Cooling system of a charging system and method of controlling the same

Abstract

The application provides a cooling system of a charging system and a control method thereof. The cooling system comprises a vapor compression cooling unit, a forced convection cooling unit, and a fan. The vapor compression cooling unit comprises a compressor, a condenser, a throttling element and an evaporator connected in sequence through a vapor compression pipeline. The forced convection cooling unit comprises a liquid cooling plate, a heat exchanger, the evaporator and a water pump connected through a cooling pipeline. The liquid cooling plate is in close contact with a power module of the charging system. The evaporator comprises a first flow channel and a second flow channel. The evaporator is used for evaporating the refrigerant flowing out of the condenser and performing convection heat exchange between the cooling liquid in the second flow channel and the refrigerant in the first flow channel. The application realizes the cooling of the charging system in the form of the combination of forced convection and vapor compression. The cooling liquid is cooled by the forced convection cooling unit and the vapor compression cooling unit through the convection heat exchange in the evaporator. The energy cascade principle is maximally utilized, and the application has low cost, is environmentally friendly and has high efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical technical field, specifically relates to a charging system of an electric vehicle and a control method of the charging system of the electric vehicle. BACKGROUND

[0002] At present, the charging time of a high-power charging system such as a new energy vehicle is long, and in order to ensure that the power module of the charging system does not overheat during the charging process, the charging system needs to be cooled.

[0003] At present, the cooling method of the charging equipment is mostly air cooling, but the cooling efficiency of this method is low and the cooling effect cannot be guaranteed.

[0004] In the related art, a refrigerant is used to cool the charging system, which can improve the cooling efficiency, but the operation cost is high, and the use of a single refrigerant is not environmentally friendly. SUMMARY

[0005] To solve the above technical problems, the first aspect of the present application provides a cooling system of an electric charging system.

[0006] The second aspect of the present application provides a control method of the cooling system of the charging system.

[0007] The technical scheme adopted by the present application is as follows:

[0008] The first aspect of the present application provides a cooling system of a charging system, comprising: a vapor compression cooling unit, the vapor compression cooling unit comprising: a compressor, a condenser, a throttling element and an evaporator connected in sequence through a vapor compression pipeline, the vapor compression cooling unit adopting a refrigerant cycle; a forced convection cooling unit, the forced convection cooling unit comprising: a liquid cooling plate, a heat exchanger, the evaporator and a water pump connected through a cooling pipeline, the forced convection cooling unit adopting a cooling liquid cycle, the liquid cooling plate being in close contact with a power module of the charging system; wherein the condenser of the vapor compression cooling unit is arranged close to the heat exchanger of the vapor compression cooling unit, and the vapor compression cooling unit and the forced convection cooling unit further comprise: a fan, the fan being arranged opposite to the heat exchanger and the condenser, the fan being used for air cooling of the condenser and the heat exchanger, the vapor compression cooling unit and the forced convection cooling unit sharing one evaporator, the evaporator comprising a first flow channel and a second flow channel, the vapor compression pipeline being communicated with the first flow channel, the cooling pipeline being communicated with the second flow channel, the evaporator being used for evaporating treatment of the refrigerant flowing out of the condenser, and for counterflow heat exchange between the cooling liquid in the second flow channel and the refrigerant in the first flow channel.

[0009] The cooling system of the charging system has the following additional technical features:

[0010] According to an embodiment of the present application, in the forced convection cooling unit, the inlet of the heat exchanger is connected with the outlet of the liquid cooling plate, the outlet of the heat exchanger is connected with the inlet of the second flow channel of the evaporator, and the outlet of the second flow channel of the evaporator is connected with the inlet of the liquid cooling plate through a water pump.

[0011] According to an embodiment of the present application, in the forced convection cooling unit, the second flow channel is further connected with the outlet of the heat exchanger through an electric regulating valve.

[0012] According to an embodiment of the present application, in the forced convection cooling unit, the outlet of the liquid cooling plate is connected with the inlet of the second flow channel of the evaporator through a first one-way valve, the outlet of the second flow channel of the evaporator is connected with the inlet of the liquid cooling plate through the water pump, the outlet of the second flow channel of the evaporator is further connected with the inlet of the heat exchanger, and the outlet of the heat exchanger is connected with the inlet of the second flow channel of the evaporator through a second one-way valve.

