Cooling system and charging pile

Abstract

The invention provides a cooling system and a charging pile, the cooling system comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger comprises a first heat exchange part and a second heat exchange part, and the second heat exchange part is connected in series with an energy storage battery module of the charging pile through a first cooling loop; the second heat exchanger is connected in series with a power conversion module of the charging pile through a second cooling loop; the third heat exchanger and the second heat exchanger are connected in parallel through a first valve group, the third heat exchanger and an energy storage battery module of the charging pile are connected in series through a third cooling loop, and the third cooling loop comprises a second valve group; and the first valve group and the second valve group have opposite opening and closing states. The cooling system combines two cooling modes of refrigerant cooling and natural cooling, the refrigeration mode of the cooling system can be adaptively adjusted, and the energy consumption of the cooling system can be reduced.

Description

Technical Field

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

[0002] The integration of energy storage and charging in charging piles is one of the ways to achieve fast charging. As the power of charging piles increases and the charging speed increases, the heat generated during the energy conversion process increases significantly. Excessive temperature will cause equipment performance to decline and may also cause safety hazards. Therefore, charging piles need to use a cooling system to improve heat dissipation efficiency.

[0003] However, the current cooling mode of the charging pile cooling system is relatively simple and cannot be adjusted according to the working status 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 that the current charging pile cooling system has a relatively single refrigeration mode and a high energy consumption of the cooling system.

[0005] In order to solve the above technical problems, the technical solution adopted in this application is as follows: In a first aspect, the present application provides a cooling system, comprising: 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 circulates a refrigerant, and the second heat exchange part circulates a coolant; the first heat exchange part is connected in series to a refrigeration circuit, and the second heat exchange part is connected in series to an energy storage battery module of a charging pile through a first cooling circuit; a second heat exchanger, the second heat exchanger is a natural cooler, and the second heat exchanger is connected in series to a power conversion module of the charging pile through a second cooling circuit; a third heat exchanger, the third heat exchanger is a natural cooler, the third heat exchanger is connected in parallel to the second heat exchanger through a first valve group, the third heat exchanger is connected in series to the energy storage battery module of the charging pile through a third cooling circuit, and the third cooling circuit comprises a second valve group; wherein the first valve group and the second valve group have opposite opening and closing states.

[0006] In one embodiment, the cooling system also 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 a refrigerant, and the cooling circuit circulates a coolant; the refrigeration circuit includes a first main circuit, the first main circuit 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 circuit; the first valve group is opened, the second main circuit includes a second heat exchanger and a third heat exchanger, a second liquid pump, and a power conversion module of the charging pile; or, the first valve group is closed, the second main circuit 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.

[0007] In one embodiment, the cooling system also includes a fourth heat exchanger, the cooling circuit also includes a fourth cooling circuit, and the second cooling circuit also 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, and the first branch is connected in parallel to both ends of the power conversion module of the charging pile.

[0008] In one embodiment, the fourth cooling circuit includes a fourth heat exchange unit, a third liquid pump, and a charging gun module of the charging pile.

[0009] 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 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 runs, 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 conducting state, the second cooling circuit is in a conducting state, and the third cooling circuit is in a cut-off state. The 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 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 opened, the second valve group is closed, the third valve group is opened, the compressor is running, 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.

[0010] 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 a first cooling 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 a second cooling 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 a third cooling 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 a fourth cooling mode.

[0011] In one embodiment, the cooling system also includes a fifth heat exchanger, and the refrigeration circuit also 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 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, the second branch includes the fifth heat exchange part and the second throttling device, and in the circulation direction of the refrigerant, the second throttling device is arranged before the fifth heat exchange part.

[0012] 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 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.

[0013] In one embodiment, 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.

[0014] 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. The control module determines the cooling mode of the cooling system according to the external ambient temperature and the operating state of the energy storage battery of the charging pile.

[0015] In one embodiment, the cooling system further includes a fan, and the fan is used to dissipate heat from the condenser.

[0016] In a second aspect, the present application further provides a charging pile, comprising the cooling system of the first aspect, the cooling system being used for heat dissipation of the charging pile.

