A cooling system

Abstract

The application provides a cooling system, comprising a cooling unit with a cooling circulation loop, the cooling unit comprising a cooling circulation assembly, a detection assembly, a switch valve and a controller electrically connected to the detection assembly and the switch valve, the cooling circulation assembly comprising an access device, a collection device, a main heat sink, a pump source, a medium storage tank and a shunt device, at least two secondary branches being provided in parallel between the collection device and the shunt device, the access device being accessed on the at least one secondary branch; wherein the type of the access device comprises a charging gun; when only one secondary branch accesses the charging gun, the secondary branch without the charging gun is provided with the switch valve; when at least two secondary branches access the charging gun, all the secondary branches are provided with the switch valve. Thus, the same cooling system can cool multiple charging guns and the secondary branches with the charging guns are independently operated, so that the cost is greatly saved and the temperature of any charging gun is prevented from being too high or too low, and the normal use of the charging gun is ensured.

Description

TECHNICAL FIELD

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

[0002] For the range anxiety of new energy vehicles, before the energy density of battery packs has a revolutionary breakthrough, shortening the charging time of new energy vehicles can alleviate the anxiety of drivers and passengers more than carrying more batteries to improve the range. Therefore, fast charging, especially super fast charging, has become a trend in the development of the new energy industry.

[0003] In the related art, the charging gun and the charging module of the charging pile use the same cooling system. Due to the large difference in heat generation between the charging gun and the charging module, the inlet and outlet temperature and pressure parameters of the charging gun cannot be controlled within a reasonable range, which easily causes the temperature of the charging gun to be too high or too low, affecting the normal use of the charging gun. On the other hand, one cooling system is provided for one charging gun. Since there is a case where one charging pile has multiple charging guns, multiple cooling systems need to be configured, which is costly. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a cooling system to solve the deficiencies in the related art to some extent.

[0005] To solve the above technical problems, the present application provides a cooling system, comprising a cooling unit with a cooling circulation loop, the cooling unit comprising a cooling circulation assembly, a detection assembly, a switch valve, an access device, and a controller electrically connected to the detection assembly and the switch valve, the cooling circulation assembly comprising a collection device, a main heat sink, a pump source, a medium storage tank, and a distribution device connected in sequence to form a closed circulation loop, at least two secondary branches are provided in parallel between the collection device and the distribution device, the access device is accessed on at least one secondary branch, the detection assembly is used to detect the inlet and outlet temperature and pressure of the secondary branch, and the controller is electrically connected to the pump source and the main heat sink; wherein the type of the access device includes a charging gun, when only one secondary branch accesses the charging gun, the secondary branch of the charging gun is not provided with the switch valve; when at least two secondary branches access the charging gun, all secondary branches are provided with the switch valve.

[0006] Preferably, the type of the access device also includes a secondary heat sink for dissipating heat from a heat generating component, when the secondary heat sink accesses the secondary branch, the secondary heat sink of the corresponding secondary branch and the main heat sink form an air conditioning effect together.

[0007] Preferably, the cooling system is provided with a plurality of cooling units arranged in parallel, and the two converging devices and the two diverging devices in any two of the cooling units are communicated to form two parallel branches, and the switch valve is arranged on each of the parallel branches.

[0008] Preferably, the converging device and the diverging device each have a main interface, a parallel interface and a secondary interface, the secondary interfaces of the converging device and the diverging device are communicated to form a secondary branch, the main radiator is communicated with the main interface of the converging device, the pump source is communicated with the main interface of the diverging device, and the parallel interfaces of the converging devices and the parallel interfaces of the diverging devices in any two of the cooling units are communicated to form the parallel branches.

[0009] Preferably, the detection assembly comprises a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are arranged on the secondary interface.

[0010] Preferably, the cooling cycle assembly further comprises a bottom plate and a side plate fixed to the bottom plate, the main radiator and the pump source are fixed to the bottom plate, the storage medium tank is fixed to the side plate and located on the side of the pump source away from the bottom plate, the converging device and the diverging device are fixed to the end of the storage medium tank away from the pump source, and the storage medium tank is located between the radiator and the side plate.