[0013] According to an embodiment of the present application, the steam compression pipeline comprises a copper pipe.

[0014] The second aspect embodiment of the present application provides a control method of the cooling system of the charging system, comprising the following steps: acquiring the temperature of the power module of the charging system, controlling the cooling system to start when the temperature of the power module reaches a starting temperature Tsta; acquiring an ambient temperature Tamb, and acquiring a mode selection temperature difference AT according to the starting temperature Tsta and the ambient temperature Tamb, wherein AT=Tamb-Tsta; judging the selection temperature difference AT, wherein if the selection temperature difference AT is greater than a first set temperature K1, the forced convection cooling unit is controlled to start; if the selection temperature difference AT is less than or equal to the first set temperature K1 and greater than or equal to a second set temperature K2, the forced convection cooling unit is controlled to start first, and after a first preset time, the target temperature difference ATt is continuously detected, and if the target temperature difference ATt is greater than a third set temperature K3, the steam compression cooling unit is controlled to start, wherein K1>K2, ATt=Tout-Ttar, Tout is the outlet liquid temperature of the liquid cooling plate, and Ttar is the outlet liquid target temperature of the liquid cooling plate; if the selection temperature difference AT is less than the second set temperature K2, the steam compression cooling unit is controlled to start, or the steam compression cooling unit and the forced convection cooling unit are controlled to start simultaneously.

[0015] The control method of the cooling system of the charging system has the following additional technical features:

[0016] According to one embodiment of the present application, the method further comprises: after the forced convection cooling unit is started, adjusting the water pump flow and the fan rotating speed according to the size and trend of the target temperature difference △Tt; after the vapor compression cooling unit is started, adjusting the frequency of the compressor, and simultaneously adjusting the water pump flow and the fan rotating speed according to the size and trend of the target temperature difference △Tt.

[0017] Advantages of the present application:

[0018] The present application can provide a liquid cooling method for a charging pile, and the cooling system is in a combined form of forced convection and vapor compression, the cooling liquid is cooled by heat exchange through forced convection in the evaporator, the energy cascade principle is maximally utilized, the high-grade energy is fully utilized, the heat exchange efficiency is improved, and the cost is reduced.

[0019] Through the phase change refrigeration method of vapor compression, the temperature of the cooling liquid can be set to a lower temperature according to requirements, the heat exchange efficiency is improved, and the high-power charging heat dissipation requirement is met.

[0020] The cooling system and the charging system only need to be connected through a pipe joint, which is convenient for production and installation, maintenance, and ensures the high protection property of the charging pile, so that the power module is not polluted by external dirty air, and the service life of the power module is prolonged.

[0021] The vapor compression pipeline and the cooling pipeline are independent of each other, and the reliability is high.

[0022] The mixed cooling system can reduce the use rate of the vapor compression unit, reduce the damage to the environment, and is more environmentally friendly.

[0023] The cooling system refrigerant flow is continuously adjusted according to the temperature change of the detection temperature point of the charging system, the working condition change response is rapid, and energy is saved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of a cooling system of a charging system according to a first embodiment of the present application;

[0025] Figure 2 is a structural schematic view of a cooling system of a charging system according to a second embodiment of the present application;

[0026] Figure 3 is a structural schematic view of a cooling system of a charging system according to a third embodiment of the present application;

[0027] Figure 4 is a structural schematic view of a cooling system of a charging system according to a fourth embodiment of the present application;

[0028] Figure 5is a flow chart of a control method of a cooling system of a charging system according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0030] Figure 1 is a structural schematic diagram of a cooling system of a charging system according to a first embodiment of the present application; Figure 2 is a structural schematic diagram of a cooling system of a charging system according to a second embodiment of the present application; Figure 3 is a structural schematic diagram of a cooling system of a charging system according to a third embodiment of the present application; Figure 4 is a structural schematic diagram of a cooling system of a charging system according to a fourth embodiment of the present application. As shown in the figure, the charging system comprises a vapor compression cooling unit and a forced convection cooling unit. Figures 1-4

[0031] The vapor compression cooling unit comprises a compressor 1, a condenser 2, a throttling element 3, an evaporator 4 and various sensors (P and T) and refrigeration accessories connected in sequence through a vapor compression pipeline. The vapor compression cooling unit adopts refrigerant circulation. Figures 1-4 The forced convection cooling unit comprises a liquid cooling plate 5, a heat exchanger 6, the evaporator 4 and a water pump 7 connected through a cooling pipeline. The forced convection cooling unit adopts cooling liquid (for example, water) circulation. The liquid cooling plate 5 is tightly attached to the power module 100 of the charging system.