[0017] Different from the related art, the beneficial effect of the implementation mode of the present application is: the cooling system provided by the present application combines the two cooling methods of refrigerant cooling and natural cooling. The natural cooling method can be used in the energy storage battery module 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, the cooling mode of the cooling system can be adaptively adjusted according to the ambient temperature of the charging pile and the heat generation of the energy storage battery module and the power conversion module, which is beneficial to the heat dissipation of the energy storage battery module and the power conversion module, and is beneficial to maintaining the normal working state of the charging pile, and is beneficial to reducing the energy consumption of the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 is a state diagram of the cooling system of the present application in the first cooling mode; Figure 2 is a state diagram of the cooling system of the present application in the second cooling mode; Figure 3 is a state diagram of the cooling system of the present application in the third cooling mode or the fourth cooling mode; Figure 4 This is a state diagram of the cooling system of the present application in the fifth cooling mode.

[0019] In the accompanying drawings: 1, refrigeration circuit; 1a, first main circuit; 1b, second branch circuit; 2, first cooling circuit; 3, second cooling circuit; 3a, second main circuit; 3b, first branch circuit; 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 DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 therefore cannot be understood as a limitation on the present 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 indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] The integrated energy storage and charging charging pile is one of the solutions to achieve fast charging of electric vehicles. This solution can reduce the problem of limited charging power due to grid load restrictions. The integrated energy storage charging pile is usually equipped with a large-capacity energy storage battery and a high-power power conversion module, which can provide a higher output power and greatly shorten the charging time. At the same time, high power also leads to increased heat generation in the charging pile, which mainly involves 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 is required. In related technologies, the energy storage battery module is usually cooled by a compressor refrigeration system, and the compressor refrigeration system needs to be open all year round, resulting in high energy consumption of the cooling system.

[0026] Charging piles that integrate energy storage and charging usually have three working states: supercharging, fast charging, and energy replenishment. Supercharging means that the charging pile outputs electrical energy at super high power, and the output power can reach more than 400kW; fast charging means that the charging pile outputs electrical energy at a relatively high power, and the output power is around 30kW~100kW; energy replenishment means that the power grid replenishes electrical energy to the energy storage battery of the charging pile. Among them, in the supercharging and fast charging states, the output power is high and the heat generation is more; in the energy replenishment state, the power of the power grid charging the energy storage battery is low, so the heat generation is relatively small. Therefore, under different working conditions, the charging pile has differences in heat generation, and the cooling system can be adaptively adjusted accordingly.

[0027] Based on this, this application provides a cooling system and a charging pile, please refer to Figures 1 to 4 , Figures 1 to 4 The state diagram of the cooling system of the present application in different cooling 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 flows refrigerant, the second heat exchange part 10b flows coolant, the first heat exchange part 10a is connected in series with the refrigeration circuit, and the second heat exchange part 10b is connected in series with the energy storage battery module of the charging pile through the first cooling circuit 2; the second heat exchanger 20, the second heat exchanger 20 is a natural cooler, and the second heat exchanger 20 is connected in series with the power conversion module of the charging pile through the second cooling circuit 3; the third heat exchanger 30, the third heat exchanger 30 is a natural cooler, the third heat exchanger 30 is connected in parallel with the second heat exchanger 20 through the first valve group 1F, and the third heat exchanger 30 is connected in series with the energy storage battery module of the charging pile through the third cooling circuit 4, and the third cooling circuit 4 includes a second valve group 2F; wherein, the first valve group 1F and the second valve group 2F have opposite opening and closing states.

[0028] The first heat exchanger 10 can utilize the heat exchange between the refrigerant and the coolant to reduce the temperature of the coolant flowing through the second heat exchange part 10b to a lower 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, the cooling demand of the energy storage battery is met; the second heat exchanger 20 and the third heat exchanger 30 are natural coolers. A natural cooler is a cooling device that utilizes the medium and physical principles in the natural environment and does not require additional power to 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 purpose of cooling. Therefore, the second heat exchanger 20 and the third heat exchanger 30 have lower 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.