[0011] Preferably, the storage medium tank comprises a shell having a storage cavity and a filter fixed in the storage cavity, the shell comprises an outer shell having the storage cavity and a cover plate sealing the storage cavity and connected to the outer shell, and the filter has an outer dimension smaller than that of the cover plate.

[0012] Preferably, the main radiator comprises a radiator body having a coil structure and a fan fixed to the radiator body, and the fan is used to drive external air to blow to the coil structure.

[0013] Preferably, the cooling medium of the cooling system comprises any one of a cooling liquid and a cooling gas.

[0014] Preferably, the cooling liquid comprises any one of water, ethylene glycol antifreeze, oil and electronic fluorinated liquid.

[0015] Compared with the prior art, the cooling system has the beneficial effects that: when only one secondary branch is connected to the charging gun, the secondary branch without the charging gun is provided with a switch valve; when at least two secondary branches are connected to the charging gun, all the secondary branches are provided with switch valves, so that the opening and closing of the switch valves can be controlled to control the independent operation of each secondary branch where the charging gun is located, that is, the same cooling system can also be individually adjusted for each secondary branch where the charging gun is located when cooling multiple charging guns. By forming multiple branches through the collection device and the distribution device, one cooling system can cool multiple charging guns at the same time, greatly saving the cost; at the same time, by controlling the independent operation of the branch where the charging gun is located through the switch valve, the inlet and outlet temperature and pressure parameters of all the charging guns can be controlled in a reasonable range in time, so that the temperature of any charging gun is prevented from being too high or too low, and the normal use of the charging gun is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 is a principle diagram of a cooling system of an embodiment of the present application which is provided with only one cooling unit;

[0018] Figure 2 is a principle diagram of a cooling system of an embodiment of the present application which is provided with two cooling units arranged in parallel;

[0019] Figure 3 is a structure diagram of a cooling circulating assembly in a cooling system of an embodiment of the present application;

[0020] Figure 4 is a rear view of a cooling circulating assembly in a cooling system of an embodiment of the present application;

[0021] Figure 5 is a structure diagram of a collection device and a distribution device in a cooling system of an embodiment of the present application;

[0022] Figure 6 is a structure diagram of a heat dissipation body in a cooling system of an embodiment of the present application;

[0023] Figure 7 is a front view of a main heat radiator in a cooling system of an embodiment of the present application;

[0024] Figure 8 is a partial structure explosion diagram of a medium storage tank in a cooling system of an embodiment of the present application.

[0025] In the drawings, the same or similar reference signs indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary, and are intended to explain the present application, and are not to be understood as limiting the present application, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of the present application. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary, and are intended to explain the present application, and are not to be understood as limiting the present application, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second" are only 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 with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0029] Embodiments:

[0030] Please refer to Figures 1 to 8The embodiment of the present application provides a cooling system, which comprises a cooling unit with a cooling circulation loop, the cooling unit comprising a cooling circulation assembly, a detection assembly 1, a switch valve 2, an access device, and a controller electrically connected to the detection assembly 1 and the switch valve 2, the cooling circulation assembly comprising a collecting device 3, a main radiator 4, a pump source 5, a medium storage box 10, and a distribution device 6 connected in sequence to form a closed circulation loop, at least two secondary branches are arranged in parallel between the collecting device 3 and the distribution device 6, the access device is accessed on at least one secondary branch, the detection assembly 1 is used for detecting the inlet and outlet temperature and pressure of the secondary branch, and the controller is electrically connected to the pump source 5 and the main radiator 4; wherein the type of the access device comprises a charging gun, when only one secondary branch accesses the charging gun, the secondary branch without the charging gun is provided with the switch valve 2; when at least two secondary branches access the charging gun, all the secondary branches are provided with the switch valve 2.

[0031] It should be understood that the control assembly is used for adjusting the operating parameters of the main radiator 4 and the pump source 5 according to the detection result of the detection assembly 1, and is used for controlling the opening and closing of the switch valve 2. Since when only one secondary branch accesses the charging gun, the secondary branch without the charging gun is provided with the switch valve 2; when at least two secondary branches access the charging gun, all the secondary branches are provided with the switch valve 2, so that the secondary operation of the secondary branch where each charging gun is located can be controlled by controlling the opening and closing of the switch valve 2, that is, the same cooling system can also be individually adjusted when cooling multiple charging guns. By forming multiple branches through the collecting device 3 and the distribution device 6, one cooling system can simultaneously cool multiple charging guns, greatly saving the cost; at the same time, by controlling the separate operation of the branch where the charging gun is located through the switch valve 2, the inlet and outlet temperature and pressure and other parameters of all the charging guns can be controlled in a reasonable range in time, so that the temperature of any charging gun is prevented from being too high or too low, and the normal use of the charging gun is ensured.