[0032] The condenser 2 of the vapor compression cooling unit is arranged close to the heat exchanger 6 of the vapor compression cooling unit. The vapor compression cooling unit and the forced convection cooling unit further comprise a fan 8 arranged opposite to the heat exchanger 6 and the condenser 2. The fan 8 is used for air cooling of the condenser 2 and the heat exchanger 6. The vapor compression cooling unit and the forced convection cooling unit share one evaporator 4. The evaporator 4 comprises a first flow channel and a second flow channel. The vapor compression pipeline is communicated with the first flow channel, and the cooling pipeline is communicated with the second flow channel. The evaporator 4 is used for evaporating treatment of the refrigerant flowing out of the condenser 2, and for counterflow heat exchange between the cooling liquid in the second flow channel and the refrigerant in the first flow channel.

[0033] The vapor compression pipeline can comprise a copper pipe.

[0034] Specifically, as shown in the figure, Figures 1-4 ​As shown, the heat exchanger of the forced convection cooling unit and the condenser of the vapor compression cooling unit can be integrally formed, separately assembled, crossed, staggered, arranged in front of each other, or various combinations. Figure 1 One of the cross-integrated combination modes is shown in the figure, wherein the heat exchanger 6 and the condenser 2 are integrally formed and crossed. Figure 2 One of the cross-integrated combination modes is shown in the figure, wherein the heat exchanger 6 and the condenser 2 are integrally formed and crossed.

[0035] The cooling mode of the charging pile system of the present application is liquid cooling, the power module 100 is closely attached to the liquid cooling plate 5, the liquid cooling plate 5 is designed with an inlet and an outlet, and the liquid cooling plate 5 is provided with a through micro channel, and the heat of the power module 100 is taken away by the low-temperature cooling liquid flowing in.

[0036] The working process of the vapor compression cooling unit is as follows: the low-pressure gaseous refrigerant is sucked into the compressor 1 and compressed into high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant flows to the condenser 2 and gradually condenses into high-pressure liquid refrigerant, and the condenser releases heat which is taken away by the fan 8. The condensed high-pressure liquid refrigerant is reduced in pressure and temperature by the throttling element 3 to become a low-temperature and low-pressure gas-liquid mixture, the gas-liquid mixed refrigerant enters the evaporator 4, evaporates (boils) in the evaporator 4 to absorb heat, and the refrigerant becomes low-pressure gas again and reenters the compressor 1, thus forming a cycle.

[0037] In the present application, the vapor compression cooling unit and the forced convection cooling unit can have various combination modes, and the present application takes four modes as examples, but is not limited thereto. Figures 1-4

[0038] In one embodiment of the present application, as shown in the figure, in the forced convection cooling unit, the inlet of the heat exchanger 6 is connected to the outlet of the liquid cooling plate 5, the outlet of the heat exchanger 6 is connected to the inlet of the second flow channel of the evaporator 4, and the outlet of the second flow channel of the evaporator 4 is connected to the inlet of the liquid cooling plate 5 through the water pump 7. Figures 1-2 Specifically,

[0039] The working process of the forced convection cooling unit in the figures and is as follows: the high-temperature cooling liquid flows out of the liquid cooling plate, flows into the heat exchanger 6, and is forced to air-cool by the fan 8 to become medium-temperature cooling liquid, then flows through the second flow channel of the evaporator 4, and exchanges heat with the refrigerant in the first flow channel in the evaporator 4 to become low-temperature cooling liquid, the low-temperature cooling liquid flows into the liquid cooling plate to exchange heat with the power module 100, takes away the heat generated by the power module 100, and the power of the cooling liquid circuit is provided by the water pump 7, and whether a water tank is assembled is determined according to the situation. Figure 1 2 This mode maximizes the use of the principle of energy cascade, fully plays the role of high-grade energy, improves the heat exchange efficiency, and reduces the cost.

[0040] In one embodiment of the present application, as shown in the figure, Figure 3 ​​As shown in the forced convection cooling unit, the second flow channel is also connected with the outlet of the heat exchanger 6 through the electric regulating valve Q.