[0029] The power conversion module of the charging pile is usually cooled by a coolant at a relatively high temperature, so it can provide cooling capacity by natural cooling. Among them, the third heat exchanger 30 is connected in parallel with the second heat exchanger 20 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, and 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 demand 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 is increased, 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 demand of the power conversion module.

[0030] 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 open; when the second valve group 2F is open, the first valve group 1F is closed. When the first valve group 1F is closed and the second valve group 2F is open, 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 cooling task of the energy storage battery module. In actual use, when the external ambient temperature is low, such as in winter, spring and autumn, when natural cooling can provide more cooling capacity and the energy storage battery generates less heat, natural cooling is used to provide part or all of the cooling capacity for the energy storage battery module. On the premise of being able to meet the heat dissipation requirements of the energy storage battery module, the energy consumption generated by the refrigerant cooling method can be reduced. Among them, Figure 1 As shown, the first valve group 1F and the second valve group 2F may include two valve components respectively, and the types of the first valve group 1F and the second valve group 2F include but are not limited to solenoid valves.

[0031] In summary, the cooling system provided by the present application combines two cooling methods, refrigerant cooling and natural cooling. In the energy storage battery module, natural cooling can be used to undertake part or all of the cooling tasks, and in the power conversion module, the heat exchange area of ​​the natural cooler can be adjusted. Therefore, the cooling mode of the cooling system can be adaptively adjusted according to the ambient temperature of the charging pile and the heat generation of the energy storage battery module and the power conversion module, which is beneficial to the heat dissipation of the energy storage battery module and the power conversion module, and to maintaining the normal working state of the charging pile, and to reducing the energy consumption of the cooling system.

[0032] In one embodiment, the energy storage battery module includes at least one energy storage battery and a heat exchanger of the energy storage battery. The heat exchanger of the energy storage battery includes but is not limited to a liquid cooling pipe, a liquid cooling plate, etc. The heat exchanger has a cooling liquid channel for circulating the cooling liquid. The heat exchanger is in direct contact with the energy storage battery, which is conducive to improving the heat exchange efficiency and uniformity of the heat exchange.

[0033] 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 a heat exchanger, and the DC\DC conversion module includes a DC\DC converter and a heat exchanger. The heat exchanger includes but is not limited to a liquid cooling pipe, a liquid cooling plate, etc. The heat exchanger has a cooling liquid channel for circulating the cooling liquid. The heat exchanger is in direct contact with the AC\DC converter and the DC\DC converter, which is conducive to improving the heat exchange efficiency and uniformity.

[0034] 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 supply for the subsequent charging of the electrical equipment. The DC / DC converter can further process the direct current and adjust and stabilize the voltage 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 direct current parameters (such as voltage, current, etc.) output by the AC / DC converter have met the charging requirements of the energy storage battery of the electrical equipment.

[0035] 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 conducive to improving the heat exchange efficiency; the compact structure and small footprint are conducive to the miniaturization of the cooling system; the operation flexibility is large and the application range is wide, which is conducive 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 they can meet the heat exchange requirements.

[0036] 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 a refrigerant, and the cooling circuit circulates a coolant; the refrigeration circuit 1 includes a first main circuit 1a, the first main circuit 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 a charging pile and a third valve group 3F; the second cooling circuit 3 includes a second main circuit 3a; the first valve group 1F is opened, the second main circuit 3a includes a second heat exchanger 20 and a third heat exchanger 30, a second liquid pump 31, and a power conversion module of a charging pile; or, the first valve group 1F is closed, the second main circuit 3a includes a second heat exchanger 20, a second liquid pump 31, and a power conversion module of a 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 a charging pile.

[0037] The refrigerant circulates in the refrigeration circuit 1. 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 turn it into a high-temperature and high-pressure gas. This high-temperature and high-pressure refrigerant gas has 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, which is the 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 gaseous 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, and heat exchange occurs with the coolant in the first heat exchanger 10. The refrigerant absorbs the heat of the coolant to cool the coolant. Among them, the first throttling device 13 is used to adjust the flow rate of the refrigerant.

[0038] It should be noted that the components included in the refrigeration circuit 1 are only the most basic components constituting the refrigeration circuit 1, and those skilled in the art can add valves, sensors, etc. to the refrigeration circuit 1 according to the needs of actual applications. Among them, the first throttling device 13 includes but is not limited to an electronic expansion valve.

