes a fifth heat exchange part and a sixth heat exchange part, the fifth heat exchange part flows the refrigerant, and the sixth heat exchange part flows the coolant; the sixth heat exchange part is arranged between the coolant outlet of the power conversion module and the coolant inlet of the second heat exchanger; The second branch is connected in parallel to both ends of the first heat exchange part, and the second branch includes the fifth heat exchange part and a second throttling device. In the flow direction of the refrigerant, the second throttling device is arranged before the fifth heat exchange part.

8. The cooling system according to claim 7, characterized in that The cooling system has a fifth refrigeration mode. In the fifth refrigeration mode, the first valve group is opened, the second valve group is closed, the third valve group is opened, the second throttling device is opened, the compressor is running, and the first liquid pump, the second liquid pump and the third liquid pump are running; the refrigeration circuit and the first cooling circuit are in a conducting state, the second cooling circuit is in a conducting state, the third cooling circuit is in a cut-off state, and the fourth cooling circuit is in a conducting state.

9. The cooling system according to claim 8, characterized in that When the external environment temperature is greater than or equal to 50° C. and the energy storage battery of the charging pile is in a charging state, the cooling system operates in the fifth cooling mode.

10. The cooling system according to any one of claims 1 to 9, characterized in that: The cooling system also includes a temperature sensor and a control module. The temperature sensor is used to detect the external environment temperature. The control module determines the cooling mode of the cooling system according to the external environment temperature and the operating state of the energy storage battery of the charging pile.

11. The cooling system according to any one of claims 2 to 9, characterized in that: The cooling system further comprises a fan, and the fan is used for dissipating heat of the condenser.

12. A charging pile, characterized in that: It comprises a cooling system as described in any one of claims 1 to 11, and the cooling system is used for heat dissipation of the charging pile.

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