[0041] Specifically, referring to Figure 3 , the high-temperature cooling liquid flows out of the liquid cooling plate 5 and flows into the heat exchanger 6, and then is divided into two paths, the first path flows into the second flow channel of the evaporator 4, and the second path merges with the first path at the outlet of the evaporator 4 to form one path, and the flow distribution can be realized by the electric regulating valve Q and other ways. The cooling liquid in the one path flows into the liquid cooling plate 5 and exchanges heat with the liquid cooling plate 5 in a convection manner, thereby taking away the heat of the power module 100. The power of the forced convection cooling unit is provided by the water pump 7, and whether a water tank is installed is determined according to the situation. This way can greatly exert the role of high-grade energy and reduce the pipeline resistance and the power consumption of the water pump according to the situation.

[0042] According to one embodiment of the present application, as Figure 4 shown in the forced convection cooling unit, the outlet of the liquid cooling plate 5 is connected with the inlet of the second flow channel of the evaporator 4 through the first one-way valve Q1, the outlet of the second flow channel of the evaporator 4 is connected with the inlet of the liquid cooling plate 5 through the water pump 7, and the outlet of the second flow channel of the evaporator 4 is also connected with the inlet of the heat exchanger 6. The outlet of the heat exchanger 6 is connected with the inlet of the second flow channel of the evaporator 4 through the second one-way valve Q2.

[0043] Specifically, as Figure 4 shown, the cooling liquid flows out of the liquid cooling plate 5 and is first divided into two paths to flow into the heat exchanger 6 and the second flow channel of the evaporator 4, respectively. The flow distribution can be realized by the electric regulating valve and other ways. Then, the two paths of the cooling liquid that flow out are merged into one path to flow into the liquid cooling plate 5 and exchange heat with the liquid cooling plate 5 in a convection manner, thereby taking away the heat of the power module 100. The power of the forced convection cooling unit is provided by the water pump 7, and whether a water tank is installed is determined according to the situation. This way can greatly exert the role of high-grade energy, greatly reduce the pipeline resistance, and reduce the power consumption of the water pump.

[0044] The cooling system can control the start and stop and frequency regulation of the vapor compression cooling unit according to the working condition of the charging system. In a low working condition, the vapor compression cooling unit is turned off to reduce power consumption. In a high working condition, the vapor compression cooling unit is started, and the frequency regulation is adjusted according to the situation to compensate for the insufficient cooling capacity of the forced air cooling system and meet the cooling requirements of high-power charging. The liquid pump start and stop, the cooling system start and stop, and the adjustment can be controlled according to the output signals of the start and stop of the charging system or the temperature monitoring points.

[0045] In summary, the cooling system of the charging system according to the embodiment of the present application can provide liquid cooling for the charging pile, and the cooling system is in a combined form of forced convection and vapor compression, the cooling liquid is cooled by heat exchange and convection in the evaporator through the forced convection cooling unit and the vapor compression cooling unit, the energy cascade principle is maximally utilized, the high-grade energy is fully utilized, the heat exchange efficiency is improved, and the cost is reduced; through the phase change refrigeration mode of vapor compression, the temperature of the cooling liquid can be set to a lower temperature according to requirements, the heat exchange efficiency is improved, the high-power charging heat dissipation requirement is met; the cooling system and the charging system only need to be connected through a pipe joint, which is convenient for production and installation, post-maintenance, and ensures the high protection property of the charging pile, and the power module 100 is not polluted by external dirty air, and the service life of the power module 100 is prolonged; the vapor compression pipeline and the cooling pipeline are independent of each other, and the reliability is high; the hybrid cooling system can reduce the use rate of the vapor compression unit, reduce the damage to the environment, and is more environmentally friendly; the cooling system refrigerant flow can be infinitely adjusted according to the temperature change of the detection temperature point of the charging system, the working condition change response is rapid, and energy is saved.

[0046] Based on the cooling system of the charging system described above, the present application further provides a control method of the cooling system of the charging system.

[0047] Figure 5 The flow chart of the control method of the cooling system of the charging system according to an embodiment of the present application is shown in FIG. 1, and the method comprises the following steps: Figure 5

[0048] S1, the temperature of the power module of the charging system is obtained, and when the temperature of the power module reaches the starting temperature Tsta, the cooling system is controlled to start.