[0039] The first cooling circuit 2 provides cooling for the energy storage battery module, and 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, and the first liquid pump 21 sucks low-temperature coolant from the first heat exchanger 10 and delivers the coolant to the energy storage battery module of the charging pile; the coolant exchanges heat with the energy storage battery in the cooling liquid channel of the energy storage battery module and absorbs the heat generated by the energy storage battery; the coolant then flows back to the first heat exchanger 10, is cooled and then circulated again. 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 to turn on or off the first cooling circuit 2 according to actual usage. Figure 1 As shown, the number of valves in the third valve group 3F can be 1, and the types of the third valve group 3F include but are not limited to solenoid valves. In actual use, when the ambient temperature is low, such as in winter, natural cooling can provide more cooling capacity, and when the energy storage battery is in the energy replenishment stage and produces less heat, the third valve group 3F is closed, the first cooling circuit 2 is cut off, and the compressor 11 stops working, and the refrigeration circuit 1 is also cut off, which is conducive to reducing the energy consumption of the compressor 11.

[0040] In one embodiment, the liquid inlet of the refrigerant in the first heat exchange part 10a and the liquid outlet of the cooling liquid 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 cooling liquid 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 cooling liquid adopt a countercurrent heat exchange method, which is conducive to improving the heat transfer efficiency.

[0041] 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 cooling demand of the cooling system. When the heat generated inside the charging pile is large and a stronger cooling effect is required, the compressor 11 can speed up the operation speed, increase the circulation flow and pressure of the refrigerant, and thus increase the cooling capacity; when the temperature is close to the normal operating temperature of the energy storage battery module or the load is low, the compressor 11 can reduce the operating speed and reduce the cooling capacity to achieve the purpose of energy saving.

[0042] The second cooling circuit 3 provides cooling for 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 explained: 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 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; the coolant then flows back to the second heat exchanger 20, is cooled and circulated again.

[0043] 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 increasing the heat exchange area, thereby accelerating the heat exchange rate and increasing the cooling capacity. In addition, the circulation process of the coolant is the same as when the second valve is closed, and the above description can be referred to, which will not be repeated here.

[0044] The third cooling circuit 4 provides cooling for 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, and the first liquid pump 21 sucks 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 cooling liquid 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 circulated again.

[0045] Therefore, in the cooling system provided by the present application, the first cooling circuit 2 and the third cooling circuit 4 can provide cooling for the energy storage battery module separately or simultaneously, and the energy storage battery module adopts refrigerant cooling, natural cooling or a combination of the two; the second cooling circuit 3 provides cooling for the power conversion module, and the heat exchange area of ​​the natural heat exchanger in the second cooling circuit 3 is adjustable, so that the cooling capacity provided by the second cooling circuit 3 to the power conversion module is adjustable. The pipeline setting of the above cooling system is the basis for realizing multiple cooling modes of the cooling system, so that the cooling system can adaptively adjust its cooling mode according to the external ambient temperature and the heat generation of each module of the charging pile, which is beneficial to maintain the normal working state of the charging pile and reduce the energy consumption of the cooling system.

[0046] In one embodiment, the cooling system also includes a fourth heat exchanger 40, the cooling circuit also includes a fourth cooling circuit 5, and the second cooling circuit 3 also 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 to the two ends of the power conversion module of the charging pile.

[0047] The fourth heat exchanger 40 is a place where the coolant in the first branch 3b and the coolant in the fourth cooling loop 5 exchange heat. For the convenience of description, the coolant in the second cooling loop 3 is called the first coolant, and the coolant in the fourth cooling loop 5 is called the second coolant. The first branch 3b is connected in parallel to the two 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 after natural cooling. The above-mentioned low-temperature coolant can absorb the heat of the second coolant flowing through the fourth heat exchange part 40b, so that the temperature of the second coolant is reduced; when the energy storage battery of the charging pile is in a discharge state, the charging pile supplies power to the electrical equipment through the charging gun module. At this time, the charging gun module will also generate heat, and the second coolant with a lower temperature can absorb the heat generated by the charging gun module to achieve the purpose of cooling the charging gun module.