[0032] It should be pointed out that in the related technical solutions, the pipe flow radius of the charging gun cooling pipe is very small, and the cooling pipe is relatively long. When the length of the charging gun cooling pipe is greater than a certain length (such as 1 m, 2 m and 3 m, etc.), the water resistance of the loop where the charging gun is located is greater than that of the loop where the charging module is located. At this time, if the charging gun still shares one cooling system with the charging module, the length of the charging gun cooling pipe will be greatly limited, thereby limiting the length of the charging gun cable and shortening the distance between the new energy vehicle and the charging pile. Therefore, the pump source 5 corresponding to the charging gun must provide sufficient lift to overcome the resistance loss generated by the charging gun cooling pipe, so as to ensure the length of the charging gun cable, so that the new energy vehicle can maintain a sufficient distance from the charging pile when charging, and can charge more vehicles in the parking lot.

[0033] Please refer to Figure 1 , Figure 3 and Figure 5In one embodiment, the type of the access device also includes a secondary heat sink for dissipating heat from the heat-generating component, when the secondary heat sink is accessed in the secondary branch, the secondary heat sink corresponding to the secondary branch and the main heat sink jointly form an air conditioning effect, that is, the heat absorbed by the secondary heat sink is transferred to the main heat sink through the cooling liquid, and finally the main heat sink dissipates heat to the surrounding environment. Specifically, the heat-generating component can be a shunt, a fuse, etc. fixed in the electric control cabinet of the charging pile, the secondary heat sink is equivalent to the indoor unit of the air conditioner, and the main heat sink 4 is equivalent to the outdoor unit of the air conditioner, so that the secondary heat sink can reduce the temperature in the electric control cabinet, thereby cooling the heat-generating component, which is conducive to ensuring the normal work of the charging pile, thereby ensuring the normal work of the charging gun. It should be understood that whether the secondary heat sink is accessed in the secondary branch is set according to actual requirements, and when the detection assembly 1 detects that the temperature of the heat-generating component is greater than the set temperature, the secondary heat sink in the secondary branch switch valve 2 is opened; when the temperature detected by the detection assembly 1 is less than the set temperature, the secondary heat sink in the secondary branch switch valve 2 is closed; wherein the set temperature is a protection temperature set according to the characteristics of the heat-generating component.

[0034] It should be noted that when only one secondary branch accesses the charging gun, the secondary branch without the charging gun can access the secondary heat sink, or the secondary branch can be directly plugged; for example, one of the two secondary branches accesses the charging gun, and the other secondary branch accesses the secondary heat sink and is provided with a switch valve 2, at this time, the opening and closing of the switch valve 2 can be controlled to control the operating parameters of the secondary branch where the charging gun is located; one of the three secondary branches accesses the charging gun, one of the secondary branches accesses the secondary heat sink and is provided with a switch valve 2, and one of the secondary branches is plugged by being provided with a normally closed switch valve 2. When at least two secondary branches access the charging gun, all secondary branches are provided with a switch valve 2; for example, both of the two secondary branches access the charging gun and are provided with a switch valve 2, thereby realizing control of each branch where the charging gun is located.

[0035] Please refer to Figure 2 In one embodiment, the cooling system is provided with a plurality of cooling units arranged in parallel, and the two converging devices 3 and the two diverging devices 6 in any two cooling units are communicated to form two parallel branches, and each parallel branch is provided with a switch valve 2. By controlling the opening and closing of the switch valve 2, the two cooling units can be arranged in parallel or independently, and the parallel arrangement of the two cooling units can further improve the cooling effect of the cooling system.