[0049] The starting temperature Tsta is set according to the specific conditions of the power module of the charging system.

[0050] S2, the ambient temperature Tamb is obtained, and the mode selection temperature difference AT is obtained according to the starting temperature Tsta and the ambient temperature Tamb, wherein AT = Tamb-Tsta.

[0051] S3, the selection temperature difference AT is judged.

[0052] S4, if the selection temperature difference AT is greater than the first set temperature K1, the forced convection cooling unit is controlled to start. K1 can be a temperature between 10-30℃.

[0053] ​S5, if the selected temperature difference AT is less than or equal to the first set temperature K1 and greater than or equal to the second set temperature K2, then the forced convection cooling unit is first controlled to start, and after a first preset time, the target temperature difference ATt is continuously detected, and if the target temperature difference ATt is greater than the third set temperature K3, then the vapor compression cooling unit is controlled to start, wherein K1>K2, ATt=Tout-Ttar, Tout is the liquid outlet temperature of the liquid cooling plate, and Ttar is the liquid outlet target temperature of the liquid cooling plate.

[0054] K2 can be a temperature between 0 and K1, K3 can be a temperature between 3 and 15, and the first preset time can be 3-10 min.

[0055] S6, if the selected temperature difference AT is less than the second set temperature K2, then the vapor compression cooling unit is controlled to start, or the vapor compression cooling unit and the forced convection cooling unit are simultaneously controlled to start.

[0056] According to one embodiment of the present application, the above-mentioned control method can further comprise: after the forced convection cooling unit starts, adjusting the water pump flow rate and the fan speed according to the size and trend of the target temperature difference ATt; and after the vapor compression cooling unit starts, adjusting the frequency of the compressor, the water pump flow rate, and the fan speed according to the size and trend of the target temperature difference ATt.

[0057] Specifically, the adjustment of the frequency of the compressor, the water pump flow rate, and the fan speed is positively correlated with the target temperature difference ATt. The adjustment can be determined according to the specific value of the target temperature difference ATt, or can be determined according to the temperature interval to which the target temperature difference ATt belongs.

[0058] The above-mentioned method is mainly controlled according to the liquid outlet temperature of the liquid cooling plate, and a control mode according to the temperature of the power module and other control modes can also be used, and parameter adjustment can be made according to the object of control and the technical specifications of the power module.

[0059] It can be understood that the vapor compression cooling unit of the present application is an auxiliary cooling unit, and when the forced convection cooling unit cannot achieve the required cooling effect, the vapor compression cooling unit is started to assist in cooling.

[0060] In summary, the control method of the cooling system of the charging system according to the embodiment of the present application can infinitely adjust the refrigerant flow rate of the cooling system according to the temperature change of the detected temperature point of the charging system, and the working condition changes quickly and energy is saved.

[0061] In the description of the application, it should be understood that the terms "first", "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0062] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0064] Any process or method descriptions in flow charts or otherwise described herein represent embodiments of examples that can be implemented as code (e.g., instructions for execution by a processor or other machine) for implementation by a machine and that include the functional block components that carry out the functions specified in the flow charts or other description. The alternative implementations of the preferred embodiments of the present application include performing the functions described by the other means, in no particular order, including substantially simultaneously or in reverse order, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0065] The logic and / or steps represented in flow diagrams or otherwise described herein, for example, can be considered as a sequence of instructions to implement logic functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this specification, a "computer-readable medium" can be any means that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a machine-readable storage device (e.g., magnetic, optical or other) a machine-readable storage diskette (e.g., floppy, flexible or other), a machine-readable storage card (e.g., ROM, EEPROM, flash memory or other), a machine- readable storage tape (e.g., magnetic, optical or other), a machine-readable storage medium (e.g., a portable electronic device, a computer diskette, a computer memory, a broadcast transmission, or the like), or a machine-readable interface device (e.g., a wireless link, optical link or other). The computer-readable medium can also be, or be included in, a computer program product apparatus that tangibly embodies the programming of instructions. The instructions can be executable by a processor of the instruction execution system, apparatus, or device. In another embodiment, the logic and / or steps represented in flow diagrams or otherwise described herein can be considered as a sequence of logic elements, such as steps, functions, or the like, that can be embodied in any computer-readable medium for execution by an instruction execution system, apparatus, or device.