[0048] In one embodiment, the charging gun module includes at least one charging gun and a heat exchanger of the charging gun. 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 a liquid cooling pipe, a liquid cooling plate, etc. The heat exchanger has a coolant channel for circulating the coolant, and the heat exchanger is in direct contact with the charging gun, which is conducive to improving the heat exchange efficiency and uniformity of the heat exchange.

[0049] In one embodiment, the first coolant and the second coolant are of different types. For example, the first coolant is water and the second coolant is oil. Through the above configuration, different cooling requirements of the power conversion module and the charging gun module can be met. In other embodiments, the first coolant and the second coolant may also be of the same type.

[0050] In one embodiment, the fourth cooling circuit 5 includes a fourth heat exchange unit 40 b , a third liquid pump 51 , and a charging gun module of the charging pile.

[0051] The fourth cooling loop 5 provides cooling for the charging gun module, and the circulation process of the second coolant in the fourth cooling loop 5 is as follows: in the fourth cooling loop 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 loop, and the third liquid pump 51 draws 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 cooling liquid 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 circulated again.

[0052] By setting up the fourth cooling circuit 5, cooling can be provided for the charging gun, thereby reducing its temperature when supplying power to electrical equipment and maintaining the normal working state of the charging gun; at the same time, the fourth cooling circuit 5 allows the coolant for cooling the charging gun module and the coolant for cooling the power conversion module to be made of different materials, thereby meeting the differentiated cooling needs of different modules.

[0053] In one embodiment, the cooling system also includes a fifth heat exchanger 50, and the refrigeration circuit 1 also 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 refrigerant, and the sixth heat exchange part 50b circulates 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 to both ends of the first heat exchange part 10a, the second branch 1b includes the fifth heat exchange part 50a and the second throttling device 14, and in the circulation direction of the refrigerant, the second throttling device 14 is arranged before the fifth heat exchange part 50a.

[0054] When the refrigeration circuit 1 includes the first main circuit 1a and the second branch circuit 1b, based on the refrigerant circulation process in the first main circuit 1a, after the liquid refrigerant flows out from the condenser 12, a part of it passes through the first throttling device 13 and flows to the first heat exchange part 10a of the first heat exchanger 10 through the first main circuit 1a, and a part of it passes through the second throttling device 14 and flows to the fifth heat exchange part 50a of the fifth heat exchanger 50 through the second branch circuit 1b; the two parts of the refrigerant exchange heat with the coolant of the second heat exchange part 10b and the sixth heat exchange part 50b respectively, and then 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 circuit 1a and the second branch circuit 1b, so as to adjust the cooling capacity of the first main circuit 1a and the second branch circuit 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.

[0055] During actual use, when the external ambient temperature is high, such as in hot summer weather, when the natural cooling can provide less cooling and the charging pile generates more heat, refrigerant cooling (first cooling loop 2) is used to provide cooling for the energy storage battery module, and natural cooling (second cooling loop 3) supplemented by refrigerant cooling (second branch 1b) is used to provide cooling for the power conversion module and the charging gun module, which can make up for the deficiency of natural cooling and enable the cooling system to provide a larger cooling capacity for the charging pile, meeting the cooling requirements of the charging pile in a high temperature environment.

[0056] In a specific embodiment, the cooling system provided in the present application has a first cooling mode, a second cooling mode, a third cooling mode and a fourth cooling mode.

[0057] Example 1: The cooling system is in the first cooling mode See also Figure 1 , Figure 1 This is a state diagram of the cooling system of this application in the first refrigeration mode. In the first refrigeration mode, the first valve group 1F is closed, the second valve group 2F is open, the third valve group 3F is closed, the compressor 11 stops running, the first liquid pump 21 and the second liquid pump 31 are running, and the third liquid pump 51 stops running; the refrigeration circuit 1 and the first cooling circuit 2 are in the cut-off state, the second cooling circuit 3 is in the on state, the third cooling circuit 4 is in the on state, and the fourth cooling circuit 5 is in the cut-off state.