[0036] Please refer to Figure 2 , Figure 3 and Figure 5In one embodiment, the collecting device 3 and the distributing device 6 are both provided with a main interface 7, a parallel interface 8 and a secondary interface 9, the secondary interface 9 of the collecting device 3 and the secondary interface 9 of the distributing device 6 are communicated to form a secondary branch, the main radiator 4 is communicated with the main interface 7 of the collecting device 3, the pump source 5 is communicated with the main interface 7 of the distributing device 6, and the parallel interfaces 8 of any two collecting devices 3 and the parallel interfaces 8 of any two distributing devices 6 are communicated to form a parallel branch. Specifically, the collecting device 3 and the distributing device 6 are both water distributors, and the collecting device 3 and the distributing device 6 have the same specifications, which can not only reduce the production cost, but also reduce the probability of installation error; the main interface 7 and the parallel interface 8 can be screw interfaces, specifically 1 / 2G screw interfaces, and the secondary interface 9 can be a screw interface, specifically a 1 / 4G screw interface, that is, the aperture of the secondary interface 9 is smaller than the apertures of the main interface 7 and the parallel interface 8.

[0037] It should be noted that, since there are different forms of charging guns in the market, the charging gun cooling pipe has one inlet and one outlet, or one inlet and two outlets, or two inlets and two outlets. The water distributor is provided with a main interface 7, a parallel interface 8 and four secondary interfaces 9 on the front and side surfaces, when the secondary interfaces 9 are not enough and the parallel interface 8 is idle, the parallel interface 8 can be converted into a secondary interface 9 through a threaded adapter, which can not only connect more detection components 1, but also connect more charging guns or secondary radiators.

[0038] Please refer to Figure 3 , Figure 4 and Figure 5 In one embodiment, the detection component 1 includes a pressure sensor 11 and a temperature sensor 12, and the pressure sensor 11 and the temperature sensor 12 are both arranged on the secondary interface 9. Specifically, the pressure sensor 11 and the temperature sensor 12 are arranged on two secondary interfaces 9, that is, the pressure sensor 11 and the temperature sensor 12 detect the inlet and outlet pressures and temperatures of the secondary branch where the charging gun is located and the inlet and outlet pressures and temperatures of the secondary branch where the secondary radiator is located in the secondary interface 9, the controller calculates the inlet and outlet pressure differences and temperature differences of the secondary branch where the charging gun is located and the inlet and outlet pressure differences and temperature differences of the secondary branch where the secondary radiator is located, and then adjusts the operating parameters of the main radiator 4 and the pump source 5 to the best state according to the predetermined program. According to actual needs, the secondary interface 9 can be provided with other numbers, such as four, five and six, etc.

[0039] It should be noted that, when the cooling system is provided with one cooling unit and only one secondary branch is connected to the charging gun, the cooling system is in a single-gun working mode; when the cooling system is provided with one cooling unit and multiple secondary branches are connected to the charging gun, the cooling system is in a multi-gun working mode; when the cooling system is provided with multiple cooling units, the cooling system is in a cooling unit parallel working mode.

[0040] In the single-gun working mode, when the controller receives the fast-charging gun instruction, the controller controls the pump source 5 to run at a certain initial speed for 15 seconds according to a predetermined program, and then the detection assembly 1 detects the temperature and pressure of the inlet and outlet of the sub-branch where the charging gun is located, and transmits the detection results to the controller; the controller receives the detection results and calculates the inlet and outlet temperature difference and the inlet and outlet pressure difference, and compares them with the calibration value, so as to determine the optimal operating parameters of the main heat dissipator 4 and the pump source 5; wherein the calibration value refers to the inlet and outlet temperature difference and the inlet and outlet pressure difference tested by the charging gun in various working modes in the laboratory. It should be understood that a sub-heat dissipator can be connected in the sub-branch according to actual needs at this time.