[0066] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. As such, in some embodiments, the memory can include program instructions (i.e., software) stored therein, which when executed by the instruction execution system, causes the instruction execution system to perform at least a portion of the steps or methods described herein. Alternatively, in other embodiments, the steps or methods described herein can be implemented using special purpose logic circuitry, for example, as described in more detail below, without resort to software instructions. As such, the disclosure can be embodied in a variety of ways.

[0067] Those of skill in the art would understand that information and signals can be represented using any of a variety of technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0068] In addition, each function unit in each embodiment of the present application can be integrated in one processing module, or each unit can exist physically separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware, or in the form of software function module. When the integrated module is realized in the form of software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0069] Although the embodiments of the present application have been shown and described above, it should be understood by those ordinary skilled in the art that the above embodiments are exemplary and cannot be understood as limiting the present application, and those ordinary skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A cooling system for a charging system, characterized in that, include: A vapor compression cooling unit, comprising: a compressor, a condenser, a throttling element, and an evaporator connected in sequence via a vapor compression pipeline, wherein the vapor compression cooling unit employs a refrigerant cycle; A forced convection cooling unit, comprising: a liquid cooling plate, a heat exchanger, an evaporator, and a water pump connected by cooling pipes, wherein the forced convection cooling unit uses coolant circulation, and the liquid cooling plate is in close contact with the power module of the charging system; The condenser of the vapor compression cooling unit is located close to the heat exchanger of the vapor compression cooling unit. The vapor compression cooling unit and the forced convection cooling unit also include a fan, which is positioned directly opposite the heat exchanger and the condenser. The fan is used to air-cool the condenser and the heat exchanger. The vapor compression cooling unit and the forced convection cooling unit share an evaporator. The evaporator includes a first flow channel and a second flow channel. The vapor compression pipeline is connected to the first flow channel, and the cooling pipeline is connected to the second flow channel. The evaporator is used to evaporate the refrigerant flowing out of the condenser and to perform convective heat exchange between the coolant in the second flow channel and the refrigerant in the first flow channel. In the forced convection cooling unit, the outlet of the liquid cooling plate is connected to the inlet of the second flow channel of the evaporator through a first one-way valve, the outlet of the second flow channel of the evaporator is connected to the inlet of the liquid cooling plate through the water pump, the outlet of the second flow channel of the evaporator is also connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the second flow channel of the evaporator through a second one-way valve.

2. The cooling system of the charging system according to claim 1, characterized in that, The vapor compression pipeline includes copper pipes.

3. A control method for a cooling system based on the charging system according to claim 1 or 2, characterized in that, Includes the following steps: The temperature of the power module of the charging system is obtained, and when the temperature of the power module reaches the start-up temperature Tsta, the cooling system is controlled to start. Obtain the ambient temperature Tamb, and select the temperature difference ΔT based on the start-up temperature Tsta and the ambient temperature Tamb acquisition mode, where ΔT = Tsta - Tamb; The temperature difference ΔT selected for the mode selection is determined, wherein, If the temperature difference ΔT between the selected modes is greater than the first set temperature K1, then the forced convection cooling unit is activated. If the selected temperature difference ΔT is less than or equal to the first set temperature K1 and greater than or equal to the second set temperature K2, the forced convection cooling unit is started first. After a first preset time, the target temperature difference ΔTt is continuously detected. If the target temperature difference ΔTt is greater than the third set temperature K3, the vapor compression cooling unit is started. Here, K1 > K2, ΔTt = Tout - Ttar, Tout is the liquid outlet temperature of the liquid cooling plate, and Ttar is the target liquid outlet temperature of the liquid cooling plate. If the temperature difference ΔT selected by the mode is less than the second set temperature K2, then the vapor compression cooling unit is started, or the vapor compression cooling unit and the forced convection cooling unit are started simultaneously.

4. The control method for the cooling system of the charging system according to claim 3, characterized in that, Also includes: After the forced convection cooling unit is started, the water pump flow rate and fan speed are adjusted according to the magnitude and trend of the target temperature difference ΔTt. After the vapor compression cooling unit is started, the frequency of the compressor is adjusted according to the magnitude and trend of the target temperature difference ΔTt, and the water pump flow rate and fan speed are adjusted at the same time.

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