[0058] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a separated state; the compressor 11 stops running, and the refrigeration circuit 1 and the cooling circuit are in a cut-off state, thereby reducing the energy consumption generated by the compressor 11; 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 the heat exchange area is relatively small; the third cooling circuit 4 provides cooling for 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 a natural cooling method. In the first cooling mode, the energy storage battery module and the power conversion module of the charging pile both adopt a natural cooling method, which can significantly reduce the energy consumption of the cooling system; at the same time, the cooling system in the first cooling mode provides less cooling capacity, which can be applied to the working conditions where the external ambient temperature is low and the charging pile is in a replenishing state.

[0059] In one embodiment, when the 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 cooling mode. At this time, the ambient temperature is low, and the natural heat exchanger (i.e., the second heat exchanger 20 and the third heat exchanger 30) can provide a large amount of cooling. At the same time, the charging pile is in a state of replenishing energy, generating less heat, and the charging gun module does not need to be cooled. The first cooling mode can meet the cooling needs of the charging pile and reduce the energy consumption of the cooling system. At this time, the ambient temperature is less than 10°C and the energy storage battery of the charging pile is in a charging state, so the first cooling mode can also be called the winter charging mode.

[0060] Embodiment 2: The cooling system is in the second cooling mode See also Figure 2 , Figure 2 This is a state diagram of the cooling system of this application in the second refrigeration mode. In the second refrigeration mode, the first valve group 1F is closed, the second valve group 2F is open, the third valve group 3F is open, the compressor 11 is running, the first liquid pump 21 and the second liquid pump 31 are running, and the third liquid pump 51 is stopped; the refrigeration circuit 1 and the first cooling circuit 2 are in the on state, the second cooling circuit 3 is in the on state, the third cooling circuit 4 is in the on state, and the fourth cooling circuit 5 is in the off state.

[0061] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a separated state; the compressor 11 is running, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and the third cooling circuit 4 is in a conducting state, so 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 the heat exchange area is small. In the second cooling mode, the energy storage battery module of the charging pile mainly adopts a natural cooling method, and the insufficient cooling capacity is supplemented by the refrigerant cooling method. The power conversion module adopts a natural cooling method, which can reduce the energy consumption of the cooling system; at the same time, compared with the first cooling mode, the cooling capacity provided by the cooling system in the second cooling mode is increased, which can be applied to the working conditions where the external ambient temperature is low and the charging pile is in a replenishing state.

[0062] It should be noted that in the second refrigeration mode, the first cooling circuit 2 and the third cooling circuit 4 both use the first liquid pump 21 to provide circulation power. The first liquid pump 21 may include two flow paths, which are respectively used to circulate the coolant of the first cooling circuit 2 and the coolant of the third cooling circuit 4, or the first liquid pump 21 may include two liquid pumps, one of which is used to circulate the coolant of the first cooling circuit 2, and the other is used to circulate the coolant of the third cooling circuit 4. At the same time, the heat exchanger of the energy storage battery module has a coolant channel corresponding to the first liquid pump 21.

[0063] In one embodiment, when the 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 cooling mode. At this time, the ambient temperature has increased but is still relatively low, and the cooling capacity that can be provided by the natural heat exchanger (i.e., the second heat exchanger 20 and the third heat exchanger 30) is lower than that of the first cooling mode, but it can still provide a large amount of cooling capacity. At the same time, the charging pile is in a state of replenishing energy, generating less heat, and the charging gun module does not need to be cooled. The second cooling mode can meet the cooling needs of the charging pile and reduce the energy consumption of the cooling system. At this time, the 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, so the second cooling mode can also be called the spring and autumn charging mode.

[0064] Example 3: The cooling system is in the third cooling mode See also Figure 3 , Figure 3This is a state diagram of the cooling system of the present application in the third refrigeration mode or the fourth refrigeration mode. In the third refrigeration mode, the first valve group 1F is open, the second valve group 2F is closed, the third valve group 3F is open, the compressor 11 is running, the first liquid pump 21 and the second liquid pump 31 are running, and the third liquid pump 51 is stopped; the refrigeration circuit 1 and the first cooling circuit 2 are in the on state, the second cooling circuit 3 is in the on state, the third cooling circuit 4 is in the off state, and the fourth cooling circuit 5 is in the off state.