[0041] In the multi-gun working mode, when the controller receives the fast-charging gun instruction, the controller controls the pump source 5 to run at a certain initial speed for 15 seconds according to a predetermined program, and then the detection assembly 1 detects the temperature and pressure of the inlet and outlet of the sub-branch where the charging gun is located, and transmits the detection results to the controller; the controller receives the detection results and calculates the inlet and outlet temperature difference and the inlet and outlet pressure difference, and compares them with the calibration value, so as to determine the optimal operating parameters of the main heat dissipator 4 and the pump source 5. It should be understood that when the sub-branch is connected to the sub-heat dissipator, since the models and specifications of the charging guns are the same, the water resistance is completely consistent, and the heating power of the charging gun and the water resistance of the sub-branch where the charging gun is located are much greater than the heating power of the heating components and the water resistance of the sub-branch where the sub-heat dissipator is located, so selecting any charging gun as a reference can meet the heat dissipation requirements of any sub-branch.

[0042] In addition, when only one charging gun is charging and other charging guns are idle, the idle charging gun does not receive the charging instruction, and the switch valve 2 of the sub-branch where the idle charging gun is located is in a closed state, so the cooling medium does not flow through the sub-branch. When the sub-branch is connected to the sub-heat dissipator, whether one charging gun is charging or multiple charging guns are charging, or there is no charging in the standby state, as long as the temperature of the sub-heat dissipator is greater than the set temperature, the switch valve 2 of the sub-branch where the sub-heat dissipator is located is switched from the closed state to the open state; when the temperature of the sub-heat dissipator is less than the set temperature, the switch valve 2 of the sub-branch where the sub-heat dissipator is located is switched from the open state to the closed state.

[0043] In the parallel working mode of the cooling unit, multiple cooling units in parallel can improve the cooling effect of the cooling system. Assuming that a cooling unit can only maintain two charging guns 500A*10 minutes of fast charging, if three charging guns are connected for fast charging, the charging current must be reduced or the fast charging time must be shortened, and if two cooling units are connected in parallel, the effect of 1+1>2 can be achieved.

[0044] First, when the charging pile is not full, users often prefer to park on the side where parking is more convenient. At this time, the idle cooling unit due to the inconvenience of parking can be utilized to meet the fast charging needs of more vehicles. Second, the market's fast charging generally only requires the first 10 minutes, for example, it requires charging from 20% to 80% within 10 minutes. After 10 minutes, the input power is allowed to be reduced. If two charging piles use independent charging methods, only four charging guns can maintain 500A*10 minutes of fast charging. If the two liquid cooling units in the two charging piles are connected in parallel, five charging guns can maintain 500A*10 minutes of fast charging. Because the pace of vehicle fast charging is not consistent, when the fifth vehicle starts fast charging, the first vehicle's 10-minute fast charging is over and the power is reduced to slow charging. At this time, according to the predetermined program, the switch valve 2 of the sub-branch where the charging gun corresponding to the first vehicle is located is closed, and because the charging power is small, the charging gun does not need to be cooled by the cooling liquid to maintain the remaining charging demand. If one cooling unit can meet the cooling demand, according to the predetermined program, the switch valve 2 between the other parallel cooling unit is closed to prevent reverse flow.

[0045] Please refer to Figure 3 and Figure 4 In one embodiment, the cooling circulation assembly further comprises a bottom plate 20 and a side plate 30 fixed to the plate surface of the bottom plate 20, the main heat sink 4 and the pump source 5 are fixed to the bottom plate 20, the storage medium tank 10 is fixed to the side plate 30 and located on the side of the pump source 5 away from the bottom plate 20, the collection device 3 and the shunt device 6 are fixed to the end of the storage medium tank 10 away from the pump source 5, and the storage medium tank 10 is located between the heat sink and the side plate 30, so that the cooling circulation assembly has a smaller size, which is beneficial to meet the miniaturization of the charging pile.

[0046] It should be noted that in order to meet the miniaturization requirement of the charging pile, the cooling circulation assembly has a smaller size (for example, the height is less than 400mm, 500mm and 600mm, etc., and the width is less than 300mm, 400mm and 500mm, etc.), which results in insufficient windward surface of the main heat sink 4, limiting the cooling capacity of the cooling system. Therefore, when the number of heat loads such as charging guns provided on the cooling unit is too large, even if the main heat sink 4 is at maximum power, it cannot meet the cooling demand. At this time, multiple cooling units can be connected in parallel to meet the cooling demand.