[0065] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 is running, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and the third cooling circuit 4 is in a cut-off state, so 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 the heat exchange area is large. In the third cooling mode, the energy storage battery module of the charging pile adopts a refrigerant cooling method, and the power conversion module adopts a natural cooling method, which can provide more cooling capacity; at the same time, compared with the second cooling mode, the cooling capacity provided by the cooling system in the third cooling mode is further increased, which can be applied to the working conditions where the external ambient temperature is high and the charging pile is in a replenishing state.

[0066] In one embodiment, when the 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 cooling mode. At this time, the ambient temperature further increases, and the cooling capacity that can be provided by the natural cooling method is further reduced compared to the first cooling mode. Therefore, it is necessary to provide cooling capacity for the energy storage battery module by refrigerant cooling, and to provide cooling capacity for the power conversion module by natural cooling with a larger heat exchange area. At the same time, the charging pile is in a replenishing state, and the charging gun module does not need to be cooled. The third cooling mode can meet the cooling needs of the charging pile. At this time, the ambient temperature is greater than or equal to 18°C, and the energy storage battery of the charging pile is in a charging state, so the third cooling mode can also be called the summer charging mode.

[0067] Embodiment 4: The cooling system is in the fourth cooling mode Please continue reading Figure 3 In the fourth refrigeration mode, the first valve group 1F is open, the second valve group 2F is closed, the third valve group 3F is open, the compressor 11 is running, the first liquid pump 21, the second liquid pump 31 and the third liquid pump 51 are running; the refrigeration circuit 1 and the first cooling circuit 2 are in the on state, the second cooling circuit 3 is in the on state, the third cooling circuit 4 is in the off state, and the fourth cooling circuit 5 is in the on state.

[0068] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 is running, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and the third cooling circuit 4 is in a cut-off state, so 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 the heat exchange area is large; 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 cooling 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, because in the fourth cooling mode, the cooling system provides cooling for the charging gun module, the fourth cooling mode is suitable for the working condition where the charging pile supplies power to the electrical equipment at normal temperature.

[0069] 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 cooling mode. At this time, the charging pile is in an overcharge state or a fast charge state, generates more heat, and the charging gun module also needs to be cooled. The fourth cooling mode can meet the cooling needs 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, so the fourth cooling mode can also be called a standard discharge mode.

[0070] Example 5: The cooling system is in the fifth cooling mode See also Figure 4 , Figure 4 This is a 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 open, the second valve group 2F is closed, the third valve group 3F is open, the second throttling device 14 is open, the compressor 11 is running, the first liquid pump 21, the second liquid pump 31 and the third liquid pump 51 are running; the refrigeration circuit 1 and the first cooling circuit 2 are in the on state, the second cooling circuit 3 is in the on state, the third cooling circuit 4 is in the off state, and the fourth cooling circuit 5 is in the on state.

[0071] At this time, the second heat exchanger 20 and the third heat exchanger 30 are in a combined state; the compressor 11 is running, the refrigeration circuit 1 and the first cooling circuit 2 are in a conducting state, and the third cooling circuit 4 is in a cut-off state, so 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, and is assisted by the refrigerant cooling of the second branch 1b, that is, the power conversion module is mainly cooled by natural cooling, and is assisted 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 assisted by refrigerant cooling. In the fifth cooling 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 combined with a 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 in ultra-high temperature weather and the charging pile supplies power to electrical equipment.

[0072] In one embodiment, 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. At this time, the charging pile is in a supercharged state or a fast charge state, and the charging gun module also needs to be cooled, generating more heat, and the external environment temperature is 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 lack of cooling capacity of natural cooling, thereby meeting the cooling needs of the charging pile in a high temperature environment and maintaining the normal working state of the charging pile. At this time, the external environment temperature is greater than or equal to 50°C, and the energy storage battery of the charging pile is in a discharging state, so the fifth cooling mode can also be called an ultra-high temperature discharge mode.

[0073] 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 a 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 refrigerant in the second branch 1b, thereby reducing unnecessary cooling consumption and helping to reduce the energy consumption of the cooling system.