[0047] Please refer to Figure 3 , Figure 4 and Figure 8In one embodiment, the storage medium box 10 comprises a housing 101 with a storage cavity 103 and a filter fixed in the storage cavity 103, the housing 101 comprises an outer shell with the storage cavity 103 and a cover plate 102 connected to the outer shell and sealing the storage cavity 103, and the filter has a size smaller than that of the cover plate 102. Specifically, the cover plate 102 is a top cover, and when the cover plate 102 is opened, the filter can freely enter and exit from the top of the storage medium box 10; a sealing strip is installed between the cover plate 102 and the outer shell, and the cover plate 102 is fixed to the outer shell by screws. The filter can be a filter cartridge, and the pore size of the filter cartridge is selected according to the minimum particle diameter allowed to pass through by the radiator, the pump source 5, etc., and the external volume of the filter can occupy the entire storage cavity 103, facilitating the filtration of the cooling medium.

[0048] It should be noted that the welding slag and other impurities generated during the welding process of the storage medium box 10 will fall into the bottom of the box, and since the opening of the storage medium box 10 is provided, it is convenient to clean the welding slag, and it is also convenient to check the welding process and passivation process of the storage medium box 10. Since the filter is built-in in the storage medium box 10, it is not only more beautiful, but also can expand the flow area of the filter cartridge mesh, and reduce the water resistance; and when replacing or cleaning the filter, the cooling liquid remaining in the filter will fall into the storage medium box 10, without worrying about the cooling liquid spilling outside the cooling unit during replacement, polluting the cooling unit.

[0049] Please refer to Figure 3 , Figure 6 and Figure 7 In one embodiment, the main radiator 4 comprises a radiator body 41 with a coil structure and a fan 42 fixed to the radiator body 41, and the fan 42 is used to drive the air outside to blow to the coil structure, so that the cooling medium flowing through the coil starts the fan 42 to force heat dissipation.

[0050] In one embodiment, the cooling medium of the cooling system comprises any one of a cooling liquid and a cooling gas, i.e. the cooling system can select liquid cooling or air cooling. The cooling liquid comprises any one of ethylene glycol antifreeze, oil and electronic fluorinated liquid. When the cooling medium is a cooling liquid, the working principle of the cooling system is that the high-temperature and high-heat cooling liquid in the charging gun flows into the main radiator 4 through the collecting device 3, the cooling liquid cooled by the main radiator 4 flows into the storage medium box 10, and then is pressurized by the pump source 5 and pumped into the shunt device 6, and then flows into the sub-branch where the charging gun is located after being distributed by the shunt device 6, the cooling liquid carries away the heat of the cable and the gun head of the charging gun, and the cycle is repeated to complete the cooling of the charging gun. Moreover, when the cooling system has only one cooling unit, the on-off valve 2 must be arranged between the shunt device 6 and the access device to avoid backflow of the cooling liquid.

[0051] Specifically, when oil is selected as the cooling medium, the water resistance will increase due to too much viscosity at low temperature, even if the rotation speed of the pump source 5 is opened to the maximum, but the flow of the cooling liquid is very small, that is, in the case of low ambient temperature, the charging gun cannot complete the fast charging; and the maximum pressure of the pump source 5 will exceed the allowable working pressure of the charging gun cooling pipe, for example, greater than 1MPA, which not only shortens the working life of the charging gun, but also brings the risk of pipe explosion. Therefore, the rotation speed of the pump source 5 is first adjusted to a lower speed, and then the charging power of the charging gun is reduced, the cooling medium in the charging gun is heated to a certain temperature by the self-heating of the charging gun, and the flow of the cooling medium is increased to a certain flow, and then the charging gun starts to fast charge, thereby forming a low-temperature preheating working mode. If there is no car to charge for a long time under low temperature, the charging pile will be in standby state for a long time, and the pump source 5 is started every 15 minutes or half an hour to prevent the oil temperature from being lowered further.

[0052] In the low-temperature preheating working mode, the switch valve 2 of the sub-branch where the sub-radiator is located is opened, and since the sub-branch pipeline is short, the pipe flow radius inside the coil of the sub-radiator is greater than the pipe flow radius inside the charging gun cooling pipe, and the coil inside the sub-radiator can adopt a parallel mode, so that the water resistance of the sub-branch is smaller than the water resistance of the sub-branch where the charging gun is located. After the switch valve 2 is opened, the inlet and outlet of the charging gun cooling pipe are short-circuited, and the overall water resistance of the sub-branch where the charging gun is located is much smaller than before the switch valve 2 is opened, so that the pump source 5 can operate at a higher speed, even at the maximum speed, and the maximum pressure of the pump source 5 is within a reasonable range. This design not only reduces the risk of pipe explosion, but also fully utilizes the self-heating of the pump source 5 to quickly raise the temperature of the cooling medium, and brings the heat generated by the heating components into the cooling system, which will make the temperature of the cooling medium rise faster.

[0053] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling system comprising a cooling unit having a cooling circulation loop, characterized by, The cooling unit comprises a cooling circulation assembly, a detection assembly, a switch valve, an access device, and a controller electrically connected to the detection assembly and the switch valve, the cooling circulation assembly comprises a collection device, a main radiator, a pump source, a medium storage tank, and a distribution device connected in a closed circulation loop, at least two sub-branches are arranged in parallel between the collection device and the distribution device, the access device is accessed on at least one of the sub-branches, the detection assembly is used to detect the inlet and outlet temperature and pressure of the sub-branch, and the controller is electrically connected to the pump source and the main radiator. The type of the access device further comprises a sub-radiator for dissipating heat of a heat-generating component, when the sub-radiator is accessed on the sub-branch, the sub-radiator of the corresponding sub-branch and the main radiator jointly form an air conditioning effect. The cooling system is provided with a plurality of cooling units arranged in parallel, and two collection devices and two distribution devices in any two cooling units are communicated to form two parallel branches, and each of the parallel branches is provided with the switch valve. The type of the access device comprises a charging gun, when only one sub-branch accesses the charging gun, the sub-branch without the charging gun is provided with the switch valve, and when at least two sub-branches access the charging gun, all the sub-branches are provided with the switch valve. The controller is used to open the switch valve of the sub-branch where the sub-radiator is located in a low-temperature preheating working mode when a plurality of cooling units are arranged in parallel, the inner pipe flow circulation radius of the coil internal pipe of the sub-radiator is greater than the inner pipe flow circulation radius of the cooling pipe of the charging gun, the coil internal pipe of the sub-radiator adopts a parallel mode, so that the water resistance of the sub-branch is less than the water resistance of the sub-branch where the charging gun is located, the sub-radiator absorbs the heat generated by the heat-generating component and brings the heat into the cooling system, and the cooling pipe inlet and outlet of the charging gun are short-circuited.

2. The cooling system of claim 1, wherein, The collection device and the distribution device each have a main interface, a parallel interface, and a sub-interface, the sub-interface of the collection device and the sub-interface of the distribution device are communicated to form a sub-branch, the main radiator communicates with the main interface of the collection device, the pump source communicates with the main interface of the distribution device, and the parallel interfaces of the two collection devices and the parallel interfaces of the two distribution devices in any two cooling units are communicated to form the parallel branch.

3. The cooling system of claim 2, wherein, The detection assembly comprises a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are arranged on the sub-interface.

4. The cooling system of claim 1, wherein, The cooling circulation assembly further comprises a bottom plate and a side plate fixed to the plate surface of the bottom plate, the main radiator and the pump source are fixed to the bottom plate, the medium storage tank is fixed to the side plate and located on the side of the pump source away from the bottom plate, the collection device and the distribution device are fixed to the end of the medium storage tank away from the pump source, and the medium storage tank is located between the radiator and the side plate.

5. The cooling system of claim 1, wherein, The storage medium box comprises a housing with a storage cavity and a filter fixed in the storage cavity, the housing comprises an outer shell with the storage cavity and a cover plate connected to the outer shell and sealing the storage cavity, and the filter has a size smaller than that of the cover plate.

6. The cooling system of claim 1, wherein, The main radiator comprises a radiator body with a coil structure and a fan fixed to the radiator body, and the fan is used to drive external air to blow to the coil structure.

7. The cooling system of claim 1, wherein, The cooling medium of the cooling system comprises any one of a cooling liquid and a cooling gas.

8. The cooling system of claim 7, wherein, The cooling liquid comprises any one of water, ethylene glycol antifreeze, oil and electronic fluorinated liquid.

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