[0074] 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. The control module determines the cooling mode of the cooling system according to the external ambient temperature and the operating state of the energy storage battery of the charging pile.

[0075] Among them, the operating states of the energy storage battery include charging state, discharging state and static 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 fast charging state, and the cooling system provides cooling for the energy storage battery, the AC\DC converter and DC\DC converter in the power conversion module, and the charging gun; when the energy storage battery is in the static state, the charging pile is in the non-working state, and the cooling system stops running.

[0076] The control module determines the cooling mode of the cooling system according to the external ambient temperature and the operating status of the energy storage battery of the charging pile. It can adaptively adjust the cooling mode of the cooling system under different working conditions, and reduce the energy consumption of the cooling system while meeting the cooling needs and maintaining the normal operation of the charging pile.

[0077] In one embodiment, the cooling system further includes a fan 15, which is used to dissipate heat from the condenser 12. The fan 15 accelerates air flow to take away the heat dissipated from the condenser 12 to the air, thereby improving heat dissipation efficiency.

[0078] The present application also provides a charging pile, including a cooling system of any of the above embodiments, and the cooling system is used for heat dissipation of the charging pile. The cooling system combines two cooling methods, refrigerant cooling and natural cooling, and can adaptively adjust the cooling method of the cooling system according to the ambient temperature of the charging pile and the working state of the charging pile, which is beneficial to the heat dissipation of the charging pile, thereby maintaining the normal working state of the charging pile, and is beneficial to reducing the energy consumption of the cooling system.

[0079] To further illustrate the advantage of the cooling system of the present application in reducing energy consumption when the external ambient temperature is less than 10°C (in winter), assuming that the charging pile of the present application is used in Shanghai, its energy consumption data is compared with the energy consumption data of the traditional cooling system, as described below for details.

[0080] Please refer to Table 1, which is a table of average temperature data in Shanghai from January to December. It can be seen that the average temperature in Shanghai in January, February and December is less than 10°C. Therefore, in the above three months, the cooling system of the charging pile provided in the present application adopts the first cooling mode in the energy replenishment state, and the cooling system adopts the fourth cooling mode in the supercharging and fast charging states. Based on the cooling mode of the above cooling system, and assuming that the charging pile undergoes 3 full charges and 3 full discharges in a day (experiences 3 complete charging and discharging processes), the energy consumption of the cooling system provided in the present application in January, February and December is calculated; at the same time, the traditional cooling system in which the charging pile adopts a single cooling mode (refrigerant cooling is used to provide cooling for the energy storage battery module, and natural cooling is used to provide cooling for the power conversion module and the charging gun module) in the three states of energy replenishment, supercharging and fast charging is used as a comparison to calculate the corresponding energy consumption of the cooling system at this time, as shown in Tables 2 to 4 for details.

[0081] Table 1 is the average temperature data of Shanghai from January to December

[0082] Table 2 shows the energy consumption of the charging pile cooling system in January

[0083] Note: "Supercharge 1 state" and "Supercharge 2 state" represent the discharge states of two energy storage batteries with different charging speeds, and "recharge state" represents the charging state of the energy storage battery. Supercharge 1 state + Supercharge 2 state + recharge state is a complete charging and discharging process experienced by the charging pile.

[0084] Table 3 shows the energy consumption of the charging pile cooling system in February

[0085] Table 4 shows the energy consumption of the charging pile cooling system in December

[0086] 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=831.036kWh; 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=1368.75kWh. That is, the cooling system of the present application reduces energy consumption by about 40% compared with the traditional cooling system in winter, and saves more than 500kWh of electricity.

[0087] 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 works in the first cooling mode in the charging state, and in the fourth cooling mode in the discharging state. In the charging state, only natural cooling is used to provide cooling for the energy storage battery module and the power conversion module, which can meet the cooling needs of the charging pile without the need to adopt a refrigerant cooling method that consumes more energy. Therefore, compared with traditional cooling systems that use refrigerant cooling to provide cooling for the energy storage battery module regardless of whether it is in the charging state or the discharging state, the energy consumption is significantly reduced.

[0088] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

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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